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(parent: 1e6b481) | patch
ARM: mm: allow text and rodata sections to be read-only
authorKees Cook <keescook@chromium.org>
Thu, 3 Apr 2014 20:29:50 +0000 (13:29 -0700)
committerKees Cook <keescook@chromium.org>
Thu, 16 Oct 2014 21:38:54 +0000 (14:38 -0700)
commit80d6b0c2eed2a504f6740cd1f5ea76dc50abfc4d
tree32f6d8a1c5a2250cc3f303df545dfbf52da62d19tree | snapshot (tar.gz zip)
parent1e6b48116a95046ec51f3d40f83aff8b006674d7commit | diff
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: Kees Cook <keescook@chromium.org>
Tested-by: Laura Abbott <lauraa@codeaurora.org>
Acked-by: Nicolas Pitre <nico@linaro.org>
arch/arm/include/asm/cacheflush.h diff | blob | blame | history
arch/arm/kernel/ftrace.c diff | blob | blame | history
arch/arm/kernel/machine_kexec.c diff | blob | blame | history
arch/arm/kernel/vmlinux.lds.S diff | blob | blame | history
arch/arm/mm/Kconfig diff | blob | blame | history
arch/arm/mm/init.c diff | blob | blame | history