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A deep-dive blog post on Apple's arm64e pointer authentication (PAC) ABI, explaining how PAC keys are stored outside memory, how instructions like PACIASP/AUTIASP sign and verify pointer bits, and how the A12's PAC field layout is measured directly on stock hardware.
usbliter8 is a tethered bootrom exploit for Apple A12 and A13 SoCs, using an RP2350-based microcontroller board to exploit a USB controller bug and gain low-level device access.