Batch A of the audit's medium tier (M1+M2+M3):
- M1 driver-death detection: a dead WUDFHost stops publishing, which at the
ring is indistinguishable from an idle desktop — SDR sessions streamed a
frozen frame forever (next_frame's 20 s bail is unreachable once anything
presented). The ChannelBroker's process handle now doubles as a liveness
probe (SYNCHRONIZE at OpenProcess); while no fresh frame arrives,
try_consume polls it (rate-limited) and fails the capturer, landing in the
session's bounded in-place rebuild.
- M2 reopenable control device: the manager's OnceLock-cached handle is now
a retire/reopen DeviceSlot — a gone-classified IOCTL failure (driver
upgrade / WUDFHost restart; pinger, create, or REMOVE) retires the handle
and the next use reopens + re-handshakes. Retired handles are deliberately
kept alive forever: bare-HANDLE holders (pinger, ChannelBroker) rely on
never-closed, and a retired handle only fails IOCTLs. CLEAR_ALL runs on
the FIRST open only (a reopen races live-ish sessions); acquire retries
the monitor create once after a reopen. The JOIN path now probes the
active monitor's WUDFHost pid and preempts a DEAD monitor instead of
handing the rebuilding session its stale target — without this the whole
recovery chain starved to the rebuild budget.
- M3 interface discovery: enumerate ALL interface instances with an
SPINT_ACTIVE filter (a Code-10 devnode at index 0 no longer shadows the
live interface), HDEVINFO behind RAII (error paths leaked one per probe),
the raw device handle wrapped before GET_INFO (leaked on handshake
failure), and the detail-sizing result guarded before the cbSize write.
- pf-driver-proto: SetFrameChannelRequest doc now states the real
adopt-on-success contract (the old wording invited a driver-side
close-on-error — a cross-process double-close against the host's reap).
- install: pf_vdisplay_present() passes /connected so a phantom devnode
can't suppress creating a live ROOT node.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
enricobuehler
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