Question

1. (10 points) Given the following access matrix, answer the questions below: Object/ F1 Domain F3 DI Laser Printer D2 D3 D1 read switch D2 print control read execute owner write write read (a) What tasks can Di perform in the context of the table above? A. read F1, print to D2 via switch, copy read permission to other domains that access F1 B. read F2 C. write F3 D. execute F3 (b) What does the control keyword mean in the context of the table above? A. D2 can control the access right of D4 B. D3 can control the access rights of D4 C. D4 can control the access rights of D3 D. D4 can write to FI (c) What does the owner keyword mean in the context of the table above? A. D3 is the owner of F2 and can control the access rights of other domains that have access to F2 B. D4 is the owner of F2 and can control the access rights of other domains that have access to F2 C. D3 can give D2 'write permission to F2 D. Both A and C Page 7

Answer 1

A) read F1, print to D2 via switch , copy read permission to other domains that access F1.

• If a domain has switch access it can switch the domains easily and also it can copy the access rights to other domains. If there is no astric over the access then it can transfer rather than copy that access right to other domain.

1. D2 can control the access right of D4.

If the control right is given to the domain then it can control the access rights of other domain which it have control over.

D) both A and C.

The domain which is the owner of object it has the right to control the access of other domains having that object . it can be able to grant and revoke the access of other domains.

1. D1, D2, D4

For executing by using the laser printer we can have 3 domains d1, d2, d4.

Because the D1, is responsible to switch read or scan operations.

D2 used for print.

D4 is used for controlling the device.