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Date: Fri, 1 Dec 2017 12:10:00 -0800
From: Kees Cook <>
To: Andrew Morton <>
	Mark Rutland <>,
	Will Deacon <>,
	Laura Abbott <>,
Subject: [PATCH] Kconfig: Make STRICT_DEVMEM default-y on x86 and arm64

Distros have been shipping with CONFIG_STRICT_DEVMEM=y for years now. It
is probably time to flip this default for x86 and arm64.

Signed-off-by: Kees Cook <>
 lib/Kconfig.debug | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 947d3e2ed5c2..39b123d04a36 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1985,7 +1985,7 @@ config STRICT_DEVMEM
 	bool "Filter access to /dev/mem"
 	depends on MMU && DEVMEM
-	default y if TILE || PPC
+	default y if TILE || PPC || X86 || ARM64
 	  If this option is disabled, you allow userspace (root) access to all
 	  of memory, including kernel and userspace memory. Accidental

Kees Cook
Pixel Security

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