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Issue 833356 link

Starred by 1 user
Status: WontFix
Owner:
zsm@chromium.org
Closed: Apr 2018
Cc:
groeck@chromium.org
chromeos-kernel-security-bug-access@google.com
Components:
EstimatedDays: ----
NextAction: ----
OS: Chrome
Pri: 3
Type: Bug-Security



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CVE-2017-18224 CrOS: Vulnerability reported in Linux kernel

Project Member Reported by vomit.go...@appspot.gserviceaccount.com, Apr 16 2018 
VOMIT (go/vomit) has received an external vulnerability report for the Linux kernel. 

Advisory: CVE-2017-18224
  Details: http://vomit.googleplex.com/advisory?id=CVE/CVE-2017-18224
  CVSS severity score: 1.9/10.0
  Description:

In the Linux kernel before 4.15, 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 (BUG) by modifying a certain e_cpos field.



This bug was filed by http://go/vomit
Please contact us at vomit-team@google.com if you need any assistance.

Comment 1 by xzhou@chromium.org, Apr 16 2018

Labels: Security_Severity-Low Security_Impact-None Pri-3
OCFS is a cluster file system and I did not find any usage of this file system on our devices.

Comment 2 by zsm@google.com, Apr 16 2018

Owner: zsm@chromium.org
Status: Assigned (was: Untriaged)

Comment 3 by zsm@chromium.org, Apr 16 2018

Cc: groeck@chromium.org
Status: WontFix (was: Assigned)
The fix is 3e4c56d41("ocfs2: ip_alloc_sem should be taken in ocfs2_get_block()").

The patch is not present in 4.14, 4.4, 3.18, 3.14, 3.10, 3.8.

Marking as WontFix as OCFS is not enabled in chromeos images.
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