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Subject[PATCH v2] powerpc: Default to enabling STRICT_KERNEL_RWX
When available, CONFIG_KERNEL_RWX should be default-enabled for PPC64.
On PPC32, there is a performance trade-off.

Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Christophe LEROY <christophe.leroy@c-s.fr>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Kees Cook <keescook@chromium.org>
---
v2:
- depend on PPC64, as noted by Christophe.
---
arch/powerpc/Kconfig | 1 +
1 file changed, 1 insertion(+)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 809c468edab1..4315c9b2db4f 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -178,6 +178,7 @@ config PPC
select HAVE_ARCH_TRACEHOOK
select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !RELOCATABLE && !HIBERNATION)
select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
+ select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT if PPC64
select HAVE_CBPF_JIT if !PPC64
select HAVE_CONTEXT_TRACKING if PPC64
select HAVE_DEBUG_KMEMLEAK
--
2.7.4

--
Kees Cook
Pixel Security

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