Bug 648671 - (CVE-2010-4082) CVE-2010-4082 kernel: drivers/video/via/ioctl.c: reading uninitialized stack memory
CVE-2010-4082 kernel: drivers/video/via/ioctl.c: reading uninitialized stack ...
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
Unspecified Unspecified
low Severity low
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Assigned To: Red Hat Product Security
public=20100915,reported=20101006,sou...
: Security
Depends On: 648717 648718 648719
Blocks:
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Reported: 2010-11-01 17:28 EDT by Petr Matousek
Modified: 2015-07-31 02:34 EDT (History)
10 users (show)

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Doc Type: Bug Fix
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Last Closed: 2013-04-04 19:15:42 EDT
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Description Petr Matousek 2010-11-01 17:28:19 EDT
Description of problem:
The VIAFB_GET_INFO device ioctl allows unprivileged users to read 1968 bytes of uninitialized stack memory, because the "reserved" member of the viafb_ioctl_info struct declared on the stack is not altered or zeroed before being copied back to the user.

Reference:
http://www.openwall.com/lists/oss-security/2010/10/06/6
http://lkml.indiana.edu/hypermail//linux/kernel/1009.1/03392.html

Acknowledgements:

Red Hat would like to thank Dan Rosenberg for reporting this issue.
Comment 2 Petr Matousek 2010-11-02 07:21:45 EDT
Statement:

This issue did not affect the versions of Linux kernel as shipped with Red Hat Enterprise Linux 3, 4, and 5 as they did not include support for VIA UniChrome (Pro) and Chrome9 graphics boards.
Comment 3 Eugene Teo (Security Response) 2010-11-04 03:34:24 EDT
Upstream commit:
http://git.kernel.org/linus/b4aaa78f4c2f9cde2f335b14f4ca30b01f9651ca
Comment 4 Kyle McMartin 2010-11-23 12:11:03 EST
Already in stable {32,35,36}.
Comment 5 Kyle McMartin 2010-11-23 12:16:07 EST
Oop, need it for F-13. Thanks!
Comment 6 errata-xmlrpc 2010-12-08 14:10:09 EST
This issue has been addressed in following products:

  MRG for RHEL-5

Via RHSA-2010:0958 https://rhn.redhat.com/errata/RHSA-2010-0958.html
Comment 7 errata-xmlrpc 2011-01-11 14:46:41 EST
This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2011:0007 https://rhn.redhat.com/errata/RHSA-2011-0007.html

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