[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Date: Tue, 22 May 2012 11:36:04 -0600
From: Kurt Seifried <kseifried@...hat.com>
To: oss-security@...ts.openwall.com
CC: Marcus Meissner <meissner@...e.de>
Subject: Re: CVE Request: some drm overflow checks
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
On 05/21/2012 12:38 AM, Marcus Meissner wrote:
> Hi,
>
> spotted in xorls blog, who spotted it in the kernel stable
> changelog:
> https://xorl.wordpress.com/2012/05/17/linux-kernel-drm-intel-i915-multiple-ioctl-integer-overflows/
>
> It has two issues:
>
> 1. overflow of cliprect kmalloc as args->num_cliprects is not
> bounded and passed in via a user ioctl.
>
> Fixed via ed8cd3b2cd61004cab85380c52b1817aca1ca49b in mainline:
> commit ed8cd3b2cd61004cab85380c52b1817aca1ca49b Author: Xi Wang
> <xi.wang@...il.com> Date: Mon Apr 23 04:06:41 2012 -0400
>
> drm/i915: fix integer overflow in i915_gem_execbuffer2()
>
> 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").
>
>
> 8408c282 was added Feb 21 2011, and seemingly added during 2.6.38
> development.
drm/i915: fix integer overflow in i915_gem_execbuffer2()
Please use CVE-2012-2383 for this issue.
> 2. same file, overflow in args->buffer_count.
>
> Fix is in mainline 44afb3a04391a74309d16180d1e4f8386fdfa745
>
> commit 44afb3a04391a74309d16180d1e4f8386fdfa745 Author: Xi Wang
> <xi.wang@...il.com> Date: Mon Apr 23 04:06:42 2012 -0400
>
> drm/i915: fix integer overflow in i915_gem_do_execbuffer()
>
> On 32-bit systems, a large args->num_cliprects from userspace via
> ioctl may overflow the allocation size, leading to out-of-bounds
> access.
>
> This vulnerability was introduced in commit 432e58ed ("drm/i915:
> Avoid allocation for execbuffer object list").
>
>
> 432e58ed was added during 2.6.37 development.
drm/i915: fix integer overflow in i915_gem_do_execbuffer()
Please use CVE-2012-2384 for this issue.
> I think it needs 2 CVEs, due to the different kernel versions
> introducing it.
Agreed.
> Ciao, Marcus
- --
Kurt Seifried Red Hat Security Response Team (SRT)
PGP: 0x5E267993 A90B F995 7350 148F 66BF 7554 160D 4553 5E26 7993
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.12 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/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=RD91
-----END PGP SIGNATURE-----
Powered by blists - more mailing lists
Please check out the
Open Source Software Security Wiki, which is counterpart to this
mailing list.
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
