Bug 870101 (CVE-2012-4537)

Summary: CVE-2012-4537 kernel: xen: Memory mapping failure can crash Xen
Product: [Other] Security Response Reporter: Petr Matousek <pmatouse>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: agordeev, anton, arozansk, dhoward, drjones, imammedo, lersek, lwang, mrezanin, pbonzini, plougher, rvrbovsk, security-response-team, sforsber, tburke, xen-maint
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
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Clone Of: Environment:
Last Closed: 2013-04-15 14:28:10 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 870148, 870149, 876203    
Bug Blocks: 870154    

Description Petr Matousek 2012-10-25 14:41:40 UTC 
When set_p2m_entry fails, Xen's internal data structures (the p2m and m2p tables) can get out of sync. This failure can be triggered by unusual guest behaviour exhausting the memory reserved for the p2m table. If it happens, subsequent guest-invoked memory operations can cause Xen to fail an assertion and crash.

A malicious HVM guest administrator might be able to cause Xen to crash.


Acknowledgements:

Red Hat would like to thank the Xen project for reporting this issue.
Comment 3 Petr Matousek 2012-10-25 16:19:06 UTC 
Statement:

This issue did 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 12 Petr Matousek 2012-11-13 14:45:59 UTC 
Created xen tracking bugs for this issue

Affects: fedora-all [bug 876203]
Comment 13 Fedora Update System 2012-11-23 02:55:26 UTC 
xen-4.1.3-4.fc16 has been pushed to the Fedora 16 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 14 Fedora Update System 2012-11-23 02:59:06 UTC 
xen-4.1.3-6.fc17 has been pushed to the Fedora 17 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 15 Fedora Update System 2012-11-23 07:20:37 UTC 
xen-4.2.0-4.fc18 has been pushed to the Fedora 18 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 16 errata-xmlrpc 2012-12-04 20:53:40 UTC 
This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2012:1540 https://rhn.redhat.com/errata/RHSA-2012-1540.html