linux-kernel - Re: [PATCH v3] drm/i915: bounds check execbuffer relocation count

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Message-ID: <20130313202858.GD1896@bremse>
Date:	Wed, 13 Mar 2013 21:28:58 +0100
From:	Daniel Vetter <daniel@...ll.ch>
To:	Chris Wilson <chris@...is-wilson.co.uk>,
	Kees Cook <keescook@...omium.org>,
	linux-kernel@...r.kernel.org,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	David Airlie <airlied@...ux.ie>,
	dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
	Julien Tinnes <jln@...gle.com>, marcheu@...omium.org
Subject: Re: [PATCH v3] drm/i915: bounds check execbuffer relocation count

On Tue, Mar 12, 2013 at 09:07:46AM +0000, Chris Wilson wrote:
> On Mon, Mar 11, 2013 at 05:31:45PM -0700, Kees Cook wrote:
> > It is possible to wrap the counter used to allocate the buffer for
> > relocation copies. This could lead to heap writing overflows.
> > 
> > CVE-2013-0913
> > 
> > v3: collapse test, improve comment
> > v2: move check into validate_exec_list
> > 
> > Signed-off-by: Kees Cook <keescook@...omium.org>
> > Reported-by: Pinkie Pie
> > Cc: stable@...r.kernel.org
> 
> Looks good to me. The only bikeshed that remains is whether we should
> just collapse the two variables into one, but the current 'max - count'
> is more idiomatic and so preferrable.
> Reviewed-by: Chris Wilson <chris@...is-wilson.co.uk>

Picked up for -fixes, thanks for the patch.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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