Bug 824345 (CVE-2012-2390)

Summary:	CVE-2012-2390 kernel: huge pages: memory leak on mmap failure
Product:	[Other] Security Response	Reporter:	Petr Matousek <pmatouse>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	anton, arozansk, bhu, dhoward, fhrbata, jackkim, jkacur, kernel-mgr, lgoncalv, lwang, mmilgram, mrg-program-list, security-response-team, sforsber, williams
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:	2013-08-24 12:45:29 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:	824350, 824351, 824352, 824353, 824354
Bug Blocks:	824358

Description Petr Matousek 2012-05-23 10:18:19 UTC

Description of problem:
When called for anonymous (non-shared) mappings, hugetlb_reserve_pages() does a resv_map_alloc().  It depends on code in hugetlbfs's vm_ops->close() to release that allocation.

However, in the mmap() failure path, we do a plain unmap_region() without the remove_vma() which actually calls vm_ops->close(). 

An unprivileged local user could use this flaw to crash the system.

References:
http://www.spinics.net/lists/linux-mm/msg34763.html

Proposed upstream fix:
https://lkml.org/lkml/2012/5/21/385

Comment 3 Petr Matousek 2012-05-23 10:24:08 UTC

Created kernel tracking bugs for this issue

Affects: fedora-all [bug 824352]

Comment 4 Kurt Seifried 2012-05-23 18:05:10 UTC

Added CVE as per http://www.openwall.com/lists/oss-security/2012/05/23/14

Comment 5 Petr Matousek 2012-05-30 11:01:45 UTC

Upstream commits:
 c50ac050811d6485616a193eb0f37bfbd191cc89
 4523e1458566a0e8ecfaff90f380dd23acc44d27

Comment 9 Fedora Update System 2012-06-07 02:33:21 UTC

kernel-3.4.0-1.fc17 has been pushed to the Fedora 17 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 10 Fedora Update System 2012-06-13 21:30:08 UTC

kernel-3.3.8-1.fc16 has been pushed to the Fedora 16 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 11 Fedora Update System 2012-06-22 08:37:59 UTC

kernel-2.6.43.8-1.fc15 has been pushed to the Fedora 15 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 12 Petr Matousek 2012-07-04 05:30:12 UTC

Statement:

This issue did not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 5 as they did not include the upstream commit 84afd99b that introduced this issue. Future kernel updates for Red Hat Enterprise Linux 6 may address this issue.

This has been addressed in Red Hat Enterprise Linux Red Hat Enterprise MRG 2 via https://rhn.redhat.com/errata/RHSA-2012-1150.html

Comment 13 errata-xmlrpc 2012-08-08 16:35:17 UTC

This issue has been addressed in following products:

  MRG for RHEL-6 v.2

Via RHSA-2012:1150 https://rhn.redhat.com/errata/RHSA-2012-1150.html

Comment 14 errata-xmlrpc 2012-09-25 18:59:58 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2012:1304 https://rhn.redhat.com/errata/RHSA-2012-1304.html