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Date: Tue,  6 Sep 2016 20:54:43 -0400 (EDT)
From: cve-assign@...re.org
To: ppandit@...hat.com
Cc: cve-assign@...re.org, oss-security@...ts.openwall.com, liqiang6-s@....cn
Subject: Re: CVE request: Qemu: scsi: pvscsi: infintie loop when building SG list

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> Quick Emulator(Qemu) built with the VMWARE PVSCSI paravirtual SCSI bus
> emulation support is vulnerable to an infinite loop issue. It could occur
> while processing an IO request descriptor, building SG list.
> 
> A privileged user inside guest could use this flaw to crash the Qemu process
> resulting in DoS.
> 
> https://lists.gnu.org/archive/html/qemu-devel/2016-09/msg00772.html
> https://bugzilla.redhat.com/show_bug.cgi?id=1373478

>> In PVSCSI paravirtual SCSI bus, the request descriptor data
>> length is defined to be 64 bit. While building SG list from
>> a request descriptor, it gets truncated to 32bit in routine
>> 'pvscsi_convert_sglist'. This could lead to an infinite loop
>> situation for arbitrarily large 'dataLen' values. Check
>> SG list element count to avoid  it.

Use CVE-2016-7156.

This is not yet available at
http://git.qemu.org/?p=qemu.git;a=history;f=hw/scsi/vmw_pvscsi.c but
that may be an expected place for a later update.

- -- 
CVE Assignment Team
M/S M300, 202 Burlington Road, Bedford, MA 01730 USA
[ A PGP key is available for encrypted communications at
  http://cve.mitre.org/cve/request_id.html ]
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