Bug 877393 - (CVE-2012-5514) CVE-2012-5514 kernel: xen: Broken error handling in guest_physmap_mark_populate_on_demand()
CVE-2012-5514 kernel: xen: Broken error handling in guest_physmap_mark_popula...
Status: CLOSED NOTABUG
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=20121203,repor...
: Security
Depends On: 883091
Blocks: 877406
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Reported: 2012-11-16 07:14 EST by Petr Matousek
Modified: 2013-08-24 10:03 EDT (History)
6 users (show)

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Doc Type: Bug Fix
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Last Closed: 2013-08-24 10:03:38 EDT
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Description Petr Matousek 2012-11-16 07:14:41 EST
guest_physmap_mark_populate_on_demand(), before carrying out its actual
operation, checks that the subject GFNs are not in use. If that check fails,
the code prints a message and bypasses the gfn_unlock() matching the
gfn_lock() carried out before entering the loop.

A malicious HVM guest administrator can cause Xen to hang.

Acknowledgements:

Red Hat would like to thank the Xen project for reporting this issue.
Comment 3 Petr Matousek 2012-11-16 07:18:30 EST
Statement:

Not vulnerable.

This issue did not affect the versions of the kernel-xen package as shipped with Red Hat Enterprise Linux 5.

This issue did not affect Red Hat Enterprise Linux 6 and Red Hat Enterprise MRG as we did not have support for Xen hypervisor.
Comment 5 Petr Matousek 2012-12-03 13:19:33 EST
Created xen tracking bugs for this issue

Affects: fedora-all [bug 883091]
Comment 6 Fedora Update System 2012-12-13 01:00:49 EST
xen-4.1.3-7.fc17 has been pushed to the Fedora 17 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 7 Fedora Update System 2012-12-15 12:56:14 EST
xen-4.1.3-6.fc16 has been pushed to the Fedora 16 stable repository.  If problems still persist, please make note of it in this bug report.

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