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Date: Wed, 06 Jul 2011 11:58:01 +0530
From: Huzaifa Sidhpurwala <>
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:
> Introduced in:
> Reference:
> Thanks, Eugene

Please use CVE-2011-2521

Huzaifa Sidhpurwala / Red Hat Security Response Team

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