Jails in 6.0 and devfs woes

[Andrew Hacking]

I am trying to setp a jail in RELENG_6, and cannot apply the jail
ruleset (ruleset 4) to the jail devfs mount point.  The system also
hangs if I try to apply the rules individually.

I raised PR/93423 for this issue. See
http://www.freebsd.org/cgi/query-pr.cgi?pr=93423 for details

I am wondering if anyone else has had any success securing their jails
(ie removing  device nodes such as those that provide raw access to
disks) ?