Bug 681575 - (CVE-2011-1082) CVE-2011-1082 kernel: potential kernel deadlock when creating circular epoll file structures
CVE-2011-1082 kernel: potential kernel deadlock when creating circular epoll ...
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=20110205,reported=20110302,sou...
: Security
Depends On: 681682 681683 681684 681685 681686 681687
Blocks:
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Reported: 2011-03-02 11:06 EST by Petr Matousek
Modified: 2015-07-31 02:38 EDT (History)
8 users (show)

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Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2013-05-06 03:27:45 EDT
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RHEL 7.3 requirements from Atomic Host:


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Description Petr Matousek 2011-03-02 11:06:05 EST
Description of problem:
In several places, an epoll fd can call another file's ->f_op->poll() method
with ep->mtx held. This is in general unsafe, because that other file could
itself be an epoll fd that contains the original epoll fd.

The code defends against this possibility in its own ->poll() method using
ep_call_nested, but there are several other unsafe calls to ->poll elsewhere
that can be made to deadlock. For example, the following simple program causes
the call in ep_insert recursively call the original fd's ->poll, leading to
deadlock


References:
https://lkml.org/lkml/2011/2/5/220
http://seclists.org/oss-sec/2011/q1/337

Upstream commit:
http://git.kernel.org/linus/22bacca48a1755f79b7e0f192ddb9fbb7fc6e64e

Acknowledgements:                                                                                                                                                                            

Red Hat would like to thank Nelson Elhage for reporting this issue.
Comment 4 Eugene Teo (Security Response) 2011-04-11 00:01:45 EDT
Upstream commit:
http://git.kernel.org/linus/22bacca48a1755f79b7e0f192ddb9fbb7fc6e64e
Comment 5 errata-xmlrpc 2011-05-10 13:20:46 EDT
This issue has been addressed in following products:

  MRG for RHEL-5

Via RHSA-2011:0500 https://rhn.redhat.com/errata/RHSA-2011-0500.html
Comment 6 errata-xmlrpc 2011-05-19 07:58:50 EDT
This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2011:0542 https://rhn.redhat.com/errata/RHSA-2011-0542.html
Comment 8 Eugene Teo (Security Response) 2011-06-14 06:58:06 EDT
Statement:

This issue does not affect the Linux kernel as shipped with Red Hat Enterprise Linux 4 and 5. This was addressed in Red Hat Enterprise Linux 6 and Red Hat Enterprise MRG via https://rhn.redhat.com/errata/RHSA-2011-0542.html and https://rhn.redhat.com/errata/RHSA-2011-0500.html.
Comment 9 errata-xmlrpc 2011-06-21 19:53:15 EDT
This issue has been addressed in following products:

  Red Hat Enterprise Linux 6.0.Z - Server Only

Via RHSA-2011:0883 https://rhn.redhat.com/errata/RHSA-2011-0883.html

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