CVE-2014-7283

Published: 13 October 2014

The xfs_da3_fixhashpath function in fs/xfs/xfs_da_btree.c in the xfs implementation in the Linux kernel before 3.14.2 does not properly compare btree hash values, which allows local users to cause a denial of service (filesystem corruption, and OOPS or panic) via operations on directories that have hash collisions, as demonstrated by rmdir operations.

From the Ubuntu Security Team

Hannes Frederic Sowa reported a hash collision ordering problem in the xfs filesystem in the Linux kernel. A local user could exploit this flaw to cause filesystem corruption and a denial of service (oops or panic).

Notes

android kernels (flo, goldfish, grouper, maguro, mako and manta) are
not supported on the Ubuntu Touch 14.04 preview kernels
linux-lts-saucy no longer receives official support
linux-lts-quantal no longer receives official support
per Debian, introduced in 3.10
reproducer: http://oss.sgi.com/cgi-bin/gitweb.cgi?p=xfs/cmds/xfstests.git;a=commitdiff;h=947ee8bd4b59770534297572b14c695e9c6e001e
per apw, this was fixed in passing in 3.13.0-39.66~precise1, part of
https://ubuntu.com/security/notices/USN-2394-1, but not documented in the changelog or
the USN.

Status

References

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-7283
• http://marc.info/?l=linux-xfs&m=139590613002926&w=2
• https://ubuntu.com/security/notices/USN-2226-1
• https://ubuntu.com/security/notices/USN-2239-1
• https://ubuntu.com/security/notices/USN-2394-1
• https://ubuntu.com/security/notices/USN-2260-1
• NVD
• Launchpad
• Debian

Bugs

• https://launchpad.net/bugs/1377337