linux-kernel - [PATCH v2] powerpc: Default to enabling STRICT_KERNEL

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Date:   Thu, 5 Oct 2017 12:03:17 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Christophe LEROY <christophe.leroy@....fr>
Cc:     Balbir Singh <bsingharora@...il.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
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@...nel.crashing.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: Christophe LEROY <christophe.leroy@....fr>
Cc: Balbir Singh <bsingharora@...il.com>
Cc: linuxppc-dev@...ts.ozlabs.org
Signed-off-by: Kees Cook <keescook@...omium.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