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Subject[tip:core/debug] Kconfig: Make STRICT_DEVMEM default-y on x86 and arm64
Commit-ID:  0f7cda2b824bb2afe0d75716a8664117fa03f5e0
Gitweb: https://git.kernel.org/tip/0f7cda2b824bb2afe0d75716a8664117fa03f5e0
Author: Kees Cook <keescook@chromium.org>
AuthorDate: Fri, 1 Dec 2017 12:10:00 -0800
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Mon, 11 Dec 2017 18:41:26 +0100

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@chromium.org>
Acked-by: Laura Abbott <labbott@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will.deacon@arm.com>
Cc: kernel-hardening@lists.openwall.com
Link: http://lkml.kernel.org/r/20171201201000.GA44539@beast
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
lib/Kconfig.debug | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 947d3e2..39b123d 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
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