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Bug 912898 - (CVE-2013-0309) CVE-2013-0309 kernel: mm: thp: pmd_present and PROT_NONE local DoS
CVE-2013-0309 kernel: mm: thp: pmd_present and PROT_NONE local DoS
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
impact=moderate,public=20130219,repor...
: Security
Depends On: 858385
Blocks:
  Show dependency tree / graph
 
Reported: 2013-02-19 18:53 EST by Petr Matousek
Modified: 2015-07-31 07:35 EDT (History)
27 users (show)

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Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2013-05-08 14:41:27 EDT
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RHEL 7.3 requirements from Atomic Host:
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External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2013:0496 normal SHIPPED_LIVE Important: Red Hat Enterprise Linux 6 kernel update 2013-02-20 16:40:54 EST

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Description Petr Matousek 2013-02-19 18:53:15 EST 
Most VM places are using pmd_none but a few are still using pmd_present. The meaning is about the same for the pmd. However pmd_present would return the wrong value on PROT_NONE ranges. When the code using pmd_present gets a false negative, the kernel will crash. An unprivileged local user could use this flaw to crash the system.

Upstream fix:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commit;h=027ef6c8
Comment 1 Petr Matousek 2013-02-19 19:49:02 EST 
Statement:

This issue did affect the version of Linux kernel as shipped with Red Hat Enterprise Linux 6.

This issue did not affect the version of Linux kernel as shipped with Red Hat Enterprise Linux 5 and Red Hat Enterprise MRG 2.
Comment 2 errata-xmlrpc 2013-02-21 02:02:34 EST 
This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2013:0496 https://rhn.redhat.com/errata/RHSA-2013-0496.html
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