xen security and bug fix update

[3.0.3-41.el5_1.5]

• Disable QEMU image format auto-detection CVE-2008-2004 (rhbz #444700)
  [3.0.3-41.el5_1.4]
• Fix PVFB to validate frame buffer description (rhbz #443376)
• Fix PVFB to cope with bogus update requests (rhbz #368931)
  [3.0.3-41.el5_1.3]
• Fix QEMU buffer overflow CVE-2007-5730 (rhbz #360381)
• Fix QEMU block device extents checking CVE-2008-0928 (rhbz #433560)
  [3.0.3-41.el5_1.2]
• Fix FV O_DIRECT flushing (rhbz #435495)
  [3.0.3-41.el5_1.1]
• Fixed xenbaked tmpfile flaw (CVE-2007-3919) (rhbz #350421)