Bug 698999 – CVE-2011-1747 kernel: agp: possible kernel mem exhaustion via AGPIOC_RESERVE and AGPIOC_ALLOCATE ioctls

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Bug 698999 - (CVE-2011-1747) CVE-2011-1747 kernel: agp: possible kernel mem exhaustion via AGPIOC_RESERVE and AGPIOC_ALLOCATE ioctls

Summary:	CVE-2011-1747 kernel: agp: possible kernel mem exhaustion via AGPIOC_RESERVE ...

Status:	CLOSED NOTABUG

Aliases:	CVE-2011-1747

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	public=20110414,reported=20110421,sou...
Keywords:	Security

Depends On:	699000 699001 699002 699003 699004 761351
Blocks:	823440
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Reported:	2011-04-22 11:21 EDT by Petr Matousek
Modified:	2015-08-19 05:09 EDT (History)
CC List:	12 users (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2012-05-23 10:30:16 EDT
Type:	---
Regression:	---
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Documentation:	---
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oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
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Description Petr Matousek 2011-04-22 11:21:43 EDT

There is a problem in agp code - kernel memory exhaustion (AGPIOC_RESERVE and
AGPIOC_ALLOCATE ioctls).  It is not checked whether requested pid is a pid of
the caller (no check in agpioc_reserve_wrap()). Each allocation is limited to
16KB, though, there is no per-process limit. This might lead to OOM situation,
which is not even solved in case of the caller death by OOM killer - the memory
is allocated for another (faked) process.

Reference:
https://lkml.org/lkml/2011/4/14/294

Acknowledgements:                                                                
 
Red Hat would like to thank Vasiliy Kulikov of Openwall for reporting this issue.

Comment 3 Eugene Teo (Security Response) 2011-04-24 22:36:38 EDT

This issue was mentioned in https://lkml.org/lkml/2011/4/14/294 and linux-2.6:b522f02184b413955f3bc952e3776ce41edc6355 for the patch fixing CVE-2011-1746 because the patch tries to fix a similar problem - OOM.

CVE-2011-1747 is not fixed yet.

Comment 15 Petr Matousek 2012-05-23 10:33:00 EDT

Statement:

Red Hat Security Response team does not consider this bug to be security relevant one due to the privileges (CAP_SYS_RAWIO) required to exploit this issue.

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