Created attachment 710453 [details]
qemu-9pfs-only-allow-directories-during-walk.patch

Ref: http://seclists.org/oss-sec/2017/q1/117
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  Hello,

Quick Emulator(Qemu) built with the VirtFS, host directory sharing via Plan 9
File System(9pfs) support, is vulnerable to an improper link following issue.
It could occur while accessing symbolic link files on a shared host directory.


A privileged user inside guest could use this flaw to access host file system
beyond the shared folder and potentially escalating their privileges on a host.


Reference:
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  -> http://wiki.qemu.org/Documentation/9psetup
  -> https://bugzilla.redhat.com/show_bug.cgi?id=1413929


Please see a proposed patch to fix this issue attached herein.

This issue was discovered by Jann Horn of Google Project Zero.

'CVE-2016-9602' has been assigned to this issue by Red Hat Inc.

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