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

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Message-Id: <B6B08A4C-2FEA-4C08-AB2F-4A99FB8D3786@gmail.com>
Date:	Fri, 6 Apr 2012 09:46:46 -0400
From:	Xi Wang <xi.wang@...il.com>
To:	Chris Wilson <chris@...is-wilson.co.uk>
Cc:	Keith Packard <keithp@...thp.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH 1/2] drm/i915: fix integer overflow in i915_gem_execbuffer2()

On Apr 6, 2012, at 9:36 AM, Chris Wilson wrote:

> On Fri,  6 Apr 2012 08:58:18 -0400, Xi Wang <xi.wang@...il.com> wrote:
>> A large args->buffer_count from userspace may overflow the allocation
>> size, leading to out-of-bounds access.
>> 
>> Use kmalloc_array() to avoid that.
> 
> I can safely say that exec list larger than 4GiB is going to be an
> illegal operation and would rather the ioctl failed outright with
> EINVAL.

On 32-bit platform?

- xi
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