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ARM: mm: allow text and rodata sections to be read-only

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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: Kees Cook <keescook@chromium.org>
Tested-by: Laura Abbott <lauraa@codeaurora.org>
Acked-by: Nicolas Pitre <nico@linaro.org>
This commit is contained in:
Kees Cook 2014-04-03 13:29:50 -07:00
commit 80d6b0c2ee
6 changed files with 92 additions and 1 deletions
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