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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!!!
``


Everything is built from source and easily modifiable, powered by Buildroot