linux-kernel - Re: [PATCH v2 1/2] drm/i915: fix integer overflow in i915_gem

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Message-ID: <1335169134_26001@CP5-2952>
Date:	Mon, 23 Apr 2012 09:18:25 +0100
From:	Chris Wilson <chris@...is-wilson.co.uk>
To:	Xi Wang <xi.wang@...il.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Keith Packard <keithp@...thp.com>
Cc:	intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org, security@...nel.org,
	Xi Wang <xi.wang@...il.com>, stable@...r.kernel.org
Subject: Re: [PATCH v2 1/2] drm/i915: fix integer overflow in i915_gem_execbuffer2()

On Mon, 23 Apr 2012 04:06:41 -0400, Xi Wang <xi.wang@...il.com> wrote:
> On 32-bit systems, a large args->buffer_count from userspace via ioctl
> may overflow the allocation size, leading to out-of-bounds access.
> 
> This vulnerability was introduced in commit 8408c282 ("drm/i915:
> First try a normal large kmalloc for the temporary exec buffers").
> 
> Signed-off-by: Xi Wang <xi.wang@...il.com>
> Cc: Chris Wilson <chris@...is-wilson.co.uk>
> Cc: stable@...r.kernel.org
Reviewed-by: Chris Wilson <chris@...is-wilson.co.uk>
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre
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