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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