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CONFIG_ARM64_PAN: Enable support for Privileged Access Never (PAN)

General informations

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.

Hardware

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