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| author | Dave Hansen <dave.hansen@linux.intel.com> | 2014-12-12 21:38:36 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2014-12-15 17:58:57 +0300 |
| commit | 72e9b5fe9bee0826e7ce7599adbdc64e544780ef (patch) | |
| tree | ce252b251b1ca1732b9eaba4f5361d9d793b7828 /arch/x86 | |
| parent | 010e593b140decdc16bb0c1c754b07b1fccb6999 (diff) | |
| download | linux-72e9b5fe9bee0826e7ce7599adbdc64e544780ef.tar.xz | |
x86, mpx: Give MPX a real config option prompt
Give MPX a real config option. The CPUs that support it (referenced
here):
https://software.intel.com/en-us/forums/topic/402393
are not available publicly yet. Right now only the software emulator
provides MPX for the general public.
[ tglx: Make it default off. There is no point in having it on right
now as no hardware and no proper tooling support are available ]
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Dave Hansen <dave@sr71.net>
Link: http://lkml.kernel.org/r/20141212183836.2569D58D@viggo.jf.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/Kconfig | 30 |
1 files changed, 26 insertions, 4 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 967dfe0ba85e..cc91e5e55d13 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -248,10 +248,6 @@ config HAVE_INTEL_TXT def_bool y depends on INTEL_IOMMU && ACPI -config X86_INTEL_MPX - def_bool y - depends on CPU_SUP_INTEL - config X86_32_SMP def_bool y depends on X86_32 && SMP @@ -1575,6 +1571,32 @@ config X86_SMAP If unsure, say Y. +config X86_INTEL_MPX + prompt "Intel MPX (Memory Protection Extensions)" + def_bool n + depends on CPU_SUP_INTEL + ---help--- + MPX provides hardware features that can be used in + conjunction with compiler-instrumented code to check + memory references. It is designed to detect buffer + overflow or underflow bugs. + + This option enables running applications which are + instrumented or otherwise use MPX. It does not use MPX + itself inside the kernel or to protect the kernel + against bad memory references. + + Enabling this option will make the kernel larger: + ~8k of kernel text and 36 bytes of data on a 64-bit + defconfig. It adds a long to the 'mm_struct' which + will increase the kernel memory overhead of each + process and adds some branches to paths used during + exec() and munmap(). + + For details, see Documentation/x86/intel_mpx.txt + + If unsure, say N. + config EFI bool "EFI runtime service support" depends on ACPI |