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Interview question · Systems, OS & Memory Safety

How does coverage-guided fuzzing work, how do you write a good fuzz harness, and what do you do with the crashes?

Random input finds shallow bugs. Coverage feedback, sanitizers and a harness that reaches the parser are what make fuzzing find the deep ones. The interview checks all three, plus what happens after the crash.

mediumEssentialNewPreparation tags: Google, Microsoft, AppleUpdated Nov 2026

Random input finds shallow bugs. Coverage feedback, sanitizers and a harness that reaches the parser are what make fuzzing find the deep ones. The interview checks all three, plus what happens after the crash.

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What would you say before reading the answer?

  1. 01 State the assumptions your answer depends on.
  2. 02 Explain the mechanism and choose a control.
  3. 03 Name a condition that would change your decision.

The worked answer includes an approach, scoring criteria and follow-up questions. Compare the reasoning with your own.

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What if · the follow-ups in this answer

The answer works through 6 follow-ups like an interviewer would

Your team adds coverage-guided fuzzing to a protocol parser and gets 300 crashes overnight.

  1. How does coverage-guided fuzzing work?
  2. Why use sanitizers while fuzzing?
  3. How do you handle 300 crashes?
  4. How do you prioritise the unique bugs?
  5. How do you keep the gains?
  6. How would you run the fuzzing programme?

Each rung has a nudge, a model answer, the principle that carries over and the weak answer to avoid. Premium opens every answer and ladder.

UP NEXT ON YOUR JOURNEY
Next in this trackStatic versus dynamic analysis in reverse engineering: what do disassemblers, decompilers and debuggers each show you?Next in this trackYou are given a stripped native binary and asked whether it handles a secret safely. How do you approach it?Next in this trackIn an authorised assessment you bypass an app's anti-debugging and integrity checks. What does that prove?
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