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     5 \begin{document}

     6 

     7 \section*{Homework 3}

     8 

     9 \begin{enumerate}

    10 \item What does the principle of least privilege say?

    11 

    12 \item In which of the following situations can the access control mechanism of Unix

    13 file permissions be used?

    14 

    15 \begin{itemize}

    16 \item[(a)] Alice wants to have her files readable, except for her office mates.

    17 \item[(b)] Bob and Sam want to share some secret files.

    18 \item[(c)] Root wants some of her files to be public.

    19 \end{itemize}

    20 

    21 \item What should the architecture of a network application under Unix 

    22 be that processes potentially hostile data?

    23 

    24 \item How can you exploit the fact that every night root has a cron

    25 job that deletes the files in \texttt{/tmp}?

    26 

    27 \item What does it mean that the program \texttt{passwd} has the \texttt{setuid}

    28 bit set? Why is this necessary?

    29 

    30 \item What does the Bell --- La Padula model ensure? Similarly, what does the Biba model ensure?

    31 \end{enumerate}

    32 

    33 \end{document}

    34 

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