From: Kees Cook <keescook@chromium.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org,
kernel-hardening@lists.openwall.com,
Mark Rutland <mark.rutland@arm.com>,
Will Deacon <will.deacon@arm.com>,
Laura Abbott <labbott@redhat.com>,
x86@kernel.org
Subject: [kernel-hardening] [PATCH] Kconfig: Make STRICT_DEVMEM default-y on x86 and arm64
Date: Fri, 1 Dec 2017 12:10:00 -0800 [thread overview]
Message-ID: <20171201201000.GA44539@beast> (raw)
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@chromium.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
WARNING: multiple messages have this Message-ID (diff)
From: Kees Cook <keescook@chromium.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org,
kernel-hardening@lists.openwall.com,
Mark Rutland <mark.rutland@arm.com>,
Will Deacon <will.deacon@arm.com>,
Laura Abbott <labbott@redhat.com>,
x86@kernel.org
Subject: [PATCH] Kconfig: Make STRICT_DEVMEM default-y on x86 and arm64
Date: Fri, 1 Dec 2017 12:10:00 -0800 [thread overview]
Message-ID: <20171201201000.GA44539@beast> (raw)
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@chromium.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
next reply other threads:[~2017-12-01 20:10 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-01 20:10 Kees Cook [this message]
2017-12-01 20:10 ` [PATCH] Kconfig: Make STRICT_DEVMEM default-y on x86 and arm64 Kees Cook
2017-12-01 20:46 ` [kernel-hardening] " Laura Abbott
2017-12-01 20:46 ` Laura Abbott
2017-12-04 15:56 ` [kernel-hardening] " Will Deacon
2017-12-04 15:56 ` Will Deacon
2017-12-04 18:19 ` [kernel-hardening] " Kees Cook
2017-12-04 18:19 ` Kees Cook
2017-12-12 10:56 ` [tip:core/debug] " tip-bot for Kees Cook
2017-12-19 13:33 ` [kernel-hardening] [PATCH] " Ard Biesheuvel
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