Security update for xorg-x11-server (important)

This update fixes two security issues with the X server:

• A local attacker could find out if a file exists by
  exploiting the way that Xorg creates its lock files.
  (CVE-2011-4028
  <<a href=“http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-4028”>http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-4028</a>
  > )
• A non-root local user could set the read permission
  for all users on any file or directory. (CVE-2011-4029
  <<a href=“http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-4029”>http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-4029</a>
  > )