[Bug 285782] Jail escape via directory rename outside of jail $path.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=285782

--- Comment #2 from Konstantin Belousov <kib@FreeBSD.org> ---
I suspect this thing can be made into sort-of exploit if nested jails are
enabled.  There, you would replace the 'host' by upper jail, and the jail
is created as subordinate of the upper jail. Then if a process in the sub-
ordinate jail owns the file descriptor pointing to the directory that is
moved out of the hierarchy of the sub-ord (and upper jail can do that),
the process can escape into host namespace.

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