{"abstract":"No-match decisions ignore the supplied default.","category":"Configuration","checks":8,"contract":"Return deny if any applicable explicit deny, allow if at least one applicable allow, otherwise the provided default. Ignore disabled and nonmatching rules. Unknown effects do not grant access.","contract_signature":"rules, resource, default","evaluation_group":"xt-policy-combine","failed_approach":"The attempted repair substitutes return True. Fixture 1 still yields True instead of False.","family":"xt-policy-combine-default-policy","id":"FA-9801","implementations":{"attempt":{"sha256":"0758e9d1cf44ca0bbb03e53db5de17ee4590b35ee2404ef86cfbd75aa328b51c","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(rules, resource, default):\n    effects = [effect for pattern, effect, enabled in rules if enabled and pattern in [resource, '*']]\n    if 'deny' in effects: return False\n    if 'allow' in effects: return True\n    return True\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('fixture 1', solve([], 'a', False), False)\ncheck('fixture 2', solve([], 'a', True), True)\ncheck('fixture 3', solve([('a', 'allow', True)], 'a', False), True)\ncheck('fixture 4', solve([('a', 'deny', True), ('a', 'allow', True)], 'a', True), False)\ncheck('fixture 5', solve([('a', 'deny', False)], 'a', True), True)\ncheck('fixture 6', solve([('b', 'allow', True)], 'a', False), False)\ncheck('fixture 7', solve([('*', 'allow', True)], 'a', False), True)\ncheck('fixture 8', solve([('a', 'unknown', True)], 'a', False), False)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"broken":{"sha256":"ebcebd6bb276f6cb893226b112ca86453147cacd5e04f99cc10e6aebab14674a","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(rules, resource, default):\n    effects = [effect for pattern, effect, enabled in rules if enabled and pattern in [resource, '*']]\n    if 'deny' in effects: return False\n    if 'allow' in effects: return True\n    return False\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('fixture 1', solve([], 'a', False), False)\ncheck('fixture 2', solve([], 'a', True), True)\ncheck('fixture 3', solve([('a', 'allow', True)], 'a', False), True)\ncheck('fixture 4', solve([('a', 'deny', True), ('a', 'allow', True)], 'a', True), False)\ncheck('fixture 5', solve([('a', 'deny', False)], 'a', True), True)\ncheck('fixture 6', solve([('b', 'allow', True)], 'a', False), False)\ncheck('fixture 7', solve([('*', 'allow', True)], 'a', False), True)\ncheck('fixture 8', solve([('a', 'unknown', True)], 'a', False), False)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"}},"limitations":" This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.","method":"Deterministic executable model with adversarial boundary fixtures.","provenance":{"created_by":"Failure Map","dependencies":"Python standard library","family":"xt-policy-combine-default-policy","generated_at":"2026-09-29T14:38:33.242105+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"An offline model of access policy decision combination, suitable for testing build and release tooling without external services.","root_cause":"The implementation substitutes return False for return default, so no-match decisions ignore the supplied default.","sha256":"22a9112ecd8774f2571e3bc483c1b5f3f89e1134b5071cf843842238f591ffaa","title":"Access policy decision combination: No-match decisions ignore the supplied default · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verified":true,"visibility":"public","verification":{"attempt":{"elapsed_ms":39.214,"exit_code":1,"observations":[{"actual":true,"check":"fixture 1","expected":false,"passed":false},{"actual":true,"check":"fixture 2","expected":true,"passed":true},{"actual":true,"check":"fixture 3","expected":true,"passed":true},{"actual":false,"check":"fixture 4","expected":false,"passed":true},{"actual":true,"check":"fixture 5","expected":true,"passed":true},{"actual":true,"check":"fixture 6","expected":false,"passed":false},{"actual":true,"check":"fixture 7","expected":true,"passed":true},{"actual":true,"check":"fixture 8","expected":false,"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": true, \"expected\": false, \"passed\": false}, {\"check\": \"fixture 2\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"fixture 5\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"fixture 6\", \"actual\": true, \"expected\": false, \"passed\": false}, {\"check\": \"fixture 7\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"fixture 8\", \"actual\": true, \"expected\": false, \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":40.347,"exit_code":1,"observations":[{"actual":false,"check":"fixture 1","expected":false,"passed":true},{"actual":false,"check":"fixture 2","expected":true,"passed":false},{"actual":true,"check":"fixture 3","expected":true,"passed":true},{"actual":false,"check":"fixture 4","expected":false,"passed":true},{"actual":false,"check":"fixture 5","expected":true,"passed":false},{"actual":false,"check":"fixture 6","expected":false,"passed":true},{"actual":true,"check":"fixture 7","expected":true,"passed":true},{"actual":false,"check":"fixture 8","expected":false,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"fixture 2\", \"actual\": false, \"expected\": true, \"passed\": false}, {\"check\": \"fixture 3\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"fixture 5\", \"actual\": false, \"expected\": true, \"passed\": false}, {\"check\": \"fixture 6\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"fixture 7\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"fixture 8\", \"actual\": false, \"expected\": false, \"passed\": true}], \"passed\": false}\n"}},"member_only":{"stages":["fixed"],"fields":["implementations.fixed","verification.fixed","harness","repair"],"note":"The verified repair, its recorded checks, the repair description, and the scoring harness are available to members."}}