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# OSS-Fuzz: Continuous Fuzzing for Open Source Software
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[Fuzz testing] is a well-known technique for uncovering programming errors in
software. Many of these detectable errors, like [buffer overflow], can have
serious security implications. Google has found [thousands] of security
vulnerabilities and stability bugs by deploying [guided in-process fuzzing of
Chrome components], and we now want to share that service with the open source
community.
[Fuzz testing]: https://en.wikipedia.org/wiki/Fuzz_testing
[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],
OSS-Fuzz aims to make common open source software more secure and stable by
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
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++], and [Honggfuzz] fuzzing engines in
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combination with [Sanitizers], as well as [ClusterFuzz], a distributed fuzzer
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
[Sanitizers]: https://github.com/google/sanitizers
[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, Java/JVM, and JavaScript code. Other languages
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supported by [LLVM] may work too. OSS-Fuzz supports fuzzing x86_64 and i386
builds.
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[LLVM]: https://llvm.org
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## Overview
![OSS-Fuzz process diagram ](docs/images/process.png )
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## Documentation
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Read our [detailed documentation] to learn how to use OSS-Fuzz.
[detailed documentation]: https://google.github.io/oss-fuzz
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## Trophies
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As of February 2023, OSS-Fuzz has helped identify and fix over [8,900] vulnerabilities and [28,000] bugs across [850] projects.
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[8,900]: https://bugs.chromium.org/p/oss-fuzz/issues/list?q=status%3AFixed%2CVerified%20Type%3DBug-Security& can=1
[28,000]: https://bugs.chromium.org/p/oss-fuzz/issues/list?q=status%3AFixed%2CVerified%20Type%3DBug& can=1
[850]: https://github.com/google/oss-fuzz/tree/master/projects
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## Blog posts
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* 2016-12-01 - [Announcing OSS-Fuzz: Continuous fuzzing for open source software]
* 2017-05-08 - [OSS-Fuzz: Five months later, and rewarding projects]
* 2018-11-06 - [A New Chapter for OSS-Fuzz]
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* 2020-10-09 - [Fuzzing internships for Open Source Software]
* 2020-12-07 - [Improving open source security during the Google summer internship program]
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* 2021-03-10 - [Fuzzing Java in OSS-Fuzz]
* 2021-12-16 - [Improving OSS-Fuzz and Jazzer to catch Log4Shell]
* 2022-09-08 - [Fuzzing beyond memory corruption: Finding broader classes of vulnerabilities automatically]
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* 2023-02-01 - [Taking the next step: OSS-Fuzz in 2023]
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[Announcing OSS-Fuzz: Continuous fuzzing for open source software]: https://opensource.googleblog.com/2016/12/announcing-oss-fuzz-continuous-fuzzing.html
[OSS-Fuzz: Five months later, and rewarding projects]: https://opensource.googleblog.com/2017/05/oss-fuzz-five-months-later-and.html
[A New Chapter for OSS-Fuzz]: https://security.googleblog.com/2018/11/a-new-chapter-for-oss-fuzz.html
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[Fuzzing internships for Open Source Software]: https://security.googleblog.com/2020/10/fuzzing-internships-for-open-source.html
[Improving open source security during the Google summer internship program]: https://security.googleblog.com/2020/12/improving-open-source-security-during.html
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[Fuzzing Java in OSS-Fuzz]: https://security.googleblog.com/2021/03/fuzzing-java-in-oss-fuzz.html
[Improving OSS-Fuzz and Jazzer to catch Log4Shell]: https://security.googleblog.com/2021/12/improving-oss-fuzz-and-jazzer-to-catch.html
[Fuzzing beyond memory corruption: Finding broader classes of vulnerabilities automatically]: https://security.googleblog.com/2022/09/fuzzing-beyond-memory-corruption.html
[Taking the next step: OSS-Fuzz in 2023]: https://security.googleblog.com/2023/02/taking-next-step-oss-fuzz-in-2023.html