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CONFIG_UNMAP_KERNEL_AT_EL0: Unmap kernel when running in userspace (aka 'KAISER')

General informations

The Linux kernel configuration item CONFIG_UNMAP_KERNEL_AT_EL0:

Help text

Speculation attacks against some high-performance processors can be used to bypass MMU permission checks and leak kernel data to userspace. This can be defended against by unmapping the kernel when running in userspace, mapping it back in on exception entry via a trampoline page in the vector table.

If unsure, say Y.

Hardware

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