Written Assignment

	To do this assignment, you had to implement either a setuid
	or a message-passing setup.  Naturally, you tested your setup,
	not just for functionality -- could you store and retrieve
	the proper files? -- but also for security: were the proper
	access controls used?  Did they block unauthorized attempts?

	You may find that some of the tests you performed are
	specific to the specific approach you took, setuid or message-passing.
	Explain which of your test cases are specific to your
	approach; outline what other test cases you'd use for the
	other approach.  That is, explain how to test for flaws that
	are specific to each of the two approaches.