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Kees Cook aadf156747
locking/refcounts, x86/asm: Implement fast refcount overflow protection 
This implements refcount_t overflow protection on x86 without a noticeable
performance impact, though without the fuller checking of REFCOUNT_FULL.

This is done by duplicating the existing atomic_t refcount implementation
but with normally a single instruction added to detect if the refcount
has gone negative (e.g. wrapped past INT_MAX or below zero). When detected,
the handler saturates the refcount_t to INT_MIN / 2. With this overflow
protection, the erroneous reference release that would follow a wrap back
to zero is blocked from happening, avoiding the class of refcount-overflow
use-after-free vulnerabilities entirely.

Only the overflow case of refcounting can be perfectly protected, since
it can be detected and stopped before the reference is freed and left to
be abused by an attacker. There isn't a way to block early decrements,
and while REFCOUNT_FULL stops increment-from-zero cases (which would
be the state _after_ an early decrement and stops potential double-free
conditions), this fast implementation does not, since it would require
the more expensive cmpxchg loops. Since the overflow case is much more
common (e.g. missing a "put" during an error path), this protection
provides real-world protection. For example, the two public refcount
overflow use-after-free exploits published in 2016 would have been
rendered unexploitable:

  http://perception-point.io/2016/01/14/analysis-and-exploitation-of-a-linux-kernel-vulnerability-cve-2016-0728/

  http://cyseclabs.com/page?n=02012016

This implementation does, however, notice an unchecked decrement to zero
(i.e. caller used refcount_dec() instead of refcount_dec_and_test() and it
resulted in a zero). Decrements under zero are noticed (since they will
have resulted in a negative value), though this only indicates that a
use-after-free may have already happened. Such notifications are likely
avoidable by an attacker that has already exploited a use-after-free
vulnerability, but it's better to have them reported than allow such
conditions to remain universally silent.

On first overflow detection, the refcount value is reset to INT_MIN / 2
(which serves as a saturation value) and a report and stack trace are
produced. When operations detect only negative value results (such as
changing an already saturated value), saturation still happens but no
notification is performed (since the value was already saturated).

On the matter of races, since the entire range beyond INT_MAX but before
0 is negative, every operation at INT_MIN / 2 will trap, leaving no
overflow-only race condition.

As for performance, this implementation adds a single "js" instruction
to the regular execution flow of a copy of the standard atomic_t refcount
operations. (The non-"and_test" refcount_dec() function, which is uncommon
in regular refcount design patterns, has an additional "jz" instruction
to detect reaching exactly zero.) Since this is a forward jump, it is by
default the non-predicted path, which will be reinforced by dynamic branch
prediction. The result is this protection having virtually no measurable
change in performance over standard atomic_t operations. The error path,
located in .text.unlikely, saves the refcount location and then uses UD0
to fire a refcount exception handler, which resets the refcount, handles
reporting, and returns to regular execution. This keeps the changes to
.text size minimal, avoiding return jumps and open-coded calls to the
error reporting routine.

Example assembly comparison:

refcount_inc() before:

  .text:
  ffffffff81546149:       f0 ff 45 f4             lock incl -0xc(%rbp)

refcount_inc() after:

  .text:
  ffffffff81546149:       f0 ff 45 f4             lock incl -0xc(%rbp)
  ffffffff8154614d:       0f 88 80 d5 17 00       js     ffffffff816c36d3
  ...
  .text.unlikely:
  ffffffff816c36d3:       48 8d 4d f4             lea    -0xc(%rbp),%rcx
  ffffffff816c36d7:       0f ff                   (bad)

These are the cycle counts comparing a loop of refcount_inc() from 1
to INT_MAX and back down to 0 (via refcount_dec_and_test()), between
unprotected refcount_t (atomic_t), fully protected REFCOUNT_FULL
(refcount_t-full), and this overflow-protected refcount (refcount_t-fast):

  2147483646 refcount_inc()s and 2147483647 refcount_dec_and_test()s:
		    cycles		protections
  atomic_t           82249267387	none
  refcount_t-fast    82211446892	overflow, untested dec-to-zero
  refcount_t-full   144814735193	overflow, untested dec-to-zero, inc-from-zero

This code is a modified version of the x86 PAX_REFCOUNT atomic_t
overflow defense from the last public patch of PaX/grsecurity, based
on my understanding of the code. Changes or omissions from the original
code are mine and don't reflect the original grsecurity/PaX code. Thanks
to PaX Team for various suggestions for improvement for repurposing this
code to be a refcount-only protection.

Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: David S. Miller <davem@davemloft.net>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Elena Reshetova <elena.reshetova@intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: Hans Liljestrand <ishkamiel@gmail.com>
Cc: James Bottomley <James.Bottomley@hansenpartnership.com>
Cc: Jann Horn <jannh@google.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Manfred Spraul <manfred@colorfullife.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Serge E. Hallyn <serge@hallyn.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: arozansk@redhat.com
Cc: axboe@kernel.dk
Cc: kernel-hardening@lists.openwall.com
Cc: linux-arch <linux-arch@vger.kernel.org>
Link: http://lkml.kernel.org/r/20170815161924.GA133115@beast
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2023-04-30 19:49:33 +03:00
..
crypto x86/fpu: Rename i387.h to fpu/api.h 2015-05-19 15:47:30 +02:00
fpu x86/fpu: Add might_fault() to user_insn() 2019-02-12 19:44:53 +01:00
numachip x86/numachip: Introduce Numachip2 timer mechanisms 2015-09-22 22:25:33 +02:00
trace x86/fpu: Remove struct fpu::counter 2018-10-13 09:18:58 +02:00
uv x86/platform/UV: Use efi_runtime_lock to serialise BIOS calls 2019-02-20 10:18:33 +01:00
xen This is the 4.9.169 stable release 2019-04-17 11:40:33 +02:00
a.out-core.h
acenv.h ACPICA: Linux: Add support to exclude <asm/acenv.h> inclusion. 2014-07-23 01:10:44 +02:00
acpi.h x86/cpu: Rename cpu_data.x86_mask to cpu_data.x86_stepping 2018-02-22 15:43:55 +01:00
agp.h
alternative-asm.h x86/alternatives: Fix alt_max_short macro to really be a max() 2017-10-18 09:35:41 +02:00
alternative.h This is the 4.9.77 stable release 2018-01-17 10:29:45 +01:00
amd_nb.h x86/mce/AMD: Document some functionality 2016-03-08 11:48:15 +01:00
apb_timer.h
apic.h x86/apic: Silence -Wtype-limits compiler warnings 2019-08-06 18:29:37 +02:00
apic_flat_64.h
apicdef.h
apm.h x86/apm: Don't access __preempt_count with zeroed fs 2018-07-25 11:23:58 +02:00
arch_hweight.h x86/hweight: Get rid of the special calling convention 2016-06-08 15:01:02 +02:00
archrandom.h x86, asm: Use CC_SET()/CC_OUT() and static_cpu_has() in archrandom.h 2016-06-08 12:41:20 -07:00
asm-offsets.h
asm-prototypes.h Revert "x86/retpoline: Simplify vmexit_fill_RSB()" 2018-03-18 11:18:52 +01:00
asm.h locking/refcounts, x86/asm: Implement fast refcount overflow protection 2023-04-30 19:49:33 +03:00
atomic.h locking/x86: Remove the unused atomic_inc_short() methd 2020-01-12 11:24:19 +01:00
atomic64_32.h locking/atomic, arch/x86: Implement atomic{,64}_fetch_{add,sub,and,or,xor}() 2016-06-16 10:48:31 +02:00
atomic64_64.h x86/atomic: Fix smp_mb__{before,after}_atomic() 2019-11-25 09:53:11 +01:00
barrier.h x86/atomic: Fix smp_mb__{before,after}_atomic() 2019-11-25 09:53:11 +01:00
bios_ebda.h x86/boot: Reorganize and clean up the BIOS area reservation code 2016-07-21 10:11:57 +02:00
bitops.h x86, asm: Use CC_SET()/CC_OUT() in <asm/bitops.h> 2016-06-08 12:41:20 -07:00
boot.h x86/KASLR: Build identity mappings on demand 2016-05-07 07:38:39 +02:00
bootparam_utils.h x86/boot: Add missing bootparam that breaks boot on some platforms 2019-09-21 07:14:09 +02:00
bug.h x86: always define BUG() and HAVE_ARCH_BUG, even with !CONFIG_BUG 2014-04-07 16:36:10 -07:00
bugs.h x86/mm/mpx: Work around MPX erratum SKD046 2016-05-20 09:07:40 +02:00
cache.h
cacheflush.h remove stray include of asm/uaccess.h from cacheflush.h 2016-09-27 21:15:22 -04:00
calgary.h x86/platform/calgary: Constify cal_chipset_ops structures 2015-11-29 08:50:58 +01:00
ce4100.h
checksum.h
checksum_32.h x86/uaccess: Move thread_info::addr_limit to thread_struct 2016-07-15 10:26:30 +02:00
checksum_64.h ipv6: Pass proto to csum_ipv6_magic as __u8 instead of unsigned short 2016-03-13 23:55:13 -04:00
clocksource.h x86/vdso: Remove direct HPET access through the vDSO 2016-04-13 10:28:34 +02:00
cmdline.h x86/boot: Add early cmdline parsing for options with arguments 2018-01-05 15:46:32 +01:00
cmpxchg.h x86/cmpxchg, locking/atomics: Remove superfluous definitions 2016-09-30 10:56:01 +02:00
cmpxchg_32.h x86/cpufeature: Remove unused and seldomly used cpu_has_xx macros 2015-12-19 11:49:55 +01:00
cmpxchg_64.h x86/cpufeature: Remove unused and seldomly used cpu_has_xx macros 2015-12-19 11:49:55 +01:00
compat.h x86/coredump: Always use user_regs_struct for compat_elf_gregset_t 2016-11-24 06:01:05 +01:00
cpu.h xen: features and fixes for 4.8-rc0 2016-07-27 11:35:37 -07:00
cpu_device_id.h
cpufeature.h x86/cpufeatures: Add CPUID_7_EDX CPUID leaf 2018-02-13 12:35:58 +01:00
cpufeatures.h x86/vdso: Use RDPID in preference to LSL when available 2020-02-28 15:42:10 +01:00
cpumask.h
crash.h x86/crash: Add a forward declaration of struct kimage 2020-01-04 13:39:57 +01:00
current.h
debugreg.h perf/x86/amd: AMD support for bp_len > HW_BREAKPOINT_LEN_8 2014-12-03 15:14:26 +01:00
delay.h x86/asm/delay: Introduce an MWAITX-based delay with a configurable timer 2015-08-22 14:52:16 +02:00
desc.h kaiser: cleanups while trying for gold link 2018-01-05 15:46:33 +01:00
desc_defs.h x86/signal/64: Fix SS if needed when delivering a 64-bit signal 2016-02-17 08:32:11 +01:00
device.h x86/PCI: Allow DMA ops specific to a PCI domain 2016-01-15 13:54:55 -06:00
disabled-features.h x86/cpufeatures: Add CPUID_7_EDX CPUID leaf 2018-02-13 12:35:58 +01:00
div64.h
dma-mapping.h dma-mapping: use unsigned long for dma_attrs 2016-08-04 08:50:07 -04:00
dma.h x86/mm: Fix zone ranges boot printout 2014-12-11 11:35:02 +01:00
dmi.h x86: Don't include linux/irq.h from asm/hardirq.h 2018-08-15 18:14:52 +02:00
dwarf2.h x86/asm: Remove the xyz_cfi macros from dwarf2.h 2015-10-14 16:56:28 +02:00
e820.h x86/e820: Prepare e280 code for switch to dynamic storage 2016-09-21 15:02:12 +02:00
edac.h EDAC: Cleanup atomic_scrub mess 2015-05-28 15:31:53 +02:00
efi.h x86/speculation: Use IBRS if available before calling into firmware 2018-03-18 11:18:52 +01:00
elf.h x86/fsgsbase/64: Report FSBASE and GSBASE correctly in core dumps 2017-09-20 08:19:57 +02:00
emergency-restart.h reboot: move arch/x86 reboot= handling to generic kernel 2013-07-09 10:33:29 -07:00
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
export.h x86: move exports to actual definitions 2016-08-07 23:47:15 -04:00
extable.h x86: separate extable.h, switch sections.h to it 2016-09-27 21:15:23 -04:00
fb.h x86: Use new cache mode type in include/asm/fb.h 2014-11-16 11:04:24 +01:00
fixmap.h x86/mm: Use the correct function type for native_set_fixmap() 2020-01-04 13:39:22 +01:00
floppy.h x86: Remove deprecated IRQF_DISABLED 2014-03-04 21:47:51 +01:00
frame.h x86/asm: Add C versions of frame pointer macros 2016-01-19 12:59:07 +01:00
ftrace.h ftrace/x86: Implement HAVE_FUNCTION_GRAPH_RET_ADDR_PTR 2016-08-24 12:15:15 +02:00
futex.h futex: Remove duplicated code and fix undefined behaviour 2018-05-19 10:27:00 +02:00
gart.h
genapic.h
geode.h
hardirq.h x86: Don't include linux/irq.h from asm/hardirq.h 2018-08-15 18:14:52 +02:00
highmem.h kmap_atomic_to_page() has no users, remove it 2015-11-09 15:11:24 -08:00
hpet.h timers/x86/hpet: Type adjustments 2015-10-21 11:17:32 +02:00
hugetlb.h Merge branch 'x86/urgent' into x86/asm, to fix semantic conflict 2016-04-22 10:13:53 +02:00
hw_breakpoint.h perf/x86/amd: AMD support for bp_len > HW_BREAKPOINT_LEN_8 2014-12-03 15:14:26 +01:00
hw_irq.h KAISER: Kernel Address Isolation 2018-01-05 15:46:32 +01:00
hypertransport.h
hypervisor.h virt, sched: Add generic vCPU pinning support 2016-09-05 13:52:38 +02:00
i8259.h x86: i8259: Add missing include file 2018-08-17 20:59:28 +02:00
ia32.h x86/headers: Remove <asm/sigcontext.h> references on the kernel side 2015-09-08 10:06:05 +02:00
ia32_unistd.h
idle.h ANDROID: Move x86_64 idle notifiers to generic 2017-01-27 13:51:37 -08:00
imr.h x86/platform/intel/quark: Drop IMR lock bit support 2016-02-23 07:37:23 +01:00
inat.h x86/insn: Add AVX-512 support to the instruction decoder 2016-07-21 09:37:11 -03:00
inat_types.h
init.h x86/power/64: Always create temporary identity mapping correctly 2016-08-08 22:04:30 +02:00
insn.h kprobes/x86: Prohibit probing on exception masking instructions 2019-11-25 09:53:12 +01:00
inst.h x86, crc32-pclmul: Fix build with older binutils 2013-05-30 16:36:23 -07:00
intel-family.h x86/cpu: Add Atom Tremont (Jacobsville) 2019-11-06 12:18:02 +01:00
intel-mid.h x86/platform/intel-mid: Retrofit pci_platform_pm_ops ->get_state hook 2016-11-07 13:06:59 +01:00
intel_mid_vrtc.h intel_mid: Renamed *mrst* to *intel_mid* 2013-10-17 16:40:36 -07:00
intel_pmc_ipc.h intel_pmc_ipc: Update kerneldoc formatting 2015-07-09 11:23:15 -07:00
intel_pt.h perf/x86/intel/pt: Add interface to stop Intel PT logging 2015-11-23 09:58:26 +01:00
intel_punit_ipc.h platform:x86: add Intel P-Unit mailbox IPC driver 2016-01-19 15:49:36 -08:00
intel_scu_ipc.h x86/platform/intel-mid: Implement power off sequence 2016-09-08 08:03:58 +02:00
intel_telemetry.h intel_telemetry: Constify telemetry_core_ops structures 2016-05-05 13:58:55 -07:00
io.h x86/io: Add "memory" clobber to insb/insw/insl/outsb/outsw/outsl 2017-09-02 07:07:53 +02:00
io_apic.h x86: Cleanup irq_domain ops 2015-04-24 15:36:55 +02:00
iomap.h
iommu.h
iommu_table.h x86/iommu: Fix header comments regarding standard and _FINISH macros 2015-04-09 10:56:31 +02:00
iosf_mbi.h ACPI / LPSS: override power state for LPSS DMA device 2016-01-07 14:11:32 +01:00
ipi.h x86/apic: Deinline __default_send_IPI_*, save ~200 bytes 2016-03-08 12:26:41 +01:00
irq.h nmi_backtrace: add more trigger_*_cpu_backtrace() methods 2016-10-07 18:46:30 -07:00
irq_regs.h
irq_remapping.h irq_remapping: move structs outside #ifdef 2015-10-01 15:06:42 +02:00
irq_vectors.h x86/vm86: Move the vm86 IRQ definitions to vm86.h 2015-07-31 13:31:10 +02:00
irq_work.h x86/cpufeature: Replace cpu_has_apic with boot_cpu_has() usage 2016-04-13 11:37:41 +02:00
irqdomain.h x86/irq: Move irqdomain specific code into asm/irqdomain.h 2015-04-24 15:36:55 +02:00
irqflags.h x86/speculation/mds: Conditionally clear CPU buffers on idle entry 2019-05-14 19:19:40 +02:00
ist.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
jump_label.h x86/asm: Add asm macros for static keys/jump labels 2015-11-24 09:56:44 +01:00
kaiser.h KPTI: Rename to PAGE_TABLE_ISOLATION 2018-01-05 15:46:35 +01:00
kasan.h x86/kasan: Define KASAN_SHADOW_OFFSET per architecture 2015-08-22 14:54:55 +02:00
kaslr.h x86/mm/64: Enable KASLR for vmemmap memory region 2016-08-10 16:10:06 +02:00
kbdleds.h
Kbuild kbuild, x86: Track generated headers with generated-y 2016-07-07 15:58:44 +02:00
kdebug.h x86/dumpstack: Remove show_trace() 2016-08-18 18:41:27 +02:00
kexec-bzimage64.h kexec-bzImage64: support for loading bzImage using 64bit entry 2014-08-08 15:57:33 -07:00
kexec.h x86/kexec: Correct KEXEC_BACKUP_SRC_END off-by-one error 2019-11-25 09:53:47 +01:00
kgdb.h x86/asm: Stop depending on ptrace.h in alternative.h 2016-04-29 11:56:40 +02:00
kmap_types.h
kmemcheck.h
kprobes.h x86: fix up a few misc stack pointer vs thread_info confusions 2016-06-24 16:55:53 -07:00
kvm_emulate.h kvm: x86: use correct privilege level for sgdt/sidt/fxsave/fxrstor access 2018-06-16 09:52:34 +02:00
kvm_guest.h x86: kvm guest: pvclock vsyscall support 2012-11-27 23:29:10 -02:00
kvm_host.h kvm: x86: mmu: Recovery of shattered NX large pages 2019-11-16 10:29:57 +01:00
kvm_page_track.h KVM: x86: cleanup the page tracking SRCU instance 2017-03-31 10:31:45 +02:00
kvm_para.h x86/mm: Always enable CONFIG_DEBUG_RODATA and remove the Kconfig option 2016-02-22 08:51:38 +01:00
lguest.h lguest: Map switcher text R/O 2016-01-12 12:17:28 +01:00
lguest_hcall.h lguest: remove NOTIFY call and eventfd facility. 2015-02-11 16:47:46 +10:30
linkage.h x86/entry/32: Remove asmlinkage_protect() 2016-05-05 08:37:31 +02:00
livepatch.h x86: Audit and remove any remaining unnecessary uses of module.h 2016-07-14 15:07:00 +02:00
local.h x86, asm: change the GEN_*_RMWcc() macros to not quote the condition 2016-06-08 12:41:20 -07:00
local64.h
mach_timer.h
mach_traps.h
math_emu.h x86/vm86: Clean up vm86.h includes 2015-07-31 13:31:10 +02:00
mc146818rtc.h rtc: cmos: move mc146818rtc code out of asm-generic/rtc.h 2016-06-04 00:20:00 +02:00
mce.h x86/MCE: Export memory_error() 2017-06-07 12:07:47 +02:00
microcode.h x86/microcode: Fix suspend to RAM with builtin microcode 2016-06-08 11:04:19 +02:00
microcode_amd.h x86/microcode/AMD: Change load_microcode_amd()'s param to bool to fix preemptibility bug 2018-02-25 11:05:56 +01:00
microcode_intel.h x86/microcode/intel: Add a helper which gives the microcode revision 2019-05-14 19:19:33 +02:00
misc.h x86: Improve the printout of the SMP bootup CPU table 2013-09-28 10:10:26 +02:00
mmconfig.h x86: delete __cpuinit usage from all x86 files 2013-07-14 19:36:56 -04:00
mmu.h x86/mm: Give each mm TLB flush generation a unique ID 2018-03-11 16:21:30 +01:00
mmu_context.h x86/pkeys: Do not special case protection key 0 2018-05-22 16:57:58 +02:00
mmx.h
mmzone.h
mmzone_32.h x86, platforms: Remove NUMAQ 2014-02-27 08:07:39 -08:00
mmzone_64.h
module.h x86, 386 removal: Remove CONFIG_M386 from Kconfig 2012-11-29 13:23:01 -08:00
mpspec.h x86/acpi: Introduce persistent storage for cpuid <-> apicid mapping 2016-09-21 21:18:38 +02:00
mpspec_def.h
mpx.h x86/mpx: Support 32-bit binaries on 64-bit kernels 2015-06-09 12:24:34 +02:00
mshyperv.h mshyperv: fix recognition of Hyper-V guest crash MSR's 2015-08-04 22:30:44 -07:00
msi.h x86/irq: Export functions to allow MSI domains in modules 2015-12-20 12:40:49 +01:00
msidef.h
msr-index.h x86/bugs: Add ITLB_MULTIHIT bug infrastructure 2019-11-16 10:29:54 +01:00
msr-trace.h x86, tracing, perf: Add trace point for MSR accesses 2015-12-06 12:56:10 +01:00
msr.h x86: Introduce barrier_nospec 2018-02-13 12:36:00 +01:00
mtrr.h x86/mtrr: Fix Xorg crashes in Qemu sessions 2016-03-29 12:23:26 +02:00
mutex.h
mutex_32.h locking/mutex: Optimize mutex_trylock() fast-path 2016-06-08 15:17:01 +02:00
mutex_64.h locking/mutex: Optimize mutex_trylock() fast-path 2016-06-08 15:17:01 +02:00
mwait.h x86/asm: Fix MWAITX C-state hint value 2019-10-17 13:42:46 -07:00
nmi.h x86/nmi: Push duration printk() to irq context 2014-02-09 13:17:22 +01:00
nops.h
nospec-branch.h x86/speculation/taa: Add mitigation for TSX Async Abort 2019-11-16 10:29:43 +01:00
numa.h x86/mm/numa: Drop dead code and rename setup_node_data() to setup_alloc_data() 2014-09-16 08:55:10 +02:00
numa_32.h
olpc.h
olpc_ofw.h
orc_types.h objtool: sync up with the 4.14.47 version of objtool 2018-06-05 10:28:57 +02:00
page.h x86/boot: Split out kernel_ident_mapping_init() 2016-05-07 07:38:39 +02:00
page_32.h x86/mm: Implement ASLR for hugetlb mappings 2013-11-19 14:24:50 +01:00
page_32_types.h x86/speculation/l1tf: Increase 32bit PAE __PHYSICAL_PAGE_SHIFT 2018-08-15 18:14:44 +02:00
page_64.h x86_64,vsyscall: Make vsyscall emulation configurable 2014-11-03 21:44:57 +01:00
page_64_types.h x86_64: increase stack size for KASAN_EXTRA 2019-03-13 14:04:58 -07:00
page_types.h x86/mm: Align macro defines 2015-12-19 11:53:40 +01:00
paravirt.h x86/paravirt, objtool: Annotate indirect calls 2018-03-18 11:18:52 +01:00
paravirt_types.h This is the 4.9.88 stable release 2018-03-18 12:07:50 +01:00
parport.h X86: drivers: remove __dev* attributes. 2013-01-03 15:57:04 -08:00
pat.h x86/mm/pat: Don't report PAT on CPUs that don't support it 2017-07-15 12:16:17 +02:00
pci-direct.h
pci-functions.h
pci.h x86/PCI: VMD: Request userspace control of PCIe hotplug indicators 2016-09-23 08:41:08 -05:00
pci_64.h
pci_x86.h Revert "PCI, x86: Implement pcibios_alloc_irq() and pcibios_free_irq()" 2016-02-27 08:52:20 -06:00
percpu.h x86/percpu: Fix this_cpu_read() 2018-11-10 07:43:01 -08:00
perf_event.h perf/x86/amd/ibs: Fix sample bias for dispatched micro-ops 2019-09-21 07:14:19 +02:00
perf_event_p4.h percpu: Resolve ambiguities in __get_cpu_var/cpumask_var_t 2014-08-28 08:58:57 -04:00
pgalloc.h kaiser: allocate pgd with order 0 when pti=off 2018-02-13 12:35:55 +01:00
pgtable-2level.h x86/speculation/l1tf: Protect PROT_NONE PTEs against speculation 2018-08-15 18:14:44 +02:00
pgtable-2level_types.h x86: expose number of page table levels on Kconfig level 2015-04-14 16:49:02 -07:00
pgtable-3level.h x86/pae: use 64 bit atomic xchg function in native_ptep_get_and_clear 2018-09-15 09:43:01 +02:00
pgtable-3level_types.h x86: expose number of page table levels on Kconfig level 2015-04-14 16:49:02 -07:00
pgtable-invert.h x86/speculation/l1tf: Exempt zeroed PTEs from inversion 2018-08-18 10:47:20 +02:00
pgtable.h x86/speculation/l1tf: Fix up pte->pfn conversion for PAE 2018-09-15 09:42:54 +02:00
pgtable_32.h x86: Remove set_pmd_pfn 2014-09-01 10:15:31 +02:00
pgtable_32_types.h x86: mm: Re-use the early_ioremap fixed area 2014-11-03 13:40:44 +01:00
pgtable_64.h x86/mm: Use WRITE_ONCE() when setting PTEs 2019-05-14 19:19:33 +02:00
pgtable_64_types.h x86/mm/64: Enable KASLR for vmemmap memory region 2016-08-10 16:10:06 +02:00
pgtable_types.h mm: Preserve _PAGE_DEVMAP across mprotect() calls 2018-10-20 09:51:32 +02:00
pkeys.h x86/pkeys: Do not special case protection key 0 2018-05-22 16:57:58 +02:00
platform_sst_audio.h ASoc: Intel: Atom: add deep buffer definitions for atom platforms 2015-12-19 11:49:56 +00:00
pm-trace.h PM / sleep: add pm-trace support for suspending phase 2015-03-18 15:54:27 +01:00
pmc_atom.h x86/platform/intel/pmc_atom: Add Cherrytrail PMC interface 2015-07-06 18:39:38 +02:00
pmc_core.h platform/x86: Add PMC Driver for Intel Core SoC 2016-05-27 11:47:56 -07:00
pmem.h x86, pmem: Fix cache flushing for iovec write < 8 bytes 2017-05-20 14:28:36 +02:00
posix_types.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
preempt.h BACKPORT: x86/asm: Fix inline asm call constraints for Clang 2017-10-16 15:30:38 -07:00
probe_roms.h
processor-cyrix.h
processor-flags.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
processor.h x86/speculation/taa: Add mitigation for TSX Async Abort 2019-11-16 10:29:43 +01:00
prom.h x86, devicetree, irq: Use common mechanism to support irqdomain 2014-06-21 23:05:43 +02:00
proto.h x86/entry: Vastly simplify SYSENTER TF (single-step) handling 2016-03-10 09:48:13 +01:00
ptrace.h kprobes, x86/ptrace.h: Make regs_get_kernel_stack_nth() not fault on bad stack 2019-11-28 18:28:29 +01:00
pvclock-abi.h Revert "KVM: x86: zero kvmclock_offset when vcpu0 initializes kvmclock system MSR" 2015-09-28 13:06:37 +02:00
pvclock.h KVM: x86: introduce get_kvmclock_ns 2016-09-20 09:26:15 +02:00
qrwlock.h locking/qrwlock: Implement queue_write_unlock() using smp_store_release() 2015-08-12 11:59:05 +02:00
qspinlock.h locking/qspinlock, x86: Provide liveness guarantee 2018-12-21 14:11:34 +01:00
qspinlock_paravirt.h locking/qspinlock: Merge 'struct __qspinlock' into 'struct qspinlock' 2018-12-21 14:11:33 +01:00
realmode.h x86/asm/head: Rename 'stack_start' -> 'initial_stack' 2016-08-18 18:41:29 +02:00
reboot.h x86/mce: Handle broadcasted MCE gracefully with kexec 2018-03-22 09:17:38 +01:00
reboot_fixups.h
refcount.h locking/refcounts, x86/asm: Implement fast refcount overflow protection 2023-04-30 19:49:33 +03:00
required-features.h x86/cpufeatures: Add CPUID_7_EDX CPUID leaf 2018-02-13 12:35:58 +01:00
rio.h
rmwcc.h x86, asm: change GEN_*_RMWcc() to use CC_SET()/CC_OUT() 2016-06-08 12:41:20 -07:00
rwsem.h BACKPORT: x86/asm: Fix inline asm call constraints for Clang 2017-10-16 15:30:38 -07:00
seccomp.h x86: switch to using asm-generic for seccomp.h 2015-04-17 09:04:10 -04:00
sections.h x86: separate extable.h, switch sections.h to it 2016-09-27 21:15:23 -04:00
segment.h x86/arch_prctl/64: Remove FSBASE/GSBASE < 4G optimization 2016-04-29 11:56:41 +02:00
serial.h serial: 8250: remove Kconfig indirection 2015-05-06 22:27:00 +02:00
setup.h x86/asm: Stop depending on ptrace.h in alternative.h 2016-04-29 11:56:40 +02:00
setup_arch.h
shmparam.h
sigcontext.h x86/headers: Remove <asm/sigcontext.h> references on the kernel side 2015-09-08 10:06:05 +02:00
sigframe.h x86/headers: Remove <asm/sigcontext.h> references on the kernel side 2015-09-08 10:06:05 +02:00
sighandling.h x86/signal/64: Re-add support for SS in the 64-bit signal context 2016-02-17 08:32:11 +01:00
signal.h x86/signal: Add SA_{X32,IA32}_ABI sa_flags 2016-09-14 21:28:11 +02:00
simd.h x86/fpu: Rename i387.h to fpu/api.h 2015-05-19 15:47:30 +02:00
smap.h x86/cpufeature: Carve out X86_FEATURE_* 2016-01-30 11:22:17 +01:00
smp.h x86/apic: Drop logical_smp_processor_id() inline 2019-11-12 19:16:08 +01:00
sparsemem.h
spec-ctrl.h x86/speculation: Prevent stale SPEC_CTRL msr content 2019-05-14 19:19:39 +02:00
special_insns.h x86/asm: Get rid of __read_cr4_safe() 2016-09-30 12:40:12 +02:00
spinlock.h x86, locking/spinlocks: Remove ticket (spin)lock implementation 2016-09-30 10:56:00 +02:00
spinlock_types.h x86, locking/spinlocks: Remove ticket (spin)lock implementation 2016-09-30 10:56:00 +02:00
sta2x11.h
stackprotector.h x86/asm/tsc: Rename native_read_tsc() to rdtsc() 2015-07-06 15:23:28 +02:00
stacktrace.h x86/unwind: Disable KASAN checks for non-current tasks 2019-05-08 07:19:06 +02:00
string.h
string_32.h
string_64.h x86/mce: Improve memcpy_mcsafe() 2016-09-05 11:47:31 +02:00
suspend.h
suspend_32.h x86/power: Make restore_processor_context() sane 2019-04-17 08:36:38 +02:00
suspend_64.h x86/power: Make restore_processor_context() sane 2019-04-17 08:36:38 +02:00
svm.h x86/kvm/svm: Simplify cpu_has_svm() 2016-06-16 00:04:31 +02:00
swiotlb.h dma-mapping: use unsigned long for dma_attrs 2016-08-04 08:50:07 -04:00
switch_to.h sched/x86: Save [ER]FLAGS on context switch 2019-05-21 18:48:56 +02:00
sync_bitops.h x86, bitops: remove use of "sbb" to return CF 2016-06-08 12:41:20 -07:00
sys_ia32.h unify compat fanotify_mark(2), switch to COMPAT_SYSCALL_DEFINE 2013-05-09 13:46:38 -04:00
syscall.h x86/asm: Move 'status' from thread_struct to thread_info 2018-02-13 12:35:59 +01:00
syscalls.h x86/entry: Use SYSCALL_DEFINE() macros for sys_modify_ldt() 2017-12-09 22:01:49 +01:00
sysfb.h x86: sysfb: move EFI quirks from efifb to sysfb 2013-08-02 16:17:47 -07:00
tce.h
text-patching.h x86/asm: Stop depending on ptrace.h in alternative.h 2016-04-29 11:56:40 +02:00
thread_info.h This is the 4.9.176 stable release 2019-05-14 21:04:42 +02:00
time.h
timer.h Merge branch 'x86-cleanups-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-01-20 12:03:57 -08:00
timex.h
tlb.h x86-32: Fix possible incomplete TLB invalidate with PAE pagetables 2013-04-12 16:56:47 -07:00
tlbflush.h x86/speculation: Prepare for conditional IBPB in switch_mm() 2019-05-14 19:19:38 +02:00
topology.h x86/topology: Provide topology_smt_supported() 2018-08-15 18:14:45 +02:00
trace_clock.h
traps.h x86/mce: Make machine check speculation protected 2018-01-23 19:57:09 +01:00
tsc.h x86/tsc: Remove the unused check_tsc_disabled() 2016-07-15 10:35:08 +02:00
uaccess.h This is the 4.9.194 stable release 2019-09-21 08:01:07 +02:00
uaccess_32.h x86/uaccess: Use __uaccess_begin_nospec() and uaccess_try_nospec 2018-02-13 12:36:00 +01:00
uaccess_64.h x86/uaccess: Use __uaccess_begin_nospec() and uaccess_try_nospec 2018-02-13 12:36:00 +01:00
unaligned.h
unistd.h x86/syscalls: Add compat_sys_preadv64v2/compat_sys_pwritev64v2 2016-07-15 10:30:26 +02:00
unwind.h x86/unwind: Fix oprofile module link error 2016-10-06 09:52:20 +02:00
unwind_hints.h objtool: sync up with the 4.14.47 version of objtool 2018-06-05 10:28:57 +02:00
uprobes.h uprobes/x86: Rename arch_uprobe->def to ->defparam, minor comment updates 2014-06-05 16:21:57 +02:00
user.h x86/fpu: Rename xsave.header::xstate_bv to 'xfeatures' 2015-05-19 15:47:35 +02:00
user32.h
user_32.h
user_64.h
vdso.h x86/arch_prctl/vdso: Add ARCH_MAP_VDSO_* 2016-09-14 21:28:09 +02:00
vga.h x86, ia64: Move EFI_FB vga_default_device() initialization to pci_vga_fixup() 2014-07-10 16:48:48 -06:00
vgtod.h x86/vdso: Use RDPID in preference to LSL when available 2020-02-28 15:42:10 +01:00
virtext.h x86/kvm/svm: Simplify cpu_has_svm() 2016-06-16 00:04:31 +02:00
vm86.h x86/vm86: Rename vm86->v86flags and v86mask 2015-07-31 13:31:11 +02:00
vmx.h x86/speculation: Use ARCH_CAPABILITIES to skip L1D flush on vmentry 2018-08-15 18:14:53 +02:00
vsyscall.h kaiser: fix compile error without vsyscall 2018-02-17 13:21:12 +01:00
vvar.h x86,vdso: Use LSL unconditionally for vgetcpu 2014-11-03 13:41:53 +01:00
word-at-a-time.h
x2apic.h
x86_init.h Merge branch 'x86-timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-07-25 19:41:35 -07:00
xor.h x86/fpu: Rename i387.h to fpu/api.h 2015-05-19 15:47:30 +02:00
xor_32.h x86/cpufeature: Replace cpu_has_xmm with boot_cpu_has() usage 2016-04-13 11:37:40 +02:00
xor_64.h x86/xor: Add alternative SSE implementation only prefetching once per 64-byte line 2013-01-25 09:23:50 +01:00
xor_avx.h x86/cpufeature: Replace cpu_has_avx with boot_cpu_has() usage 2016-04-13 11:37:40 +02:00