Bug 671298

Summary: kernel: acpi: debugfs: fix buffer overflows, double free
Product: [Other] Security Response Reporter: Eugene Teo (Security Response) <eteo>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED NOTABUG QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: bhu, jkacur, lgoncalv, lwang, rt-maint, vkrizan, williams
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Fixed In Version: Doc Type: Bug Fix
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Clone Of: Environment:
Last Closed: 2015-07-29 13:41:10 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:
Bug Depends On: 671299    
Bug Blocks:    

Description Eugene Teo (Security Response) 2011-01-21 03:39:24 UTC 
File position is not controlled, it may lead to overwrites of arbitrary
kernel memory.  Also the code may kfree() the same pointer multiple
times.

http://lkml.org/lkml/2011/1/20/348

Acknowledgements:

Red Hat would like to thank Vasiliy Kulikov of Openwall for reporting this issue.
Comment 2 Eugene Teo (Security Response) 2011-01-21 03:46:13 UTC 
Introduced in a1a541d8 (v2.6.33-rc1).

*ppos cannot be controlled, but we need to make sure that the (1) buf is not accessed out of bounds, and (2) that *ppos + count will not wrap before copying a buffer from the userspace.
Comment 3 Eugene Teo (Security Response) 2011-01-21 03:49:24 UTC 
Statement:

The Linux kernel as shipped with Red Hat Enterprise Linux 4, 5, and 6 are not affected by this issue as they did not backport the upstream commit a1a541d8 that introduced the issue. A future kernel update in Red Hat Enterprise MRG may address this flaw.
Comment 4 John Kacur 2011-04-14 16:29:35 UTC 
commit 2949ad50711cc161721cf788711722eeeca33764 upstream