CS 3423 Operating Systems Assignment 13 ● No programming for this assignment. [100 points] Problem Set 1. [20 points] What are the main differences between capability lists and access lists? 2. [20 points] Consider a computing environment where a process is given the privilege of accessing an object only n times. Suggest a scheme for implementing this policy. 3. [20 points] Capability lists are usually kept within the address space of the user. How does the system ensure that the user cannot modify the contents of the list? 4. [20 points] 14.3 Consider a computer system in which computer games can be played by students only between 10 P.M. and 6 A.M., by faculty members between 5 P.M. and 8 A.M., and by the computer center staff at all times. Suggest a scheme for implementing this policy efficiently. 5. [20 points] 14.8 Discuss the need for rights amplification in Hydra. How does this practice compare with the cross-ring calls in a ring-protection scheme?
