1. Consider Multics procedures p and q. Procedure p is executing and needs to in

Question

1. Consider Multics procedures p and q. Procedure p is executing and needs
to invoke procedure q. Procedure q’s access bracket is (5, 6) and its call
bracket is (6, 9). Assume that q’s access control list gives p full (read,
write, append, and execute) rights to q. In which ring(s) must p execute for
the following to happen?

a. p can invoke q, but a ring-crossing fault occurs.

b. p can invoke q provided that a valid gate is used as an entry point.

c. p cannot invoke q.

d. p can invoke q without any ring-crossing fault occuring, but not necessarily through a valid gate.

Explanation / Answer

Answer: Option: b. p can invoke q provided that a valid gate is used as an entry point.                                 

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