Re: [RFC] x86/mm/KASLR: Remap GDTs at fixed location

[Linus Torvalds]

On Thu, Jan 5, 2017 at 12:18 PM, Andy Lutomirski <luto@xxxxxxxxxx> wrote:
>
> Hmm.  I bet that if we preset the accessed bits in all the segments
> then we don't need it to be writable in general.

I'm not sure that this is architecturally safe.

IIRC, we do mark the IDT read-only - but that one we started doing due
to the f00f bug, so we knew it was ok. I'm not sure you can do the
same with the GDT/LDT.

                   Linus