Re: [PATCH] x86: Enable full randomization on i386 and X86_32.

From: Kees Cook
Date: Thu Mar 10 2016 - 16:05:40 EST

On Thu, Mar 10, 2016 at 12:53 PM, Arjan van de Ven
<arjan@xxxxxxxxxxxxxxx> wrote:
>> Arjan, or other folks, can you remember why x86_32 disabled mmap
>> randomization here? There doesn't seem to be a good reason for it that
>> I see.
> for unlimited stack it got really messy with threaded apps.

Seems like it'd only cause problems for really really giant processes?
(I think it's telling that the other 32-bit archs don't disable ASLR
in this case...)

> anyway, I don't mind seeing if this will indeed work, with time running out
> where 32 bit is going extinct... in a few years we just won't have enough
> testing on this kind of change anymore.

Sounds good. Ingo, can you pull this in and we can try it for -next?


Kees Cook
Chrome OS & Brillo Security