linux-kernel - Re: [PATCH] x86: Enable full randomization on i386 and X86

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Message-ID: <CAGXu5j+ZduNvorq5xW5J_NWzN6XQG16Q6_ir5JS1TOfeoFqaMg@mail.gmail.com>
Date:	Thu, 10 Mar 2016 13:05:26 -0800
From:	Kees Cook <keescook@...omium.org>
To:	Arjan van de Ven <arjan@...ux.intel.com>,
	Ingo Molnar <mingo@...hat.com>
Cc:	Hector Marco-Gisbert <hecmargi@....es>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"x86@...nel.org" <x86@...nel.org>,
	Ismael Ripoll Ripoll <iripoll@....es>,
	Harvey Harrison <harvey.harrison@...il.com>
Subject: Re: [PATCH] x86: Enable full randomization on i386 and X86_32.

On Thu, Mar 10, 2016 at 12:53 PM, Arjan van de Ven
<arjan@...ux.intel.com> 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

-- 
Kees Cook
Chrome OS & Brillo Security