oss-sec mailing list archives
Re: CVE request: kernel: perf, x86: fix Intel fixed counters base initialization
From: Huzaifa Sidhpurwala <huzaifas () redhat com>
Date: Wed, 06 Jul 2011 11:58:01 +0530
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
Current thread:
- CVE request: kernel: perf, x86: fix Intel fixed counters base initialization Eugene Teo (Jul 05)
- Re: CVE request: kernel: perf, x86: fix Intel fixed counters base initialization Huzaifa Sidhpurwala (Jul 05)