CVE request Qemu: i386: leakage of stack memory to guest in kvmvapic.c

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

  Hello,

Qemu emulator built with the Task Priority Register(TPR) optimizations for 
32-bit Windows guests, is vulnerable to a information leakage issue. It could 
occur while accessing Task Priority Register(TPR).

A privileged user/process inside guest could use this issue to leak host 
memory bytes.

Upstream patch:
---------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2016-04/msg01118.html

Reference:
----------
  -> https://bugzilla.redhat.com/show_bug.cgi?id=1313686

This issue was discovered by Donghai Zdh of Alibaba Inc.

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