⬢ DragonFlyBSD Kernel Audit
DF-3630 / verdict.json
← back to finding ↓ download raw 
 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
{
  "finding_id": "DF-3630",
  "status": "inconclusive",
  "reproduced": 0,
  "poc_path": "findings/poc/DF-3630",
  "artifact_dir": "findings/poc/DF-3630",
  "build_cmd": "n/a (no iwm hardware on guest)",
  "run_cmd": "n/a (no iwm hardware on guest)",
  "code_hash": "80fa7d4297f3b8bead12140282e00f0a5c2e0b5e6f3dd8d3ef6a4678721bc868",
  "build_log": null,
  "run_log": null,
  "impact": "none",
  "confidence": "certain",
  "verdict": "iwm_handle_rxb() copies sizeof(sc->sc_cmd_resp)==PAGE_SIZE (4096) bytes from a command response packet (if_iwm.c:5511-5514) regardless of the packets actual length or its offset in the 4096-byte RX cluster; HAVEROOM() allows offset up to 4087 (:5377-5380,5405), so a response preceded by any other notification overreads up to ~4087 bytes past the mbuf cluster. The copy is the source of every synchronous command response (hcmd->resp_pkt, if_iwm_util.c:327). Sibling: iwm_alive_fn() v3 fallback (:2784-2789) reads a fixed struct from the raw packet with no payload-length check. Distinct from DF-1145 (MPDU byte_count/mpdu_len, phy-cmd, statistics sinks). Not exercisable on the guest (no iwm device; env.txt).",
  "exploit_chain": "",
  "evidence": "VERDICT.md; README.md (copy-span arithmetic); env.txt; fix.diff (length-clamped copy + alive_fn minimum-length check, applies clean)",
  "kernel_refs": [
    "sys/dev/netif/iwm/if_iwm.c:5509",
    "sys/dev/netif/iwm/if_iwm.c:5512",
    "sys/dev/netif/iwm/if_iwm.c:5572",
    "sys/dev/netif/iwm/if_iwm.c:2784",
    "sys/dev/netif/iwm/if_iwm.c:5377",
    "sys/dev/netif/iwm/if_iwm_util.c:327",
    "sys/dev/netif/iwm/if_iwmvar.h:312",
    "sys/dev/netif/iwm/if_iwmvar.h:500"
  ],
  "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 clamps the copy to the computed packet length (len, if_iwm.c:5403-5404) and adds an alive_fn payload check",
  "fix_status": "not_testable",
  "fix_baseline_reproduced": false,
  "fix_patched_reproduced": false,
  "fix_verdict": "fix.diff clamps the copy to the computed packet length (len, if_iwm.c:5403-5404) and adds an alive_fn payload check; 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)"
}