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Issue 888316 link

Starred by 1 user
Status: WontFix
Owner:
zsm@chromium.org
Closed: Sep 24
Cc:
wonderfly@google.com
█ sawlani@google.com
groeck@chromium.org
chromeos-kernel-security-bug-access@google.com
Components:
EstimatedDays: ----
NextAction: ----
OS: Chrome
Pri: 2
Type: Bug-Security



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CVE-2018-10878 CrOS: Vulnerability reported in Linux kernel

Project Member Reported by vomit.go...@appspot.gserviceaccount.com, Sep 23 
VOMIT (go/vomit) has received an external vulnerability report for the Linux kernel. 

Advisory: CVE-2018-10878
  Details: http://vomit.googleplex.com/advisory?id=CVE/CVE-2018-10878
  CVSS severity score: 6.1/10.0
  Description:

A flaw was found in the Linux kernel's ext4 filesystem. A local user can cause an out-of-bounds write and a denial of service or unspecified other impact is possible by mounting and operating a crafted ext4 filesystem image.



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

Comment 1 by zsm@chromium.org, Sep 24

Cc: groeck@chromium.org wonderfly@google.com
Labels: Security_Severity-Medium Security_Impact-Stable Pri-2
Owner: zsm@chromium.org
Status: Assigned (was: Untriaged)
Upstream commits are :-
819b23f1c5 ("ext4: always check block group bounds in ext4_init_block_bitmap()")
77260807 ("ext4: make sure bitmaps and the inode table don't overlap with bg descriptors")

These commits are present in v4.14, v4.4; they are not present in older kernels.

Comment 2 by wonderfly@google.com, Sep 24

Cc: sawlani@google.com

Comment 3 by zsm@google.com, Sep 24

Status: WontFix (was: Assigned)
These patches cause conflicts when applying to 3.18; backports are not present in 3.18.y. Marking as WontFix as the differences in ext4 between 3.18 and upstream are substantial.
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