kernel security and bug fix update

[2.4.21-58.0.0.0.1.EL]

• add directio support for qla drivers (herb) [ora 6346849]
• support PT Quad card [ora 5751043]
• io to nfs partition hangs [ora 5088963]
• add entropy for bnx2 nic [ora 5931647]
• avoid large allocation-fragmentation in MTU (zab)
• fix clear highpage (wli)
  [2.4.21-58.EL]
• copy_user doesn’t zero tail bytes on page fault (Don Howard) [433941] {CVE-2008-2729}
• Fix long symlink support (Fabio Olive Leite) [BZ 438758]
• Fix possible buffer overflow in ASN.1 parsing routine (Don Howard) [444461] {CVE-2008-1673}
• Fix exploitable remote memory leak in sit (Don Howard) [446034] {CVE-2008-2136}
• Fix possible panic in mptctl_gettargetinfo (Don Howard) [451955]
• Add add NULL pointer checks in tty drivers (Don Howard) [453158] {CVE-2008-2812}
• Add a kernel parameter to disable lost tick accounting on x86_64 (Don Howard) [455921]
• Fix possible isdn_net buffer overflows (Don Howard) [456361] {CVE-2007-6063}
• Fix lookup on deleted directory (Eugene Teo) [457862] {CVE-2008-3275}
• Add missing capability checks in sbni_ioctl (Eugene Teo) [460404] {CVE-2008-3525}
• Remove suid/sgid bits on ftruncate (dhoward) [463684] {CVE-2008-4210}