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by NobodyNada
1819 days ago
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> On Darwin, x18 is used [...] on hardware where Meltdown mitigations are needed. [...] On M1, it's currently usable by applications I’m confused. x18 is an ARM register, but I thought Meltdown only affected x86 chips. Were iOS devices vulnerable to Meltdown too? Or did you mean not x18 specifically but some equivalent OS-reserved x86 register? |
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However, due to specific features of the Arm architecture, it was patchable without a significant performance hit.
(see this section: https://siguza.github.io/KTRR/#meltdownspectre-mitigations-1..., which made the need for actually doing a page table switch avoidable)