ARM: mm: allow text and rodata sections to be read-only
This introduces CONFIG_DEBUG_RODATA, making kernel text and rodata read-only. Additionally, this splits rodata from text so that rodata can also be NX, which may lead to wasted memory when aligning to SECTION_SIZE. The read-only areas are made writable during ftrace updates and kexec. Signed-off-by: NKees Cook <keescook@chromium.org> Tested-by: NLaura Abbott <lauraa@codeaurora.org> Acked-by: NNicolas Pitre <nico@linaro.org>
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