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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1333720475_271533@CP5-2952>
Date:	Fri, 06 Apr 2012 14:54:05 +0100
From:	Chris Wilson <chris@...is-wilson.co.uk>
To:	Xi Wang <xi.wang@...il.com>
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 Fri, 6 Apr 2012 09:46:46 -0400, Xi Wang <xi.wang@...il.com> wrote:
> 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?

On any platform. The largest it can legally be is a few tens of megabytes.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/