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authorLinus Torvalds <torvalds@linux-foundation.org>2017-11-27 01:11:54 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2017-11-27 01:11:54 +0300
commit02fc87b117a9b9ec325089d098fce86ed11966bd (patch)
tree537176c1c32b25c781bf8974af854a4ee4dbc77a /arch/x86/Kconfig
parent6830c8db58c2616d8ba2bf45e7d98dca5f69b07f (diff)
parent12a78d43de767eaf8fb272facb7a7b6f2dc6a9df (diff)
downloadlinux-02fc87b117a9b9ec325089d098fce86ed11966bd.tar.xz
Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull misc x86 fixes from Ingo Molnar: - topology enumeration fixes - KASAN fix - two entry fixes (not yet the big series related to KASLR) - remove obsolete code - instruction decoder fix - better /dev/mem sanity checks, hopefully working better this time - pkeys fixes - two ACPI fixes - 5-level paging related fixes - UMIP fixes that should make application visible faults more debuggable - boot fix for weird virtualization environment * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (24 commits) x86/decoder: Add new TEST instruction pattern x86/PCI: Remove unused HyperTransport interrupt support x86/umip: Fix insn_get_code_seg_params()'s return value x86/boot/KASLR: Remove unused variable x86/entry/64: Add missing irqflags tracing to native_load_gs_index() x86/mm/kasan: Don't use vmemmap_populate() to initialize shadow x86/entry/64: Fix entry_SYSCALL_64_after_hwframe() IRQ tracing x86/pkeys/selftests: Fix protection keys write() warning x86/pkeys/selftests: Rename 'si_pkey' to 'siginfo_pkey' x86/mpx/selftests: Fix up weird arrays x86/pkeys: Update documentation about availability x86/umip: Print a warning into the syslog if UMIP-protected instructions are used x86/smpboot: Fix __max_logical_packages estimate x86/topology: Avoid wasting 128k for package id array perf/x86/intel/uncore: Cache logical pkg id in uncore driver x86/acpi: Reduce code duplication in mp_override_legacy_irq() x86/acpi: Handle SCI interrupts above legacy space gracefully x86/boot: Fix boot failure when SMP MP-table is based at 0 x86/mm: Limit mmap() of /dev/mem to valid physical addresses x86/selftests: Add test for mapping placement for 5-level paging ...
Diffstat (limited to 'arch/x86/Kconfig')
-rw-r--r--arch/x86/Kconfig12
1 files changed, 9 insertions, 3 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index df3276d6bfe3..8eed3f94bfc7 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1804,14 +1804,20 @@ config X86_SMAP
If unsure, say Y.
config X86_INTEL_UMIP
- def_bool n
+ def_bool y
depends on CPU_SUP_INTEL
prompt "Intel User Mode Instruction Prevention" if EXPERT
---help---
The User Mode Instruction Prevention (UMIP) is a security
feature in newer Intel processors. If enabled, a general
- protection fault is issued if the instructions SGDT, SLDT,
- SIDT, SMSW and STR are executed in user mode.
+ protection fault is issued if the SGDT, SLDT, SIDT, SMSW
+ or STR instructions are executed in user mode. These instructions
+ unnecessarily expose information about the hardware state.
+
+ The vast majority of applications do not use these instructions.
+ For the very few that do, software emulation is provided in
+ specific cases in protected and virtual-8086 modes. Emulated
+ results are dummy.
config X86_INTEL_MPX
prompt "Intel MPX (Memory Protection Extensions)"