Question

Suppose we have the following objects with the given integrity levels Subjects Integrity Levels S1 High...

Suppose we have the following objects with the given integrity levels

Subjects

Integrity Levels

S1

High

S2

Low

S3

Very Low

Objects

Integrity Levels

O1

High

O2

Low

O3

Very Low

At the end of the following sequence of operations, what will be the new integrity levels

assuming the LOMAC policy for subject is in effect?

Operations:

  1. S1 writes O1
  2. S1 reads O3
  3. S2 reads O2
  4. S3 writes O2
  5. S2 writes O3

Homework Answers

Answer #1

As per Low-Water Mark Integrity Audit Policy

The integrity levels of subjects and objects both change to reflect the contamination.

After s observes o, the integrity level of s is lowered to min(i(s), i(o))

After s modifies o, the integrity level of o is lowered to min(i(s), i(o))

Operations:

1. S1 writes O1 = Integrity level of O1 is lowered to min(i(S1), i(O1)) which is High

2. S1 reads O3 = Integrity level of S1 is lowered to min(i(S1), i(O3)) which is Very Low

3. S2 reads O2= Integrity level of S2 is lowered to min(i(S2), i(O2)) which is Low

4. S3 writes O2 = Integrity level of O2 is min(i(S3), i(O2)) which is i(S3) i.e. Very Low

5. S2 writes O3 = Integrity level of O3 is min(i(S2), i(O3)) which is i(O3) i.e. Very Low

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