Linux Kernel Driver

Linux Kernel Driver

This document demonstrates how to make and hack a simple Linux kernel module, a character device driver for example.

1. How to write a Linux character device driver

2. Build

obj-m += sample.o // name of your driver

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

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

3. Linux Kernel Driver Hacking

4. Troubleshoot

4.1. Variable has incomplete type 'struct file_operations'

Did you forget

#include <linux/fs.h>

?

5. References

Elixir Bootin y’all know it is fantastic linux code explorer. But if you want to know which headers should be included to use the functions, you can search them at Elixir Bootin. It will tell you which header has its definition.

6. See Also