Individual skill
libfuzzer
Use when asked to build, run, or triage a coverage-guided C/C++ fuzz campaign on the libFuzzer or AFL++ engine. Not for harness design: use fuzz-harness-writing.
.devin/skills/libfuzzer/SKILL.md
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- Not checked yet
- Last checked
- Nov 4, 2026
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- Repository stars (not skill ratings)
- 55
- Repository last updated
- Sep 28, 2026
- License
- Apache-2.0
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# libFuzzer and AFL++
## Contract
| Field | Bound contract |
|---|---|
| Trigger | User needs to build, run, tune, or triage a coverage-guided C/C++ fuzzing campaign or `LLVMFuzzerTestOneInput` harness on the libFuzzer engine (default) or the AFL++ engine (afl mode). |
| Authority | Human-gated: in afl mode, request explicit user approval before a package installation or a Docker image pull; otherwise reversible local: writes only named fuzzing artifacts (binary, corpus and output directories, crash files, logs); rollback is deleting them and killing campaign processes. Kernel-tuning steps that need a reboot or degrade OS security are out of scope. No remote mutation. |
| Side effect | Local write to a compiled fuzzing binary, its corpus or output directory, log files, and any crash artifacts written by the target; afl mode may run a short-lived Docker container. |
| Done | The instrumented binary runs against its corpus and any crash artifact reproduces in the same target with identical sanitizer output or signal. |
## Inputs
- Required: Engine: `libfuzzer` (default) or `afl`.