Fuzzcheck (a structure-aware Rust fuzzer)

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  • fuzzcheck-rs

    Modular, structure-aware, and feedback-driven fuzzing engine for Rust functions

    Fuzzcheck is a structure-aware fuzzer for rust. "Fuzzing" means feeding large amounts of data into a program and checking for crashes (Fuzzcheck also checks to make sure that all the properties your program should uphold – e.g. a sorting algorithm applied to a list of n items should always return a list of n items – are upheld). Fuzzcheck is an "evolutionary" fuzzer – this means that it generates a set of random inputs, sees what percentage of the program is executed for each input, and keeps inputs which have high levels of percentage of program executed. It then "mutates" these inputs – whereas fuzzers such as AFL/Hongfuzz/etc mutate raw bytes in place (e.g. they swap bytes at different positions, or insert a random byte at a given position to generate inputs similar to the chosen "high coverage" inputs), Fuzzcheck works directly on the Rust types (so it might swap the order of two items in a vec, or randomly insert a new item). It's a really powerful tool for finding lots of bugs.

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  • trophy-case

    🏆 Collection of bugs uncovered by fuzzing Rust code

    If you have found any bugs with this tool, perhaps add them to the Rust fuzz trophy case?

  • hypothesis

    Hypothesis is a powerful, flexible, and easy to use library for property-based testing.

    The Hypothesis stateful testing code is somewhat self-contained, since it mostly builds on top of internal APIs that already existed.

  • diem

    Diem’s mission is to build a trusted and innovative financial network that empowers people and businesses around the world.

    I implemented this for proptest + cargo fuzz a while ago as well: https://github.com/diem/diem/blob/main/testsuite/diem-fuzzer/src/lib.rs

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