Bug 730341 - (CVE-2011-3131) CVE-2011-3131 kernel: xen: IOMMU fault livelock
CVE-2011-3131 kernel: xen: IOMMU fault livelock
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=20110812,reported=20110812,sou...
: Security
Depends On: 730342 730343
Blocks: 730344
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Reported: 2011-08-12 10:36 EDT by Petr Matousek
Modified: 2015-02-16 10:40 EST (History)
6 users (show)

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Doc Type: Bug Fix
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Last Closed: 2012-05-10 08:58:16 EDT
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Description Petr Matousek 2011-08-12 10:36:11 EDT
A VM that controls a PCI[E] device directly can cause it to issue DMA requests to invalid addresses. Although these requests are denied by the IOMMU, the hypervisor needs to handle the interrupt and clear the error from the IOMMU, and this can be used to live-lock a CPU and potentially hang the host.

A malicious guest administrator of a VM that has direct control of a PCI[E] device can cause a performance degradation, and possibly hang the host.

Upstream patches:
changeset 23762:537ed3b74b3f of xen-unstable.hg
changeset 23112:84e3706df07a of xen-4.1-testing.hg

References:
http://permalink.gmane.org/gmane.comp.emulators.xen.devel/109514
http://lists.xensource.com/archives/html/xen-devel/2011-06/msg01106.html 
http://xenbits.xen.org/hg/staging/xen-unstable.hg/rev/537ed3b74b3f
http://xenbits.xen.org/hg/staging/xen-4.1-testing.hg/rev/84e3706df07a
Comment 2 Petr Matousek 2011-08-12 10:44:20 EDT
Statement:

The versions of the Linux kernel as shipped with Red Hat Enterprise Linux 4, 6,
and Red Hat Enterprise MRG are not affected. It has been addressed in Red Hat Enterprise Linux 5 via https://rhn.redhat.com/errata/RHSA-2011-1386.html.
Comment 3 errata-xmlrpc 2011-10-20 13:28:57 EDT
This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2011:1386 https://rhn.redhat.com/errata/RHSA-2011-1386.html

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