CVE-2019-8934 QEMU: ppc64: sPAPR emulator leaks the host hardware identity

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

  Hello,

It was found that the KVM PPC64 emulator for the sPAPR machine leaks the host 
hardware identity to all running guests. The sPAPAR(hw/ppc/spapr.c) emulator 
populates the device tree for the guest with two fields "host-serial" and 
"host-model". The values for these fields are taken via hypervisor from the 
host device tree data exposed in "/proc/device-tree/system-id" and 
"/proc/device-tree/model" file respectively.

Upstream patch:
---------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2019-02/msg04821.html

CVE-2019-8934 assigned via https://cveform.mitre.org/

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