kernel: fixed local privilege escalation (important)

The Linux kernel was updated to 3.4.33 and to fix a local
root privilege escalation and various other security and
non-security bugs.

CVE-2013-1763: A out of bounds access in sock_diag could be
used by local attackers to execute code in kernel context
and so become root.

CVE-2013-0160: The atime of /dev/ptmx is no longer updated,
avoiding side channel attacks via user typing speed.

CVE-2012-5374: Denial of service via btrfs hashes could
have been used by local attackers to cause a compute denial
of service.

CVE-2013-0216: Fixed a problem in XEN netback: shutdown the
ring if it contains garbage.

CVE-2013-0231: Fixed a problem in XEN pciback: rate limit
error messages from xen_pcibk_enable_msi(x).