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1. Extend the semantics of the information flow security mechanism in Section 15.2.1 for records (structures).

1. Extend the semantics of the information flow security mechanism in Section 15.2.1 for records (structures).

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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The structure consists of several fields, each of which acts like a variable. Say you have a structure with two integer fields, x and y. You want to assign the value of x to a variable. What information flow constraints must be satisfied? Similarly, if you want to assign the entire structure to another, what information flow constraints must be satisfied? The question requires us to initialize a structure by ourselves, then we assume an assignment for this structure and consider what constraints this information flow must be satisfied.

Here is an example structure in C:

struct xyzzy {
int firstfield;
char secondfield[10];
char *thirdfield;
float fourthfield;
};

1. Extend the semantics of the information flow security mechanism in Section 15.2.1 for records (structures).
Transcribed Image Text:1. Extend the semantics of the information flow security mechanism in Section 15.2.1 for records (structures).
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