57 lines
4.2 KiB
Markdown
57 lines
4.2 KiB
Markdown
# alkstore fuzzing
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libFuzzer targets for alkstore's parse/codec surfaces (see
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`docs/research/fuzzing.md` for the full rationale and campaign plan).
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## Layout
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- `fuzz_targets/` — one binary per target; thin `fuzz_target!` wrappers
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(land with the wave-7 target tasks).
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- `shared/` — the invariant logic, as a plain library so normal
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`cargo test` (stable toolchain) can replay the committed corpora
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through the same invariants (`fuzz/shared/src/*.rs` `#[cfg(test)]`
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modules; quinn's CI pattern). The fuzz binaries are nightly-only;
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the shared crate is stable-clean. It consumes alkstore's public API
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only and must never become a dependency of any workspace crate.
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- `corpus/<target>/` — committed hand-made seeds (regenerate with
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`python3 fuzz/gen_fuzz_seeds.py` from the repo root). Grown corpora
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and artifacts are gitignored; each target task adds its `!`-negation
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line when its corpus lands.
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- `run-detached.sh` — mandatory runner for agent sessions: wraps
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`cargo fuzz run` in `setsid` + `nohup` + log redirection so an OOM
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in a target can never take down the agent host (research doc §5).
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- `json.dict` — JSON token dictionary for the structured targets.
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- `gen_fuzz_seeds.py` — deterministic seed generator (quiche pattern).
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## Targets
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| Target | Drives | Invariants |
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| `payload_codec` | `encode_payload` / `payload_as::<T>` (`alkstore/src/payload.rs`) | no-panic on any byte sequence; every decode failure typed `Error::Codec`; deep nesting loud at serde_json's recursion limit; `Value` round-trip (serde_json canonicalization pinned); typed round-trip for a representative payload set |
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| `every_parse` | the three `parse_every_interval` implementations (differential, through the engines' `#[doc(hidden)]` re-exports) + each engine's `skip_forward` boundary arithmetic | no-panic on any UTF-8-lossy string (each parser, each boundary path); typed rejection (`Error::InvalidSpec` on pg/mem, the substrate's error under its mapping on SQLite); three-way agreement on the Ok/Err partition and the `Ok` interval value (error identity not pinned — the SQLite `Result<i64, String>` vs `InvalidSpec` asymmetry is known); overflow posture: `skip_forward` over adversarial `(next_fire_at, now, interval)` triples rejects-or-saturates, never wraps or panics; the `n <= 0` and giant-`n` arms (leading zeros, digit overflow at exactly `i64::MAX/86400`, positive-zero rejection) |
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| `name_validation` | `validate_name` / `validate_shared_name` / `validate_local_name` (`alkstore/src/validation.rs`) | no-panic on any byte sequence (lossy-decoded and `arbitrary`-structured strings); deterministic accept/reject (double-invocation-pinned); rejection only via the typed taxonomy — `Error::InvalidName` for empty/whitespace-only on both kinds, `Error::ReservedName` for the leading byte-exact `__alkstore_` prefix on the shared kind only (the local kind takes the non-empty rule only, so a leading reserved prefix is legal there); the reserved-prefix rule exact in every casing/boundary form (casing deviations, missing trailing underscore, embedded and whitespace-led forms accept); the rejection carries the supplied name verbatim (names are not trimmed); verdict-class length-independence across the probed neighborhoods (0↔1, 11↔12, 63↔64, 4095↔4096, 65536) — no length cap is pinned (ADR-008 §4), so no length is ever a rejection cause |
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## Commands
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`cargo fuzz build` and `cargo fuzz run` must be executed with `fuzz/`
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(or deeper) as the working directory so rustup selects the pinned
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nightly toolchain — the detached runner handles that itself.
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```sh
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# build (nightly, pinned by rust-toolchain.toml inside fuzz/; run from fuzz/)
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cargo fuzz build
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# agent sessions: detached campaign (never foreground; CWD-independent)
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FUZZ_RUNTIME_SECS=600 fuzz/run-detached.sh <target> [extra libfuzzer args...]
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# corpus replay through the invariants (stable toolchain, no nightly)
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cargo test --manifest-path fuzz/shared/Cargo.toml
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# coverage
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cargo fuzz coverage <target>
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```
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The fuzz workspace is excluded from the main workspace (`exclude` in
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the root `Cargo.toml`); it pins its own nightly toolchain via
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`rust-toolchain.toml` and does not affect the root workspace's stable
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toolchain or MSRV. |