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Sol_quiz3 - Cmd does Process p gives read access to process...

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IS2150/TEL2810, Quiz 3, September 29, 2009, (Total Points: 15) Name: ________________________ 1. Write T for True and F for False for the following statements [Points: 6] [ T ] If one can take a problem that has been proven to be undecidable and show that it can be reduced to the safety problem , then he/she has proven that the safety problem is also undecidable . [ T ] The following command is mono-operational and mono-conditional Command Cmd ( p, f, q ) If own in a [ p,f ] Then Enter read into a [ q,f ] End b. State what command
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Unformatted text preview: Cmd does. Process p gives read access to process q on file f that p owns . 2. Complete post conditions for the following command [Points: 4] Enter r into a [ s , o ] Postconditions: Precondition: s ∈ S , o ∈ O S ´ = S , O ´ = O (in Slides) 3. Fill the access control matrix entry corresponding to the Turing machine configuration shown in the figure. [Points: 5] s 1 s 2 s 3 s 4 s 4 s 3 s 2 s 1 A X Y,k D,end own own own A X Y … head Current state is k Current symbol is Y D 1 2 3 4...
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