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Suppose I have a ton of test cases and my target is closed-source. Well, I need to know which test cases discover new path in the execution of my target and which are duplicated. I know I have to use DBI frameworks such as DynamoRIO, Intel Pin and others. But, I cannot figure out how to use them, in the other words, I got confused to how I should save trace map and check them for a ton of test cases!?

Another question is, how can we figure out a test case is good and interesting during fuzzing test? Just discovering new path?

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If you want to discover new test cases (or check that a test case is valuable) on a binary, the good way to go is to use tools such as KLEE (see this small tutorial).

The point is too use symbolic execution to try to cover a maximum of the possible execution paths which are in the binary.

So, I would advise you to take a deeper look at the symbolic execution approach.

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    Although symbolic execution is one way of measuring the value of test cases, it is not the only one. For example, coverage measures are also a valid approach (that fits OPs intentions of using a dynamic instrumentation tools). – NirIzr Jul 22 '18 at 19:39
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    AFL comes to mind ... – 0xC0000022L Nov 20 '18 at 9:32
  • yes, definitely! – perror Nov 20 '18 at 10:39

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