Bug 1557555 (CVE-2017-18224) - CVE-2017-18224 kernel: race condition due to concurrent access to extent tree in fs/ocfs2/aops.c
Summary: CVE-2017-18224 kernel: race condition due to concurrent access to extent tree...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2017-18224
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: 1557557 1557558
Blocks: 1557559
TreeView+ depends on / blocked
 
Reported: 2018-03-16 21:26 UTC by Laura Pardo
Modified: 2021-02-17 00:37 UTC (History)
37 users (show)

Fixed In Version: kernel 4.16-rc5
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in the Linux kernel that fs/ocfs2/aops.c omits use of a semaphore and consequently has a race condition for access to the extent tree during read operations in DIRECT mode. This allows local users to cause a denial of service by modifying a certain e_cpos field.
Clone Of:
Environment:
Last Closed: 2018-03-18 14:51:41 UTC
Embargoed:

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Description Laura Pardo 2018-03-16 21:26:05 UTC 
A flaw was found in the Linux kernel that fs/ocfs2/aops.c omits use of a semaphore and consequently has a race condition for access to the extent tree during read operations in DIRECT mode, which allows local users to cause a denial of service by modifying a certain e_cpos field.

References:

https://marc.info/?t=150884957800012&r=1&w=2

An upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3e4c56d41eef5595035872a2ec5a483f42e8917f
Comment 1 Laura Pardo 2018-03-16 21:27:35 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1557557]
Comment 3 Justin M. Forbes 2018-03-16 22:36:13 UTC 
This was fixed for Fedora with the 4.15 rebases.
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