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What is the problem of mutually suspicious subsystem?

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in Operating System by (102k points)
What is the problem of mutually suspicious subsystem?

(a) Service program can steal users data

(b) Service program can malfunction and retain some rights of data provided by user

(c) Calling program can get access to restricted portion from service program

(d) Calling program gets unrestricted access

I had been asked this question in examination.

Asked question is from Protection in chapter Protection of Operating System

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The correct choice is (b) Service program can malfunction and retain some rights of data provided by user

The explanation is: Both calling program and service program are vulnerable to access each others private data/rights.

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