Bug 678209 (CVE-2011-0999)

Summary:	CVE-2011-0999 kernel: thp: prevent hugepages during args/env copying into the user stack
Product:	[Other] Security Response	Reporter:	Eugene Teo (Security Response) <eteo>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	arozansk, dhoward, kernel-mgr, kmcmartin, lwang, security-response-team, tcallawa, vkrizan
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-07-29 13:53:25 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	674147, 678212, 678213
Bug Blocks:

Description Eugene Teo (Security Response) 2011-02-17 06:44:34 UTC

Transparent hugepages can only be created if rmap is fully functional. A specially crafted binary could allow the user stack to grow huge and backed by hugepages without this patch while is_vma_temporary_stack() is true.

This also optmizes away some harmless but unnecessary setting of khugepaged_scan.address and it switches some BUG_ON to VM_BUG_ON.

Comment 2 Eugene Teo (Security Response) 2011-02-17 06:48:31 UTC

Upstream commit:
http://git.kernel.org/linus/a7d6e4ecdb7648478ddec76d30d87d03d6e22b31

Comment 5 errata-xmlrpc 2011-05-19 11:58:39 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2011:0542 https://rhn.redhat.com/errata/RHSA-2011-0542.html

Comment 7 errata-xmlrpc 2011-06-21 23:53:09 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 6.0.Z - Server Only

Via RHSA-2011:0883 https://rhn.redhat.com/errata/RHSA-2011-0883.html

Comment 8 Eugene Teo (Security Response) 2011-06-29 01:41:14 UTC

Statement:

This issue only affects Red Hat Enterprise Linux 6. The version of Linux kernel as shipped with Red Hat Enterprise Linux 4, 5, and Red Hat Enterprise MRG as they did not include upstream commit 71e3aac0 that introduced the problem. We have addressed this in Red Hat Enterprise Linux 6 via https://rhn.redhat.com/errata/RHSA-2011-0542.html.