Bug 877393 – CVE-2012-5514 kernel: xen: Broken error handling in guest_physmap_mark_populate_on_demand()

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Bug 877393 - (CVE-2012-5514) CVE-2012-5514 kernel: xen: Broken error handling in guest_physmap_mark_populate_on_demand()

Summary:	CVE-2012-5514 kernel: xen: Broken error handling in guest_physmap_mark_popula...

Status:	CLOSED NOTABUG

Aliases:	CVE-2012-5514

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=moderate,public=20121203,repor...
Keywords:	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)
CC List:	6 users (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2013-08-24 10:03:38 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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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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