linux-kernel - [PATCH] Kconfig: Make STRICT_DEVMEM default-y on x86 and arm64

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Date:   Fri, 1 Dec 2017 12:10:00 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org, kernel-hardening@...ts.openwall.com,
        Mark Rutland <mark.rutland@....com>,
        Will Deacon <will.deacon@....com>,
        Laura Abbott <labbott@...hat.com>, x86@...nel.org
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 <keescook@...omium.org>
---
 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
 	depends on ARCH_HAS_DEVMEM_IS_ALLOWED
-	default y if TILE || PPC
+	default y if TILE || PPC || X86 || ARM64
 	---help---
 	  If this option is disabled, you allow userspace (root) access to all
 	  of memory, including kernel and userspace memory. Accidental
-- 
2.7.4


-- 
Kees Cook
Pixel Security