Bug 721283 (CVE-2011-2693)
| Summary: | CVE-2011-2693 kernel: panic with NMI enabled while using perf | ||
|---|---|---|---|
| Product: | [Other] Security Response | Reporter: | Eugene Teo (Security Response) <eteo> |
| Component: | vulnerability | Assignee: | Red Hat Product Security <security-response-team> |
| Status: | CLOSED DUPLICATE | QA Contact: | |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | unspecified | CC: | anton, arozansk, bhu, cebbert, davej, dhoward, dzickus, fhrbata, james.leddy, jkacur, jolsa, kernel-mgr, kmcmartin, lgoncalv, lwang, phan, plougher, pmatouse, pzijlstr, rt-maint, security-response-team, sforsber, streeter, vgoyal, williams |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2011-09-06 18:42:43 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | 721293, 721294, 722369 | ||
| Bug Blocks: | 721190 | ||
Upstream commit: http://git.kernel.org/linus/fc66c5210ec2539e800e87d7b3a985323c7be96e *** This bug has been marked as a duplicate of bug 719228 *** (In reply to comment #24) > > *** This bug has been marked as a duplicate of bug 719228 *** It was found to be the same issue as CVE-2011-2521. CVE-2011-2693 is rejected. Statement: This flaw was found to be a duplicate of CVE-2011-2521. Please see https://access.redhat.com/security/cve/CVE-2011-2521 for information about affected products and security errata. |
Kernel panic when using perf and nmi_watchdog together. 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. Without: $ task -e unhalted_core_cycles -e instructions_retired -e baclears noploop 1 noploop for 1 seconds 242202299 unhalted_core_cycles (0.00% scaling, ena=1000790892, run=1000790892) 2389685946 instructions_retired (0.00% scaling, ena=1000790892, run=1000790892) 49473 baclears (0.00% scaling, ena=1000790892, run=1000790892) With: $ task -e unhalted_core_cycles -e instructions_retired -e baclears noploop 1 noploop for 1 seconds 2392703238 unhalted_core_cycles (0.00% scaling, ena=1000840809, run=1000840809) 2389793744 instructions_retired (0.00% scaling, ena=1000840809, run=1000840809) 47863 baclears (0.00% scaling, ena=1000840809, run=1000840809) Upstream commit: http://git.kernel.org/linus/fc66c5210ec2539e800e87d7b3a985323c7be96e