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

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Message-ID: <CAGXu5j+Y9Onie1bC5aW-GUqYKCbLe=Zxx3e+74FmKCE237_mig@mail.gmail.com>
Date:	Thu, 14 Mar 2013 12:32:00 -0700
From:	Kees Cook <keescook@...omium.org>
To:	Daniel Vetter <daniel.vetter@...ll.ch>
Cc:	Chris Wilson <chris@...is-wilson.co.uk>,
	LKML <linux-kernel@...r.kernel.org>,
	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 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"? :)

-Kees

-- 
Kees Cook
Chrome OS Security
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