We will explore some user-level sandboxing technology and how it can help us
with designing secure programs. In particular, we will look at a variant of
privilege separation which works for user-level programs.

Unfortunately, the OS on `aisa` is too old (or rather too conservatively
configured) for this exercise. Please log into `nymfeNN` where NN is your UČO
`mod` 6 + 1 (example: for me, that is 139761, that comes out as `nymfe04`).
The home directories on those computers are shared with `aisa`.

You can use your favourite terminal-based editor, or you can copy files back
and forth (as you prefer). Use `cc` to compile C programs. Let's start by
inspecting `newns.c`.