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| author | H. Peter Anvin | 2012-09-21 21:43:10 +0200 |
|---|---|---|
| committer | H. Peter Anvin | 2012-09-21 21:45:26 +0200 |
| commit | 51ae4a2d775e1ee456282d7c60e49693d0a8555d (patch) | |
| tree | c79d01f5aea44c5f969a8aa4618cb92c69be3977 /arch/x86/Kconfig | |
| parent | x86, alternative: Add header guards to <asm/alternative-asm.h> (diff) | |
| download | kernel-qcow2-linux-51ae4a2d775e1ee456282d7c60e49693d0a8555d.tar.gz kernel-qcow2-linux-51ae4a2d775e1ee456282d7c60e49693d0a8555d.tar.xz kernel-qcow2-linux-51ae4a2d775e1ee456282d7c60e49693d0a8555d.zip | |
x86, smap: Add a header file with macros for STAC/CLAC
The STAC/CLAC instructions are only available with SMAP, but on the
other hand they aren't needed if SMAP is not available, or before we
start to run userspace, so construct them as alternatives which start
out as noops and are enabled by the alternatives mechanism.
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Link: http://lkml.kernel.org/r/1348256595-29119-7-git-send-email-hpa@linux.intel.com
Diffstat (limited to 'arch/x86/Kconfig')
| -rw-r--r-- | arch/x86/Kconfig | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 8ec3a1aa4abd..5ce86941333f 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1487,6 +1487,17 @@ config ARCH_RANDOM If supported, this is a high bandwidth, cryptographically secure hardware random number generator. +config X86_SMAP + def_bool y + prompt "Supervisor Mode Access Prevention" if EXPERT + ---help--- + Supervisor Mode Access Prevention (SMAP) is a security + feature in newer Intel processors. There is a small + performance cost if this enabled and turned on; there is + also a small increase in the kernel size if this is enabled. + + If unsure, say Y. + config EFI bool "EFI runtime service support" depends on ACPI |