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Bug 1323577 - (CVE-2015-8839) CVE-2015-8839 kernel: ext4 filesystem page fault race condition with fallocate call.
CVE-2015-8839 kernel: ext4 filesystem page fault race condition with fallocat...
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
: ---
: ---
Assigned To: Red Hat Product Security
impact=moderate,public=20160331,repor...
: Security
Depends On: 1323579 1328705
Blocks: 1323581
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Reported: 2016-04-04 03:28 EDT by Andrej Nemec
Modified: 2018-08-28 18:04 EDT (History)
33 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
A flaw was found in the Linux kernel when attempting to "punch a hole" in files existing on an ext4 filesystem. When punching holes into a file races with the page fault of the same area, it is possible that freed blocks remain referenced from page cache pages mapped to process' address space.
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RHEL 7.3 requirements from Atomic Host:
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External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2017:1842 normal SHIPPED_LIVE Important: kernel security, bug fix, and enhancement update 2017-08-01 14:22:09 EDT
Red Hat Product Errata RHSA-2017:2077 normal SHIPPED_LIVE Important: kernel-rt security, bug fix, and enhancement update 2017-08-01 14:13:37 EDT
Red Hat Product Errata RHSA-2017:2669 normal SHIPPED_LIVE Important: kernel-rt security and bug fix update 2017-09-06 20:36:52 EDT

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Description Andrej Nemec 2016-04-04 03:28:14 EDT 
A flaw was found in the Linux kernel when attempting to "punch a hole" in files existing on an ext4 filesystem. When punching holes into a file races with the page fault of the same area, it is possible that freed blocks remain referenced from page cache pages mapped to process' address space. 

Thus modification of these blocks can corrupt data someone else is now storing in those blocks when at some point those pages are written to disk.

Upstream fixes:

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ea3d7209ca01da209cda6f0dea8be9cc4b7a933b
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=17048e8a083fec7ad841d88ef0812707fbc7e39f
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=32ebffd3bbb4162da5ff88f9a35dd32d0a28ea70
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=011278485ecc3cd2a3954b5d4c73101d919bf1fa

References:

http://seclists.org/oss-sec/2016/q2/1
Comment 1 Andrej Nemec 2016-04-04 03:29:27 EDT 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1323579]
Comment 2 Wade Mealing 2016-04-19 01:11:20 EDT 
Statement:

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

This issue affects the Linux kernels as shipped with Red Hat Enterprise Linux 7 and MRG-2 kernels.
Comment 4 Fedora Update System 2016-04-19 15:23:08 EDT 
kernel-4.4.7-300.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.
Comment 7 Fedora Update System 2016-05-06 15:53:25 EDT 
kernel-4.4.8-200.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.
Comment 8 errata-xmlrpc 2017-08-01 15:08:28 EDT 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:2077 https://access.redhat.com/errata/RHSA-2017:2077
Comment 9 errata-xmlrpc 2017-08-02 03:47:22 EDT 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:1842 https://access.redhat.com/errata/RHSA-2017:1842
Comment 10 errata-xmlrpc 2017-09-06 16:37:33 EDT 
This issue has been addressed in the following products:

  Red Hat Enterprise MRG 2

Via RHSA-2017:2669 https://access.redhat.com/errata/RHSA-2017:2669
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