CVE-2013-6456: Avoid unsafe use of /proc/$PID/root in LXC disk hotplug
Rewrite lxcDomainAttachDeviceDiskLive function to use the
virProcessRunInMountNamespace helper. This avoids risk of
a malicious guest replacing /dev with a absolute symlink,
tricking the driver into changing the host OS filesystem.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>
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