Posts tagged hellowor

Linux Kernel: hello world
posted on 2016-03-12 17:26

intro

Easiest this is done via kernel modules. (TBH I don't know if it is possible otherwise in a feasible way, besides building a completely new kernel?)

So for this you should know how to handle kernel modules:

  • lsmod = show loaded kernel modules

  • insmod <module> = load kernel module

  • rmmod <module> = unload kernel module

  • modprobe <module> = load kernel module and, if needed, its dependencies

  • modprobe -r <module> = unload kernel module and unneded dependencies

This guide is debian-specific

prerequisites

#install build environment
apt install build-essential

# look up your kernel version
uname -a 
apt search linux-headers | grep headers
apt install linux-headers-<YOUR_VERSION_HERE>
mkdir /lib/modules/$(uname -r)/build/

actual module

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