chrg6
465ffe67bb
Check a system event's kept handle under the kernel lock before signalling it, and keep host-memory events in a full table.
...
kern_signal_system_event read the table entry and the state byte without the kernel lock, then kern_event_signal took
the lock and ended the process when the kept writable handle was no longer an event. A host thread (the vsync thread
signals every bound vsync event 60 times a second) racing the guest's DestroySystemEvent, which zeroes the byte and
then closes both handles under the kernel lock, hit that fatal; a probe built on kernel.c reached it after 437
destroy and bind rounds. A stale entry whose byte reads nonzero again ended the process at once, and since h_new hands
a closed number to the next new object, a stale entry could also signal or clear an unrelated event.
Each Event now gets a serial number, and kern_bind_system_event records the serial of the Event its writable handle
names. The new system_event_set reads the entry again under the kernel lock and sets or clears the event only while
the handle still names that same Event; a stale entry is skipped and logged once. kern_clear_system_event goes through
it as well. The lock order is G before g_se_lock; the binder never holds both.
The full-table path of kern_bind_system_event took any entry whose object mem_readable did not know, which includes
the live events host services keep in their own memory (ov_movie2.c Video.in_ev/out_ev, net_offline.c
HostTask.event). The service's next signal from its host thread then found no entry and tried to bind there, which is
fatal. Entries now record whether the object lies in guest memory, and only guest entries that were destroyed or
unmapped give their slot.
tests/system_event_check.py builds kernel.c with stubs and checks a destroyed event with its byte nonzero again, a
closed number taken by an unrelated event, two seconds of a host thread signalling and clearing against a guest
thread destroying and binding again, a full table with the movie's two host-memory events, and the "table full"
fatal with every entry live. Against the previous kernel.c it ends with "kern_event_signal: 0x1001 is not a writable
event handle". sync_wake_check and thread_end_check pass.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com >
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