The process works like this:
- A maintainer of an open source project (or an outside volunteer) creates one or more fuzz targets and integrates them with the project’s build and test system.
- The project is accepted to OSS-Fuzz and the developer commits their build configurations.
- The OSS-Fuzz builder builds the project from the committed configs.
- The builder uploads the fuzz targets to the OSS-Fuzz GCS bucket.
- ClusterFuzz downloads the fuzz targets and begins to fuzz the projects.
- When Clusterfuzz finds a bug, it reports the issue automatically to the OSS-Fuzz issue tracker (example). (Why use a different tracker?)
- Project owners are CCed on the bug report.
- The project developer fixes the bug upstream and credits OSS-Fuzz for the discovery (the commit message should contain the string ‘Credit to OSS-Fuzz’).
Once the developer fixes the bug, ClusterFuzz automatically verifies the fix, adds a comment, and closes the issue (example). After the fix is verified or 90 days after reporting (whichever is earlier), the issue becomes public.