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Operating System
Protection Revocation Access Rights
Q
What is false regarding Back-Pointers scheme to revoke capability?
AA. List of pointers is maintained with each object
BB. When revocation is required these pointers are followed
CC. This scheme is not adopted in multics system
DD. These point to all capabilities associated with that object
Correct Answer:
C. C. This scheme is not adopted in multics system
Explanation:
In the Back-Pointers scheme for revoking capabilities, a list of pointers is intentionally maintained from each object back to every capability that has been issued for it. This allows the system to follow the pointers and invalidate or change the capabilities when access rights need to be revoked. This specific scheme was adopted in the MULTICS system.
