kernel security and bug fix update

[2.6.18-274.18.1.0.1.el5]

• [net] bonding: fix carrier detect when bond is down (John Haxby) [orabug 13652598]
• fix ia64 build error due to add-support-above-32-vcpus.patch(Zhenzhong Duan)
• [x86] use dynamic vcpu_info remap to support more than 32 vcpus (Zhenzhong Duan)
• [scsi] add additional scsi medium error handling (John Sobecki) [orabug 12904887]
• [x86] Fix lvt0 reset when hvm boot up with noapic param
• [scsi] remove printk’s when doing I/O to a dead device (John Sobecki, Chris Mason)
  [orabug 12342275]
• [char] ipmi: Fix IPMI errors due to timing problems (Joe Jin) [orabug 12561346]
• [scsi] Fix race when removing SCSI devices (Joe Jin) [orabug 12404566]
• [fs] nfs: Fix __put_nfs_open_context() NULL pointer panic (Joe Jin) [orabug 12687646]
• [scsi] fix scsi hotplug and rescan race [orabug 10260172]
• fix filp_close() race (Joe Jin) [orabug 10335998]
• make xenkbd.abs_pointer=1 by default [orabug 67188919]
• [xen] check to see if hypervisor supports memory reservation change
  (Chuck Anderson) [orabug 7556514]
• [net] Enable entropy for bnx2,bnx2x,e1000e,igb,ixgb,ixgbe,ixgbevf (John Sobecki)
  [orabug 10315433]
• [NET] Add xen pv netconsole support (Tina Yang) [orabug 6993043] [bz 7258]
• [mm] shrink_zone patch (John Sobecki,Chris Mason) [orabug 6086839]
• fix aacraid not to reset during kexec (Joe Jin) [orabug 8516042]
• [rds] Patch rds to 1.4.2-20 (Andy Grover) [orabug 9471572, 9344105]
  RDS: Fix BUG_ONs to not fire when in a tasklet
  ipoib: Fix lockup of the tx queue
  RDS: Do not call set_page_dirty() with irqs off (Sherman Pun)
  RDS: Properly unmap when getting a remote access error (Tina Yang)
  RDS: Fix locking in rds_send_drop_to()
• [xen] PVHVM guest with PoD crashes under memory pressure (Chuck Anderson)
  [orabug 9107465]
• [xen] PV guest with FC HBA hangs during shutdown (Chuck Anderson)
  [orabug 9764220]
• Support 256GB+ memory for pv guest (Mukesh Rathor) [orabug 9450615]
• fix overcommit memory to use percpu_counter for el5 (KOSAKI Motohiro,
  Guru Anbalagane) [orabug 6124033]
• [ipmi] make configurable timeouts for kcs of ipmi [orabug 9752208]
• [ib] fix memory corruption (Andy Grover) [orabug 9972346]
• [aio] patch removes limit on number of retries (Srinivas Eeda) [orabug 10044782]
• [loop] Do not call loop_unplug for not configured loop device (orabug 10314497)

[2.6.18-274.18.1.el5]

• [misc] Move exit_robust_list to mm_release, null lists on cleanup (Laszlo Ersek) [771774 750283] {CVE-2012-0028}
• [block] disable SG_IO ioctls on virtio-blk devices (Paolo Bonzini) [773322 771592]
• [scsi] fix 32-on-64 block device ioctls (Paolo Bonzini) [752385 752386] {CVE-2011-4127}
• [dm] do not forward ioctls from logical volumes to the underlying device (Paolo Bonzini) [752385 752386] {CVE-2011-4127}
• [block] fail SCSI passthrough ioctls on partition devices (Paolo Bonzini) [752385 752386] {CVE-2011-4127}
• [block] add and use scsi_blk_cmd_ioctl (Paolo Bonzini) [752385 752386] {CVE-2011-4127}
• [fs] ext4: fix BUG_ON() in ext4_ext_insert_extent() (Lukas Czerner) [747943 747946] {CVE-2011-3638}
• [scsi] don’t fail scans when host is in recovery (Rob Evers) [772162 657345]
• [fs] jbd2: clear BH_Delay & BH_Unwritten in journal_unmap_buffer (Eric Sandeen) [783477 783284] {CVE-2011-4086}
• [net] igmp: Avoid zero delay when receiving odd mixture of IGMP queries (Jiri Pirko) [772868 772869] {CVE-2012-0207}