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Andy Lutomirski 37868fe113 x86/ldt: Make modify_ldt synchronous 
modify_ldt() has questionable locking and does not synchronize
threads.  Improve it: redesign the locking and synchronize all
threads' LDTs using an IPI on all modifications.

This will dramatically slow down modify_ldt in multithreaded
programs, but there shouldn't be any multithreaded programs that
care about modify_ldt's performance in the first place.

This fixes some fallout from the CVE-2015-5157 fixes.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Reviewed-by: Borislav Petkov <bp@suse.de>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jan Beulich <jbeulich@suse.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sasha Levin <sasha.levin@oracle.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: security@kernel.org <security@kernel.org>
Cc: <stable@vger.kernel.org>
Cc: xen-devel <xen-devel@lists.xen.org>
Link: http://lkml.kernel.org/r/4c6978476782160600471bd865b318db34c7b628.1438291540.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-07-31 10:23:23 +02:00
..
crypto
x86/fpu: Rename i387.h to fpu/api.h
2015-05-19 15:47:30 +02:00
fpu
x86/fpu, sched: Dynamically allocate 'struct fpu'
2015-07-18 03:42:35 +02:00
numachip
…
trace
Merge branch 'x86-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2015-06-22 17:59:09 -07:00
uv
…
xen
xen: Add __GFP_DMA flag when xen_swiotlb_init gets free pages on ARM
2015-05-06 15:02:58 +01:00
a.out-core.h
…
acenv.h
…
acpi.h
…
agp.h
…
alternative-asm.h
x86/alternatives: Document macros
2015-05-06 11:25:31 +02:00
alternative.h
x86/alternatives, x86/fpu: Add 'alternatives_patched' debug flag and use it in xsave_state()
2015-05-19 15:48:03 +02:00
amd_nb.h
x86/gart: Check for GART support before accessing GART registers
2015-05-06 11:15:53 +02:00
apb_timer.h
…
apic_flat_64.h
…
apic.h
x86: Consolidate irq entering inlines
2015-05-15 16:04:49 +02:00
apicdef.h
…
apm.h
…
arch_hweight.h
…
archrandom.h
…
asm-offsets.h
…
asm.h
x86/asm/uaccess: Unify the ALIGN_DESTINATION macro
2015-05-14 07:25:34 +02:00
atomic64_32.h
…
atomic64_64.h
…
atomic.h
x86: Force inlining of atomic ops
2015-05-08 12:55:50 +02:00
barrier.h
locking/arch: Rename set_mb() to smp_store_mb()
2015-05-19 08:32:00 +02:00
bios_ebda.h
…
bitops.h
…
boot.h
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bootparam_utils.h
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bug.h
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bugs.h
…
cache.h
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cacheflush.h
Merge tag 'libnvdimm-for-4.2' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/nvdimm
2015-06-29 10:34:42 -07:00
calgary.h
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ce4100.h
…
checksum_32.h
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checksum_64.h
…
checksum.h
…
clocksource.h
…
cmdline.h
…
cmpxchg_32.h
…
cmpxchg_64.h
…
cmpxchg.h
arch: Remove __ARCH_HAVE_CMPXCHG
2015-05-13 10:55:42 +02:00
compat.h
…
context_tracking.h
…
cpu_device_id.h
…
cpu.h
…
cpufeature.h
x86_64, asm: Work around AMD SYSRET SS descriptor attribute issue
2015-04-26 17:57:38 -07:00
cpumask.h
…
crash.h
…
current.h
…
debugreg.h
…
delay.h
…
desc_defs.h
…
desc.h
x86/ldt: Make modify_ldt synchronous
2015-07-31 10:23:23 +02:00
device.h
…
disabled-features.h
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div64.h
…
dma-mapping.h
x86: Deinline dma_free_attrs()
2015-05-05 20:48:02 +02:00
dma.h
…
dmi.h
…
e820.h
…
edac.h
EDAC: Cleanup atomic_scrub mess
2015-05-28 15:31:53 +02:00
efi.h
x86/fpu: Rename i387.h to fpu/api.h
2015-05-19 15:47:30 +02:00
elf.h
…
emergency-restart.h
…
entry_arch.h
Merge branch 'x86/ras' into x86/core, to fix conflicts
2015-06-07 15:35:27 +02:00
espfix.h
x86/espfix: Add 'cpu' parameter to init_espfix_ap()
2015-07-06 15:00:33 +02:00
exec.h
…
fb.h
…
fixmap.h
…
floppy.h
…
frame.h
x86/debug: Remove perpetually broken, unmaintainable dwarf annotations
2015-06-02 07:57:48 +02:00
ftrace.h
…
futex.h
…
gart.h
…
genapic.h
…
geode.h
…
gpio.h
…
hardirq.h
Merge branch 'x86/ras' into x86/core, to fix conflicts
2015-06-07 15:35:27 +02:00
highmem.h
…
hpet.h
x86/MSI: Clean up unused MSI related code and interfaces
2015-04-24 15:36:49 +02:00
hugetlb.h
mm/hugetlb: remove arch_prepare/release_hugepage from arch headers
2015-06-25 17:00:35 -07:00
hw_breakpoint.h
…
hw_irq.h
Merge branch 'x86/ras' into x86/core, to fix conflicts
2015-06-07 15:35:27 +02:00
hypertransport.h
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hypervisor.h
hypervisor/x86/xen: Unset X86_BUG_SYSRET_SS_ATTRS on Xen PV guests
2015-05-05 18:27:43 +01:00
i8259.h
…
ia32_unistd.h
…
ia32.h
…
idle.h
…
imr.h
…
inat_types.h
…
inat.h
…
init.h
…
insn.h
…
inst.h
…
intel_mid_vrtc.h
…
intel_pmc_ipc.h
intel_pmc_ipc: Update kerneldoc formatting
2015-07-09 11:23:15 -07:00
intel_scu_ipc.h
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intel-mid.h
…
io_apic.h
x86: Cleanup irq_domain ops
2015-04-24 15:36:55 +02:00
io.h
Merge tag 'libnvdimm-for-4.2' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/nvdimm
2015-06-29 10:34:42 -07:00
iomap.h
…
iommu_table.h
…
iommu.h
…
iosf_mbi.h
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ipi.h
…
irq_regs.h
…
irq_remapping.h
iommu, x86: Provide irq_remapping_cap() interface
2015-06-12 11:33:52 +02:00
irq_vectors.h
Merge branch 'x86/ras' into x86/core, to fix conflicts
2015-06-07 15:35:27 +02:00
irq_work.h
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irq.h
x86/irq: Define a global vector for VT-d Posted-Interrupts
2015-05-19 15:51:17 +02:00
irqdomain.h
x86/irq: Move irqdomain specific code into asm/irqdomain.h
2015-04-24 15:36:55 +02:00
irqflags.h
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ist.h
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jump_label.h
…
kasan.h
x86/kasan: Fix KASAN shadow region page tables
2015-07-06 14:53:13 +02:00
kbdleds.h
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Kbuild
mm: clean up per architecture MM hook header files
2015-07-17 16:39:53 -07:00
kdebug.h
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kexec-bzimage64.h
…
kexec.h
…
kgdb.h
…
kmap_types.h
…
kmemcheck.h
…
kprobes.h
…
kvm_emulate.h
KVM: x86: stubs for SMM support
2015-06-04 16:01:45 +02:00
kvm_guest.h
…
kvm_host.h
KVM: count number of assigned devices
2015-07-10 13:25:26 +02:00
kvm_para.h
…
lguest_hcall.h
…
lguest.h
…
linkage.h
…
livepatch.h
livepatch: x86: make kASLR logic more accurate
2015-04-29 16:51:33 +02:00
local64.h
…
local.h
…
mach_timer.h
…
mach_traps.h
…
math_emu.h
…
mc146818rtc.h
…
mce.h
x86/mce: Add infrastructure to support Local MCE
2015-06-07 15:33:14 +02:00
microcode_amd.h
x86/microcode: Correct CPU family related variable types
2015-06-07 15:38:15 +02:00
microcode_intel.h
x86/microcode/intel: Rename get_matching_sig()
2015-05-18 09:32:37 +02:00
microcode.h
x86/microcode: Parse built-in microcode early
2015-05-06 11:24:53 +02:00
misc.h
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mmconfig.h
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mmu_context.h
x86/ldt: Make modify_ldt synchronous
2015-07-31 10:23:23 +02:00
mmu.h
x86/ldt: Make modify_ldt synchronous
2015-07-31 10:23:23 +02:00
mmx.h
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mmzone_32.h
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mmzone_64.h
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mmzone.h
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module.h
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mpspec_def.h
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mpspec.h
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mpx.h
x86/mpx: Support 32-bit binaries on 64-bit kernels
2015-06-09 12:24:34 +02:00
mshyperv.h
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msi.h
x86/MSI: Use hierarchical irqdomains to manage MSI interrupts
2015-04-24 15:36:49 +02:00
msidef.h
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msr-index.h
x86/uapi: Do not export <asm/msr-index.h> as part of the user API headers
2015-06-07 15:36:04 +02:00
msr.h
Merge branch 'x86/asm' into x86/core, to prepare for new patch
2015-06-08 20:48:20 +02:00
mtrr.h
x86/mm/mtrr: Avoid #ifdeffery with phys_wc_to_mtrr_index()
2015-05-27 14:41:00 +02:00
mutex_32.h
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mutex_64.h
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mutex.h
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mwait.h
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nmi.h
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nops.h
…
numa_32.h
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numa.h
…
olpc_ofw.h
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olpc.h
…
page_32_types.h
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page_32.h
…
page_64_types.h
…
page_64.h
…
page_types.h
…
page.h
…
paravirt_types.h
Merge branch 'locking/core' into x86/core, to prepare for dependent patch
2015-06-03 10:07:35 +02:00
paravirt.h
locking/pvqspinlock: Rename QUEUED_SPINLOCK to QUEUED_SPINLOCKS
2015-05-11 09:52:09 +02:00
parport.h
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pat.h
x86/mm/pat: Emulate PAT when it is disabled
2015-06-07 15:28:52 +02:00
pci_64.h
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pci_x86.h
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pci-direct.h
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pci-functions.h
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pci.h
Merge branch 'for-4.2/sg' of git://git.kernel.dk/linux-block
2015-06-25 15:22:36 -07:00
percpu.h
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perf_event_p4.h
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perf_event.h
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pgalloc.h
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pgtable_32_types.h
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pgtable_32.h
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pgtable_64_types.h
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pgtable_64.h
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pgtable_types.h
x86/mm/pat: Add pgprot_writethrough()
2015-06-07 15:28:58 +02:00
pgtable-2level_types.h
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pgtable-2level.h
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pgtable-3level_types.h
…
pgtable-3level.h
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pgtable.h
mm: clarify that the function operates on hugepage pte
2015-06-24 17:49:44 -07:00
platform_sst_audio.h
…
pm-trace.h
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pmc_atom.h
…
posix_types.h
…
preempt.h
preempt: Use preempt_schedule_context() as the official tracing preemption point
2015-06-07 15:57:42 +02:00
probe_roms.h
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processor-cyrix.h
…
processor-flags.h
…
processor.h
x86/fpu, sched: Dynamically allocate 'struct fpu'
2015-07-18 03:42:35 +02:00
prom.h
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proto.h
x86/asm/entry: Untangle 'system_call' into two entry points: entry_SYSCALL_64 and entry_INT80_32
2015-06-08 09:14:21 +02:00
ptrace.h
x86/asm/entry/32: Really make user_mode() work correctly for VM86 mode
2015-05-29 09:46:40 +02:00
pvclock-abi.h
x86: kvmclock: add flag to indicate pvclock counts from zero
2015-05-29 14:01:39 +02:00
pvclock.h
x86: kvmclock: drop rdtsc_barrier()
2015-05-07 11:29:48 +02:00
qrwlock.h
…
qspinlock_paravirt.h
locking/pvqspinlock, x86: Implement the paravirt qspinlock call patching
2015-05-08 12:37:09 +02:00
qspinlock.h
locking/pvqspinlock, x86: Implement the paravirt qspinlock call patching
2015-05-08 12:37:09 +02:00
realmode.h
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reboot_fixups.h
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reboot.h
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required-features.h
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rio.h
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rmwcc.h
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rtc.h
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rwsem.h
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seccomp.h
…
sections.h
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segment.h
x86/asm/irq: Stop relying on magic JMP behavior for early_idt_handlers
2015-06-02 09:39:40 +02:00
serial.h
serial: 8250: remove Kconfig indirection
2015-05-06 22:27:00 +02:00
setup_arch.h
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setup.h
x86: kaslr: fix build due to missing ALIGN definition
2015-04-29 21:54:54 +02:00
shmparam.h
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sigcontext.h
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sigframe.h
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sighandling.h
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signal.h
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simd.h
x86/fpu: Rename i387.h to fpu/api.h
2015-05-19 15:47:30 +02:00
smap.h
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smp.h
x86: Remove cpu_sibling_mask() and cpu_core_mask()
2015-05-27 15:22:17 +02:00
sparsemem.h
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special_insns.h
x86/mm: Add kerneldoc comments for pcommit_sfence()
2015-05-11 10:38:44 +02:00
spinlock_types.h
locking/pvqspinlock: Rename QUEUED_SPINLOCK to QUEUED_SPINLOCKS
2015-05-11 09:52:09 +02:00
spinlock.h
locking/pvqspinlock: Rename QUEUED_SPINLOCK to QUEUED_SPINLOCKS
2015-05-11 09:52:09 +02:00
sta2x11.h
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stackprotector.h
x86/fpu: Move various internal function prototypes to fpu/internal.h
2015-05-19 15:47:48 +02:00
stacktrace.h
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string_32.h
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string_64.h
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string.h
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suspend_32.h
x86/fpu: Rename i387.h to fpu/api.h
2015-05-19 15:47:30 +02:00
suspend_64.h
x86/fpu: Rename i387.h to fpu/api.h
2015-05-19 15:47:30 +02:00
suspend.h
…
svm.h
…
swiotlb.h
…
switch_to.h
…
sync_bitops.h
…
sys_ia32.h
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syscall.h
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syscalls.h
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sysfb.h
…
tce.h
…
thread_info.h
x86/entry: Define 'cpu_current_top_of_stack' for 64-bit code
2015-05-08 13:50:02 +02:00
time.h
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timer.h
…
timex.h
…
tlb.h
…
tlbflush.h
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topology.h
Merge branch 'x86-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2015-06-22 17:59:09 -07:00
trace_clock.h
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traps.h
x86/mce/amd: Introduce deferred error interrupt handler
2015-05-07 10:23:32 +02:00
tsc.h
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uaccess_32.h
Merge branch 'x86-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2015-06-22 17:59:09 -07:00
uaccess_64.h
…
uaccess.h
mm/uaccess, mm/fault: Clarify that uaccess may only sleep if pagefaults are enabled
2015-05-19 08:39:14 +02:00
unaligned.h
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unistd.h
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uprobes.h
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user32.h
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user_32.h
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user_64.h
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user.h
x86/fpu: Rename xsave.header::xstate_bv to 'xfeatures'
2015-05-19 15:47:35 +02:00
vdso.h
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vga.h
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vgtod.h
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virtext.h
…
vm86.h
…
vmx.h
…
vsyscall.h
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vvar.h
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word-at-a-time.h
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x2apic.h
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x86_init.h
x86: Remove more unmodified io_apic_ops
2015-04-24 15:36:54 +02:00
xor_32.h
x86/fpu: Rename i387.h to fpu/api.h
2015-05-19 15:47:30 +02:00
xor_64.h
…
xor_avx.h
x86/fpu: Rename i387.h to fpu/api.h
2015-05-19 15:47:30 +02:00
xor.h
x86/fpu: Rename i387.h to fpu/api.h
2015-05-19 15:47:30 +02:00