RIP my first kernel bug task_reference had no overflow checks and RootDomainUserClient violated IOKit object lifetime (increased ref in initWithTask, decreased in stop; so if start etc would fail you would get a ref leak) (Iirc this is the hash not at home atm to confirm)https://twitter.com/littlelailo/status/977548279989891072 …
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There are however about 100 different initWithTask methods and they added a lot of stuff between 2018 and now, so maybe there is acc a good code path. Also: the bug is still present in source but I checked 13b1 and they added checks there.
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LOL funny thing is I was looking at RootDomainUserClient on the open source website when I was looking for the file used in async_wake..
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