freebsd security - Feb 2005 - mac questions: stopping root from reading /home && mac_biba stops clean shutdown

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I just try to understand the concepts and possiblities behind the mac
framework. After days of puzzling I found one puzzling behaviour and
still have one immediate question (this is on 5-stable)

- - when I enable mac_biba, set root to biba/equal (or any value,
actually), and do a setfmac -R biba/equal / I expect biba to be
activated without any change to the system behaviour. This seems to be
correct, safe for one detail: the system does not shutdown cleanly: it
syncs, but never gets to power down or reboot and the disks are not
marked clean, so fsck run on next boot.

Is this an expected behaviour??

- - What is the easiest way to block root from reading /home once the
system is in multiuser....

Thanks for any hints, tips, links to background info about biba + mls

Mathias

P.S.: bsdextended does not block root from anything, right??
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