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CONFIG_RODATA_FULL_DEFAULT_ENABLED: Apply r/o permissions of VM areas also to their linear aliases

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The Linux kernel configuration item CONFIG_RODATA_FULL_DEFAULT_ENABLED:

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Apply read-only attributes of VM areas to the linear alias of the backing pages as well. This prevents code or read-only data from being modified (inadvertently or intentionally) via another mapping of the same memory page. This additional enhancement can be turned off at runtime by passing rodata=[off|on] (and turned on with rodata=full if this option is set to 'n')

This requires the linear region to be mapped down to pages, which may adversely affect performance in some cases.



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