CVE request Qemu: 9pfs: memory leakage when creating extended attribute

[P J P <ppandit () redhat com>]

  Hello,

Quick Emulator(Qemu) built with the VirtFS, host directory sharing via Plan 9 
File System(9pfs) support, is vulnerable to memory leakage issue. It could 
occur while creating extended attribute via 'Txattrcreate' message.

A privileged user inside guest could use this flaw to leak host memory, thus 
affecting other services on the host and/or potentially crash the Qemu process 
on the host.

Upstream patches:
-----------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2016-10/msg01861.html

Reference:
----------
  -> http://wiki.qemu.org/Documentation/9psetup
  -> https://bugzilla.redhat.com/show_bug.cgi?id=1389550

This issue was reported by Li Qiang of 360.cn Inc.

Thank you.
--
Prasad J Pandit / Red Hat Product Security Team
47AF CE69 3A90 54AA 9045 1053 DD13 3D32 FE5B 041F