Bug 1308908 (CVE-2016-2143)

Summary:	CVE-2016-2143 kernel: Fork of large process causes memory corruption
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
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, aquini, arozansk, bhu, dhoward, esammons, fhrbata, hannsj_uhl, iboverma, jkacur, joelsmith, jross, kernel-mgr, kstutsma, lgoncalv, lwang, matt, mcressma, mguzik, nmurray, plougher, pmatouse, ppandit, rvrbovsk, security-response-team, slawomir, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	It was reported that on s390x, the fork of a process with four page table levels will cause memory corruption with a variety of symptoms. All processes are created with three level page table and a limit of 4TB for the address space. If the parent process has four page table levels with a limit of 8PB, the function that duplicates the address space will try to copy memory areas outside of the address space limit for the child process.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-09-05 05:15:34 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:	1308879, 1316461, 1341544, 1341546, 1341547, 1341548
Bug Blocks:	1308909

Description Adam Mariš 2016-02-16 12:36:22 UTC

It was reported that on s390x, the fork of a process with four page table levels will cause memory corruption with a variety of symptoms. All processes are created with three level page table and a limit of 4TB for the address space.  If the parent process has four page table levels with a limit of 8PB, the function that duplicates the address space will try to copy memory areas outside of the address space limit for the child process.

Upstream patch:

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=3446c13b268af86391d06611327006b059b8bab1

Comment 5 Petr Matousek 2016-06-01 09:31:29 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1341544]

Comment 7 errata-xmlrpc 2016-08-02 18:26:57 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2016:1539 https://rhn.redhat.com/errata/RHSA-2016-1539.html

Comment 8 errata-xmlrpc 2016-11-15 19:38:48 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2016:2766 https://rhn.redhat.com/errata/RHSA-2016-2766.html