mbrav / gigachad_kernel_module

A simple Linux Kernel module for Gigachads

Gigachad Kernel module

This is a simple Linux Kernel module. Try it inside a VM. Don't use on your install (unless you are a Gigachad).

All code is free to use. Modifications in editors besides Vim / Neovim are not allowed.

Prerequisites

On Debian-based distros Install:

apt install linux-headers-$(uname -r) gcc make build-essential libncurses-dev exuberant-ctags

Whereas, if you are on Arch, you probably don't even need to install anything because Arch is a Gigachad-teir distro by default.

I use Arch btw.

Building

make

Loading the module into your Kernel

To load the the module, you must install the .ko file. You can do so with the following make command:

sudo make install

Unloading module from your Kernel

To unload the module from your kernel run:

sudo make uninstall

Testing if the module was loaded

To test whether the module run dmesg command to check if the following message are present:

[ 3433.692029] Gigachad Kernel Module loaded!
[ 3442.597728] Gigachad Kernel Module unloaded!

BTF generation error

In case you get a similar error when running make:

Skipping BTF generation for /home/user/linux_mod/gigachad_kernel_module.ko due to unavailability of vmlinux

This is due to unavailability of vmlinux on your system. To remedy this, try installing the following package:

apt install dwarves

Then, check if the vmlinux file is located in /sys/kernel/btf by running:

ls /sys/kernel/btf

If the vmlinux file is present, copy it to the appropriate directory using the following command:

cp /sys/kernel/btf/vmlinux /usr/lib/modules/$(uname -r)/build/

If after running make once again you continue getting the error:

/bin/sh: 1: ./tools/bpf/resolve_btfids/resolve_btfids: not found

See the following solution.

Cleaning

make clean

Other info

• The Linux Kernel Module Programming Guide