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Bug 1384851 - (CVE-2016-8660) CVE-2016-8660 kernel: xfs: local DoS due to a page lock order bug in the XFS seek hole/data implementation
CVE-2016-8660 kernel: xfs: local DoS due to a page lock order bug in the XFS ...
Status: CLOSED NOTABUG
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
low Severity low
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Assigned To: Red Hat Product Security
impact=low,public=20161013,reported=2...
: Security
Depends On: 1384852
Blocks: 1384853
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Reported: 2016-10-14 05:30 EDT by Andrej Nemec
Modified: 2018-02-26 07:18 EST (History)
37 users (show)

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Doc Text:
The XFS subsystem in the Linux kernel 4.4 and later allows local users to cause a denial of service (fdatasync() failure and system hang) by using the vfs syscall group in the 'trinity' program, as a result of a page lock order bug in the XFS seek hole/data implementation.
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Last Closed: 2016-11-02 13:50:24 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Andrej Nemec 2016-10-14 05:30:19 EDT 
The XFS subsystem in the Linux kernel 4.4 and later allows local users to cause a denial of service (fdatasync failure and system hang) by using the vfs syscall group in the 'trinity' program, as a result of a page lock order bug in the XFS seek hole/data implementation.

References:

http://seclists.org/oss-sec/2016/q4/118

Introducing commit:

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=fc0561cefc04e7803c0f6501ca4f310a502f65b8

Conditions:

Per the reporter, the 'trinity' program should be run in a container on xfs filesystem as a storage, for example with 'docker' with 'overlay2' or 'devicemapper' with LVM thin pool as a storage engine.

http://www.spinics.net/lists/linux-xfs/msg01365.html

http://www.spinics.net/lists/linux-xfs/msg01372.html
Comment 1 Andrej Nemec 2016-10-14 05:31:08 EDT 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1384852]
Comment 4 Vladis Dronov 2016-11-02 13:38:17 EDT 
Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6, 7 and MRG-2 as the code with the flaw is not present in the products listed.
Comment 5 Salvatore Bonaccorso 2018-02-25 11:21:26 EST 
Hi

Any idea if this issue has been fixed upstream? If so where?

Regards,
Salvatore
Comment 7 Vladis Dronov 2018-02-26 07:11:10 EST 
hello, Salvatore,

unfortunately, we are not aware of such a fix.

i've searched upstream's git-log for something like "Fixes: fc0561ce" or "CVE-2016-8660" but unfortunately/expectedly have not found anything.

http://seclists.org/oss-sec/2016/q4/118 says:

> This had also been reported to the XFS maintainer and diagnosed as
> a page lock order bug in the XFS seek hole/data implementation and
> presumably is still working on a fix better than to revert the above commit.

so i guess this thread is a proper place to check. unfortunately, i cannot find any message mentioning "fc0561cef" in linux-xfs@.
Comment 8 Vladis Dronov 2018-02-26 07:18:50 EST 
hello, Salvatore,

(god bless marc.info) the thread in question is:

https://marc.info/?t=147560293400001&r=1&w=2

or:

https://www.spinics.net/lists/linux-xfs/msg01367.html

https://www.spinics.net/lists/linux-xfs/msg01365.html
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