CVE-2017-11334 Qemu: exec: oob access during dma operation

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

  Hello,

Qemu emulator built to use 'qemu_map_ram_ptr' to access guests' ram block area 
is vulnerable to a OOB r/w access issue. It could occur during a DMA 
operation.

A privileged user inside guest could use this flaw to crash the guest instance 
resulting in DoS.

Upstream patch:
---------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2017-07/msg03775.html

Reference:
----------
  -> https://bugzilla.redhat.com/show_bug.cgi?id=1471638

This issue was reported by Mr Alex.

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