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reproduce.py

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+#!/usr/bin/env python3
+from __future__ import annotations
+
+import argparse
+import json
+import time
+from pathlib import Path
+
+from google.protobuf import field_mask_pb2
+
+
+ROOT = Path(__file__).resolve().parent
+ARTIFACTS = ROOT / "artifacts"
+
+
+def vmhwm_kb() -> int | None:
+    with open("/proc/self/status", "r", encoding="utf-8", errors="ignore") as fh:
+        for line in fh:
+            if line.startswith("VmHWM:"):
+                return int(line.split()[1])
+    return None
+
+
+def parse_one(path: Path) -> dict:
+    start = time.time()
+    before = vmhwm_kb()
+    msg = field_mask_pb2.FieldMask()
+    msg.ParseFromString(path.read_bytes())
+    after = vmhwm_kb()
+    first_len = len(msg.paths[0]) if msg.paths else 0
+    return {
+        "path": str(path),
+        "elapsed": time.time() - start,
+        "vmhwm_before_kb": before,
+        "vmhwm_after_kb": after,
+        "paths_len": len(msg.paths),
+        "first_path_len": first_len,
+    }
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--control", type=Path, default=ARTIFACTS / "control_one_path.pb")
+    parser.add_argument("--malicious", type=Path, default=ARTIFACTS / "malicious_paths_5000000.pb")
+    parser.add_argument("--json-out", type=Path)
+    args = parser.parse_args()
+
+    control = parse_one(args.control)
+    malicious = parse_one(args.malicious)
+    summary = {
+        "format": "Protocol Buffers",
+        "protobuf_version": __import__("google.protobuf").protobuf.__version__,
+        "entrypoint": "field_mask_pb2.FieldMask().ParseFromString(...)",
+        "control": control,
+        "malicious": malicious,
+        "delta": {
+            "elapsed_ratio": malicious["elapsed"] / max(control["elapsed"], 1e-9),
+            "vmhwm_delta_kb": malicious["vmhwm_after_kb"] - control["vmhwm_after_kb"],
+            "paths_added": malicious["paths_len"] - control["paths_len"],
+            "repro_ok": (
+                control["paths_len"] == 1
+                and malicious["paths_len"] == 5_000_000
+                and malicious["vmhwm_after_kb"] - control["vmhwm_after_kb"] >= 150_000
+            ),
+        },
+    }
+    if args.json_out:
+        args.json_out.write_text(json.dumps(summary, indent=2) + "\n")
+    print(json.dumps(summary, indent=2))
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())