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CONFIG_ARM_KERNMEM_PERMS: Restrict kernel memory permissions

General informations

The Linux kernel configuration item CONFIG_ARM_KERNMEM_PERMS:

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If this is set, kernel memory other than kernel text (and rodata) will be made non-executable. The tradeoff is that each region is padded to section-size (1MiB) boundaries (because their permissions are different and splitting the 1M pages into 4K ones causes TLB performance problems), wasting memory.

Hardware

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