CVE request Qemu: OOB access in address_space_rw leads to segmentation fault

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

  Hello,

Qemu emulator built to use 'address_space_translate' to map an address to a 
MemoryRegionSection is vulnerable to an OOB r/w access issue. It could occur 
while doing pci_dma_read/write calls. Affects Qemu versions >= 1.6.0 and <= 
2.3.1.

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

Upstream patches:
-----------------
  ->  http://git.qemu.org/?p=qemu.git;a=commit;h=c3c1bb99d1c11978d9ce94d1bd
  ->  http://git.qemu.org/?p=qemu.git;a=commit;h=e4a511f8cc6f4a46d409fb5c9f
  ->  http://git.qemu.org/?p=qemu.git;a=commit;h=965eb2fcdfe919ecced6c34803
  ->  http://git.qemu.org/?p=qemu.git;a=commit;h=b242e0e0e2969c044a318e56f7
 [*] https://lists.gnu.org/archive/html/qemu-stable/2016-01/msg00060.html

Reference:
----------
  -> https://bugzilla.redhat.com/show_bug.cgi?id=1300771

This issue was discovered by  Donghai Zdh of Alibaba Inc.

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