Files
alkcall/fuzz
glm-5.3-flash a99cc67e76 chore(release): 0.10.1 — the adoption-window ordering fix
Changelog entry for review 013's fix (4dbd4bc); version bump 0.10.0 →
0.10.1 (patch — private fix surface, no API or wire-format change).

Verification: semver-checks 196 pass (no semver update required);
cargo test 700 + 724 (--all-features) pass; clippy --all-targets
--all-features -D warnings, fmt --check, wasm32-unknown-unknown check +
clippy, fuzz corpus replay (5/5), and cargo publish --dry-run clean.
Downstream gate: alkgit's flaking row re-verified green under
multi-process load against 4dbd4bc.
2026-10-22 05:28:12 +00:00
..

alkcall fuzzing

libFuzzer targets for alkcall's wire formats (see docs/research/fuzzing.md for the full rationale and campaign plan).

Layout

  • fuzz_targets/ — one binary per target; thin fuzz_target! wrappers.
  • shared/ — the invariant logic, as a plain library so normal cargo test (stable toolchain) can replay the committed corpora through the same invariants (fuzz/shared/src/*.rs #[cfg(test)] modules; quinn's CI pattern). The fuzz binaries are nightly-only; the shared crate is stable-clean.
  • corpus/<target>/ — committed hand-made seeds (regenerate with python3 fuzz/gen_fuzz_seeds.py from the repo root). Grown corpora and artifacts are gitignored.
  • run-detached.sh — mandatory runner for agent sessions: wraps cargo fuzz run in setsid + nohup + log redirection so an OOM in a target can never take down the agent host (research doc §7.6).
  • json.dict — JSON token dictionary for the envelope targets.

Targets

Target Drives Invariants
chunk_header parse_header / write_header (channels/wire.rs) no-panic; round-trip identity; TooLarge iff length > MAX_CHUNK_LEN; consumption accounting (8 bytes); input never mutated
envelope_frame FrameFramedReader::new(Cursor).read_frame() on a current-thread runtime no-panic; never allocates > MAX_FRAME_SIZE; clean FrameError on truncation/oversize/zero-length; exact consumption; structural write_frame round-trip

Commands

cargo fuzz build and cargo fuzz run must be executed with fuzz/ (or deeper) as the working directory so rustup selects the pinned nightly toolchain — the detached runner handles that itself.

# build (nightly, pinned by rust-toolchain.toml inside fuzz/; run from fuzz/)
cargo fuzz build

# agent sessions: detached campaign (never foreground; CWD-independent)
FUZZ_RUNTIME_SECS=600 fuzz/run-detached.sh chunk_header
FUZZ_RUNTIME_SECS=600 fuzz/run-detached.sh envelope_frame -max_len=65536 -dict=json.dict

# corpus replay through the invariants (stable toolchain, no nightly)
cargo test --manifest-path fuzz/shared/Cargo.toml

# coverage
cargo fuzz coverage <target>

The fuzz workspace is excluded from the main workspace and from the published package (exclude in the root Cargo.toml); it pins its own nightly toolchain via rust-toolchain.toml and does not affect the crate's stable MSRV.