Question 22 Rights can only be removed from protection domains in the access matrix by ______? the OS kernel admin users any user the owner
Added by Larry R.
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An access matrix is a security model that defines the permissions of subjects (users, processes) to objects (files, resources). Show more…
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Identity two activities that can be performed by an operating system's administrator but not by a typical user.
Answer each of the following in terms of an operating system that you use: a. How does the operating system restrict access to only those who are approved users? b. How do you ask the operating system to show you what processes are currently in the process table? c. How do you tell the operating system that you do not want other users of the machine to have access to your files?
Problem I. Using the given access matrix on the right, for each one of the following messages generated by the operating system or an access control interface module in response to an access attempt, describe (1) which controller (access control module) receives and processes this message, (2) whether this access attempt is authorized or rejected, and (3) how the access matrix is updated and what is w if any. (Hints: each attempt starts with the initially given access matrix; you just need plot the modified part or state "no change". "A[S2, P2]=wakeup" is not enough, please plot the entry labeled with S2/P2 as the row/column indices and fill in wakeup.) a) S1, read, F1 b) S2, stop, P2 c) S3, wakeup, P1 d) S3, transfer write to S1, F2 e) S2, grant seek* to S3, D1 f) S1, delete write from S3, F2 g) S1, w ← read S2, D1 h) S2, create object D3 i) S1, destroy object D2 j) S3, create subject S4 k) S1, destroy subject S2
Akash M.
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