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

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Date:	Fri, 15 Mar 2013 12:32:01 +0000
From:	Damien Lespiau <damien.lespiau@...el.com>
To:	Kees Cook <keescook@...omium.org>
Cc:	Daniel Vetter <daniel.vetter@...ll.ch>,
	Julien Tinnes <jln@...gle.com>,
	David Airlie <airlied@...ux.ie>,
	intel-gfx@...ts.freedesktop.org,
	LKML <linux-kernel@...r.kernel.org>,
	dri-devel@...ts.freedesktop.org
Subject: Re: [Intel-gfx] [PATCH v3] drm/i915: bounds check execbuffer
 relocation count

On Thu, Mar 14, 2013 at 12:32:00PM -0700, Kees Cook wrote:
> On Thu, Mar 14, 2013 at 9:57 AM, Daniel Vetter <daniel.vetter@...ll.ch> wrote:
> > On Wed, Mar 13, 2013 at 9:28 PM, Daniel Vetter <daniel@...ll.ch> wrote:
> >> 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.
> >
> > I've forgotten to dump my wishlist: Can I have an i-g-t for this? For
> > this bug here specifically an execbuf with just one buffer with too
> > many relocs plus another execbuf with two buffers with relocation so
> > that the 2nd relocation list will overflow should be sufficient.
> 
> Sure thing. Where do these live? (Or what docs should I read for
> this?) I'm assuming i-g-t means "intel graphics test"? :)

Close :) GPU Tools. The tests lives in the tests directory of:
http://cgit.freedesktop.org/xorg/app/intel-gpu-tools/

-- 
Damien
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