Unbreakable Enterprise kernel security update

[2.6.39-300.28.1]

• kmod: make __request_module() killable (Oleg Nesterov) [Orabug: 16286305]
  {CVE-2012-4398}
• kmod: introduce call_modprobe() helper (Oleg Nesterov) [Orabug: 16286305]
  {CVE-2012-4398}
• usermodehelper: implement UMH_KILLABLE (Oleg Nesterov) [Orabug: 16286305]
  {CVE-2012-4398}
• usermodehelper: introduce umh_complete(sub_info) (Oleg Nesterov) [Orabug:
  16286305] {CVE-2012-4398}
• KVM: x86: invalid opcode oops on SET_SREGS with OSXSAVE bit set
  (CVE-2012-4461) (Jerry Snitselaar) [Orabug: 16286290] {CVE-2012-4461}
• exec: do not leave bprm->interp on stack (Kees Cook) [Orabug: 16286267]
  {CVE-2012-4530}
• exec: use -ELOOP for max recursion depth (Kees Cook) [Orabug: 16286267]
  {CVE-2012-4530}

[2.6.39-300.27.1]

• xen-pciback: rate limit error messages from xen_pcibk_enable_msi{,x}() (Jan
  Beulich) [Orabug: 16243736] {CVE-2013-0231}
• Xen: Fix stack corruption in xen_failsafe_callback for 32bit PVOPS guests.
  (Frediano Ziglio) [Orabug: 16274171] {CVE-2013-0190}
• netback: correct netbk_tx_err to handle wrap around. (Ian Campbell) [Orabug:
  16243309]
• xen/netback: free already allocated memory on failure in
  xen_netbk_get_requests (Ian Campbell) [Orabug: 16243309]
• xen/netback: don’t leak pages on failure in xen_netbk_tx_check_gop. (Ian
  Campbell) [Orabug: 16243309]
• xen/netback: shutdown the ring if it contains garbage. (Ian Campbell)
  [Orabug: 16243309]
• ixgbevf fix typo in Makefile (Maxim Uvarov) [Orabug: 16179639 16168292]