Add fuzzing skill for Copilot-assisted fuzzer development#3026
Merged
mattkur merged 2 commits intomicrosoft:mainfrom Mar 18, 2026
Merged
Add fuzzing skill for Copilot-assisted fuzzer development#3026mattkur merged 2 commits intomicrosoft:mainfrom
mattkur merged 2 commits intomicrosoft:mainfrom
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Why is this change being made? - No skill existed for running, optimizing, or debugging OpenVMM fuzzers - Copilot agents need structured guidance for fuzzing workflows What changed? - Added .github/skills/fuzzing/SKILL.md covering: - Prerequisites (Linux-only, aarch64 RUSTFLAGS, cargo-fuzz) - Running, building, and reproducing crashes - Debugging with lldb (batch mode, breakpoints, wrapper types) - Fuzzer optimization principles (entropy efficiency, simplification) - Multi-target parallel campaigns (-fork=N, -ignore_crashes) - Code coverage collection and filtering - Coverage scope rules per fuzzer - Coverage-guided improvement workflow How was the change tested? - N/A (documentation only)
smalis-msft
reviewed
Mar 17, 2026
smalis-msft
reviewed
Mar 17, 2026
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Pull request overview
Adds a new Copilot skill guide documenting the end-to-end workflow for developing and improving OpenVMM fuzzers (run/build/repro/debug, coverage collection, and campaign strategy).
Changes:
- Introduces a comprehensive fuzzing workflow guide under
.github/skills/fuzzing/. - Documents lldb-based crash debugging and practical Rust type inspection patterns.
- Adds guidance for coverage collection, filtering, and a coverage-guided improvement loop.
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| Everything from the main prerequisites, plus: | ||
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| - **llvm-tools**: `rustup +nightly component add llvm-tools` |
smalis-msft
reviewed
Mar 17, 2026
smalis-msft
reviewed
Mar 17, 2026
smalis-msft
reviewed
Mar 17, 2026
- Platform: 'Linux only' -> 'Linux or macOS' (libfuzzer doesn't support Windows) - Nightly: note sanitizers are the benefit, xtask fuzz works on stable - fuzz list: add +nightly for consistency with other commands - Debug builds: fix 'not yet supported' -> reference --dev flag - llvm-tools: note llvm-tools-preview as alternate component name - Coverage grep: use generic <primary-scope-path> placeholder - Corpus: add note that corpuses aren't committed to repo
smalis-msft
approved these changes
Mar 18, 2026
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Adds a new Copilot skill at
.github/skills/fuzzing/SKILL.mdcovering the full fuzzing workflow: running, building, debugging with lldb, optimization principles, multi-target parallel campaigns, coverage collection/filtering, coverage scope rules, and coverage-guided improvement workflow.