Re: Different roots for each process possible?

[Roland McGrath <frob@debian.org>]

> On Unix root can break out of the chrooted environment by the following:
> 
> # mknod hda1 b 3 1; # assume hda1 is your root filesystem
> # mkdir mnt
> # mount -n hda1 mnt
> # chroot mnt
> # echo "I'm now in the original root directory!"
> 
> Of course, you can still use system calls to achieve the same result.
> 
> Is there such an escape possible too?

The Hurd equivalent of this would not put in the original root directory,
but in the root directory of a second filesystem using the same disk device.

There will always be many ways for a process that is root to get access
to the system-wide state.