From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
From: Chris Wilson <chris@chris-wilson.co.uk>
Subject: Re: [PATCH v2 1/2] drm/i915: fix integer overflow in i915_gem_execbuffer2()
To: Xi Wang <xi.wang@gmail.com>,
	Daniel Vetter <daniel.vetter@ffwll.ch>,
	Keith Packard <keithp@keithp.com>
Cc: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
	linux-kernel@vger.kernel.org, security@kernel.org,
	Xi Wang <xi.wang@gmail.com>, stable@vger.kernel.org
In-Reply-To: <1335168402-25174-1-git-send-email-xi.wang@gmail.com>
References: <1335168402-25174-1-git-send-email-xi.wang@gmail.com>
Date: Mon, 23 Apr 2012 09:18:25 +0100
Message-ID: <1335169134_26001@CP5-2952>
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <stable.vger.kernel.org>

On Mon, 23 Apr 2012 04:06:41 -0400, Xi Wang <xi.wang@gmail.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@gmail.com>
> Cc: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: stable@vger.kernel.org
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre