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8e94de44ea748e6ea2b7e922b3203fd6b8403102
kernel/arch/arm/include/asm
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Vincent Whitchurch b8252ec6dd ARM: 8813/1: Make aligned 2-byte getuser()/putuser() atomic on ARMv6+ 
[ Upstream commit 344eb5539abf3e0b6ce22568c03e86450073e097 ]

getuser() and putuser() (and there underscored variants) use two
strb[t]/ldrb[t] instructions when they are asked to get/put 16-bits.
This means that the read/write is not atomic even when performed to a
16-bit-aligned address.

This leads to problems with vhost: vhost uses __getuser() to read the
vring's 16-bit avail.index field, and if it happens to observe a partial
update of the index, wrong descriptors will be used which will lead to a
breakdown of the virtio communication.  A similar problem exists for
__putuser() which is used to write to the vring's used.index field.

The reason these functions use strb[t]/ldrb[t] is because strht/ldrht
instructions did not exist until ARMv6T2/ARMv7.  So we should be easily
able to fix this on ARMv7.  Also, since all ARMv6 processors also don't
actually use the unprivileged instructions anymore for uaccess (since
CONFIG_CPU_USE_DOMAINS is not used) we can easily fix them too.

Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2019-12-13 08:51:10 +01:00
..
hardware
Merge branches 'fixes', 'misc', 'sa1111' and 'sa1100-for-next' into for-next
2018-01-21 15:38:10 +00:00
mach
Merge branch 'x86-timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2018-08-13 18:28:19 -07:00
xen
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
arch_gicv3.h
irqchip/gic-v3: Probe for SCR_EL3 being clear before resetting AP0Rn
2018-03-22 13:46:18 +00:00
arch_timer.h
Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
2017-11-15 10:56:56 -08:00
arm-cci.h
…
asm-offsets.h
…
assembler.h
ARM: 8796/1: spectre-v1,v1.1: provide helpers for address sanitization
2019-02-20 10:25:37 +01:00
atomic.h
atomics/treewide: Clean up '*_andnot()' ifdeffery
2018-06-21 14:25:24 +02:00
auxvec.h
…
barrier.h
ARM: avoid Cortex-A9 livelock on tight dmb loops
2019-04-05 22:33:12 +02:00
bitops.h
ARM: 8785/1: use compiler built-ins for ffs and fls
2018-07-30 11:45:53 +01:00
bitrev.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
bL_switcher.h
…
bug.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
bugs.h
ARM: bugs: hook processor bug checking into SMP and suspend paths
2018-05-31 10:39:29 +01:00
cache.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
cacheflush.h
docs: Fix some broken references
2018-06-15 18:10:01 -03:00
cachetype.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
checksum.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
clocksource.h
…
cmpxchg.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
compiler.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
cp15.h
ARM: vdso: Remove dependency with the arch_timer driver internals
2019-05-31 06:46:11 -07:00
cpu.h
…
cpufeature.h
…
cpuidle.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
cputype.h
ARM: split out processor lookup
2019-02-20 10:25:38 +01:00
cti.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
dcc.h
…
delay.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
device.h
…
div64.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
dma-contiguous.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
dma-direct.h
dma/direct: Handle the memory encryption bit in common code
2018-03-20 10:01:59 +01:00
dma-iommu.h
kmemcheck: remove annotations
2017-11-15 18:21:04 -08:00
dma-mapping.h
dma-direct: rename dma_noop to dma_direct
2018-01-15 09:35:06 +01:00
dma.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
dmi.h
…
domain.h
…
ecard.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
edac.h
…
efi.h
efi: Deduplicate efi_open_volume()
2018-07-22 14:13:43 +02:00
elf.h
Merge branch 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm
2017-11-16 12:50:35 -08:00
entry-macro-multi.S
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
exception.h
ARM: probes: avoid adding kprobes to sensitive kernel-entry/exit code
2017-12-17 22:14:21 +00:00
fb.h
…
fiq.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
firmware.h
…
fixmap.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
flat.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
floppy.h
…
fncpy.h
…
fpstate.h
…
ftrace.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
futex.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
glue-cache.h
ARM: 8725/1: Add Broadcom Brahma-B15 readahead cache support
2017-12-17 22:15:35 +00:00
glue-df.h
…
glue-pf.h
…
glue-proc.h
…
glue.h
…
gpio.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
hardirq.h
ARM: prevent tracing IPI_CPU_BACKTRACE
2019-06-15 11:54:00 +02:00
highmem.h
Merge branch 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm
2017-11-16 12:50:35 -08:00
hugetlb-3level.h
…
hugetlb.h
…
hw_breakpoint.h
perf/hw_breakpoint: Remove default hw_breakpoint_arch_parse()
2018-06-26 09:07:58 +02:00
hw_irq.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
hwcap.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
hypervisor.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
ide.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
idmap.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
insn.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
io.h
…
irq_work.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
irq.h
ARM: 8824/1: fix a migrating irq bug when hotplug cpu
2019-03-23 20:09:48 +01:00
irqflags.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
jump_label.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
Kbuild
time: Add an asm-generic/compat.h file
2018-04-19 13:28:51 +02:00
kexec.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
kgdb.h
ARM: 8764/1: kgdb: fix NUMREGBYTES so that gdb_regs[] is the correct size
2018-05-19 11:53:46 +01:00
kmap_types.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
kprobes.h
ARM/kprobes: Remove jprobe arm implementation
2018-06-21 12:33:07 +02:00
kvm_arm.h
arm: KVM: Fix VTTBR_BADDR_MASK BUG_ON off-by-one
2017-11-29 16:46:18 +01:00
kvm_asm.h
Merge branches 'fixes', 'misc' and 'spectre' into for-linus
2018-06-05 10:03:27 +01:00
kvm_coproc.h
…
kvm_emulate.h
Merge tag 'kvmarm-for-v4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD
2018-08-22 14:07:56 +02:00
kvm_host.h
arm/arm64: KVM: Allow a VCPU to fully reset itself
2019-03-23 20:09:43 +01:00
kvm_hyp.h
KVM: arm/arm64: Avoid VGICv3 save/restore on VHE with no IRQs
2018-03-19 10:53:21 +00:00
kvm_mmio.h
…
kvm_mmu.h
KVM: arm/arm64: vgic-its: Take the srcu lock when writing to guest memory
2019-05-04 09:20:13 +02:00
limits.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
linkage.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
mc146818rtc.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
mcpm.h
…
mcs_spinlock.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
memblock.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
memory.h
linux/const.h: move UL() macro to include/linux/const.h
2018-04-11 10:28:38 -07:00
mmu_context.h
…
mmu.h
Merge branch 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm
2017-11-16 12:50:35 -08:00
module.h
ARM: module: fix modsign build error
2018-07-09 20:29:49 +02:00
mpu.h
ARM: 8757/1: NOMMU: Support PMSAv8 MPU
2018-05-19 11:53:46 +01:00
mtd-xip.h
…
neon.h
…
nwflash.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
opcodes-sec.h
…
opcodes-virt.h
…
opcodes.h
…
outercache.h
…
page-nommu.h
…
page.h
…
paravirt.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
patch.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
pci.h
PCI: remove PCI_DMA_BUS_IS_PHYS
2018-05-07 07:15:41 +02:00
percpu.h
…
perf_event.h
…
pgalloc.h
kmemcheck: stop using GFP_NOTRACK and SLAB_NOTRACK
2017-11-15 18:21:04 -08:00
pgtable-2level-hwdef.h
…
pgtable-2level-types.h
…
pgtable-2level.h
mm: make the __PAGETABLE_PxD_FOLDED defines non-empty
2018-12-29 13:37:57 +01:00
pgtable-3level-hwdef.h
…
pgtable-3level-types.h
…
pgtable-3level.h
mm: introduce ARCH_HAS_PTE_SPECIAL
2018-06-07 17:34:35 -07:00
pgtable-hwdef.h
…
pgtable-nommu.h
…
pgtable.h
KVM: arm/arm64: Limit icache invalidation to prefetch aborts
2018-01-08 15:20:45 +01:00
probes.h
ARM/kprobes: Remove jprobe arm implementation
2018-06-21 12:33:07 +02:00
proc-fns.h
ARM: spectre-v2: per-CPU vtables to work around big.Little systems
2019-02-20 10:25:38 +01:00
processor.h
ARM: avoid Cortex-A9 livelock on tight dmb loops
2019-04-05 22:33:12 +02:00
procinfo.h
…
prom.h
…
psci.h
…
ptdump.h
ARM: 8737/1: mm: dump: add checking for writable and executable
2018-01-21 15:32:20 +00:00
ptrace.h
linux/compiler.h: Split into compiler.h and compiler_types.h
2017-10-24 13:17:32 +02:00
sections.h
ARM: probes: avoid adding kprobes to sensitive kernel-entry/exit code
2017-12-17 22:14:21 +00:00
secure_cntvoff.h
ARM: smp: Add initialization of CNTVOFF
2018-05-08 14:50:42 +02:00
set_memory.h
…
setup.h
…
shmparam.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
signal.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
smp_plat.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
smp_scu.h
Merge tag 'armsoc-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
2017-11-16 14:05:12 -08:00
smp_twd.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
smp.h
ARM: 8708/1: NOMMU: Rework MPU to be mostly done in C
2017-10-23 16:58:59 +01:00
sparsemem.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
spinlock_types.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
spinlock.h
Merge branch 'linus' into locking/core, to resolve conflicts
2017-11-07 10:32:44 +01:00
stackprotector.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
stacktrace.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
stage2_pgtable.h
…
string.h
ARM: 8745/1: get rid of __memzero()
2018-01-21 15:37:56 +00:00
suspend.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
swab.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
switch_to.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
sync_bitops.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
syscall.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
system_info.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
system_misc.h
ARM: spectre-v2: harden user aborts in kernel space
2018-05-31 10:40:32 +01:00
tcm.h
…
therm.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
thread_info.h
ARM: 8791/1: vfp: use __copy_to_user() when saving VFP state
2019-02-20 10:25:36 +01:00
thread_notify.h
…
timex.h
…
tlb.h
arm/asm/tlb.h: Fix build error implicit func declaration
2018-07-25 12:09:09 +02:00
tlbflush.h
…
tls.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
topology.h
Merge branch 'pm-cpufreq'
2017-11-13 01:34:49 +01:00
traps.h
ARM: probes: avoid adding kprobes to sensitive kernel-entry/exit code
2017-12-17 22:14:21 +00:00
trusted_foundations.h
…
uaccess.h
ARM: 8813/1: Make aligned 2-byte getuser()/putuser() atomic on ARMv6+
2019-12-13 08:51:10 +01:00
ucontext.h
Merge branch 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm
2017-11-16 12:50:35 -08:00
unaligned.h
ARM: 8715/1: add a private asm/unaligned.h
2017-10-24 10:33:23 +01:00
unified.h
ARM: 8723/2: always assume the "unified" syntax for assembly code
2017-12-17 22:14:21 +00:00
unistd.h
…
unwind.h
…
uprobes.h
…
user.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
v7m.h
ARM: 8830/1: NOMMU: Toggle only bits in EXC_RETURN we are really care of
2019-04-05 22:33:12 +02:00
vdso_datapage.h
…
vdso.h
ARM: 8748/1: mm: Define vdso_start, vdso_end as array
2018-03-24 14:27:49 +00:00
vfp.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
vfpmacros.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
vga.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
virt.h
…
word-at-a-time.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
xor.h
…