Re: [PATCH 07/34] x86/entry/32: Restore segments before int registers

Linus Torvalds writes: (Summary) wrote:

[...]

previous versions which was return to user with kernel-cr3 :) Ahh. The NX protection to guarantee that you don't return to user mode was really good on x86-64.
return to user mode was really good on x86-64.
So some other case could slip through, because user code can happily run with the kernel page tables.
run with the kernel page tables.

[...]

for the kernel-cr3.
Does not NX work with PAE?
Does not NX work with PAE?
Oh, it looks like the NX bit is marked as "RSVD (must be 0)" in the PDPDT.