coverage-analysis

Coverage analysis is essential for understanding which parts of your code are exercised during fuzzing. It helps identify fuzzing blockers like magic value checks and tracks the effectiveness of harness improvements over time.

Coverage is a proxy for fuzzer capability and performance. While coverage is not ideal for measuring fuzzer performance in absolute terms, it reliably indicates whether your harness works effectively in a given setup.

| Coverage instrumentation | Compiler flags that track which code paths are executed | | Corpus coverage | Coverage achieved by running all test cases in a fuzzing corpus | | Magic value checks | Hard-to-discover conditional checks that block fuzzer progress | | Coverage-guided fuzzing | Fuzzing strategy that prioritizes inputs that discover new code paths |