{
  "finding_id": "DF-3734",
  "status": "inconclusive",
  "reproduced": 0,
  "impact": "none",
  "confidence": "likely",
  "verdict": "Source-certain one-past-end OOB heap read: r600.c:486 increments requested_clock_mode_index in the discrete-branch DYNPM downclock path without checking num_clock_modes; with PowerPlayInfo frev1/2 BIOS tables every state has exactly one clock mode (radeon_atombios.c:2127-2133), so the increment yields index 1 == mode count and clock_info[1] is read past a 1-element kzalloc at r600.c:516-522 (DRM_DEBUG_DRIVER args are evaluated even with printing off) and via r600_pm_misc/radeon_set_power_state (r600.c:771, radeon_pm.c:181-199), programming garbage clocks/voltage. Runtime reproduction was impossible on the audit guest: virtio-only (no AMD PCI device) and radeonkms.ko is not built for the guest kernel (env.txt/run.log). On DragonFly the DYNPM method is additionally unreachable today because all PM sysfs attribute creation is compiled out (radeon_pm.c:1603/1638 #if 0), making the defect latent here but identical in reachability posture to accepted sibling DF-1196 (which is the power_state index at :405 in the IGP branch; DF-3734 is the clock_mode index at :486 in the discrete branch \u2014 different variable, array, and bounds source, not a duplicate).",
  "exploit_chain": "",
  "evidence": "VERDICT.md (full source-level trace with path:line); fix.diff (bounds-checked increment); run.log + env.txt (guest has no AMD GPU and no radeonkms.ko \u2014 224 radeonkmsfw_*.ko firmware stubs only); decisive lines: r600.c:486 (unchecked ++), radeon.h:1300-1311 (clock_info is per-state heap pointer), radeon_atombios.c:2126-2133 (1-element allocation, num_clock_modes=1), radeon_atombios.c:2075-2078 (NO_DISPLAY on state 0 by default), r600.c:516-522 + r600.c:771 + radeon_pm.c:181-199 (OOB consumers).",
  "kernel_refs": [
    "sys/dev/drm/radeon/r600.c:486",
    "sys/dev/drm/radeon/r600.c:469-487",
    "sys/dev/drm/radeon/r600.c:516-522",
    "sys/dev/drm/radeon/r600.c:766-783",
    "sys/dev/drm/radeon/radeon.h:1300-1311",
    "sys/dev/drm/radeon/radeon_atombios.c:2126-2133",
    "sys/dev/drm/radeon/radeon_atombios.c:2075-2078",
    "sys/dev/drm/radeon/radeon_pm.c:181-199",
    "sys/dev/drm/radeon/radeon_pm.c:444-449",
    "sys/dev/drm/radeon/radeon_pm.c:1603-1616"
  ],
  "poc_changes": "No runnable PoC exists for a kernel-internal PM index bug without r6xx hardware; replaced with a source-level proof plus guest module/hardware presence check.",
  "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": 12,
  "guest_dirty": 0,
  "build_cmd": "n/a \u2014 no buildable trigger without r6xx hardware; guest check: dfbsd-qemu/vm.sh run_root ls /boot/kernel/radeonkms.ko; pciconf -l | grep 1002",
  "run_cmd": "./run.sh",
  "code_hash": "",
  "notes": "Distinct from DF-1196 (power_state index, IGP branch, r600.c:405). DYNPM is dead code on DragonFly today (PM sysfs attrs #if 0 at radeon_pm.c:1603/1638) \u2014 latent defect, same reachability posture as accepted DF-1196. Impact ceiling: OOB heap read feeding GPU clock/voltage programming (local DoS/hardware misbehavior), no direct kernel-memory disclosure to userspace.",
  "recommended_fix": "Bounds-check requested_clock_mode_index++ at r600.c:486 against power_state[requested_power_state_index].num_clock_modes (see fix.diff).",
  "fix_status": "not_testable",
  "fix_baseline_reproduced": 0,
  "fix_patched_reproduced": 0,
  "fix_verdict": "fix.diff authored against the read-only sys/ tree; kernel fix build/validation not attempted \u2014 the guest has no radeon hardware and no radeonkms.ko, so neither baseline nor patched behavior is observable.",
  "fix_evidence": "findings/poc/DF-3734/fix.diff"
}