From fafb0aa69f0aa4274f75b5e95e3cc2f5cbdaec95 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Andr=C3=A9=20Borchert?= Date: Sun, 23 Aug 2026 16:44:41 +0700 Subject: [PATCH 01/16] Cover persistence and fuzzing in CI, and repair the aggregate gate Three separate gaps, all of which let real problems sit unnoticed. qemu-persistence-reboot was never in CI. It boots twice against one volume and requires the second boot to reload what the first wrote, and it is the only thing covering durability across a restart -- which is exactly how a persistence subsystem writing to a snapshot-backed device went unnoticed. It now runs on every push. parser-fuzz was never in CI either, and its runner reset the corpus on every invocation, so each campaign relearned the same shallow coverage from a single seed. The corpus is merged rather than reset now, crashes land where CI collects them, and a bounded campaign runs per push with the corpus cached between runs. The seed corpora are replaced with the coverage-unique inputs from a sustained local campaign: 600 seconds per target across three workers under ASan and UBSan, then minimised with -merge=1. ssh-packet grew from 1 seed to 19, dns to 202, sftp to 260. The campaign found no crashes, no leaks and no undefined behaviour in the SSH binary packet layer, the DNS/DNSSEC response path or the SFTP request decoder -- each of them reachable before authentication. Core OS Aggregate RC had three defects of its own, none in the code it tests: - The NVMe gate asked QEMU for a virt machine "msi" property that only newer releases have. On the CI QEMU the aarch64 guest refused to start with "Property 'virt-8.2-machine.msi' not found", so the run produced no NVMe evidence at all. The launcher now asks the binary what it supports and falls back to its=on alone, which routes MSI through the ITS regardless. - The SMMU gate required "faults=1". That counter is cumulative across the whole SMMU, and unrelated streams raise C_BAD_STE before the test device runs, so the total is whatever the boot happened to reach -- it was 9 locally. The assertion now checks the outcome and that at least one fault was recorded, without pinning an exact running total. - The aggregate required "userspace DNS resolve/cache path passed", wording that only exists in the non-test build. The aggregate boots the XAIOS_BOOT_TEST_APPS image, where nettest emits the fixture wording, so that marker could never appear. It also expected "AArch64/x86_64" where the gate prints the architecture names lowercase. Verified: the SMMU and NVMe gates pass locally, and the ABI and documentation contracts pass. Co-Authored-By: Claude Opus 5 --- .github/workflows/ci.yml | 66 ++++++++++++++++++ scripts/run-qemu-aarch64.sh | 28 +++++++- .../0832a9a9ac5086bc9af775caa5170eba07c02d1b | 1 + .../08c421258fa435d5cee5f0a241472e1a66e2421b | Bin 0 -> 418 bytes .../0973198e06c44aad20a413e134bd7538a6989638 | 1 + .../0b013a0c91bd4804212acd07fc81d46830381344 | Bin 0 -> 13 bytes .../0c3da521fc1eeeb7b105accf96f5c427dfca3dc0 | Bin 0 -> 118 bytes .../0f30339a46eba6cd2ddd3d07a5131f01ed939687 | 1 + .../109a3c99f744fc841ebf337a890bc7bd7c9652a9 | Bin 0 -> 201 bytes .../10c9a0c64d26dc0103956a51c4d32be4e1f40997 | Bin 0 -> 285 bytes .../111c1e4415defd5209ba7ebef3e74c1beb56ccc0 | Bin 0 -> 143 bytes .../115d300d95e9362933f252a6228da2d841303d3d | Bin 0 -> 158 bytes .../122435e3d0c83f1be4ff2d6878ccff5e88e4fcb8 | 1 + .../13b859b2cf7e59ae115fb4b84e4c7007cadde369 | Bin 0 -> 37 bytes .../13eca931b5a402bb1cefc17c04f0417d6a8b4b95 | Bin 0 -> 5 bytes .../1580bf67d44f74b1da01786a7baf00e99ec04c57 | Bin 0 -> 125 bytes 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.../051edbbd23ea63081b6746046b10404aa914315c | Bin 0 -> 18 bytes .../05bc52029a86abf8001ae6c93fe28e4b8744ebe8 | Bin 0 -> 13 bytes .../060d7272e2116cc8b2f687894f9652d7f9408522 | Bin 0 -> 22 bytes .../0624354256e38adfd478a2e7b2da11a8d9df4da2 | Bin 0 -> 33 bytes .../067d5096f219c64b53bb1c7d5e3754285b565a47 | 1 + .../0735683cd44fae1e933edec1b1f083982addc12f | Bin 0 -> 10 bytes .../0768c01f83c69795939e82659982782f5505edbc | Bin 0 -> 21 bytes .../0c61e54e2cd868a4b657a606f2bbcb5073c26974 | Bin 0 -> 140 bytes .../0c8786079d1c824cc8b5a1fe8ed6c75b1ee85c04 | Bin 0 -> 128 bytes .../0c89e2aa8eafa6e0c738a2bc3270e9edd97d3631 | Bin 0 -> 12 bytes .../0eeae9ce7f6f84ebbbe5a148260bfe60997cdd73 | Bin 0 -> 5 bytes .../0f20fa243c75aeec4d60292be7483382487f9c3a | Bin 0 -> 16 bytes .../10d5a39837ec84fc825176bc4bcb1198ff01521f | Bin 0 -> 10 bytes .../11b07148a611b9dffb8ce604bcb0833b67f63dc0 | Bin 0 -> 25 bytes .../11f4de6b8b45cf8051b1d17fa4cde9ad935cea41 | 1 + .../16f8437e89e0ee4d90048244ddaed2805f03cae9 | Bin 0 -> 135 bytes .../186e680da206f48c0874803fdef3d144a40ed63d | Bin 0 -> 14 bytes .../1893370551ef88787ba27a3d08becb71b6825b0d | Bin 0 -> 44 bytes .../196f6abf1b916a45ce3b4463436f093d23535b81 | Bin 0 -> 41 bytes .../1a6f75f517158b28073cc22457c6442f4f8f3912 | Bin 0 -> 18 bytes .../1b6453892473a467d07372d45eb05abc2031647a | 1 + .../1b9adac07eac275395e8feb8e29b0ecd2fa0d190 | Bin 0 -> 14 bytes .../1bd29f695a08d119ab65506fb935c438d7d56b7b | Bin 0 -> 133 bytes .../1e32e3c360501a0ede378bc45a24420dc2e53fba | 1 + .../1eb6fb731869ac526e54678fdddad0c87ff28c37 | Bin 0 -> 12 bytes .../205f5f5a581f65e06464533e5c4624187f3e44fc | Bin 0 -> 11 bytes .../20998d1d6d26f915244912104ef5b722c56824aa | Bin 0 -> 9 bytes .../21aa2b6b2f622c1e2069956b3a247850c187a110 | Bin 0 -> 17 bytes .../21f1e9ccf3eede7a7390eca0ae08bee3b7ebb9bc | 1 + .../22d54c34f70e32cd83604d335d38e2efea6c7daf | Bin 0 -> 17 bytes .../22f7608a8e55e0f9a9b3df3c18bdf66c70ee6573 | Bin 0 -> 18 bytes .../230e89eb169c7e6a158ebd5fcab8fdd1dc1a1a77 | Bin 0 -> 25 bytes .../2341042633e3f89604a2b27bde9c4ca53caa4f32 | 1 + .../23d4202b430edff9b192a2b8121ed10949d05fe3 | Bin 0 -> 18 bytes .../2496922eeef997ae254b76045acecfcaadf30492 | Bin 0 -> 26 bytes .../27f32be7268a1c483fc2370df26dc838349f6d63 | Bin 0 -> 22 bytes .../27fa040b2b626622e41539eef593cbbb76ea8da3 | Bin 0 -> 17 bytes .../29647b5a05100dea70b7ce870dc69e039da262ff | Bin 0 -> 126 bytes .../2967bed3f6077aaf4f335712b4155dd557dec985 | Bin 0 -> 5 bytes .../2a32c5807d96e50f1825fc3398a139dddba0b22d | Bin 0 -> 20 bytes .../2ad40adb6e6e07c9a47469c6e9b0a161c36c973a | Bin 0 -> 141 bytes .../2b0ac5f49662c27ed49aafeeef1a0f45c5948f4e | Bin 0 -> 12 bytes .../2b7082e93543d17a3cd5c0a56f65c4bfc14d1443 | Bin 0 -> 17 bytes .../2bc778fc9d30ae0884e27f9604adba3f9704c98c | Bin 0 -> 35 bytes .../2d0134ed3b9de132c720fe697b532b4c232ff9fe | 1 + .../2ded9cd86f5015263fd8954e2b0e2007366238bc | Bin 0 -> 18 bytes .../2e1272706b911cf8b0056f9ad7717413df85182e | Bin 0 -> 10 bytes .../2eee0e8d607ab9cc6bb9a8f4b7ec9b8a60a8cbe3 | Bin 0 -> 13 bytes .../2f1ba53b15e6ec7532358b55d9d1b06a42dbcda1 | Bin 0 -> 127 bytes .../2fb946fd8fad5d57b31457b899536856e725f6cd | Bin 0 -> 10 bytes .../2fc50e3d3342d4610a4a08a70c4a013ceab2f874 | Bin 0 -> 9 bytes .../300f761b6d19640e91db829d1cbfa8b025914ca4 | Bin 0 -> 11 bytes .../30c84d37575a4521c145b2b60a7e4202cd2f4f97 | Bin 0 -> 25 bytes .../30d88c894380b4ee74353d60904560c7bfe26c6c | Bin 0 -> 14 bytes .../31caece29debee6c1b4e4217cc0b252ad362efd1 | Bin 0 -> 43 bytes .../320355ced694aa69924f6bb82e7b74f420303fd9 | 1 + .../3507d854de2458f33376dbd727071bb7ee93bf9b | Bin 0 -> 12 bytes .../35b02ec6b51d5f7fcc99bf76ccd617d0eb323ce2 | 1 + .../37cce52e89d666350991820485c6aec4bdbcd4a9 | Bin 0 -> 9 bytes .../3857110167557685286d8a979724a09f5b098211 | Bin 0 -> 14 bytes .../38994f4163e46aa52d97af1075f8dcc605ce5ac1 | Bin 0 -> 50 bytes .../39594f602b0345c3cf13b1271c8470f94d821061 | Bin 0 -> 18 bytes .../3a2092aff2749c4a939e475d2a31b8bb08a4aeed | Bin 0 -> 26 bytes .../3bf260084777d0d1947ac40a33328902350459c8 | Bin 0 -> 9 bytes .../3bf4364543031a14f4d35c9f6a58e6e488aa4d55 | Bin 0 -> 5 bytes .../3cf07f46232ec39af15a3ea28bef7f953da1ded7 | Bin 0 -> 16 bytes .../3d6f4a63fbc1d2b6517803f2c0e02643daca26c1 | Bin 0 -> 13 bytes .../3fe348064472fa143c9ffbbd22418d58d72c6c81 | Bin 0 -> 18 bytes .../4059c8c6e0d6d7cc498d7bb6db655e1fc588f5a9 | Bin 0 -> 21 bytes .../40c05fd0c26bcc6469fc95989538d78a38949b4c | Bin 0 -> 42 bytes .../40cca6b80f2590bf0c8ee79930f2306e9a5f488b | Bin 0 -> 11 bytes .../425e39635cb3ff6c746e049040e32b8ae91c3f98 | Bin 0 -> 99 bytes .../4309aa279959612211076df160c24f405f6fb916 | Bin 0 -> 265 bytes .../43a4cadad6ad815b460922d2f209637a9b41cb38 | Bin 0 -> 13 bytes .../4480d7e57896f5b6ce18f9782501b03fc44605f5 | Bin 0 -> 25 bytes .../450a780e731fee1d4a381f350fd397d5215d4305 | Bin 0 -> 18 bytes .../455f99affc8426be3e50c7f1c7fea628d509b640 | Bin 0 -> 18 bytes .../464f7563905b70a37713eaea50178dfd1a942b65 | Bin 0 -> 9 bytes .../47f7acd9da7ef2e518eb9614900efed19916d4f7 | Bin 0 -> 50 bytes .../483a2db6e9aa2f4ccc36a9948d840369ab335c80 | Bin 0 -> 12 bytes .../4b370760968ddceb194aca1da46987c36e8040fb | Bin 0 -> 18 bytes .../4c2b04f376725a3726c2d1fe34eae9b721c7ad67 | Bin 0 -> 273 bytes .../4cb9cb8b755e22d245531fddc8453dc9c61381fa | Bin 0 -> 18 bytes .../4dffb01f63b278856e9871f736b9c27b1260a31f | Bin 0 -> 25 bytes .../4fb430791a89b8a5e295171d8a718c44dcb55993 | Bin 0 -> 12 bytes .../502fb1ce4d60456f1ff463b96176e957f6c2d192 | Bin 0 -> 11 bytes .../5034c72661c63e98573503a83e5bd7b12d2520af | Bin 0 -> 21 bytes .../512a6a0c167e1e35a3cf1e96290168bd7677c8c8 | Bin 0 -> 269 bytes .../51f5147b369c9a95c1181486b32dbe5ee6491ab8 | Bin 0 -> 17 bytes .../524e8766c2f23ed7877940d7734e317e43f86015 | Bin 0 -> 10 bytes .../52edfcf1aa24d39c47a2e7fc1dab7a06736f82dd | Bin 0 -> 26 bytes .../53d1460e7dfa78c97dbea6a9807abfd7c4dafaf9 | Bin 0 -> 41 bytes .../541641c126e5f3d4586c73ffee8c787895dc1922 | Bin 0 -> 25 bytes .../545d0e901e918a1aad109d422a59836e8c58c255 | Bin 0 -> 17 bytes .../5516dca960817d2f7a24add6f069f3610d9f0b29 | Bin 0 -> 25 bytes .../551d27015c720a5e2ed7c046f835d9566890db78 | Bin 0 -> 12 bytes .../5697c9c17e20eea18f42e2cf47e383f6900e3bd8 | Bin 0 -> 265 bytes .../56a91971a81f758a80f8985e1a01e724c393b053 | Bin 0 -> 25 bytes .../577968610a60f563926e957a73abb65b3538152e | Bin 0 -> 18 bytes .../578f936354c54e17ba180ed7fe218ce25f050a79 | Bin 0 -> 40 bytes .../58356fbaf0a833a4e4b89e7638f6ce05a3f41aae | Bin 0 -> 122 bytes .../586098392a60a8009627765d4fec39ec85435d14 | Bin 0 -> 14 bytes .../59c8d38ec35ad55b438e34bbbf1af35dd9439e7c | 1 + .../5b1c7ac5562ed91dbc88858c9681f92ea91a9bf0 | Bin 0 -> 9 bytes .../5bbdab3597adec6ee21aa3a7b25de96f394c58df | Bin 0 -> 12 bytes .../5ccd1aa8868474fb1ec4041869b95b4508c69097 | Bin 0 -> 16 bytes .../5d1be7e9dda1ee8896be5b7e34a85ee16452a7b4 | 1 + .../5d5d85324c853aaaf7430aa14d52dcd7dd5c2012 | Bin 0 -> 26 bytes .../5e6deb229ac0d578b5a4dc65be25e95369c1a868 | Bin 0 -> 265 bytes .../6085ad0b48a21df555b3d523579d67eec38afe8d | Bin 0 -> 25 bytes .../60a3d7275709094b101917a88ed75b83da0b4ce2 | Bin 0 -> 19 bytes .../627ab152900b2ebdb54d64e879ad96d2fff3f04b | Bin 0 -> 24 bytes .../6390ca80cc1279e487cfce07eed9a18948d48e0a | Bin 0 -> 13 bytes .../65d00f8f2bf28a0c19a064cce0dd866efbf70cb1 | Bin 0 -> 41 bytes .../6734c22834adb777d0896832f4258d6b2bdd8f52 | Bin 0 -> 15 bytes .../6a002d9903b90d8e5aa45ee8a178177f2dc827a6 | Bin 0 -> 21 bytes .../6aea28b93b39048e554525f24c03cc8df20d4b96 | Bin 0 -> 42 bytes .../6ccd9d6b32093fe954b3ee97d8794f0b6d264933 | Bin 0 -> 10 bytes .../6dd3baddbf0766ea68ea921baa6db5c76859796c | Bin 0 -> 73 bytes .../6e14a407faae939957b80e641a836735bbdcad5a | 1 + .../71bf6b6296546665f79c9fdc21fa4294ea5ca762 | Bin 0 -> 21 bytes .../768c697e679607f2e10272a1242f3b011e032e10 | Bin 0 -> 264 bytes .../789f725eebafd61d940382d15931ae0db897531d | Bin 0 -> 18 bytes .../78af68212800e1c30c4e488b493f948740658013 | Bin 0 -> 5 bytes .../7c250f383c79fb2057bb726c1870d8ce6b12b677 | Bin 0 -> 14 bytes .../7c4e794af39a08f0a429b9a32553978b4a4d0250 | Bin 0 -> 20 bytes .../817b4a359b807c6af19f862ef1759ce7a32c59ee | Bin 0 -> 147 bytes .../8243c48ba8d2870f3007fcc1e1dbc5d640d89c89 | Bin 0 -> 19 bytes .../82837f7c443b66885aa03b859c60949078e4e3ae | Bin 0 -> 12 bytes .../835008c2f57047a9082a3573a5937d8afb6926cb | Bin 0 -> 19 bytes .../837c41995d1666ae11937f501591804e4d8d3aea | Bin 0 -> 14 bytes .../83dee3c79e7371aecff01fa92465557bbfc4713b | Bin 0 -> 10 bytes .../854fca7a34eb871fa101f171517dcf790ad56802 | Bin 0 -> 26 bytes .../86c790e576d84604190d2c8fe6df729824a25d45 | 1 + .../87996e22d70b0b8dc5bbba019add15eaebf1cbfa | Bin 0 -> 15 bytes .../889c73159bc726514772a3e41941cc92389d2dac | Bin 0 -> 34 bytes .../88c58523a1e0d3c3cb2124b17e951fb6888eb55b | Bin 0 -> 11 bytes .../89dc00dadcd7c952663a68893460456d048a7a38 | Bin 0 -> 24 bytes .../8ba2e8e067f8cdf84a6fd3ac8af7913aebb18370 | 1 + .../8c1e6ab4270792c51304ea06f47dc20ce51ba57b | 1 + .../8cfc77ce6f11c7d6e7e1938e1d39fb02a3fc51d1 | Bin 0 -> 11 bytes .../8d883f1577ca8c334b7c6d75ccb71209d71ced13 | 1 + .../8dc00598417d4eb788a77ac6ccef3cb484905d8b | 1 + .../9166d0999f92c20f325fd29b7faab06fbf44e29a | Bin 0 -> 12 bytes .../9198bae0a5489db59f5d7285e404beb7726d532f | Bin 0 -> 25 bytes .../95a8b7d543019355b2cdd74b1bb676b5a29bc5a4 | Bin 0 -> 10 bytes .../95cc6eb0fc7a3f4f9710de848cb15007ab8b950a | Bin 0 -> 26 bytes .../96b666b912f4834b427791313834b68fd2dc2161 | Bin 0 -> 11 bytes .../977a51d4b9e9908a468851d13927ee5bfeb1ba2e | Bin 0 -> 157 bytes .../97a3254991cf76a5b57619a1f0b0d621c3156039 | Bin 0 -> 22 bytes .../9842926af7ca0a8cca12604f945414f07b01e13d | 1 + .../98e86f35a726d9cb537c2d9c13c78cb7f2beb6dd | Bin 0 -> 23 bytes .../99700ed980eee6403ec5cb65c7eab58cbff25e39 | Bin 0 -> 10 bytes .../99e14fc133cbaca666b6525a72b430184acc8945 | Bin 0 -> 42 bytes .../99e9ed356525c84eec450a863545bdea9c121e17 | Bin 0 -> 45 bytes .../9ab2611cdd8e5b1dc71ebf5c88ef2d9c18f2b5c2 | Bin 0 -> 22 bytes .../9be547651566eccc263604d9064c1c14702fb9cd | Bin 0 -> 11 bytes .../9bf8c39ea8e210ce4ea8de6724d813dee1e97d27 | Bin 0 -> 138 bytes .../9cf0c05423f5eab37cfeff6f5e89469c362cda21 | Bin 0 -> 18 bytes .../a183bd04033558c87c30c5e8c673f2e7084eb587 | Bin 0 -> 18 bytes .../a226b456f772adb909f236df9e22a1e734f34238 | Bin 0 -> 9 bytes .../a24bb6244531f23a2ad4c902ee9512cc38f7fdf4 | Bin 0 -> 67 bytes .../a347d02f9c329a6ea24b8722a1ec39e6a3a179cf | 1 + .../a42c6cf1de3abfdea9b95f34687cbbe92b9a7383 | 1 + .../a56643c855a730e6373d32ce88af6887049e24ae | Bin 0 -> 11 bytes .../a5ebef01cfcd36dcc045b0649991baed09d1f97c | Bin 0 -> 21 bytes .../a60922518f7a0d93fc61b13916ef2dc45026bdd6 | Bin 0 -> 13 bytes .../a74fa143d2c3fdd5e920e1aa2d124effb0838689 | Bin 0 -> 17 bytes .../a8abd012eb59b862bf9bc1ea443d2f35a1a2e222 | 1 + .../aa85c6adb0c4e9bda0e1b3bfeea6aa2449bfcc66 | Bin 0 -> 26 bytes .../aa8fa2a4455098466a0aaf00411637a678f1fa68 | Bin 0 -> 28 bytes .../adc83b19e793491b1c6ea0fd8b46cd9f32e592fc | 1 + .../af9e40dff4ea90df093b032c69e6bb3c8f4ab555 | Bin 0 -> 10 bytes .../afb32e5be22a295a494adb7cda4ce7568b25bc14 | Bin 0 -> 26 bytes .../b05a91f0797b82bffe91d30a964ac15330baa26f | Bin 0 -> 25 bytes .../b15b207bc1a8b5ddabd5749445cdd79e07e19312 | Bin 0 -> 23 bytes .../b3915e3dc662f112d5ce728b4933dcdd4f7a17b9 | 2 + .../b40477d0dc849acd7b58fafb5a5eca20d72c59b5 | Bin 0 -> 139 bytes .../b9be97902843b7e75a2b0a86743dccb37e2be5a4 | Bin 0 -> 13 bytes .../bab33aa786059b87d29c24bc701f148708a9c00c | Bin 0 -> 41 bytes .../bb8555952c37d9b359e4ed4beb01a01e6739a2d8 | Bin 0 -> 13 bytes .../bc32bcebf40fbdd63176d680db6e0223ca411216 | Bin 0 -> 10 bytes .../bd4b399f1be2d45e3a7f4be72dfcd8e16f516970 | Bin 0 -> 41 bytes .../bf8b4530d8d246dd74ac53a13471bba17941dff7 | 1 + .../bfec9e9688dd3c8af1d4a21f4c4dc25580c76b67 | Bin 0 -> 12 bytes .../c0e79972f1be5a8105c2c2a92aa14697e884de9f | Bin 0 -> 16 bytes .../c1259f589b0998ce095b155318657e4d05b86a4c | Bin 0 -> 23 bytes .../c135d5f539e5c1c7293de4651f273290bba2d12a | Bin 0 -> 13 bytes .../c137ab0017f4f581299dafd3fb48949a7ef7bbc6 | Bin 0 -> 10 bytes .../c20d0981edf727d6d9baaafec6dfcb524a09492f | Bin 0 -> 23 bytes .../c24f2dc588d558697fdf019f4799d69611349a13 | Bin 0 -> 18 bytes .../c25042331808b88cf8c48c8de62ab3dc38202713 | Bin 0 -> 15 bytes .../c437caec2f80f0db3a3114e900737894ef70b02a | Bin 0 -> 12 bytes .../c4f87a6290aee1acfc1f26083974ce94621fca64 | 1 + .../c5b788b72af278fc8d2e932fd6475950b9c643b9 | Bin 0 -> 14 bytes .../c6a8a65ca197980287cd7552222d358f242dd291 | Bin 0 -> 176 bytes .../c6ed189128b8aea136b71f237bd7dbd1fe4ac274 | Bin 0 -> 269 bytes .../c7255dc48b42d44f6c0676d6009051b7e1aa885b | 1 + .../c827978b7b51f7099ff741e5f1c1eac22b9a233a | Bin 0 -> 13 bytes .../ca68f8a04d6c142929be9eef86ece8ec11cfae7b | Bin 0 -> 25 bytes .../ca9ec7d8d365fe163b1c8ec42963ae6b60f581a9 | Bin 0 -> 13 bytes .../cb8357675ec9519fcd37453d46cf158970c80ad4 | Bin 0 -> 10 bytes .../cc4eaf337a6e26215ddd062e1d541228dab72848 | Bin 0 -> 13 bytes .../ccd0473957ed803fad7c77b847092606f3f710f6 | Bin 0 -> 13 bytes .../cdf222b3c2ea49d30763bd2bb2c9d18605de0bc6 | Bin 0 -> 10 bytes .../ce2ae1dbdf84290c8e8fca3e43a250ee6be30625 | Bin 0 -> 16 bytes .../ce38c92a02b901ec58fb573a9f469b8d899cdfa6 | Bin 0 -> 140 bytes .../cecdeb40caec896ac0600443f3c3834d1a9e3443 | Bin 0 -> 9 bytes .../cf1634a87ec1e2f916b2d8b74a60942b6b9f7222 | Bin 0 -> 26 bytes .../cfae9b5ee2b64427b8a63ffb8ea1fd5172a79d8b | Bin 0 -> 42 bytes .../d01f7cbbd404f94459d962d84b4b5fd3168bfaf1 | Bin 0 -> 17 bytes .../d0dd7f221a6d39b8184d686772157c854891c677 | Bin 0 -> 13 bytes .../d1dccc4d9d3fdec52f99e8952c0e9d98080a07e3 | Bin 0 -> 24 bytes .../d1f8c090ae6b532382bd13e4467ca86c38207fca | Bin 0 -> 39 bytes .../d373d9943a77b723fb105c007a69a1002a07d251 | Bin 0 -> 17 bytes .../d3a786f9fb2d3e93b8b52f3f3bb3e97c90215a3f | Bin 0 -> 18 bytes .../d445354f08cb28695e96ee56232469ab2d0d2a54 | Bin 0 -> 25 bytes .../d585b0a92c38827c7307dbc7991b83a2f89eaed2 | Bin 0 -> 22 bytes .../d5dbf54ceac80fa41f6419c49714ecd5268c2f41 | Bin 0 -> 17 bytes .../d6d9a45a7dacdc2d9505c325b424122a07a801fb | Bin 0 -> 25 bytes .../d724e314a279e70a3e00c536fe4f5604434d140e | Bin 0 -> 14 bytes .../d886ba3a14eecaa5e37cc6252a079bc825f2d08e | Bin 0 -> 5 bytes .../d98310823926e66de1bc407a9180128de78e49ca | Bin 0 -> 22 bytes .../db916524f30d23812d0b79742b0c6a1913016bcd | Bin 0 -> 48 bytes .../deba0818e59e38b20cdda6baf370b75629af727e | Bin 0 -> 81 bytes .../dfc69802de0242559b7b60d6d9b44be9d0397665 | Bin 0 -> 18 bytes .../e040e1c72b5773eb10800d74c816b6ee3336bcb0 | Bin 0 -> 11 bytes .../e1c1682b5edba8d3d993306da764fc4e25de6035 | 1 + .../e1fbfe7552a4d379cf01c54e59a3dc8fbeb18ff2 | Bin 0 -> 17 bytes .../e3e15898cb2d35dfd7a3b440f71d3006dfd097ee | Bin 0 -> 15 bytes .../e44ed304ed48883b19441eede8bd9664803c0ac3 | Bin 0 -> 17 bytes .../e4eefa7b2ffa044ccfb9f9057b7c02726c060367 | Bin 0 -> 16 bytes .../e591b380040d6b395768cb1a3678bcfd34b8b90a | Bin 0 -> 9 bytes .../e7db786784ed017c7bff59cae28ed8c26fadac4b | Bin 0 -> 26 bytes .../eb18afe0e724f2c05fc421bdbd2bd52bc94ab9eb | Bin 0 -> 13 bytes .../ee275c9f32bce9de252933ffa591838a7d233a5f | Bin 0 -> 32 bytes .../ee36a5215bd209a32c58da812672a1cd9028fe16 | Bin 0 -> 75 bytes .../ee40d3c7e952bfe9d1b03406ff7a2acc4448ba4c | Bin 0 -> 23 bytes .../ef09d0f1b392f86b16823f601b7e43d05f81a394 | Bin 0 -> 10 bytes .../f0379f54d742c9d9e1187f8661c77b05a70fa9f5 | Bin 0 -> 19 bytes .../f0715009aeaf8cf6da0d9e9677598d1824880da5 | Bin 0 -> 9 bytes .../f14c6ab53785a6ee7b4614ac309108ca2a005c25 | Bin 0 -> 9 bytes .../f1755fe58cbfab2a87381ff8696c40dc948b5b79 | Bin 0 -> 14 bytes .../f52937d5469703e91bce16207b971ca5134daae4 | Bin 0 -> 137 bytes .../f566012827e68482a9e74b28d16ba4d93657d6f7 | Bin 0 -> 25 bytes .../f5a5ec60825f59406bb8b77e4f0bccb3980f88aa | Bin 0 -> 12 bytes .../f7a368896a3a1a2ae54a580fa89aa65561a7704b | Bin 0 -> 18 bytes .../f7de4f8d46c0226c588d17fd26f99119cfcc1125 | Bin 0 -> 9 bytes .../f83a6add0a0e56ae759d5daa6bcf0943c829052c | Bin 0 -> 265 bytes .../f929580b5b5dece30bf16a93a6f2409a7c5418e0 | Bin 0 -> 12 bytes .../f9c477b39d700a18d5a6f523007a37c3ea1c7d7a | Bin 0 -> 265 bytes .../fc8f99eeffb875c78806af46376635650fe58a33 | Bin 0 -> 13 bytes .../fd314dedbcc28cb457e1aeb6114fa58b8cc4e6c8 | Bin 0 -> 18 bytes .../fd60501f2f0189b0a05f0f9e7053eb7b10401f0f | Bin 0 -> 42 bytes .../fda31647598a53a4fcce5a3f431347a9b885380a | Bin 0 -> 17 bytes .../02c97b82a92acdf62134a896c5889c7f3a5742a0 | Bin 0 -> 43 bytes .../10afcd1e6acc3603568c463d4894c5e75cce93ce | Bin 0 -> 9 bytes .../1971217ec3dbd181cde5e26a96b6127998975597 | Bin 0 -> 9 bytes .../23187ed5a27cb0ed1b1ff7ade57a2a868cfd853b | Bin 0 -> 11 bytes .../26922e2e4072a635974d2e1e920be7ef619f0d62 | Bin 0 -> 13 bytes .../3fb9d18b4f09bbec54aff1dd054f8ab15faefaee | Bin 0 -> 26 bytes .../4ef27c4dff97d88b1d35cb2ff860af9d3f35e6bf | Bin 0 -> 12 bytes .../5d8cd1bef791b8111200c6fe5b118dc9f2d1b1a3 | Bin 0 -> 18 bytes 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"120" + parser-fuzz: + name: Parser Fuzzing + runs-on: ubuntu-latest + timeout-minutes: 30 + steps: + - uses: actions/checkout@v6 + with: + submodules: recursive + + - name: Install toolchain + run: | + sudo apt-get update + sudo apt-get install -y clang lld llvm python3 + + # Every one of these parsers is reachable before authentication: the SSH + # binary packet layer, the DNS/DNSSEC response path, and the SFTP request + # decoder. The corpus is carried between runs so each campaign starts + # from the coverage the previous one reached instead of from one seed. + - name: Restore fuzzing corpus + uses: actions/cache@v5 + with: + path: build/fuzz + key: parser-fuzz-corpus-${{ github.sha }} + restore-keys: | + parser-fuzz-corpus- + + - name: Run bounded coverage-guided campaign + run: make parser-fuzz + env: + XAIOS_FUZZ_RUNS: "300000" + + - name: Upload crashes and corpus + if: always() + uses: actions/upload-artifact@v7 + with: + name: parser-fuzz-evidence + path: | + build/fuzz/*-corpus/** + build/fuzz/crash-* + build/fuzz/leak-* + build/fuzz/timeout-* + if-no-files-found: ignore + retention-days: 14 + + persistence-reboot: + name: Persistence Across Reboot + runs-on: ubuntu-latest + steps: + - uses: actions/checkout@v6 + with: + submodules: recursive + + - name: Install toolchain + run: | + sudo apt-get update + sudo apt-get install -y clang lld llvm meson ninja-build qemu-system-arm qemu-efi-aarch64 mtools python3 python3-cryptography + + # Boots twice against one VirtIO volume and requires the second boot to + # reload the state the first wrote. Nothing else in CI covers durability + # across a restart, which is how a persistence subsystem that wrote to a + # snapshot-backed device went unnoticed. + - name: Verify snapshot state survives a reboot + run: make qemu-persistence-reboot + env: + XAIOS_QEMU_PERSISTENCE_TIMEOUT: "180" + model-storage-interoperability: name: ModelFS SFTP Interoperability runs-on: ubuntu-latest diff --git a/scripts/run-qemu-aarch64.sh b/scripts/run-qemu-aarch64.sh index 18a7ac8b..a222ee0c 100755 --- a/scripts/run-qemu-aarch64.sh +++ b/scripts/run-qemu-aarch64.sh @@ -152,10 +152,34 @@ case "$iommu" in ;; esac +# The virt machine only grew an "msi" property in newer QEMU releases. Older +# builds still route MSI through the ITS whenever one is instantiated, so ask +# the binary what it supports rather than passing an option that makes it +# refuse to start: on QEMU 8.2 the explicit form fails with +# "Property 'virt-8.2-machine.msi' not found" and the guest never boots. +if "$qemu" -machine virt,help 2>/dev/null | grep -q '^[[:space:]]*msi='; then + machine_msi_property=1 +else + machine_msi_property=0 +fi + case "$msi_controller" in auto) ;; - gicv2m) machine_options="$machine_options,msi=gicv2m" ;; - its) machine_options="$machine_options,its=on,msi=its" ;; + gicv2m) + if [ "$machine_msi_property" -eq 1 ]; then + machine_options="$machine_options,msi=gicv2m" + else + printf '%s\n' \ + "error: this QEMU cannot select GICv2m explicitly; it has no virt machine msi property" >&2 + exit 2 + fi + ;; + its) + machine_options="$machine_options,its=on" + if [ "$machine_msi_property" -eq 1 ]; then + machine_options="$machine_options,msi=its" + fi + ;; *) printf '%s\n' "error: XAIOS_QEMU_MSI_CONTROLLER must be auto, gicv2m, or its" >&2 exit 2 diff --git a/tests/fuzz/dns-corpus/0832a9a9ac5086bc9af775caa5170eba07c02d1b b/tests/fuzz/dns-corpus/0832a9a9ac5086bc9af775caa5170eba07c02d1b new file mode 100644 index 00000000..5d9d617e --- /dev/null +++ b/tests/fuzz/dns-corpus/0832a9a9ac5086bc9af775caa5170eba07c02d1b @@ -0,0 +1 @@ + \ No newline at end of file diff --git a/tests/fuzz/dns-corpus/08c421258fa435d5cee5f0a241472e1a66e2421b b/tests/fuzz/dns-corpus/08c421258fa435d5cee5f0a241472e1a66e2421b new file mode 100644 index 0000000000000000000000000000000000000000..0a4b01c725dd6aea8856e31f997c7ced58acee52 GIT binary patch literal 418 zcmWe(00Kq^HZb|`KZs`l85x;4N?e0O7*yek z^B5Qk85ji^B^mSH?py#8#t#&*NJDHW0a9Hs%QPM+Kvn9YX+U*9P?9kat^(ON98li? 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The "resolve/cache" wording only exists in + # the non-test build that resolves a live name, so requiring it here could + # never be satisfied. Live resolution is covered by the network suite and + # the external interoperability gates, not by this boot. "userspace_dns": [ - "/bin/nettest: userspace DNS resolve/cache path passed", + "/bin/nettest: userspace DNS fixture path passed", ], "arm_fp_neon_context": [ "scheduler: SIMD/FP interrupt preservation passed", @@ -149,7 +154,9 @@ "smmuv3", [ "SMMU: translated DMA self-test passed", - "authorized=1 forbidden=1 stale_mapping=blocked faults=1", + # Cumulative SMMU fault total, not this test's count: unrelated + # streams fault first, so the number varies by boot. + "authorized=1 forbidden=1 stale_mapping=blocked faults=", "qemu-smmu-gate: translated DMA isolation passed", ], ), @@ -158,7 +165,7 @@ [ "nvme: async self-test passed namespaces=1", "rounds=8 async=38 cancelled=1", - "qemu-nvme-gate: AArch64/x86_64 async four-queue PRP/SGL direct I/O", + "qemu-nvme-gate: aarch64/x86_64 async four-queue PRP/SGL direct I/O", ], ), "outbound_fragmentation": ( diff --git a/tests/scripts/qemu-smmu-gate.py b/tests/scripts/qemu-smmu-gate.py index cf233660..c268d0db 100644 --- a/tests/scripts/qemu-smmu-gate.py +++ b/tests/scripts/qemu-smmu-gate.py @@ -2,6 +2,7 @@ """Prove QEMU SMMUv3 translation, revocation, and stream teardown.""" import json +import re import os import select import signal @@ -19,7 +20,12 @@ "SMMU: translated DMA result=0x0", "SMMU: event type=0x10", "SMMU: translated DMA self-test passed", - "authorized=1 forbidden=1 stale_mapping=blocked faults=1", + # The fault counter is cumulative across the whole SMMU, not a count of + # this test's faults: unrelated streams that reach the SMMU without a + # configured entry raise C_BAD_STE first, so the total is whatever the + # boot happened to accumulate. Assert the outcome and that at least one + # fault was recorded, not an exact running total. + "authorized=1 forbidden=1 stale_mapping=blocked faults=", ] PANIC_MARKERS = ["CYAN SCREEN OF DEATH", "System halted. Manual reset required"] @@ -118,6 +124,13 @@ def main() -> int: missing = [marker for marker in MARKERS if marker not in text] panics = [marker for marker in PANIC_MARKERS if marker in text] failures = [f"missing marker: {marker}" for marker in missing] + # The marker above only proves the summary line was printed. Check the + # fault total separately so a run that recorded no fault at all still + # fails, without pinning the assertion to one exact cumulative value. + fault_totals = [int(value) for value in + re.findall(r"stale_mapping=blocked faults=(\d+)", text)] + if fault_totals and max(fault_totals) < 1: + failures.append("SMMU recorded no translation faults") failures.extend(f"panic marker present: {marker}" for marker in panics) if not passed and not failures: failures.append(f"QEMU exited before SMMU evidence, code={process.returncode}") diff --git a/tests/scripts/run-parser-fuzz.py b/tests/scripts/run-parser-fuzz.py index fa819fd7..74bfb940 100644 --- a/tests/scripts/run-parser-fuzz.py +++ b/tests/scripts/run-parser-fuzz.py @@ -52,12 +52,20 @@ def main() -> int: run([*common, *sources, "-o", str(binary)]) seed_corpus = ROOT / "tests" / "fuzz" / f"{name}-corpus" corpus = BUILD / f"{name}-corpus" - if corpus.exists(): - shutil.rmtree(corpus) - shutil.copytree(seed_corpus, corpus) + # Merge the checked-in seeds into whatever the corpus already holds + # rather than resetting it. A campaign that starts from one seed every + # time relearns the same shallow coverage; carrying the corpus forward + # is what lets successive runs reach deeper states. + corpus.mkdir(parents=True, exist_ok=True) + for seed in seed_corpus.iterdir(): + if seed.is_file(): + target_path = corpus / seed.name + if not target_path.exists(): + shutil.copy2(seed, target_path) run([ str(binary), str(corpus), f"-runs={RUNS}", "-timeout=5", "-rss_limit_mb=1024", "-print_final_stats=1", + f"-artifact_prefix={BUILD}/", ]) print(f"parser-fuzz: PASS targets={len(targets)} runs_per_target={RUNS}") return 0 From c9ad5765a964bb3e1086dfeef79d0245bd3ce4c0 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Andr=C3=A9=20Borchert?= Date: Sun, 23 Aug 2026 16:45:35 +0700 Subject: [PATCH 02/16] Give the boot display real resolution and an IPv6 line Three things made the guest console look like a DOS box and tell the operator less than it knows. The UEFI loader took whatever display mode the firmware happened to leave set, which on VMware Fusion is 1024x768. It never enumerated the alternatives. The loader now queries every mode the firmware offers and selects the largest one in a directly addressable 32-bit format, bounded at 2560x1600 so an unusually large mode cannot produce a framebuffer the kernel will not map. QueryMode and SetMode were declared as void pointers and are now typed, since they could not be called otherwise. The 8x8 bitmap font was drawn at a fixed 1x2 scale. That reads correctly at 1024x768 and turns into specks at 1920x1200, so selecting a better mode alone would have made things worse. Glyph scale now follows the display width, keeping roughly 100-160 columns at any supported resolution. The boot screen showed only IPv4. The kernel already knew the public IPv6 address -- the old graphical status panel drew it -- but nothing exposed it to userspace, so the console had no way to print it, and the framebuffer terminal that replaced that panel inherited the gap. Add a net_local_ipv6 syscall mirroring net_local_ipv4, and print the address in RFC 5952 form with the longest zero run collapsed. Nothing is printed when no global unicast address is configured, so an IPv4-only network still shows an IPv4-only screen: QEMU user networking offers only a site-local address and correctly prints nothing. The dual-colour XAI OS brand is unchanged and still renders, on the serial console through the escape sequences it always used and on the framebuffer through the terminal's SGR handling. Verified: boots clean on AArch64, the boot screen renders, and the ABI and documentation contracts pass with the new syscall recorded in the frozen contract. Co-Authored-By: Claude Opus 5 --- boot/uefi/include/uefi_min.h | 8 +- boot/uefi/loader_main.c | 49 +++ contracts/qemu-rc-v1.json | 717 +++++++++++++++++++++++++++------ kernel/core/boot_ui.c | 21 +- kernel/include/xaios/syscall.h | 1 + kernel/user/syscall.c | 16 + userspace/include/xaios_user.h | 5 + userspace/lib/xaios_user.c | 5 + userspace/sshd/sshd.c | 63 +++ 9 files changed, 756 insertions(+), 129 deletions(-) diff --git a/boot/uefi/include/uefi_min.h b/boot/uefi/include/uefi_min.h index 6709329f..8b02a4d0 100644 --- a/boot/uefi/include/uefi_min.h +++ b/boot/uefi/include/uefi_min.h @@ -228,8 +228,12 @@ struct efi_graphics_output_protocol_mode { }; struct efi_graphics_output_protocol { - void *query_mode; - void *set_mode; + efi_status_t(EFIAPI *query_mode)( + efi_graphics_output_protocol_t *self, uint32_t mode_number, + uint64_t *size_of_info, + efi_graphics_output_mode_information_t **info); + efi_status_t(EFIAPI *set_mode)(efi_graphics_output_protocol_t *self, + uint32_t mode_number); void *blt; efi_graphics_output_protocol_mode_t *mode; }; diff --git a/boot/uefi/loader_main.c b/boot/uefi/loader_main.c index 395c9574..8f7fcf22 100644 --- a/boot/uefi/loader_main.c +++ b/boot/uefi/loader_main.c @@ -158,6 +158,54 @@ static void collect_firmware_entropy(efi_system_table_t *system_table, boot_info->entropy_seed_size = XAIOS_BOOT_INFO_ENTROPY_SEED_BYTES; } +/* Firmware hands over whatever mode it happened to be in, which on VMware + Fusion is 1024x768. The console renders an 8x8 font into that, so the guest + looks like a DOS box on a modern display. Pick the largest mode the firmware + offers in a directly addressable 32-bit format, bounded so an unusually + large mode cannot produce a framebuffer the kernel will not map. */ +#define LOADER_MAX_DISPLAY_WIDTH UINT32_C(2560) +#define LOADER_MAX_DISPLAY_HEIGHT UINT32_C(1600) + +static void select_display_mode(efi_graphics_output_protocol_t *gop) { + if (gop == 0 || gop->query_mode == 0 || gop->set_mode == 0 || + gop->mode == 0 || gop->mode->max_mode == 0U) { + return; + } + uint32_t best_mode = gop->mode->mode; + uint64_t best_pixels = 0U; + if (gop->mode->info != 0) { + best_pixels = (uint64_t)gop->mode->info->horizontal_resolution * + (uint64_t)gop->mode->info->vertical_resolution; + } + for (uint32_t candidate = 0U; candidate < gop->mode->max_mode; ++candidate) { + efi_graphics_output_mode_information_t *info = 0; + uint64_t size_of_info = 0U; + if (is_error(gop->query_mode(gop, candidate, &size_of_info, &info)) || + info == 0) { + continue; + } + /* Only the two packed 32-bit formats are drawable by the kernel. */ + if (info->pixel_format > 1U) continue; + if (info->horizontal_resolution == 0U || info->vertical_resolution == 0U || + info->pixels_per_scan_line < info->horizontal_resolution) { + continue; + } + if (info->horizontal_resolution > LOADER_MAX_DISPLAY_WIDTH || + info->vertical_resolution > LOADER_MAX_DISPLAY_HEIGHT) { + continue; + } + uint64_t pixels = (uint64_t)info->horizontal_resolution * + (uint64_t)info->vertical_resolution; + if (pixels > best_pixels) { + best_pixels = pixels; + best_mode = candidate; + } + } + if (best_mode != gop->mode->mode) { + (void)gop->set_mode(gop, best_mode); + } +} + static void collect_framebuffer(efi_system_table_t *system_table, xaios_boot_info_t *boot_info) { if (system_table == 0 || system_table->boot_services == 0 || @@ -174,6 +222,7 @@ static void collect_framebuffer(efi_system_table_t *system_table, gop->mode->framebuffer_size == 0U) { return; } + select_display_mode(gop); const efi_graphics_output_mode_information_t *info = gop->mode->info; if (info->horizontal_resolution == 0U || info->vertical_resolution == 0U || info->pixels_per_scan_line < info->horizontal_resolution || diff --git a/contracts/qemu-rc-v1.json b/contracts/qemu-rc-v1.json index 2e41f761..0d55a297 100644 --- a/contracts/qemu-rc-v1.json +++ b/contracts/qemu-rc-v1.json @@ -6,97 +6,401 @@ "architecture": "aarch64+x86_64", "machine": "qemu-virt+q35", "firmware": "UEFI", - "accelerators": ["hvf", "tcg"], + "accelerators": [ + "hvf", + "tcg" + ], "benchmark_type": "qemu-correctness", "performance_claims_allowed": false }, "syscall_abi": { "version": 1, "syscalls": [ - {"number": 1, "name": "log", "capability": "XAIOS_CAP_LOG"}, - {"number": 2, "name": "exit", "capability": "XAIOS_CAP_EXIT"}, - {"number": 3, "name": "osctl", "capability": "XAIOS_CAP_OSCTL"}, - {"number": 4, "name": "read_service_descriptor", "capability": "XAIOS_CAP_FS_READ"}, - {"number": 5, "name": "service_status", "capability": "XAIOS_CAP_SERVICE_CONTROL"}, - {"number": 6, "name": "service_start", "capability": "XAIOS_CAP_SERVICE_CONTROL"}, - {"number": 7, "name": "service_stop", "capability": "XAIOS_CAP_SERVICE_CONTROL"}, - {"number": 8, "name": "service_restart", "capability": "XAIOS_CAP_SERVICE_CONTROL"}, - {"number": 9, "name": "service_rollback", "capability": "XAIOS_CAP_SERVICE_ROLLBACK"}, - {"number": 10, "name": "service_update", "capability": "XAIOS_CAP_UPDATE"}, - {"number": 11, "name": "fs_open", "capability": "XAIOS_CAP_FS_READ"}, - {"number": 12, "name": "fs_read", "capability": "XAIOS_CAP_FS_READ"}, - {"number": 13, "name": "fs_write", "capability": "XAIOS_CAP_FS_WRITE"}, - {"number": 14, "name": "fs_close", "capability": "XAIOS_CAP_FS_READ"}, - {"number": 15, "name": "fs_stat", "capability": "XAIOS_CAP_FS_READ"}, - {"number": 16, "name": "fs_mkdir", "capability": "XAIOS_CAP_FS_WRITE"}, - {"number": 17, "name": "fs_delete", "capability": "XAIOS_CAP_FS_WRITE"}, - {"number": 18, "name": "fs_rename", "capability": "XAIOS_CAP_FS_WRITE"}, - {"number": 19, "name": "fs_list", "capability": "XAIOS_CAP_FS_READ"}, - {"number": 20, "name": "clock_nanos", "capability": "XAIOS_CAP_TIME"}, - {"number": 21, "name": "net_udp_echo", "capability": "XAIOS_CAP_NET"}, - {"number": 22, "name": "net_tcp_connect", "capability": "XAIOS_CAP_NET"}, - {"number": 23, "name": "smp_run", "capability": "XAIOS_CAP_SMP"}, - {"number": 24, "name": "cpu_ai_decode", "capability": "XAIOS_CAP_CPU_AI"}, - {"number": 25, "name": "remote_login", "capability": "XAIOS_CAP_REMOTE_LOGIN"}, - {"number": 26, "name": "net_external_session", "capability": "XAIOS_CAP_NET"}, - {"number": 27, "name": "thread_group_run", "capability": "XAIOS_CAP_THREADS"}, - {"number": 28, "name": "ml_run", "capability": "XAIOS_CAP_ML"}, - {"number": 29, "name": "net_listen", "capability": "XAIOS_CAP_NET_SOCKET"}, - {"number": 30, "name": "net_accept", "capability": "XAIOS_CAP_NET_SOCKET"}, - {"number": 31, "name": "net_recv", "capability": "XAIOS_CAP_NET_SOCKET"}, - {"number": 32, "name": "net_send", "capability": "XAIOS_CAP_NET_SOCKET"}, - {"number": 33, "name": "net_close", "capability": "XAIOS_CAP_NET_SOCKET"}, - {"number": 34, "name": "agent_dispatch", "capability": "XAIOS_CAP_AGENT"}, - {"number": 35, "name": "random", "capability": "XAIOS_CAP_RANDOM"}, - {"number": 36, "name": "fs_seek", "capability": "XAIOS_CAP_FS_READ"}, - {"number": 37, "name": "control_query", "capability": "XAIOS_CAP_CONTROL_QUERY"}, - {"number": 38, "name": "remote_login_session", "capability": "XAIOS_CAP_REMOTE_LOGIN"}, - {"number": 39, "name": "fs_pread", "capability": "XAIOS_CAP_FS_READ"}, - {"number": 40, "name": "fs_pwrite", "capability": "XAIOS_CAP_FS_WRITE"}, - {"number": 41, "name": "fs_fsync", "capability": "XAIOS_CAP_FS_WRITE"}, - {"number": 42, "name": "thread_create", "capability": "XAIOS_CAP_THREADS"}, - {"number": 43, "name": "thread_join", "capability": "XAIOS_CAP_THREADS"}, - {"number": 44, "name": "thread_cancel", "capability": "XAIOS_CAP_THREADS"}, - {"number": 45, "name": "thread_exit", "capability": "XAIOS_CAP_THREADS"}, - {"number": 46, "name": "net_resolve", "capability": "XAIOS_CAP_NET"}, - {"number": 47, "name": "console_read", "capability": "XAIOS_CAP_CONSOLE"}, - {"number": 48, "name": "console_write", "capability": "XAIOS_CAP_CONSOLE"}, - {"number": 49, "name": "net_local_ipv4", "capability": "XAIOS_CAP_NET"}, - {"number": 50, "name": "net_connect", "capability": "XAIOS_CAP_NET_SOCKET"} + { + "number": 1, + "name": "log", + "capability": "XAIOS_CAP_LOG" + }, + { + "number": 2, + "name": "exit", + "capability": "XAIOS_CAP_EXIT" + }, + { + "number": 3, + "name": "osctl", + "capability": "XAIOS_CAP_OSCTL" + }, + { + "number": 4, + "name": "read_service_descriptor", + "capability": "XAIOS_CAP_FS_READ" + }, + { + "number": 5, + "name": "service_status", + "capability": "XAIOS_CAP_SERVICE_CONTROL" + }, + { + "number": 6, + "name": "service_start", + "capability": "XAIOS_CAP_SERVICE_CONTROL" + }, + { + "number": 7, + "name": "service_stop", + "capability": "XAIOS_CAP_SERVICE_CONTROL" + }, + { + "number": 8, + "name": "service_restart", + "capability": "XAIOS_CAP_SERVICE_CONTROL" + }, + { + "number": 9, + "name": "service_rollback", + "capability": "XAIOS_CAP_SERVICE_ROLLBACK" + }, + { + "number": 10, + "name": "service_update", + "capability": "XAIOS_CAP_UPDATE" + }, + { + "number": 11, + "name": "fs_open", + "capability": "XAIOS_CAP_FS_READ" + }, + { + "number": 12, + "name": "fs_read", + "capability": "XAIOS_CAP_FS_READ" + }, + { + "number": 13, + "name": "fs_write", + "capability": "XAIOS_CAP_FS_WRITE" + }, + { + "number": 14, + "name": "fs_close", + "capability": "XAIOS_CAP_FS_READ" + }, + { + "number": 15, + "name": "fs_stat", + "capability": "XAIOS_CAP_FS_READ" + }, + { + "number": 16, + "name": "fs_mkdir", + "capability": "XAIOS_CAP_FS_WRITE" + }, + { + "number": 17, + "name": "fs_delete", + "capability": "XAIOS_CAP_FS_WRITE" + }, + { + "number": 18, + "name": "fs_rename", + "capability": "XAIOS_CAP_FS_WRITE" + }, + { + "number": 19, + "name": "fs_list", + "capability": "XAIOS_CAP_FS_READ" + }, + { + "number": 20, + "name": "clock_nanos", + "capability": "XAIOS_CAP_TIME" + }, + { + "number": 21, + "name": "net_udp_echo", + "capability": "XAIOS_CAP_NET" + }, + { + "number": 22, + "name": "net_tcp_connect", + "capability": "XAIOS_CAP_NET" + }, + { + "number": 23, + "name": "smp_run", + "capability": "XAIOS_CAP_SMP" + }, + { + "number": 24, + "name": "cpu_ai_decode", + "capability": "XAIOS_CAP_CPU_AI" + }, + { + "number": 25, + "name": "remote_login", + "capability": "XAIOS_CAP_REMOTE_LOGIN" + }, + { + "number": 26, + "name": "net_external_session", + "capability": "XAIOS_CAP_NET" + }, + { + "number": 27, + "name": "thread_group_run", + "capability": "XAIOS_CAP_THREADS" + }, + { + "number": 28, + "name": "ml_run", + "capability": "XAIOS_CAP_ML" + }, + { + "number": 29, + "name": "net_listen", + "capability": "XAIOS_CAP_NET_SOCKET" + }, + { + "number": 30, + "name": "net_accept", + "capability": "XAIOS_CAP_NET_SOCKET" + }, + { + "number": 31, + "name": "net_recv", + "capability": "XAIOS_CAP_NET_SOCKET" + }, + { + "number": 32, + "name": "net_send", + "capability": "XAIOS_CAP_NET_SOCKET" + }, + { + "number": 33, + "name": "net_close", + "capability": "XAIOS_CAP_NET_SOCKET" + }, + { + "number": 34, + "name": "agent_dispatch", + "capability": "XAIOS_CAP_AGENT" + }, + { + "number": 35, + "name": "random", + "capability": "XAIOS_CAP_RANDOM" + }, + { + "number": 36, + "name": "fs_seek", + "capability": "XAIOS_CAP_FS_READ" + }, + { + "number": 37, + "name": "control_query", + "capability": "XAIOS_CAP_CONTROL_QUERY" + }, + { + "number": 38, + "name": "remote_login_session", + "capability": "XAIOS_CAP_REMOTE_LOGIN" + }, + { + "number": 39, + "name": "fs_pread", + "capability": "XAIOS_CAP_FS_READ" + }, + { + "number": 40, + "name": "fs_pwrite", + "capability": "XAIOS_CAP_FS_WRITE" + }, + { + "number": 41, + "name": "fs_fsync", + "capability": "XAIOS_CAP_FS_WRITE" + }, + { + "number": 42, + "name": "thread_create", + "capability": "XAIOS_CAP_THREADS" + }, + { + "number": 43, + "name": "thread_join", + "capability": "XAIOS_CAP_THREADS" + }, + { + "number": 44, + "name": "thread_cancel", + "capability": "XAIOS_CAP_THREADS" + }, + { + "number": 45, + "name": "thread_exit", + "capability": "XAIOS_CAP_THREADS" + }, + { + "number": 46, + "name": "net_resolve", + "capability": "XAIOS_CAP_NET" + }, + { + "number": 47, + "name": "console_read", + "capability": "XAIOS_CAP_CONSOLE" + }, + { + "number": 48, + "name": "console_write", + "capability": "XAIOS_CAP_CONSOLE" + }, + { + "number": 49, + "name": "net_local_ipv4", + "capability": "XAIOS_CAP_NET" + }, + { + "number": 50, + "name": "net_connect", + "capability": "XAIOS_CAP_NET_SOCKET" + }, + { + "number": 51, + "name": "net_local_ipv6", + "capability": "XAIOS_CAP_NET" + } ], "capabilities": [ - {"bit": 1, "name": "XAIOS_CAP_LOG"}, - {"bit": 2, "name": "XAIOS_CAP_EXIT"}, - {"bit": 4, "name": "XAIOS_CAP_OSCTL"}, - {"bit": 8, "name": "XAIOS_CAP_SERVICE_ROLLBACK"}, - {"bit": 16, "name": "XAIOS_CAP_UPDATE"}, - {"bit": 32, "name": "XAIOS_CAP_FS_READ"}, - {"bit": 64, "name": "XAIOS_CAP_SERVICE_CONTROL"}, - {"bit": 128, "name": "XAIOS_CAP_ADMIN"}, - {"bit": 256, "name": "XAIOS_CAP_FS_WRITE"}, - {"bit": 512, "name": "XAIOS_CAP_TIME"}, - {"bit": 1024, "name": "XAIOS_CAP_NET"}, - {"bit": 2048, "name": "XAIOS_CAP_SMP"}, - {"bit": 4096, "name": "XAIOS_CAP_CPU_AI"}, - {"bit": 8192, "name": "XAIOS_CAP_REMOTE_LOGIN"}, - {"bit": 16384, "name": "XAIOS_CAP_THREADS"}, - {"bit": 32768, "name": "XAIOS_CAP_ML"}, - {"bit": 65536, "name": "XAIOS_CAP_NET_SOCKET"}, - {"bit": 131072, "name": "XAIOS_CAP_AGENT"}, - {"bit": 262144, "name": "XAIOS_CAP_RANDOM"}, - {"bit": 524288, "name": "XAIOS_CAP_CONTROL_QUERY"}, - {"bit": 1048576, "name": "XAIOS_CAP_CONTROL_ADMIN"}, - {"bit": 2097152, "name": "XAIOS_CAP_STORAGE_READ"}, - {"bit": 4194304, "name": "XAIOS_CAP_STORAGE_MOUNT"}, - {"bit": 8388608, "name": "XAIOS_CAP_STORAGE_FORMAT"}, - {"bit": 16777216, "name": "XAIOS_CAP_STORAGE_PARTITION"}, - {"bit": 33554432, "name": "XAIOS_CAP_STORAGE_REPAIR"}, - {"bit": 67108864, "name": "XAIOS_CAP_STORAGE_RESIZE"}, - {"bit": 134217728, "name": "XAIOS_CAP_STORAGE_TRIM"}, - {"bit": 268435456, "name": "XAIOS_CAP_MODEL_STAGE"}, - {"bit": 536870912, "name": "XAIOS_CAP_MODEL_ACTIVATE"}, - {"bit": 1073741824, "name": "XAIOS_CAP_CONSOLE"}, - {"bit": 2147483648, "name": "XAIOS_CAP_CREDENTIAL_READ"} + { + "bit": 1, + "name": "XAIOS_CAP_LOG" + }, + { + "bit": 2, + "name": "XAIOS_CAP_EXIT" + }, + { + "bit": 4, + "name": "XAIOS_CAP_OSCTL" + }, + { + "bit": 8, + "name": "XAIOS_CAP_SERVICE_ROLLBACK" + }, + { + "bit": 16, + "name": "XAIOS_CAP_UPDATE" + }, + { + "bit": 32, + "name": "XAIOS_CAP_FS_READ" + }, + { + "bit": 64, + "name": "XAIOS_CAP_SERVICE_CONTROL" + }, + { + "bit": 128, + "name": "XAIOS_CAP_ADMIN" + }, + { + "bit": 256, + "name": "XAIOS_CAP_FS_WRITE" + }, + { + "bit": 512, + "name": "XAIOS_CAP_TIME" + }, + { + "bit": 1024, + "name": "XAIOS_CAP_NET" + }, + { + "bit": 2048, + "name": "XAIOS_CAP_SMP" + }, + { + "bit": 4096, + "name": "XAIOS_CAP_CPU_AI" + }, + { + "bit": 8192, + "name": "XAIOS_CAP_REMOTE_LOGIN" + }, + { + "bit": 16384, + "name": "XAIOS_CAP_THREADS" + }, + { + "bit": 32768, + "name": "XAIOS_CAP_ML" + }, + { + "bit": 65536, + "name": "XAIOS_CAP_NET_SOCKET" + }, + { + "bit": 131072, + "name": "XAIOS_CAP_AGENT" + }, + { + "bit": 262144, + "name": "XAIOS_CAP_RANDOM" + }, + { + "bit": 524288, + "name": "XAIOS_CAP_CONTROL_QUERY" + }, + { + "bit": 1048576, + "name": "XAIOS_CAP_CONTROL_ADMIN" + }, + { + "bit": 2097152, + "name": "XAIOS_CAP_STORAGE_READ" + }, + { + "bit": 4194304, + "name": "XAIOS_CAP_STORAGE_MOUNT" + }, + { + "bit": 8388608, + "name": "XAIOS_CAP_STORAGE_FORMAT" + }, + { + "bit": 16777216, + "name": "XAIOS_CAP_STORAGE_PARTITION" + }, + { + "bit": 33554432, + "name": "XAIOS_CAP_STORAGE_REPAIR" + }, + { + "bit": 67108864, + "name": "XAIOS_CAP_STORAGE_RESIZE" + }, + { + "bit": 134217728, + "name": "XAIOS_CAP_STORAGE_TRIM" + }, + { + "bit": 268435456, + "name": "XAIOS_CAP_MODEL_STAGE" + }, + { + "bit": 536870912, + "name": "XAIOS_CAP_MODEL_ACTIVATE" + }, + { + "bit": 1073741824, + "name": "XAIOS_CAP_CONSOLE" + }, + { + "bit": 2147483648, + "name": "XAIOS_CAP_CREDENTIAL_READ" + } ] }, "control_protocol": { @@ -299,9 +603,14 @@ "max_files": 64, "path_max": 64, "data_offset": 2097152, - "flags": ["read_only"], + "flags": [ + "read_only" + ], "entry_type": "file", - "entry_flags": ["executable", "manifest"], + "entry_flags": [ + "executable", + "manifest" + ], "required_paths": [ "/init", "/bin/service-manager", @@ -405,7 +714,13 @@ "name": "XAIOS service descriptor", "encoding": "ascii key=value lines", "path": "/etc/services/source-index.svc", - "required_keys": ["name", "parent", "restart", "start", "status"], + "required_keys": [ + "name", + "parent", + "restart", + "start", + "status" + ], "expected_values": { "name": "/svc/source-index", "parent": "/init", @@ -505,17 +820,50 @@ "session_lifecycle_metadata" ], "independent_gates": [ - {"name": "fault_injection", "command": "make qemu-fault-injection"}, - {"name": "storage_crash", "command": "make qemu-storage-crash-test"}, - {"name": "smmuv3", "command": "make qemu-smmu-gate"}, - {"name": "nvme", "command": "make qemu-nvme-gate"}, - {"name": "outbound_fragmentation", "command": "make qemu-outbound-fragmentation-gate"}, - {"name": "network", "command": "make qemu-network-suite"}, - {"name": "high_core", "command": "make qemu-high-core-gate"}, - {"name": "x86_64", "command": "make qemu-x86_64-smoke"}, - {"name": "x86_64_cpu_matrix", "command": "make qemu-x86_64-cpu-matrix"}, - {"name": "x86_64_platform_matrix", "command": "make qemu-x86_64-platform-matrix"}, - {"name": "x86_64_network", "command": "XAIOS_QEMU_NETWORK_ARCH=x86_64 python3 tests/scripts/qemu-docker-network-suite.py"} + { + "name": "fault_injection", + "command": "make qemu-fault-injection" + }, + { + "name": "storage_crash", + "command": "make qemu-storage-crash-test" + }, + { + "name": "smmuv3", + "command": "make qemu-smmu-gate" + }, + { + "name": "nvme", + "command": "make qemu-nvme-gate" + }, + { + "name": "outbound_fragmentation", + "command": "make qemu-outbound-fragmentation-gate" + }, + { + "name": "network", + "command": "make qemu-network-suite" + }, + { + "name": "high_core", + "command": "make qemu-high-core-gate" + }, + { + "name": "x86_64", + "command": "make qemu-x86_64-smoke" + }, + { + "name": "x86_64_cpu_matrix", + "command": "make qemu-x86_64-cpu-matrix" + }, + { + "name": "x86_64_platform_matrix", + "command": "make qemu-x86_64-platform-matrix" + }, + { + "name": "x86_64_network", + "command": "XAIOS_QEMU_NETWORK_ARCH=x86_64 python3 tests/scripts/qemu-docker-network-suite.py" + } ], "x86_qemu_service_parity": true, "x86_physical_support": false @@ -523,35 +871,156 @@ "cpu_matrix": { "schema": "xaios.qemu.cpu_matrix.v1", "arm64_boot_tiers": [ - {"name": "fast-local-hvf-host", "cpu": "host", "accelerator": "hvf", "required": false, "run_if_env": "XAIOS_QEMU_RUN_OPTIONAL_HVF=1", "validation": "qemu-smoke-default"}, - {"name": "baseline-cortex-a53", "cpu": "cortex-a53", "accelerator": "tcg", "validation": "qemu-boot-probe"}, - {"name": "common-cortex-a72", "cpu": "cortex-a72", "accelerator": "tcg", "validation": "qemu-boot-probe"}, - {"name": "modern-cortex-a76", "cpu": "cortex-a76", "accelerator": "tcg", "validation": "qemu-boot-probe"}, - {"name": "newer-cortex-a710", "cpu": "cortex-a710", "accelerator": "tcg", "validation": "qemu-boot-probe"}, - {"name": "server-neoverse-n1", "cpu": "neoverse-n1", "accelerator": "tcg", "validation": "qemu-boot-probe"}, - {"name": "server-neoverse-n2", "cpu": "neoverse-n2", "accelerator": "tcg", "validation": "qemu-boot-probe"}, - {"name": "performance-neoverse-v1", "cpu": "neoverse-v1", "accelerator": "tcg", "validation": "qemu-boot-probe"}, - {"name": "future-max", "cpu": "max", "accelerator": "tcg", "validation": "qemu-boot-probe"} + { + "name": "fast-local-hvf-host", + "cpu": "host", + "accelerator": "hvf", + "required": false, + "run_if_env": "XAIOS_QEMU_RUN_OPTIONAL_HVF=1", + "validation": "qemu-smoke-default" + }, + { + "name": "baseline-cortex-a53", + "cpu": "cortex-a53", + "accelerator": "tcg", + "validation": "qemu-boot-probe" + }, + { + "name": "common-cortex-a72", + "cpu": "cortex-a72", + "accelerator": "tcg", + "validation": "qemu-boot-probe" + }, + { + "name": "modern-cortex-a76", + "cpu": "cortex-a76", + "accelerator": "tcg", + "validation": "qemu-boot-probe" + }, + { + "name": "newer-cortex-a710", + "cpu": "cortex-a710", + "accelerator": "tcg", + "validation": "qemu-boot-probe" + }, + { + "name": "server-neoverse-n1", + "cpu": "neoverse-n1", + "accelerator": "tcg", + "validation": "qemu-boot-probe" + }, + { + "name": "server-neoverse-n2", + "cpu": "neoverse-n2", + "accelerator": "tcg", + "validation": "qemu-boot-probe" + }, + { + "name": "performance-neoverse-v1", + "cpu": "neoverse-v1", + "accelerator": "tcg", + "validation": "qemu-boot-probe" + }, + { + "name": "future-max", + "cpu": "max", + "accelerator": "tcg", + "validation": "qemu-boot-probe" + } ], "x86_64_command_tiers": [ - {"name": "intel-desktop-conservative", "cpu": "Skylake-Client", "validation": "qemu-smoke"}, - {"name": "intel-desktop-alderlake-compat", "cpu": "max", "validation": "qemu-smoke"}, - {"name": "intel-server-skylake", "cpu": "Skylake-Server", "validation": "qemu-smoke"}, - {"name": "intel-server-cascadelake", "cpu": "Cascadelake-Server", "validation": "qemu-smoke"}, - {"name": "intel-server-cooperlake", "cpu": "Cooperlake", "validation": "qemu-smoke"}, - {"name": "intel-server-icelake", "cpu": "Icelake-Server", "validation": "qemu-smoke"}, - {"name": "intel-server-sapphirerapids", "cpu": "SapphireRapids", "validation": "qemu-smoke"}, - {"name": "intel-server-graniterapids", "cpu": "GraniteRapids", "validation": "qemu-smoke"}, - {"name": "intel-server-diamondrapids", "cpu": "DiamondRapids", "required": false, "validation": "qemu-smoke"}, - {"name": "intel-server-sierraforest", "cpu": "SierraForest", "validation": "qemu-smoke"}, - {"name": "intel-server-clearwaterforest", "cpu": "ClearwaterForest", "validation": "qemu-smoke"}, - {"name": "intel-server-edge-denverton", "cpu": "Denverton", "validation": "qemu-smoke"}, - {"name": "intel-server-edge-snowridge", "cpu": "Snowridge", "validation": "qemu-smoke"}, - {"name": "amd-epyc", "cpu": "EPYC", "validation": "qemu-smoke"}, - {"name": "amd-epyc-rome", "cpu": "EPYC-Rome", "validation": "qemu-smoke"}, - {"name": "amd-epyc-milan", "cpu": "EPYC-Milan", "validation": "qemu-smoke"}, - {"name": "amd-epyc-genoa", "cpu": "EPYC-Genoa", "validation": "qemu-smoke"}, - {"name": "amd-epyc-turin", "cpu": "EPYC-Turin", "required": false, "validation": "qemu-smoke"} + { + "name": "intel-desktop-conservative", + "cpu": "Skylake-Client", + "validation": "qemu-smoke" + }, + { + "name": "intel-desktop-alderlake-compat", + "cpu": "max", + "validation": "qemu-smoke" + }, + { + "name": "intel-server-skylake", + "cpu": "Skylake-Server", + "validation": "qemu-smoke" + }, + { + "name": "intel-server-cascadelake", + "cpu": "Cascadelake-Server", + "validation": "qemu-smoke" + }, + { + "name": "intel-server-cooperlake", + "cpu": "Cooperlake", + "validation": "qemu-smoke" + }, + { + "name": "intel-server-icelake", + "cpu": "Icelake-Server", + "validation": "qemu-smoke" + }, + { + "name": "intel-server-sapphirerapids", + "cpu": "SapphireRapids", + "validation": "qemu-smoke" + }, + { + "name": "intel-server-graniterapids", + "cpu": "GraniteRapids", + "validation": "qemu-smoke" + }, + { + "name": "intel-server-diamondrapids", + "cpu": "DiamondRapids", + "required": false, + "validation": "qemu-smoke" + }, + { + "name": "intel-server-sierraforest", + "cpu": "SierraForest", + "validation": "qemu-smoke" + }, + { + "name": "intel-server-clearwaterforest", + "cpu": "ClearwaterForest", + "validation": "qemu-smoke" + }, + { + "name": "intel-server-edge-denverton", + "cpu": "Denverton", + "validation": "qemu-smoke" + }, + { + "name": "intel-server-edge-snowridge", + "cpu": "Snowridge", + "validation": "qemu-smoke" + }, + { + "name": "amd-epyc", + "cpu": "EPYC", + "validation": "qemu-smoke" + }, + { + "name": "amd-epyc-rome", + "cpu": "EPYC-Rome", + "validation": "qemu-smoke" + }, + { + "name": "amd-epyc-milan", + "cpu": "EPYC-Milan", + "validation": "qemu-smoke" + }, + { + "name": "amd-epyc-genoa", + "cpu": "EPYC-Genoa", + "validation": "qemu-smoke" + }, + { + "name": "amd-epyc-turin", + "cpu": "EPYC-Turin", + "required": false, + "validation": "qemu-smoke" + } ] }, "out_of_scope_before_intel": [ diff --git a/kernel/core/boot_ui.c b/kernel/core/boot_ui.c index de9e1389..fe1204cf 100644 --- a/kernel/core/boot_ui.c +++ b/kernel/core/boot_ui.c @@ -14,9 +14,16 @@ #define FB_BAR_MAX_WIDTH UINT32_C(720) #define FB_GLYPH_WIDTH UINT32_C(8) #define FB_GLYPH_HEIGHT UINT32_C(8) -#define FB_GLYPH_X_SCALE UINT32_C(1) -#define FB_GLYPH_Y_SCALE UINT32_C(2) -#define FB_GLYPH_ADVANCE UINT32_C(9) +/* Glyph geometry follows the mode the firmware gave us. The bitmap font is + 8x8, so a fixed 1x2 scale that reads well at 1024x768 turns into unreadable + specks once the loader selects a 1920x1200 mode. Scale with the display so + text keeps roughly the same physical size instead. */ +static uint32_t g_glyph_x_scale = UINT32_C(1); +static uint32_t g_glyph_y_scale = UINT32_C(2); +static uint32_t g_glyph_advance = UINT32_C(9); +#define FB_GLYPH_X_SCALE g_glyph_x_scale +#define FB_GLYPH_Y_SCALE g_glyph_y_scale +#define FB_GLYPH_ADVANCE g_glyph_advance typedef struct boot_framebuffer { volatile uint32_t *pixels; @@ -615,6 +622,14 @@ static void fb_init(const xaios_boot_info_t *boot) { g_framebuffer.height = boot->framebuffer_height; g_framebuffer.stride = boot->framebuffer_pixels_per_scan_line; g_framebuffer.format = boot->framebuffer_format; + + /* Roughly 100-160 columns at any supported width. */ + uint32_t scale = g_framebuffer.width / UINT32_C(1024); + if (scale == 0U) scale = 1U; + if (scale > 3U) scale = 3U; + g_glyph_x_scale = scale; + g_glyph_y_scale = scale * 2U; + g_glyph_advance = (FB_GLYPH_WIDTH + 1U) * scale; } #if !XAIOS_BOOT_TEST_APPS && !XAIOS_BOOT_VERBOSE diff --git a/kernel/include/xaios/syscall.h b/kernel/include/xaios/syscall.h index c4e1b288..f04c2e1a 100644 --- a/kernel/include/xaios/syscall.h +++ b/kernel/include/xaios/syscall.h @@ -54,6 +54,7 @@ #define XAIOS_SYSCALL_CONSOLE_WRITE UINT64_C(48) #define XAIOS_SYSCALL_NET_LOCAL_IPV4 UINT64_C(49) #define XAIOS_SYSCALL_NET_CONNECT UINT64_C(50) +#define XAIOS_SYSCALL_NET_LOCAL_IPV6 UINT64_C(51) #define XAIOS_CLOCK_MONOTONIC UINT64_C(0) #define XAIOS_CLOCK_REALTIME UINT64_C(1) diff --git a/kernel/user/syscall.c b/kernel/user/syscall.c index f768500c..8d8212af 100644 --- a/kernel/user/syscall.c +++ b/kernel/user/syscall.c @@ -89,6 +89,7 @@ static const xaios_syscall_entry_t g_syscall_table[] = { {XAIOS_SYSCALL_CONSOLE_WRITE, "console_write", XAIOS_CAP_CONSOLE}, {XAIOS_SYSCALL_NET_LOCAL_IPV4, "net_local_ipv4", XAIOS_CAP_NET}, {XAIOS_SYSCALL_NET_CONNECT, "net_connect", XAIOS_CAP_NET_SOCKET}, + {XAIOS_SYSCALL_NET_LOCAL_IPV6, "net_local_ipv6", XAIOS_CAP_NET}, }; static uint64_t control_operation_capability(uint16_t operation) { @@ -522,6 +523,21 @@ uint64_t syscall_dispatch(uint64_t syscall, uint64_t arg0, uint64_t arg1, return arg1; } + if (syscall == XAIOS_SYSCALL_NET_LOCAL_IPV6) { + xaios_ip_addr_t address; + if (arg1 != 16U || + vmm_validate_user_buffer(arg0, 16U, XAIOS_VMM_WRITABLE) != XAIOS_OK) { + return reject_syscall(syscall, arg0, arg1, "bad-ipv6-buffer"); + } + if (network_stack_local_public_ipv6(&address) != XAIOS_OK) { + user_process_note_syscall(0); + return 0U; + } + bytes_copy((void *)(uintptr_t)arg0, address.addr, 16U); + user_process_note_syscall(0); + return 1U; + } + if (syscall == XAIOS_SYSCALL_NET_LOCAL_IPV4) { user_process_note_syscall(0); return network_config_local_ipv4(); diff --git a/userspace/include/xaios_user.h b/userspace/include/xaios_user.h index 7b9b479a..d65306de 100644 --- a/userspace/include/xaios_user.h +++ b/userspace/include/xaios_user.h @@ -4,6 +4,7 @@ typedef unsigned long long u64; typedef unsigned int u32; typedef unsigned short u16; +typedef unsigned char u8; typedef int s32; typedef long long s64; @@ -77,6 +78,7 @@ void *xaios_memcpy(void *dst, const void *src, u64 size); #define XAIOS_SYSCALL_CONSOLE_WRITE 48ULL #define XAIOS_SYSCALL_NET_LOCAL_IPV4 49ULL #define XAIOS_SYSCALL_NET_CONNECT 50ULL +#define XAIOS_SYSCALL_NET_LOCAL_IPV6 51ULL #define XAIOS_THREAD_CPU_ANY (~0ULL) #define XAIOS_CLOCK_MONOTONIC 0ULL @@ -360,6 +362,9 @@ int xaios_remote_login_child_release(u64 child_channel_id); int xaios_console_read(char *value); int xaios_console_write(const char *buffer, u64 size); u32 xaios_net_local_ipv4(void); +/* Copies the public IPv6 address out and returns 1, or returns 0 when the + guest has no public IPv6 address configured. */ +int xaios_net_local_ipv6(u8 address[16]); int xaios_net_external_session(u64 protocol, u64 port, const void *payload, u64 payload_size, char *output, u64 output_size, u64 *out_size); diff --git a/userspace/lib/xaios_user.c b/userspace/lib/xaios_user.c index c119c199..d3c72bea 100644 --- a/userspace/lib/xaios_user.c +++ b/userspace/lib/xaios_user.c @@ -105,6 +105,11 @@ u32 xaios_net_local_ipv4(void) { return (u32)xaios_syscall3(XAIOS_SYSCALL_NET_LOCAL_IPV4, 0U, 0U, 0U); } +int xaios_net_local_ipv6(u8 address[16]) { + return (int)(s64)xaios_syscall3(XAIOS_SYSCALL_NET_LOCAL_IPV6, + (u64)(void *)address, 16U, 0U); +} + void xaios_exit(int code) { (void)xaios_syscall3(XAIOS_SYSCALL_EXIT, (u64)(u32)code, 0, 0); for (;;) { diff --git a/userspace/sshd/sshd.c b/userspace/sshd/sshd.c index 891bea1f..081d21be 100644 --- a/userspace/sshd/sshd.c +++ b/userspace/sshd/sshd.c @@ -435,6 +435,68 @@ static void console_write_ipv4(uint32_t address) { console_write(line); } +/* Render the public IPv6 address in RFC 5952 form, with the longest run of + zero groups collapsed to "::". Prints nothing when the guest has no public + IPv6 address, so an IPv4-only network shows an IPv4-only boot screen. */ +static void console_write_ipv6(void) { + uint8_t address[16]; + if (xaios_net_local_ipv6(address) != 1) return; + + uint16_t groups[8]; + for (uint32_t i = 0U; i < 8U; ++i) { + groups[i] = (uint16_t)(((uint16_t)address[i * 2U] << 8U) | + address[i * 2U + 1U]); + } + uint32_t best_start = 8U; + uint32_t best_length = 0U; + uint32_t run_start = 8U; + uint32_t run_length = 0U; + for (uint32_t i = 0U; i < 8U; ++i) { + if (groups[i] == 0U) { + if (run_length == 0U) run_start = i; + ++run_length; + if (run_length > best_length) { + best_length = run_length; + best_start = run_start; + } + } else { + run_length = 0U; + } + } + if (best_length < 2U) best_start = 8U; + + static const char hex[] = "0123456789abcdef"; + char line[48]; + u64 offset = 0U; + xaios_memzero(line, sizeof(line)); + for (uint32_t i = 0U; i < 8U;) { + if (i == best_start) { + xaios_append_cstr(line, sizeof(line), &offset, i == 0U ? "::" : ":"); + i += best_length; + continue; + } + if (i != 0U && i != best_start) { + xaios_append_cstr(line, sizeof(line), &offset, ":"); + } + uint16_t value = groups[i]; + char digits[4]; + uint32_t count = 0U; + do { + digits[count++] = hex[value & 0xfU]; + value = (uint16_t)(value >> 4U); + } while (value != 0U); + while (count != 0U) { + char single[2]; + single[0] = digits[--count]; + single[1] = '\0'; + xaios_append_cstr(line, sizeof(line), &offset, single); + } + ++i; + } + console_write("\nIPv6: "); + console_write(line); +} + static void console_write_error(int32_t status) { char line[32]; u64 offset = 0U; @@ -604,6 +666,7 @@ static void console_render_boot_status(void) { console_write("Loaded: system services\nLoading: complete\n"); console_write("Remaining: 0 components\n\nIPv4: "); console_write_ipv4(g_console_ipv4); + console_write_ipv6(); console_write("\nSSH server: "); if (g_console_ssh_ready != 0U) { console_write("up and running (tcp/22)\n\n"); From df71173afeb9e98f1cf3f86a83ffd1b1c55210ef Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Andr=C3=A9=20Borchert?= Date: Sun, 23 Aug 2026 18:11:32 +0700 Subject: [PATCH 03/16] Launch terminal applications identically on both consoles htop rendered as a flat text dump on the local console and as the familiar full-screen monitor over SSH. The application was never the difference: the SSH channel rewrites the command to "--color --interactive --columns N --rows N" before running it, but that promotion lived inside prepare_terminal_command, gated on a PTY request, and the local console had no equivalent. Same binary, different invocation, so the two surfaces disagreed about how an application should look. Extract the rules into ssh_terminal_promote_command and call it from both, rather than keeping a second copy in sshd.c that would drift. The local console has no window-size protocol, so it passes a conservative 80x24 that renders correctly on a serial line and inside the framebuffer terminal alike. The local console now shows the CPU meters, load average, uptime, memory and swap bars, the aligned PID/CPU%/MEM%/TIME+/RES_KIB columns and the function key bar, exactly as an SSH session does. The syscall self-test marker moves from 50 to 51 entries to match the net_local_ipv6 addition. Known remaining difference, not addressed here: over SSH the channel keeps an interactive session alive after the first frame, holding the sort key, filter, selection and refresh timer in ssh_channel_t and feeding keystrokes back in. The local console renders one frame and returns to the prompt. Closing that gap means lifting the interactive session state out of ssh_channel_t into a surface-independent session both consoles drive, which is a refactor of its own rather than an option change. Verified: qemu-smoke, qemu-local-console-gate, the ABI contract and the documentation contract all pass. Co-Authored-By: Claude Opus 5 --- tests/scripts/qemu-smoke.py | 2 +- userspace/sshd/ssh_channel.c | 23 +++++++++++++++++------ userspace/sshd/ssh_channel.h | 7 +++++++ userspace/sshd/sshd.c | 13 +++++++++++++ 4 files changed, 38 insertions(+), 7 deletions(-) diff --git a/tests/scripts/qemu-smoke.py b/tests/scripts/qemu-smoke.py index b36b0167..72534a50 100644 --- a/tests/scripts/qemu-smoke.py +++ b/tests/scripts/qemu-smoke.py @@ -64,7 +64,7 @@ "initramfs: child service=/svc/source-index parent=/init restart=never", "initramfs: mounted rofs version=2 files=", "initramfs: rofs metadata/config self-test passed", - "syscall: table self-test passed entries=50", + "syscall: table self-test passed entries=51", "virtio-rng: entropy delivery self-test passed", "user: process table initialized slots=1024", "user: process lifecycle invalid/failed transition self-test passed", diff --git a/userspace/sshd/ssh_channel.c b/userspace/sshd/ssh_channel.c index 2bc19c65..d5991f1f 100644 --- a/userspace/sshd/ssh_channel.c +++ b/userspace/sshd/ssh_channel.c @@ -534,10 +534,13 @@ static int htop_build_command(const ssh_channel_t *ch, char *command, return 0; } -static int prepare_terminal_command(const ssh_channel_t *ch, char *command, - uint32_t capacity) { - if (ch == 0 || command == 0 || ch->pty_requested == 0U || - command_token_equal(command, "htop") == 0 || +/* Shared by the SSH channel and the local console so an application is + launched with the same options on both, and therefore renders the same. + The two surfaces still differ in what happens after the first frame: the + channel keeps an interactive session alive, the console does not yet. */ +int ssh_terminal_promote_command(char *command, uint32_t capacity, + uint32_t columns, uint32_t rows) { + if (command == 0 || command_token_equal(command, "htop") == 0 || command_has_option(command, "--plain") != 0) { return 0; } @@ -551,17 +554,25 @@ static int prepare_terminal_command(const ssh_channel_t *ch, char *command, } if (command_has_option(command, "--columns") == 0 && (append_command_text(command, capacity, " --columns ") != 0 || - append_command_u32(command, capacity, ch->terminal_columns) != 0)) { + append_command_u32(command, capacity, columns) != 0)) { return -1; } if (command_has_option(command, "--rows") == 0 && (append_command_text(command, capacity, " --rows ") != 0 || - append_command_u32(command, capacity, ch->terminal_rows) != 0)) { + append_command_u32(command, capacity, rows) != 0)) { return -1; } return 0; } +static int prepare_terminal_command(const ssh_channel_t *ch, char *command, + uint32_t capacity) { + if (ch == 0 || ch->pty_requested == 0U) return 0; + return ssh_terminal_promote_command(command, capacity, ch->terminal_columns, + ch->terminal_rows); +} + + static int command_rate_allowed(ssh_connection_t *connection) { static const u64 window_ns = 60000000000ULL; u64 now; diff --git a/userspace/sshd/ssh_channel.h b/userspace/sshd/ssh_channel.h index 54fe35c9..a11daa03 100644 --- a/userspace/sshd/ssh_channel.h +++ b/userspace/sshd/ssh_channel.h @@ -79,4 +79,11 @@ int ssh_channel_send_data(int sockfd, uint32_t remote_id, int ssh_channel_agent_send(const ssh_channel_t *session, const uint8_t *data, uint32_t len); + +/* Apply the terminal-application option promotion used for a PTY session. + Exposed so the local console launches applications exactly as the SSH + channel does, instead of maintaining a second copy of the rules. */ +int ssh_terminal_promote_command(char *command, uint32_t capacity, + uint32_t columns, uint32_t rows); + #endif diff --git a/userspace/sshd/sshd.c b/userspace/sshd/sshd.c index 081d21be..b5e847f5 100644 --- a/userspace/sshd/sshd.c +++ b/userspace/sshd/sshd.c @@ -170,6 +170,12 @@ static void sha256_update_kex_secret(sha256_ctx_t *context, sha256_update_mpint(context, value); } +/* The local console has no window-size protocol, so applications are given a + conservative terminal that renders correctly on a serial line and inside the + framebuffer terminal alike. */ +#define SSHD_CONSOLE_COLUMNS 80U +#define SSHD_CONSOLE_ROWS 24U + static int g_log_fd = -1; static uint32_t g_log_bytes = 0; @@ -727,6 +733,13 @@ static void console_execute_command(void) { return; } else { u64 output_bytes = 0U; + /* Launch terminal applications with the same options the SSH channel + gives them, so htop and friends render identically on both surfaces + rather than falling back to their plain snapshot form here. */ + (void)ssh_terminal_promote_command(g_console_command, + sizeof(g_console_command), + SSHD_CONSOLE_COLUMNS, + SSHD_CONSOLE_ROWS); xaios_memzero(g_console_output, sizeof(g_console_output)); int status = xaios_remote_login_session( SSHD_CONSOLE_SESSION_ID, "admin", g_console_command, g_console_output, From a64fad1fc2b07384b1e2fea3ee0355117bdd7776 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Andr=C3=A9=20Borchert?= Date: Sun, 23 Aug 2026 19:06:56 +0700 Subject: [PATCH 04/16] Share one interactive session between both consoles Making htop launch the same way on both surfaces got the first frame right and stopped there: over SSH the channel kept a live session, and locally the frame was printed once and the shell came back. The two surfaces could not behave the same because only one of them had a session at all -- the state lived in ssh_channel_t, so the console had nothing to drive. Lift it out. xaios_htop_session_t holds what the monitor is doing: sort key and direction, filter text and mode, selection, scroll offsets, refresh interval, help state and the terminal it was launched for. xaios_htop_sink_t says where output goes and how a sampling command runs. The logic -- start, build command, frame pacing, keystroke handling, help, filter prompt, teardown -- now takes those two and nothing else, so both consoles run the same state machine rather than two implementations that drift. The SSH channel embeds the session and supplies a sink over its transport and connection. The local console holds one and supplies a sink that writes to the console and samples through its own remote-login session, wired into command dispatch, input routing and the service tick the way nano and pong already are. Ending the session is signalled by clearing session->active rather than a return code, because each surface finishes differently: the channel returns to its shell or closes, the console reprints its prompt. An earlier version keyed on the return value and silently skipped the console teardown, leaving no prompt after quitting. Two conventions worth recording, both of which cost a debug cycle here: console_write_bytes reports success as 0 rather than a byte count, and the page-geometry helpers now take their dimensions from the session instead of reading the channel's terminal size. Verified: on the local console htop now refreshes without input, accepts sort keys with the change persisting across frames, opens and closes help, quits back to a working shell. Over SSH native_htop_pty_ansi, native_htop_non_pty_plain, native_htop_shell_restore and native_htop_invalid_option_rejected all still pass, along with qemu-smoke, qemu-local-console-gate, qemu-keyboard-input-gate, the ABI contract and the documentation contract. Co-Authored-By: Claude Opus 5 --- userspace/sshd/ssh_channel.c | 493 ++++++++++++++++++++--------------- userspace/sshd/ssh_channel.h | 81 ++++-- userspace/sshd/sshd.c | 108 +++++++- 3 files changed, 458 insertions(+), 224 deletions(-) diff --git a/userspace/sshd/ssh_channel.c b/userspace/sshd/ssh_channel.c index d5991f1f..d2689493 100644 --- a/userspace/sshd/ssh_channel.c +++ b/userspace/sshd/ssh_channel.c @@ -431,6 +431,8 @@ static int command_option_text(const char *command, const char *option, return 0; } +static xaios_htop_sink_t channel_htop_sink(ssh_channel_t *ch); + static const char *htop_sort_name(uint32_t key) { switch (key) { case SSH_HTOP_SORT_MEMORY: return "mem"; @@ -444,93 +446,97 @@ static const char *htop_sort_name(uint32_t key) { } } -static void htop_initialize(ssh_channel_t *ch, const char *command) { +void xaios_htop_start(xaios_htop_session_t *session, const char *command, + uint32_t columns, uint32_t rows) { char sort[24]; uint32_t value; - ch->htop_active = 1U; - ch->htop_show_all = command_has_option(command, "--active") == 0; - ch->htop_show_cpus = command_has_option(command, "--no-cpus") == 0; - ch->htop_sort_key = SSH_HTOP_SORT_CPU; - ch->htop_reverse = command_has_option(command, "--reverse") != 0; - ch->htop_cpu_start = 0U; - ch->htop_cpu_count = UINT32_MAX; - ch->htop_process_start = 0U; - ch->htop_selected = 0U; - ch->htop_refresh_ms = SSH_HTOP_DEFAULT_REFRESH_MS; - ch->htop_filter_mode = 0U; - ch->htop_help = 0U; - ch->htop_filter_length = 0U; - ch->htop_last_frame_ns = 0U; - ch->htop_filter[0] = '\0'; + session->active = 1U; + session->show_all = command_has_option(command, "--active") == 0; + session->show_cpus = command_has_option(command, "--no-cpus") == 0; + session->sort_key = SSH_HTOP_SORT_CPU; + session->reverse = command_has_option(command, "--reverse") != 0; + session->cpu_start = 0U; + session->cpu_count = UINT32_MAX; + session->process_start = 0U; + session->selected = 0U; + session->refresh_ms = SSH_HTOP_DEFAULT_REFRESH_MS; + session->filter_mode = 0U; + session->help = 0U; + session->filter_length = 0U; + session->last_frame_ns = 0U; + session->filter[0] = '\0'; if (command_has_option(command, "--tree") != 0) { - ch->htop_sort_key = SSH_HTOP_SORT_PARENT; + session->sort_key = SSH_HTOP_SORT_PARENT; } else if (command_option_text(command, "--sort", sort, sizeof(sort)) > 0) { - if (ssh_str_eq(sort, "mem")) ch->htop_sort_key = SSH_HTOP_SORT_MEMORY; - else if (ssh_str_eq(sort, "time")) ch->htop_sort_key = SSH_HTOP_SORT_TIME; - else if (ssh_str_eq(sort, "pid")) ch->htop_sort_key = SSH_HTOP_SORT_PID; - else if (ssh_str_eq(sort, "state")) ch->htop_sort_key = SSH_HTOP_SORT_STATE; - else if (ssh_str_eq(sort, "syscalls")) ch->htop_sort_key = SSH_HTOP_SORT_SYSCALLS; - else if (ssh_str_eq(sort, "command")) ch->htop_sort_key = SSH_HTOP_SORT_COMMAND; - else if (ssh_str_eq(sort, "parent")) ch->htop_sort_key = SSH_HTOP_SORT_PARENT; + if (ssh_str_eq(sort, "mem")) session->sort_key = SSH_HTOP_SORT_MEMORY; + else if (ssh_str_eq(sort, "time")) session->sort_key = SSH_HTOP_SORT_TIME; + else if (ssh_str_eq(sort, "pid")) session->sort_key = SSH_HTOP_SORT_PID; + else if (ssh_str_eq(sort, "state")) session->sort_key = SSH_HTOP_SORT_STATE; + else if (ssh_str_eq(sort, "syscalls")) session->sort_key = SSH_HTOP_SORT_SYSCALLS; + else if (ssh_str_eq(sort, "command")) session->sort_key = SSH_HTOP_SORT_COMMAND; + else if (ssh_str_eq(sort, "parent")) session->sort_key = SSH_HTOP_SORT_PARENT; } if (command_option_u32(command, "--cpu-start", &value) > 0) { - ch->htop_cpu_start = value; + session->cpu_start = value; } if (command_option_u32(command, "--cpu-count", &value) > 0 && value != 0U) { - ch->htop_cpu_count = value; + session->cpu_count = value; } if (command_option_u32(command, "--process-start", &value) > 0) { - ch->htop_process_start = value; + session->process_start = value; } if (command_option_u32(command, "--selected", &value) > 0) { - ch->htop_selected = value; + session->selected = value; } if (command_option_u32(command, "--sample-ms", &value) > 0) { - ch->htop_refresh_ms = value < SSH_HTOP_MIN_REFRESH_MS + session->refresh_ms = value < SSH_HTOP_MIN_REFRESH_MS ? SSH_HTOP_MIN_REFRESH_MS : value; - if (ch->htop_refresh_ms > SSH_HTOP_MAX_REFRESH_MS) { - ch->htop_refresh_ms = SSH_HTOP_MAX_REFRESH_MS; + if (session->refresh_ms > SSH_HTOP_MAX_REFRESH_MS) { + session->refresh_ms = SSH_HTOP_MAX_REFRESH_MS; } } - if (command_option_text(command, "--filter", ch->htop_filter, - sizeof(ch->htop_filter)) > 0) { - ch->htop_filter_length = ssh_str_len(ch->htop_filter); + if (command_option_text(command, "--filter", session->filter, + sizeof(session->filter)) > 0) { + session->filter_length = ssh_str_len(session->filter); } + session->columns = columns; + session->rows = rows; } -static int htop_build_command(const ssh_channel_t *ch, char *command, +int xaios_htop_build_command(const xaios_htop_session_t *session, + char *command, uint32_t capacity) { command[0] = '\0'; if (append_command_text(command, capacity, "htop --color --interactive --sample-ms ") != 0 || append_command_u32(command, capacity, SSH_HTOP_SAMPLE_MS) != 0 || append_command_text(command, capacity, " --columns ") != 0 || - append_command_u32(command, capacity, ch->terminal_columns) != 0 || + append_command_u32(command, capacity, session->columns) != 0 || append_command_text(command, capacity, " --rows ") != 0 || - append_command_u32(command, capacity, ch->terminal_rows) != 0 || + append_command_u32(command, capacity, session->rows) != 0 || append_command_text(command, capacity, " --sort ") != 0 || - append_command_text(command, capacity, htop_sort_name(ch->htop_sort_key)) != 0 || + append_command_text(command, capacity, htop_sort_name(session->sort_key)) != 0 || append_command_text(command, capacity, " --cpu-start ") != 0 || - append_command_u32(command, capacity, ch->htop_cpu_start) != 0 || + append_command_u32(command, capacity, session->cpu_start) != 0 || append_command_text(command, capacity, " --cpu-count ") != 0 || - append_command_u32(command, capacity, ch->htop_cpu_count) != 0 || + append_command_u32(command, capacity, session->cpu_count) != 0 || append_command_text(command, capacity, " --process-start ") != 0 || - append_command_u32(command, capacity, ch->htop_process_start) != 0 || + append_command_u32(command, capacity, session->process_start) != 0 || append_command_text(command, capacity, " --selected ") != 0 || - append_command_u32(command, capacity, ch->htop_selected) != 0) { + append_command_u32(command, capacity, session->selected) != 0) { return -1; } if (append_command_text(command, capacity, - ch->htop_show_all != 0U ? " --all" : " --active") != + session->show_all != 0U ? " --all" : " --active") != 0) return -1; - if (ch->htop_show_cpus == 0U && + if (session->show_cpus == 0U && append_command_text(command, capacity, " --no-cpus") != 0) return -1; - if (ch->htop_reverse != 0U && + if (session->reverse != 0U && append_command_text(command, capacity, " --reverse") != 0) return -1; - if (ch->htop_filter_length != 0U && + if (session->filter_length != 0U && (append_command_text(command, capacity, " --filter ") != 0 || - append_command_text(command, capacity, ch->htop_filter) != 0)) return -1; + append_command_text(command, capacity, session->filter) != 0)) return -1; return 0; } @@ -758,51 +764,111 @@ int ssh_channel_agent_send(const ssh_channel_t *session, const uint8_t *data, data, len); } -static int htop_frame_ready(ssh_channel_t *ch, uint64_t now_ns) { +int xaios_htop_frame_ready(xaios_htop_session_t *session, uint64_t now_ns) { uint64_t earliest_ns; - if (ch->htop_last_frame_ns == 0U) return 1; - earliest_ns = ch->htop_last_frame_ns > UINT64_MAX - SSH_HTOP_MIN_FRAME_NS + if (session->last_frame_ns == 0U) return 1; + earliest_ns = session->last_frame_ns > UINT64_MAX - SSH_HTOP_MIN_FRAME_NS ? UINT64_MAX - : ch->htop_last_frame_ns + SSH_HTOP_MIN_FRAME_NS; + : session->last_frame_ns + SSH_HTOP_MIN_FRAME_NS; if (now_ns >= earliest_ns) return 1; - ch->htop_next_refresh_ns = earliest_ns; + session->next_refresh_ns = earliest_ns; return 0; } -static void htop_frame_sent(ssh_channel_t *ch, uint64_t now_ns) { - ch->htop_last_frame_ns = now_ns; +void xaios_htop_frame_sent(xaios_htop_session_t *session, uint64_t now_ns) { + session->last_frame_ns = now_ns; } -static int htop_render_frame(ssh_channel_t *ch, uint64_t now_ns) { - ssh_connection_t *connection; +int xaios_htop_render(xaios_htop_session_t *session, + const xaios_htop_sink_t *sink, uint64_t now_ns) { char command[256]; char output[8192]; u64 out_size = 0U; - int result; - if (ch == 0 || ch->htop_active == 0U || ch->pending_used != 0U) return 0; - if (htop_frame_ready(ch, now_ns) == 0) return 0; - connection = ssh_conn_find(ch->owner_sockfd); - if (connection == 0 || - connection->principal_role != XAIOS_CONTROL_ROLE_ADMIN || - htop_build_command(ch, command, sizeof(command)) != 0) { + if (session == 0 || sink == 0 || session->active == 0U) return 0; + if (sink->busy != 0 && sink->busy(sink->context) != 0) return 0; + if (xaios_htop_frame_ready(session, now_ns) == 0) return 0; + if (xaios_htop_build_command(session, command, sizeof(command)) != 0) { return -1; } - result = xaios_remote_login_session( - connection->sockfd, "admin", command, output, sizeof(output), &out_size); - if (result < 0 || out_size == 0U || out_size > sizeof(output)) return -1; - connection->remote_login_session_active = 1U; - connection->last_activity = now_ns; - if (ssh_channel_send_data((int)ch->owner_sockfd, ch->remote_id, - (const uint8_t *)output, - (uint32_t)out_size) != 0) return -1; - htop_frame_sent(ch, now_ns); - ch->htop_next_refresh_ns = - now_ns + (uint64_t)ch->htop_refresh_ms * UINT64_C(1000000); - if (ch->htop_next_refresh_ns < now_ns) ch->htop_next_refresh_ns = UINT64_MAX; + if (sink->run(sink->context, command, output, sizeof(output), &out_size) < 0 || + out_size == 0U || out_size > sizeof(output)) { + return -1; + } + if (sink->write(sink->context, (const uint8_t *)output, + (uint32_t)out_size) != 0) { + return -1; + } + xaios_htop_frame_sent(session, now_ns); + session->next_refresh_ns = + now_ns + (uint64_t)session->refresh_ms * UINT64_C(1000000); + if (session->next_refresh_ns < now_ns) session->next_refresh_ns = UINT64_MAX; return 0; } -static int htop_send_help(ssh_channel_t *ch, uint64_t now_ns) { +static int htop_handle_input(ssh_channel_t *ch, const uint8_t *data, + uint32_t length) { + xaios_htop_sink_t sink = channel_htop_sink(ch); + uint32_t was_active = ch->htop.active; + int result = xaios_htop_input(&ch->htop, &sink, xaios_clock_nanos(), data, + length); + if (result < 0) return -1; + if (was_active != 0U && ch->htop.active == 0U) { + if (ch->interactive_returns_to_shell != 0U && ch->shell_active != 0U) { + ch->interactive_returns_to_shell = 0U; + return shell_send_prompt(ch); + } + ch->close_after_flush = 1U; + return flush_channel(ch); + } + return 0; +} + +static int htop_render_frame(ssh_channel_t *ch, uint64_t now_ns) { + xaios_htop_sink_t sink = channel_htop_sink(ch); + return xaios_htop_render(&ch->htop, &sink, now_ns); +} + +/* The channel's own sink: writes through the SSH transport and runs the + sampling command against this connection's remote-login session. */ +static int channel_sink_write(void *context, const uint8_t *data, + uint32_t length) { + ssh_channel_t *ch = (ssh_channel_t *)context; + return ssh_channel_send_data((int)ch->owner_sockfd, ch->remote_id, + (const uint8_t *)data, (uint32_t)length); +} + +static int channel_sink_busy(void *context) { + ssh_channel_t *ch = (ssh_channel_t *)context; + return ch->pending_used != 0U ? 1 : 0; +} + +static int channel_sink_run(void *context, const char *command, char *output, + unsigned long long capacity, + unsigned long long *output_length) { + ssh_channel_t *ch = (ssh_channel_t *)context; + ssh_connection_t *connection = ssh_conn_find(ch->owner_sockfd); + if (connection == 0 || + connection->principal_role != XAIOS_CONTROL_ROLE_ADMIN) { + return -1; + } + int result = xaios_remote_login_session(connection->sockfd, "admin", command, + output, capacity, output_length); + if (result >= 0) connection->remote_login_session_active = 1U; + return result; +} + +static xaios_htop_sink_t channel_htop_sink(ssh_channel_t *ch) { + xaios_htop_sink_t sink; + sink.write = channel_sink_write; + sink.run = channel_sink_run; + sink.busy = channel_sink_busy; + sink.context = ch; + return sink; +} + +int xaios_htop_send_help(xaios_htop_session_t *session, + const xaios_htop_sink_t *sink, + uint64_t now_ns) { static const char help[] = "\033[2J\033[H\033[?25l\033[44;97m XAIOS htop help \033[0m\r\n\r\n" " Up/Down, j/k select process\r\n" @@ -819,18 +885,19 @@ static int htop_send_help(ssh_channel_t *ch, uint64_t now_ns) { "XAIOS exposes read-only process telemetry here. Generic kill and nice " "operations are unavailable because no safe process-control ABI exists.\r\n\r\n" "Press F1, h, Escape, or q to return.\033[0m"; - if (htop_frame_ready(ch, now_ns) == 0) return 0; - int result = ssh_channel_send_data((int)ch->owner_sockfd, ch->remote_id, - (const uint8_t *)help, - (uint32_t)(sizeof(help) - 1U)); + if (xaios_htop_frame_ready(session, now_ns) == 0) return 0; + int result = sink->write(sink->context, (const uint8_t *)help, + (uint32_t)(sizeof(help) - 1U)); if (result == 0) { - htop_frame_sent(ch, now_ns); - ch->htop_next_refresh_ns = UINT64_MAX; + xaios_htop_frame_sent(session, now_ns); + session->next_refresh_ns = UINT64_MAX; } return result; } -static int htop_send_filter_prompt(ssh_channel_t *ch, uint64_t now_ns) { +int xaios_htop_send_filter_prompt(xaios_htop_session_t *session, + const xaios_htop_sink_t *sink, + uint64_t now_ns) { char prompt[256]; uint32_t used = 0U; static const char prefix[] = @@ -838,33 +905,40 @@ static int htop_send_filter_prompt(ssh_channel_t *ch, uint64_t now_ns) { "Filter: "; static const char suffix[] = "\r\n\r\nType a single token. Enter applies, Backspace edits, Escape cancels.\r\n"; - if (htop_frame_ready(ch, now_ns) == 0) return 0; - if (sizeof(prefix) - 1U + ch->htop_filter_length + sizeof(suffix) - 1U > + if (xaios_htop_frame_ready(session, now_ns) == 0) return 0; + if (sizeof(prefix) - 1U + session->filter_length + sizeof(suffix) - 1U > sizeof(prompt)) return -1; ssh_mem_copy(prompt + used, prefix, sizeof(prefix) - 1U); used += sizeof(prefix) - 1U; - ssh_mem_copy(prompt + used, ch->htop_filter, ch->htop_filter_length); - used += ch->htop_filter_length; + ssh_mem_copy(prompt + used, session->filter, session->filter_length); + used += session->filter_length; ssh_mem_copy(prompt + used, suffix, sizeof(suffix) - 1U); used += sizeof(suffix) - 1U; - int result = ssh_channel_send_data((int)ch->owner_sockfd, ch->remote_id, - (const uint8_t *)prompt, used); + int result = sink->write(sink->context, (const uint8_t *)prompt, used); if (result == 0) { - htop_frame_sent(ch, now_ns); - ch->htop_next_refresh_ns = UINT64_MAX; + xaios_htop_frame_sent(session, now_ns); + session->next_refresh_ns = UINT64_MAX; } return result; } -static int htop_finish(ssh_channel_t *ch) { +int xaios_htop_stop(xaios_htop_session_t *session, + const xaios_htop_sink_t *sink) { static const char restore[] = "\033[0m\033[?25h\033[?1049l\033[0m\033[?25h\r"; - ch->htop_active = 0U; - ch->htop_help = 0U; - ch->htop_filter_mode = 0U; - if (ssh_channel_send_data((int)ch->owner_sockfd, ch->remote_id, - (const uint8_t *)restore, - (uint32_t)(sizeof(restore) - 1U)) != 0) return -1; + if (session == 0 || sink == 0) return -1; + session->active = 0U; + session->help = 0U; + session->filter_mode = 0U; + return sink->write(sink->context, (const uint8_t *)restore, + (uint32_t)(sizeof(restore) - 1U)); +} + +/* Channel lifecycle around the shared teardown: return to the shell that + launched htop, or close the channel when it was the only command. */ +static int htop_finish(ssh_channel_t *ch) { + xaios_htop_sink_t sink = channel_htop_sink(ch); + if (xaios_htop_stop(&ch->htop, &sink) != 0) return -1; if (ch->interactive_returns_to_shell != 0U && ch->shell_active != 0U) { ch->interactive_returns_to_shell = 0U; return shell_send_prompt(ch); @@ -893,19 +967,19 @@ static uint32_t htop_cpu_grid_columns(uint32_t cpu_count, return requested < maximum ? requested : maximum; } -static uint32_t htop_cpu_page(const ssh_channel_t *ch) { - uint32_t lines = ch->terminal_rows > 10U ? ch->terminal_rows - 10U : 1U; +static uint32_t htop_cpu_page(const xaios_htop_session_t *session) { + uint32_t lines = session->rows > 10U ? session->rows - 10U : 1U; if (lines > 8U) lines = 8U; - uint32_t columns = htop_cpu_max_columns(ch->terminal_columns); + uint32_t columns = htop_cpu_max_columns(session->columns); uint32_t visible = lines > UINT32_MAX / columns ? UINT32_MAX : lines * columns; - return ch->htop_cpu_count < visible ? ch->htop_cpu_count : visible; + return session->cpu_count < visible ? session->cpu_count : visible; } -static uint32_t htop_process_page(const ssh_channel_t *ch) { - uint32_t cpu_shown = ch->htop_show_cpus != 0U ? htop_cpu_page(ch) : 0U; +static uint32_t htop_process_page(const xaios_htop_session_t *session) { + uint32_t cpu_shown = session->show_cpus != 0U ? htop_cpu_page(session) : 0U; uint32_t grid_columns = - htop_cpu_grid_columns(cpu_shown, ch->terminal_columns); + htop_cpu_grid_columns(cpu_shown, session->columns); uint32_t cpu_lines = cpu_shown == 0U ? 0U : (cpu_shown + grid_columns - 1U) / grid_columns; @@ -913,45 +987,46 @@ static uint32_t htop_process_page(const ssh_channel_t *ch) { ? cpu_lines + 2U : cpu_lines + 3U; if (header_lines < 3U) header_lines = 3U; - return ch->terminal_rows > header_lines + 6U - ? ch->terminal_rows - header_lines - 6U : 1U; + return session->rows > header_lines + 6U + ? session->rows - header_lines - 6U : 1U; } -static int htop_handle_input(ssh_channel_t *ch, const uint8_t *data, - uint32_t length) { +int xaios_htop_input(xaios_htop_session_t *session, + const xaios_htop_sink_t *sink, uint64_t now_ns, + const uint8_t *data, uint32_t length) { int render = 0; for (uint32_t i = 0U; i < length; ++i) { uint8_t key = data[i]; - if (ch->htop_filter_mode != 0U) { + if (session->filter_mode != 0U) { if (key == 27U) { - ch->htop_filter_mode = 0U; - ch->htop_next_refresh_ns = 0U; + session->filter_mode = 0U; + session->next_refresh_ns = 0U; render = 1; } else if (key == '\r' || key == '\n') { - ch->htop_filter_mode = 0U; - ch->htop_process_start = 0U; - ch->htop_selected = 0U; - ch->htop_next_refresh_ns = 0U; - if (ch->pending_used == 0U && - htop_render_frame(ch, xaios_clock_nanos()) != 0) return -1; + session->filter_mode = 0U; + session->process_start = 0U; + session->selected = 0U; + session->next_refresh_ns = 0U; + if ((sink->busy == 0 || sink->busy(sink->context) == 0) && + xaios_htop_render(session, sink, now_ns) != 0) return -1; render = 0; } else if (key == 8U || key == 127U) { - if (ch->htop_filter_length != 0U) { - ch->htop_filter[--ch->htop_filter_length] = '\0'; + if (session->filter_length != 0U) { + session->filter[--session->filter_length] = '\0'; } - ch->htop_next_refresh_ns = 0U; - if (ch->pending_used == 0U && - htop_send_filter_prompt(ch, xaios_clock_nanos()) != 0) return -1; - } else if (ch->htop_filter_length + 1U < sizeof(ch->htop_filter) && + session->next_refresh_ns = 0U; + if ((sink->busy == 0 || sink->busy(sink->context) == 0) && + xaios_htop_send_filter_prompt(session, sink, now_ns) != 0) return -1; + } else if (session->filter_length + 1U < sizeof(session->filter) && ((key >= 'a' && key <= 'z') || (key >= 'A' && key <= 'Z') || (key >= '0' && key <= '9') || key == '_' || key == '-' || key == '.' || key == '/')) { - ch->htop_filter[ch->htop_filter_length++] = (char)key; - ch->htop_filter[ch->htop_filter_length] = '\0'; - ch->htop_next_refresh_ns = 0U; - if (ch->pending_used == 0U && - htop_send_filter_prompt(ch, xaios_clock_nanos()) != 0) return -1; + session->filter[session->filter_length++] = (char)key; + session->filter[session->filter_length] = '\0'; + session->next_refresh_ns = 0U; + if ((sink->busy == 0 || sink->busy(sink->context) == 0) && + xaios_htop_send_filter_prompt(session, sink, now_ns) != 0) return -1; } continue; } @@ -976,7 +1051,7 @@ static int htop_handle_input(ssh_channel_t *ch, const uint8_t *data, if (i + 4U < length && data[i + 4U] == '~') i += 2U; } else if (code == '2' && i + 4U < length && data[i + 3U] == '1' && data[i + 4U] == '~') { - return htop_finish(ch); + return xaios_htop_stop(session, sink); } i += 2U; } else if (key == 27U && i + 2U < length && data[i + 1U] == 'O' && @@ -985,115 +1060,115 @@ static int htop_handle_input(ssh_channel_t *ch, const uint8_t *data, i += 2U; } - if (ch->htop_help != 0U) { + if (session->help != 0U) { if (key == 'h' || key == 'q' || key == 27U) { - ch->htop_help = 0U; - ch->htop_next_refresh_ns = 0U; + session->help = 0U; + session->next_refresh_ns = 0U; render = 1; } continue; } - if (key == 'q' || key == 3U) return htop_finish(ch); + if (key == 'q' || key == 3U) return xaios_htop_stop(session, sink); if (key == 'h') { - ch->htop_help = 1U; - ch->htop_next_refresh_ns = 0U; - if (ch->pending_used == 0U && - htop_send_help(ch, xaios_clock_nanos()) != 0) return -1; + session->help = 1U; + session->next_refresh_ns = 0U; + if ((sink->busy == 0 || sink->busy(sink->context) == 0) && + xaios_htop_send_help(session, sink, now_ns) != 0) return -1; } else if (key == '/' ) { - ch->htop_filter_mode = 1U; - ch->htop_filter_length = 0U; - ch->htop_filter[0] = '\0'; - ch->htop_next_refresh_ns = 0U; - if (ch->pending_used == 0U && - htop_send_filter_prompt(ch, xaios_clock_nanos()) != 0) return -1; + session->filter_mode = 1U; + session->filter_length = 0U; + session->filter[0] = '\0'; + session->next_refresh_ns = 0U; + if ((sink->busy == 0 || sink->busy(sink->context) == 0) && + xaios_htop_send_filter_prompt(session, sink, now_ns) != 0) return -1; } else if (key == 'x') { - ch->htop_filter_length = 0U; - ch->htop_filter[0] = '\0'; - ch->htop_process_start = 0U; - ch->htop_selected = 0U; + session->filter_length = 0U; + session->filter[0] = '\0'; + session->process_start = 0U; + session->selected = 0U; render = 1; } else if (key == 'j') { - ++ch->htop_selected; - if (ch->htop_selected >= - ch->htop_process_start + htop_process_page(ch)) { - ++ch->htop_process_start; + ++session->selected; + if (session->selected >= + session->process_start + htop_process_page(session)) { + ++session->process_start; } render = 1; } else if (key == 'k') { - if (ch->htop_selected != 0U) --ch->htop_selected; - if (ch->htop_selected < ch->htop_process_start) { - ch->htop_process_start = ch->htop_selected; + if (session->selected != 0U) --session->selected; + if (session->selected < session->process_start) { + session->process_start = session->selected; } render = 1; } else if (key == 'D') { - uint32_t page = htop_process_page(ch); - ch->htop_selected += page; - ch->htop_process_start += page; + uint32_t page = htop_process_page(session); + session->selected += page; + session->process_start += page; render = 1; } else if (key == 'U') { - uint32_t page = htop_process_page(ch); - ch->htop_selected = ch->htop_selected > page ? ch->htop_selected - page : 0U; - ch->htop_process_start = ch->htop_process_start > page - ? ch->htop_process_start - page : 0U; + uint32_t page = htop_process_page(session); + session->selected = session->selected > page ? session->selected - page : 0U; + session->process_start = session->process_start > page + ? session->process_start - page : 0U; render = 1; } else if (key == 'P') { - ch->htop_sort_key = SSH_HTOP_SORT_CPU; + session->sort_key = SSH_HTOP_SORT_CPU; render = 1; } else if (key == 'M') { - ch->htop_sort_key = SSH_HTOP_SORT_MEMORY; + session->sort_key = SSH_HTOP_SORT_MEMORY; render = 1; } else if (key == 'T') { - ch->htop_sort_key = SSH_HTOP_SORT_TIME; + session->sort_key = SSH_HTOP_SORT_TIME; render = 1; } else if (key == 'N') { - ch->htop_sort_key = SSH_HTOP_SORT_PID; + session->sort_key = SSH_HTOP_SORT_PID; render = 1; } else if (key == 'S') { - ch->htop_sort_key = SSH_HTOP_SORT_SYSCALLS; + session->sort_key = SSH_HTOP_SORT_SYSCALLS; render = 1; } else if (key == 'C') { - ch->htop_sort_key = SSH_HTOP_SORT_COMMAND; + session->sort_key = SSH_HTOP_SORT_COMMAND; render = 1; } else if (key == 'F') { - ch->htop_sort_key = (ch->htop_sort_key + 1U) % 7U; + session->sort_key = (session->sort_key + 1U) % 7U; render = 1; } else if (key == 'I') { - ch->htop_reverse ^= 1U; + session->reverse ^= 1U; render = 1; } else if (key == 't') { - ch->htop_sort_key = ch->htop_sort_key == SSH_HTOP_SORT_PARENT + session->sort_key = session->sort_key == SSH_HTOP_SORT_PARENT ? SSH_HTOP_SORT_CPU : SSH_HTOP_SORT_PARENT; render = 1; } else if (key == 'a') { - ch->htop_show_all ^= 1U; + session->show_all ^= 1U; render = 1; } else if (key == '1') { - ch->htop_show_cpus ^= 1U; + session->show_cpus ^= 1U; render = 1; } else if (key == '[') { - uint32_t page = htop_cpu_page(ch); - ch->htop_cpu_start = ch->htop_cpu_start > page - ? ch->htop_cpu_start - page : 0U; + uint32_t page = htop_cpu_page(session); + session->cpu_start = session->cpu_start > page + ? session->cpu_start - page : 0U; render = 1; } else if (key == ']') { - uint32_t page = htop_cpu_page(ch); - if (UINT32_MAX - ch->htop_cpu_start >= page) { - ch->htop_cpu_start += page; + uint32_t page = htop_cpu_page(session); + if (UINT32_MAX - session->cpu_start >= page) { + session->cpu_start += page; } render = 1; } else if (key == '+') { - if (ch->htop_refresh_ms > SSH_HTOP_MIN_REFRESH_MS) { - ch->htop_refresh_ms /= 2U; - if (ch->htop_refresh_ms < SSH_HTOP_MIN_REFRESH_MS) { - ch->htop_refresh_ms = SSH_HTOP_MIN_REFRESH_MS; + if (session->refresh_ms > SSH_HTOP_MIN_REFRESH_MS) { + session->refresh_ms /= 2U; + if (session->refresh_ms < SSH_HTOP_MIN_REFRESH_MS) { + session->refresh_ms = SSH_HTOP_MIN_REFRESH_MS; } } render = 1; } else if (key == '-') { - if (ch->htop_refresh_ms < SSH_HTOP_MAX_REFRESH_MS) { - ch->htop_refresh_ms *= 2U; - if (ch->htop_refresh_ms > SSH_HTOP_MAX_REFRESH_MS) { - ch->htop_refresh_ms = SSH_HTOP_MAX_REFRESH_MS; + if (session->refresh_ms < SSH_HTOP_MAX_REFRESH_MS) { + session->refresh_ms *= 2U; + if (session->refresh_ms > SSH_HTOP_MAX_REFRESH_MS) { + session->refresh_ms = SSH_HTOP_MAX_REFRESH_MS; } } render = 1; @@ -1101,8 +1176,8 @@ static int htop_handle_input(ssh_channel_t *ch, const uint8_t *data, render = 1; } } - if (render != 0 && ch->htop_active != 0U && ch->pending_used == 0U) { - return htop_render_frame(ch, xaios_clock_nanos()); + if (render != 0 && session->active != 0U && (sink->busy == 0 || sink->busy(sink->context) == 0)) { + return xaios_htop_render(session, sink, now_ns); } return 0; } @@ -1157,7 +1232,8 @@ static int shell_start_htop(ssh_channel_t *ch, char *command) { } return shell_send_prompt(ch); } - htop_initialize(ch, command); + xaios_htop_start(&ch->htop, command, ch->terminal_columns, + ch->terminal_rows); ch->interactive_returns_to_shell = 1U; if (ssh_channel_send_data((int)ch->owner_sockfd, ch->remote_id, (const uint8_t *)enter_screen, @@ -1168,9 +1244,9 @@ static int shell_start_htop(ssh_channel_t *ch, char *command) { return -1; } uint64_t now_ns = xaios_clock_nanos(); - htop_frame_sent(ch, now_ns); - ch->htop_next_refresh_ns = - now_ns + (uint64_t)ch->htop_refresh_ms * UINT64_C(1000000); + xaios_htop_frame_sent(&ch->htop, now_ns); + ch->htop.next_refresh_ns = + now_ns + (uint64_t)ch->htop.refresh_ms * UINT64_C(1000000); return 0; } @@ -1472,7 +1548,7 @@ static int shell_handle_input(ssh_channel_t *ch, const uint8_t *data, ch->shell_ignore_lf = value == '\r' ? 1U : 0U; if (shell_execute_line(ch) != 0) return -1; if (ch->shell_active == 0U) return 0; - if (ch->htop_active != 0U) { + if (ch->htop.active != 0U) { return i + 1U < length ? htop_handle_input(ch, data + i + 1U, length - i - 1U) : 0; @@ -1557,17 +1633,19 @@ int ssh_channel_tick(uint64_t now_ns) { ch->exit_status = 1U; if (pong_finish(ch, 1U) != 0) return -1; } - if (ch->active == 0U || ch->htop_active == 0U || + if (ch->active == 0U || ch->htop.active == 0U || ch->pending_used != 0U || - now_ns < ch->htop_next_refresh_ns) { + now_ns < ch->htop.next_refresh_ns) { continue; } - if (ch->htop_help != 0U) { - if (htop_send_help(ch, now_ns) != 0) return -1; + if (ch->htop.help != 0U) { + xaios_htop_sink_t sink = channel_htop_sink(ch); + if (xaios_htop_send_help(&ch->htop, &sink, now_ns) != 0) return -1; continue; } - if (ch->htop_filter_mode != 0U) { - if (htop_send_filter_prompt(ch, now_ns) != 0) return -1; + if (ch->htop.filter_mode != 0U) { + xaios_htop_sink_t sink = channel_htop_sink(ch); + if (xaios_htop_send_filter_prompt(&ch->htop, &sink, now_ns) != 0) return -1; continue; } if (htop_render_frame(ch, now_ns) != 0) { @@ -1611,7 +1689,7 @@ static int handle_channel_request(int sockfd, const ssh_packet_t *pkt) { if (ssh_str_eq(request_type, "window-change")) { int valid = parse_window_change(ch, pkt, data_start) == 0; - if (valid && ch->htop_active != 0U) ch->htop_next_refresh_ns = 0U; + if (valid && ch->htop.active != 0U) ch->htop.next_refresh_ns = 0U; if (valid && ch->nano.active != 0U) { nano_editor_resize(&ch->nano, ch->terminal_columns, ch->terminal_rows); if (nano_render_frame(ch) != 0) return -1; @@ -1732,7 +1810,8 @@ static int handle_channel_request(int sockfd, const ssh_packet_t *pkt) { ch->close_after_flush = 1U; return flush_channel(ch); } - htop_initialize(ch, command); + xaios_htop_start(&ch->htop, command, ch->terminal_columns, + ch->terminal_rows); if (ssh_channel_send_data(sockfd, ch->remote_id, (const uint8_t *)enter_screen, (uint32_t)(sizeof(enter_screen) - 1U)) != 0) { @@ -1744,10 +1823,10 @@ static int handle_channel_request(int sockfd, const ssh_packet_t *pkt) { return -1; } uint64_t now_ns = xaios_clock_nanos(); - htop_frame_sent(ch, now_ns); - ch->htop_next_refresh_ns = + xaios_htop_frame_sent(&ch->htop, now_ns); + ch->htop.next_refresh_ns = now_ns + - (uint64_t)ch->htop_refresh_ms * UINT64_C(1000000); + (uint64_t)ch->htop.refresh_ms * UINT64_C(1000000); return 0; } @@ -2028,7 +2107,7 @@ int ssh_channel_handle_packet(int sockfd, const ssh_packet_t *pkt) { return 0; } - if (ch->htop_active != 0U) { + if (ch->htop.active != 0U) { return htop_handle_input(ch, pkt->data + 9U, data_len); } @@ -2109,7 +2188,7 @@ int ssh_channel_handle_packet(int sockfd, const ssh_packet_t *pkt) { ch->close_after_flush = 1U; return flush_channel(ch); } - if (ch->htop_active != 0U) return htop_finish(ch); + if (ch->htop.active != 0U) return htop_finish(ch); if (ch->nano.active != 0U) return nano_finish(ch, 0U); if (ch->less.active != 0U) return less_finish(ch, 0U); if (ch->pong.active != 0U) return pong_finish(ch, 0U); diff --git a/userspace/sshd/ssh_channel.h b/userspace/sshd/ssh_channel.h index a11daa03..84300848 100644 --- a/userspace/sshd/ssh_channel.h +++ b/userspace/sshd/ssh_channel.h @@ -5,6 +5,70 @@ #include "less_pager.h" #include "nano_editor.h" #include "pong_game.h" + +/* Interactive process-monitor session state. + Held apart from the transport so the SSH channel and the local console can + drive the same state machine instead of each keeping their own copy, which + is what let the two surfaces disagree about how htop behaves. */ +typedef struct xaios_htop_session { + uint32_t active; + uint32_t show_all; + uint32_t show_cpus; + uint32_t sort_key; + uint32_t reverse; + uint32_t cpu_start; + uint32_t cpu_count; + uint32_t process_start; + uint32_t selected; + uint32_t refresh_ms; + uint32_t filter_mode; + uint32_t help; + uint32_t filter_length; + uint32_t columns; + uint32_t rows; + uint64_t last_frame_ns; + uint64_t next_refresh_ns; + char filter[32]; +} xaios_htop_session_t; + +/* Where an htop session sends output and how it runs a sampling command. + The SSH channel fills this in with its own transport, the local console with + direct console writes, so both drive the identical session logic. */ +typedef struct xaios_htop_sink { + int (*write)(void *context, const uint8_t *data, uint32_t length); + int (*run)(void *context, const char *command, char *output, + unsigned long long capacity, + unsigned long long *output_length); + int (*busy)(void *context); + void *context; +} xaios_htop_sink_t; + +void xaios_htop_start(xaios_htop_session_t *session, const char *command, + uint32_t columns, uint32_t rows); +int xaios_htop_build_command(const xaios_htop_session_t *session, + char *command, uint32_t capacity); +int xaios_htop_frame_ready(xaios_htop_session_t *session, + uint64_t now_ns); +void xaios_htop_frame_sent(xaios_htop_session_t *session, + uint64_t now_ns); +int xaios_htop_render(xaios_htop_session_t *session, + const xaios_htop_sink_t *sink, uint64_t now_ns); +int xaios_htop_send_help(xaios_htop_session_t *session, + const xaios_htop_sink_t *sink, + uint64_t now_ns); +int xaios_htop_send_filter_prompt(xaios_htop_session_t *session, + const xaios_htop_sink_t *sink, + uint64_t now_ns); +/* Writes the terminal restore sequence and clears the session. Surface + lifecycle (returning to a shell, closing a channel) stays with the caller. */ +int xaios_htop_stop(xaios_htop_session_t *session, + const xaios_htop_sink_t *sink); +/* Returns negative on error. The session ends by clearing session->active, + which the caller checks so it can run its own teardown -- returning to a + shell, closing a channel, or reprinting the console prompt. */ +int xaios_htop_input(xaios_htop_session_t *session, + const xaios_htop_sink_t *sink, uint64_t now_ns, + const unsigned char *data, uint32_t length); #include "ssh_protocol.h" #define SSH_CHANNELS_PER_CONNECTION 2U @@ -40,27 +104,12 @@ typedef struct ssh_channel { uint32_t pty_requested; uint32_t terminal_columns; uint32_t terminal_rows; - uint32_t htop_active; - uint32_t htop_show_all; - uint32_t htop_show_cpus; - uint32_t htop_sort_key; - uint32_t htop_reverse; - uint32_t htop_cpu_start; - uint32_t htop_cpu_count; - uint32_t htop_process_start; - uint32_t htop_selected; - uint32_t htop_refresh_ms; - uint32_t htop_filter_mode; - uint32_t htop_help; - uint32_t htop_filter_length; + xaios_htop_session_t htop; uint32_t shell_active; uint32_t shell_line_length; uint32_t shell_ignore_lf; uint32_t ssh_client_slot; uint32_t interactive_returns_to_shell; - uint64_t htop_last_frame_ns; - uint64_t htop_next_refresh_ns; - char htop_filter[32]; char shell_line[SSH_CHANNEL_SHELL_LINE_SIZE]; nano_editor_t nano; less_pager_t less; diff --git a/userspace/sshd/sshd.c b/userspace/sshd/sshd.c index b5e847f5..c5be0c2d 100644 --- a/userspace/sshd/sshd.c +++ b/userspace/sshd/sshd.c @@ -652,6 +652,99 @@ static int console_start_pong(void) { return 0; } +/* Local console htop session. + Drives the same xaios_htop_session_t state machine the SSH channel uses, so + refresh cadence, sort keys, filtering, help and quit behave identically on + both surfaces. Only the sink differs: bytes go straight to the console and + sampling runs against the console's own remote-login session. */ +/* "htop" with or without options, but not "htop --plain": that form asks for + the snapshot output on purpose, on either surface. */ +static int console_command_is_htop(const char *command) { + static const char name[] = "htop"; + uint32_t i = 0U; + if (command == 0) return 0; + for (; i < sizeof(name) - 1U; ++i) { + if (command[i] != name[i]) return 0; + } + if (command[i] != '\0' && command[i] != ' ') return 0; + for (uint32_t j = i; command[j] != '\0'; ++j) { + if (command[j] == '-' && command[j + 1U] == '-' && + command[j + 2U] == 'p' && command[j + 3U] == 'l' && + command[j + 4U] == 'a' && command[j + 5U] == 'i' && + command[j + 6U] == 'n') { + return 0; + } + } + return 1; +} + +static xaios_htop_session_t g_console_htop; + +static int console_htop_write(void *context, const uint8_t *data, + uint32_t length) { + (void)context; + /* console_write_bytes reports success as 0, not a byte count. */ + return console_write_bytes((const char *)data, length); +} + +static int console_htop_run(void *context, const char *command, char *output, + unsigned long long capacity, + unsigned long long *output_length) { + (void)context; + return xaios_remote_login_session(SSHD_CONSOLE_SESSION_ID, "admin", command, + output, capacity, output_length); +} + +static xaios_htop_sink_t console_htop_sink(void) { + xaios_htop_sink_t sink; + sink.write = console_htop_write; + sink.run = console_htop_run; + sink.busy = 0; + sink.context = 0; + return sink; +} + +static void console_finish_htop(void) { + xaios_htop_sink_t sink = console_htop_sink(); + (void)xaios_htop_stop(&g_console_htop, &sink); + console_prompt(); +} + +static int console_start_htop(const char *command) { + xaios_htop_sink_t sink = console_htop_sink(); + xaios_htop_start(&g_console_htop, command, SSHD_CONSOLE_COLUMNS, + SSHD_CONSOLE_ROWS); + console_write("\033[?1049h\033[?25l"); + if (xaios_htop_render(&g_console_htop, &sink, xaios_clock_nanos()) != 0) { + console_finish_htop(); + return -1; + } + return 0; +} + +static void console_service_htop(uint64_t now_ns) { + xaios_htop_sink_t sink = console_htop_sink(); + if (g_console_htop.active == 0U) return; + if (g_console_htop.help != 0U) { + if (now_ns >= g_console_htop.next_refresh_ns && + xaios_htop_send_help(&g_console_htop, &sink, now_ns) != 0) { + console_finish_htop(); + } + return; + } + if (g_console_htop.filter_mode != 0U) { + if (now_ns >= g_console_htop.next_refresh_ns && + xaios_htop_send_filter_prompt(&g_console_htop, &sink, now_ns) != 0) { + console_finish_htop(); + } + return; + } + if (now_ns >= g_console_htop.next_refresh_ns && + xaios_htop_render(&g_console_htop, &sink, now_ns) != 0) { + console_finish_htop(); + } +} + static void console_finish_pong(void) { g_console_pong.active = 0U; console_write("\033[0m\033[?25h\033[?1049l\033[0m\033[?25h\r"); @@ -720,6 +813,8 @@ static void console_execute_command(void) { (void)console_start_nano(g_console_command); } else if (ssh_str_eq(g_console_command, "pong")) { (void)console_start_pong(); + } else if (console_command_is_htop(g_console_command)) { + (void)console_start_htop(g_console_command); } else if (ssh_str_eq(g_console_command, "clear")) { console_write("\x1b[2J\x1b[H"); } else if (ssh_str_eq(g_console_command, "exit") || @@ -755,7 +850,8 @@ static void console_execute_command(void) { } } g_console_command_length = 0U; - if (g_console_nano.active == 0U && g_console_pong.active == 0U) + if (g_console_nano.active == 0U && g_console_pong.active == 0U && + g_console_htop.active == 0U) console_prompt(); } @@ -865,6 +961,15 @@ static void console_tick(void) { } continue; } + if (g_console_htop.active != 0U) { + xaios_htop_sink_t sink = console_htop_sink(); + (void)xaios_htop_input(&g_console_htop, &sink, xaios_clock_nanos(), + (const uint8_t *)&value, 1U); + /* The session signals it is finished by clearing active; the surface + then does its own teardown, here reprinting the shell prompt. */ + if (g_console_htop.active == 0U) console_prompt(); + continue; + } if (g_console_pong.active != 0U) { uint32_t should_exit = 0U; uint64_t now_ns = xaios_clock_nanos(); @@ -2474,6 +2579,7 @@ int sshd_run(void) { uint64_t now = timer_now(); console_refresh_boot_ui(now); console_service_pong(now); + console_service_htop(now); console_tick(); for (uint32_t i = 0; g_console_ssh_ready != 0U && i < 4U; ++i) { uint8_t udp_buffer[1478]; From 1d8542a3bdd56115b562c1d3a8ceb2b63756c0d5 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Andr=C3=A9=20Borchert?= Date: Sun, 23 Aug 2026 19:17:20 +0700 Subject: [PATCH 05/16] Give the local console the pager it was missing nano and pong were already shared: both surfaces drive the same nano_editor_t and pong_game_t, so they behave identically without anything further. less was not. The pager existed only on the SSH channel, so "less FILE" on the local console fell through to the generic command path and dumped the file instead of paging it -- the same split htop had. less_pager_t is surface independent already, with open, render, input, resize and close, so this is wiring rather than a refactor. The console holds a pager, starts it from the same command form the channel accepts, routes keystrokes to less_pager_input, redraws from less_pager_render, and restores the screen and prompt on quit, exactly as it does for nano. That leaves every interactive application on one implementation across both consoles: nano and pong through their shared components, htop through the session extracted previously, and now less. Verified: on the local console "less /tmp/pager.txt" enters the alternate screen, renders the file with tilde filler, quits on q and returns a working shell. qemu-smoke, qemu-local-console-gate and the documentation contract pass. Co-Authored-By: Claude Opus 5 --- userspace/sshd/sshd.c | 61 ++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 60 insertions(+), 1 deletion(-) diff --git a/userspace/sshd/sshd.c b/userspace/sshd/sshd.c index c5be0c2d..57167842 100644 --- a/userspace/sshd/sshd.c +++ b/userspace/sshd/sshd.c @@ -7,6 +7,7 @@ #include "ssh_mlkem.h" #include "ssh_utils.h" #include "tweetnacl_subset.h" +#include "less_pager.h" #include "nano_editor.h" #include "pong_game.h" #include @@ -40,6 +41,7 @@ static uint32_t g_console_ssh_ready; static int32_t g_console_boot_error; static nano_editor_t g_console_nano; static pong_game_t g_console_pong; +static less_pager_t g_console_less; static uint32_t g_console_auth_state; static uint32_t g_console_auth_failures; static uint64_t g_console_ui_next_refresh; @@ -572,6 +574,43 @@ static int console_nano_argument(const char *command, char *argument, return 0; } +/* Local console pager, driving the same less_pager_t the SSH channel uses so + paging, searching and quitting behave identically on both surfaces. */ +static int console_start_less(const char *command) { + char cwd[LESS_PAGER_PATH_MAX]; + u64 cwd_size = 0U; + uint32_t frame_size = 0U; + if (xaios_remote_login_session(SSHD_CONSOLE_SESSION_ID, "admin", "pwd", cwd, + sizeof(cwd), &cwd_size) < 0 || + cwd_size == 0U || cwd_size >= sizeof(cwd)) { + return -1; + } + while (cwd_size != 0U && + (cwd[cwd_size - 1U] == '\n' || cwd[cwd_size - 1U] == '\r')) { + cwd[--cwd_size] = '\0'; + } + if (less_pager_open(&g_console_less, command, cwd, SSHD_CONSOLE_COLUMNS, + SSHD_CONSOLE_ROWS) != 0) { + console_write( + "less: usage: less [-N] FILE (regular files up to 128 KiB)\n"); + return -1; + } + if (less_pager_render(&g_console_less, g_console_output, + sizeof(g_console_output), &frame_size) != 0) { + less_pager_close(&g_console_less); + return -1; + } + console_write("\033[?1049h\033[?25l"); + (void)console_write_bytes(g_console_output, frame_size); + return 0; +} + +static void console_finish_less(void) { + less_pager_close(&g_console_less); + console_write("\033[0m\033[?25h\033[?1049l\033[0m\033[?25h\r"); + console_prompt(); +} + static int console_start_nano(const char *command) { char argument[NANO_EDITOR_PATH_MAX]; char cwd[NANO_EDITOR_PATH_MAX]; @@ -813,6 +852,10 @@ static void console_execute_command(void) { (void)console_start_nano(g_console_command); } else if (ssh_str_eq(g_console_command, "pong")) { (void)console_start_pong(); + } else if (g_console_command[0] == 'l' && g_console_command[1] == 'e' && + g_console_command[2] == 's' && g_console_command[3] == 's' && + (g_console_command[4] == '\0' || g_console_command[4] == ' ')) { + (void)console_start_less(g_console_command); } else if (console_command_is_htop(g_console_command)) { (void)console_start_htop(g_console_command); } else if (ssh_str_eq(g_console_command, "clear")) { @@ -851,7 +894,7 @@ static void console_execute_command(void) { } g_console_command_length = 0U; if (g_console_nano.active == 0U && g_console_pong.active == 0U && - g_console_htop.active == 0U) + g_console_htop.active == 0U && g_console_less.active == 0U) console_prompt(); } @@ -961,6 +1004,22 @@ static void console_tick(void) { } continue; } + if (g_console_less.active != 0U) { + uint32_t frame_size = 0U; + uint32_t should_exit = 0U; + if (less_pager_input(&g_console_less, (const uint8_t *)&value, 1U, + &should_exit) != 0) { + should_exit = 1U; + } + if (should_exit != 0U) { + console_finish_less(); + } else if (less_pager_render(&g_console_less, g_console_output, + sizeof(g_console_output), + &frame_size) == 0) { + (void)console_write_bytes(g_console_output, frame_size); + } + continue; + } if (g_console_htop.active != 0U) { xaios_htop_sink_t sink = console_htop_sink(); (void)xaios_htop_input(&g_console_htop, &sink, xaios_clock_nanos(), From 143d4fcb78ed896ca698f78f6096e5f85a54b4fe Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Andr=C3=A9=20Borchert?= Date: Sun, 23 Aug 2026 19:30:49 +0700 Subject: [PATCH 06/16] Update the syscall budget and fix a stub that only built on macOS Both failures came from putting parser-fuzz and the libc contract in front of the new net_local_ipv6 syscall, and both are worth having found. The libc contract pins the syscall count so the C99 profile cannot quietly grow the ABI. Recording net_local_ipv6 moves the budget from 50 to 51, matching the frozen release-candidate contract. The success line printed the count as literal text, so it would have kept claiming 50 forever; it now reads the budget it just checked. The fuzz stubs declared xaios_net_recv, xaios_net_send and xaios_clock_nanos with uint64_t where xaios_user.h declares u64. Those agree on macOS, where uint64_t is unsigned long long, and conflict on Linux, where it is unsigned long. The stubs had therefore only ever compiled on a development host -- nothing noticed, because parser-fuzz had never run in CI. Adding the job surfaced it on its first run. Verified: check-libc-contract, run-parser-fuzz, the ABI contract and the documentation contract all pass. Co-Authored-By: Claude Opus 5 --- tests/fuzz/ssh_protocol_stubs.c | 11 ++++--- tests/libc/c99-requirements.json | 47 ++++++++++++++++++++++------ tests/scripts/check-libc-contract.py | 3 +- 3 files changed, 46 insertions(+), 15 deletions(-) diff --git a/tests/fuzz/ssh_protocol_stubs.c b/tests/fuzz/ssh_protocol_stubs.c index 858cb3dd..838a5e83 100644 --- a/tests/fuzz/ssh_protocol_stubs.c +++ b/tests/fuzz/ssh_protocol_stubs.c @@ -23,19 +23,20 @@ int ssh_conn_recv(ssh_connection_t *conn, uint8_t *data, u64 length, return -1; } -int xaios_net_recv(uint64_t socket, void *buffer, uint64_t size, - uint64_t *received) { +/* Match xaios_user.h exactly. uint64_t is unsigned long long on macOS but + unsigned long on Linux, so spelling these with uint64_t compiled on a + development host and conflicted on CI. */ +int xaios_net_recv(u64 socket, void *buffer, u64 size, u64 *received) { (void)socket; (void)buffer; (void)size; (void)received; return -1; } -int xaios_net_send(uint64_t socket, const void *buffer, uint64_t size, - uint64_t *sent) { +int xaios_net_send(u64 socket, const void *buffer, u64 size, u64 *sent) { (void)socket; (void)buffer; (void)size; (void)sent; return -1; } -uint64_t xaios_clock_nanos(void) { return 0U; } +u64 xaios_clock_nanos(void) { return 0U; } void xaios_log(const char *message) { (void)message; } int crypto_random_bytes(uint8_t *output, uint32_t len) { (void)output; (void)len; return -1; diff --git a/tests/libc/c99-requirements.json b/tests/libc/c99-requirements.json index f00f364d..a98facf4 100644 --- a/tests/libc/c99-requirements.json +++ b/tests/libc/c99-requirements.json @@ -30,7 +30,10 @@ "wchar.h", "wctype.h" ], - "architecture_gates": ["aarch64", "x86_64"], + "architecture_gates": [ + "aarch64", + "x86_64" + ], "required_macros": { "__STDC_HOSTED__": "1", "__STDC_VERSION__": "199901L" @@ -48,13 +51,39 @@ "strings.h" ], "forbidden_public_identifiers": [ - "accept", "asprintf", "close", "connect", "execve", "fdopen", - "fileno", "fmemopen", "fork", "gettimeofday", "lseek", "mmap", - "munmap", "nanosleep", "open", "poll", "pthread_create", "read", - "setbuffer", "setlinebuf", "socket", "stat", "strfromd", - "timespec_get", "unlink", "valloc", "vasprintf", "write" + "accept", + "asprintf", + "close", + "connect", + "execve", + "fdopen", + "fileno", + "fmemopen", + "fork", + "gettimeofday", + "lseek", + "mmap", + "munmap", + "nanosleep", + "open", + "poll", + "pthread_create", + "read", + "setbuffer", + "setlinebuf", + "socket", + "stat", + "strfromd", + "timespec_get", + "unlink", + "valloc", + "vasprintf", + "write" + ], + "forbidden_public_macros": [ + "SIGUSR1", + "TIME_UTC" ], - "forbidden_public_macros": ["SIGUSR1", "TIME_UTC"], "runtime_markers": [ "C99-LANGUAGE-PASS", "C99-TYPES-MACROS-PASS", @@ -76,8 +105,8 @@ "kernel: /bin/c99-thread-context returned to kernel exit_code=0" ], "syscall_budget": { - "baseline_count": 50, - "maximum_identifier": 50, + "baseline_count": 51, + "maximum_identifier": 51, "libc_specific_additions": 0 } } diff --git a/tests/scripts/check-libc-contract.py b/tests/scripts/check-libc-contract.py index a5620b60..d3f825a1 100755 --- a/tests/scripts/check-libc-contract.py +++ b/tests/scripts/check-libc-contract.py @@ -206,7 +206,8 @@ def main() -> int: check_sysroot(arch) print( "libc-contract: PASS: 24 headers, 464 functions, exact strict-C99 " - "namespace, pinned source, non-POSIX surface, 50-syscall budget" + f"namespace, pinned source, non-POSIX surface, " + f"{REQUIREMENTS['syscall_budget']['baseline_count']}-syscall budget" ) return 0 From c3c98795c65865085ab07b518016f09ea0751501 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Andr=C3=A9=20Borchert?= Date: Sun, 23 Aug 2026 20:25:24 +0700 Subject: [PATCH 07/16] Serialise the VFS handle table and fix the fuzz build on Linux The FreeBSD gate kept failing an SFTP close with fs-close-denied even after process resources moved off the reusable pid. The layer above was the problem: vfs.c had no mutual exclusion at all. vfs_open scans the handle table for a free slot and fills it in separate steps, while vfs_close and vfs_release_owner clear entries, all reachable from every CPU through the filesystem syscalls. MutableFS was serialised earlier; the table in front of it was not. Each public entry point now takes one lock around its body, renamed *_locked. The internal cross-calls use the locked forms so a non-recursive lock cannot re-enter: vfs_read and vfs_write through vfs_pread and vfs_pwrite, and vfs_delete through vfs_stat, vfs_rmdir and vfs_unlink. Lock order runs one way only -- a VFS entry point may call a backend that takes the MutableFS lock, and MutableFS never calls back into the VFS -- so the two cannot invert. parser-fuzz also could not build on Linux. The DNS target compiles BearSSL, whose sysrng.c calls getentropy(), which glibc hides under -std=c99 without _DEFAULT_SOURCE, and openbsd-compat uses __nonstring__, unknown to clang before 21. Both are already handled in scripts/build-image.sh and the hosted test build; the fuzz build now passes the same two flags. As with the stub type mismatch, this only ever built on a development host, and adding the job to CI is what surfaced it. Verified: qemu-smoke, qemu-local-console-gate, qemu-storage-crash-test, compile-check, run-parser-fuzz and the documentation contract pass, and the FreeBSD bidirectional suite passes end to end locally. Noted but not addressed: one suite run failed earlier with "persistent mount skipped status=-4" after formatting a fresh volume, and passed on re-run. That is an intermittent failure in the persistent mount path, separate from this change, and it now has kernel diagnostics captured when it recurs. Co-Authored-By: Claude Opus 5 --- kernel/fs/vfs.c | 220 ++++++++++++++++++++++++++----- tests/scripts/run-parser-fuzz.py | 7 + 2 files changed, 193 insertions(+), 34 deletions(-) diff --git a/kernel/fs/vfs.c b/kernel/fs/vfs.c index d8be4382..7a91f25c 100644 --- a/kernel/fs/vfs.c +++ b/kernel/fs/vfs.c @@ -1,4 +1,5 @@ #include +#include typedef struct vfs_mount_record { uint32_t active; @@ -21,6 +22,7 @@ typedef struct vfs_handle_record { } vfs_handle_record_t; static vfs_mount_record_t g_mounts[XAIOS_VFS_MAX_MOUNTS]; +static xaios_spinlock_t g_vfs_lock = XAIOS_SPINLOCK_INIT; static vfs_handle_record_t g_handles[XAIOS_VFS_MAX_HANDLES]; static uint64_t g_next_generation; @@ -204,9 +206,7 @@ xaios_status_t vfs_init(void) { return XAIOS_OK; } -xaios_status_t vfs_mount(const char *mount_path, - const xaios_vfs_backend_ops_t *ops, void *context, - uint32_t flags) { +static xaios_status_t vfs_mount_locked(const char *mount_path, const xaios_vfs_backend_ops_t *ops, void *context, uint32_t flags) { if (ops == 0 || ops->open == 0 || ops->close == 0 || ops->pread == 0 || ops->stat == 0 || flags & ~XAIOS_VFS_MOUNT_READ_ONLY) { return XAIOS_ERR_INVALID; @@ -238,7 +238,7 @@ xaios_status_t vfs_mount(const char *mount_path, return XAIOS_OK; } -xaios_status_t vfs_unmount(const char *mount_path) { +static xaios_status_t vfs_unmount_locked(const char *mount_path) { char normalized[XAIOS_VFS_PATH_MAX]; if (normalize_path(mount_path, normalized) != XAIOS_OK) { return XAIOS_ERR_INVALID; @@ -263,7 +263,7 @@ xaios_status_t vfs_resolve(const char *path, return resolve_normalized(normalized, resolution); } -int64_t vfs_open(const char *path, uint32_t flags, uint32_t owner_id) { +static int64_t vfs_open_locked(const char *path, uint32_t flags, uint32_t owner_id) { if (flags == 0U || flags & ~(XAIOS_VFS_OPEN_READ | XAIOS_VFS_OPEN_WRITE | XAIOS_VFS_OPEN_CREATE | XAIOS_VFS_OPEN_TRUNCATE) || @@ -304,7 +304,7 @@ int64_t vfs_open(const char *path, uint32_t flags, uint32_t owner_id) { return (int64_t)(index + 1U); } -xaios_status_t vfs_close(uint32_t fd, uint32_t owner_id) { +static xaios_status_t vfs_close_locked(uint32_t fd, uint32_t owner_id) { vfs_handle_record_t *handle = find_handle(fd, owner_id); if (handle == 0) return XAIOS_ERR_INVALID; vfs_mount_record_t *mount = &g_mounts[handle->mount_index]; @@ -317,7 +317,7 @@ xaios_status_t vfs_close(uint32_t fd, uint32_t owner_id) { return XAIOS_OK; } -xaios_status_t vfs_release_owner(uint32_t owner_id) { +static xaios_status_t vfs_release_owner_locked(uint32_t owner_id) { if (owner_id == 0U) return XAIOS_ERR_INVALID; xaios_status_t result = XAIOS_OK; for (uint32_t index = 0U; index < XAIOS_VFS_MAX_HANDLES; ++index) { @@ -348,8 +348,7 @@ xaios_status_t vfs_release_owner(uint32_t owner_id) { return result; } -int64_t vfs_pread(uint32_t fd, uint32_t owner_id, void *buffer, - uint64_t length, uint64_t offset) { +static int64_t vfs_pread_locked(uint32_t fd, uint32_t owner_id, void *buffer, uint64_t length, uint64_t offset) { vfs_handle_record_t *handle = find_handle(fd, owner_id); if (handle == 0 || buffer == 0 || (handle->flags & XAIOS_VFS_OPEN_READ) == 0U) { @@ -360,8 +359,7 @@ int64_t vfs_pread(uint32_t fd, uint32_t owner_id, void *buffer, length, offset); } -int64_t vfs_pwrite(uint32_t fd, uint32_t owner_id, const void *buffer, - uint64_t length, uint64_t offset) { +static int64_t vfs_pwrite_locked(uint32_t fd, uint32_t owner_id, const void *buffer, uint64_t length, uint64_t offset) { vfs_handle_record_t *handle = find_handle(fd, owner_id); if (handle == 0 || buffer == 0 || (handle->flags & XAIOS_VFS_OPEN_WRITE) == 0U) { @@ -376,11 +374,11 @@ int64_t vfs_pwrite(uint32_t fd, uint32_t owner_id, const void *buffer, length, offset); } -int64_t vfs_read(uint32_t fd, uint32_t owner_id, void *buffer, - uint64_t length) { +static int64_t vfs_read_locked(uint32_t fd, uint32_t owner_id, void *buffer, uint64_t length) { vfs_handle_record_t *handle = find_handle(fd, owner_id); if (handle == 0) return XAIOS_ERR_INVALID; - int64_t result = vfs_pread(fd, owner_id, buffer, length, handle->cursor); + int64_t result = vfs_pread_locked(fd, owner_id, buffer, length, + handle->cursor); if (result > 0) { if ((uint64_t)result > UINT64_MAX - handle->cursor) return XAIOS_ERR_INVALID; handle->cursor += (uint64_t)result; @@ -388,11 +386,11 @@ int64_t vfs_read(uint32_t fd, uint32_t owner_id, void *buffer, return result; } -int64_t vfs_write(uint32_t fd, uint32_t owner_id, const void *buffer, - uint64_t length) { +static int64_t vfs_write_locked(uint32_t fd, uint32_t owner_id, const void *buffer, uint64_t length) { vfs_handle_record_t *handle = find_handle(fd, owner_id); if (handle == 0) return XAIOS_ERR_INVALID; - int64_t result = vfs_pwrite(fd, owner_id, buffer, length, handle->cursor); + int64_t result = vfs_pwrite_locked(fd, owner_id, buffer, length, + handle->cursor); if (result > 0) { if ((uint64_t)result > UINT64_MAX - handle->cursor) return XAIOS_ERR_INVALID; handle->cursor += (uint64_t)result; @@ -400,14 +398,14 @@ int64_t vfs_write(uint32_t fd, uint32_t owner_id, const void *buffer, return result; } -xaios_status_t vfs_seek(uint32_t fd, uint32_t owner_id, uint64_t offset) { +static xaios_status_t vfs_seek_locked(uint32_t fd, uint32_t owner_id, uint64_t offset) { vfs_handle_record_t *handle = find_handle(fd, owner_id); if (handle == 0) return XAIOS_ERR_INVALID; handle->cursor = offset; return XAIOS_OK; } -xaios_status_t vfs_fsync(uint32_t fd, uint32_t owner_id) { +static xaios_status_t vfs_fsync_locked(uint32_t fd, uint32_t owner_id) { vfs_handle_record_t *handle = find_handle(fd, owner_id); if (handle == 0) return XAIOS_ERR_INVALID; vfs_mount_record_t *mount = &g_mounts[handle->mount_index]; @@ -416,7 +414,7 @@ xaios_status_t vfs_fsync(uint32_t fd, uint32_t owner_id) { : XAIOS_ERR_UNSUPPORTED; } -xaios_status_t vfs_truncate(uint32_t fd, uint32_t owner_id, uint64_t size) { +static xaios_status_t vfs_truncate_locked(uint32_t fd, uint32_t owner_id, uint64_t size) { vfs_handle_record_t *handle = find_handle(fd, owner_id); if (handle == 0 || (handle->flags & XAIOS_VFS_OPEN_WRITE) == 0U) { return XAIOS_ERR_INVALID; @@ -429,8 +427,7 @@ xaios_status_t vfs_truncate(uint32_t fd, uint32_t owner_id, uint64_t size) { return mount->ops->truncate(mount->context, handle->backend_handle, size); } -xaios_status_t vfs_fallocate(uint32_t fd, uint32_t owner_id, uint64_t offset, - uint64_t length) { +static xaios_status_t vfs_fallocate_locked(uint32_t fd, uint32_t owner_id, uint64_t offset, uint64_t length) { vfs_handle_record_t *handle = find_handle(fd, owner_id); if (handle == 0 || length == 0U || offset > UINT64_MAX - length || (handle->flags & XAIOS_VFS_OPEN_WRITE) == 0U) { @@ -454,7 +451,7 @@ static xaios_status_t resolve_operation(const char *path, return XAIOS_OK; } -xaios_status_t vfs_stat(const char *path, xaios_vfs_stat_t *stat) { +static xaios_status_t vfs_stat_locked(const char *path, xaios_vfs_stat_t *stat) { if (stat == 0) return XAIOS_ERR_INVALID; xaios_vfs_resolution_t resolution; vfs_mount_record_t *mount = 0; @@ -464,7 +461,7 @@ xaios_status_t vfs_stat(const char *path, xaios_vfs_stat_t *stat) { : status; } -xaios_status_t vfs_statfs(const char *path, xaios_vfs_statfs_t *statfs) { +static xaios_status_t vfs_statfs_locked(const char *path, xaios_vfs_statfs_t *statfs) { if (statfs == 0) return XAIOS_ERR_INVALID; xaios_vfs_resolution_t resolution; vfs_mount_record_t *mount = 0; @@ -494,36 +491,36 @@ static xaios_status_t path_mutation( return operation(mount->context, resolution.relative_path); } -xaios_status_t vfs_mkdir(const char *path) { +static xaios_status_t vfs_mkdir_locked(const char *path) { xaios_vfs_resolution_t resolution; vfs_mount_record_t *mount = 0; xaios_status_t status = resolve_operation(path, &resolution, &mount); return status == XAIOS_OK ? path_mutation(path, mount->ops->mkdir) : status; } -xaios_status_t vfs_rmdir(const char *path) { +static xaios_status_t vfs_rmdir_locked(const char *path) { xaios_vfs_resolution_t resolution; vfs_mount_record_t *mount = 0; xaios_status_t status = resolve_operation(path, &resolution, &mount); return status == XAIOS_OK ? path_mutation(path, mount->ops->rmdir) : status; } -xaios_status_t vfs_unlink(const char *path) { +static xaios_status_t vfs_unlink_locked(const char *path) { xaios_vfs_resolution_t resolution; vfs_mount_record_t *mount = 0; xaios_status_t status = resolve_operation(path, &resolution, &mount); return status == XAIOS_OK ? path_mutation(path, mount->ops->unlink) : status; } -xaios_status_t vfs_delete(const char *path) { +static xaios_status_t vfs_delete_locked(const char *path) { xaios_vfs_stat_t stat; - xaios_status_t status = vfs_stat(path, &stat); + xaios_status_t status = vfs_stat_locked(path, &stat); if (status != XAIOS_OK) return status; - return stat.type == XAIOS_VFS_TYPE_DIRECTORY ? vfs_rmdir(path) - : vfs_unlink(path); + return stat.type == XAIOS_VFS_TYPE_DIRECTORY ? vfs_rmdir_locked(path) + : vfs_unlink_locked(path); } -xaios_status_t vfs_rename(const char *old_path, const char *new_path) { +static xaios_status_t vfs_rename_locked(const char *old_path, const char *new_path) { xaios_vfs_resolution_t old_resolution; xaios_vfs_resolution_t new_resolution; if (vfs_resolve(old_path, &old_resolution) != XAIOS_OK || @@ -542,8 +539,7 @@ xaios_status_t vfs_rename(const char *old_path, const char *new_path) { new_resolution.relative_path); } -xaios_status_t vfs_list(const char *path, char *buffer, uint64_t capacity, - uint64_t *out_size) { +static xaios_status_t vfs_list_locked(const char *path, char *buffer, uint64_t capacity, uint64_t *out_size) { if (buffer == 0 || capacity == 0U || out_size == 0) { return XAIOS_ERR_INVALID; } @@ -556,3 +552,159 @@ xaios_status_t vfs_list(const char *path, char *buffer, uint64_t capacity, return mount->ops->list(mount->context, resolution.relative_path, buffer, capacity, out_size); } + + +/* Serialised public entry points. + The handle table and mount table are reached from every CPU through the + filesystem syscalls, and were mutated with no mutual exclusion: vfs_open + scanned for a free slot and filled it in separate steps while vfs_close and + vfs_release_owner cleared entries underneath it. Each entry point now runs + under one lock; the bodies above assume it is held and must not be called + directly. */ +xaios_status_t vfs_mount(const char *mount_path, const xaios_vfs_backend_ops_t *ops, void *context, uint32_t flags) { + xaios_spin_lock(&g_vfs_lock); + xaios_status_t result = vfs_mount_locked(mount_path, ops, context, flags); + xaios_spin_unlock(&g_vfs_lock); + return result; +} + +xaios_status_t vfs_unmount(const char *mount_path) { + xaios_spin_lock(&g_vfs_lock); + xaios_status_t result = vfs_unmount_locked(mount_path); + xaios_spin_unlock(&g_vfs_lock); + return result; +} + +int64_t vfs_open(const char *path, uint32_t flags, uint32_t owner_id) { + xaios_spin_lock(&g_vfs_lock); + int64_t result = vfs_open_locked(path, flags, owner_id); + xaios_spin_unlock(&g_vfs_lock); + return result; +} + +xaios_status_t vfs_close(uint32_t fd, uint32_t owner_id) { + xaios_spin_lock(&g_vfs_lock); + xaios_status_t result = vfs_close_locked(fd, owner_id); + xaios_spin_unlock(&g_vfs_lock); + return result; +} + +xaios_status_t vfs_release_owner(uint32_t owner_id) { + xaios_spin_lock(&g_vfs_lock); + xaios_status_t result = vfs_release_owner_locked(owner_id); + xaios_spin_unlock(&g_vfs_lock); + return result; +} + +int64_t vfs_pread(uint32_t fd, uint32_t owner_id, void *buffer, uint64_t length, uint64_t offset) { + xaios_spin_lock(&g_vfs_lock); + int64_t result = vfs_pread_locked(fd, owner_id, buffer, length, offset); + xaios_spin_unlock(&g_vfs_lock); + return result; +} + +int64_t vfs_pwrite(uint32_t fd, uint32_t owner_id, const void *buffer, uint64_t length, uint64_t offset) { + xaios_spin_lock(&g_vfs_lock); + int64_t result = vfs_pwrite_locked(fd, owner_id, buffer, length, offset); + xaios_spin_unlock(&g_vfs_lock); + return result; +} + +int64_t vfs_read(uint32_t fd, uint32_t owner_id, void *buffer, uint64_t length) { + xaios_spin_lock(&g_vfs_lock); + int64_t result = vfs_read_locked(fd, owner_id, buffer, length); + xaios_spin_unlock(&g_vfs_lock); + return result; +} + +int64_t vfs_write(uint32_t fd, uint32_t owner_id, const void *buffer, uint64_t length) { + xaios_spin_lock(&g_vfs_lock); + int64_t result = vfs_write_locked(fd, owner_id, buffer, length); + xaios_spin_unlock(&g_vfs_lock); + return result; +} + +xaios_status_t vfs_seek(uint32_t fd, uint32_t owner_id, uint64_t offset) { + xaios_spin_lock(&g_vfs_lock); + xaios_status_t result = vfs_seek_locked(fd, owner_id, offset); + xaios_spin_unlock(&g_vfs_lock); + return result; +} + +xaios_status_t vfs_fsync(uint32_t fd, uint32_t owner_id) { + xaios_spin_lock(&g_vfs_lock); + xaios_status_t result = vfs_fsync_locked(fd, owner_id); + xaios_spin_unlock(&g_vfs_lock); + return result; +} + +xaios_status_t vfs_truncate(uint32_t fd, uint32_t owner_id, uint64_t size) { + xaios_spin_lock(&g_vfs_lock); + xaios_status_t result = vfs_truncate_locked(fd, owner_id, size); + xaios_spin_unlock(&g_vfs_lock); + return result; +} + +xaios_status_t vfs_fallocate(uint32_t fd, uint32_t owner_id, uint64_t offset, uint64_t length) { + xaios_spin_lock(&g_vfs_lock); + xaios_status_t result = vfs_fallocate_locked(fd, owner_id, offset, length); + xaios_spin_unlock(&g_vfs_lock); + return result; +} + +xaios_status_t vfs_stat(const char *path, xaios_vfs_stat_t *stat) { + xaios_spin_lock(&g_vfs_lock); + xaios_status_t result = vfs_stat_locked(path, stat); + xaios_spin_unlock(&g_vfs_lock); + return result; +} + +xaios_status_t vfs_statfs(const char *path, xaios_vfs_statfs_t *statfs) { + xaios_spin_lock(&g_vfs_lock); + xaios_status_t result = vfs_statfs_locked(path, statfs); + xaios_spin_unlock(&g_vfs_lock); + return result; +} + +xaios_status_t vfs_mkdir(const char *path) { + xaios_spin_lock(&g_vfs_lock); + xaios_status_t result = vfs_mkdir_locked(path); + xaios_spin_unlock(&g_vfs_lock); + return result; +} + +xaios_status_t vfs_rmdir(const char *path) { + xaios_spin_lock(&g_vfs_lock); + xaios_status_t result = vfs_rmdir_locked(path); + xaios_spin_unlock(&g_vfs_lock); + return result; +} + +xaios_status_t vfs_unlink(const char *path) { + xaios_spin_lock(&g_vfs_lock); + xaios_status_t result = vfs_unlink_locked(path); + xaios_spin_unlock(&g_vfs_lock); + return result; +} + +xaios_status_t vfs_delete(const char *path) { + xaios_spin_lock(&g_vfs_lock); + xaios_status_t result = vfs_delete_locked(path); + xaios_spin_unlock(&g_vfs_lock); + return result; +} + +xaios_status_t vfs_rename(const char *old_path, const char *new_path) { + xaios_spin_lock(&g_vfs_lock); + xaios_status_t result = vfs_rename_locked(old_path, new_path); + xaios_spin_unlock(&g_vfs_lock); + return result; +} + +xaios_status_t vfs_list(const char *path, char *buffer, uint64_t capacity, uint64_t *out_size) { + xaios_spin_lock(&g_vfs_lock); + xaios_status_t result = vfs_list_locked(path, buffer, capacity, out_size); + xaios_spin_unlock(&g_vfs_lock); + return result; +} + diff --git a/tests/scripts/run-parser-fuzz.py b/tests/scripts/run-parser-fuzz.py index 74bfb940..d16f10d9 100644 --- a/tests/scripts/run-parser-fuzz.py +++ b/tests/scripts/run-parser-fuzz.py @@ -25,6 +25,13 @@ def main() -> int: "clang", "-std=c99", "-O1", "-g", "-fno-omit-frame-pointer", "-fsanitize=fuzzer,address,undefined", "-Wall", "-Wextra", "-Werror", "-Wno-unused-function", + # BearSSL calls getentropy(), which glibc hides under -std=c99 unless + # _DEFAULT_SOURCE is defined. macOS declares it either way, so without + # this the DNS target only builds on a development host. + "-D_DEFAULT_SOURCE", + # openbsd-compat uses __nonstring__, unknown to clang before 21, the + # same reason scripts/build-image.sh passes this for those files. + "-Wno-unknown-attributes", ] targets = { "ssh-packet": [ From 4e9bd7639dc83eb417d82be0dd72d18507a1bfac Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Andr=C3=A9=20Borchert?= Date: Sun, 23 Aug 2026 20:36:19 +0700 Subject: [PATCH 08/16] Give the hosted VFS test the symbol the lock needs Serialising vfs.c made the hosted test-vfs binary fail to link: the kernel ticket lock's single-CPU fast path calls smp_online_count, and that test links only the filesystem translation unit. Provide the one symbol it needs, which reports a single CPU because the hosted test is single threaded. Verified: test-vfs links and passes, and make hosted-test runs to completion. Co-Authored-By: Claude Opus 5 --- tests/storage/test_vfs.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/tests/storage/test_vfs.c b/tests/storage/test_vfs.c index 88b04a6c..b90f7fd0 100644 --- a/tests/storage/test_vfs.c +++ b/tests/storage/test_vfs.c @@ -162,6 +162,11 @@ static const xaios_vfs_backend_ops_t k_mock_ops = { mock_path_ok, mock_path_ok, mock_rename, mock_list, }; +/* vfs.c serialises its handle table with the kernel ticket lock, whose + single-CPU fast path asks how many CPUs are online. The hosted test links + only the filesystem translation unit, so provide the one symbol it needs. */ +uint32_t smp_online_count(void) { return 1U; } + int main(void) { mock_fs_t root; mock_fs_t models; From 9f6f73aa2316a878ae717520855dc52dd22dd417 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Andr=C3=A9=20Borchert?= Date: Sun, 23 Aug 2026 21:32:52 +0700 Subject: [PATCH 09/16] Validate the updater chain instead of pinning its leaf key The updater moved to https://xaios.91.99.176.243.nip.io, served through the master Caddy edge with a publicly issued certificate. xapt pinned the exact leaf RSA key, which cannot work against a certificate that is reissued with a fresh key every renewal, and the edge now presents ECDSA, which the single offered cipher suite could not verify at all. xapt now validates the presented chain against compiled-in ISRG roots, checking the server name and validity window, and offers the ECDSA suite alongside the RSA one. The roots are generated from a trusted local CA store, never from the server being validated. Pinning is kept for a private origin reached by address, where no public chain exists, so the existing gate is unchanged and still passes on both architectures. An unset realtime clock is refused outright rather than validated against 1970, so the failure names itself instead of surfacing as a confusing expiry error. Also repair two hazards in the publisher, which predate this change but became dangerous once a shared edge existed: it reloaded the `caddy` service, now the master fronting unrelated projects, and its --delete-delay rsync would have removed the updater's own binary and config, which live inside the directory it serves. Co-Authored-By: Claude Opus 5 --- deploy/xapt/Caddyfile | 55 ++++++++++++- scripts/build-image.sh | 12 ++- scripts/gen-xapt-trust-anchors.py | 109 ++++++++++++++++++++++++++ scripts/publish-xapt-repository.sh | 54 +++++-------- userspace/apps/trust/ISRG_Root_X1.pem | 31 ++++++++ userspace/apps/trust/ISRG_Root_X2.pem | 14 ++++ userspace/apps/xapt.c | 2 +- userspace/apps/xapt_tls.c | 79 ++++++++++++++++--- userspace/apps/xapt_tls.h | 4 + userspace/apps/xapt_trust_anchors.c | 99 +++++++++++++++++++++++ userspace/apps/xapt_trust_anchors.h | 11 +++ userspace/init/xapt.conf | 5 +- wiki/Current-Limitations.md | 5 +- wiki/Xapt-Package-Updates.md | 42 ++++++---- 14 files changed, 453 insertions(+), 69 deletions(-) create mode 100644 scripts/gen-xapt-trust-anchors.py create mode 100644 userspace/apps/trust/ISRG_Root_X1.pem create mode 100644 userspace/apps/trust/ISRG_Root_X2.pem create mode 100644 userspace/apps/xapt_trust_anchors.c create mode 100644 userspace/apps/xapt_trust_anchors.h diff --git a/deploy/xapt/Caddyfile b/deploy/xapt/Caddyfile index 0c11d59a..15227f77 100644 --- a/deploy/xapt/Caddyfile +++ b/deploy/xapt/Caddyfile @@ -1,9 +1,58 @@ -:8443 { - tls /etc/caddy/xapt-tls-cert.pem /etc/caddy/xapt-tls-key.pem +# The updater's own web server: its own binary, config, storage, user and unit. +# Nothing here is shared with any other project on the host. +# +# Deployed to /var/xaios_updater/caddy/Caddyfile and run by xaios-caddy.service. +# TLS is NOT terminated here — the master edge in /var/caddy owns :443 for +# xaios.91.99.176.243.nip.io and forwards to :8090 below. Reloading the shared +# `caddy` service from this project would take the other projects down with it, +# so publishing only ever reloads xaios-caddy. +{ + # The master terminates TLS and forwards here, so this instance never + # speaks TLS and never talks to an ACME server. + auto_https off + # Its own admin socket: two Caddy processes cannot share the default + # admin endpoint, and the second one to start would fail. + admin unix//var/xaios_updater/caddy/admin.sock + + servers { + # Behind the master, so the forwarded client address is trustworthy + # here. Without this every request logs as 127.0.0.1. + trusted_proxies static private_ranges + } +} + +:8090 { + # Not bound to loopback yet, deliberately. Devices provisioned before the + # master existed still fetch from http://91.99.176.243:8090/, and a + # device's base URL is configured on the device, so binding loopback would + # silently strand them. Integrity does not depend on the transport: + # catalog entries carry sha256, a signature and a key, so a tampered + # artifact is rejected by the device however it arrived. root * /var/xaios_updater + header { + -Server X-Content-Type-Options nosniff + Referrer-Policy "no-referrer" + X-Frame-Options "DENY" + # Applies to the hostname served through the master. HSTS is ignored + # for bare-IP requests, so this cannot strand a device still using + # http://91.99.176.243:8090/. + Strict-Transport-Security "max-age=31536000" Cache-Control "public, max-age=300" } - file_server + + file_server { + # The server's own files live inside the directory it serves, so they + # are hidden explicitly rather than being downloadable. + hide /var/xaios_updater/caddy /var/xaios_updater/bin + } + + log { + output file /var/xaios_updater/caddy/logs/updater.log { + roll_size 20MiB + roll_keep 10 + } + format json + } } diff --git a/scripts/build-image.sh b/scripts/build-image.sh index fe79c30c..fb8a3e6a 100755 --- a/scripts/build-image.sh +++ b/scripts/build-image.sh @@ -813,9 +813,19 @@ for app in $USER_APPS; do -I"$ROOT_DIR/userspace/include" -I"$ROOT_DIR/userspace/apps" \ -I"$ROOT_DIR/third_party/bearssl/inc" \ -c "$ROOT_DIR/userspace/apps/xapt_tls.c" -o "$XAPT_TLS_OBJ" + XAPT_TRUST_OBJ="$INIT_BUILD_DIR/xapt-trust-anchors.o" + "$CLANG" --target="$TARGET_TRIPLE" $USER_ARCH_CFLAGS -std=c99 \ + -ffreestanding -fno-stack-protector -fno-builtin -fno-pic -fno-pie \ + -Os -Wall -Wextra -Werror \ + -isystem "$BUILD_DIR/libc/$TARGET_ARCH/sysroot/include" \ + -I"$ROOT_DIR/userspace/include" -I"$ROOT_DIR/userspace/apps" \ + -I"$ROOT_DIR/third_party/bearssl/inc" \ + -c "$ROOT_DIR/userspace/apps/xapt_trust_anchors.c" \ + -o "$XAPT_TRUST_OBJ" "$LD_LLD" -nostdlib -T "$ROOT_DIR/userspace/init/linker.ld" \ -o "$app_elf" "$USER_START_OBJ" "$USER_LIB_OBJ" \ - "$USER_CONTROL_OBJ" "$app_obj" "$XAPT_TLS_OBJ" "$XAPT_BEARSSL" + "$USER_CONTROL_OBJ" "$app_obj" "$XAPT_TLS_OBJ" "$XAPT_TRUST_OBJ" \ + "$XAPT_BEARSSL" elif [ "$app" = "xaiosctl" ] || [ "$app" = "htop" ]; then "$LD_LLD" \ diff --git a/scripts/gen-xapt-trust-anchors.py b/scripts/gen-xapt-trust-anchors.py new file mode 100644 index 00000000..662acfd2 --- /dev/null +++ b/scripts/gen-xapt-trust-anchors.py @@ -0,0 +1,109 @@ +#!/usr/bin/env python3 +"""Generate the BearSSL trust anchors xapt validates the updater chain against. + +xapt used to pin the updater's exact leaf RSA key. A publicly issued +certificate is renewed every few months with a fresh key, so a leaf pin has to +be re-cut on every renewal or the updater stops working. Anchoring on the +issuing roots instead survives renewal, and the update payload keeps its own +signature, so TLS here only has to establish a trustworthy transport. + +The roots come from a trusted local CA store, never from the server being +validated. Regenerate after replacing a PEM in userspace/apps/trust: + + python3 scripts/gen-xapt-trust-anchors.py +""" + +import pathlib +import sys + +from cryptography import x509 +from cryptography.hazmat.primitives.asymmetric import ec, rsa +from cryptography.hazmat.primitives.serialization import ( + Encoding, + PublicFormat, +) + +ROOT = pathlib.Path(__file__).resolve().parent.parent +TRUST_DIR = ROOT / "userspace/apps/trust" +OUTPUT = ROOT / "userspace/apps/xapt_trust_anchors.c" + +# BearSSL curve identifiers (br_ec_*), from inc/bearssl_ec.h. +CURVE_IDS = {"secp256r1": 23, "secp384r1": 24, "secp521r1": 25} + + +def emit_bytes(name, data): + lines = [f"static const unsigned char {name}[] = {{"] + for offset in range(0, len(data), 12): + chunk = data[offset : offset + 12] + lines.append(" " + " ".join(f"0x{b:02X}," for b in chunk)) + lines.append("};") + return "\n".join(lines) + + +def integer_bytes(value): + return value.to_bytes((value.bit_length() + 7) // 8, "big") + + +def main(): + pems = sorted(TRUST_DIR.glob("*.pem")) + if not pems: + sys.exit(f"no root certificates found in {TRUST_DIR}") + + blocks = [] + entries = [] + for index, pem in enumerate(pems): + cert = x509.load_pem_x509_certificate(pem.read_bytes()) + public_key = cert.public_key() + dn = cert.subject.public_bytes() + blocks.append(f"/* {cert.subject.rfc4514_string()} ({pem.name}) */") + blocks.append(emit_bytes(f"TA{index}_DN", dn)) + + if isinstance(public_key, rsa.RSAPublicKey): + numbers = public_key.public_numbers() + blocks.append(emit_bytes(f"TA{index}_N", integer_bytes(numbers.n))) + blocks.append(emit_bytes(f"TA{index}_E", integer_bytes(numbers.e))) + key = ( + f"BR_KEYTYPE_RSA,\n" + f" {{ .rsa = {{ (unsigned char *)TA{index}_N, sizeof TA{index}_N,\n" + f" (unsigned char *)TA{index}_E, sizeof TA{index}_E }} }}" + ) + elif isinstance(public_key, ec.EllipticCurvePublicKey): + curve = public_key.curve.name + if curve not in CURVE_IDS: + sys.exit(f"{pem.name}: unsupported curve {curve}") + point = public_key.public_bytes( + Encoding.X962, PublicFormat.UncompressedPoint + ) + blocks.append(emit_bytes(f"TA{index}_Q", point)) + key = ( + f"BR_KEYTYPE_EC,\n" + f" {{ .ec = {{ {CURVE_IDS[curve]}, (unsigned char *)TA{index}_Q,\n" + f" sizeof TA{index}_Q }} }}" + ) + else: + sys.exit(f"{pem.name}: unsupported key type {type(public_key).__name__}") + + entries.append( + f" {{ {{ (unsigned char *)TA{index}_DN, sizeof TA{index}_DN }},\n" + f" BR_X509_TA_CA,\n" + f" {{ {key} }} }}," + ) + blocks.append("") + + body = "\n".join(blocks) + table = "\n".join(entries) + OUTPUT.write_text( + "/* Generated by scripts/gen-xapt-trust-anchors.py. Do not edit. */\n" + '#include "xapt_trust_anchors.h"\n\n' + f"{body}\n" + "const br_x509_trust_anchor XAPT_TRUST_ANCHORS[] = {\n" + f"{table}\n" + "};\n\n" + "const size_t XAPT_TRUST_ANCHORS_COUNT =\n" + " sizeof XAPT_TRUST_ANCHORS / sizeof XAPT_TRUST_ANCHORS[0];\n" + ) + print(f"wrote {OUTPUT.relative_to(ROOT)} with {len(pems)} anchors") + + +if __name__ == "__main__": + main() diff --git a/scripts/publish-xapt-repository.sh b/scripts/publish-xapt-repository.sh index 751267ff..53aa4fcd 100755 --- a/scripts/publish-xapt-repository.sh +++ b/scripts/publish-xapt-repository.sh @@ -1,49 +1,35 @@ #!/bin/sh set -eu +# Publish a verified xapt repository to the updater host. +# +# TLS is terminated by the master edge in /var/caddy, which also fronts the +# other projects on this host. This script therefore never writes /etc/caddy +# and never reloads the shared `caddy` service — doing so would take those +# projects down. It syncs the repository and reloads the updater's own +# instance, xaios-caddy, which serves plain HTTP on :8090 behind the master. + ROOT=$(CDPATH= cd -- "$(dirname "$0")/.." && pwd) SOURCE=${1:-"$ROOT/build/xapt/repository"} HOST=${XAIOS_UPDATE_HOST:-root@91.99.176.243} DESTINATION=${XAIOS_UPDATE_ROOT:-/var/xaios_updater} -TLS_CERT=${XAIOS_XAPT_TLS_CERT:-} -TLS_KEY=${XAIOS_XAPT_TLS_KEY:-} - -if [ -z "$TLS_CERT" ] || [ -z "$TLS_KEY" ]; then - if [ "${XAIOS_ALLOW_TEST_TLS_FIXTURE:-0}" = 1 ]; then - TLS_CERT="$ROOT/tests/fixtures/xapt-tls-cert.pem" - TLS_KEY="$ROOT/tests/fixtures/xapt-tls-key.pem" - printf '%s\n' \ - 'warning: publishing the public test-only TLS identity; never use this endpoint in production' >&2 - else - printf '%s\n' \ - 'error: set XAIOS_XAPT_TLS_CERT and XAIOS_XAPT_TLS_KEY to an operator-managed TLS identity' >&2 - exit 2 - fi -fi -[ -r "$TLS_CERT" ] || { printf 'error: unreadable TLS certificate: %s\n' "$TLS_CERT" >&2; exit 2; } -[ -r "$TLS_KEY" ] || { printf 'error: unreadable TLS key: %s\n' "$TLS_KEY" >&2; exit 2; } +SERVICE=${XAIOS_UPDATE_SERVICE:-xaios-caddy} [ -d "$SOURCE" ] || { printf 'error: repository directory not found: %s\n' "$SOURCE" >&2 exit 1 } python3 "$ROOT/tools/xaios_xapt_repo.py" verify --repository "$SOURCE" + ssh "$HOST" "install -d -m 0755 '$DESTINATION'" -rsync -rlpt --delete-delay "$SOURCE/" "$HOST:$DESTINATION/" -scp "$ROOT/deploy/xapt/Caddyfile" "$HOST:/etc/caddy/Caddyfile.xapt-new" -scp "$TLS_CERT" \ - "$HOST:/etc/caddy/xapt-tls-cert.pem.new" -scp "$TLS_KEY" \ - "$HOST:/etc/caddy/xapt-tls-key.pem.new" -ssh "$HOST" "caddy validate --config /etc/caddy/Caddyfile.xapt-new && \ - install -m 0644 /etc/caddy/xapt-tls-cert.pem.new /etc/caddy/xapt-tls-cert.pem && \ - install -m 0600 /etc/caddy/xapt-tls-key.pem.new /etc/caddy/xapt-tls-key.pem && \ - install -m 0644 /etc/caddy/Caddyfile.xapt-new /etc/caddy/Caddyfile && \ - rm -f /etc/caddy/Caddyfile.xapt-new /etc/caddy/xapt-tls-cert.pem.new \ - /etc/caddy/xapt-tls-key.pem.new && \ - if systemctl is-active --quiet caddy; then \ - systemctl reload caddy; \ - else \ - systemctl enable --now caddy; \ - fi" +# The updater's own server lives inside the directory it serves; excluding it +# keeps --delete-delay from removing the binary and config out from under it. +rsync -rlpt --delete-delay \ + --exclude /caddy/ --exclude /bin/ \ + "$SOURCE/" "$HOST:$DESTINATION/" + +ssh "$HOST" "systemctl reload-or-restart '$SERVICE' && \ + systemctl is-active --quiet '$SERVICE'" + printf 'Published verified xapt repository to %s:%s\n' "$HOST" "$DESTINATION" +printf 'Reachable at https://xaios.91.99.176.243.nip.io/ via the master edge.\n' diff --git a/userspace/apps/trust/ISRG_Root_X1.pem b/userspace/apps/trust/ISRG_Root_X1.pem new file mode 100644 index 00000000..b85c8037 --- /dev/null +++ b/userspace/apps/trust/ISRG_Root_X1.pem @@ -0,0 +1,31 @@ +-----BEGIN CERTIFICATE----- +MIIFazCCA1OgAwIBAgIRAIIQz7DSQONZRGPgu2OCiwAwDQYJKoZIhvcNAQELBQAw +TzELMAkGA1UEBhMCVVMxKTAnBgNVBAoTIEludGVybmV0IFNlY3VyaXR5IFJlc2Vh +cmNoIEdyb3VwMRUwEwYDVQQDEwxJU1JHIFJvb3QgWDEwHhcNMTUwNjA0MTEwNDM4 +WhcNMzUwNjA0MTEwNDM4WjBPMQswCQYDVQQGEwJVUzEpMCcGA1UEChMgSW50ZXJu +ZXQgU2VjdXJpdHkgUmVzZWFyY2ggR3JvdXAxFTATBgNVBAMTDElTUkcgUm9vdCBY +MTCCAiIwDQYJKoZIhvcNAQEBBQADggIPADCCAgoCggIBAK3oJHP0FDfzm54rVygc +h77ct984kIxuPOZXoHj3dcKi/vVqbvYATyjb3miGbESTtrFj/RQSa78f0uoxmyF+ +0TM8ukj13Xnfs7j/EvEhmkvBioZxaUpmZmyPfjxwv60pIgbz5MDmgK7iS4+3mX6U +A5/TR5d8mUgjU+g4rk8Kb4Mu0UlXjIB0ttov0DiNewNwIRt18jA8+o+u3dpjq+sW +T8KOEUt+zwvo/7V3LvSye0rgTBIlDHCNAymg4VMk7BPZ7hm/ELNKjD+Jo2FR3qyH +B5T0Y3HsLuJvW5iB4YlcNHlsdu87kGJ55tukmi8mxdAQ4Q7e2RCOFvu396j3x+UC +B5iPNgiV5+I3lg02dZ77DnKxHZu8A/lJBdiB3QW0KtZB6awBdpUKD9jf1b0SHzUv +KBds0pjBqAlkd25HN7rOrFleaJ1/ctaJxQZBKT5ZPt0m9STJEadao0xAH0ahmbWn +OlFuhjuefXKnEgV4We0+UXgVCwOPjdAvBbI+e0ocS3MFEvzG6uBQE3xDk3SzynTn +jh8BCNAw1FtxNrQHusEwMFxIt4I7mKZ9YIqioymCzLq9gwQbooMDQaHWBfEbwrbw +qHyGO0aoSCqI3Haadr8faqU9GY/rOPNk3sgrDQoo//fb4hVC1CLQJ13hef4Y53CI +rU7m2Ys6xt0nUW7/vGT1M0NPAgMBAAGjQjBAMA4GA1UdDwEB/wQEAwIBBjAPBgNV +HRMBAf8EBTADAQH/MB0GA1UdDgQWBBR5tFnme7bl5AFzgAiIyBpY9umbbjANBgkq +hkiG9w0BAQsFAAOCAgEAVR9YqbyyqFDQDLHYGmkgJykIrGF1XIpu+ILlaS/V9lZL +ubhzEFnTIZd+50xx+7LSYK05qAvqFyFWhfFQDlnrzuBZ6brJFe+GnY+EgPbk6ZGQ +3BebYhtF8GaV0nxvwuo77x/Py9auJ/GpsMiu/X1+mvoiBOv/2X/qkSsisRcOj/KK +NFtY2PwByVS5uCbMiogziUwthDyC3+6WVwW6LLv3xLfHTjuCvjHIInNzktHCgKQ5 +ORAzI4JMPJ+GslWYHb4phowim57iaztXOoJwTdwJx4nLCgdNbOhdjsnvzqvHu7Ur +TkXWStAmzOVyyghqpZXjFaH3pO3JLF+l+/+sKAIuvtd7u+Nxe5AW0wdeRlN8NwdC +jNPElpzVmbUq4JUagEiuTDkHzsxHpFKVK7q4+63SM1N95R1NbdWhscdCb+ZAJzVc +oyi3B43njTOQ5yOf+1CceWxG1bQVs5ZufpsMljq4Ui0/1lvh+wjChP4kqKOJ2qxq +4RgqsahDYVvTH9w7jXbyLeiNdd8XM2w9U/t7y0Ff/9yi0GE44Za4rF2LN9d11TPA +mRGunUHBcnWEvgJBQl9nJEiU0Zsnvgc/ubhPgXRR4Xq37Z0j4r7g1SgEEzwxA57d +emyPxgcYxn/eR44/KJ4EBs+lVDR3veyJm+kXQ99b21/+jh5Xos1AnX5iItreGCc= +-----END CERTIFICATE----- diff --git a/userspace/apps/trust/ISRG_Root_X2.pem b/userspace/apps/trust/ISRG_Root_X2.pem new file mode 100644 index 00000000..7d903edc --- /dev/null +++ b/userspace/apps/trust/ISRG_Root_X2.pem @@ -0,0 +1,14 @@ +-----BEGIN CERTIFICATE----- +MIICGzCCAaGgAwIBAgIQQdKd0XLq7qeAwSxs6S+HUjAKBggqhkjOPQQDAzBPMQsw +CQYDVQQGEwJVUzEpMCcGA1UEChMgSW50ZXJuZXQgU2VjdXJpdHkgUmVzZWFyY2gg +R3JvdXAxFTATBgNVBAMTDElTUkcgUm9vdCBYMjAeFw0yMDA5MDQwMDAwMDBaFw00 +MDA5MTcxNjAwMDBaME8xCzAJBgNVBAYTAlVTMSkwJwYDVQQKEyBJbnRlcm5ldCBT +ZWN1cml0eSBSZXNlYXJjaCBHcm91cDEVMBMGA1UEAxMMSVNSRyBSb290IFgyMHYw +EAYHKoZIzj0CAQYFK4EEACIDYgAEzZvVn4CDCuwJSvMWSj5cz3es3mcFDR0HttwW ++1qLFNvicWDEukWVEYmO6gbf9yoWHKS5xcUy4APgHoIYOIvXRdgKam7mAHf7AlF9 +ItgKbppbd9/w+kHsOdx1ymgHDB/qo0IwQDAOBgNVHQ8BAf8EBAMCAQYwDwYDVR0T +AQH/BAUwAwEB/zAdBgNVHQ4EFgQUfEKWrt5LSDv6kviejM9ti6lyN5UwCgYIKoZI +zj0EAwMDaAAwZQIwe3lORlCEwkSHRhtFcP9Ymd70/aTSVaYgLXTWNLxBo1BfASdW +tL4ndQavEi51mI38AjEAi/V3bNTIZargCyzuFJ0nN6T5U6VR5CmD1/iQMVtCnwr1 +/q4AaOeMSQ+2b1tbFfLn +-----END CERTIFICATE----- diff --git a/userspace/apps/xapt.c b/userspace/apps/xapt.c index f652de6f..cd2d5270 100644 --- a/userspace/apps/xapt.c +++ b/userspace/apps/xapt.c @@ -404,7 +404,7 @@ static int load_config(xapt_config_t *config) { } return config->host[0] != '\0' && config->port > 0U && config->port <= 65535U && - (config->tls_required == 0U || + (xaios_strlen(config->tls_rsa_modulus) == 0U || xaios_strlen(config->tls_rsa_modulus) == XAPT_TLS_MODULUS_HEX_BYTES) && (config->base[0] == '\0' || path_valid(config->base)) diff --git a/userspace/apps/xapt_tls.c b/userspace/apps/xapt_tls.c index 447cd538..363f9764 100644 --- a/userspace/apps/xapt_tls.c +++ b/userspace/apps/xapt_tls.c @@ -2,11 +2,23 @@ #include #include "xapt_tls.h" +#include "xapt_trust_anchors.h" #define XAPT_TLS_RSA_BYTES 256U +/* br_x509_minimal_set_time counts days from year 0; the realtime clock counts + from 1970. This is the offset between the two in the Gregorian calendar. */ +#define XAPT_TLS_EPOCH_DAYS UINT32_C(719528) +#define XAPT_TLS_SECONDS_PER_DAY UINT64_C(86400) + +/* An unset clock reads as 1970, which would make every certificate look + not-yet-valid. Refuse instead of reporting a confusing expiry failure; + 2025-01-01 is comfortably before any certificate this client will meet. */ +#define XAPT_TLS_MIN_EPOCH_SECONDS UINT64_C(1735689600) + static br_ssl_client_context g_client; -static br_x509_knownkey_context g_validator; +static br_x509_minimal_context g_minimal; +static br_x509_knownkey_context g_knownkey; static br_sslio_context g_io; static unsigned char g_io_buffer[BR_SSL_BUFSIZE_BIDI]; static unsigned char g_modulus[XAPT_TLS_RSA_BYTES]; @@ -59,14 +71,59 @@ static int socket_write(void *context, const unsigned char *data, return offset == size ? (int)size : -1; } +/* Validate the presented chain against the compiled-in roots, including the + server name and the validity window. Used for publicly issued certificates, + which are reissued with a fresh key long before an image is rebuilt. */ +static int use_chain_validation(void) { + u64 epoch_seconds = + xaios_clock_nanos_kind(XAIOS_CLOCK_REALTIME) / UINT64_C(1000000000); + if (epoch_seconds < XAPT_TLS_MIN_EPOCH_SECONDS) { + g_error = 83; + return -1; + } + br_x509_minimal_init(&g_minimal, &br_sha256_vtable, XAPT_TRUST_ANCHORS, + XAPT_TRUST_ANCHORS_COUNT); + br_x509_minimal_set_hash(&g_minimal, br_sha256_ID, &br_sha256_vtable); + br_x509_minimal_set_hash(&g_minimal, br_sha384_ID, &br_sha384_vtable); + br_x509_minimal_set_hash(&g_minimal, br_sha512_ID, &br_sha512_vtable); + br_x509_minimal_set_rsa(&g_minimal, br_rsa_pkcs1_vrfy_get_default()); + br_x509_minimal_set_ecdsa(&g_minimal, br_ec_get_default(), + br_ecdsa_vrfy_asn1_get_default()); + br_x509_minimal_set_time( + &g_minimal, + (uint32_t)(epoch_seconds / XAPT_TLS_SECONDS_PER_DAY) + XAPT_TLS_EPOCH_DAYS, + (uint32_t)(epoch_seconds % XAPT_TLS_SECONDS_PER_DAY)); + br_ssl_engine_set_x509(&g_client.eng, &g_minimal.vtable); + return 0; +} + +/* Accept exactly one leaf public key and ignore the rest of the certificate. + Used for private deployments whose key is long-lived and whose certificate + is reachable only by address, where no public chain exists to validate. */ +static int use_pinned_key(const char *rsa_modulus_hex) { + br_rsa_public_key key; + if (parse_modulus(rsa_modulus_hex) != 0) { + g_error = 80; + return -1; + } + key.n = g_modulus; + key.nlen = sizeof(g_modulus); + key.e = g_exponent; + key.elen = sizeof(g_exponent); + br_x509_knownkey_init_rsa(&g_knownkey, &key, BR_KEYTYPE_SIGN); + br_ssl_engine_set_x509(&g_client.eng, &g_knownkey.vtable); + return 0; +} + int xapt_tls_open(u64 socket, const char *server_name, const char *rsa_modulus_hex) { static const uint16_t suites[] = { + BR_TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, BR_TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256}; - br_rsa_public_key key; + int pinned = rsa_modulus_hex != 0 && rsa_modulus_hex[0] != '\0'; unsigned char entropy[32]; g_error = 0; - if (server_name == 0 || parse_modulus(rsa_modulus_hex) != 0) { + if (server_name == 0) { g_error = 80; return -1; } @@ -78,19 +135,21 @@ int xapt_tls_open(u64 socket, const char *server_name, g_deadline = xaios_clock_nanos() + UINT64_C(600000000000); br_ssl_client_zero(&g_client); br_ssl_engine_set_versions(&g_client.eng, BR_TLS12, BR_TLS12); - br_ssl_engine_set_suites(&g_client.eng, suites, 1U); + br_ssl_engine_set_suites(&g_client.eng, suites, + sizeof(suites) / sizeof(suites[0])); br_ssl_client_set_default_rsapub(&g_client); br_ssl_engine_set_default_rsavrfy(&g_client.eng); + br_ssl_engine_set_default_ecdsa(&g_client.eng); br_ssl_engine_set_default_ec(&g_client.eng); br_ssl_engine_set_hash(&g_client.eng, br_sha256_ID, &br_sha256_vtable); + br_ssl_engine_set_hash(&g_client.eng, br_sha384_ID, &br_sha384_vtable); + br_ssl_engine_set_hash(&g_client.eng, br_sha512_ID, &br_sha512_vtable); br_ssl_engine_set_prf_sha256(&g_client.eng, &br_tls12_sha256_prf); + br_ssl_engine_set_prf_sha384(&g_client.eng, &br_tls12_sha384_prf); br_ssl_engine_set_default_aes_gcm(&g_client.eng); - key.n = g_modulus; - key.nlen = sizeof(g_modulus); - key.e = g_exponent; - key.elen = sizeof(g_exponent); - br_x509_knownkey_init_rsa(&g_validator, &key, BR_KEYTYPE_SIGN); - br_ssl_engine_set_x509(&g_client.eng, &g_validator.vtable); + if (pinned ? use_pinned_key(rsa_modulus_hex) : use_chain_validation()) { + return -1; + } br_ssl_engine_set_buffer(&g_client.eng, g_io_buffer, sizeof(g_io_buffer), 1); br_ssl_engine_inject_entropy(&g_client.eng, entropy, sizeof(entropy)); if (!br_ssl_client_reset(&g_client, server_name, 0)) { diff --git a/userspace/apps/xapt_tls.h b/userspace/apps/xapt_tls.h index 6cdb3c86..6074abc3 100644 --- a/userspace/apps/xapt_tls.h +++ b/userspace/apps/xapt_tls.h @@ -3,6 +3,10 @@ #include +/* Open a TLS 1.2 session. With rsa_modulus_hex null or empty the presented + chain is validated against the compiled-in roots, including server name and + validity window; otherwise that exact leaf RSA key is required and the rest + of the certificate is ignored. */ int xapt_tls_open(u64 socket, const char *server_name, const char *rsa_modulus_hex); int xapt_tls_write(const void *data, u64 size); diff --git a/userspace/apps/xapt_trust_anchors.c b/userspace/apps/xapt_trust_anchors.c new file mode 100644 index 00000000..aa0ad5d7 --- /dev/null +++ b/userspace/apps/xapt_trust_anchors.c @@ -0,0 +1,99 @@ +/* Generated by scripts/gen-xapt-trust-anchors.py. Do not edit. */ +#include "xapt_trust_anchors.h" + +/* CN=ISRG Root X1,O=Internet Security Research Group,C=US (ISRG_Root_X1.pem) */ +static const unsigned char TA0_DN[] = { + 0x30, 0x4F, 0x31, 0x0B, 0x30, 0x09, 0x06, 0x03, 0x55, 0x04, 0x06, 0x13, + 0x02, 0x55, 0x53, 0x31, 0x29, 0x30, 0x27, 0x06, 0x03, 0x55, 0x04, 0x0A, + 0x13, 0x20, 0x49, 0x6E, 0x74, 0x65, 0x72, 0x6E, 0x65, 0x74, 0x20, 0x53, + 0x65, 0x63, 0x75, 0x72, 0x69, 0x74, 0x79, 0x20, 0x52, 0x65, 0x73, 0x65, + 0x61, 0x72, 0x63, 0x68, 0x20, 0x47, 0x72, 0x6F, 0x75, 0x70, 0x31, 0x15, + 0x30, 0x13, 0x06, 0x03, 0x55, 0x04, 0x03, 0x13, 0x0C, 0x49, 0x53, 0x52, + 0x47, 0x20, 0x52, 0x6F, 0x6F, 0x74, 0x20, 0x58, 0x31, +}; +static const unsigned char TA0_N[] = { + 0xAD, 0xE8, 0x24, 0x73, 0xF4, 0x14, 0x37, 0xF3, 0x9B, 0x9E, 0x2B, 0x57, + 0x28, 0x1C, 0x87, 0xBE, 0xDC, 0xB7, 0xDF, 0x38, 0x90, 0x8C, 0x6E, 0x3C, + 0xE6, 0x57, 0xA0, 0x78, 0xF7, 0x75, 0xC2, 0xA2, 0xFE, 0xF5, 0x6A, 0x6E, + 0xF6, 0x00, 0x4F, 0x28, 0xDB, 0xDE, 0x68, 0x86, 0x6C, 0x44, 0x93, 0xB6, + 0xB1, 0x63, 0xFD, 0x14, 0x12, 0x6B, 0xBF, 0x1F, 0xD2, 0xEA, 0x31, 0x9B, + 0x21, 0x7E, 0xD1, 0x33, 0x3C, 0xBA, 0x48, 0xF5, 0xDD, 0x79, 0xDF, 0xB3, + 0xB8, 0xFF, 0x12, 0xF1, 0x21, 0x9A, 0x4B, 0xC1, 0x8A, 0x86, 0x71, 0x69, + 0x4A, 0x66, 0x66, 0x6C, 0x8F, 0x7E, 0x3C, 0x70, 0xBF, 0xAD, 0x29, 0x22, + 0x06, 0xF3, 0xE4, 0xC0, 0xE6, 0x80, 0xAE, 0xE2, 0x4B, 0x8F, 0xB7, 0x99, + 0x7E, 0x94, 0x03, 0x9F, 0xD3, 0x47, 0x97, 0x7C, 0x99, 0x48, 0x23, 0x53, + 0xE8, 0x38, 0xAE, 0x4F, 0x0A, 0x6F, 0x83, 0x2E, 0xD1, 0x49, 0x57, 0x8C, + 0x80, 0x74, 0xB6, 0xDA, 0x2F, 0xD0, 0x38, 0x8D, 0x7B, 0x03, 0x70, 0x21, + 0x1B, 0x75, 0xF2, 0x30, 0x3C, 0xFA, 0x8F, 0xAE, 0xDD, 0xDA, 0x63, 0xAB, + 0xEB, 0x16, 0x4F, 0xC2, 0x8E, 0x11, 0x4B, 0x7E, 0xCF, 0x0B, 0xE8, 0xFF, + 0xB5, 0x77, 0x2E, 0xF4, 0xB2, 0x7B, 0x4A, 0xE0, 0x4C, 0x12, 0x25, 0x0C, + 0x70, 0x8D, 0x03, 0x29, 0xA0, 0xE1, 0x53, 0x24, 0xEC, 0x13, 0xD9, 0xEE, + 0x19, 0xBF, 0x10, 0xB3, 0x4A, 0x8C, 0x3F, 0x89, 0xA3, 0x61, 0x51, 0xDE, + 0xAC, 0x87, 0x07, 0x94, 0xF4, 0x63, 0x71, 0xEC, 0x2E, 0xE2, 0x6F, 0x5B, + 0x98, 0x81, 0xE1, 0x89, 0x5C, 0x34, 0x79, 0x6C, 0x76, 0xEF, 0x3B, 0x90, + 0x62, 0x79, 0xE6, 0xDB, 0xA4, 0x9A, 0x2F, 0x26, 0xC5, 0xD0, 0x10, 0xE1, + 0x0E, 0xDE, 0xD9, 0x10, 0x8E, 0x16, 0xFB, 0xB7, 0xF7, 0xA8, 0xF7, 0xC7, + 0xE5, 0x02, 0x07, 0x98, 0x8F, 0x36, 0x08, 0x95, 0xE7, 0xE2, 0x37, 0x96, + 0x0D, 0x36, 0x75, 0x9E, 0xFB, 0x0E, 0x72, 0xB1, 0x1D, 0x9B, 0xBC, 0x03, + 0xF9, 0x49, 0x05, 0xD8, 0x81, 0xDD, 0x05, 0xB4, 0x2A, 0xD6, 0x41, 0xE9, + 0xAC, 0x01, 0x76, 0x95, 0x0A, 0x0F, 0xD8, 0xDF, 0xD5, 0xBD, 0x12, 0x1F, + 0x35, 0x2F, 0x28, 0x17, 0x6C, 0xD2, 0x98, 0xC1, 0xA8, 0x09, 0x64, 0x77, + 0x6E, 0x47, 0x37, 0xBA, 0xCE, 0xAC, 0x59, 0x5E, 0x68, 0x9D, 0x7F, 0x72, + 0xD6, 0x89, 0xC5, 0x06, 0x41, 0x29, 0x3E, 0x59, 0x3E, 0xDD, 0x26, 0xF5, + 0x24, 0xC9, 0x11, 0xA7, 0x5A, 0xA3, 0x4C, 0x40, 0x1F, 0x46, 0xA1, 0x99, + 0xB5, 0xA7, 0x3A, 0x51, 0x6E, 0x86, 0x3B, 0x9E, 0x7D, 0x72, 0xA7, 0x12, + 0x05, 0x78, 0x59, 0xED, 0x3E, 0x51, 0x78, 0x15, 0x0B, 0x03, 0x8F, 0x8D, + 0xD0, 0x2F, 0x05, 0xB2, 0x3E, 0x7B, 0x4A, 0x1C, 0x4B, 0x73, 0x05, 0x12, + 0xFC, 0xC6, 0xEA, 0xE0, 0x50, 0x13, 0x7C, 0x43, 0x93, 0x74, 0xB3, 0xCA, + 0x74, 0xE7, 0x8E, 0x1F, 0x01, 0x08, 0xD0, 0x30, 0xD4, 0x5B, 0x71, 0x36, + 0xB4, 0x07, 0xBA, 0xC1, 0x30, 0x30, 0x5C, 0x48, 0xB7, 0x82, 0x3B, 0x98, + 0xA6, 0x7D, 0x60, 0x8A, 0xA2, 0xA3, 0x29, 0x82, 0xCC, 0xBA, 0xBD, 0x83, + 0x04, 0x1B, 0xA2, 0x83, 0x03, 0x41, 0xA1, 0xD6, 0x05, 0xF1, 0x1B, 0xC2, + 0xB6, 0xF0, 0xA8, 0x7C, 0x86, 0x3B, 0x46, 0xA8, 0x48, 0x2A, 0x88, 0xDC, + 0x76, 0x9A, 0x76, 0xBF, 0x1F, 0x6A, 0xA5, 0x3D, 0x19, 0x8F, 0xEB, 0x38, + 0xF3, 0x64, 0xDE, 0xC8, 0x2B, 0x0D, 0x0A, 0x28, 0xFF, 0xF7, 0xDB, 0xE2, + 0x15, 0x42, 0xD4, 0x22, 0xD0, 0x27, 0x5D, 0xE1, 0x79, 0xFE, 0x18, 0xE7, + 0x70, 0x88, 0xAD, 0x4E, 0xE6, 0xD9, 0x8B, 0x3A, 0xC6, 0xDD, 0x27, 0x51, + 0x6E, 0xFF, 0xBC, 0x64, 0xF5, 0x33, 0x43, 0x4F, +}; +static const unsigned char TA0_E[] = { + 0x01, 0x00, 0x01, +}; + +/* CN=ISRG Root X2,O=Internet Security Research Group,C=US (ISRG_Root_X2.pem) */ +static const unsigned char TA1_DN[] = { + 0x30, 0x4F, 0x31, 0x0B, 0x30, 0x09, 0x06, 0x03, 0x55, 0x04, 0x06, 0x13, + 0x02, 0x55, 0x53, 0x31, 0x29, 0x30, 0x27, 0x06, 0x03, 0x55, 0x04, 0x0A, + 0x13, 0x20, 0x49, 0x6E, 0x74, 0x65, 0x72, 0x6E, 0x65, 0x74, 0x20, 0x53, + 0x65, 0x63, 0x75, 0x72, 0x69, 0x74, 0x79, 0x20, 0x52, 0x65, 0x73, 0x65, + 0x61, 0x72, 0x63, 0x68, 0x20, 0x47, 0x72, 0x6F, 0x75, 0x70, 0x31, 0x15, + 0x30, 0x13, 0x06, 0x03, 0x55, 0x04, 0x03, 0x13, 0x0C, 0x49, 0x53, 0x52, + 0x47, 0x20, 0x52, 0x6F, 0x6F, 0x74, 0x20, 0x58, 0x32, +}; +static const unsigned char TA1_Q[] = { + 0x04, 0xCD, 0x9B, 0xD5, 0x9F, 0x80, 0x83, 0x0A, 0xEC, 0x09, 0x4A, 0xF3, + 0x16, 0x4A, 0x3E, 0x5C, 0xCF, 0x77, 0xAC, 0xDE, 0x67, 0x05, 0x0D, 0x1D, + 0x07, 0xB6, 0xDC, 0x16, 0xFB, 0x5A, 0x8B, 0x14, 0xDB, 0xE2, 0x71, 0x60, + 0xC4, 0xBA, 0x45, 0x95, 0x11, 0x89, 0x8E, 0xEA, 0x06, 0xDF, 0xF7, 0x2A, + 0x16, 0x1C, 0xA4, 0xB9, 0xC5, 0xC5, 0x32, 0xE0, 0x03, 0xE0, 0x1E, 0x82, + 0x18, 0x38, 0x8B, 0xD7, 0x45, 0xD8, 0x0A, 0x6A, 0x6E, 0xE6, 0x00, 0x77, + 0xFB, 0x02, 0x51, 0x7D, 0x22, 0xD8, 0x0A, 0x6E, 0x9A, 0x5B, 0x77, 0xDF, + 0xF0, 0xFA, 0x41, 0xEC, 0x39, 0xDC, 0x75, 0xCA, 0x68, 0x07, 0x0C, 0x1F, + 0xEA, +}; + +const br_x509_trust_anchor XAPT_TRUST_ANCHORS[] = { + { { (unsigned char *)TA0_DN, sizeof TA0_DN }, + BR_X509_TA_CA, + { BR_KEYTYPE_RSA, + { .rsa = { (unsigned char *)TA0_N, sizeof TA0_N, + (unsigned char *)TA0_E, sizeof TA0_E } } } }, + { { (unsigned char *)TA1_DN, sizeof TA1_DN }, + BR_X509_TA_CA, + { BR_KEYTYPE_EC, + { .ec = { 24, (unsigned char *)TA1_Q, + sizeof TA1_Q } } } }, +}; + +const size_t XAPT_TRUST_ANCHORS_COUNT = + sizeof XAPT_TRUST_ANCHORS / sizeof XAPT_TRUST_ANCHORS[0]; diff --git a/userspace/apps/xapt_trust_anchors.h b/userspace/apps/xapt_trust_anchors.h new file mode 100644 index 00000000..cf4a8817 --- /dev/null +++ b/userspace/apps/xapt_trust_anchors.h @@ -0,0 +1,11 @@ +#ifndef XAIOS_XAPT_TRUST_ANCHORS_H +#define XAIOS_XAPT_TRUST_ANCHORS_H + +#include + +/* Root certificates the updater's chain is validated against, generated from + userspace/apps/trust by scripts/gen-xapt-trust-anchors.py. */ +extern const br_x509_trust_anchor XAPT_TRUST_ANCHORS[]; +extern const size_t XAPT_TRUST_ANCHORS_COUNT; + +#endif diff --git a/userspace/init/xapt.conf b/userspace/init/xapt.conf index a61ea8ff..c4f7c033 100644 --- a/userspace/init/xapt.conf +++ b/userspace/init/xapt.conf @@ -1,5 +1,4 @@ -host=91.99.176.243 -port=8443 +host=xaios.91.99.176.243.nip.io +port=443 base=/ tls=required -tls_rsa_modulus=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 diff --git a/wiki/Current-Limitations.md b/wiki/Current-Limitations.md index df4a48a0..29d36c42 100644 --- a/wiki/Current-Limitations.md +++ b/wiki/Current-Limitations.md @@ -115,7 +115,10 @@ Progress status and ownership live only in [[Project Tracker|Project-Tracker]]. - Role, capability, replay, rollback, host-key rotation, sensitive-path denial, and secret-redaction behavior pass QEMU/OpenSSH gates but have not received an independent production security review. -- `xapt` requires TLS 1.2 with an exact RSA public-key pin and supports signed +- `xapt` requires TLS 1.2, validating the certificate chain against compiled-in + ISRG roots with server-name and validity checks, or an exact RSA public-key + pin for a private origin. Chain validation depends on a set realtime clock + and refuses an unset one. It supports signed release-root rotation, revocation, offline recovery, and rollback of an interrupted trust/catalog activation. The checked-in TLS and signing private fixtures are public; production key custody and release authorization remain diff --git a/wiki/Xapt-Package-Updates.md b/wiki/Xapt-Package-Updates.md index 39223d0a..455ab805 100644 --- a/wiki/Xapt-Package-Updates.md +++ b/wiki/Xapt-Package-Updates.md @@ -68,19 +68,26 @@ not determine OS-slot health. /apps/NAME/previous.* one rollback version ``` -The default development origin is `91.99.176.243:8443`. Configuration is plain -text, but transport security is mandatory: +The default development origin is `xaios.91.99.176.243.nip.io` over HTTPS. +Configuration is plain text, but transport security is mandatory: ```text -host=91.99.176.243 -port=8443 +host=xaios.91.99.176.243.nip.io +port=443 base=/ tls=required -tls_rsa_modulus=OPERATOR_RSA_MODULUS_HEX ``` -`xapt` uses TLS 1.2 with an exact operator-managed RSA public-key pin and -fail-closed entropy. Signed catalogs/manifests and payload hashes remain the +`xapt` uses TLS 1.2 with fail-closed entropy and validates the presented +certificate chain against the compiled-in ISRG roots, checking the server name +and the validity window. Because expiry is checked, the realtime clock must be +set; an unset clock is refused rather than silently accepted. + +Add `tls_rsa_modulus=OPERATOR_RSA_MODULUS_HEX` to require one exact leaf RSA +key instead, ignoring the rest of the certificate. That suits a private origin +reached by address, where no publicly issued chain exists. It is the wrong +choice for a publicly issued certificate, which is reissued with a fresh key +every renewal and would strand every deployed image. Signed catalogs/manifests and payload hashes remain the content authenticity layer. The client requires HTTP/1.1 with `Content-Length`; transfer encoding, compression, mirrors, proxies, deltas, dependencies, and unattended upgrades are not supported. @@ -101,15 +108,18 @@ make xapt-repository The first command creates and verifies both architecture trees under `build/xapt/repository`. The publisher re-verifies locally, synchronizes to -`/var/xaios_updater`, validates the repository Caddy configuration, and reloads -Caddy on TLS port 8443. Override the destination with `XAIOS_UPDATE_HOST` and -`XAIOS_UPDATE_ROOT`. - -Publishing requires `XAIOS_XAPT_TLS_CERT` and `XAIOS_XAPT_TLS_KEY`; the script -refuses to publish without an operator-managed identity. The public fixture may -be selected only for disposable tests with `XAIOS_ALLOW_TEST_TLS_FIXTURE=1`. -The configured `tls_rsa_modulus` must match the deployed certificate key. -Caddy exposes only the TLS listener on port 8443. +`/var/xaios_updater`, and reloads the updater's own server. Override the +destination with `XAIOS_UPDATE_HOST` and `XAIOS_UPDATE_ROOT`, and the reloaded +unit with `XAIOS_UPDATE_SERVICE`. + +The publisher handles no TLS material. A master edge in `/var/caddy` owns +`:443` for `xaios.91.99.176.243.nip.io` and forwards to the updater's own +instance, `xaios-caddy`, which serves plain HTTP on `:8090` and is the only +service publishing reloads. That edge also fronts unrelated projects, so +nothing here writes `/etc/caddy` or reloads the shared `caddy` service. + +A configured `tls_rsa_modulus` must match the deployed certificate key; with +chain validation no pin has to be re-cut when the certificate renews. The repository shape is: From 3fe8b7a7a94d3c3657fada0817fd895e60313abf Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Andr=C3=A9=20Borchert?= Date: Sun, 23 Aug 2026 21:42:17 +0700 Subject: [PATCH 10/16] Set the wall clock from NTP during boot The clock was whatever the RTC reported, and QEMU's PL031 commonly reports epoch zero, so a booted system sat in 1970. Nothing that checks a certificate validity window can work from there: xapt's chain validation against the updater refused to run at all, because validating an expiry against 1970 makes every certificate look not yet valid. ntp_sync already existed but was only reachable through an operator control operation, so nothing set the clock unless someone asked. Boot now runs one synchronization once the network is up and before any service starts. The network poll path already dispatches NTP frames and drives the retry and timeout, so this only starts the exchange and waits for it. Bounded and non-fatal. The default server is a bare address, so no DNS is involved, and a network that filters UDP/123 costs a pause of at most six seconds before boot continues on the RTC reading. An offset this large steps rather than slews, so the clock is correct immediately rather than converging over hours. Verified on QEMU aarch64: synced from the first attempt in 178ms, leaving `date` reporting source=ntp, and xapt now reaches the TLS handshake instead of refusing on an unset clock. The xapt gate passes on both architectures. Co-Authored-By: Claude Opus 5 --- kernel/core/kmain.c | 34 ++++++++++++++++++++++++++++++++++ wiki/Boot-and-Console.md | 8 ++++++++ wiki/Current-Limitations.md | 12 ++++++++---- 3 files changed, 50 insertions(+), 4 deletions(-) diff --git a/kernel/core/kmain.c b/kernel/core/kmain.c index 349e7ad5..aef3f81d 100644 --- a/kernel/core/kmain.c +++ b/kernel/core/kmain.c @@ -85,6 +85,10 @@ #define XAIOS_LIBC_TEST 0 #endif +/* Two NTP retransmits plus margin, well inside the client's own 10s + timeout, so a filtered UDP/123 costs a bounded pause and nothing more. */ +#define BOOT_NTP_DEADLINE_NS UINT64_C(6000000000) + static const char g_vmm_rodata_probe[] = "vmm-rodata"; static uint64_t g_vmm_data_probe; static virtio_block_handle_t *g_storage_admin_handle; @@ -156,6 +160,34 @@ static int run_user_app(const char *path, uint32_t pid, uint64_t capabilities) { return exit_code; } +/* Set the wall clock from NTP before any service starts. + + The clock is otherwise whatever the RTC reports, and QEMU's PL031 commonly + reports epoch zero, leaving the system in 1970. Anything that checks a + certificate validity window then sees every certificate as not-yet-valid, + which is how xapt fails against the updater's publicly issued certificate. + + Bounded and non-fatal. The default server is a bare address, so this needs + no DNS, but UDP/123 is filtered on some networks and a boot must not stall + waiting for a reply that will never arrive. */ +static void boot_sync_wall_clock(void) { + if (ntp_sync(0U) != XAIOS_ERR_BUSY) { + klog("kernel: boot ntp not started state=%u\n", + (unsigned)ntp_status().state); + return; + } + uint64_t deadline = timer_now_ns() + BOOT_NTP_DEADLINE_NS; + while (ntp_status().state == XAIOS_NTP_PENDING && + timer_now_ns() < deadline) { + network_poll_tick(); + xaios_cpu_relax(); + } + klog("kernel: boot ntp state=%u epoch_seconds=%lu source=%u\n", + (unsigned)ntp_status().state, + wall_time_now_ns() / UINT64_C(1000000000), + (unsigned)wall_time_source()); +} + static void map_mmio_range(uint64_t start, uint64_t size) { const uint64_t page_size = 4096; uint64_t page = start & ~(page_size - 1U); @@ -754,6 +786,8 @@ void kmain(const xaios_boot_info_t *boot) { } } + boot_sync_wall_clock(); + klog("kernel: starting persistent /bin/sshd service\n"); int sshd_exit = run_user_app("/bin/sshd", XAIOS_BOOT_TEST_APPS ? 18U : 3U, sshd_caps); diff --git a/wiki/Boot-and-Console.md b/wiki/Boot-and-Console.md index fa37ecd0..182f3c5e 100644 --- a/wiki/Boot-and-Console.md +++ b/wiki/Boot-and-Console.md @@ -20,6 +20,14 @@ It then reports one of these outcomes: credentials, crypto, or listener initialization fails. +Once networking is active and before any service starts, the kernel sets the +wall clock from NTP. The default server is a bare address, so this needs no +DNS. It is bounded and non-fatal: a network that filters UDP/123 costs a pause +of at most six seconds and boot continues on the RTC reading. Without this the +clock is whatever the RTC reports, and QEMU's PL031 commonly reports epoch +zero, which leaves anything checking a certificate validity window seeing every +certificate as not yet valid. Confirm the result with `date` and `ntp status`. + SSH is not opened until networking is active and a bounded IPv4 TCP connection to `1.1.1.1:443` succeeds. This checks configured external reachability without making SSH startup depend on public DNS. Failure leaves the listener closed. diff --git a/wiki/Current-Limitations.md b/wiki/Current-Limitations.md index 29d36c42..8b00714c 100644 --- a/wiki/Current-Limitations.md +++ b/wiki/Current-Limitations.md @@ -61,8 +61,12 @@ Progress status and ownership live only in [[Project Tracker|Project-Tracker]]. rollover/update policy, remain unsupported and fail closed. - The SNTP client validates request binding, server mode/version, stratum, and bounded retry/timeout behavior, then applies corrections through a monotonic - 500-ppm slew after initial calibration. QEMU's PL031 RTC may report epoch - zero, and public UDP/123 may be filtered; both conditions remain explicit. + 500-ppm slew after initial calibration. Boot performs one bounded, non-fatal + synchronization against a fixed server address before services start, and an + offset from an unset clock is stepped rather than slewed. QEMU's PL031 RTC may + report epoch zero, and public UDP/123 may be filtered; a filtered port leaves + boot on the RTC reading after a bounded pause, so both conditions remain + explicit. Production NTP authentication, source policy, oscillator characterization, and physical RTC qualification remain open. - TCP implements retained segments, cumulative and partial ACK handling, @@ -117,8 +121,8 @@ Progress status and ownership live only in [[Project Tracker|Project-Tracker]]. independent production security review. - `xapt` requires TLS 1.2, validating the certificate chain against compiled-in ISRG roots with server-name and validity checks, or an exact RSA public-key - pin for a private origin. Chain validation depends on a set realtime clock - and refuses an unset one. It supports signed + pin for a private origin. Chain validation depends on the realtime clock set + during boot and refuses an unset one. It supports signed release-root rotation, revocation, offline recovery, and rollback of an interrupted trust/catalog activation. The checked-in TLS and signing private fixtures are public; production key custody and release authorization remain From 68c6b7414b6d172d841acf449da0fc4081e13633 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Andr=C3=A9=20Borchert?= Date: Sun, 23 Aug 2026 22:06:09 +0700 Subject: [PATCH 11/16] Fix the two defects that stopped the resolver reaching any hostname A booted guest could not resolve any name at all, signed or unsigned. Two independent defects, both invisible to the gates because every gate configures an IP literal and so never resolves anything. The first is a missing capability. net_resolve is authorized by XAIOS_CAP_NET, which xapt was never granted; it held only XAIOS_CAP_NET_SOCKET. Sockets therefore worked and name resolution was rejected before a query was ever built, which is why a literal address reached TLS while every hostname failed identically whether or not it was DNSSEC-signed. The second is an off-by-one in the zone walk. child_zone_name returns the last N labels by scanning back for the Nth dot, but the last N labels are preceded by N-1 dots whenever the zone is the whole name. Asking for a zone equal to the hostname therefore always failed, and the guard that would have caught it tests zone_labels against hostname_labels before the increment that makes them equal. Every name whose apex is the name being resolved died there, which is most of them: example.com, cloudflare.com. Verified on QEMU aarch64 against live servers. cloudflare.com and example.com now complete the chain, root DNSKEY through DS(com) and DS(example.com) to the address, and xapt reaches the TLS handshake instead of failing to resolve. An unsigned delegation is still refused: nip.io has no DS, and proving that under an opt-out NSEC3 parent is not implemented, so the insecure outcome remains unavailable. That is the remaining blocker for the updater hostname. Co-Authored-By: Claude Opus 5 --- kernel/net/dns.c | 27 ++++++++++++++++----------- kernel/runtime/remote_login.c | 7 ++++++- 2 files changed, 22 insertions(+), 12 deletions(-) diff --git a/kernel/net/dns.c b/kernel/net/dns.c index ae12ae62..4a64b379 100644 --- a/kernel/net/dns.c +++ b/kernel/net/dns.c @@ -369,22 +369,27 @@ static uint8_t hostname_label_count(const char *hostname) { return count; } +/* Write the zone formed by the last `labels` labels of `hostname`. + + That zone starts just after the dot with `labels` labels to its right, so + the search needs one fewer dot than it might look. When the zone is the + hostname itself there is no such dot at all, which is the ordinary case for + any name whose apex is the name being resolved, such as example.com. */ static int child_zone_name(const char *hostname, uint8_t labels, char *out, uint32_t capacity) { if (labels == 0U || capacity == 0U) return -1; - uint8_t seen = 0U; + uint8_t total = hostname_label_count(hostname); + if (labels > total) return -1; uint32_t start = 0U; - for (uint32_t i = str_len(hostname); i > 0U; --i) { - if (hostname[i - 1U] == '.') { - if (++seen == labels) { start = i; break; } + if (labels < total) { + uint8_t seen = 0U; + for (uint32_t i = str_len(hostname); i > 0U; --i) { + if (hostname[i - 1U] == '.' && ++seen == labels) { + start = i; + break; + } } - } - if (labels == 1U) { - start = 0U; - for (uint32_t i = 0U; hostname[i] != '\0'; ++i) - if (hostname[i] == '.') start = i + 1U; - } else if (seen != labels) { - return -1; + if (seen != labels) return -1; } if (str_len(hostname + start) + 1U > capacity) return -1; str_copy(out, hostname + start, capacity); diff --git a/kernel/runtime/remote_login.c b/kernel/runtime/remote_login.c index 29f70ed4..b81db3c0 100644 --- a/kernel/runtime/remote_login.c +++ b/kernel/runtime/remote_login.c @@ -3904,9 +3904,14 @@ static const remote_app_definition_t g_remote_apps[] = { REMOTE_APP("hello", "/bin/hello", XAIOS_CAP_LOG | XAIOS_CAP_EXIT), REMOTE_APP("helloworldc99", "/bin/helloworldc99", XAIOS_CAP_CONSOLE | XAIOS_CAP_EXIT), + /* XAIOS_CAP_NET is what authorizes net_resolve. Without it xapt can open + sockets but cannot turn a name into an address, so a configured host + works only as a literal and every hostname fails identically whether or + not it is DNSSEC-signed. */ REMOTE_APP("xapt", "/bin/xapt", XAIOS_CAP_CONSOLE | XAIOS_CAP_EXIT | XAIOS_CAP_TIME | - XAIOS_CAP_FS_READ | XAIOS_CAP_FS_WRITE | XAIOS_CAP_NET_SOCKET | + XAIOS_CAP_FS_READ | XAIOS_CAP_FS_WRITE | + XAIOS_CAP_NET | XAIOS_CAP_NET_SOCKET | XAIOS_CAP_RANDOM | XAIOS_CAP_CONTROL_QUERY | XAIOS_CAP_CONTROL_ADMIN | XAIOS_CAP_UPDATE | XAIOS_CAP_ADMIN), From e37b8c426f6dd171f3c93408bb82864a3a006c83 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Andr=C3=A9=20Borchert?= Date: Sun, 23 Aug 2026 22:12:44 +0700 Subject: [PATCH 12/16] Fetch updates over plain HTTP for now The updater hostname still does not resolve: nip.io is an unsigned delegation and the resolver has no insecure outcome, so the name is refused as bogus. The :8090 fallback that field devices used is closed, leaving no address-based path to the origin. The edge does serve the origin over plain HTTP on :80, so a client that dials the address while still naming the origin reaches it today. xapt used the configured host for both the dial and the Host header and so could not express that; `address` now overrides the dial target while `host` remains the origin identity, used for the Host header and for any certificate check. Without `address` the client resolves `host` exactly as before. The shipped configuration uses that path with tls=off. Update authenticity is unaffected: catalogs and manifests are signed and every artifact carries a sha256, so a tampered payload is rejected whatever the transport. What is given up is confidentiality and transport integrity, and an observer can see which artifacts a host fetches. Restoring tls=required with port=443 needs only the resolver to reach the name. Verified on QEMU aarch64 against the live origin: `xapt update` fetches and activates the signed catalog. The xapt gate passes on both architectures. Co-Authored-By: Claude Opus 5 --- userspace/apps/xapt.c | 12 +++++++++++- userspace/init/xapt.conf | 5 +++-- wiki/Current-Limitations.md | 14 +++++++++++--- wiki/Xapt-Package-Updates.md | 31 +++++++++++++++++++++++-------- 4 files changed, 48 insertions(+), 14 deletions(-) diff --git a/userspace/apps/xapt.c b/userspace/apps/xapt.c index cd2d5270..5e3cc034 100644 --- a/userspace/apps/xapt.c +++ b/userspace/apps/xapt.c @@ -15,6 +15,11 @@ typedef struct xapt_config { char host[XAPT_HOST_BYTES]; + /* Optional literal to dial instead of resolving `host`. The name still + identifies the origin: it is what goes in the Host header and what any + certificate is checked against. Set this to reach an origin whose name + the resolver cannot yet return, and drop it once it can. */ + char address[XAPT_HOST_BYTES]; char base[64]; u64 port; u32 tls_required; @@ -228,7 +233,8 @@ static int http_get(const xapt_config_t *config, const char *catalog_path, g_http_error = 1U; return -1; } - if (resolve_host(config->host, &address) != 0) { + if (resolve_host(config->address[0] != '\0' ? config->address : config->host, + &address) != 0) { g_http_error = 2U; return -1; } @@ -380,6 +386,10 @@ static int load_config(xapt_config_t *config) { if (copy_text(config->host, sizeof(config->host), g_buffer + start + 5U, length - 5U) != 0) return -1; + } else if (text_starts(g_buffer + start, "address=")) { + if (copy_text(config->address, sizeof(config->address), + g_buffer + start + 8U, length - 8U) != 0) + return -1; } else if (text_starts(g_buffer + start, "base=")) { if (copy_text(config->base, sizeof(config->base), g_buffer + start + 5U, length - 5U) != 0) diff --git a/userspace/init/xapt.conf b/userspace/init/xapt.conf index c4f7c033..bc45958b 100644 --- a/userspace/init/xapt.conf +++ b/userspace/init/xapt.conf @@ -1,4 +1,5 @@ host=xaios.91.99.176.243.nip.io -port=443 +address=91.99.176.243 +port=80 base=/ -tls=required +tls=off diff --git a/wiki/Current-Limitations.md b/wiki/Current-Limitations.md index 8b00714c..b59fe101 100644 --- a/wiki/Current-Limitations.md +++ b/wiki/Current-Limitations.md @@ -58,7 +58,11 @@ Progress status and ownership live only in [[Project Tracker|Project-Tracker]]. cache, and DNS-over-TCP fallback. It locally validates DNSKEY, DS, and RRSIG chains from compiled root DS anchors and accepts signed exact-owner NSEC NODATA proofs. NXDOMAIN, NSEC3, CNAME/DNAME and wildcard synthesis, plus production root-anchor - rollover/update policy, remain unsupported and fail closed. + rollover/update policy, remain unsupported and fail closed. DNSSEC has three + outcomes and the resolver implements two: an unsigned delegation, whose + absent DS can only be proven under the opt-out NSEC3 its parent uses, is + refused as bogus rather than accepted as insecure. Names under such a + delegation, `nip.io` among them, therefore do not resolve. - The SNTP client validates request binding, server mode/version, stratum, and bounded retry/timeout behavior, then applies corrections through a monotonic 500-ppm slew after initial calibration. Boot performs one bounded, non-fatal @@ -119,10 +123,14 @@ Progress status and ownership live only in [[Project Tracker|Project-Tracker]]. - Role, capability, replay, rollback, host-key rotation, sensitive-path denial, and secret-redaction behavior pass QEMU/OpenSSH gates but have not received an independent production security review. -- `xapt` requires TLS 1.2, validating the certificate chain against compiled-in +- `xapt` supports TLS 1.2, validating the certificate chain against compiled-in ISRG roots with server-name and validity checks, or an exact RSA public-key pin for a private origin. Chain validation depends on the realtime clock set - during boot and refuses an unset one. It supports signed + during boot and refuses an unset one. The shipped configuration currently + sets `tls=off` and fetches over plain HTTP, because the resolver cannot + return an address for the origin name; signed catalogs and per-artifact + hashes remain the authenticity layer, and transport confidentiality is + forfeited until that is restored. It supports signed release-root rotation, revocation, offline recovery, and rollback of an interrupted trust/catalog activation. The checked-in TLS and signing private fixtures are public; production key custody and release authorization remain diff --git a/wiki/Xapt-Package-Updates.md b/wiki/Xapt-Package-Updates.md index 455ab805..14c78bab 100644 --- a/wiki/Xapt-Package-Updates.md +++ b/wiki/Xapt-Package-Updates.md @@ -68,20 +68,35 @@ not determine OS-slot health. /apps/NAME/previous.* one rollback version ``` -The default development origin is `xaios.91.99.176.243.nip.io` over HTTPS. -Configuration is plain text, but transport security is mandatory: +The default development origin is `xaios.91.99.176.243.nip.io`. The shipped +configuration reaches it over plain HTTP: ```text host=xaios.91.99.176.243.nip.io -port=443 +address=91.99.176.243 +port=80 base=/ -tls=required +tls=off ``` -`xapt` uses TLS 1.2 with fail-closed entropy and validates the presented -certificate chain against the compiled-in ISRG roots, checking the server name -and the validity window. Because expiry is checked, the realtime clock must be -set; an unset clock is refused rather than silently accepted. +`address` is the literal to dial. The name still identifies the origin: it is +what goes in the `Host` header, and what a certificate would be checked +against. The two are separate here because the resolver cannot yet return an +address for this name, an unsigned delegation it treats as bogus; once it can, +`address` can be dropped. Without `address` the client resolves `host`. + +`tls=off` is a deliberate interim setting, not a default to keep. Update +authenticity does not depend on it: catalogs and manifests are signed and every +artifact carries a `sha256`, so a tampered payload is rejected whatever the +transport. What plain HTTP gives up is confidentiality and transport integrity +of the exchange itself, and an observer can see which artifacts a host fetches. +Restore `tls=required` with `port=443` once the resolver reaches the name. + +With `tls=required`, `xapt` uses TLS 1.2 with fail-closed entropy and validates +the presented certificate chain against the compiled-in ISRG roots, checking +the server name and the validity window. Because expiry is checked, the +realtime clock must be set; boot synchronizes it, and an unset clock is refused +rather than silently accepted. Add `tls_rsa_modulus=OPERATOR_RSA_MODULUS_HEX` to require one exact leaf RSA key instead, ignoring the rest of the certificate. That suits a private origin From 303c452ed15475b5ce123ee818e954f7d2ffc645 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Andr=C3=A9=20Borchert?= Date: Sun, 23 Aug 2026 22:30:26 +0700 Subject: [PATCH 13/16] Document rebuilding over a stale persistent disk The active administration configuration lives in persistent storage and a stored record takes precedence over the compiled default, but the persistent disk is not recreated by a rebuild. An image rebuilt over a disk written by an earlier key-only build therefore inherits password=disabled from that disk and boots with the console locked, whatever the new build was configured for. The credentials are packaged correctly and the boot log reports the real cause, but nothing about `make image` suggests the disk is what decided it. Co-Authored-By: Claude Opus 5 --- wiki/Boot-and-Console.md | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/wiki/Boot-and-Console.md b/wiki/Boot-and-Console.md index 182f3c5e..38699de0 100644 --- a/wiki/Boot-and-Console.md +++ b/wiki/Boot-and-Console.md @@ -70,6 +70,29 @@ not create a shell session. The same byte-oriented console interface accepts USB HID boot-keyboard input from the default xHCI device on both QEMU ARM64 and QEMU x86_64; PL011 serial remains available when no USB keyboard is attached. +## Rebuilding over an existing persistent disk + +The active administration configuration lives in persistent storage, and a +stored record takes precedence over the compiled default. `build/xaios-persistent.img` +is not recreated by a rebuild, so an image rebuilt over a disk written by an +earlier key-only build inherits `password=disabled` from that disk and comes up +with the console locked, whatever the new build was configured for. The boot +log names it: + +```text +admin-control: initialized schema=1 generation=1 password=disabled +``` + +Discard the stale state to get the development credentials the build intended: + +```sh +make clean-persistent +make image +``` + +This deletes persistent state, so use it on development images rather than on a +disk holding anything worth keeping. + ## Verbose diagnostics Normal boot avoids scrolling logs. For failure analysis: From 78999d456215268cfe402fb6d4fe0c9bd92546e4 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Andr=C3=A9=20Borchert?= Date: Sun, 23 Aug 2026 23:13:44 +0700 Subject: [PATCH 14/16] Audit pass: fix eight defects and mount /bin into the VFS MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit A full sweep, mechanical scans plus a clang-analyzer pass over every production C file plus an adversarial re-read of everything this branch changed. Fixes, in rough order of consequence: /bin is now the boot image mounted read-only into the VFS. The shell could run /bin/htop while ls showed an empty directory, because the userspace ls lists through the VFS and the VFS had never heard of the initramfs. The image's flat path table gains derived directory semantics in initramfs.c, a small read-only adapter exposes it, and vfs_list also names mount points in their parent's listing, so /bin and /models appear in ls /. The console builtin cd accepts image-backed directories, and the test-image kernel ls merges image entries for parity. panic.h carried two copies of its body from a bad merge, and panic_at was not declared noreturn. The attribute is load-bearing: kassert(p != 0) guards the dereference after it only if tools know a failed assertion cannot fall through — its absence made 15 files' worth of analyzer noise out of correctly guarded code. Also gained printf format checking, which found zero mismatched call sites. The boot screen's IPv6 renderer emitted invalid text whenever the zero run reached the last group ("2001:db8:1:2:3:4:" — one colon short) and ":::1" for a leading run. The marker now carries both its colons and the group after it adds none. Proven by a host transcription: 3 of 7 curated cases failed before, 0 of 256 exhaustive patterns fail after. Two seqlock readers in user.c compared an uninitialized sequence value when a writer was mid-update; the retry happened by luck. The retry is now forced through a defined value. control_protocol_dispatch tolerated a null response_bytes at entry while every handler's success path dereferences it; nulls are now rejected once at dispatch. xapt's pinned TLS mode offered the ECDSA suite first, which would steer a dual-certificate origin into a suite an RSA pin can never satisfy; each validation mode now offers only what it can verify. Its config parser could read past the buffer for a 4 KiB config and capped header bytes against the wrong buffer's size; both bounded. One dead store removed from the DNS stage machine. Verified: compile-check, hosted tests, the local console gate and the xapt gate on both architectures all pass; the analyzer reports zero warnings across kernel, engine, boot and the SSH stack, with two documented false positives remaining elsewhere. Co-Authored-By: Claude Opus 5 --- kernel/core/kmain.c | 3 + kernel/fs/initramfs.c | 53 ++++++++ kernel/fs/vfs.c | 51 ++++++- kernel/fs/vfs_initramfs.c | 213 ++++++++++++++++++++++++++++++ kernel/include/xaios/initramfs.h | 15 +++ kernel/include/xaios/panic.h | 15 +-- kernel/net/dns.c | 3 +- kernel/runtime/control_protocol.c | 9 +- kernel/runtime/remote_login.c | 51 ++++++- kernel/user/user.c | 5 + scripts/build-image.sh | 2 + userspace/apps/xapt.c | 11 +- userspace/apps/xapt_tls.c | 17 ++- userspace/sshd/sshd.c | 9 +- wiki/Applications.md | 5 + 15 files changed, 441 insertions(+), 21 deletions(-) create mode 100644 kernel/fs/vfs_initramfs.c diff --git a/kernel/core/kmain.c b/kernel/core/kmain.c index aef3f81d..ee8e7cf5 100644 --- a/kernel/core/kmain.c +++ b/kernel/core/kmain.c @@ -456,6 +456,9 @@ void kmain(const xaios_boot_info_t *boot) { } operations_init(persistent_status == XAIOS_OK ? 1U : 0U); kassert(vfs_mount_mutable_root() == XAIOS_OK); + /* Expose the boot image's /bin read-only, so the userspace ls that ships + as /bin/ls can list the directory it lives in. */ + kassert(vfs_mount_initramfs("/bin") == XAIOS_OK); klog("vfs: MutableFS mounted at /\n"); /* The boot loader selected this immutable system slot. Admit and validate diff --git a/kernel/fs/initramfs.c b/kernel/fs/initramfs.c index b853b871..ee9f7030 100644 --- a/kernel/fs/initramfs.c +++ b/kernel/fs/initramfs.c @@ -55,6 +55,12 @@ static char g_config_child_service_restart[INITFS_MODE_MAX]; static xaios_initramfs_config_t g_config; static uint32_t g_file_count; +static uint32_t str_len(const char *value) { + uint32_t length = 0U; + while (value[length] != '\0') ++length; + return length; +} + static int str_eq(const char *a, const char *b) { while (*a != '\0' && *b != '\0') { if (*a != *b) { @@ -410,6 +416,53 @@ xaios_status_t initramfs_lookup(const char *path, return XAIOS_ERR_NOT_FOUND; } +uint32_t initramfs_file_count(void) { return g_file_count; } + +const xaios_initramfs_file_t *initramfs_file_at(uint32_t index) { + return index < g_file_count ? &g_files[index] : 0; +} + +/* The image stores flat absolute paths and no directory records, so + directory shape is derived: a directory exists when any file path extends + it, and its children are the first path components under it. */ +int initramfs_child_at(const char *directory, uint32_t index, char *name, + uint64_t name_capacity, int *is_directory) { + const xaios_initramfs_file_t *file = initramfs_file_at(index); + uint32_t dir_length = 0U; + if (directory == 0 || name == 0 || is_directory == 0 || file == 0 || + file->path == 0 || directory[0] != '/') { + return 0; + } + dir_length = str_len(directory); + if (dir_length > 1U) { + uint32_t i = 0U; + while (i < dir_length && file->path[i] == directory[i]) ++i; + if (i != dir_length || file->path[i] != '/') return 0; + } + const char *remainder = + file->path + (dir_length == 1U ? 1U : dir_length + 1U); + uint64_t component = 0U; + while (remainder[component] != '\0' && remainder[component] != '/') + ++component; + if (component == 0U || component + 1U > name_capacity) return 0; + for (uint64_t i = 0U; i < component; ++i) name[i] = remainder[i]; + name[component] = '\0'; + *is_directory = remainder[component] == '/'; + return 1; +} + +int initramfs_directory_exists(const char *directory) { + char name[64]; + int is_directory = 0; + if (directory == 0 || directory[0] != '/') return 0; + if (directory[1] == '\0') return 1; + for (uint32_t i = 0U; i < g_file_count; ++i) { + if (initramfs_child_at(directory, i, name, sizeof(name), &is_directory)) + return 1; + } + return 0; +} + const xaios_initramfs_config_t *initramfs_config(void) { return g_config.valid != 0 ? &g_config : 0; } diff --git a/kernel/fs/vfs.c b/kernel/fs/vfs.c index 7a91f25c..3171f218 100644 --- a/kernel/fs/vfs.c +++ b/kernel/fs/vfs.c @@ -545,12 +545,59 @@ static xaios_status_t vfs_list_locked(const char *path, char *buffer, uint64_t c } xaios_vfs_resolution_t resolution; vfs_mount_record_t *mount = 0; + char normalized[XAIOS_VFS_PATH_MAX]; xaios_status_t status = resolve_operation(path, &resolution, &mount); if (status != XAIOS_OK || mount->ops->list == 0) { return status != XAIOS_OK ? status : XAIOS_ERR_UNSUPPORTED; } - return mount->ops->list(mount->context, resolution.relative_path, buffer, - capacity, out_size); + status = mount->ops->list(mount->context, resolution.relative_path, buffer, + capacity, out_size); + if (status != XAIOS_OK || normalize_path(path, normalized) != XAIOS_OK) { + return status; + } + /* A mount point is a directory entry of its parent, but the parent's + backend has never heard of it: without this, /bin is fully usable yet + absent from a listing of /. Append the basename of every mount rooted + one level below the listed directory, unless the backend already named + it. */ + uint64_t base_length = string_length(normalized); + if (base_length == 1U) base_length = 0U; + for (uint32_t index = 0U; index < XAIOS_VFS_MAX_MOUNTS; ++index) { + const vfs_mount_record_t *candidate = &g_mounts[index]; + const char *name; + uint64_t name_length = 0U; + if (candidate->active == 0U || candidate == mount) continue; + if (!mount_matches(normalized, candidate->path) || + string_length(candidate->path) <= base_length) { + continue; + } + name = candidate->path + base_length + 1U; + while (name[name_length] != '\0' && name[name_length] != '/') + ++name_length; + if (name_length == 0U || name[name_length] == '/') continue; + /* Skip when the backend listed the same name already. */ + { + uint64_t line = 0U; + int present = 0; + while (line < *out_size && present == 0) { + uint64_t end = line; + while (end < *out_size && buffer[end] != '\n') ++end; + if (end - line == name_length) { + uint64_t i = 0U; + while (i < name_length && buffer[line + i] == name[i]) ++i; + if (i == name_length) present = 1; + } + line = end + 1U; + } + if (present != 0) continue; + } + if (*out_size + name_length + 1U > capacity) return XAIOS_ERR_NO_MEMORY; + for (uint64_t i = 0U; i < name_length; ++i) + buffer[*out_size + i] = name[i]; + buffer[*out_size + name_length] = '\n'; + *out_size += name_length + 1U; + } + return XAIOS_OK; } diff --git a/kernel/fs/vfs_initramfs.c b/kernel/fs/vfs_initramfs.c new file mode 100644 index 00000000..309b2ee1 --- /dev/null +++ b/kernel/fs/vfs_initramfs.c @@ -0,0 +1,213 @@ +#include +#include + +/* Read-only VFS view of the boot image, so userspace utilities can list and + read what the kernel loads from it. Without this, /bin exists only as the + kernel's private launch table: the shell can run /bin/htop while ls shows + an empty directory, which reads as a broken system rather than a design. + + The image is immutable after initramfs_init and the mount is declared + read-only, so the adapter carries no locking and no mutation entry points. + Backend handles are the file's table index plus one, so zero stays the + "no handle" value. */ + +#define INITRAMFS_VFS_NAME_MAX 64U + +static char g_mount_prefix[XAIOS_VFS_PATH_MAX]; + +static xaios_status_t absolute_path(const char *relative, char *out, + uint64_t capacity) { + uint64_t used = 0U; + const char *prefix = g_mount_prefix; + if (relative == 0 || relative[0] != '/') return XAIOS_ERR_INVALID; + while (prefix[used] != '\0') { + if (used + 1U >= capacity) return XAIOS_ERR_INVALID; + out[used] = prefix[used]; + ++used; + } + /* The mount root itself arrives as "/": the prefix already names it. */ + if (relative[1] != '\0') { + for (uint64_t i = 0U; relative[i] != '\0'; ++i) { + if (used + 1U >= capacity) return XAIOS_ERR_INVALID; + out[used++] = relative[i]; + } + } + out[used] = '\0'; + return XAIOS_OK; +} + +static xaios_status_t find_file(const char *relative, uint32_t *out_index) { + char path[XAIOS_VFS_PATH_MAX]; + xaios_status_t status = absolute_path(relative, path, sizeof(path)); + if (status != XAIOS_OK) return status; + for (uint32_t i = 0U; i < initramfs_file_count(); ++i) { + const xaios_initramfs_file_t *file = initramfs_file_at(i); + uint64_t j = 0U; + while (file->path[j] != '\0' && file->path[j] == path[j]) ++j; + if (file->path[j] == '\0' && path[j] == '\0') { + *out_index = i; + return XAIOS_OK; + } + } + return XAIOS_ERR_NOT_FOUND; +} + +static xaios_status_t initramfs_vfs_open(void *context, const char *path, + uint32_t flags, uint64_t *handle) { + uint32_t index = 0U; + (void)context; + if (handle == 0 || + (flags & (XAIOS_VFS_OPEN_WRITE | XAIOS_VFS_OPEN_CREATE | + XAIOS_VFS_OPEN_TRUNCATE)) != 0U) { + return XAIOS_ERR_INVALID; + } + if (find_file(path, &index) != XAIOS_OK) return XAIOS_ERR_NOT_FOUND; + *handle = (uint64_t)index + 1U; + return XAIOS_OK; +} + +static xaios_status_t initramfs_vfs_close(void *context, uint64_t handle) { + (void)context; + return handle != 0U && handle <= initramfs_file_count() ? XAIOS_OK + : XAIOS_ERR_INVALID; +} + +static int64_t initramfs_vfs_pread(void *context, uint64_t handle, + void *buffer, uint64_t length, + uint64_t offset) { + const xaios_initramfs_file_t *file; + const uint8_t *base; + uint8_t *out = (uint8_t *)buffer; + (void)context; + if (buffer == 0 || handle == 0U || handle > initramfs_file_count()) { + return -1; + } + file = initramfs_file_at((uint32_t)(handle - 1U)); + if (file == 0 || file->base == 0) return -1; + if (offset >= file->size) return 0; + if (length > file->size - offset) length = file->size - offset; + if (length > INT64_MAX) return -1; + base = (const uint8_t *)file->base + offset; + for (uint64_t i = 0U; i < length; ++i) out[i] = base[i]; + return (int64_t)length; +} + +static xaios_status_t initramfs_vfs_stat(void *context, const char *path, + xaios_vfs_stat_t *stat) { + char absolute[XAIOS_VFS_PATH_MAX]; + uint32_t index = 0U; + (void)context; + if (stat == 0) return XAIOS_ERR_INVALID; + stat->block_count = 0U; + stat->generation = 0U; + stat->content_hash = 0U; + if (find_file(path, &index) == XAIOS_OK) { + const xaios_initramfs_file_t *file = initramfs_file_at(index); + stat->type = 2U; + stat->size = file->size; + stat->content_hash = file->content_hash; + return XAIOS_OK; + } + if (absolute_path(path, absolute, sizeof(absolute)) == XAIOS_OK && + initramfs_directory_exists(absolute) != 0) { + stat->type = 1U; + stat->size = 0U; + return XAIOS_OK; + } + return XAIOS_ERR_NOT_FOUND; +} + +static xaios_status_t initramfs_vfs_statfs(void *context, + xaios_vfs_statfs_t *statfs) { + uint64_t total = 0U; + (void)context; + if (statfs == 0) return XAIOS_ERR_INVALID; + for (uint32_t i = 0U; i < initramfs_file_count(); ++i) { + total += initramfs_file_at(i)->size; + } + statfs->total_bytes = total; + statfs->allocated_bytes = total; + statfs->free_bytes = 0U; + statfs->reserved_bytes = 0U; + statfs->file_count = initramfs_file_count(); + statfs->directory_count = 0U; + statfs->generation = 1U; + statfs->block_size = 1U; + statfs->read_only = 1U; + statfs->format_version = 1U; + return XAIOS_OK; +} + +static xaios_status_t initramfs_vfs_list(void *context, const char *path, + char *buffer, uint64_t capacity, + uint64_t *out_size) { + char absolute[XAIOS_VFS_PATH_MAX]; + uint64_t used = 0U; + int found = 0; + (void)context; + if (buffer == 0 || out_size == 0) return XAIOS_ERR_INVALID; + if (absolute_path(path, absolute, sizeof(absolute)) != XAIOS_OK) { + return XAIOS_ERR_INVALID; + } + if (initramfs_directory_exists(absolute) == 0) return XAIOS_ERR_NOT_FOUND; + for (uint32_t i = 0U; i < initramfs_file_count(); ++i) { + char name[INITRAMFS_VFS_NAME_MAX]; + int is_directory = 0; + if (initramfs_child_at(absolute, i, name, sizeof(name), &is_directory) == + 0) { + continue; + } + if (is_directory != 0) { + /* Subdirectories repeat for every file below them; keep the first. */ + char earlier[INITRAMFS_VFS_NAME_MAX]; + int earlier_directory = 0; + uint32_t seen = 0U; + for (uint32_t j = 0U; j < i && seen == 0U; ++j) { + if (initramfs_child_at(absolute, j, earlier, sizeof(earlier), + &earlier_directory) != 0 && + earlier_directory != 0) { + uint32_t k = 0U; + while (earlier[k] != '\0' && earlier[k] == name[k]) ++k; + if (earlier[k] == '\0' && name[k] == '\0') seen = 1U; + } + } + if (seen != 0U) continue; + } + for (uint64_t j = 0U; name[j] != '\0'; ++j) { + if (used + 2U > capacity) return XAIOS_ERR_NO_MEMORY; + buffer[used++] = name[j]; + } + if (used + 1U > capacity) return XAIOS_ERR_NO_MEMORY; + buffer[used++] = '\n'; + found = 1; + } + (void)found; + *out_size = used; + return XAIOS_OK; +} + +static const xaios_vfs_backend_ops_t k_initramfs_ops = { + initramfs_vfs_open, initramfs_vfs_close, initramfs_vfs_pread, + 0 /* pwrite */, 0 /* fsync */, 0 /* truncate */, + 0 /* fallocate */, initramfs_vfs_stat, initramfs_vfs_statfs, + 0 /* mkdir */, 0 /* rmdir */, 0 /* unlink */, + 0 /* rename */, initramfs_vfs_list, +}; + +xaios_status_t vfs_mount_initramfs(const char *mount_path) { + uint64_t i = 0U; + if (mount_path == 0 || mount_path[0] != '/' || mount_path[1] == '\0') { + return XAIOS_ERR_INVALID; + } + while (mount_path[i] != '\0') { + if (i + 1U >= sizeof(g_mount_prefix)) return XAIOS_ERR_INVALID; + g_mount_prefix[i] = mount_path[i]; + ++i; + } + g_mount_prefix[i] = '\0'; + if (initramfs_directory_exists(g_mount_prefix) == 0) { + return XAIOS_ERR_NOT_FOUND; + } + return vfs_mount(mount_path, &k_initramfs_ops, 0, + XAIOS_VFS_MOUNT_READ_ONLY); +} diff --git a/kernel/include/xaios/initramfs.h b/kernel/include/xaios/initramfs.h index cb05c972..5eff8aeb 100644 --- a/kernel/include/xaios/initramfs.h +++ b/kernel/include/xaios/initramfs.h @@ -25,6 +25,21 @@ typedef struct xaios_initramfs_config { } xaios_initramfs_config_t; xaios_status_t initramfs_init(void); + +/* Read-only enumeration of the loaded image, for directory listings. The + table is immutable after initramfs_init, so no locking is involved. */ +uint32_t initramfs_file_count(void); +const xaios_initramfs_file_t *initramfs_file_at(uint32_t index); + +/* Derived directory shape over the image's flat path table. A directory + exists when any file path extends it; children are first components. */ +int initramfs_child_at(const char *directory, uint32_t index, char *name, + uint64_t name_capacity, int *is_directory); +int initramfs_directory_exists(const char *directory); + +/* Mount the image read-only into the VFS at the given directory, typically + "/bin", so userspace utilities can list and read what the kernel loads. */ +xaios_status_t vfs_mount_initramfs(const char *mount_path); xaios_status_t initramfs_lookup(const char *path, const xaios_initramfs_file_t **file); const xaios_initramfs_config_t *initramfs_config(void); diff --git a/kernel/include/xaios/panic.h b/kernel/include/xaios/panic.h index b6bcbb26..54a54be5 100644 --- a/kernel/include/xaios/panic.h +++ b/kernel/include/xaios/panic.h @@ -7,17 +7,14 @@ * On fatal error: dumps registers + stack trace to UART with ANSI cyan * background, then halts forever (no auto-reboot) so the operator can * read the diagnostics. + * + * noreturn is load-bearing beyond codegen: kassert(pointer != 0) guards + * every dereference that follows it only if the compiler and analyzers + * know a failed assertion never falls through. */ -void panic_at(const char *file, int line, const char *fmt, ...); - -#define panic(...) panic_at(__FILE__, __LINE__, __VA_ARGS__) - -#endif -#ifndef XAIOS_PANIC_H -#define XAIOS_PANIC_H - -void panic_at(const char *file, int line, const char *fmt, ...); +void panic_at(const char *file, int line, const char *fmt, ...) + __attribute__((noreturn, format(printf, 3, 4))); #define panic(...) panic_at(__FILE__, __LINE__, __VA_ARGS__) diff --git a/kernel/net/dns.c b/kernel/net/dns.c index 4a64b379..de011b73 100644 --- a/kernel/net/dns.c +++ b/kernel/net/dns.c @@ -509,7 +509,8 @@ xaios_status_t dns_process_message(const uint8_t *message, uint32_t length, ++g_reject_count; return XAIOS_ERR_INVALID; } - position += 4U; + /* The stage verifiers re-parse the whole message themselves, so nothing + consumes an offset past the question section here. */ xaios_status_t status = XAIOS_ERR_INVALID; uint64_t wall_ns = wall_time_now_ns(); if (g_pending.dnssec_stage == DNSSEC_STAGE_ROOT_DNSKEY) { diff --git a/kernel/runtime/control_protocol.c b/kernel/runtime/control_protocol.c index 8de1ba56..0c4db041 100644 --- a/kernel/runtime/control_protocol.c +++ b/kernel/runtime/control_protocol.c @@ -2149,9 +2149,14 @@ xaios_status_t control_protocol_dispatch( xaios_control_role_t authenticated_role) { xaios_control_request_header_t request; counter_increment(&g_control_requests); - if (response_bytes != 0) { - *response_bytes = 0U; + /* Every handler's success path writes the response and its size without + rechecking these, so the guarantee has to be made once here. Tolerating + a null response_bytes at entry while handlers dereference it was an + inconsistency waiting for a caller to find it. */ + if (response == 0 || response_bytes == 0) { + return XAIOS_ERR_INVALID; } + *response_bytes = 0U; if (request_bytes == 0 || request_size < sizeof(request)) { return write_error(response, response_capacity, response_bytes, 0U, 0U, XAIOS_CONTROL_STATUS_INVALID_REQUEST); diff --git a/kernel/runtime/remote_login.c b/kernel/runtime/remote_login.c index b81db3c0..9fed190f 100644 --- a/kernel/runtime/remote_login.c +++ b/kernel/runtime/remote_login.c @@ -1127,9 +1127,24 @@ static xaios_status_t handle_ls(const char *args, char *output, explicit_path[0] == '\0' ? resolved : explicit_path, target_stat.size, target_stat.type, long_form); } + { + const xaios_initramfs_file_t *image_file = 0; + if (initramfs_lookup(resolved, &image_file) == XAIOS_OK && + initramfs_directory_exists(resolved) == 0) { + return append_ls_entry(output, output_capacity, output_bytes, + explicit_path[0] == '\0' ? resolved + : explicit_path, + image_file->size, 2U, long_form); + } + } + int image_directory = initramfs_directory_exists(resolved); xaios_status_t list_status = mutable_fs_list(resolved, listing, sizeof(listing), &listing_size); + if (image_directory != 0 && list_status != XAIOS_OK) { + list_status = XAIOS_OK; + listing_size = 0U; + } if ((list_status != XAIOS_OK && (list_status != XAIOS_ERR_NO_MEMORY || listing_size == 0U)) || listing_size > sizeof(listing)) { @@ -1179,6 +1194,39 @@ static xaios_status_t handle_ls(const char *args, char *output, } line_start = line_end + 1U; } + /* Merge the boot image's view of this directory. MutableFS took its turn + above, so anything it can stat is already listed and is skipped here; + synthetic subdirectories are deduplicated against earlier image files. */ + for (uint32_t i = 0U; i < initramfs_file_count(); ++i) { + char name[XAIOS_MFS_PATH_MAX]; + int is_directory = 0; + if (initramfs_child_at(resolved, i, name, sizeof(name), &is_directory) == 0) + continue; + if (!show_all && is_hidden_name(name) != 0) continue; + char child[XAIOS_MFS_PATH_MAX]; + xaios_mfs_stat_t child_stat; + if (path_join(child, sizeof(child), resolved, name) != XAIOS_OK) continue; + if (mutable_fs_stat(child, &child_stat) == XAIOS_OK) continue; + if (is_directory != 0) { + uint32_t seen = 0U; + for (uint32_t j = 0U; j < i && seen == 0U; ++j) { + char earlier[XAIOS_MFS_PATH_MAX]; + int earlier_dir = 0; + if (initramfs_child_at(resolved, j, earlier, sizeof(earlier), + &earlier_dir) != 0 && + earlier_dir != 0 && string_equal(earlier, name) == 1U) + seen = 1U; + } + if (seen != 0U) continue; + } + const xaios_initramfs_file_t *file = initramfs_file_at(i); + if (append_ls_entry(output, output_capacity, output_bytes, name, + is_directory != 0 ? 0U : file->size, + is_directory != 0 ? 1U : 2U, long_form) != XAIOS_OK) { + return command_fail(output, output_capacity, output_bytes, + "ls: output too large"); + } + } return XAIOS_OK; } @@ -1869,7 +1917,8 @@ static xaios_status_t handle_cd(const char *arg, char *output, output_append(output, output_capacity, output_bytes, "\n"); return XAIOS_OK; } - if (mutable_fs_stat(resolved, &stat) != XAIOS_OK || stat.type != 1U) { + if ((mutable_fs_stat(resolved, &stat) != XAIOS_OK || stat.type != 1U) && + initramfs_directory_exists(resolved) == 0) { return command_fail(output, output_capacity, output_bytes, "cd: not a directory"); } diff --git a/kernel/user/user.c b/kernel/user/user.c index 64d72a04..5e48734f 100644 --- a/kernel/user/user.c +++ b/kernel/user/user.c @@ -218,6 +218,9 @@ static uint64_t process_runtime_read(const xaios_user_process_t *process, do { before = __atomic_load_n(&process->runtime_sequence, __ATOMIC_ACQUIRE); if ((before & 1U) != 0U) { + /* A writer is mid-update. Force the retry through a defined value + rather than letting the loop test read an unwritten `after`. */ + after = before; continue; } runtime = process->runtime_ns; @@ -240,6 +243,8 @@ static uint64_t cpu_usage_read(const xaios_cpu_usage_record_t *usage, do { before = __atomic_load_n(&usage->sequence, __ATOMIC_ACQUIRE); if ((before & 1U) != 0U) { + /* Same defined-retry as the runtime reader above. */ + after = before; continue; } busy = usage->busy_ns; diff --git a/scripts/build-image.sh b/scripts/build-image.sh index fb8a3e6a..9495cd48 100755 --- a/scripts/build-image.sh +++ b/scripts/build-image.sh @@ -446,6 +446,7 @@ KERNEL_OBJECTS=" $KERNEL_BUILD_DIR/mutable_fs.o $KERNEL_BUILD_DIR/vfs.o $KERNEL_BUILD_DIR/vfs_mutable.o + $KERNEL_BUILD_DIR/vfs_initramfs.o $KERNEL_BUILD_DIR/vfs_model.o $KERNEL_BUILD_DIR/model_volume_admin.o $KERNEL_BUILD_DIR/service.o @@ -577,6 +578,7 @@ compile_kernel "$ROOT_DIR/kernel/fs/initramfs.c" "$KERNEL_BUILD_DIR/initramfs.o" compile_kernel "$ROOT_DIR/kernel/fs/mutable_fs.c" "$KERNEL_BUILD_DIR/mutable_fs.o" compile_kernel "$ROOT_DIR/kernel/fs/vfs.c" "$KERNEL_BUILD_DIR/vfs.o" compile_kernel "$ROOT_DIR/kernel/fs/vfs_mutable.c" "$KERNEL_BUILD_DIR/vfs_mutable.o" +compile_kernel "$ROOT_DIR/kernel/fs/vfs_initramfs.c" "$KERNEL_BUILD_DIR/vfs_initramfs.o" compile_kernel "$ROOT_DIR/kernel/fs/vfs_model.c" "$KERNEL_BUILD_DIR/vfs_model.o" compile_kernel "$ROOT_DIR/kernel/fs/model_volume_admin.c" "$KERNEL_BUILD_DIR/model_volume_admin.o" compile_kernel "$ROOT_DIR/kernel/user/service.c" "$KERNEL_BUILD_DIR/service.o" diff --git a/userspace/apps/xapt.c b/userspace/apps/xapt.c index 5e3cc034..3a9306ad 100644 --- a/userspace/apps/xapt.c +++ b/userspace/apps/xapt.c @@ -283,7 +283,11 @@ static int http_get(const xapt_config_t *config, const char *catalog_path, u64 cursor = 0U; if (header_complete == 0U) { while (cursor < received && header_complete == 0U) { - if (header_used + 1U >= sizeof(g_buffer)) { + /* Headers accumulate in g_catalog before the body claims it, so the + cap must hold against that buffer, not g_buffer: the old test only + worked because g_buffer happens to be the smaller of the two. */ + if (header_used + 1U >= sizeof(g_buffer) || + header_used + 1U >= sizeof(g_catalog)) { g_http_error = 5U; (void)xaios_net_close(socket); return -1; @@ -377,6 +381,11 @@ static int load_config(xapt_config_t *config) { if (bytes <= 0) bytes = xaios_read_file("/etc/xapt.conf", g_buffer, sizeof(g_buffer)); if (bytes <= 0) return -1; + /* The key matches below compare fixed prefixes against the raw buffer, so + the content must end inside it: a full buffer is either truncated or + leaves a final unterminated line for a prefix compare to walk past. */ + if ((u64)bytes >= sizeof(g_buffer)) return -1; + g_buffer[bytes] = '\0'; u64 cursor = 0U; while (cursor < (u64)bytes) { u64 start = cursor; diff --git a/userspace/apps/xapt_tls.c b/userspace/apps/xapt_tls.c index 363f9764..b0399768 100644 --- a/userspace/apps/xapt_tls.c +++ b/userspace/apps/xapt_tls.c @@ -117,9 +117,15 @@ static int use_pinned_key(const char *rsa_modulus_hex) { int xapt_tls_open(u64 socket, const char *server_name, const char *rsa_modulus_hex) { - static const uint16_t suites[] = { + /* The pinned mode accepts exactly one RSA key, so it must offer only the + RSA suite: a server holding both certificate types honours the client's + order, and offering ECDSA first would steer such a server into a suite + the pin can never satisfy. Chain validation handles either type. */ + static const uint16_t chain_suites[] = { BR_TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, BR_TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256}; + static const uint16_t pinned_suites[] = { + BR_TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256}; int pinned = rsa_modulus_hex != 0 && rsa_modulus_hex[0] != '\0'; unsigned char entropy[32]; g_error = 0; @@ -135,8 +141,13 @@ int xapt_tls_open(u64 socket, const char *server_name, g_deadline = xaios_clock_nanos() + UINT64_C(600000000000); br_ssl_client_zero(&g_client); br_ssl_engine_set_versions(&g_client.eng, BR_TLS12, BR_TLS12); - br_ssl_engine_set_suites(&g_client.eng, suites, - sizeof(suites) / sizeof(suites[0])); + if (pinned) { + br_ssl_engine_set_suites(&g_client.eng, pinned_suites, + sizeof(pinned_suites) / sizeof(pinned_suites[0])); + } else { + br_ssl_engine_set_suites(&g_client.eng, chain_suites, + sizeof(chain_suites) / sizeof(chain_suites[0])); + } br_ssl_client_set_default_rsapub(&g_client); br_ssl_engine_set_default_rsavrfy(&g_client.eng); br_ssl_engine_set_default_ecdsa(&g_client.eng); diff --git a/userspace/sshd/sshd.c b/userspace/sshd/sshd.c index 57167842..b836cecb 100644 --- a/userspace/sshd/sshd.c +++ b/userspace/sshd/sshd.c @@ -474,16 +474,21 @@ static void console_write_ipv6(void) { if (best_length < 2U) best_start = 8U; static const char hex[] = "0123456789abcdef"; + /* The marker carries both of its colons, and the group after it therefore + adds no separator of its own. Splitting the pair across the marker and + the next group breaks whenever there is no next group: a run reaching + the last group would render one colon short. */ + uint32_t marker_end = best_start < 8U ? best_start + best_length : 8U; char line[48]; u64 offset = 0U; xaios_memzero(line, sizeof(line)); for (uint32_t i = 0U; i < 8U;) { if (i == best_start) { - xaios_append_cstr(line, sizeof(line), &offset, i == 0U ? "::" : ":"); + xaios_append_cstr(line, sizeof(line), &offset, "::"); i += best_length; continue; } - if (i != 0U && i != best_start) { + if (i != 0U && i != marker_end) { xaios_append_cstr(line, sizeof(line), &offset, ":"); } uint16_t value = groups[i]; diff --git a/wiki/Applications.md b/wiki/Applications.md index ea1e2666..6226e5ba 100644 --- a/wiki/Applications.md +++ b/wiki/Applications.md @@ -10,6 +10,11 @@ are documented separately in [[Commands|Commands]]. ## Boot and service applications +`/bin` is the boot image mounted read-only into the VFS, so `ls /bin` +lists the shipped executables and `ls -l` reports their sizes. Writes, +renames, and deletions under it are rejected; mutable data belongs under +`/state`, `/apps`, and `/tmp`. + | Path | Purpose | Normal startup | |---|---|---| | `/init` | First userspace process. Establishes the initial service lifecycle and returns status to the kernel. | Started once during boot. | From 47bb3d4bc6f7db032ee4f63d86ee307289c28a36 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Andr=C3=A9=20Borchert?= Date: Sun, 23 Aug 2026 23:48:59 +0700 Subject: [PATCH 15/16] Move the trust-anchor generator out of scripts/ scripts/ holds runtime scripts against an explicit allowlist, and the layout check enforces it. The trust-anchor generator is build-time tooling and belongs in tools/ with the other generators, so docs-check failed the moment it landed, which also failed the aggregate Core OS RC that runs docs-check inside it. Regenerating from the new location reproduces the anchors byte for byte; only the provenance comment changes. Co-Authored-By: Claude Opus 5 --- .../gen_xapt_trust_anchors.py | 4 ++-- userspace/apps/xapt_trust_anchors.c | 2 +- userspace/apps/xapt_trust_anchors.h | 2 +- 3 files changed, 4 insertions(+), 4 deletions(-) rename scripts/gen-xapt-trust-anchors.py => tools/gen_xapt_trust_anchors.py (96%) diff --git a/scripts/gen-xapt-trust-anchors.py b/tools/gen_xapt_trust_anchors.py similarity index 96% rename from scripts/gen-xapt-trust-anchors.py rename to tools/gen_xapt_trust_anchors.py index 662acfd2..682f127a 100644 --- a/scripts/gen-xapt-trust-anchors.py +++ b/tools/gen_xapt_trust_anchors.py @@ -10,7 +10,7 @@ The roots come from a trusted local CA store, never from the server being validated. Regenerate after replacing a PEM in userspace/apps/trust: - python3 scripts/gen-xapt-trust-anchors.py + python3 tools/gen_xapt_trust_anchors.py """ import pathlib @@ -93,7 +93,7 @@ def main(): body = "\n".join(blocks) table = "\n".join(entries) OUTPUT.write_text( - "/* Generated by scripts/gen-xapt-trust-anchors.py. Do not edit. */\n" + "/* Generated by tools/gen_xapt_trust_anchors.py. Do not edit. */\n" '#include "xapt_trust_anchors.h"\n\n' f"{body}\n" "const br_x509_trust_anchor XAPT_TRUST_ANCHORS[] = {\n" diff --git a/userspace/apps/xapt_trust_anchors.c b/userspace/apps/xapt_trust_anchors.c index aa0ad5d7..d62a20c0 100644 --- a/userspace/apps/xapt_trust_anchors.c +++ b/userspace/apps/xapt_trust_anchors.c @@ -1,4 +1,4 @@ -/* Generated by scripts/gen-xapt-trust-anchors.py. Do not edit. */ +/* Generated by tools/gen_xapt_trust_anchors.py. Do not edit. */ #include "xapt_trust_anchors.h" /* CN=ISRG Root X1,O=Internet Security Research Group,C=US (ISRG_Root_X1.pem) */ diff --git a/userspace/apps/xapt_trust_anchors.h b/userspace/apps/xapt_trust_anchors.h index cf4a8817..9c0aa7e2 100644 --- a/userspace/apps/xapt_trust_anchors.h +++ b/userspace/apps/xapt_trust_anchors.h @@ -4,7 +4,7 @@ #include /* Root certificates the updater's chain is validated against, generated from - userspace/apps/trust by scripts/gen-xapt-trust-anchors.py. */ + userspace/apps/trust by tools/gen_xapt_trust_anchors.py. */ extern const br_x509_trust_anchor XAPT_TRUST_ANCHORS[]; extern const size_t XAPT_TRUST_ANCHORS_COUNT; From c02f73de968096cf7a0568526afa9e2ab0e68ff3 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Andr=C3=A9=20Borchert?= Date: Mon, 24 Aug 2026 00:46:38 +0700 Subject: [PATCH 16/16] Resolve insecure delegations, and survive a torn metadata write Three areas, all reachable from the same complaint: a system that fails without saying why, or fails in a way it cannot come back from. DNSSEC has three outcomes and the resolver implemented two. An unsigned delegation was refused as bogus, because proving an absent DS under the opt-out NSEC3 its parent serves was not implemented and the stage machine had no insecure state to move into: even a successful proof led to a stage that demanded an RRSIG the zone would never have. NSEC3 denial now exists, including opt-out, with iteration counts above 150 refused rather than computed, and a proven-insecure zone accepts its unsigned answer. Those answers are counted apart from authenticated ones, which carry a stronger guarantee and should not be reported as the same thing. Verified against the live origin: the updater hostname resolves through root, io, and an insecure nip.io, and fetches its signed catalog. A boot panic printed registers and a backtrace but never said what failed. The reason was logged, and then erased: a normal boot redraws the progress display over the serial console moments before the panic replaces it. Worse, the log ring only started once MutableFS was mounted, because capture and persistence were the same switch, so an early panic had nothing to replay even in principle. Capture now begins at the top of boot and depends on nothing; persistence is enabled separately once storage exists; and the panic screen replays the tail through a lock-free read, since taking a lock there could hang instead of printing. Boot-image reads also retry now rather than ending the boot on one transient sector error, which is safe because every file is hash-checked and a retry that was needed is logged. MutableFS rewrote its metadata in place, so a write interrupted by power loss left the region neither valid nor blank. Mount then refused to continue, correctly, because formatting would have destroyed the volume; the result was a filesystem that could be neither mounted nor repaired. It now keeps two copies and alternates writes, so a tear only ever damages the copy that is not authoritative. The mirror sits past the data region and the write sequence in the slack at the end, so no existing offset moves and volumes written before this keep mounting; a volume with no room stays single-copy. Alternating rather than writing both keeps the write cost unchanged. With both copies damaged the mount still refuses, because falling back is a recovery and not a licence to discard data. The host test that covers this damaged each copy the way a torn write does and caught a real defect: the first implementation probed the mirror only when the volume reported v5, but a torn primary has no readable version, so the fallback was skipped in exactly the case it exists for. Also stop refusing SSH startup when the host key cannot be persisted. The key in hand is good; only its durability is in question, and an unwritable filesystem is precisely when an operator needs to get in and repair storage. The service keeps the key and reports it as ephemeral, which clients surface as a changed key, where an unreachable machine offers nothing to act on. Verified: hosted tests including the new recovery cases, compile-check, docs-check, the local console and xapt gates, the network suite, persistence across reboot, and the storage crash test, which reports all metadata kill points recovered. Co-Authored-By: Claude Opus 5 --- Makefile | 5 + docs/NETWORK-SSH-STATUS.md | 6 +- kernel/core/klog_ring.c | 57 ++++++-- kernel/core/kmain.c | 11 +- kernel/core/panic.c | 37 ++++++ kernel/fs/initramfs.c | 33 ++++- kernel/fs/mutable_fs.c | 170 +++++++++++++++++++++++- kernel/include/xaios/dns.h | 3 + kernel/include/xaios/dnssec.h | 17 +++ kernel/include/xaios/klog_ring.h | 8 ++ kernel/include/xaios/mutable_fs.h | 4 + kernel/net/dns.c | 32 ++++- kernel/net/dnssec.c | 174 +++++++++++++++++++++++++ tests/storage/test_mutable_fs_mirror.c | 150 +++++++++++++++++++++ userspace/sshd/ssh_host_key.c | 28 +++- userspace/sshd/ssh_host_key.h | 3 + wiki/Boot-and-Console.md | 13 ++ wiki/Current-Limitations.md | 27 ++-- 18 files changed, 737 insertions(+), 41 deletions(-) create mode 100644 tests/storage/test_mutable_fs_mirror.c diff --git a/Makefile b/Makefile index 55b8d957..84630119 100644 --- a/Makefile +++ b/Makefile @@ -421,6 +421,11 @@ hosted-test: engine-cli -Ikernel/include kernel/fs/vfs.c tests/storage/test_vfs.c \ -o build/hosted/test-vfs ./build/hosted/test-vfs + $(HOST_CC) $(HOST_CFLAGS) \ + -Ikernel/include kernel/fs/mutable_fs.c kernel/dev/block_device.c \ + tests/storage/test_mutable_fs_mirror.c \ + -o build/hosted/test-mutable-fs-mirror + ./build/hosted/test-mutable-fs-mirror $(HOST_CC) $(HOST_CFLAGS) \ -Iuserspace/include -Iuserspace/sshd -Iuserspace/apps/terminal \ -Ikernel/include \ diff --git a/docs/NETWORK-SSH-STATUS.md b/docs/NETWORK-SSH-STATUS.md index ad33b03e..834ffce4 100644 --- a/docs/NETWORK-SSH-STATUS.md +++ b/docs/NETWORK-SSH-STATUS.md @@ -183,7 +183,11 @@ analysis and physical deployment qualification remain required. Fresh randomness comes from a VirtIO RNG-backed ChaCha20 DRBG. SSH startup is fail-closed when secure entropy is unavailable. The host key is created once, stored on the persistent mutable filesystem, flushed to the block device, and -reused on reboot. Rekey works in both protocol directions; the Debian gate +reused on reboot. If it cannot be written, the service keeps the key it has +and reports that the key is ephemeral rather than refusing to start: an +unwritable filesystem is exactly when an operator needs remote access to +repair storage, and a key that clients report as changed is at least visible, +where an unreachable machine offers nothing to act on. Rekey works in both protocol directions; the Debian gate forces the client-initiated path. The SSH command boundary recognizes an exact `xaiosctl` prefix and invokes the diff --git a/kernel/core/klog_ring.c b/kernel/core/klog_ring.c index 4bef46d8..72d8fb1a 100644 --- a/kernel/core/klog_ring.c +++ b/kernel/core/klog_ring.c @@ -20,6 +20,11 @@ typedef struct xaios_klog_ring { static xaios_klog_ring_t g_ring; static uint32_t g_ring_initialized; +/* Capturing to memory and being able to persist are separate capabilities. + Conflating them meant the ring stayed switched off until MutableFS was + mounted, so nothing from early boot was ever captured and a boot whose + persistent mount failed captured nothing at all. */ +static uint32_t g_persist_ready; static uint64_t g_persist_count; static uint64_t g_rotate_count; @@ -35,17 +40,27 @@ void klog_ring_init(void) { g_ring.total_written = 0; g_persist_count = 0; g_rotate_count = 0; + g_persist_ready = 0; - /* Ensure the persistent log path exists before enabling the ring. */ + /* In-memory capture depends on nothing but this buffer, so it starts here + and can be started long before storage exists. */ + g_ring_initialized = 1; + klog("klog_ring: capture enabled size=%u\n", XAIOS_KLOG_RING_SIZE); +} + +/* Enable the persistent path once MutableFS is mounted. Capture continues + regardless; only flushing depends on this. */ +xaios_status_t klog_ring_enable_persistence(void) { + if (g_ring_initialized == 0) return XAIOS_ERR_INVALID; if (mutable_fs_mkdir("/var") != XAIOS_OK || mutable_fs_mkdir("/var/log") != XAIOS_OK) { - g_ring_initialized = 0; - klog("klog_ring: initialization failed; persistent path unavailable\n"); - return; + g_persist_ready = 0; + klog("klog_ring: persistent path unavailable; capture continues\n"); + return XAIOS_ERR_IO; } - - g_ring_initialized = 1; - klog("klog_ring: initialized size=%u\n", XAIOS_KLOG_RING_SIZE); + g_persist_ready = 1; + klog("klog_ring: persistence enabled\n"); + return XAIOS_OK; } void klog_ring_write(const char *data, uint32_t length) { @@ -114,6 +129,30 @@ uint32_t klog_ring_snapshot(char *out, uint32_t max_len, return copied; } +/* Lock-free tail read for the panic path. + + Every other reader takes the ring lock, which a panic must not: interrupts + are already masked and another CPU may hold it, so waiting would replace a + readable diagnostic with a hang. Reading unlocked can tear against a + concurrent writer; a possibly-frayed last line beats no log at all, which + is what the panic screen showed before. */ +uint32_t klog_ring_panic_tail(char *out, uint32_t max_len) { + uint32_t available; + uint32_t take; + uint32_t start; + if (g_ring_initialized == 0 || out == 0 || max_len == 0) return 0; + available = g_ring.count; + if (available > XAIOS_KLOG_RING_SIZE) available = XAIOS_KLOG_RING_SIZE; + take = available < max_len ? available : max_len; + if (take == 0U) return 0; + start = (g_ring.write_pos + XAIOS_KLOG_RING_SIZE - take) % + XAIOS_KLOG_RING_SIZE; + for (uint32_t i = 0U; i < take; ++i) { + out[i] = g_ring.buffer[(start + i) % XAIOS_KLOG_RING_SIZE]; + } + return take; +} + void klog_ring_clear(void) { if (g_ring_initialized == 0) { return; @@ -156,7 +195,7 @@ uint64_t klog_ring_total_written(void) { } xaios_status_t klog_rotate(void) { - if (g_ring_initialized == 0) { + if (g_ring_initialized == 0 || g_persist_ready == 0) { return XAIOS_ERR_INVALID; } @@ -176,7 +215,7 @@ xaios_status_t klog_rotate(void) { xaios_status_t klog_flush(void) { uint64_t append_offset = 0; - if (g_ring_initialized == 0 || g_ring.count == 0) { + if (g_ring_initialized == 0 || g_persist_ready == 0 || g_ring.count == 0) { return XAIOS_OK; } diff --git a/kernel/core/kmain.c b/kernel/core/kmain.c index ee8e7cf5..16380735 100644 --- a/kernel/core/kmain.c +++ b/kernel/core/kmain.c @@ -203,6 +203,12 @@ static void map_mmio_range(uint64_t start, uint64_t size) { void kmain(const xaios_boot_info_t *boot) { uint32_t persistent_network_ready = 0U; klog_init(boot); + /* Start capturing before any subsystem can fail. A normal boot redraws the + progress display over the serial console, so a failure explanation is + cleared from the screen moments before a panic replaces it; the ring is + what lets the panic screen say why, not just where. */ + klog_ring_init(); + klog_ring_self_test(); boot_ui_begin(boot); boot_ui_self_test(); boot_ui_update(25U, "hardware handoff", "CPU and interrupts", 5U); @@ -441,9 +447,8 @@ void kmain(const xaios_boot_info_t *boot) { provision_ephemeral_credential("/etc/xaios_ssh_client_identity"); admin_control_init(); admin_control_self_test(); - /* Initialize persistent log ring buffer */ - klog_ring_init(); - klog_ring_self_test(); + /* Capture already runs; this only adds the persistent flush path. */ + (void)klog_ring_enable_persistence(); /* Increment boot counter for recovery detection */ boot_counter_increment(); if (boot_in_recovery_mode()) { diff --git a/kernel/core/panic.c b/kernel/core/panic.c index cd5abaa3..392ec48e 100644 --- a/kernel/core/panic.c +++ b/kernel/core/panic.c @@ -1,5 +1,6 @@ #include #include +#include #include #include #include @@ -349,6 +350,41 @@ static void render_backtrace(const uint64_t *trace, uint32_t depth) { panic_puts("\r\n"); } +/* The last thing the kernel said before it died. + + Subsystems log why they fail, but a normal boot redraws the progress + display over the serial console, so on a non-verbose boot that explanation + is cleared off the screen a moment before the panic replaces it. Registers + and a backtrace then describe where the assertion fired without ever + saying what it found. Replaying the ring here keeps the reason attached to + the failure, which is what makes a rare boot panic diagnosable at all. */ +#define XAIOS_PANIC_LOG_BYTES 1536U + +static void render_recent_log(void) { + static char tail[XAIOS_PANIC_LOG_BYTES]; + uint32_t used = klog_ring_panic_tail(tail, sizeof(tail)); + uint32_t start = 0U; + if (used == 0U) return; + panic_puts("\r\n --- Recent Kernel Log ---\r\n"); + /* The first line is usually cut mid-way by the tail boundary; drop it so + the replay starts on a real line. */ + while (start < used && tail[start] != '\n') ++start; + if (start < used) ++start; + if (start >= used) start = 0U; + panic_puts(" "); + for (uint32_t i = start; i < used; ++i) { + char c = tail[i]; + if (c == '\n') { + panic_puts("\r\n "); + } else if (c == '\r') { + continue; + } else if (c >= 0x20 && c < 0x7f) { + panic_putc(c); + } + } + panic_puts("\r\n"); +} + static void render_halt(void) { panic_puts(" System halted. Manual reset required.\r\n"); panic_puts(" =====================================================\r\n"); @@ -394,6 +430,7 @@ void panic_at(const char *file, int line, const char *fmt, ...) { render_gp_regs(gp_regs); render_sys_regs(elr, esr, far, spsr, sp_el0, current_el); render_backtrace(stack_trace, trace_depth); + render_recent_log(); render_halt(); /* Halt forever — no auto-reboot so the operator can read diagnostics */ diff --git a/kernel/fs/initramfs.c b/kernel/fs/initramfs.c index ee9f7030..fdca91db 100644 --- a/kernel/fs/initramfs.c +++ b/kernel/fs/initramfs.c @@ -259,6 +259,31 @@ static xaios_status_t validate_descriptor_target(void) { return XAIOS_ERR_NOT_FOUND; } +/* Bounded retry for boot-time block reads. + + A single transient sector read used to end the boot in a panic, with no + second attempt anywhere on the path. Retrying cannot smuggle in corruption: + the header is structurally validated and every file is checked against its + recorded hash below, so a bad read still fails. A retry that was actually + needed is logged, so a marginal device stays visible rather than silently + absorbed. */ +#define INITFS_READ_ATTEMPTS 3U + +static xaios_status_t read_sector_retrying(uint64_t sector, void *buffer) { + for (uint32_t attempt = 0U; attempt < INITFS_READ_ATTEMPTS; ++attempt) { + if (virtio_block_read_sector(sector, buffer, SECTOR_SIZE) == XAIOS_OK) { + if (attempt != 0U) { + klog("initramfs: sector=%lu read recovered on attempt %u\n", sector, + (unsigned)(attempt + 1U)); + } + return XAIOS_OK; + } + } + klog("initramfs: sector=%lu unreadable after %u attempts\n", sector, + (unsigned)INITFS_READ_ATTEMPTS); + return XAIOS_ERR_IO; +} + static xaios_status_t read_file_bytes(uint64_t offset, uint64_t size, void *buffer) { uint8_t sector[SECTOR_SIZE]; @@ -273,8 +298,7 @@ static xaios_status_t read_file_bytes(uint64_t offset, uint64_t size, if (chunk > size - copied) { chunk = size - copied; } - if (virtio_block_read_sector(sector_index, sector, sizeof(sector)) != - XAIOS_OK) { + if (read_sector_retrying(sector_index, sector) != XAIOS_OK) { return XAIOS_ERR_IO; } bytes_copy(out + copied, sector + sector_offset, chunk); @@ -325,9 +349,8 @@ static xaios_status_t validate_entry(const initfs_disk_header_t *header, xaios_status_t initramfs_init(void) { uint8_t header_bytes[INITFS_HEADER_BYTES]; for (uint64_t i = 0; i < INITFS_HEADER_BYTES / SECTOR_SIZE; ++i) { - if (virtio_block_read_sector(INITFS_SECTOR + i, - header_bytes + (i * SECTOR_SIZE), - SECTOR_SIZE) != XAIOS_OK) { + if (read_sector_retrying(INITFS_SECTOR + i, + header_bytes + (i * SECTOR_SIZE)) != XAIOS_OK) { klog("initramfs: failed to read header sector=%lu\n", INITFS_SECTOR + i); return XAIOS_ERR_IO; diff --git a/kernel/fs/mutable_fs.c b/kernel/fs/mutable_fs.c index 727e9ec3..96e4cfd3 100644 --- a/kernel/fs/mutable_fs.c +++ b/kernel/fs/mutable_fs.c @@ -13,6 +13,27 @@ #define MFS_SECTOR_SIZE UINT64_C(512) #define MFS_START_SECTOR UINT64_C(3072) #define MFS_METADATA_SECTORS UINT64_C(16) +/* A/B metadata. + + The metadata region is written in place, so a write torn by power loss + leaves it neither valid nor blank. Mount then refuses to continue, because + formatting would destroy the volume, and the result is a filesystem that + cannot be mounted or repaired. A second copy removes that: writes alternate + between the two, so a tear can only ever damage the copy that is not + currently authoritative, and mount falls back to the survivor. + + The mirror lives past the data region, so every existing offset is + unchanged and an existing volume keeps mounting. The write sequence sits in + the slack at the end of the region for the same reason: appending a header + field would have shifted the bitmap and every node after it. A volume + written before this reads sequence 0, which simply makes it the older copy. + + Alternating rather than writing both copies each time keeps the write cost + identical to before. The trade is that a torn write falls back to the + previous commit instead of the one being written, which is the same + guarantee an interrupted commit already had. */ +#define MFS_METADATA_SLOTS 2U +#define MFS_SEQUENCE_TAIL_BYTES UINT64_C(16) #define MFS_JOURNAL_SECTORS UINT64_C(2) #define MFS_CHECKSUM_OFFSET UINT64_C(80) #define MFS_DATA_SECTORS 96U @@ -201,6 +222,11 @@ static uint64_t g_open_count; static uint64_t g_close_count; static uint64_t g_metadata_verified_checksum; +/* Slot the live metadata was loaded from; the next write targets the other. */ +static uint32_t g_metadata_slot; +static uint32_t g_metadata_mirror_enabled; +static uint64_t g_metadata_sequence; +static uint64_t g_metadata_mirror_recoveries; static uint8_t g_metadata_buffer[MFS_V5_METADATA_SECTORS * MFS_SECTOR_SIZE]; static xaios_spinlock_t g_mutable_fs_lock = XAIOS_SPINLOCK_INIT; @@ -297,6 +323,21 @@ static uint64_t active_data_start_sector(void) { return active_journal_header_sector() + MFS_JOURNAL_SECTORS; } +/* The mirror sits immediately after the data region, so nothing that an + existing volume already uses moves. */ +static uint64_t metadata_mirror_start_sector(void) { + return active_data_start_sector() + g_active_data_sectors; +} + +static uint64_t metadata_slot_start_sector(uint32_t slot) { + return slot == 0U ? MFS_START_SECTOR : metadata_mirror_start_sector(); +} + +static uint64_t metadata_sequence_offset(void) { + return (uint64_t)g_active_metadata_sectors * MFS_SECTOR_SIZE - + MFS_SEQUENCE_TAIL_BYTES; +} + static xaios_status_t blk_read(uint64_t sector, void *buf, uint64_t sz) { if (g_persistent_device != 0) { if (sector > UINT64_MAX / MFS_SECTOR_SIZE) return XAIOS_ERR_INVALID; @@ -663,9 +704,10 @@ static void export_legacy_node(xaios_mfs_node_v3_t *legacy, } } -static xaios_status_t read_metadata(void) { +static xaios_status_t read_metadata_slot(uint32_t slot) { uint8_t first_sector[MFS_SECTOR_SIZE]; - if (blk_read(MFS_START_SECTOR, first_sector, sizeof(first_sector)) != XAIOS_OK) { + uint64_t start = metadata_slot_start_sector(slot); + if (blk_read(start, first_sector, sizeof(first_sector)) != XAIOS_OK) { return XAIOS_ERR_IO; } uint32_t version = 0; @@ -683,12 +725,14 @@ static xaios_status_t read_metadata(void) { bytes_zero(g_metadata_buffer, sizeof(g_metadata_buffer)); bytes_copy(g_metadata_buffer, first_sector, MFS_SECTOR_SIZE); for (uint32_t i = 1; i < sectors; ++i) { - if (blk_read(MFS_START_SECTOR + i, + if (blk_read(start + i, g_metadata_buffer + i * MFS_SECTOR_SIZE, MFS_SECTOR_SIZE) != XAIOS_OK) { return XAIOS_ERR_IO; } } + bytes_copy(&g_metadata_sequence, + g_metadata_buffer + metadata_sequence_offset(), 8); uint64_t total_bytes = (uint64_t)sectors * MFS_SECTOR_SIZE; g_metadata_verified_checksum = mfs_checksum(g_metadata_buffer, total_bytes); bytes_zero(&g_mfs, sizeof(g_mfs)); @@ -736,6 +780,54 @@ static xaios_status_t read_metadata(void) { return XAIOS_OK; } +/* A slot is usable when it parses and its stored checksum matches what its + own bytes hash to. Structural validation stays with the caller, which + applies it to whichever slot wins. */ +static int metadata_slot_probe(uint32_t slot, uint64_t *out_sequence) { + if (read_metadata_slot(slot) != XAIOS_OK) return 0; + if (g_mfs.checksum != g_metadata_verified_checksum) return 0; + if (!bytes_eq(g_mfs.magic, MFS_MAGIC, MFS_MAGIC_LEN)) return 0; + *out_sequence = g_metadata_sequence; + return 1; +} + +/* Load the newer of the two copies that is intact. */ +static xaios_status_t read_metadata(void) { + uint64_t sequence[MFS_METADATA_SLOTS] = {0U, 0U}; + int usable[MFS_METADATA_SLOTS] = {0, 0}; + uint32_t chosen; + usable[0] = metadata_slot_probe(0U, &sequence[0]); + if (g_metadata_mirror_enabled != 0U) { + /* The mirror's position depends on the geometry, which normally comes + from the primary. A torn primary is exactly the case this exists for, + and its version field is unreadable then, so assume the only layout + that ever has a mirror rather than giving up on the copy that is + still intact. */ + if (usable[0] == 0) set_active_v5(); + if (g_active_version == MFS_V5_VERSION) { + usable[1] = metadata_slot_probe(1U, &sequence[1]); + } + } + if (usable[0] == 0 && usable[1] == 0) { + /* Neither copy is intact. Reload the primary so the caller sees the + original bytes and can apply its own blank-versus-damaged judgement. */ + g_metadata_slot = 0U; + return read_metadata_slot(0U); + } + if (usable[0] != 0 && usable[1] != 0) { + chosen = sequence[1] > sequence[0] ? 1U : 0U; + } else { + chosen = usable[0] != 0 ? 0U : 1U; + } + if (usable[chosen ^ 1U] == 0) { + ++g_metadata_mirror_recoveries; + klog("mutable-fs: metadata slot %u unusable; continuing from slot %u seq=%lu\n", + (unsigned)(chosen ^ 1U), (unsigned)chosen, sequence[chosen]); + } + g_metadata_slot = chosen; + return read_metadata_slot(chosen); +} + static xaios_status_t write_metadata(void) { bytes_zero(g_metadata_buffer, sizeof(g_metadata_buffer)); uint64_t p = 0; @@ -783,20 +875,36 @@ static xaios_status_t write_metadata(void) { ++g_reject_count; return XAIOS_ERR_NO_MEMORY; } + /* Stamp the write sequence before hashing so the checksum covers it; a + tear that damages the sequence therefore invalidates the copy too. */ + uint64_t next_sequence = g_metadata_sequence + 1U; + bytes_copy(g_metadata_buffer + metadata_sequence_offset(), &next_sequence, 8); g_mfs.checksum = mfs_checksum(g_metadata_buffer, total_bytes); bytes_copy(g_metadata_buffer + checksum_offset, &g_mfs.checksum, 8); + /* Alternate slots so the copy being overwritten is never the one mount + would currently choose. Without a mirror this degrades to the previous + in-place behaviour. */ + uint32_t target = g_metadata_mirror_enabled != 0U ? (g_metadata_slot ^ 1U) + : g_metadata_slot; + uint64_t start = metadata_slot_start_sector(target); uint8_t sector[MFS_SECTOR_SIZE]; for (uint32_t i = 0; i < g_active_metadata_sectors; ++i) { bytes_copy(sector, g_metadata_buffer + (uint64_t)i * MFS_SECTOR_SIZE, MFS_SECTOR_SIZE); - if (blk_write(MFS_START_SECTOR + i, sector, sizeof(sector)) != XAIOS_OK) { + if (blk_write(start + i, sector, sizeof(sector)) != XAIOS_OK) { klog("mutable-fs: metadata write failed sector=%lu capacity=%lu\n", - MFS_START_SECTOR + i, blk_capacity()); + start + i, blk_capacity()); ++g_reject_count; return XAIOS_ERR_IO; } } - return blk_flush(); + xaios_status_t flushed = blk_flush(); + if (flushed != XAIOS_OK) return flushed; + /* Only once the new copy is durable does it become the one to read, and + the other becomes the next target. */ + g_metadata_slot = target; + g_metadata_sequence = next_sequence; + return XAIOS_OK; } static xaios_status_t clear_journal(void) { @@ -932,9 +1040,17 @@ static xaios_status_t format_volume(void) { g_mfs.generation = 1; g_mfs.committed_generation = 0; ++g_format_count; + g_metadata_sequence = 0U; + g_metadata_slot = 0U; if (clear_journal() != XAIOS_OK) { return XAIOS_ERR_IO; } + /* Fill both copies at format time. Writing only one would leave a fresh + volume with a single valid copy until its second metadata write, which + is exactly the window this is meant to remove. The two writes alternate + slots, so both end up holding a complete, self-consistent image. */ + if (write_metadata() != XAIOS_OK) return XAIOS_ERR_IO; + if (g_metadata_mirror_enabled == 0U) return XAIOS_OK; return write_metadata(); } @@ -1030,6 +1146,12 @@ static xaios_status_t replay_journal(void) { static xaios_status_t mount_volume(uint32_t mount_flags) { set_active_v2(); + /* The in-image volume is sized to the boot image and has no room for a + mirror. Clear it explicitly: this global outlives a previous device + mount, and inheriting its setting here would send writes to a slot that + does not exist on this volume. */ + g_metadata_mirror_enabled = 0U; + g_metadata_slot = 0U; if (blk_capacity() < active_data_start_sector() + g_active_data_sectors) { ++g_reject_count; return XAIOS_ERR_IO; @@ -2070,6 +2192,10 @@ static xaios_status_t mutable_fs_close_locked(uint32_t fd) { } uint64_t mutable_fs_mount_count(void) { return g_mount_count; } +uint64_t mutable_fs_metadata_recoveries(void) { + return g_metadata_mirror_recoveries; +} + uint64_t mutable_fs_format_count(void) { return g_format_count; } uint64_t mutable_fs_boot_load_count(void) { return g_boot_load_count; } uint64_t mutable_fs_file_count(void) { return node_count_by_type(MFS_NODE_FILE); } @@ -2129,6 +2255,15 @@ static xaios_status_t mutable_fs_mount_device_locked(const char *identifier) { return XAIOS_ERR_UNSUPPORTED; } set_active_v5(); + g_metadata_slot = 0U; + g_metadata_sequence = 0U; + /* The mirror is optional: a volume sized exactly for the old layout keeps + working single-copy rather than being refused. */ + g_metadata_mirror_enabled = + info.capacity_bytes / MFS_SECTOR_SIZE >= + metadata_mirror_start_sector() + g_active_metadata_sectors + ? 1U + : 0U; if (info.capacity_bytes / MFS_SECTOR_SIZE < active_data_start_sector() + MFS_V5_DATA_SECTORS) { klog("mutable-fs: persistent disk too small capacity=%lu needed=%lu\n", @@ -2416,6 +2551,29 @@ xaios_status_t mutable_fs_mount_device(const char *identifier) { return result; } +/* Release a mounted device, flushing first. The slot bookkeeping is reset so + a later mount re-derives which copy is authoritative from the volume rather + than from whatever the previous mount happened to leave behind. */ +xaios_status_t mutable_fs_unmount(void) { + xaios_spin_lock(&g_mutable_fs_lock); + if (g_persistent_device == 0) { + xaios_spin_unlock(&g_mutable_fs_lock); + return XAIOS_ERR_INVALID; + } + (void)blk_flush(); + xaios_block_device_t *device = g_persistent_device; + g_persistent_device = 0; + g_mounted = 0; + g_mount_flags = 0; + g_metadata_slot = 0U; + g_metadata_sequence = 0U; + g_metadata_mirror_enabled = 0U; + set_active_v2(); + (void)block_device_close(device); + xaios_spin_unlock(&g_mutable_fs_lock); + return XAIOS_OK; +} + xaios_status_t mutable_fs_mount_persistent(uint32_t slot) { xaios_spin_lock(&g_mutable_fs_lock); xaios_status_t result = mutable_fs_mount_persistent_locked(slot); diff --git a/kernel/include/xaios/dns.h b/kernel/include/xaios/dns.h index 078339e0..91e92fa2 100644 --- a/kernel/include/xaios/dns.h +++ b/kernel/include/xaios/dns.h @@ -56,6 +56,9 @@ uint64_t dns_reject_count(void); uint64_t dns_timeout_count(void); uint64_t dns_tcp_fallback_count(void); uint64_t dns_authenticated_count(void); +/* Answers accepted from a proven-insecure zone. Deliberately not folded into + the authenticated count: the two carry different guarantees. */ +uint64_t dns_insecure_count(void); uint32_t dns_pending_count(void); /* Encode a DNS name (e.g., "www.google.com" -> 3www6google3com0) */ diff --git a/kernel/include/xaios/dnssec.h b/kernel/include/xaios/dnssec.h index 23cf84c5..2312637d 100644 --- a/kernel/include/xaios/dnssec.h +++ b/kernel/include/xaios/dnssec.h @@ -73,4 +73,21 @@ xaios_status_t dnssec_verify_nodata(const uint8_t *message, uint32_t length, const dnssec_keyset_t *keys, uint64_t wall_time_ns); +/* Prove a delegation carries no DS, which makes the child zone insecure + * rather than bogus. Accepts a signed NSEC3 matching the delegation with NS + * and without DS, or a signed opt-out NSEC3 whose hash range covers it. */ +xaios_status_t dnssec_verify_no_ds(const uint8_t *message, uint32_t length, + const char *child_zone, + const dnssec_keyset_t *keys, + uint64_t wall_time_ns); + +/* Read an address from an unsigned answer. Valid only after the chain has + * proven the zone insecure; owner and type are still matched. */ +xaios_status_t dnssec_extract_address_insecure(const uint8_t *message, + uint32_t length, + const char *hostname, + uint16_t type, + uint8_t *out_address, + uint32_t *out_ttl); + #endif diff --git a/kernel/include/xaios/klog_ring.h b/kernel/include/xaios/klog_ring.h index 60cef5a8..bcbfeebf 100644 --- a/kernel/include/xaios/klog_ring.h +++ b/kernel/include/xaios/klog_ring.h @@ -16,12 +16,20 @@ typedef enum xaios_log_level { #define XAIOS_KLOG_LINE_MAX UINT32_C(256) #define XAIOS_KLOG_FLUSH_MAX UINT32_C(8192) +/* Start in-memory capture. Safe to call as soon as klog works; depends on + no other subsystem. */ void klog_ring_init(void); +/* Enable the persistent flush path once MutableFS is mounted. Capture is + unaffected by this failing. */ +xaios_status_t klog_ring_enable_persistence(void); void klog_ring_write(const char *data, uint32_t length); uint32_t klog_ring_read(char *out, uint32_t max_len); uint32_t klog_ring_snapshot(char *out, uint32_t max_len, uint64_t since_cursor, uint64_t *start_cursor, uint64_t *next_cursor, uint64_t *latest_cursor); +/* Lock-free tail read, for the panic path only. May tear against a + concurrent writer; every other reader should use klog_ring_snapshot. */ +uint32_t klog_ring_panic_tail(char *out, uint32_t max_len); void klog_ring_clear(void); uint32_t klog_ring_count(void); uint32_t klog_ring_overflow_count(void); diff --git a/kernel/include/xaios/mutable_fs.h b/kernel/include/xaios/mutable_fs.h index d4815535..ebf6f964 100644 --- a/kernel/include/xaios/mutable_fs.h +++ b/kernel/include/xaios/mutable_fs.h @@ -34,6 +34,10 @@ typedef struct xaios_mfs_fsck_result { void mutable_fs_self_test(void); xaios_status_t mutable_fs_mount_device(const char *identifier); +/* Flush and release the mounted device. */ +xaios_status_t mutable_fs_unmount(void); +/* Metadata copies recovered from during mount, when one was unusable. */ +uint64_t mutable_fs_metadata_recoveries(void); xaios_status_t mutable_fs_mount_persistent(uint32_t slot); xaios_mfs_fsck_result_t mutable_fs_fsck(void); uint64_t mutable_fs_persistent_mount_count(void); diff --git a/kernel/net/dns.c b/kernel/net/dns.c index de011b73..96f63561 100644 --- a/kernel/net/dns.c +++ b/kernel/net/dns.c @@ -55,6 +55,10 @@ typedef struct dns_pending { uint8_t family; uint8_t retransmits; uint8_t dnssec_stage; + /* DNSSEC has three outcomes. Set once a delegation is proven to carry no + DS: everything below it is unsigned, so the address answer arrives with + no RRSIG and must be accepted on the strength of that proof instead. */ + uint8_t dnssec_insecure; uint8_t zone_labels; uint8_t hostname_labels; uint16_t id; @@ -88,6 +92,7 @@ static uint64_t g_reject_count; static uint64_t g_timeout_count; static uint64_t g_tcp_fallback_count; static uint64_t g_authenticated_count; +static uint64_t g_insecure_count; static void complete_pending(xaios_status_t status) { g_pending.state = DNS_PENDING_COMPLETE; @@ -177,6 +182,7 @@ void dns_init(void) { g_timeout_count = 0U; g_tcp_fallback_count = 0U; g_authenticated_count = 0U; + g_insecure_count = 0U; dnssec_init(); } @@ -533,7 +539,14 @@ xaios_status_t dns_process_message(const uint8_t *message, uint32_t length, g_pending.dnssec_stage = DNSSEC_STAGE_CHILD_DNSKEY; } else if (dnssec_verify_nodata(message, length, g_pending.child_zone, DNS_TYPE_DS, &g_pending.validated_keys, - wall_ns) == XAIOS_OK) { + wall_ns) == XAIOS_OK || + dnssec_verify_no_ds(message, length, g_pending.child_zone, + &g_pending.validated_keys, + wall_ns) == XAIOS_OK) { + /* No DS at this delegation: the child is insecure, not bogus. Ask for + the address directly rather than walking further down a chain that + has no keys to offer. */ + g_pending.dnssec_insecure = 1U; status = start_query(&g_pending, g_pending.hostname, g_pending.family == XAIOS_IP_FAMILY_V4 ? XAIOS_DNS_TYPE_A : XAIOS_DNS_TYPE_AAAA, now_ns); g_pending.dnssec_stage = DNSSEC_STAGE_ADDRESS; @@ -560,13 +573,23 @@ xaios_status_t dns_process_message(const uint8_t *message, uint32_t length, } else if (g_pending.dnssec_stage == DNSSEC_STAGE_ADDRESS) { uint8_t bytes[16]; uint32_t ttl = 0U; uint16_t type = g_pending.family == XAIOS_IP_FAMILY_V4 ? XAIOS_DNS_TYPE_A : XAIOS_DNS_TYPE_AAAA; - status = dnssec_verify_address(message, length, g_pending.hostname, type, - &g_pending.validated_keys, wall_ns, bytes, &ttl); + status = g_pending.dnssec_insecure != 0U + ? dnssec_extract_address_insecure(message, length, + g_pending.hostname, type, + bytes, &ttl) + : dnssec_verify_address(message, length, g_pending.hostname, + type, &g_pending.validated_keys, + wall_ns, bytes, &ttl); if (status == XAIOS_OK) { xaios_ip_addr_t answer; xaios_ip_addr_zero(&answer); answer.family = g_pending.family; bytes_copy(answer.addr, bytes, g_pending.family == XAIOS_IP_FAMILY_V4 ? 4U : 16U); cache_insert(g_pending.hostname, &answer, ttl, now_ns); - ++g_authenticated_count; ++g_response_count; + /* Only a validated chain counts as authenticated. An insecure answer + is a separate, weaker result and is counted separately so the two + can never be read as the same thing. */ + if (g_pending.dnssec_insecure != 0U) ++g_insecure_count; + else ++g_authenticated_count; + ++g_response_count; if (g_pending.tcp_flow_id != 0U) (void)network_stack_tcp_close_flow(g_pending.tcp_flow_id); bytes_zero(&g_pending, sizeof(g_pending)); return XAIOS_OK; } @@ -689,6 +712,7 @@ uint64_t dns_reject_count(void) { return g_reject_count; } uint64_t dns_timeout_count(void) { return g_timeout_count; } uint64_t dns_tcp_fallback_count(void) { return g_tcp_fallback_count; } uint64_t dns_authenticated_count(void) { return g_authenticated_count; } +uint64_t dns_insecure_count(void) { return g_insecure_count; } uint32_t dns_pending_count(void) { return g_pending.state != DNS_PENDING_NONE && g_pending.state != DNS_PENDING_COMPLETE diff --git a/kernel/net/dnssec.c b/kernel/net/dnssec.c index 6f5a55b0..842657ea 100644 --- a/kernel/net/dnssec.c +++ b/kernel/net/dnssec.c @@ -9,6 +9,13 @@ #define DNSSEC_TYPE_DNSKEY 48U #define DNSSEC_TYPE_RRSIG 46U #define DNSSEC_TYPE_NSEC 47U +#define DNSSEC_TYPE_NSEC3 50U +#define DNSSEC_NSEC3_SHA1 1U +#define DNSSEC_NSEC3_OPT_OUT 0x01U +/* An iteration count is attacker-chosen work for the resolver. RFC 9276 puts + the sensible ceiling at zero; accept a small margin for zones that have not + caught up, and refuse the rest rather than burn boot time on them. */ +#define DNSSEC_NSEC3_MAX_ITERATIONS 150U #define DNSSEC_MIN_WALL_TIME UINT64_C(946684800000000000) #define DNSSEC_MAX_RECORDS 96U #define DNSSEC_MAX_RRSET 16U @@ -280,6 +287,173 @@ xaios_status_t dnssec_set_trust_anchors(const dnssec_ds_t *anchors, uint32_t cou copy_bytes(g_anchors, anchors, count * sizeof(g_anchors[0])); g_anchor_count = count; return XAIOS_OK; } +/* base32hex (RFC 4648 section 7), the encoding NSEC3 owner labels use. */ +static int base32hex_value(uint8_t c) { + if (c >= '0' && c <= '9') return c - '0'; + if (c >= 'A' && c <= 'V') return c - 'A' + 10; + if (c >= 'a' && c <= 'v') return c - 'a' + 10; + return -1; +} + +/* Decode the first label of an NSEC3 owner name into its hash. */ +static int nsec3_owner_hash(const char *owner, uint8_t *out, uint32_t capacity, + uint32_t *out_length) { + uint32_t bits = 0U, accumulator = 0U, produced = 0U; + uint32_t i = 0U; + for (; owner[i] != '\0' && owner[i] != '.'; ++i) { + int value = base32hex_value((uint8_t)owner[i]); + if (value < 0) return -1; + accumulator = (accumulator << 5U) | (uint32_t)value; + bits += 5U; + if (bits >= 8U) { + bits -= 8U; + if (produced >= capacity) return -1; + out[produced++] = (uint8_t)(accumulator >> bits); + } + } + /* A partial group must be zero padding, never discarded data. */ + if (i == 0U || (accumulator & ((1U << bits) - 1U)) != 0U) return -1; + *out_length = produced; + return 0; +} + +/* H(name) = SHA1(wire_name || salt), then iterated over H || salt. */ +static int nsec3_hash(const char *name, const uint8_t *salt, uint32_t salt_length, + uint16_t iterations, uint8_t *out) { + uint8_t wire[256]; + uint32_t wire_length = 0U; + br_sha1_context ctx; + if (iterations > DNSSEC_NSEC3_MAX_ITERATIONS) return -1; + if (canonical_name(name, wire, sizeof(wire), &wire_length) != 0) return -1; + br_sha1_init(&ctx); + br_sha1_update(&ctx, wire, wire_length); + br_sha1_update(&ctx, salt, salt_length); + br_sha1_out(&ctx, out); + for (uint32_t i = 0U; i < iterations; ++i) { + br_sha1_init(&ctx); + br_sha1_update(&ctx, out, 20U); + br_sha1_update(&ctx, salt, salt_length); + br_sha1_out(&ctx, out); + } + return 0; +} + +static int hash_compare(const uint8_t *a, const uint8_t *b, uint32_t n) { + for (uint32_t i = 0U; i < n; ++i) if (a[i] != b[i]) return a[i] < b[i] ? -1 : 1; + return 0; +} + +/* True when target lies strictly between owner and next in NSEC3 hash order, + accounting for the wrap at the last record of the zone's ordered chain. */ +static int nsec3_covers(const uint8_t *owner, const uint8_t *next, + const uint8_t *target) { + int wrapped = hash_compare(owner, next, 20U) >= 0; + int above_owner = hash_compare(target, owner, 20U) > 0; + int below_next = hash_compare(target, next, 20U) < 0; + return wrapped ? (above_owner || below_next) : (above_owner && below_next); +} + +static int type_bitmap_has(const uint8_t *bitmap, uint32_t length, + uint16_t type) { + uint32_t p = 0U; + while (p + 2U <= length) { + uint8_t window = bitmap[p]; + uint8_t bytes = bitmap[p + 1U]; + p += 2U; + if (bytes == 0U || bytes > 32U || bytes > length - p) return -1; + if ((uint32_t)(type >> 8U) == window) { + uint32_t bit = type & 0xffU; + if (bit / 8U < bytes && + (bitmap[p + bit / 8U] & (uint8_t)(0x80U >> (bit & 7U))) != 0U) { + return 1; + } + } + p += bytes; + } + return p == length ? 0 : -1; +} + +/* Prove that a delegation carries no DS, which makes the child zone insecure + rather than bogus. Two shapes are accepted, both signed by the parent: + an NSEC3 matching the delegation exactly whose bitmap has NS without DS, + and an opt-out NSEC3 whose hash range covers the delegation. */ +xaios_status_t dnssec_verify_no_ds(const uint8_t *message, uint32_t length, + const char *child_zone, + const dnssec_keyset_t *keys, + uint64_t wall_time_ns) { + if (message == 0 || child_zone == 0 || keys == 0) return XAIOS_ERR_INVALID; + if (parse_records(message, length) != 0) return XAIOS_ERR_INVALID; + for (uint32_t i = 0U; i < g_record_count; ++i) { + const dnssec_rr_t *rr = &g_records[i]; + const uint8_t *r = rr->rdata; + uint8_t salt_length, hash_length; + uint16_t iterations; + uint8_t target[20], owner_hash[20]; + uint32_t owner_hash_length = 0U, bitmap_offset; + if (rr->type != DNSSEC_TYPE_NSEC3 || rr->rdata_length < 6U) continue; + if (r[0] != DNSSEC_NSEC3_SHA1) continue; + iterations = get_be16(r + 2U); + salt_length = r[4]; + if ((uint32_t)5U + salt_length + 1U > rr->rdata_length) continue; + hash_length = r[5U + salt_length]; + if (hash_length != 20U) continue; + bitmap_offset = 6U + (uint32_t)salt_length + hash_length; + if (bitmap_offset > rr->rdata_length) continue; + if (nsec3_hash(child_zone, r + 5U, salt_length, iterations, target) != 0) { + continue; + } + if (nsec3_owner_hash(rr->owner, owner_hash, sizeof(owner_hash), + &owner_hash_length) != 0 || + owner_hash_length != 20U) { + continue; + } + if (hash_compare(owner_hash, target, 20U) == 0) { + const uint8_t *bitmap = r + bitmap_offset; + uint32_t bitmap_length = rr->rdata_length - bitmap_offset; + int has_ds = type_bitmap_has(bitmap, bitmap_length, DNSSEC_TYPE_DS); + int has_ns = type_bitmap_has(bitmap, bitmap_length, 2U /* NS */); + if (has_ds != 0 || has_ns != 1) continue; + } else if ((r[1] & DNSSEC_NSEC3_OPT_OUT) != 0U && + nsec3_covers(owner_hash, r + 6U + salt_length, target) != 0) { + /* Opt-out: the span is unsigned, so the delegation is insecure. */ + } else { + continue; + } + if (verify_rrset(message, length, rr->owner, DNSSEC_TYPE_NSEC3, keys, + wall_time_ns)) { + return XAIOS_OK; + } + } + return XAIOS_ERR_NOT_FOUND; +} + +/* Read an address out of an unsigned answer. Only reached once the chain has + proven the zone insecure, so there is no signature to check; the owner and + type still have to match what was asked. */ +xaios_status_t dnssec_extract_address_insecure(const uint8_t *message, + uint32_t length, + const char *hostname, + uint16_t type, + uint8_t *out_address, + uint32_t *out_ttl) { + uint32_t want = type == XAIOS_DNS_TYPE_A ? 4U : 16U; + if (message == 0 || hostname == 0 || out_address == 0 || out_ttl == 0) { + return XAIOS_ERR_INVALID; + } + if (parse_records(message, length) != 0) return XAIOS_ERR_INVALID; + for (uint32_t i = 0U; i < g_record_count; ++i) { + const dnssec_rr_t *rr = &g_records[i]; + if (rr->type != type || rr->rr_class != XAIOS_DNS_CLASS_IN || + rr->rdata_length != want || !name_equal(rr->owner, hostname)) { + continue; + } + copy_bytes(out_address, rr->rdata, want); + *out_ttl = rr->ttl; + return XAIOS_OK; + } + return XAIOS_ERR_NOT_FOUND; +} + xaios_status_t dnssec_verify_dnskey(const uint8_t *message, uint32_t length, const char *zone, const dnssec_dsset_t *parent_ds, uint64_t wall_time_ns, dnssec_keyset_t *out) { if (zone == 0 || out == 0 || parse_records(message, length) != 0) return XAIOS_ERR_INVALID; zero_bytes(out, sizeof(*out)); uint32_t oi = 0U; while (oi + 1U < sizeof(out->owner) && zone[oi]) { out->owner[oi] = zone[oi]; ++oi; } out->owner[oi] = '\0'; diff --git a/tests/storage/test_mutable_fs_mirror.c b/tests/storage/test_mutable_fs_mirror.c new file mode 100644 index 00000000..dc693524 --- /dev/null +++ b/tests/storage/test_mutable_fs_mirror.c @@ -0,0 +1,150 @@ +/* A/B metadata recovery. + * + * The metadata region is rewritten in place, so a write interrupted by power + * loss leaves it neither valid nor blank, and mount refuses to continue + * rather than format over a volume that might still hold data. That made an + * interrupted metadata write unrecoverable. A second copy is kept past the + * data region and writes alternate between the two, so mount can fall back. + * + * These tests damage a copy the way a torn write would and require the volume + * to keep mounting with its contents intact. + */ +#include +#include +#include + +#include +#include + +/* Kernel dependencies the filesystem pulls in, reduced to what a hosted run + needs. The virtio path is unreachable here: this test mounts a registered + block device, never the in-image volume. */ +void klog(const char *fmt, ...) { (void)fmt; } +uint32_t smp_online_count(void) { return 1U; } +void panic_at(const char *file, int line, const char *fmt, ...) { + (void)fmt; + fprintf(stderr, "panic at %s:%d\n", file, line); + __builtin_trap(); +} +xaios_status_t virtio_block_read_sector(uint64_t s, void *b, uint64_t n) { + (void)s; (void)b; (void)n; return XAIOS_ERR_IO; +} +xaios_status_t virtio_block_write_sector(uint64_t s, const void *b, uint64_t n) { + (void)s; (void)b; (void)n; return XAIOS_ERR_IO; +} +xaios_status_t virtio_block_flush(void) { return XAIOS_ERR_IO; } +uint64_t virtio_block_capacity_sectors(void) { return 0U; } + +#define SECTOR 512U +/* Room for metadata + journal + data + the mirror that follows them. */ +#define DISK_SECTORS (3072U + 1280U + 2U + 8192U + 1280U + 64U) + +static uint8_t g_disk[(uint64_t)DISK_SECTORS * SECTOR]; +static xaios_block_device_t g_device; + +static xaios_status_t disk_read(void *context, uint64_t offset, void *buffer, + uint64_t length) { + (void)context; + if (offset + length > sizeof(g_disk)) return XAIOS_ERR_INVALID; + memcpy(buffer, g_disk + offset, (size_t)length); + return XAIOS_OK; +} + +static xaios_status_t disk_write(void *context, uint64_t offset, + const void *buffer, uint64_t length) { + (void)context; + if (offset + length > sizeof(g_disk)) return XAIOS_ERR_INVALID; + memcpy(g_disk + offset, buffer, (size_t)length); + return XAIOS_OK; +} + +static xaios_status_t disk_flush(void *context) { + (void)context; + return XAIOS_OK; +} + +static const xaios_block_backend_ops_t k_ops = { + disk_read, disk_write, disk_flush, 0, 0, +}; + +static void register_disk(void) { + xaios_block_device_info_t info; + memset(&info, 0, sizeof(info)); + snprintf(info.identifier, sizeof(info.identifier), "/dev/mirror0"); + snprintf(info.backend, sizeof(info.backend), "test"); + info.capacity_bytes = sizeof(g_disk); + info.capacity_logical_sectors = DISK_SECTORS; + info.logical_sector_size = SECTOR; + info.physical_block_size = SECTOR; + info.max_transfer_bytes = SECTOR; + info.flush_supported = 1U; + info.read_only = 0U; + assert(block_device_register(&g_device, &info, &k_ops, 0) == XAIOS_OK); +} + +/* Overwrite a metadata copy the way an interrupted write would: some sectors + * carry the new image, the rest still hold the old one, so the region is + * self-inconsistent without being blank. */ +static void tear_slot(uint64_t start_sector) { + for (uint32_t i = 0U; i < 8U; ++i) { + memset(g_disk + ((uint64_t)start_sector + i) * SECTOR, 0xA5, SECTOR); + } +} + +static uint64_t primary_start(void) { return 3072U; } +static uint64_t mirror_start(void) { return 3072U + 1280U + 2U + 8192U; } + +static void mount_fresh(void) { + assert(mutable_fs_mount_device("/dev/mirror0") == XAIOS_OK); +} + +int main(void) { + register_disk(); + + /* Create a volume with real content and commit it. */ + mount_fresh(); + assert(mutable_fs_mkdir("/state") == XAIOS_OK); + assert(mutable_fs_write("/state/keep", "durable", 7U) == XAIOS_OK); + assert(mutable_fs_commit("initial") == XAIOS_OK); + /* Several writes, so the slots have alternated and both hold real images. */ + for (uint32_t i = 0U; i < 4U; ++i) { + assert(mutable_fs_write("/state/keep", "durable", 7U) == XAIOS_OK); + } + mutable_fs_unmount(); + + /* A torn primary must not stop the volume mounting. */ + tear_slot(primary_start()); + mount_fresh(); + char buffer[32]; + uint64_t read_bytes = 0U; + assert(mutable_fs_read("/state/keep", buffer, sizeof(buffer), &read_bytes) == + XAIOS_OK); + assert(read_bytes == 7U && memcmp(buffer, "durable", 7U) == 0); + printf("mutable-fs-mirror: torn primary recovered, contents intact\n"); + + /* Writing after that recovery must restore a good second copy, so the + volume is not left one tear away from being unmountable. */ + assert(mutable_fs_write("/state/keep", "durable", 7U) == XAIOS_OK); + assert(mutable_fs_commit("after-recovery") == XAIOS_OK); + mutable_fs_unmount(); + + /* Now tear the other copy and require the same outcome. */ + tear_slot(mirror_start()); + mount_fresh(); + read_bytes = 0U; + assert(mutable_fs_read("/state/keep", buffer, sizeof(buffer), &read_bytes) == + XAIOS_OK); + assert(read_bytes == 7U && memcmp(buffer, "durable", 7U) == 0); + printf("mutable-fs-mirror: torn mirror recovered, contents intact\n"); + mutable_fs_unmount(); + + /* Both copies damaged must still refuse rather than format over the + volume: falling back is a recovery, not a licence to discard data. */ + tear_slot(primary_start()); + tear_slot(mirror_start()); + assert(mutable_fs_mount_device("/dev/mirror0") != XAIOS_OK); + printf("mutable-fs-mirror: both copies damaged still refuses to format\n"); + + printf("mutable-fs-mirror: all A/B metadata recovery tests passed\n"); + return 0; +} diff --git a/userspace/sshd/ssh_host_key.c b/userspace/sshd/ssh_host_key.c index c4c51006..c2477e02 100644 --- a/userspace/sshd/ssh_host_key.c +++ b/userspace/sshd/ssh_host_key.c @@ -1,4 +1,5 @@ #include "ssh_host_key.h" +#include "sshd.h" #include "ssh_crypto.h" #include "ssh_utils.h" #include "tweetnacl_subset.h" @@ -9,6 +10,9 @@ static uint8_t g_host_private_key[32]; static uint8_t g_host_public_key[32]; static uint32_t g_key_initialized = 0; +/* Set when the key in use could not be written to persistent storage, so the + condition can be reported rather than silently tolerated. */ +static uint32_t g_host_key_ephemeral = 0; /* Convert hex char to nibble */ static int hex_to_nibble(char c) { @@ -62,15 +66,27 @@ static int ensure_key(void) { } xaios_ed25519_public_key(g_host_public_key, g_host_private_key); - /* Save private key to persistent storage */ + /* Save private key to persistent storage. + + A failure here used to abort SSH startup, which made an unwritable + persistent filesystem mean no remote access at all. The key pair in + hand is perfectly good; only its durability is in question, so the + service continues with it rather than leaving the machine unreachable + at exactly the moment an operator needs to get in and repair storage. + + The cost is a host key that does not survive this boot, which clients + see as a changed key and warn about. That warning is the point: it is + visible, whereas an unreachable machine offers nothing to act on. */ char hex_buf[65]; bin_to_hex(g_host_private_key, 32, hex_buf); int save_ret = xaios_write_file(HOST_KEY_PATH, hex_buf); ssh_mem_zero(hex_buf, sizeof(hex_buf)); if (save_ret != 64) { - ssh_mem_zero(g_host_private_key, sizeof(g_host_private_key)); - ssh_mem_zero(g_host_public_key, sizeof(g_host_public_key)); - return -1; + g_host_key_ephemeral = 1U; + ssh_log(SSH_LOG_ERROR, + "Host key could not be persisted; continuing with an ephemeral " + "key. Clients will report a changed host key until persistent " + "storage is repaired.\n"); } g_key_initialized = 1; @@ -82,6 +98,10 @@ int ssh_host_key_init(void) { return ensure_key(); } +int ssh_host_key_is_ephemeral(void) { + return g_host_key_ephemeral != 0U; +} + int ssh_host_key_reload(void) { ssh_mem_zero(g_host_private_key, sizeof(g_host_private_key)); ssh_mem_zero(g_host_public_key, sizeof(g_host_public_key)); diff --git a/userspace/sshd/ssh_host_key.h b/userspace/sshd/ssh_host_key.h index 386da299..d28aa650 100644 --- a/userspace/sshd/ssh_host_key.h +++ b/userspace/sshd/ssh_host_key.h @@ -5,6 +5,9 @@ /* Persistent Ed25519 host identity seeded from the kernel entropy service. */ int ssh_host_key_init(void); +/* True when the active host key could not be persisted, so it will not + survive this boot and clients will report it as changed. */ +int ssh_host_key_is_ephemeral(void); int ssh_host_key_reload(void); int ssh_host_key_get_private(uint8_t priv[32]); int ssh_host_key_get_public(uint8_t pub[32]); diff --git a/wiki/Boot-and-Console.md b/wiki/Boot-and-Console.md index 38699de0..0fcb0510 100644 --- a/wiki/Boot-and-Console.md +++ b/wiki/Boot-and-Console.md @@ -70,6 +70,19 @@ not create a shell session. The same byte-oriented console interface accepts USB HID boot-keyboard input from the default xHCI device on both QEMU ARM64 and QEMU x86_64; PL011 serial remains available when no USB keyboard is attached. +## Diagnosing a boot failure + +A panic prints registers, a backtrace, and the tail of the kernel log. That +last section matters because a normal boot redraws the progress display over +the serial console, so the message explaining a failure is cleared from the +screen moments before the panic replaces it. Capture starts at the very +beginning of boot and does not depend on storage, so it is available even for +failures that happen before any filesystem is mounted. + +Boot-time reads of the boot image retry a bounded number of times before +failing. A read that only succeeded on a retry is logged, so a marginal device +stays visible rather than being silently absorbed. + ## Rebuilding over an existing persistent disk The active administration configuration lives in persistent storage, and a diff --git a/wiki/Current-Limitations.md b/wiki/Current-Limitations.md index b59fe101..95b47165 100644 --- a/wiki/Current-Limitations.md +++ b/wiki/Current-Limitations.md @@ -57,12 +57,14 @@ Progress status and ownership live only in [[Project Tracker|Project-Tracker]]. - DNS performs asynchronous A/AAAA resolution with timeout, retry, bounded TTL cache, and DNS-over-TCP fallback. It locally validates DNSKEY, DS, and RRSIG chains from compiled root DS anchors and accepts signed exact-owner NSEC NODATA proofs. - NXDOMAIN, NSEC3, CNAME/DNAME and wildcard synthesis, plus production root-anchor - rollover/update policy, remain unsupported and fail closed. DNSSEC has three - outcomes and the resolver implements two: an unsigned delegation, whose - absent DS can only be proven under the opt-out NSEC3 its parent uses, is - refused as bogus rather than accepted as insecure. Names under such a - delegation, `nip.io` among them, therefore do not resolve. + It also resolves names under an unsigned delegation, proving the absent DS + from a signed NSEC3 the parent serves, including the opt-out form, and then + accepting the unsigned answer as insecure rather than refusing it as bogus. + Insecure answers are counted separately from authenticated ones, because + they carry a weaker guarantee. NSEC3 iteration counts above 150 are refused + rather than computed. NXDOMAIN, CNAME/DNAME and wildcard synthesis, plus + production root-anchor rollover/update policy, remain unsupported and fail + closed. - The SNTP client validates request binding, server mode/version, stratum, and bounded retry/timeout behavior, then applies corrections through a monotonic 500-ppm slew after initial calibration. Boot performs one bounded, non-fatal @@ -106,6 +108,14 @@ Progress status and ownership live only in [[Project Tracker|Project-Tracker]]. - ModelFS activation and MutableFS audit persistence are separate durability domains. A post-publication audit failure cannot roll back an already published active generation. +- MutableFS v5 keeps two metadata copies and alternates writes between them, + so a write interrupted by power loss damages only the copy that is not + currently authoritative and mount falls back to the survivor. The mirror + sits past the data region, so volumes written before it keep mounting, and + a volume with no room for it operates single-copy. When both copies are + damaged the mount still refuses rather than formatting, because falling + back is a recovery and not a licence to discard data. Host tests damage + each copy in turn and require the volume to mount with contents intact. - MutableFS v5 is intentionally bounded to 256 nodes, 256 open handles, 256 KiB files and 4 MiB of data space. Interactive `nano` is further bounded to a 32 KiB editing buffer. This is suitable for OS state and small user files, @@ -127,10 +137,9 @@ Progress status and ownership live only in [[Project Tracker|Project-Tracker]]. ISRG roots with server-name and validity checks, or an exact RSA public-key pin for a private origin. Chain validation depends on the realtime clock set during boot and refuses an unset one. The shipped configuration currently - sets `tls=off` and fetches over plain HTTP, because the resolver cannot - return an address for the origin name; signed catalogs and per-artifact + sets `tls=off` and fetches over plain HTTP; signed catalogs and per-artifact hashes remain the authenticity layer, and transport confidentiality is - forfeited until that is restored. It supports signed + forfeited until TLS is restored. It supports signed release-root rotation, revocation, offline recovery, and rollback of an interrupted trust/catalog activation. The checked-in TLS and signing private fixtures are public; production key custody and release authorization remain