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63bcff2a30
linux/arch/x86
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H. Peter Anvin 63bcff2a30 x86, smap: Add STAC and CLAC instructions to control user space access 
When Supervisor Mode Access Prevention (SMAP) is enabled, access to
userspace from the kernel is controlled by the AC flag.  To make the
performance of manipulating that flag acceptable, there are two new
instructions, STAC and CLAC, to set and clear it.

This patch adds those instructions, via alternative(), when the SMAP
feature is enabled.  It also adds X86_EFLAGS_AC unconditionally to the
SYSCALL entry mask; there is simply no reason to make that one
conditional.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Link: http://lkml.kernel.org/r/1348256595-29119-9-git-send-email-hpa@linux.intel.com
2012-09-21 12:45:27 -07:00
..
boot x86, build: Globally set -fno-pic 2012-08-10 16:12:30 -07:00
configs x86/kconfig: Remove CONFIG_TR=y from the defconfigs 2012-03-24 08:18:03 +01:00
crypto crypto: twofish-avx - remove useless instruction 2012-07-11 11:08:30 +08:00
ia32 x86, smap: Add STAC and CLAC instructions to control user space access 2012-09-21 12:45:27 -07:00
include/asm x86, smap: Add STAC and CLAC instructions to control user space access 2012-09-21 12:45:27 -07:00
kernel x86, smap: Add STAC and CLAC instructions to control user space access 2012-09-21 12:45:27 -07:00
kvm KVM: x86: fix KVM_GET_MSR for PV EOI 2012-08-27 18:03:05 -03:00
lguest lguest: Make sure interrupt is allocated ok by lguest_setup_irq 2012-01-12 15:44:47 +10:30
lib x86, smap: Add STAC and CLAC instructions to control user space access 2012-09-21 12:45:27 -07:00
math-emu x86: Rename trap_no to trap_nr in thread_struct 2012-03-13 06:24:09 +01:00
mm x86-32, mm: The WP test should be done on a kernel page 2012-09-21 12:45:25 -07:00
net x86 bpf_jit: support BPF_S_ANC_ALU_XOR_X instruction 2012-06-06 09:42:44 -07:00
oprofile perf/x86/amd: Unify AMD's generic and family 15h pmus 2012-07-05 21:19:41 +02:00
pci Merge branch 'pci/myron-pcibios_setup' into next 2012-07-05 15:31:05 -06:00
platform Revert "x86-64/efi: Use EFI to deal with platform wall clock" 2012-08-14 09:58:25 -07:00
power x86, kvm: Call restore_sched_clock_state() only after %gs is initialized 2012-04-02 13:53:00 +02:00
realmode x86, build: Globally set -fno-pic 2012-08-10 16:12:30 -07:00
syscalls x32: Use compat shims for {g,s}etsockopt 2012-08-18 14:15:39 -07:00
tools x86/decoder: Fix bsr/bsf/jmpe decoding with operand-size prefix 2012-06-06 08:54:18 +02:00
um um: switch UPT_SET_RETURN_VALUE and regs_return_value to pt_regs 2012-08-01 23:33:16 +02:00
vdso x86, cpu: Rename checking_wrmsrl() to wrmsrl_safe() 2012-06-07 13:32:04 -07:00
video x86: Use vga_default_device() when determining whether an fb is primary 2012-04-24 09:50:17 +01:00
xen Three bug-fixes: 2012-08-25 17:31:59 -07:00
.gitignore x86/kprobes: Add arch/x86/tools/insn_sanity to .gitignore 2012-01-16 08:21:59 +01:00
Kbuild x86, realmode: realmode.bin infrastructure 2012-05-08 11:41:48 -07:00
Kconfig x86, smap: Add a header file with macros for STAC/CLAC 2012-09-21 12:45:26 -07:00
Kconfig.cpu x86: Tighten dependencies of CPU_SUP_*_32 2012-03-08 10:57:34 +01:00
Kconfig.debug x86/tlb: add tlb_flushall_shift knob into debugfs 2012-06-27 19:29:10 -07:00
Makefile x86, build: Globally set -fno-pic 2012-08-10 16:12:30 -07:00
Makefile_32.cpu
Makefile.um um: fix linker script generation 2012-04-09 13:59:00 -04:00