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title: OSS-Fuzz |
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--- |
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# OSS-Fuzz |
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[Fuzz testing] is a well-known technique for uncovering programming errors in |
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software. Many of these detectable errors, like [buffer overflow], can have |
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serious security implications. Google has found [thousands] of security |
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vulnerabilities and stability bugs by deploying [guided in-process fuzzing of |
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Chrome components], and we now want to share that service with the open source |
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community. |
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[Fuzz testing]: https://en.wikipedia.org/wiki/Fuzz_testing |
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[buffer overflow]: https://en.wikipedia.org/wiki/Buffer_overflow |
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[thousands]: https://bugs.chromium.org/p/chromium/issues/list?q=label%3AStability-LibFuzzer%2CStability-AFL%20-status%3ADuplicate%2CWontFix&can=1 |
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[guided in-process fuzzing of Chrome components]: https://security.googleblog.com/2016/08/guided-in-process-fuzzing-of-chrome.html |
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In cooperation with the [Core Infrastructure Initiative] and the [OpenSSF], |
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OSS-Fuzz aims to make common open source software more secure and stable by |
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combining modern fuzzing techniques with scalable, distributed execution. |
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Projects that do not qualify for OSS-Fuzz (e.g. closed source) can run their own |
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instances of [ClusterFuzz] or [ClusterFuzzLite]. |
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[Core Infrastructure Initiative]: https://www.coreinfrastructure.org/ |
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[OpenSSF]: https://www.openssf.org/ |
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We support the [libFuzzer], [AFL++], [Honggfuzz], and [Centipede] fuzzing engines in |
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combination with [Sanitizers], as well as [ClusterFuzz], a distributed fuzzer |
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execution environment and reporting tool. |
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[libFuzzer]: https://llvm.org/docs/LibFuzzer.html |
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[AFL++]: https://github.com/AFLplusplus/AFLplusplus |
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[Honggfuzz]: https://github.com/google/honggfuzz |
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[Centipede]: https://github.com/google/centipede |
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[Sanitizers]: https://github.com/google/sanitizers |
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[ClusterFuzz]: https://github.com/google/clusterfuzz |
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[ClusterFuzzLite]: https://google.github.io/clusterfuzzlite/ |
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Currently, OSS-Fuzz supports C/C++, Rust, Go, Python and Java/JVM code. Other |
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languages supported by [LLVM] may work too. OSS-Fuzz supports fuzzing x86_64 |
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and i386 builds. |
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[LLVM]: https://llvm.org |
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## Project history |
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OSS-Fuzz was launched in 2016 in response to the |
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[Heartbleed] vulnerability, discovered in [OpenSSL], one of the |
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most popular open source projects for encrypting web traffic. The vulnerability |
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had the potential to affect almost every internet user, yet was caused by a |
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relatively simple memory buffer overflow bug that could have been detected by |
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fuzzing—that is, by running the code on randomized inputs to intentionally cause |
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unexpected behaviors or crashes. At the time, though, fuzzing |
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was not widely used and was cumbersome for developers, requiring extensive |
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manual effort. |
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Google created OSS-Fuzz to fill this gap: it's a free service that runs fuzzers |
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for open source projects and privately alerts developers to the bugs detected. |
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Since its launch, OSS-Fuzz has become a critical service for the open source |
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community, growing beyond C/C++ to |
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detect problems in memory-safe languages such as Go, Rust, and Python. |
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[Heartbleed]: https://heartbleed.com/ |
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[OpenSSL]: https://www.openssl.org/ |
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## Learn more about fuzzing |
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This documentation describes how to use OSS-Fuzz service for your open source |
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project. To learn more about fuzzing in general, we recommend reading [libFuzzer |
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tutorial] and the other docs in [google/fuzzing] repository. These and some |
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other resources are listed on the [useful links] page. |
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[google/fuzzing]: https://github.com/google/fuzzing/tree/master/docs |
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[libFuzzer tutorial]: https://github.com/google/fuzzing/blob/master/tutorial/libFuzzerTutorial.md |
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[useful links]: {{ site.baseurl }}/reference/useful-links/#tutorials |
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## Trophies |
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As of August 2023, OSS-Fuzz has helped identify and fix over [10,000] vulnerabilities and [36,000] bugs across [1,000] projects. |
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[10,000]: https://bugs.chromium.org/p/oss-fuzz/issues/list?q=Type%3DBug-Security%20label%3Aclusterfuzz%20-status%3ADuplicate%2CWontFix&can=1 |
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[36,000]: https://bugs.chromium.org/p/oss-fuzz/issues/list?q=Type%3DBug%20label%3Aclusterfuzz%20-status%3ADuplicate%2CWontFix&can=1 |
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[1,000]: https://github.com/google/oss-fuzz/tree/master/projects |
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