⬢ DragonFlyBSD Kernel Audit
DF-3632 / verdict.json
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{
  "finding_id": "DF-3632",
  "status": "inconclusive",
  "reproduced": 0,
  "poc_path": "findings/poc/DF-3632",
  "artifact_dir": "findings/poc/DF-3632",
  "build_cmd": "n/a (no iwm hardware on guest)",
  "run_cmd": "n/a (no iwm hardware on guest)",
  "code_hash": "8ba23b144426b8b4358b04385caf76a90cab1aac516d7aa4540d24b4dee92347",
  "build_log": null,
  "run_log": null,
  "impact": "none",
  "confidence": "certain",
  "verdict": "NVM sections are kmallocd at the exact firmware-returned length (if_iwm.c:2367-2375) but iwm_parse_nvm_data() and helpers read fixed word offsets without ever consulting nvm_sections[].length: e.g. regulatory[0x507] LAR read needs >=2576 bytes (:2251-2255), 7000 channel flags read SW bytes [64,142) (:2266-2269), 8000 flags read REGULATORY bytes [0,102) (:2270-2273), SKU/radio/n_hw_addr/MAC reads at fixed indices (:2072,:2125-2158,:2194). A short section yields heap OOB reads past small exact-size allocations; parsed data feeds the channel map and a console-printed MAC (:6386-6389). Same trust boundary as DF-1898 (Low). No iwm device on guest -> not exercisable (env.txt); source-level certainty.",
  "exploit_chain": "",
  "evidence": "VERDICT.md; README.md (per-offset byte requirements); env.txt; fix.diff (minimum section-length validation, applies clean)",
  "kernel_refs": [
    "sys/dev/netif/iwm/if_iwm.c:2251",
    "sys/dev/netif/iwm/if_iwm.c:2266",
    "sys/dev/netif/iwm/if_iwm.c:2270",
    "sys/dev/netif/iwm/if_iwm.c:2125",
    "sys/dev/netif/iwm/if_iwm.c:2194",
    "sys/dev/netif/iwm/if_iwm.c:2367",
    "sys/dev/netif/iwm/if_iwm.c:2290"
  ],
  "poc_changes": "n/a - source-level verification",
  "attempts": 1,
  "guest_uname": "DragonFly dfbsd 6.5-DEVELOPMENT DragonFly 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": 60,
  "guest_dirty": 0,
  "notes": "iwm module loads on guest (kldload if_iwm) but attaches to no device: pciconf shows no Intel Wireless NIC, no wlan interface appears. Verification is source-level (plus the DF-3631 logic-level harness).",
  "recommended_fix": "fix.diff validates family-aware minimum section lengths in iwm_parse_nvm_sections()",
  "fix_status": "not_testable",
  "fix_baseline_reproduced": false,
  "fix_patched_reproduced": false,
  "fix_verdict": "fix.diff validates family-aware minimum section lengths in iwm_parse_nvm_sections(); applies cleanly; no device to validate in-kernel",
  "fix_evidence": "fix.diff verified with patch --dry-run against sys/dev/netif/iwm/if_iwm.c; no kernel-level validation possible (no iwm device)"
}