Bug 1111180 (CVE-2014-4171)

Summary:	CVE-2014-4171 Kernel: mm/shmem: denial of service
Product:	[Other] Security Response	Reporter:	Prasad Pandit <ppandit>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	agordeev, anton, aquini, bhu, chazlett, dhoward, esammons, fhrbata, gansalmon, iboverma, itamar, jforbes, jkacur, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, lgoncalv, lwang, madhu.chinakonda, matt, mchehab, mcressma, npajkovs, pholasek, plougher, rt-maint, rvrbovsk, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	A race condition flaw was found in the way the Linux kernel's mmap(2), madvise(2), and fallocate(2) system calls interacted with each other while operating on virtual memory file system files. A local user could use this flaw to cause a denial of service.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-01-28 20:12:51 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:	1118244, 1118245, 1118246, 1118247
Bug Blocks:	1111112

Description Prasad Pandit 2014-06-19 12:07:33 UTC

Linux kernel built with the shared memory support is vulnerable to a denial of service flaw caused by a race condition in mmap access to a hole, while it is punched from shmem and madvise(2) & fallocate(2) calls. In that mmap access could prevent the other calls from completing.

A user/process could use this flaw to cause a DoS.

Upstream fixes:
-------------
  -> https://git.kernel.org/linus/f00cdc6df7d7cfcabb5b740911e6788cb0802bdb
  -> https://git.kernel.org/linus/8e205f779d1443a94b5ae81aa359cb535dd3021e
  -> https://git.kernel.org/linus/b1a366500bd537b50c3aad26dc7df083ec03a448

Reference:
----------
  -> http://www.openwall.com/lists/oss-security/2014/06/18/11

Comment 1 Prasad Pandit 2014-07-10 09:41:43 UTC

Statement:

This issue does not affect the versions of Linux kernel as shipped with Red Hat Enterprise Linux 5 and Red Hat Enterprise Linux 6.

This issue affects the version of the kernel package as shipped with Red Hat Enterprise Linux 7 and Red Hat Enterprise MRG 2. Future kernel updates for Red Hat Enterprise Linux 7 and Red Hat Enterprise MRG 2 may address this issue.

Comment 4 Prasad Pandit 2014-07-10 09:44:16 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1118247]

Comment 9 Fedora Update System 2014-08-01 06:02:41 UTC

kernel-3.15.7-200.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 10 Fedora Update System 2014-08-08 08:41:48 UTC

kernel-3.14.15-100.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 12 errata-xmlrpc 2014-09-29 19:41:34 UTC

This issue has been addressed in the following products:

  MRG for RHEL-6 v.2

Via RHSA-2014:1318 https://rhn.redhat.com/errata/RHSA-2014-1318.html

Comment 13 Martin Prpič 2014-09-30 10:48:03 UTC

IssueDescription:

A race condition flaw was found in the way the Linux kernel's mmap(2), madvise(2), and fallocate(2) system calls interacted with each other while operating on virtual memory file system files. A local user could use this flaw to cause a denial of service.

Comment 14 errata-xmlrpc 2015-01-28 19:03:41 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2015:0102 https://rhn.redhat.com/errata/RHSA-2015-0102.html