{
  "finding_id": "DF-4386",
  "status": "untested",
  "reproduced": 0,
  "impact": "none",
  "confidence": "certain",
  "verdict": "oce_get_fw_version (oce_mbox.c:289) bcopys exactly 32 device bytes into sc->fw_version[32] with no NUL guarantee; oce_sysctl.c:84-89 publishes it as a read-only string sysctl whose handler (kern_sysctl.c:1171) serves strlen(arg1)+1 bytes UNBOUNDED by arg2. A device returning 32 non-NUL bytes makes strlen walk into adjacent struct oce_softc fields (macaddr, OCE_DMA_MEM kernel pointers) and copy them to any unprivileged sysctl reader. Hardware-gated on guest (no oce NIC); sink behavior proven by guarded replica (+55 bytes past buffer). Low: malicious-peripheral class, defense-in-depth; also flags the unbounded-strlen string-sysctl pattern.",
  "exploit_chain": "",
  "evidence": "t6_guarded_run.log (strlen walked 87 bytes, +55 OOB), VERDICT.md trace, fix.diff (git apply --check OK, syntax-validated)",
  "kernel_refs": [
    "sys/dev/netif/oce/oce_sysctl.c:84",
    "sys/dev/netif/oce/oce_mbox.c:289",
    "sys/kern/kern_sysctl.c:1171"
  ],
  "poc_changes": "n/a - pass-2 finding authored fresh; first replica hit gcc constant-folding, rewritten with volatile+guard-page model",
  "attempts": 2,
  "guest_uname": "DragonFly dfbsd 6.5-DEVELOPMENT #0: Thu Jul 2 06:02:54 UTC 2026 root@dfbsd:/usr/obj/usr/src/sys/X86_64_GENERIC x86_64",
  "runtime_sec": 30,
  "guest_dirty": 0,
  "build_cmd": "./build.sh (guest cc 8.3)",
  "run_cmd": "./run.sh",
  "code_hash": "58952834018b46cadc591377b9bbd9b08f8d0662180d3168a45ee22357ca9e6e",
  "notes": "Status untested = target device absent on guest.",
  "recommended_fix": "terminate: sc->fw_version[sizeof(sc->fw_version)-1] = 0 after the bcopy (fix.diff)",
  "fix_status": "not_testable",
  "fix_baseline_reproduced": 0,
  "fix_patched_reproduced": 0,
  "fix_verdict": "not_testable at runtime (no oce NIC); fix.diff git-apply OK, patched oce_mbox.c syntax-validated with guest kernel toolchain (0 errors).",
  "fix_evidence": "fix.diff; guest cc -fsyntax-only of patched oce_mbox.c: 0 errors.",
  "fix_kernel_uname": "DragonFly dfbsd 6.5-DEVELOPMENT #0: Thu Jul 2 06:02:54 UTC 2026 x86_64"
}