[murderfs]

All of this is in userspace.

[pjmlp]

Yes, most Android subsystems since Project Treble are in userspace.

Hence my doubts, what makes Android Linux isn't on the Linux kernel.

Also I am not sure if everything related to Binder, gralloc and SurfaceFlinger are part of upstream contributions.

Then there are the ebpf customizations, different SELinux and secccomp settings, among others.