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Bug 1557555 - (CVE-2017-18224) CVE-2017-18224 kernel: race condition due to concurrent access to extent tree in fs/ocfs2/aops.c
CVE-2017-18224 kernel: race condition due to concurrent access to extent tree...
Status: CLOSED NOTABUG
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=20171115,repor...
: Security
Depends On: 1557557 1557558
Blocks: 1557559
  Show dependency tree / graph
 
Reported: 2018-03-16 17:26 EDT by Laura Pardo
Modified: 2018-03-19 10:03 EDT (History)
37 users (show)

See Also:
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.
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Clone Of:
Environment:
Last Closed: 2018-03-18 10:51:41 EDT
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Regression: ---
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Documentation: ---
CRM:
Verified Versions:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Laura Pardo 2018-03-16 17:26:05 EDT 
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 17:27:35 EDT 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1557557]
Comment 3 Justin M. Forbes 2018-03-16 18:36:13 EDT 
This was fixed for Fedora with the 4.15 rebases.
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