Bug 1308908 (CVE-2016-2143) - CVE-2016-2143 kernel: Fork of large process causes memory corruption
Summary: CVE-2016-2143 kernel: Fork of large process causes memory corruption
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2016-2143
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1308879 1316461 1341544 1341546 1341547 1341548
Blocks: 1308909
TreeView+ depends on / blocked
 
Reported: 2016-02-16 12:36 UTC by Adam Mariš
Modified: 2019-09-29 13:44 UTC (History)
27 users (show)

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.
Clone Of:
Environment:
Last Closed: 2017-09-05 05:15:34 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2016:1539 0 normal SHIPPED_LIVE Important: kernel security and bug fix update 2016-08-02 22:21:06 UTC
Red Hat Product Errata RHSA-2016:2766 0 normal SHIPPED_LIVE Important: kernel security and bug fix update 2016-11-16 00:36:52 UTC

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
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