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CONFIG_ARM_PAN: Enable privileged no-access

General informations

The Linux kernel configuration item CONFIG_ARM_PAN:

Help text

Increase kernel security by ensuring that normal kernel accesses are unable to access userspace addresses. This can help prevent use-after-free bugs becoming an exploitable privilege escalation by ensuring that magic values (such as LIST_POISON) will always fault when dereferenced.

The implementation uses CPU domains when !ARM_LPAE and disabling of TTBR0 page table walks with ARM_LPAE.

Hardware

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