Add a second fuzzing engine alongside the existing libFuzzer/cargo-fuzz
setup. AFL++ runs with persistent mode (afl::fuzz! macro), LLVM plugins
(CmpLog, IJON), and a SymCC concolic companion for hybrid fuzzing.
- cargo-afl built from afl.rs with a patch for CARGO_AFL_DIR /
CARGO_AFL_LLVM_DIR env-var overrides
- AFL++ built with LLVM 22 plugins to match rust-nightly
- Persistent-mode fuzz targets in lib/fuzz-afl/
- --jobs N parallel fuzzing: main instance in foreground, secondaries
and SymCC companion as systemd transient units in a slice
- Ctrl+c / exit cleans up all background processes via slice stop
- AFL_AUTORESUME=1 for clean restarts after previous runs
- fuzz-clean-afl collects crashes from all instance directories
- Shared harness logic in lib/src/fuzz_harness.rs
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Replace debug_assert!(status == 0) with proper error returns. Per the
USB/IP protocol spec, the status field in these requests is "unused,
shall be set to 0" — a non-zero value indicates a non-compliant client
and should be rejected at the parsing boundary.
Also document fuzzer crash triage guidelines in CLAUDE.md.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
