⬢ DragonFlyBSD Kernel Audit
DF-4214 / verdict.json
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{
  "finding_id": "DF-4214",
  "status": "untested",
  "reproduced": 0,
  "impact": "none",
  "confidence": "certain",
  "verdict": "mpt_reply_handlers[] is global and registration idempotent across controllers (mpt.c:417-426) but mpt_raid_detach deregisters unconditionally (mpt_raid.c:338-340). With >=2 mpt RAID controllers, detaching one clears the shared handler slot; the survivors RAID-action replies then hit mpt_default_reply_handler (mpt.c:480-495) which never completes or frees the request -> requests pinned on request_pending_list, 2s busy-poll timeouts, pool exhaustion and non-interruptible mpt_get_request sleeps wedging the RAID thread and sysctl writers.",
  "exploit_chain": "",
  "evidence": "findings/poc/DF-4214/VERDICT.md, findings/poc/DF-4214/env.txt (guest pciconf: no triggering hardware), findings/poc/DF-4214/fix.diff",
  "kernel_refs": [
    "sys/dev/disk/mpt/mpt_raid.c:135",
    "sys/dev/disk/mpt/mpt_raid.c:291",
    "sys/dev/disk/mpt/mpt_raid.c:338",
    "sys/dev/disk/mpt/mpt.c:119",
    "sys/dev/disk/mpt/mpt.c:423",
    "sys/dev/disk/mpt/mpt.c:466",
    "sys/dev/disk/mpt/mpt.c:480"
  ],
  "poc_changes": "no runnable PoC: hardware-gated path absent from the audit guest (env.txt)",
  "attempts": 0,
  "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": 0,
  "guest_dirty": 0,
  "build_cmd": null,
  "run_cmd": null,
  "code_hash": null,
  "notes": "Needs two MPT HBAs + detach of one + RAID resync activity on the other. Severity Low (unusual config), mechanism source-certain.",
  "recommended_fix": "refcount the shared registration (raid_handler_refs) and deregister only on last detach",
  "fix_status": "not_testable",
  "fix_baseline_reproduced": 0,
  "fix_patched_reproduced": 0,
  "fix_verdict": "diff authored and git-apply-verified against the read-only sys/ tree; runtime fix validation impossible without the triggering hardware on the QEMU guest",
  "fix_evidence": "findings/poc/DF-4214/fix.diff (git apply --check passed)"
}