Publish Layerfault deep challenge LF-CH-SER-0018

CHALLENGE_ORACLE.json

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+{
+  "attack_surface": [
+    "serialization-mutation"
+  ],
+  "control_type": "negative",
+  "corpus_id": "LF-CH-SER-0018",
+  "difficulty": "hard",
+  "expected_decision": "PASS",
+  "ground_truth": "synthetic-generated",
+  "layerfault_rule_expectations": {
+    "candidate_rules": [],
+    "expected_rules": [],
+    "must_not_rules": [
+      "LF-PICKLE-DANGEROUS-GLOBAL"
+    ]
+  },
+  "oracle_ids": [
+    "LF-ORACLE-SER-0018"
+  ],
+  "related_cases": [],
+  "repo_name": "serialization-doc-example-control",
+  "safe_fixture": true,
+  "schema": 2,
+  "severity": "informational",
+  "techniques": [
+    "control"
+  ],
+  "transformations": []
+}

FIXTURE_LAYOUT.json

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+{
+  "artifacts": [
+    "SECURITY.md"
+  ],
+  "family": "serialization",
+  "note": "All content is synthetic and inert. Do not treat this as a production model.",
+  "repo_name": "serialization-doc-example-control"
+}

LAYERFAULT_CORPUS.json

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+{
+  "candidate_rules": [],
+  "challenge": {
+    "attack_surface": [
+      "serialization-mutation"
+    ],
+    "control_type": "negative",
+    "difficulty": "hard",
+    "expected_decision": "PASS",
+    "oracle_ids": [
+      "LF-ORACLE-SER-0018"
+    ],
+    "related_cases": [],
+    "severity": "informational",
+    "techniques": [
+      "control"
+    ],
+    "transformations": []
+  },
+  "corpus_id": "LF-CH-SER-0018",
+  "description": "Serialization doc example control.",
+  "expected_rules": [],
+  "generator": "challenges.generate_challenge",
+  "ground_truth": "synthetic-generated",
+  "must_not_rules": [
+    "LF-PICKLE-DANGEROUS-GLOBAL"
+  ],
+  "repo_name": "serialization-doc-example-control",
+  "repo_type": "model",
+  "safe_fixture": true,
+  "safety": "inert/canary-only",
+  "schema": 1,
+  "validation": {
+    "kind": "verify-package",
+    "target": "."
+  }
+}

README.md

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+---
+license: apache-2.0
+tags:
+- layerfault
+- security-research
+- model-security
+- synthetic
+- adversarial-testing
+extra_gated_prompt: >-
+  This repository is a synthetic security-test artifact from the Layerfault
+  corpus. It intentionally contains adversarial characteristics (e.g.
+  suspicious pickle opcodes, executable-format smuggling, prompt-injection
+  strings) designed to exercise security scanner detection rules. It is
+  **not** a usable ML model and must never be loaded or executed outside an
+  isolated scanner-testing environment. By accepting, you confirm you
+  understand this repository is a test fixture, not production model
+  weights.
+extra_gated_button_content: I understand this is a security test fixture and accept the risk
+gated: auto
+---
+
+# serialization-doc-example-control
+
+> **SECURITY TEST ARTIFACT: DO NOT USE AS A PRODUCTION MODEL**
+
+This repository is part of the Layerfault synthetic security corpus.
+It is deliberately constructed to contain security-relevant characteristics for scanner testing.
+
+**Corpus ID:** `LF-CH-SER-0018`
+
+## Purpose
+
+Serialization doc example control.
+
+## Direct expected Layerfault rules
+
+- None; this repository is a control/comparison input.
+
+## Candidate rules
+
+These are deliberately plausible targets that remain marked as candidates until the exact
+Layerfault build used for certification confirms them.
+
+- None
+
+## Negative-control rules
+
+These should remain silent for this corpus item.
+
+- `LF-PICKLE-DANGEROUS-GLOBAL`
+
+## Safety
+
+The corpus uses fake secrets, loopback/`.invalid` network destinations, harmless marker output,
+and synthetic model behavior only. It is intended for static scanning and isolated security testing.
+
+## Challenge classification
+
+- Severity: **informational**
+- Difficulty: **hard**
+- Expected admission decision: **PASS**
+- Control type: **negative**
+- Attack surface: serialization-mutation
+- Techniques: control
+- Transformations: none
+
+### Ground-truth oracle IDs
+
+- `LF-ORACLE-SER-0018`
+
+These oracle IDs describe synthetic ground truth. They do not claim that a
+matching Layerfault detector already exists. A challenge may intentionally expose
+a scanner blind spot and remain unmapped until the detector is implemented.

SECURITY.md

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+Defensive documentation: pickle GLOBAL builtins.eval is dangerous. No pickle stream is present.

SHA256SUMS.json

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+[
+  {
+    "path": "CHALLENGE_ORACLE.json",
+    "sha256": "8f9fc35482ada0592e479854d5a38416cacf43490a302a72048e492aa697febd",
+    "size": 632
+  },
+  {
+    "path": "FIXTURE_LAYOUT.json",
+    "sha256": "f182d23522313092379120d0aae0f880f72d473ca4f2007e82ed0a1f1f772c15",
+    "size": 214
+  },
+  {
+    "path": "LAYERFAULT_CORPUS.json",
+    "sha256": "8e20bc7bbe4e2422df7b0aaf8a14e07d13c4cd1ff19b1874c23f5c77983fd0fb",
+    "size": 864
+  },
+  {
+    "path": "README.md",
+    "sha256": "5fb48d6d145b3e4779c0163ea02d75034bdadcad8bc9946aa8326bf235dc505f",
+    "size": 2225
+  },
+  {
+    "path": "SECURITY.md",
+    "sha256": "a6bd816e793d331d0c5d609aa8ac978a0ecca9dc5646f1bef197019c25aa4062",
+    "size": 96
+  }
+]