Date: Fri, 1 Dec 2017 12:10:00 -0800 From: Kees Cook Message-ID: <20171201201000.GA44539@beast> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Subject: [kernel-hardening] [PATCH] Kconfig: Make STRICT_DEVMEM default-y on x86 and arm64 To: Andrew Morton Cc: linux-kernel@vger.kernel.org, kernel-hardening@lists.openwall.com, Mark Rutland , Will Deacon , Laura Abbott , x86@kernel.org List-ID: 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 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