CVE-2011-2521 - Pre Columbian Symptoms

Description

The x86_assign_hw_event function in arch/x86/kernel/cpu/perf_event.c in the Performance Events subsystem in the Linux kernel before 2.6.39 does not properly calculate counter values which allows local users to cause a denial of service (panic) via the perf program.

Reference

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=fc66c5210ec2539e800e87d7b3a985323c7be96e http://www.openwall.com/lists/oss-security/2011/07/06/4 https://github.com/torvalds/linux/commit/fc66c5210ec2539e800e87d7b3a985323c7be96e http://ftp.osuosl.org/pub/linux/kernel/v2.6/ChangeLog-2.6.39 https://bugzilla.redhat.com/show_bug.cgi?id=719228