MONGOCRYPT-834 fuzzing for oss-fuzz#1152
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kevinAlbs
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Apr 28, 2026
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Background
Libmongocrypt will be added to OSS-Fuzz for continuous fuzz testing. On our end we only have to provide the fuzzing entry point:
LLVMFuzzerTestOneInputwhich is linked into the fuzzing binary.Design
The fuzzing engine which accepts binary inputs uses the first byte to decide on the target state. It provides some defaults (local encryption keys, etc.) until the state machine is ready to accept input and feeds the fuzzer generated data. A corpus of starting data derived from test inputs improves fuzzing efficiency.
Coverage
The fuzzing added here covers 14.33% of libmongocrypt's functions.