basic-kernel-module

Simple Linux Kernel Module

This is a simple Linux kernel module that demonstrates basic module initialization and cleanup. When loaded, it logs a message to the kernel log, and when unloaded, it logs another message.

Input

• No input

Output

• When the module is loaded: "Hello, Check Point!"
• When the module is unloaded: "Goodbye, Check Point!"

How to Use

1. Create a Makefile

Create a file named Makefile in the same directory as your module source code (basic_module.c) with the following content:

obj-m += basic_module.o

all:
	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules

clean:
	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean

Note: Replace basic_module.o with the object file name matching your source file if it's different.

2. Compilation

Run the following command to compile the module:

make

This will generate a basic_module.ko file, which is the compiled kernel module.

3. Load and Unload the Module

• To load the module into the kernel:

  sudo insmod basic_module.ko

• To unload the module from the kernel:

  sudo rmmod basic_module

4. Check Kernel Log Messages

To view the messages logged by the module, check the kernel log:

dmesg | tail

You should see the following messages:

• After loading the module:

  Hello, Check Point!
  

• After unloading the module:

  Goodbye, Check Point!