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Add differential fuzzing expansion project for coreutils

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Sylvestre Ledru
2026-02-02 18:01:59 +01:00
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@@ -58,6 +58,33 @@ Summarizing that page, each project should include:
- Size (either ~175 or ~350 hours)
- Difficulty (easy, medium or hard)
## Expand differential fuzzing for coreutils
The [uutils/coreutils](https://github.com/uutils/coreutils) project has [some fuzzing infrastructure](https://github.com/uutils/coreutils/tree/main/fuzz/fuzz_targets) in place, but many utilities still lack comprehensive fuzz testing. This project focuses on expanding differential fuzzing coverage across coreutils to identify edge cases, improve robustness, and ensure compatibility with GNU coreutils.
Differential fuzzing compares the behavior of uutils implementations against GNU coreutils to automatically detect discrepancies and bugs that might be missed by traditional testing.
Key areas of work include:
* Creating new fuzz targets for utilities that currently lack them
* Implementing differential fuzzing harnesses that compare uutils vs GNU outputs
* Expanding existing fuzz targets to cover more code paths and options
* Setting up structured fuzzing campaigns with AFL++ and libFuzzer
* Integrating continuous fuzzing into CI/CD workflows
* Triaging and fixing bugs discovered through fuzzing
* Creating a corpus of interesting test inputs for regression testing
* Documenting fuzzing infrastructure and best practices
* Performance profiling of fuzz targets to maximize coverage
- **Difficulty**: Medium
- **Size**: ~175 hours
- **Mentors**: TBD
- **Required skills**:
- Rust
- Experience with fuzzing tools (AFL++, libFuzzer, cargo-fuzz)
- Understanding of differential testing methodologies
- Debugging and bug triage skills
- Familiarity with coreutils behavior
## Complete `findutils` GNU compatibility
The [uutils/findutils](https://github.com/uutils/findutils) project has made significant progress with [more than half](https://github.com/uutils/findutils-tracking/) of the GNU findutils and BFS tests passing. This project focuses on completing the remaining work to achieve full GNU compatibility and production readiness.