kernel security and bug fix update

kernel
[2.6.18-348.1.1]

• [pci] intel-iommu: reduce max num of domains supported (Don Dutile) [886876 885125]
• [fs] gfs2: Fix leak of cached directory hash table (Steven Whitehouse) [886124 831330]
• [x86] mm: randomize SHLIB_BASE (Petr Matousek) [804953 804954] {CVE-2012-1568}
• [net] be2net: create RSS rings even in multi-channel configs (Ivan Vecera) [884702 878209]
• [net] tg3: Avoid dma read error (John Feeney) [885692 877474]
• [misc] Fix unsupported hardware message (Prarit Bhargava) [885063 876587]
• [net] ipv6: discard overlapping fragment (Jiri Pirko) [874837 874838] {CVE-2012-4444}
• [usb] Fix serial port reference counting on hotplug remove (Don Zickus) [885700 845447]
• [net] bridge: export its presence and fix bonding igmp reporting (Veaceslav Falico) [884742 843473]
• [fs] nfs: move wait for server->active from put_super to kill_sb (Jeff Layton) [884708 839839]
• [scsi] libfc: fix indefinite rport restart (Neil Horman) [884740 595184]
• [scsi] libfc: Retry a rejected PRLI request (Neil Horman) [884740 595184]
• [scsi] libfc: Fix remote port restart problem (Neil Horman) [884740 595184]
• [xen] memop: limit guest specified extent order (Laszlo Ersek) [878449 878450] {CVE-2012-5515}
• [xen] get bottom of EBDA from the multiboot data structure (Paolo Bonzini) [885062 881885]