⬢ DragonFlyBSD Kernel Audit
DF-3722 / 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
{
  "finding_id": "DF-3722",
  "status": "inconclusive",
  "reproduced": 0,
  "impact": "none",
  "confidence": "certain",
  "verdict": "Source-certain, hardware-gated, Info-grade: if_mxge.c sends uninitialized kernel stack to the device in three places - mxge_close passes an uninitialized mxge_cmd_t to MXGEFW_CMD_ETHERNET_DOWN (:3517/:3526, 12 bytes via mxge_send_cmd :797-800), mxge_dummy_rdma PIO-copies 64 bytes of a stack buffer of which only 24 are initialized (:738/:758-765/:769), and mxge_load_firmwares boot handoff copies 64 bytes of which only 28 are initialized (:904/:954-967/:970). Device-directed disclosure only (stale stack contents observable by a hostile NIC); not userspace-visible. Guest has no Myricom device; verification skipped per Low/Info convention.",
  "exploit_chain": "",
  "evidence": "findings/poc/DF-3722/VERDICT.md; fix.diff (three bzero() calls, git-apply clean); env.txt",
  "kernel_refs": [
    "sys/dev/netif/mxge/if_mxge.c:3517",
    "sys/dev/netif/mxge/if_mxge.c:3526",
    "sys/dev/netif/mxge/if_mxge.c:738",
    "sys/dev/netif/mxge/if_mxge.c:769",
    "sys/dev/netif/mxge/if_mxge.c:904",
    "sys/dev/netif/mxge/if_mxge.c:970"
  ],
  "poc_changes": "No seed PoC; hardening finding, no guest run.",
  "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": 10,
  "guest_dirty": 0,
  "build_cmd": "n/a",
  "run_cmd": "n/a",
  "code_hash": "",
  "notes": "mxge_send_cmds own buffer (:788-809) is fully initialized - only the three listed loci are affected.",
  "recommended_fix": "bzero the stack buffers before filling (mxge_close cmd; both 72-byte pio buffers).",
  "fix_status": "not_testable",
  "fix_baseline_reproduced": 0,
  "fix_patched_reproduced": 0,
  "fix_verdict": "fix.diff git apply --check clean; trivial hygiene change, not buildable without mxge hardware.",
  "fix_evidence": "findings/poc/DF-3722/fix.diff"
}