fix(detector): detect partial namespace replay

kernelguard.py

@@ -2462,6 +2462,118 @@ def _has_ver(expr: ast.AST | None) -> bool:
     return []
 
 
+def detect_partial_namespace_replay(code: str | SubmissionFacts) -> list[dict]:
+    """Pattern: functools.partial binds a namespace used as replay state."""
+    facts = ensure_submission_facts(code)
+    tree = facts.ast_tree
+    if tree is None:
+        return []
+    entrypoint_name = entrypoint_label(facts.entrypoint_name)
+
+    functions = {
+        stmt.name: stmt
+        for stmt in tree.body
+        if isinstance(stmt, ast.FunctionDef)
+    }
+
+    def _is_partial(expr: ast.AST | None) -> bool:
+        return (
+            isinstance(expr, ast.Name) and expr.id == "partial"
+        ) or (
+            isinstance(expr, ast.Attribute)
+            and expr.attr == "partial"
+            and isinstance(expr.value, ast.Name)
+            and expr.value.id == "functools"
+        )
+
+    def _is_namespace_none(expr: ast.AST | None) -> bool:
+        return (
+            isinstance(expr, ast.Call)
+            and isinstance(expr.func, ast.Name)
+            and expr.func.id == "SimpleNamespace"
+            and any(
+                kw.arg is not None
+                and isinstance(kw.value, ast.Constant)
+                and kw.value.value is None
+                for kw in expr.keywords
+            )
+        )
+
+    partials = []
+    for stmt in tree.body:
+        if not (
+            isinstance(stmt, ast.Assign)
+            and any(isinstance(target, ast.Name) and is_entrypoint_name(target.id) for target in stmt.targets)
+            and isinstance(stmt.value, ast.Call)
+            and _is_partial(stmt.value.func)
+            and len(stmt.value.args) >= 2
+            and isinstance(stmt.value.args[0], ast.Name)
+            and stmt.value.args[0].id in functions
+            and _is_namespace_none(stmt.value.args[1])
+        ):
+            continue
+        partials.append(functions[stmt.value.args[0].id])
+
+    for fn in partials:
+        if len(fn.args.args) < 2:
+            continue
+        state_param = fn.args.args[0].arg
+        data_params = {arg.arg for arg in fn.args.args[1:]}
+        data_params.update(arg.arg for arg in fn.args.posonlyargs)
+        data_params.update(arg.arg for arg in fn.args.kwonlyargs)
+
+        mutated = {
+            target.attr
+            for stmt in ast.walk(fn)
+            if isinstance(stmt, ast.Assign)
+            and bool(_expr_names(stmt.value) & data_params)
+            for target in stmt.targets
+            if isinstance(target, ast.Attribute)
+            and isinstance(target.value, ast.Name)
+            and target.value.id == state_param
+        }
+        if not mutated:
+            continue
+
+        for child in ast.walk(fn):
+            if not isinstance(child, ast.If):
+                continue
+            if _expr_names(child.test) & data_params:
+                continue
+            tested = {
+                expr.attr
+                for expr in ast.walk(child.test)
+                if isinstance(expr, ast.Attribute)
+                and isinstance(expr.value, ast.Name)
+                and expr.value.id == state_param
+                and expr.attr in mutated
+            }
+            if not tested:
+                continue
+            if _body_has_calls(child.body):
+                continue
+            returned = {
+                stmt.value.attr
+                for stmt in child.body
+                if isinstance(stmt, ast.Return)
+                and isinstance(stmt.value, ast.Attribute)
+                and isinstance(stmt.value.value, ast.Name)
+                and stmt.value.value.id == state_param
+                and stmt.value.attr in mutated
+            }
+            if tested & returned:
+                return [{
+                    "pattern": "PARTIAL_NAMESPACE_REPLAY",
+                    "severity": "critical",
+                    "evidence": (
+                        f"{entrypoint_name} replays output through a "
+                        "SimpleNamespace bound by partial"
+                    ),
+                }]
+
+    return []
+
+
 RE_OBJECT_ID_DATA = re.compile(r"\bdata_id\s*=\s*id\s*\(\s*data\s*\)")
 RE_RESULT_BANK_SET = re.compile(r"_superbatch_results\s*\[\s*(?:did|data_id)\s*\]\s*=")
 RE_RESULT_BANK_RETURN = re.compile(r"return\s+_superbatch_results\s*\[\s*data_id\s*\]")
@@ -3479,6 +3591,10 @@ class RulePolicy:
         "LAST_CALL_REPLAY", "result_reuse", "hard", AUTO_FILTER, (),
         AMD_MANUAL_LAST_CALL_REPLAY_FIXTURES, "keep",
     ),
+    "PARTIAL_NAMESPACE_REPLAY": RulePolicy(
+        "PARTIAL_NAMESPACE_REPLAY", "result_reuse", "hard", AUTO_FILTER, (),
+        (), "keep",
+    ),
     "SHAPE_OUTPUT_REPLAY": RulePolicy(
         "SHAPE_OUTPUT_REPLAY", "result_reuse", "hard", AUTO_FILTER, (),
         AMD_PACKAGE_SHAPE_REPLAY_FIXTURES, "keep",
@@ -3762,6 +3878,7 @@ def support_only_patterns(matched_patterns: list[dict]) -> bool:
     detect_decode_mm_ref,
     detect_result_caching,
     detect_last_call_replay,
+    detect_partial_namespace_replay,
     detect_shape_output_replay,
     detect_timed_input_replay,
     detect_cuda_graph_replay,
@@ -3800,6 +3917,7 @@ def support_only_patterns(matched_patterns: list[dict]) -> bool:
     ("decode_mm_ref", detect_decode_mm_ref),
     ("result_caching", detect_result_caching),
     ("last_call_replay", detect_last_call_replay),
+    ("partial_namespace_replay", detect_partial_namespace_replay),
     ("shape_output_replay", detect_shape_output_replay),
     ("timed_input_replay", detect_timed_input_replay),
     ("cuda_graph_replay", detect_cuda_graph_replay),
@@ -4696,7 +4814,7 @@ def _worker_parquet(args: tuple) -> dict:
     "EVALUATOR_EXPLOIT", "HARNESS_RUNTIME_PATCHING", "MODULE_MUTATION", "GLOBALS_MUTATION", "CODE_REPLACEMENT",
     "FRAME_WALK_ACCESS", "FRAME_WALK_MUTATION", "SYS_MODULES_ACCESS", "GLOBALS_ACCESS", "CODE_ACCESS",
     "TRUSTED_MODULE_IMPORT",
-    "OUTPUT_REPLAY_CACHE", "LAST_CALL_REPLAY", "SHAPE_OUTPUT_REPLAY", "TIMED_INPUT_REPLAY", "CONFIG_CACHE_EXPLOIT", "POINTER_REPLAY", "RESULT_BANK_REPLAY", "PREPROCESS_CACHE", "WORKSPACE_CACHE",
+    "OUTPUT_REPLAY_CACHE", "LAST_CALL_REPLAY", "PARTIAL_NAMESPACE_REPLAY", "SHAPE_OUTPUT_REPLAY", "TIMED_INPUT_REPLAY", "CONFIG_CACHE_EXPLOIT", "POINTER_REPLAY", "RESULT_BANK_REPLAY", "PREPROCESS_CACHE", "WORKSPACE_CACHE",
     "RUNNER_PLAN_CACHE", "CUDA_GRAPH_PYTHON", "CUDA_GRAPH_REPLAY",
     "TIMER_MONKEYPATCH", "FAKE_BENCHMARK_EMIT", "STDIO_REDIRECT", "UNSYNC_MULTISTREAM", "CUDA_EVENT_DISABLE_TIMING",
     "SCALED_MM_REF", "DECODE_MM_REF", "SILENT_FALLBACK", "REFERENCE_PRECOMPUTE_REPLAY", "TORCH_COMPILE_CACHE",