Bug 698998 - (CVE-2011-1746) CVE-2011-1746 kernel: agp: insufficient page_count parameter checking in agp_allocate_memory()
CVE-2011-1746 kernel: agp: insufficient page_count parameter checking in agp_...
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
high Severity high
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Assigned To: Red Hat Product Security
public=20110414,reported=20110421,sou...
: Security
Depends On: 699009 699010 699011 699305 699306
Blocks:
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Reported: 2011-04-22 11:19 EDT by Petr Matousek
Modified: 2015-07-31 02:39 EDT (History)
11 users (show)

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Doc Type: Bug Fix
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Last Closed: 2015-07-29 08:41:31 EDT
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RHEL 7.3 requirements from Atomic Host:


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Description Petr Matousek 2011-04-22 11:19:13 EDT
page_count is copied from userspace.  agp_allocate_memory() tries to
check whether this number is too big, but doesn't take into account the
wrap case.  Also agp_create_user_memory() doesn't check whether
alloc_size is calculated from num_agp_pages variable without overflow.
This may lead to allocation of too small buffer with following buffer
overflow.

Reference and patch:
https://lkml.org/lkml/2011/4/14/294
Comment 4 Eugene Teo (Security Response) 2011-04-24 22:27:38 EDT
Upstream commit:
http://git.kernel.org/linus/b522f02184b413955f3bc952e3776ce41edc6355
Comment 5 Eugene Teo (Security Response) 2011-04-24 22:32:39 EDT
Statement:

This issue affects the versions of Linux kernel as shipped with Red Hat Enterprise 4, 5, 6, and Red Hat Enterprise MRG. This has been addressed in Red Hat Enterprise Linux 5, 6, and Red Hat Enterprise MRG via https://rhn.redhat.com/errata/RHSA-2011-0927.html, https://rhn.redhat.com/errata/RHSA-2011-1350.html, and https://rhn.redhat.com/errata/RHSA-2011-1253.html. Red Hat Enterprise Linux 4 is now in Production 3 of the maintenance life-cycle, https://access.redhat.com/support/policy/updates/errata/, therefore the fix for this issue is not currently planned to be included in the future updates.
Comment 6 errata-xmlrpc 2011-07-15 02:08:49 EDT
This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2011:0927 https://rhn.redhat.com/errata/RHSA-2011-0927.html
Comment 8 Vincent Danen 2011-09-12 14:40:48 EDT
Acknowledgements:

Red Hat would like to thank Vasiliy Kulikov of Openwall for reporting this issue.
Comment 9 errata-xmlrpc 2011-09-12 15:44:24 EDT
This issue has been addressed in following products:

  MRG for RHEL-6 v.2

Via RHSA-2011:1253 https://rhn.redhat.com/errata/RHSA-2011-1253.html
Comment 10 errata-xmlrpc 2011-10-05 17:47:30 EDT
This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2011:1350 https://rhn.redhat.com/errata/RHSA-2011-1350.html

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