= \b[Everything] is built from source and easily modifiable, powered by Buildroot
\Image[https://web.archive.org/web/20240424065053im_/https://bootlin.com/wp-content/uploads/2015/05/logo-buildroot.png]
The following are https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/submodules[stored in submodules]:
``
submodules/binutils-gdb/
submodules/buildroot/
submodules/gcc/
submodules/glibc/
submodules/linux/
submodules/qemu/
``
So you can modify source, rebuild and that's it, its in the VM.
E.g., let's hack the linux kernel:
``
asmlinkage __visible void __init __no_sanitize_address start_kernel(void)
{
pr_info("I'VE HACKED THE LINUX KERNEL!!!");
``
Rebuild Linux:
``
./build-linux
``
Rerun:
``
./run
``
And after boot we see:
``
<6>[ 0.000000] I'VE HACKED THE LINUX KERNEL!!!
``