kernel security and bug fix update

[2.6.18-308.20.1.el5]

• Revert: [x86] mm: randomize SHLIB_BASE (Dave Anderson) [804953 804954] {CVE-2012-1568}
  [2.6.18-308.19.1.el5]
• [net] be2net: Remove code that stops further access to BE NIC based on UE bits (Alexander Gordeev) [867896 862811]
• [net] netpoll: fix an incorrect check for NULL pointer (Alexander Gordeev) [856079 848098]
• [net] mlx4: Add support for EEH error recovery (Alexander Gordeev) [847404 798048]
• [fs] ext4: fix undefined bit shift result in ext4_fill_flex_info (Eric Sandeen) [809688 809689] {CVE-2012-2100}
• [fs] ext4: fix undefined behavior in ext4_fill_flex_info (Eric Sandeen) [809688 809689] {CVE-2012-2100}
• [fs] fix crash if block {device|size} read & changed at sametime (Mikulas Patocka) [864823 756506]
• [x86] mm: randomize SHLIB_BASE (Dave Anderson) [804953 804954] {CVE-2012-1568}
• [net] ipv6: Fix fib6_dump_table walker leak (Jiri Benc) [861387 819830]
• [fs] cifs: update cifs_dfs_d_automount caller path (Sachin Prabhu) [858774 857448]
• [xen] x86: change the default behaviour of CVE-2012-2934 fix (Petr Matousek) [859946 858724]
• [net] ipvs: allow transmit of GRO aggregated skbs (Jesper Brouer) [857966 854067]
• [scsi] isci: fixup linkspeed definitions (David Milburn) [854986 833000]
• [fs] nfs: nfs_d_automount update caller path after do_add_mount (Carlos Maiolino) [857552 834379]
• [fs] vfs: Fix vfsmount overput on simultaneous automount (Carlos Maiolino) [857552 834379]
  [2.6.18-308.18.1.el5]
• [fs] autofs4: Merge the remaining dentry ops tables (Ian Kent) [857558 850977]
  [2.6.18-308.17.1.el5]
• [fs] cifs: Invalidate file cache in case of posix open (Sachin Prabhu) [857964 852526]