Pardon my ignorance on the whole issue but I'm just a lurker trying to understand enough to help out. =)
I know security on parrot like this would be difficult, and this thread is specifically about securing PASM, but what about something like FreeBSD's 'jail' command built in? That way, even untrusted code could possibly be set(somewhere in the parrot configuration, compile time, command line, enviroment, etc...) to be jailed. The man pages are here:

http://www.freebsd.org/cgi/man.cgi?query=jail&apropos=0&sektion=0&manpath=FreeBSD+5.0-current&format=html
http://www.freebsd.org/cgi/man.cgi?query=jail&apropos=0&sektion=2&manpath=FreeBSD+5.0-current&format=html

I don't know if this will help or not, but this discussion brought to my mind this. If anyone wants the source it should be available via the web or I can forward it to any who ask.

Sorry for being so out of the loop. =/

--Joseph Guhlin
http://www.josephguhlin.com/

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