kernel security and bug fix update

kernel
[2.6.18-348.6.1]

• [char] ipmi: use a tasklet for handling received messages (Tony Camuso) [953435 947732]
• [char] ipmi: do run_to_completion properly in deliver_recv_msg (Tony Camuso) [953435 947732]
• [fs] nfs4: fix locking around cl_state_owners list (Dave Wysochanski) [954296 948317]
• [fs] nfs: Fix bugs on short read (Sachin Prabhu) [952098 924011]
• [xen] AMD IOMMU: spot missing IO-APIC entries in IVRS table (Igor Mammedov) [910912 910913] {CVE-2013-0153}
• [xen] AMD, IOMMU: Make per-device interrupt remap table default (Igor Mammedov) [910912 910913] {CVE-2013-0153}
• [xen] AMD, IOMMU: Disable IOMMU if SATA Combined mode is on (Igor Mammedov) [910912 910913] {CVE-2013-0153}
• [xen] AMD, IOMMU: On creating entry clean up in remapping tables (Igor Mammedov) [910912 910913] {CVE-2013-0153}
• [xen] ACPI: acpi_table_parse() should return handler’s err code (Igor Mammedov) [910912 910913] {CVE-2013-0153}
• [xen] introduce xzalloc() & Co (Igor Mammedov) [910912 910913] {CVE-2013-0153}
• [x86] fpu: fix CONFIG_PREEMPT=y corruption of FPU stack (Prarit Bhargava) [948187 731531]
• [i386] add sleazy FPU optimization (Prarit Bhargava) [948187 731531]
• [x86-64] non lazy ‘sleazy’ fpu implementation (Prarit Bhargava) [948187 731531]
  [2.6.18-348.5.1]
• [fs] nfs: handle getattr failure during nfsv4 open (David Jeffery) [947736 906909]