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Bug 1550818 - (CVE-2017-18204) CVE-2017-18204 kernel: Deadlock caused in fs/ocfs2/file.c:ocfs2_setattr() can allow local users to cause a denial of service
CVE-2017-18204 kernel: Deadlock caused in fs/ocfs2/file.c:ocfs2_setattr() can...
Status: CLOSED NOTABUG
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20171115,repor...
: Security
Depends On: 1551505
Blocks: 1550819
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Reported: 2018-03-02 00:23 EST by Sam Fowler
Modified: 2018-03-13 11:15 EDT (History)
27 users (show)

See Also:
Fixed In Version: kernel 4.14.2
Doc Type: If docs needed, set a value
Doc Text:
The Linux kernel, before version 4.14.2, is vulnerable to a deadlock caused by fs/ocfs2/file.c:ocfs2_setattr(), as the function does not wait for DIO requests before locking the inode. This can be exploited by local users to cause a subsequent denial of service.
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Clone Of:
Environment:
Last Closed: 2018-03-05 05:18:37 EST
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CRM:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Sam Fowler 2018-03-02 00:23:25 EST 
The Linux kernel before version 4.14.2 is vulnerable to a deadlock caused by fs/ocfs2/file.c:ocfs2_setattr(), as the function does not wait for DIO requests before locking the inode. This can be exploited by local users to cause a subsequent denial of service.

References:

https://marc.info/?t=150943101800001&r=1&w=2

An upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=28f5a8a7c033cbf3e32277f4cc9c6afd74f05300
Comment 3 Vladis Dronov 2018-03-05 05:12:30 EST 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1551505]
Comment 4 Vladis Dronov 2018-03-05 05:18:37 EST 
Statement:

This issue does not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 5, 6, 7, its real-time kernel, Red Hat Enterprise MRG 2, Red Hat Enterprise Linux 7 for ARM 64 and Red Hat Enterprise Linux 7 for Power 9 LE, as the code with the flaw is not built and shipped in the products listed.
Comment 5 Justin M. Forbes 2018-03-05 07:37:30 EST 
This was fixed for Fedora with the 4.14.2 stable updates.
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