Even if that is the case for whatever legal reason just because they don't accept patches from PaX directly doesn't mean they can't provide their own implementations.

For example, PaX was the first person to implement ASLR for Linux... and that was adopted into the Linux Kernel many years later (as well as by Windows, OSX, and other BSDs). https://en.wikipedia.org/wiki/Address_space_layout_randomiza...