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SubjectRe: prevent breaking a chroot() jail?

> I'm trying to develop a way to ensure that one can't break out of a
> chroot() jail, even as root. I'm willing to change the way the syscalls
> work (most likely only for a subset of processes, i.e. processes that
> are run in the jail end up getting a marker which is passed down to all
> their children that causes the syscalls to behave differently).
> What should I be aware of? I figure devices (no need to run mknod in
> this jail) and chroot (as per man page), is there any other way of
> breaking the chroot jail (at a syscall level or otherwise)?, or UML. Its hard to do with chroot(). Think
kill(-9, -1).
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