⬢ DragonFlyBSD Kernel Audit
DF-4261 / verdict.json
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{
  "finding_id": "DF-4261",
  "status": "untested",
  "reproduced": 0,
  "impact": "none",
  "confidence": "certain",
  "verdict": "Code-proven boot-time resource leak: every acpi_pst_attach() error path after acpi_pst_alloc_resource() (acpi_cpu_pstate.c:500) returns without releasing the allocated _PCT control/status bus resources (and leaves cpu_next_rid consumed) -- reachable only with attacker-controlled ACPI tables, hence Info. Not runtime-verified (Info policy; the guest firmware exposes no _PSS/_PCT, confirmed live).",
  "exploit_chain": "",
  "evidence": "VERDICT.md path:line table for all 9 leaking returns; fix.diff",
  "kernel_refs": [
    "sys/dev/acpica/acpi_cpu_pstate.c:500",
    "sys/dev/acpica/acpi_cpu_pstate.c:512",
    "sys/dev/acpica/acpi_cpu_pstate.c:547",
    "sys/dev/acpica/acpi_cpu_pstate.c:554",
    "sys/dev/acpica/acpi_cpu_pstate.c:574",
    "sys/dev/acpica/acpi_cpu_pstate.c:594",
    "sys/dev/acpica/acpi_cpu_pstate.c:601",
    "sys/dev/acpica/acpi_cpu_pstate.c:609",
    "sys/dev/acpica/acpi_cpu_pstate.c:690",
    "sys/dev/acpica/acpi_cpu_pstate.c:736",
    "sys/dev/acpica/acpi_cpu_pstate.c:1508",
    "sys/dev/acpica/acpi_package.c:120"
  ],
  "poc_changes": "No PoC (Info hardening finding; untested by policy)",
  "attempts": 0,
  "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": 0,
  "guest_dirty": 0,
  "build_cmd": "",
  "run_cmd": "",
  "code_hash": "",
  "fix_status": "not_testable",
  "fix_baseline_reproduced": 0,
  "fix_patched_reproduced": 0,
  "fix_verdict": "fix.diff routes all post-_PCT failures through a failed: label that releases pr_res (type derived from pr_gas.SpaceId, mirroring acpi_bus_alloc_gas). Authored from line-accurate confirmation; not compile-validated and not runtime-validated (Info finding, no test surface on the guest).",
  "fix_evidence": "fix.diff; VERDICT.md path table",
  "notes": "Guest dev.cpu.0 verified live to have no P-state nodes (no _PSS/_PCT in QEMU 7.2 SSDT), so no in-guest trigger exists without custom -acpitable AML.",
  "recommended_fix": "Release pst_creg/pst_sreg pr_res on all acpi_pst_attach() error paths after allocation (goto-fail cleanup)"
}