CVE-2010-4238 xen dom0 issue

[Eugene Teo <eugene () redhat com>]

A missing sanity check was found in vbd_create() in the Xen hypervisor
implementation. As CD-ROM drives are not supported by the blkback 
back-end driver, attempting to use a virtual CD-ROM drive with blkback 
could trigger a denial of service (crash) on the host system running the 
Xen hypervisor.

https://bugzilla.redhat.com/CVE-2010-4238

This affects Red Hat Enterprise Linux 5 only. There's no upstream patch.

https://bugzilla.redhat.com/CVE-2010-4238

Eugene