CVE request: Qemu: 9p: directory traversal flaw in 9p virtio backend

[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 a directory/path traversal issue. 
It could occur while creating or accessing files on a shared host directory.

A privileged user inside guest could use this flaw to access undue files on 
the host.

Upstream patches:
-----------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2016-08/msg03917.html

Reference:
----------
  -> http://wiki.qemu.org/Documentation/9psetup

This flaw was reported by Mr Felix Wilhelm.

Thank you.
--
Prasad J Pandit / Red Hat Product Security Team
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