Bug 651671 - (CVE-2010-4169) CVE-2010-4169 kernel: perf bug
CVE-2010-4169 kernel: perf bug
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
public=20101109,reported=20101110,sou...
: Security
: 651669 651670 (view as bug list)
Depends On: 651672 651673 651674
Blocks:
  Show dependency treegraph
 
Reported: 2010-11-09 22:58 EST by Eugene Teo (Security Response)
Modified: 2015-07-29 13:47 EDT (History)
14 users (show)

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Doc Type: Bug Fix
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Last Closed: 2015-07-29 09:15:39 EDT
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Description Eugene Teo (Security Response) 2010-11-09 22:58:31 EST
Description of problem:
Upstream commit dab5855 ("perf_counter: Add mmap event hooks to mprotect()") is fundamentally wrong as mprotect_fixup() can free 'vma' due to merging. Fix the problem by moving perf_event_mmap() hook to mprotect_fixup(). In certain scenario, a local, unprivileged user could use this flaw to trigger a denial of service.

Upstream commit:
http://git.kernel.org/linus/63bfd7384b119409685a17d5c58f0b56e5dc03da
Comment 6 Eugene Teo (Security Response) 2010-11-09 23:09:10 EST
*** Bug 651669 has been marked as a duplicate of this bug. ***
Comment 9 Eugene Teo (Security Response) 2010-11-10 02:46:05 EST
*** Bug 651670 has been marked as a duplicate of this bug. ***
Comment 10 Eugene Teo (Security Response) 2010-11-16 01:53:17 EST
Statement:

The Linux kernel as shipped with Red Hat Enterprise Linux 3, 4 and 5 did not backport the upstream commit dab5855 that introduced the issue. Future kernel updates in Red Hat Enterprise Linux 6 and Red Hat Enterprise MRG may address this flaw.
Comment 11 errata-xmlrpc 2010-12-08 14:09:44 EST
This issue has been addressed in following products:

  MRG for RHEL-5

Via RHSA-2010:0958 https://rhn.redhat.com/errata/RHSA-2010-0958.html
Comment 12 errata-xmlrpc 2011-02-22 12:38:36 EST
This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2011:0283 https://rhn.redhat.com/errata/RHSA-2011-0283.html

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