Bug 648671 (CVE-2010-4082)

Summary: CVE-2010-4082 kernel: drivers/video/via/ioctl.c: reading uninitialized stack memory
Product: [Other] Security Response Reporter: Petr Matousek <pmatouse>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: arozansk, bhu, davej, fhrbata, jkacur, kmcmartin, lgoncalv, lwang, tcallawa, williams
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
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Clone Of: Environment:
Last Closed: 2013-04-04 23:15:42 UTC Type: ---
Regression: --- Mount Type: ---
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Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 648717, 648718, 648719    
Bug Blocks:    

Description Petr Matousek 2010-11-01 21:28:19 UTC 
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 11:21:45 UTC 
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 07:34:24 UTC 
Upstream commit:
http://git.kernel.org/linus/b4aaa78f4c2f9cde2f335b14f4ca30b01f9651ca
Comment 4 Kyle McMartin 2010-11-23 17:11:03 UTC 
Already in stable {32,35,36}.
Comment 5 Kyle McMartin 2010-11-23 17:16:07 UTC 
Oop, need it for F-13. Thanks!
Comment 6 errata-xmlrpc 2010-12-08 19:10:09 UTC 
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 19:46:41 UTC 
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