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Date: Wed, 06 Jul 2011 11:58:01 +0530
From: Huzaifa Sidhpurwala <huzaifas@...hat.com>
To: oss-security@...ts.openwall.com
Subject: Re: CVE request: kernel: perf, x86: fix Intel fixed
counters base initialization
On 07/06/2011 11:54 AM, Eugene Teo wrote:
> The following patch solves the problems introduced by Robert's commit
> 41bf498 and reported by Arun Sharma. This commit gets rid of the base +
> index notation for reading and writing PMU msrs.
>
> The problem is that for fixed counters, the new calculation for the base
> did not take into account the fixed counter indexes, thus all fixed
> counters were read/written from fixed counter 0. Although all fixed
> counters share the same config MSR, they each have their own counter
> register.
>
> This can cause a local denial of service.
>
> Upstream commit:
> http://git.kernel.org/linus/fc66c5210ec2539e800e87d7b3a985323c7be96e
>
> Introduced in:
> http://git.kernel.org/linus/41bf498949a263fa0b2d32524b89d696ac330e94
>
> Reference:
> https://bugzilla.redhat.com/show_bug.cgi?id=719228
>
> Thanks, Eugene
Please use CVE-2011-2521
--
Huzaifa Sidhpurwala / Red Hat Security Response Team
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