Bug 761646 (CVE-2011-4594)

Summary: CVE-2011-4594 kernel: send(m)msg: user pointer dereferences
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, fhrbata, kernel-mgr, lwang, plougher, sforsber, vgoyal
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
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Clone Of: Environment:
Last Closed: 2013-04-05 15:42:47 UTC Type: ---
Regression: --- Mount Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 760798, 761668    
Bug Blocks: 761664    

Description Petr Matousek 2011-12-08 19:11:10 UTC 
Dereferencing a user pointer directly from kernel-space without going through the copy_from_user family of functions is a bad idea. Two of such usages can be found in the sendmsg code path called from sendmmsg, added by upstream commit c71d8ebe7a4496fb7231151cb70a6baa0cb56f9a. Usages are performed through memcmp() and memcpy() directly. 

Upstream fix: http://git.kernel.org/linus/bc909d9ddbf7778371e36a651d6e4194b1cc7d4c

Acknowledgements:                                                               

Red Hat would like to thank Tetsuo Handa for reporting this issue. Upstream acknowledges Mathieu Desnoyers as the original reporter.
Comment 3 Petr Matousek 2011-12-09 13:51:26 UTC 
Statement:

This issue did not affect the versions of Linux kernel as shipped with Red Hat
Enterprise Linux 4, 5 and Red Hat Enterprise MRG as they did not provide support for the sendmmsg syscall. This has been addressed in Red Hat Enterprise Linux 6 via https://rhn.redhat.com/errata/RHSA-2012-0350.html.
Comment 4 errata-xmlrpc 2012-03-06 18:45:15 UTC 
This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2012:0350 https://rhn.redhat.com/errata/RHSA-2012-0350.html