Start linux kernel module development!
FreeKernel module development tutorial for beginners
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About Start linux kernel module development!
A beginner-friendly blog tutorial on Linux kernel module development, covering setup using VirtualBox or QEMU with Buildroot, writing a simple kernel module with init/exit functions, creating a Makefile, compiling, loading with insmod, and viewing output via dmesg. Includes code examples and tips for dependencies.
Key Features
Step-by-step setup using VirtualBox or QEMU+Buildroot
Sample kernel module code with init/exit functions
Makefile template for building kernel modules
Instructions for loading/unloading modules with insmod/rmmod
Use of printk and dmesg for debugging
Notes on dependencies and common pitfalls
Pros & Cons
Pros
- Clear, beginner-oriented explanations
- Provides both VirtualBox and QEMU options
- Includes complete code and Makefile examples
- Addresses common setup issues and pitfalls
Cons
- Limited to basic hello-world module; no advanced topics
- Content last updated in 2022; may not cover latest kernel changes
- Assumes some familiarity with Linux command line
Best For
Learning Linux kernel module development from scratchSetting up a safe development environment with virtual machinesCompiling and testing first kernel moduleUnderstanding module loading/unloading and kernel logging
FAQ
What tools do I need to start kernel module development?
A Linux virtual machine (VirtualBox or QEMU with Buildroot), build-essential, linux-headers package, and Git for cloning the recommended buildroot setup.
How do I compile a kernel module?
Create a Makefile with obj-m += lkm_example.o and run make. The Makefile should reference the kernel build directory.
How do I load and unload a kernel module?
Use insmod ko_example.ko to load and rmmod ko_example.ko to unload. Use dmesg to see printk output.