Linux Kernel Programming

All code has been run on a machine with the following settings:

• Ubuntu 22.04
• Linux kernel 6.5
• qemu-system-aarch64 6.2.0
• glibc 2.36

Follow this guide to prepare environment.

Part 1: Add new system call and write a shell

• Add new syscall getcpu
• Write a simple shell and call getcpu

Part 2: Rootkit

• Hide/Unhide rootkit from lsmod
• Hook syscalls execve and reboot
• Protect module list and sys_call_table by mutex

Part 3: Transfer data between user and kernal

• Trasfer data with copy_to_user and copy_from_user
• Use kmalloc to allocate memory at kernel
• Memory should be protected by mutex

Part 4: myfs

• A simple in-mermoy file system

Reference

This project is modified by CSIE5374. I tried to run experiments on ubuntu 22.04 and kernel 6.5.