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The Linux kernel configuration item CONFIG_ARM64_PAN
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Privileged Access Never (PAN; part of the ARMv8.1 Extensions) prevents the kernel or hypervisor from accessing user-space (EL0) memory directly.
Choosing this option will cause any unprotected (not using copy_to_user et al) memory access to fail with a permission fault.
The feature is detected at runtime, and will remain as a 'nop' instruction if the cpu does not implement the feature.
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