linux-kernel - Re: [PATCH] [RESEND] PIE executable randomization

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Message-ID: <20070815164834.GB7677@outflux.net>
Date:	Wed, 15 Aug 2007 09:48:34 -0700
From:	Kees Cook <kees@...flux.net>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	Jakub Jelinek <jakub@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Roland McGrath <roland@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Ulrich Kunitz <kune@...ne-taler.de>,
	Bret Towe <magnade@...il.com>, linux-kernel@...r.kernel.org,
	Arjan van de Ven <arjan@...radead.org>,
	Andi Kleen <ak@...e.de>
Subject: Re: [PATCH] [RESEND] PIE executable randomization

Hi,

On Wed, Aug 15, 2007 at 01:21:37AM +0200, Jiri Kosina wrote:
> The following patch fixes the brk-allocation problems on x86_64 with code 
> randomization patch on PIE-compiled binaries. Is anyone aware of any 
> potential disaster it might cause somewhere please?

(Adding myself to this thread...)

I've tested this on x86_64 now (the prior patch failed on brk, as
mentioned).  This version passes my regression tests.  I'd like to
double-check this on i386 with unlimited stack (the situation that ran
into problems back with 2.6.20's version of text ASLR).

For anyone interested, I have a few ASLR and VM checking tools here:
http://outflux.net/aslr/

Thanks,

-Kees

-- 
Kees Cook                                            @outflux.net
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