Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752232AbdLAUKG (ORCPT ); Fri, 1 Dec 2017 15:10:06 -0500 Received: from mail-pg0-f65.google.com ([74.125.83.65]:37557 "EHLO mail-pg0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751319AbdLAUKE (ORCPT ); Fri, 1 Dec 2017 15:10:04 -0500 X-Google-Smtp-Source: AGs4zMa+m71g0zZivtQ67fUMFUP0pS3+dtkAv0fGaoJRE3W66wcp5hwS1fuMjMwx6NNMCug5KU1A9w== Date: Fri, 1 Dec 2017 12:10:00 -0800 From: Kees Cook To: Andrew Morton Cc: linux-kernel@vger.kernel.org, kernel-hardening@lists.openwall.com, Mark Rutland , Will Deacon , Laura Abbott , x86@kernel.org Subject: [PATCH] Kconfig: Make STRICT_DEVMEM default-y on x86 and arm64 Message-ID: <20171201201000.GA44539@beast> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 804 Lines: 28 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