The answer is essentially hardware-level dependency injection. Before calling LD_DESCRIPTOR, the caller saves its desired test constant into a hardware latch using a micro-op called PTSAV (Protection Save). Within LD_DESCRIPTOR, another micro-op called PTOVRR (Protection Override) retrieves and fires the saved test.
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Marieke Pepers says she gets her best ideas while out walking her dog
More recently, the xz utility was compromised by a malicious developer, almost leading to malware infecting Linux.