[opensuse] Who and why removes permissions to /dev/null ?

Hello,

With opensuse-11.1 and kde4, I have seen three times on two different
boxes that the mode of /dev/null was changed to 600. This breaks
lots of scripts, which assume /dev/null is writable by anybody.

The timestamp of /dev/null is also changed. Since chmod don't change
the timestamp, this means the file is removed and recreated.

When this happens, I see the following entries in /var/log/messages:

Mar 6 15:03:16 raven polkit-grant-helper[13820]: granted authorization for org.freedesktop.packagekit.system-update to pid 4407 [uid=1000] [auth=root]
Mar 6 15:03:22 raven shadow[14072]: default group changed - account=nobody, uid=65534, gid=65533, old gid=65533, by=0
M

What is polkit-grant-helper and what kind of system-update is it doing?
And why is it removing and recreating /dev/null?

Any ideas?
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