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Issue 842133 link

Starred by 1 user
Status: Duplicate
Merged: issue 839914
Owner:
groeck@chromium.org
Closed: May 2018
Cc:
wonderfly@google.com
edjee@google.com
zsm@chromium.org
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-2017-18257 CrOS: Vulnerability reported in Linux kernel

Project Member Reported by vomit.go...@appspot.gserviceaccount.com, May 11 2018 
VOMIT (go/vomit) has received an external vulnerability report for the Linux kernel. 

Advisory: CVE-2017-18257
  Details: http://vomit.googleplex.com/advisory?id=CVE/CVE-2017-18257
  CVSS severity score: 4.9/10.0
  Description:

The __get_data_block function in fs/f2fs/data.c in the Linux kernel before 4.11 allows local users to cause a denial of service (integer overflow and loop) via crafted use of the open and fallocate system calls with an FS_IOC_FIEMAP ioctl.



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

Comment 1 by mnissler@chromium.org, May 11 2018

Cc: groeck@chromium.org zsm@chromium.org
Labels: Security_Impact-None Security_Severity-Low
Probably something we should pick up on kernels where it applies.

Not terribly important though given that we currently build with CONFIG_F2FS_FS not set except for beaglebone/raspberrypi, neither of which are used in Chrome OS hardware.

Impact-None since no affected shipping products.
Severity-Medium since DoS only and requires local code execution.

Comment 2 by groeck@chromium.org, May 11 2018

Cc: wonderfly@google.com
Labels: Pri-3
Owner: groeck@chromium.org
Status: ExternalDependency (was: Untriaged)
Upstream b86e33075ed1 ("f2fs: fix a dead loop in f2fs_fiemap()"). Per CVE, not an issue in chromeos-4.14. Not yet fixed in older kernels. Will request to be added to upstream stable releases and pick up from there once available.

Comment 3 by wonderfly@google.com, May 11 2018

Cc: edjee@google.com

Comment 4 by groeck@chromium.org, May 18 2018

Mergedinto: 839914
Status: Duplicate (was: ExternalDependency)
Fixed in v4.4.132. Marking as duplicate of merge bug.
Project Member

Comment 5 by sheriffbot@chromium.org, Aug 24

Labels: allpublic
This bug has been closed for more than 14 weeks. Removing security view restrictions.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot
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