fix(module): admit the user's private group and name the refused ancestor

[senamakel]

Problem

On Linux, OpenHuman refuses to load its modules with module directory is writable by another user. In Sentry this is TAURI-RUST-1197/1198/1199: about 70 users, still happening on 0.64.15.

check_directory walks every ancestor of the module directory up to /. It refuses any ancestor that is group-writable without the sticky bit, unless root_equivalent_group exempts it, and that exemption only exists on macOS.

On distributions that give each user a private group (Ubuntu, Debian, Fedora, with umask 002), $HOME and ~/.cache are often group-writable by the user's own private group. That isn't a trust problem, but it refused the bundle. It also refused the 0.64.15 per-user cache fallback (~/.cache/openhuman/modules), because secure_release_cache deliberately never repairs $HOME. So these users can never load a module.

The refusal also never said which ancestor failed, so we couldn't diagnose it from telemetry.

Fix

• Private group: group write is now allowed on a directory owned by the current user or root when its group is the user's private group. That means the gid is the user's primary gid, the group is named after the user, and the group has no member other than the user (is_user_private_group / current_user_private_gid, using getpwuid_r/getgrgid_r). If any lookup fails, the directory is refused.
• Unchanged: world-writable directories, directories writable by a shared group, and directories owned by another user are still refused.
• Naming the ancestor: the refusal now names the failing ancestor as one path component, plus its mode: module directory is writable by another user at cache mode 0775. The existing prefix is unchanged, and is_placement_refusal matches on it.
• No account names: the home directory, and any directory directly under /home, /Users or /var/home, are labelled generically, so a user name never reaches telemetry.
• Dependency: libc is added as an optional unix dependency behind the modules feature.

Tests

Each test was run on the old code first.

• host_tests.rs:
  • private-group write is admitted (failed before the fix);
  • shared-group write is still refused (guard; passes before and after);
  • the refusal names the ancestor (failed before the fix);
  • another account's home is not named (failed before the fix).
• host_admission_tests.rs: end-to-end admission through a private-group ancestor.
• Results:
  • cargo test --locked --all-features: 417 passed;
  • cargo clippy --locked --all-targets --all-features -D warnings: clean;
  • cargo check --no-default-features: clean.

Some commit subjects on this branch were written by an automatic checkpoint hook and don't describe their diffs. The diff and this description are authoritative.

The OpenHuman PR that bumps the gitlink follows.

Summary by CodeRabbit

• Bug Fixes

  • Module loading now accepts directories writable by the current user’s verified private primary group, while continuing to refuse unsafe shared or world-writable directories.
  • Directory permission refusals identify the failing ancestor category and its mode without exposing account names or full paths.

• Documentation

  • Clarified Unix directory ownership and permission checks, including sticky-bit, private-group, and accepted root-owned group exceptions.

[tinysweeper]

Tiny Sweeper review

Tiny Sweeper completed its review; deterministic results follow.

State: Changes requested
Priority: high
Reviewed head: 1a570eeb1ace
Updated: 1791595276 (Unix time)

Review snapshot

Change surface	Files	Review signal	Count
Production	2	Active findings	9
Tests	2	Noted findings	0
Documentation	1	Resolved findings	34
Configuration	1	Pending checks/questions	0

Completeness: Complete
Test assessment: No supported feature-to-test mapping was available; this does not mean tests are absent or passed.

What changed

The Unix directory walk in `crates/tinybus/src/module/host.rs#fn check_directory(path: &Path) -> Result<()>` resolves the current user's private group lazily via a `OnceCell`, only when a group-writable, non-sticky directory owned by the user or root is encountered and the directory carries no extended ACL (`has_extended_acl`, fail-closed on probe error, `true` stub on non-Linux Unixes disabling the exception). The private-group determination (`private_group_in`, `current_user_private_gid`) parses the text of `/etc/passwd` and `/etc/group` only when `accounts_are_local` confirms `nsswitch.conf` names no directory service — now including an `initgroups` database line when present — and any malformed or comment record in either file returns `None` because such a record could share the gid. New in this push: a candidate private gid inside any `/etc/subgid` subordinate range is treated as delegated to another account and refused, and an unreadable or malformed subgid file fails closed. When nsswitch mentions `systemd`, the gid must be in the 1,000–60,000 regular-user range and every directory in `SYSTEMD_USER_RECORD_DIRECTORIES` must have no entries (`directory_has_no_entries`, fail-closed on unreadable). A refusal ends by naming the failing ancestor and its mode, with `crates/tinybus/src/module/host.rs#const PLACEMENT_REFUSALS: &[&str] = &[` matching extended to prefix matching so `is_placement_refusal` still classifies the suffixed reasons. `crates/tinybus/src/error.rs#pub enum Error {` documentation states that a unix directory refusal names one ancestor component without carrying a full path. `crates/tinybus/src/module/host.rs#fn has_library_extension(path: &Path) -> bool` appears in the changed-symbol list but its role in this diff is not evidenced. Documentation in `docs/modules/module/README.md#reported, not replaced by a download.` scopes the private-group exception to Linux only, describes the nsswitch gate including the systemd-user-record precondition, and documents the sanitized ancestor naming — though it still claims an XDG location like `.cache` is named in refusals.

Features

• Added — Optional libc dependency: The gate's `getuid` call and the Linux ACL probe (`getxattr`) use an optional `libc` dependency gated behind the `modules` feature on unix targets; the tests lane reports this is now correctly feature-gated. (crates/tinybus/Cargo.toml#cli = [, crates/tinybus/Cargo.toml#zip = { version = "2", optional = true, default-features = false, features = ["d)

Tests

No supported feature-to-test mapping was produced. Test execution is not inferred.

Findings

• high · critique · Reject systemd-backed account databases — This still authorizes a private-group exception when `nsswitch.conf` contains `systemd` if the candidate GID is in the chosen range and a fixed set of userdb directories is empty. (crates/tinybus/src/module/host\.rs:2232)
• high · critique · Reject systemd as a private-group account source — A configuration such as `passwd: files systemd`, `group: files systemd`, and `initgroups: files systemd` is treated as local and can reach the private-group exception. The later di (crates/tinybus/src/module/host\.rs:2083)
• medium · critique · Resolve the private group for each ancestor — The `OnceCell` caches the result of reading `/etc/passwd` and `/etc/group` for the entire ancestor walk. Those files can change between checks, so a later ancestor can be authorize (crates/tinybus/src/module/host\.rs:1949)
• high · security · Reject systemd-backed account databases for private-group authorization — `accounts_are_local` still classifies `systemd` as local. Consequently, `current_user_private_gid` can authorize the private-group exception when the listed userdb directories are (crates/tinybus/src/module/host\.rs:2073)
• medium · description · Correct the README's claim that `.cache` is named — `ancestor_label` names only the filesystem root, the module directory itself, `$HOME`, and a component directly beneath `/` that appears in `REPORTABLE_ROOT_CHILDREN` (`opt`, `usr` (\(pull request description\))
• medium · description · Make the private-group admission test fail loudly, not skip silently — The only end-to-end test that a group-writable private-group ancestor passes `check_directory` returns early when the running account has no private group. On CI runners and macOS (\(pull request description\))

Previously reported and still active

• Reject private-group status when group records are incomplete
• Reject private-group authorization with a systemd NSS backend
• Describe systemd account-source handling accurately

Resolved this pass

• Do not log the full ancestor path
• Do not report arbitrary hidden directory names
• Do not assume temp directories lack inherited ACLs
• Validate the ACL probe result before allowing the private-group exception
• Gate the libc dependency to the code that needs it
• Do not assume temp directories lack inherited ACLs
• Validate the ACL probe result before allowing the private-group exception
• Make the private-group admission test fail loudly, not skip silently
• Do not trust a shared primary GID as user-private
• Document only refusal details emitted by the loader
• Verify that no other account owns the private group
• Do not log the full ancestor path
• Do not trust supplementary membership as proof of a private group
• Account for ACL grants in private-group exceptions
• Require the private-group test to reject false negatives
• Do not report arbitrary hidden directory names
• Evaluate private-group ownership for every group-writable directory
• Treat a completed passwd enumeration according to libc semantics
• Assert the ACL probe result for a plain directory
• Reject private-group status when the passwd enumeration is capped
• Restrict reported ancestor names to fixed locations
• Avoid authorizing a mutable group identity from a stale lookup
• Do not treat systemd user databases as local-only
• Avoid authorizing a mutable group identity from stale lookup data
• Reject systemd-backed account databases for private-group authorization
• Reject private-group status when account files are incomplete
• Reject private-group status when passwd records are incomplete
• Validate the ACL probe result before allowing the private-group exception
• Require initgroups to be exclusively local
• Avoid caching a mutable group identity across the directory walk
• Gate the libc dependency to the code that needs it
• Reject duplicate passwd names before authorizing a private group
• Do not assume the test directory lacks an inherited ACL
• Do not assume temp directories lack inherited ACLs

Before merge

• Address carried finding Reject private-group status when group records are incomplete.
• Address carried finding Reject private-group authorization with a systemd NSS backend.
• Address carried finding Describe systemd account-source handling accurately.
• Address Reject systemd-backed account databases (crates/tinybus/src/module/host\.rs).
• Address Reject systemd as a private-group account source (crates/tinybus/src/module/host\.rs).
• Address Reject systemd-backed account databases for private-group authorization (crates/tinybus/src/module/host\.rs).

How this fits together

flowchart LR
  n0["check_directory<br/>changed<br/>4 findings"]:::blocking
  n1["has_library_extension<br/>changed<br/>4 findings"]:::blocking
  n2["load_dir"]:::impacted
  n3["ModuleInfo"]:::impacted
  n4["Err"]:::impacted
  n5["module_refused"]:::impacted
  n6["scan_dir"]:::impacted
  n7["new"]:::impacted
  n0 -->|calls| n4
  n0 -->|calls| n5
  n2 -->|calls| n0
  n2 -->|calls| n1
  n2 -->|uses| n3
  n2 -->|calls| n4
  n2 -->|calls| n5
  n2 -->|calls| n7
  n6 -->|calls| n0
  n6 -->|calls| n1
  n6 -->|uses| n3
  n6 -->|calls| n7
  classDef changed fill:#0d4429,stroke:#238636,color:#e6edf3
  classDef impacted fill:#161b22,stroke:#6e7681,color:#c9d1d9
  classDef flagged fill:#5a1e02,stroke:#d93f0b,color:#ffffff
  classDef blocking fill:#67060c,stroke:#f85149,color:#ffffff

Loading

Agent review details

critique

• Conclusion: Failure
• Scope reviewed: all assigned evidence
• Lane summary: Reviewed 2 files; 4 findings. (1 already reported on an earlier push) (36 earlier finding(s) still open) _Code retrieval was unavailable (model: ladder embeddings returned 400 Bad Request: {"error":{"message":"unknown ladder vectors; known ladders are flash (also chat-v1, flash-v1), instant (also no-think, instant-v1), reasoning (also deepseek), max-reasoning (also max-reasoning-v1), deepseek-flash (also reasoning-v1, agentic-v1), deep (also luna), scribe, uncensored, vectors-oai3 (also embeddings-oai3-v1), vision (also vision-v1, multimodal-v1), image (also images-v1, image-v1), vi), so this review saw the diff alone._ _Memory was unavailable (model: cortex: v1/recall: error sending request for url (http://cortexdb:3141/v1/recall\)\), so this review ran without it._
• Evidence: crates/tinybus/src/module/host\.rs — Reject systemd-backed account databases
• Evidence: crates/tinybus/src/module/host\.rs — Reject systemd as a private-group account source
• Evidence: crates/tinybus/src/module/host\.rs — Resolve the private group for each ancestor

security

• Conclusion: Failure
• Scope reviewed: all assigned evidence
• Lane summary: Reviewed 2 files; 2 findings. (1 already reported on an earlier push) (45 earlier finding(s) still open) _Code retrieval was unavailable (model: ladder embeddings returned 400 Bad Request: {"error":{"message":"unknown ladder vectors; known ladders are flash (also chat-v1, flash-v1), instant (also no-think, instant-v1), reasoning (also deepseek), max-reasoning (also max-reasoning-v1), deepseek-flash (also reasoning-v1, agentic-v1), deep (also luna), scribe, uncensored, vectors-oai3 (also embeddings-oai3-v1), vision (also vision-v1, multimodal-v1), image (also images-v1, image-v1), vi), so this review saw the diff alone._ _Memory was unavailable (model: cortex: v1/recall: error sending request for url (http://cortexdb:3141/v1/recall\)\), so this review ran without it._
• Evidence: crates/tinybus/src/module/host\.rs — Reject systemd-backed account databases for private-group authorization

tests

• Conclusion: Success
• Scope reviewed: all assigned evidence
• Lane summary: This is a large batch that resolves nearly every open concern: the libc dependency is now feature-gated and cfg(unix)-gated, private-group authorization is computed only from local files with exclusivity checks, systemd and NSS backends are rejected, subgid delegation is checked, ACL probes are consulted on Linux and fail closed elsewhere, the per-walk gid is cached but never the account identity, and error text is reduced to fixed labels. The behaviour is pinned by substantive unit tests plus an end-to-end directory-walk test; the change looks safe to merge. (49 earlier finding(s) still open) _Code retrieval was unavailable (model: ladder embeddings returned 400 Bad Request: {"error":{"message":"unknown ladder vectors; known ladders are flash (also chat-v1, flash-v1), instant (also no-think, instant-v1), reasoning (also deepseek), max-reasoning (also max-reasoning-v1), deepseek-flash (also reasoning-v1, agentic-v1), deep (also luna), scribe, uncensored, vectors-oai3 (also embeddings-oai3-v1), vision (also vision-v1, multimodal-v1), image (also images-v1, image-v1), vi), so this review saw the diff alone._ _Memory was unavailable (model: cortex: v1/recall: error sending request for url (http://cortexdb:3141/v1/recall\)\), so this review ran without it._

commits

• Conclusion: Neutral
• Scope reviewed: all assigned evidence
• Lane summary: Nothing sensitive found in what this pull request commits.

description

• Conclusion: Success
• Scope reviewed: all assigned evidence
• Lane summary: The private-group exception is now correctly gated on local-only account databases, exclusive group membership, ACL absence, subordinate-gid delegation and empty systemd userdb directories, and refusals name the failing ancestor without leaking paths or account names; the earlier findings on all of these are addressed. Two documentation/test concerns remain: the README still claims `.cache` is a named location when the code never names it, and the end-to-end private-group admission test still skips silently when the runner has no private group. (3 earlier finding(s) still open) _Code retrieval was unavailable (model: ladder embeddings returned 400 Bad Request: {"error":{"message":"unknown ladder vectors; known ladders are flash (also chat-v1, flash-v1), instant (also no-think, instant-v1), reasoning (also deepseek), max-reasoning (also max-reasoning-v1), deepseek-flash (also reasoning-v1, agentic-v1), deep (also luna), scribe, uncensored, vectors-oai3 (also embeddings-oai3-v1), vision (also vision-v1, multimodal-v1), image (also images-v1, image-v1), vi), so this review saw the diff alone._ _Memory was unavailable (model: cortex: v1/recall: error sending request for url (http://cortexdb:3141/v1/recall\)\), so this review ran without it._
• Evidence: \(pull request description\) — Correct the README's claim that `.cache` is named
• Evidence: \(pull request description\) — Make the private-group admission test fail loudly, not skip silently

e2e

• Conclusion: Neutral
• Scope reviewed: all assigned evidence
• Lane summary: No end-to-end harness in this repository: no e2e test files and no e2e workflow.

Evidence and run details

• Models: gpt-5.6-luna, glm-5.3-flash
• Spend: $0.018660
• Tokens: 389895 input · 24838 output · 53768 cached · 0 embedding
• Continuity: summary cache chain restarted at the storage ceiling.

Head	State	Pass summary
0a2771039a18	changes requested	6 active finding(s), 55 resolved finding(s) (at 1791593446)
74d0ce5f33c2	changes requested	9 active finding(s), 56 resolved finding(s) (at 1791594054)
0133ac74e5d1	changes requested	9 active finding(s), 106 resolved finding(s) (at 1791594443)
cd4c0ec5e538	changes requested	5 active finding(s), 120 resolved finding(s) (at 1791594902)
1a570eeb1ace	changes requested	6 active finding(s), 34 resolved finding(s) (at 1791595276)

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Reviewing files that changed from the base of the PR and between 3f892af and 1a570ee.

---

📒 Files selected for processing (3)

• crates/tinybus/src/module/host.rs
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• docs/modules/module/README.md

---

---

📝 Walkthrough

Walkthrough

Unix module-directory admission now checks group-writable ancestors against verified private primary-group status. Refusal details include a sanitized ancestor label and mode. Tests and documentation cover admission rules, refusal behavior, account lookups, and path redaction.

Changes

Unix directory admission

Layer / File(s)	Summary
Private-group admission crates/tinybus/Cargo.toml, crates/tinybus/src/module/host.rs, crates/tinybus/src/module/host_admission_tests.rs, crates/tinybus/src/module/host_tests.rs, docs/modules/module/README.md	The modules feature enables Unix-only libc. The directory walk uses verified private-group status when it checks group-writable ancestors. Tests and documentation cover the admission rules.
Refusal details and classification crates/tinybus/src/module/host.rs, crates/tinybus/src/module/host_tests.rs, crates/tinybus/src/error.rs, docs/modules/module/README.md	Unix directory refusals identify the failing ancestor and its mode without exposing arbitrary paths. Placement-refusal matching handles reasons with appended ancestor details. Tests and documentation cover refusal details.

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Bug fix

Suggested reviewers: m3ga-mind

---

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✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly summarizes the main changes: private-group admission and naming the refused ancestor.
Docstring Coverage		Docstring coverage is 92.59% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 27 functions across 4 files. (1 skipped: 1 …
Linked Issues check		Check skipped because no linked issues were found for this pull request.
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             $0.0036 · 280,299 in / 19,620 out · 27,840 cached (10%) · gpt-5.6-luna, glm-5.3-flash
critique:    $0.0023 · 176,313 in / 11,954 out · 19,283 cached (11%) · gpt-5.6-luna, glm-5.3-flash
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             $0.0046 · 315,386 in / 32,735 out · 27,247 cached (9%)  · gpt-5.6-luna, glm-5.3-flash
critique:    $0.0021 · 140,791 in / 13,890 out · 11,680 cached (8%)  · gpt-5.6-luna, glm-5.3-flash
security:    $0.0020 · 123,840 in / 14,868 out · 12,495 cached (10%) · gpt-5.6-luna
tests:       $0.0001 · 12,479 in  / 1,391 out  · 1,536 cached (12%)  · glm-5.3-flash
description: $0.0001 · 12,476 in  / 711 out    · 1,408 cached (11%)  · glm-5.3-flash

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Inline comments:
Review comments at @crates/tinybus/src/module/host.rs:
- Around line 1988-1992: Update ancestor_label so it does not return usernames
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home directories or use a generic label, ensuring Error::module_refused
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             $0.0204 · 317,654 in / 21,998 out · 20,486 cached (6%) · gpt-5.6-luna, glm-5.3-flash
critique:    $0.0139 · 175,447 in / 15,623 out · 11,679 cached (7%) · gpt-5.6-luna, glm-5.3-flash
security:    $0.0059 · 73,249 in  / 2,879 out  · 7,143 cached (10%) · gpt-5.6-luna
tests:       $0.0001 · 13,941 in  / 800 out    · 1,536 cached (11%) · glm-5.3-flash
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             $0.0119 · 255,380 in / 21,038 out · 54,664 cached (21%) · gpt-5.6-luna, glm-5.3-flash
critique:    $0.0063 · 115,046 in / 10,534 out · 39,120 cached (34%) · gpt-5.6-luna, glm-5.3-flash
security:    $0.0050 · 84,387 in  / 4,508 out  · 15,352 cached (18%) · gpt-5.6-luna
tests:       $0.0002 · 13,317 in  / 2,391 out  · 64 cached (0%)      · glm-5.3-flash
description: $0.0001 · 13,437 in  / 1,313 out  · 64 cached (0%)      · glm-5.3-flash

[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: c9315f6932

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[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: 0a2771039a

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

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If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".

[tinysweeper]

Requesting changes: 2 lane(s) blocking, worst finding is high.

Fix or reply to the findings below and push. The next review clears this automatically once they are gone — you should not need to dismiss anything by hand.

             $0.0102 · 267,672 in / 18,427 out · 58,142 cached (22%) · gpt-5.6-luna, glm-5.3-flash
critique:    $0.0069 · 134,568 in / 10,035 out · 34,922 cached (26%) · gpt-5.6-luna, glm-5.3-flash
security:    $0.0027 · 59,973 in  / 2,904 out  · 23,220 cached (39%) · gpt-5.6-luna
tests:       $0.0001 · 13,981 in  / 1,209 out  · 0 cached (0%)       · glm-5.3-flash
description: $0.0001 · 14,101 in  / 1,722 out  · 0 cached (0%)       · glm-5.3-flash

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 383beee919

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

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If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".

[tinysweeper]

Requesting changes: 2 lane(s) blocking, worst finding is high.

Fix or reply to the findings below and push. The next review clears this automatically once they are gone — you should not need to dismiss anything by hand.

             $0.0163 · 417,681 in / 27,628 out · 147,215 cached (35%) · gpt-5.6-luna, glm-5.3-flash
critique:    $0.0108 · 227,583 in / 13,767 out · 67,188 cached (30%)  · gpt-5.6-luna, glm-5.3-flash
security:    $0.0049 · 131,266 in / 7,909 out  · 80,027 cached (61%)  · gpt-5.6-luna
tests:       $0.0002 · 14,145 in  / 1,939 out  · 0 cached (0%)        · glm-5.3-flash
description: $0.0001 · 14,265 in  / 1,329 out  · 0 cached (0%)        · glm-5.3-flash

[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: 0133ac74e5

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

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[tinysweeper]

Requesting changes: 3 lane(s) blocking, worst finding is critical.

Fix or reply to the findings below and push. The next review clears this automatically once they are gone — you should not need to dismiss anything by hand.

             $0.0185 · 403,256 in / 27,806 out · 55,894 cached (14%) · gpt-5.6-luna, glm-5.3-flash
critique:    $0.0133 · 239,538 in / 15,593 out · 34,209 cached (14%) · gpt-5.6-luna, glm-5.3-flash
security:    $0.0045 · 87,586 in  / 4,548 out  · 21,493 cached (25%) · gpt-5.6-luna
tests:       $0.0002 · 14,661 in  / 2,879 out  · 64 cached (0%)      · glm-5.3-flash
description: $0.0002 · 14,781 in  / 2,196 out  · 64 cached (0%)      · glm-5.3-flash

[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: cd4c0ec5e5

ℹ️ About Codex in GitHub

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[tinysweeper]

Requesting changes: 2 lane(s) blocking, worst finding is medium.

Fix or reply to the findings below and push. The next review clears this automatically once they are gone — you should not need to dismiss anything by hand.

             $0.0220 · 450,035 in / 37,015 out · 58,813 cached (13%) · gpt-5.6-luna, glm-5.3-flash
critique:    $0.0125 · 227,681 in / 15,959 out · 30,163 cached (13%) · gpt-5.6-luna, glm-5.3-flash
security:    $0.0087 · 141,711 in / 10,480 out · 27,114 cached (19%) · gpt-5.6-luna
tests:       $0.0004 · 32,841 in  / 5,461 out  · 1,536 cached (5%)   · glm-5.3-flash
description: $0.0002 · 15,701 in  / 2,227 out  · 0 cached (0%)       · glm-5.3-flash

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 1a570eeb1a

ℹ️ About Codex in GitHub

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[chatgpt-codex-connector]

Reject systemd as a local subid source

On a host configured with subid: systemd, this database-independent allowlist succeeds, after which current_user_private_gid checks only /etc/subgid. For the subid database, any source other than files selects a libsubid_* provider, so a GID delegated by that provider can be absent from /etc/subgid; another account could then map the supposedly private GID and replace a library beneath the admitted group-writable ancestor before dlopen. The fresh evidence after the prior fix is that the final code still applies the passwd/group systemd exception to subid; restrict subid to absent or files only, as described by subgid(5).

AGENTS.md reference: AGENTS.md:L124-L130

Useful? React with 👍 / 👎.

[tinysweeper]

Requesting changes: 2 lane(s) blocking, worst finding is high.

Fix or reply to the findings below and push. The next review clears this automatically once they are gone — you should not need to dismiss anything by hand.

             $0.0187 · 389,895 in / 24,838 out · 53,768 cached (14%) · gpt-5.6-luna, glm-5.3-flash
critique:    $0.0103 · 215,087 in / 12,664 out · 32,230 cached (15%) · gpt-5.6-luna, glm-5.3-flash
security:    $0.0077 · 127,209 in / 5,711 out  · 21,474 cached (17%) · gpt-5.6-luna
tests:       $0.0002 · 15,797 in  / 717 out    · 0 cached (0%)       · glm-5.3-flash
description: $0.0002 · 15,976 in  / 3,629 out  · 64 cached (0%)      · glm-5.3-flash

[tinysweeper]

Reject systemd-backed account databases

This still authorizes a private-group exception when nsswitch.conf contains systemd if the candidate GID is in the chosen range and a fixed set of userdb directories is empty. That does not establish that the systemd NSS backend has no dynamic users or group memberships: records may be supplied by sources or mechanisms not represented by this directory check, and the listed paths can also change after the check. A local passwd/group record therefore can be authorized even though the effective systemd account database contains another account or supplementary membership. Only accept an exclusively local files configuration for this authorization, or obtain a complete authoritative snapshot from the systemd backend.

[RULE] incomplete-account-source-validation ·

[tinysweeper]

Reject systemd as a private-group account source

A configuration such as passwd: files systemd, group: files systemd, and initgroups: files systemd is treated as local and can reach the private-group exception. The later directory check does not prove that the systemd NSS backend has no dynamic users or user records; it only checks a fixed set of on-disk directories. Consequently, a local passwd/group record can be authorized even though systemd can add another account or supplementary membership that makes the group non-private. Only accept files for every account source used by this authorization, or otherwise obtain a complete and authoritative systemd account snapshot.

Suggested change

	.all(|source| matches!(source, "files" | "systemd"));
	.all(|source| matches!(source, "files"));

[RULE] account-source-isolation ·

[tinysweeper]

Resolve the private group for each ancestor

The OnceCell caches the result of reading /etc/passwd and /etc/group for the entire ancestor walk. Those files can change between checks, so a later ancestor can be authorized using a stale primary-group identity—for example, after the current user's primary GID changes, or after the old GID becomes another account's primary group. Resolve the private-group status per ancestor, or take a snapshot whose validity covers the whole walk.

[RULE] stale-authorization-cache ·

[tinysweeper]

Reject systemd-backed account databases for private-group authorization

accounts_are_local still classifies systemd as local. Consequently, current_user_private_gid can authorize the private-group exception when the listed userdb directories are empty, even though an nss-systemd backend may provide dynamic or externally managed user/group records outside those directories. Reject systemd (including its initgroups source) rather than treating it as equivalent to /etc files.

[RULE] untrusted-account-source ·