With the changed xauth bits in FC6, trying to read ~/.Xauthority and "assuming" that works as sudo has done in the past doesn't continue to work.
Does it mean that sudo su - and running X app from the shell doesn't work? This probably never worked right. Or that direct sudo Xapp doesn't work?
I think "sudo xapp" has never worked. See https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=164671#c4
It worked fine in FC5 (as long as you're sudo'ing on the local machine) as the xauth cookie was readable and things worked. Now that we do xauth based on user (to avoid hostname changes breaking things), it's broken
Default sudoers file must be modified to contain 'XAUTHORITY' in the 'Defaults env_keep' settings. Problem solved.
thnx. Tomas, it's fixed in sudo-1.6.8p12-9
latest-pkg dist-fc6 sudo sudo-1.6.8p12-9 dist-fc6 pvrabec