[EMAIL PROTECTED] said:
>   FreeBSD 4.0 introduced the jail(2) system call and jail(8)
> management utility.  Basically, the "jail" subsystem lets you create
> "prisons" which are almost full virtual machines, in which even the
> "root" user has limited powers.

My user-mode port of the Linux kernel gives you a true Linux virtual machine.  
Anything running inside it is running inside a pretty solid jail (modulo a 
couple of holes that I haven't closed up yet).

                                Jeff



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