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authorMark Rutland <mark.rutland@arm.com>2016-08-25 18:23:23 +0200
committerWill Deacon <will.deacon@arm.com>2016-08-26 11:13:41 +0200
commit40982fd6b975de4a51ce5147bc1d698c3b075634 (patch)
tree3021aa1627232dfcd14a00dea3f031008064eb50 /arch/arm64/Kconfig
parentarm64: mark reserved memblock regions explicitly in iomem (diff)
downloadlinux-40982fd6b975de4a51ce5147bc1d698c3b075634.tar.xz
linux-40982fd6b975de4a51ce5147bc1d698c3b075634.zip
arm64: always enable DEBUG_RODATA and remove the Kconfig option
Follow the example set by x86 in commit 9ccaf77cf05915f5 ("x86/mm: Always enable CONFIG_DEBUG_RODATA and remove the Kconfig option"), and make these protections a fundamental security feature rather than an opt-in. This also results in a minor code simplification. For those rare cases when users wish to disable this protection (e.g. for debugging), this can be done by passing 'rodata=off' on the command line. As DEBUG_RODATA_ALIGN is only intended to address a performance/memory tradeoff, and does not affect correctness, this is left user-selectable. DEBUG_MODULE_RONX is also left user-selectable until the core code provides a boot-time option to disable the protection for debugging use-cases. Cc: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Acked-by: Kees Cook <keescook@chromium.org> Acked-by: Laura Abbott <labbott@redhat.com> Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/Kconfig')
-rw-r--r--arch/arm64/Kconfig3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 9be0c164df4e..1e49fbc4b075 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -122,6 +122,9 @@ config ARCH_PHYS_ADDR_T_64BIT
config MMU
def_bool y
+config DEBUG_RODATA
+ def_bool y
+
config ARM64_PAGE_SHIFT
int
default 16 if ARM64_64K_PAGES