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PACI*SP have the advantage that they are in HINT space, meaning they can be run successfully in hardware without PAuth support - they will just behave as a NOP. However, PACI*SP are also implicit landing pads (think of an extra BTI jc). Therefore, they allow indirect jumps of all kinds into them, potentially inserting new gadgets. This patch replaces PACI*SP by PACI* LR, SP when compiling explicitly for hardware with full PAuth support. PACI* is not in the HINT space, therefore it will fault when run in hardware without PAuth support, but it is also not a landing pad, making programs safer in newer HW. Differential Revision: https://reviews.llvm.org/D101920 |
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