Now we hit the usual ASoC-fix-flood in the middle of release.
Most of changes are trivial and device-specific, while one significant
change is the fix for unbalanced of_graph_*() refcounts. This
involved with the change in the graph API itself that had been a bit
messy.
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Merge tag 'sound-4.13-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
Pull sound fixes from Takashi Iwai:
"Now we hit the usual ASoC-fix-flood in the middle of release.
Most of the changes are trivial and device-specific, while one
significant change is the fix for unbalanced of_graph_*() refcounts.
This involved a change in the graph API itself that had been a bit
messy"
* tag 'sound-4.13-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
ALSA: hda - Fix speaker output from VAIO VPCL14M1R
device property: Fix usecount for of_graph_get_port_parent()
ASoC: rt5665: fix wrong register for bclk ratio control
ASoC: Intel: Use MCLK instead of BLCK as the sysclock for RT5514 codec on kabylake platform
ASoC: Intel: Enabling ASRC for RT5663 codec on kabylake platform
ASoC: codecs: msm8916-analog: fix DIG_CLK_CTL_RXD3_CLK_EN define
ASoC: Intel: Skylake: Fix missing sentinels in sst_acpi_mach
ASoC: sh: hac: add missing "int ret"
ASoC: samsung: odroid: Fix EPLL frequency values
ASoC: sgtl5000: Use snd_soc_kcontrol_codec()
ASoC: rt5665: fix GPIO6 pin function define
ASoC: ux500: Restore platform DAI assignments
ASoC: fix pcm-creation regression
ASoC: do not close shared backend dailink
ASoC: pxa: SND_PXA2XX_SOC should depend on HAS_DMA
ASoC: Intel: Skylake: Fix default dma_buffer_size
ASoC: rt5663: Update the HW default values based on the shipping version
ASoC: imx-ssi: add check on platform_get_irq return value
Including:
- Fix a scheduling-while-atomic bug in the AMD IOMMU driver. It
was found after the checker was enabled earlier.
- A fix for the virtual APIC code in the AMD IOMMU driver which
delivers device interrupts directly into KVM guests for
assigned devices.
- Fixes for the recently merged lock-less page-table code for
ARM. The redundant TLB syncs got reverted and locks added
again around the TLB sync code.
- Fix for error handling in arm_smmu_add_device()
- Address sanitization fix for arm io-pgtable code
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Merge tag 'iommu-fixes-v4.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu
Pull IOMMU fixes from Joerg Roedel:
- fix a scheduling-while-atomic bug in the AMD IOMMU driver. It was
found after the checker was enabled earlier.
- a fix for the virtual APIC code in the AMD IOMMU driver which
delivers device interrupts directly into KVM guests for assigned
devices.
- fixes for the recently merged lock-less page-table code for ARM. The
redundant TLB syncs got reverted and locks added again around the TLB
sync code.
- fix for error handling in arm_smmu_add_device()
- address sanitization fix for arm io-pgtable code
* tag 'iommu-fixes-v4.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu:
iommu/amd: Fix schedule-while-atomic BUG in initialization code
iommu/amd: Enable ga_log_intr when enabling guest_mode
iommu/io-pgtable: Sanitise map/unmap addresses
iommu/arm-smmu: Fix the error path in arm_smmu_add_device
Revert "iommu/io-pgtable: Avoid redundant TLB syncs"
iommu/mtk: Avoid redundant TLB syncs locally
iommu/arm-smmu: Reintroduce locking around TLB sync operations
- Fix NULL pointer dereference for block I/O during hotplug
MMC host:
- sdhci-of-at91: Fix card detect for non-removable cards
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Merge tag 'mmc-v4.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc
Pull MMC fixes from Ulf Hansson:
"A couple of mmc fixes intended for v4.13-rc4.
MMC core:
- Fix NULL pointer dereference for block I/O during hotplug
MMC host:
- sdhci-of-at91: Fix card detect for non-removable cards"
* tag 'mmc-v4.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc:
mmc: block: bypass the queue even if usage is present for hotplug
mmc: sdhci-of-at91: force card detect value for non removable devices
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Merge tag 'drm-fixes-for-v4.13-rc4' of git://people.freedesktop.org/~airlied/linux
Pull drm fixes from Dave Airlie:
"Either my email ate everything or everyone is on holidays, either way
all I can find is some lonely AMD fixes"
[ Europe might be on vacation, and the Pacific NW is too hot for work. ]
* tag 'drm-fixes-for-v4.13-rc4' of git://people.freedesktop.org/~airlied/linux:
drm/amdgpu: Use list_del_init in amdgpu_mn_unregister
drm/amdgpu: Fix undue fallthroughs in golden registers initialization
drm/amdgpu: fix header on gfx9 clear state
Fixes for recently merged code:
- a fix for the _PAGE_DEVMAP support, which was breaking KVM on Power9 radix
- avoid a (harmless) lockdep warning in the early SMP code
- return failure for some uses of dma_set_mask() rather than falling back to 32-bits
- fix stack setup in watchdog soft_nmi_common() to use emergency stack
- fix of_irq_to_resource() error check in of_fsl_spi_probe()
Two fixes going to stable:
- fix saving of Transactional Memory SPRs in core dump
- fix __check_irq_replay missing decrementer interrupt
And two misc:
- fix 64-bit boot wrapper build with non-biarch compiler
- work around a POWER9 PMU hang after state-loss idle
Thanks to:
Alistair Popple, Aneesh Kumar K.V, Cyril Bur, Gustavo Romero, Jose Ricardo
Ziviani, Laurent Vivier, Nicholas Piggin, Oliver O'Halloran, Sergei Shtylyov,
Suraj Jitindar Singh, Thomas Gleixner.
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Merge tag 'powerpc-4.13-5' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
Pull powerpc fixes from Michael Ellerman:
"Fixes for recently merged code:
- a fix for the _PAGE_DEVMAP support, which was breaking KVM on
Power9 radix
- avoid a (harmless) lockdep warning in the early SMP code
- return failure for some uses of dma_set_mask() rather than falling
back to 32-bits
- fix stack setup in watchdog soft_nmi_common() to use emergency
stack
- fix of_irq_to_resource() error check in of_fsl_spi_probe()
Two fixes going to stable:
- fix saving of Transactional Memory SPRs in core dump
- fix __check_irq_replay missing decrementer interrupt
And two misc:
- fix 64-bit boot wrapper build with non-biarch compiler
- work around a POWER9 PMU hang after state-loss idle
Thanks to: Alistair Popple, Aneesh Kumar K.V, Cyril Bur, Gustavo
Romero, Jose Ricardo Ziviani, Laurent Vivier, Nicholas Piggin, Oliver
O'Halloran, Sergei Shtylyov, Suraj Jitindar Singh, Thomas Gleixner"
* tag 'powerpc-4.13-5' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
powerpc/64: Fix __check_irq_replay missing decrementer interrupt
powerpc/perf: POWER9 PMU stops after idle workaround
powerpc/83xx/mpc832x_rdb: fix of_irq_to_resource() error check
powerpc/64s: Fix stack setup in watchdog soft_nmi_common()
powerpc/powernv/pci: Return failure for some uses of dma_set_mask()
powerpc/boot: Fix 64-bit boot wrapper build with non-biarch compiler
powerpc/smp: Call smp_ops->setup_cpu() directly on the boot CPU
powerpc/tm: Fix saving of TM SPRs in core dump
powerpc/mm: Fix pmd/pte_devmap() on non-leaf entries
Mikael Pettersson reported that some test programs in the strace-4.18
testsuite cause an OOPS.
After some debugging it turns out that garbage values are returned
when an exception occurs, causing the fixup memset() to be run with
bogus arguments.
The problem is that two of the exception handler stubs write the
successfully copied length into the wrong register.
Fixes: ee841d0aff ("sparc64: Convert U3copy_{from,to}_user to accurate exception reporting.")
Reported-by: Mikael Pettersson <mikpelinux@gmail.com>
Tested-by: Mikael Pettersson <mikpelinux@gmail.com>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
The bitmask used to define these values produces overflow, as seen by
this compiler warning:
arch/arm64/kernel/head.S:47:8: warning:
integer overflow in preprocessor expression
#elif (PAGE_OFFSET & 0x1fffff) != 0
^~~~~~~~~~~
arch/arm64/include/asm/memory.h:52:46: note:
expanded from macro 'PAGE_OFFSET'
#define PAGE_OFFSET (UL(0xffffffffffffffff) << (VA_BITS -
1))
~~~~~~~~~~~~~~~~~~ ^
It would be preferrable to use GENMASK_ULL() instead, but it's not set
up to be used from assembly (the UL() macro token pastes UL suffixes
when not included in assembly sources).
Suggested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Suggested-by: Yury Norov <ynorov@caviumnetworks.com>
Suggested-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
In a system with DBM (dirty bit management) capable agents there is a
possible race between a CPU executing ptep_set_access_flags() (maybe
non-DBM capable) and a hardware update of the dirty state (clearing of
PTE_RDONLY). The scenario:
a) the pte is writable (PTE_WRITE set), clean (PTE_RDONLY set) and old
(PTE_AF clear)
b) ptep_set_access_flags() is called as a result of a read access and it
needs to set the pte to writable, clean and young (PTE_AF set)
c) a DBM-capable agent, as a result of a different write access, is
marking the entry as young (setting PTE_AF) and dirty (clearing
PTE_RDONLY)
The current ptep_set_access_flags() implementation would set the
PTE_RDONLY bit in the resulting value overriding the DBM update and
losing the dirty state.
This patch fixes such race by setting PTE_RDONLY to the most permissive
(lowest value) of the current entry and the new one.
Fixes: 66dbd6e61a ("arm64: Implement ptep_set_access_flags() for hardware AF/DBM")
Cc: Will Deacon <will.deacon@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Steve Capper <steve.capper@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
They should be used only when an actual
remote-endpoint is connected.
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Merge tag 'davinci-fixes-for-v4.13' of git://git.kernel.org/pub/scm/linux/kernel/git/nsekhar/linux-davinci into fixes
Pull "DaVinci fixes for v4.13" from Sekhar Nori:
Drop unused VPIF endpoints from device-tree.
They should be used only when an actual
remote-endpoint is connected.
* tag 'davinci-fixes-for-v4.13' of git://git.kernel.org/pub/scm/linux/kernel/git/nsekhar/linux-davinci:
ARM: dts: da850-lcdk: drop unused VPIF endpoints
ARM: dts: da850-evm: drop unused VPIF endpoints
Two fixes to correct the EMAC blocks memory region size to match the
datasheet. One that converts raw A83T clock indices to macros from the
clk dt-binding header, completing the A83T sunxi-ng clk driver.
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Merge tag 'sunxi-fixes-for-4.13' of https://git.kernel.org/pub/scm/linux/kernel/git/sunxi/linux into fixes
Pull "Allwinner fixes for 4.13" from Chen-Yu Tsai:
Two fixes to correct the EMAC blocks memory region size to match the
datasheet. One that converts raw A83T clock indices to macros from the
clk dt-binding header, completing the A83T sunxi-ng clk driver.
* tag 'sunxi-fixes-for-4.13' of https://git.kernel.org/pub/scm/linux/kernel/git/sunxi/linux:
ARM: dts: sun8i: a83t: Switch to CCU device tree binding macros
arm64: allwinner: sun50i-a64: Correct emac register size
ARM: dts: sunxi: h3/h5: Correct emac register size
When resuming, set up registers that have been lost in the sleep state.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fix deadlock in regulator quirk for R-Car Gen 2 SoCs
The da9063/da9210 regulator quirk for R-Car Gen2 boards uses a bus
notifier, and unregisters the notifier when it is no longer needed.
However, a notifier must not be unregistered from within the call chain.
This bug went unnoticed, as blocking_notifier_chain_unregister() didn't
take the semaphore during early boot. This is no longer the case as of
upstream commit 1c3c5eab17 ("sched/core: Enable might_sleep() and
smp_processor_id() checks early") and a deadlock occurs.
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Merge tag 'renesas-fixes3-for-v4.13' of https://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas into fixes
Pull "Third Round of Renesas ARM Based SoC Fixes for v4.13" from Simon Horman:
Fix deadlock in regulator quirk for R-Car Gen 2 SoCs
The da9063/da9210 regulator quirk for R-Car Gen2 boards uses a bus
notifier, and unregisters the notifier when it is no longer needed.
However, a notifier must not be unregistered from within the call chain.
This bug went unnoticed, as blocking_notifier_chain_unregister() didn't
take the semaphore during early boot. This is no longer the case as of
upstream commit 1c3c5eab17 ("sched/core: Enable might_sleep() and
smp_processor_id() checks early") and a deadlock occurs.
* tag 'renesas-fixes3-for-v4.13' of https://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas:
ARM: shmobile: rcar-gen2: Fix deadlock in regulator quirk
All the fixes are for ARM64 mvebu:
- Fix the RTC interrupt on A7K/A8K which was missed when switching
from GIC to ICU
- Mark the A7K/A8K crypto engine as dma coherent
- Fix the number of GPIO on south bridge on Armada 3700
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Merge tag 'mvebu-fixes-4.13-2' of git://git.infradead.org/linux-mvebu into fixes
Pull "mvebu fixes for 4.13 (part 2)" from Gregory CLEMENT:
All the fixes are for ARM64 mvebu:
- Fix the RTC interrupt on A7K/A8K which was missed when switching
from GIC to ICU
- Mark the A7K/A8K crypto engine as dma coherent
- Fix the number of GPIO on south bridge on Armada 3700
* tag 'mvebu-fixes-4.13-2' of git://git.infradead.org/linux-mvebu:
ARM64: dts: marvell: armada-37xx: Fix the number of GPIO on south bridge
arm64: dts: marvell: mark the cp110 crypto engine as dma coherent
arm64: dts: marvell: use ICU for the CP110 slave RTC
- 2 minor DT fixes
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Merge tag 'amlogic-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/khilman/linux-amlogic into fixes
Pull "Amlogic fixes for v4.13-rc" from Kevin Hilman:
- 2 minor DT fixes
* tag 'amlogic-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/khilman/linux-amlogic:
ARM64: dts: meson-gxl-s905x-libretech-cc: fixup board definition
ARM64: dts: meson-gx: use specific compatible for the AO pwms
showed a wrong value, so fix it before it gets copy-pasted
to much.
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Merge tag 'v4.13-rockchip-dts32fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mmind/linux-rockchip into fixes
Pull "Rockchip dts32 fixes for 4.13" from Heiko Stübner:
Fix for the recently added mali dt support. The example
showed a wrong value, so fix it before it gets copy-pasted
to much.
* tag 'v4.13-rockchip-dts32fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mmind/linux-rockchip:
ARM: dts: rockchip: fix mali gpu node on rk3288
dt-bindings: gpu: drop wrong compatible from midgard binding example
If the decrementer wraps again and de-asserts the decrementer
exception while hard-disabled, __check_irq_replay() has a test to
notice the wrap when interrupts are re-enabled.
The decrementer check must be done when clearing the PACA_IRQ_HARD_DIS
flag, not when the PACA_IRQ_DEC flag is tested. Previously this worked
because the decrementer interrupt was always the first one checked
after clearing the hard disable flag, but HMI check was moved ahead of
that, which introduced this bug.
This can cause a missed decrementer interrupt if we soft-disable
interrupts then take an HMI which is recorded in irq_happened, then
hard-disable interrupts for > 4s to wrap the decrementer.
Fixes: e0e0d6b739 ("powerpc/64: Replay hypervisor maintenance interrupt first")
Cc: stable@vger.kernel.org # v4.9+
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
POWER9 DD2 PMU can stop after a state-loss idle in some conditions.
A solution is to set then clear MMCRA[60] after wake from state-loss
idle. MMCRA[60] is a non-architected bit, see the user manual for
details.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Acked-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Reviewed-by: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
Acked-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Just a few small fixes for 4.13.
* 'drm-fixes-4.13' of git://people.freedesktop.org/~agd5f/linux:
drm/amdgpu: Use list_del_init in amdgpu_mn_unregister
drm/amdgpu: Fix undue fallthroughs in golden registers initialization
drm/amdgpu: fix header on gfx9 clear state
Merge misc fixes from Andrew Morton:
"15 fixes"
[ This does not merge the "fortify: use WARN instead of BUG for now"
patch, which needs a bit of extra work to build cleanly with all
configurations. Arnd is on it. - Linus ]
* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
ocfs2: don't clear SGID when inheriting ACLs
mm: allow page_cache_get_speculative in interrupt context
userfaultfd: non-cooperative: flush event_wqh at release time
ipc: add missing container_of()s for randstruct
cpuset: fix a deadlock due to incomplete patching of cpusets_enabled()
userfaultfd_zeropage: return -ENOSPC in case mm has gone
mm: take memory hotplug lock within numa_zonelist_order_handler()
mm/page_io.c: fix oops during block io poll in swapin path
zram: do not free pool->size_class
kthread: fix documentation build warning
kasan: avoid -Wmaybe-uninitialized warning
userfaultfd: non-cooperative: notify about unmap of destination during mremap
mm, mprotect: flush TLB if potentially racing with a parallel reclaim leaving stale TLB entries
pid: kill pidhash_size in pidhash_init()
mm/hugetlb.c: __get_user_pages ignores certain follow_hugetlb_page errors
- Fix a device ID of Hisilicon Hip07/08 in the ACPI APD (AMD SoC)
driver (Hanjun Guo).
- Fix list corruption (introduced during the 4.11 cycle) in the ACPI
LPSS (Intel SoC) driver (Hans de Goede).
- Fix PCC mailbox handling code crash during initialization when
PCCT is not present and PCC channel 0 is requested (Hoan Tran).
- Fix a WDAT watchdog initialization issue causing platform device
creation to fail due to partially overlapping address ranges in
resources (Ryan Kennedy).
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Merge tag 'acpi-4.13-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull ACPI fixes from Rafael Wysocki:
"These fix two issues in the ACPI SoC drivers (Intel LPSS and AMD APD),
a crash in the PCC mailbox initialization code and a WDAT watchdog
initialization failure.
Specifics:
- Fix a device ID of Hisilicon Hip07/08 in the ACPI APD (AMD SoC)
driver (Hanjun Guo).
- Fix list corruption (introduced during the 4.11 cycle) in the ACPI
LPSS (Intel SoC) driver (Hans de Goede).
- Fix PCC mailbox handling code crash during initialization when PCCT
is not present and PCC channel 0 is requested (Hoan Tran).
- Fix a WDAT watchdog initialization issue causing platform device
creation to fail due to partially overlapping address ranges in
resources (Ryan Kennedy)"
* tag 'acpi-4.13-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
ACPI: APD: Fix HID for Hisilicon Hip07/08
mailbox: pcc: Fix crash when request PCC channel 0
ACPI / watchdog: Fix init failure with overlapping register regions
ACPI / LPSS: Only call pwm_add_table() for the first PWM controller
- Fix the handling of the scaling_cur_freq cpufreq policy attribute
on x86 systems with the MPERF/APERF registers present to make it
behave more as expected after recent changes (Rafael Wysocki).
- Drop a leftover callback from the intel_pstate driver which also
prevents the cpuinfo_cur_freq cpufreq policy attribute from being
incorrectly exposed when intel_pstate works in the active mode
(Rafael Wysocki).
- Add a missing piece describing the cpuinfo_cur_freq policy
attribute to cpufreq documentation (Rafael Wysocki).
- Fix up a recently added part of the Thunderbolt driver to avoid
aborting system suspends if its mailbox commands time out (Rafael
Wysocki).
- Update device runtime PM framework documentation to reflect the
current behavior of the code (Johan Hovold).
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Merge tag 'pm-4.13-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull power management fixes from Rafael Wysocki:
"These fix two cpufreq issues, one introduced recently and one related
to recent changes, fix cpufreq documentation, fix up recently added
code in the Thunderbolt driver and update runtime PM framework
documentation.
Specifics:
- Fix the handling of the scaling_cur_freq cpufreq policy attribute
on x86 systems with the MPERF/APERF registers present to make it
behave more as expected after recent changes (Rafael Wysocki).
- Drop a leftover callback from the intel_pstate driver which also
prevents the cpuinfo_cur_freq cpufreq policy attribute from being
incorrectly exposed when intel_pstate works in the active mode
(Rafael Wysocki).
- Add a missing piece describing the cpuinfo_cur_freq policy
attribute to cpufreq documentation (Rafael Wysocki).
- Fix up a recently added part of the Thunderbolt driver to avoid
aborting system suspends if its mailbox commands time out (Rafael
Wysocki).
- Update device runtime PM framework documentation to reflect the
current behavior of the code (Johan Hovold)"
* tag 'pm-4.13-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
thunderbolt: icm: Ignore mailbox errors in icm_suspend()
cpufreq: x86: Make scaling_cur_freq behave more as expected
PM / runtime: Document new pm_runtime_set_suspended() constraint
cpufreq: docs: Add missing cpuinfo_cur_freq description
cpufreq: intel_pstate: Drop ->get from intel_pstate structure
- Yet another race with VM destruction plugged
- A set of small vgic fixes
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Merge tag 'kvm-arm-for-v4.13-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm
KVM/ARM Fixes for v4.13-rc4
- Yet another race with VM destruction plugged
- A set of small vgic fixes
There is a small chance that the compiler could generate separate loads
for the dist->propbaser which could be modified from another CPU. As we
want to make sure we atomically update the entire value, and don't race
with other updates, guarantee that the cmpxchg operation compares
against the original value.
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Christoffer Dall <cdall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
------------[ cut here ]------------
WARNING: CPU: 5 PID: 2288 at arch/x86/kvm/vmx.c:11124 nested_vmx_vmexit+0xd64/0xd70 [kvm_intel]
CPU: 5 PID: 2288 Comm: qemu-system-x86 Not tainted 4.13.0-rc2+ #7
RIP: 0010:nested_vmx_vmexit+0xd64/0xd70 [kvm_intel]
Call Trace:
vmx_check_nested_events+0x131/0x1f0 [kvm_intel]
? vmx_check_nested_events+0x131/0x1f0 [kvm_intel]
kvm_arch_vcpu_ioctl_run+0x5dd/0x1be0 [kvm]
? vmx_vcpu_load+0x1be/0x220 [kvm_intel]
? kvm_arch_vcpu_load+0x62/0x230 [kvm]
kvm_vcpu_ioctl+0x340/0x700 [kvm]
? kvm_vcpu_ioctl+0x340/0x700 [kvm]
? __fget+0xfc/0x210
do_vfs_ioctl+0xa4/0x6a0
? __fget+0x11d/0x210
SyS_ioctl+0x79/0x90
do_syscall_64+0x8f/0x750
? trace_hardirqs_on_thunk+0x1a/0x1c
entry_SYSCALL64_slow_path+0x25/0x25
This can be reproduced by booting L1 guest w/ 'noapic' grub parameter, which
means that tells the kernel to not make use of any IOAPICs that may be present
in the system.
Actually external_intr variable in nested_vmx_vmexit() is the req_int_win
variable passed from vcpu_enter_guest() which means that the L0's userspace
requests an irq window. I observed the scenario (!kvm_cpu_has_interrupt(vcpu) &&
L0's userspace reqeusts an irq window) is true, so there is no interrupt which
L1 requires to inject to L2, we should not attempt to emualte "Acknowledge
interrupt on exit" for the irq window requirement in this scenario.
This patch fixes it by not attempt to emulate "Acknowledge interrupt on exit"
if there is no L1 requirement to inject an interrupt to L2.
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com>
[Added code comment to make it obvious that the behavior is not correct.
We should do a userspace exit with open interrupt window instead of the
nested VM exit. This patch still improves the behavior, so it was
accepted as a (temporary) workaround.]
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
The commit 304419d8a7 ("mmc: core: Allocate per-request data using the
block layer core") refactored mechanism of queue handling caused
mmc_init_request() can be called just after mmc_cleanup_queue() caused null
pointer dereference.
Another commit bbdc74dc19 ("mmc: block: Prevent new req entering queue
after its cleanup") tried to fix the problem. However it actually miss one
corner case.
We could still reproduce the issue mentioned with these steps:
(1) insert a SD card and mount it
(2) hotplug it, so it will leave md->usage still be counted
(3) reboot the system which will sync data and umount the card
[Unable to handle kernel NULL pointer dereference at virtual address
00000000
[user pgtable: 4k pages, 48-bit VAs, pgd = ffff80007bab3000
[[0000000000000000] *pgd=000000007a828003, *pud=0000000078dce003,
*pmd=000000007aab6003, *pte=0000000000000000
[Internal error: Oops: 96000007 [#1] PREEMPT SMP
[Modules linked in:
[CPU: 3 PID: 3507 Comm: umount Tainted: G W
4.13.0-rc1-next-20170720-00012-g9d9bf45 #33
[Hardware name: Firefly-RK3399 Board (DT)
[task: ffff80007a1de200 task.stack: ffff80007a01c000
[PC is at mmc_init_request+0x14/0xc4
[LR is at alloc_request_size+0x4c/0x74
[pc : [<ffff0000087d7150>] lr : [<ffff000008378fe0>] pstate: 600001c5
[sp : ffff80007a01f8f0
....
[[<ffff0000087d7150>] mmc_init_request+0x14/0xc4
[[<ffff000008378fe0>] alloc_request_size+0x4c/0x74
[[<ffff00000817ac28>] mempool_create_node+0xb8/0x17c
[[<ffff00000837aadc>] blk_init_rl+0x9c/0x120
[[<ffff000008396580>] blkg_alloc+0x110/0x234
[[<ffff000008396ac8>] blkg_create+0x424/0x468
[[<ffff00000839877c>] blkg_lookup_create+0xd8/0x14c
[[<ffff0000083796bc>] generic_make_request_checks+0x368/0x3b0
[[<ffff00000837b050>] generic_make_request+0x1c/0x240
So mmc_blk_put wouldn't calling blk_cleanup_queue which actually the
QUEUE_FLAG_DYING and QUEUE_FLAG_BYPASS should stay. Block core expect
blk_queue_bypass_{start, end} internally to bypass/drain the queue before
actually dying the queue, so it didn't expose API to set the queue bypass.
I think we should set QUEUE_FLAG_BYPASS whenever queue is removed, although
the md->usage is still counted, as no dispatch queue could be found then.
Fixes: 304419d8a7 ("mmc: core: Allocate per-request data using the block layer core")
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
When the device is non removable, the card detect signal is often used
for another purpose i.e. muxed to another SoC peripheral or used as a
GPIO. It could lead to wrong behaviors depending the default value of
this signal if not muxed to the SDHCI controller.
Fixes: bb5f8ea4d5 ("mmc: sdhci-of-at91: introduce driver for the Atmel SDMMC")
Signed-off-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Stable fix:
- Fix EXCHANGE_ID corrupt verifier issue
Other fix:
- Fix double frees in nfs4_test_session_trunk()
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Merge tag 'nfs-for-4.13-4' of git://git.linux-nfs.org/projects/anna/linux-nfs
Pull NFS client fixes from Anna Schumaker:
"Two fixes from Trond this time, now that he's back from his vacation.
The first is a stable fix for the EXCHANGE_ID issue on the mailing
list, and the other fixes a double-free situation that he found at the
same time.
Stable fix:
- Fix EXCHANGE_ID corrupt verifier issue
Other fix:
- Fix double frees in nfs4_test_session_trunk()"
* tag 'nfs-for-4.13-4' of git://git.linux-nfs.org/projects/anna/linux-nfs:
NFSv4: Fix double frees in nfs4_test_session_trunk()
NFSv4: Fix EXCHANGE_ID corrupt verifier issue
This fixes a potential buffer overflow in isdn_net.c caused by an
unbounded strcpy.
[ ISDN seems to be effectively unmaintained, and the I4L driver in
particular is long deprecated, but in case somebody uses this..
- Linus ]
Signed-off-by: Jiten Thakkar <jitenmt@gmail.com>
Signed-off-by: Annie Cherkaev <annie.cherk@gmail.com>
Cc: Karsten Keil <isdn@linux-pingi.de>
Cc: Kees Cook <keescook@chromium.org>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Currently a bug in the sci_clk_get implementation causes it to always
return a clock belonging to the last device in the static list of clock
data. This is due to a bug in the init code that causes the array
used by sci_clk_get to only be populated with the clocks for the last
device, as each device overwrites the entire array with its own clocks.
Fix this by calculating the actual number of clocks for the SoC, and
allocating the whole array in one go. Also, we don't need the handle
to the init data array anymore after doing this, instead we can
just compare the dev_id / clk_id against the registered clocks and
use binary search for speed.
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Reported-by: Dave Gerlach <d-gerlach@ti.com>
Fixes: b745c0794e ("clk: keystone: Add sci-clk driver support")
Cc: Nishanth Menon <nm@ti.com>
Tested-by: Franklin Cooper <fcooper@ti.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
When new directory 'DIR1' is created in a directory 'DIR0' with SGID bit
set, DIR1 is expected to have SGID bit set (and owning group equal to
the owning group of 'DIR0'). However when 'DIR0' also has some default
ACLs that 'DIR1' inherits, setting these ACLs will result in SGID bit on
'DIR1' to get cleared if user is not member of the owning group.
Fix the problem by moving posix_acl_update_mode() out of ocfs2_set_acl()
into ocfs2_iop_set_acl(). That way the function will not be called when
inheriting ACLs which is what we want as it prevents SGID bit clearing
and the mode has been properly set by posix_acl_create() anyway. Also
posix_acl_chmod() that is calling ocfs2_set_acl() takes care of updating
mode itself.
Fixes: 073931017b ("posix_acl: Clear SGID bit when setting file permissions")
Link: http://lkml.kernel.org/r/20170801141252.19675-3-jack@suse.cz
Signed-off-by: Jan Kara <jack@suse.cz>
Cc: Mark Fasheh <mfasheh@versity.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Joseph Qi <jiangqi903@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Kernel panic when calling the IRQ-safe __get_user_pages_fast in NMI
handler.
The bug was introduced by commit 2947ba054a ("x86/mm/gup: Switch GUP
to the generic get_user_page_fast() implementation").
The original x86 __get_user_page_fast used plain get_page() or
page_ref_add(). However, the generic __get_user_page_fast uses
page_cache_get_speculative(), which has VM_BUG_ON(in_interrupt()).
There is no reason to prevent page_cache_get_speculative from using in
interrupt context. According to the author, putting a BUG_ON there is
just because the code is not verifying correctness of interrupt races.
I did some tests in interrupt context. There is no issue found.
Removing VM_BUG_ON(in_interrupt()) for page_cache_get_speculative().
Link: http://lkml.kernel.org/r/1501609146-59730-1-git-send-email-kan.liang@intel.com
Fixes: 2947ba054a ("x86/mm/gup: Switch GUP to the generic get_user_page_fast() implementation")
Signed-off-by: Kan Liang <kan.liang@intel.com>
Cc: Jens Axboe <axboe@fb.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Ying Huang <ying.huang@intel.com>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
There may still be threads waiting on event_wqh at the time the
userfault file descriptor is closed. Flush the events wait-queue to
prevent waiting threads from hanging.
Link: http://lkml.kernel.org/r/1501398127-30419-1-git-send-email-rppt@linux.vnet.ibm.com
Fixes: 9cd75c3cd4 ("userfaultfd: non-cooperative: add ability to report
non-PF events from uffd descriptor")
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Cc: Pavel Emelyanov <xemul@virtuozzo.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
When building with the randstruct gcc plugin, the layout of the IPC
structs will be randomized, which requires any sub-structure accesses to
use container_of(). The proc display handlers were missing the needed
container_of()s since the iterator is passing in the top-level struct
kern_ipc_perm.
This would lead to crashes when running the "lsipc" program after the
system had IPC registered (e.g. after starting up Gnome):
general protection fault: 0000 [#1] PREEMPT SMP
...
RIP: 0010:shm_add_rss_swap.isra.1+0x13/0xa0
...
Call Trace:
sysvipc_shm_proc_show+0x5e/0x150
sysvipc_proc_show+0x1a/0x30
seq_read+0x2e9/0x3f0
...
Link: http://lkml.kernel.org/r/20170730205950.GA55841@beast
Fixes: 3859a271a0 ("randstruct: Mark various structs for randomization")
Signed-off-by: Kees Cook <keescook@chromium.org>
Reported-by: Dominik Brodowski <linux@dominikbrodowski.net>
Acked-by: Davidlohr Bueso <dave@stgolabs.net>
Acked-by: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
In codepaths that use the begin/retry interface for reading
mems_allowed_seq with irqs disabled, there exists a race condition that
stalls the patch process after only modifying a subset of the
static_branch call sites.
This problem manifested itself as a deadlock in the slub allocator,
inside get_any_partial. The loop reads mems_allowed_seq value (via
read_mems_allowed_begin), performs the defrag operation, and then
verifies the consistency of mem_allowed via the read_mems_allowed_retry
and the cookie returned by xxx_begin.
The issue here is that both begin and retry first check if cpusets are
enabled via cpusets_enabled() static branch. This branch can be
rewritted dynamically (via cpuset_inc) if a new cpuset is created. The
x86 jump label code fully synchronizes across all CPUs for every entry
it rewrites. If it rewrites only one of the callsites (specifically the
one in read_mems_allowed_retry) and then waits for the
smp_call_function(do_sync_core) to complete while a CPU is inside the
begin/retry section with IRQs off and the mems_allowed value is changed,
we can hang.
This is because begin() will always return 0 (since it wasn't patched
yet) while retry() will test the 0 against the actual value of the seq
counter.
The fix is to use two different static keys: one for begin
(pre_enable_key) and one for retry (enable_key). In cpuset_inc(), we
first bump the pre_enable key to ensure that cpuset_mems_allowed_begin()
always return a valid seqcount if are enabling cpusets. Similarly, when
disabling cpusets via cpuset_dec(), we first ensure that callers of
cpuset_mems_allowed_retry() will start ignoring the seqcount value
before we let cpuset_mems_allowed_begin() return 0.
The relevant stack traces of the two stuck threads:
CPU: 1 PID: 1415 Comm: mkdir Tainted: G L 4.9.36-00104-g540c51286237 #4
Hardware name: Default string Default string/Hardware, BIOS 4.29.1-20170526215256 05/26/2017
task: ffff8817f9c28000 task.stack: ffffc9000ffa4000
RIP: smp_call_function_many+0x1f9/0x260
Call Trace:
smp_call_function+0x3b/0x70
on_each_cpu+0x2f/0x90
text_poke_bp+0x87/0xd0
arch_jump_label_transform+0x93/0x100
__jump_label_update+0x77/0x90
jump_label_update+0xaa/0xc0
static_key_slow_inc+0x9e/0xb0
cpuset_css_online+0x70/0x2e0
online_css+0x2c/0xa0
cgroup_apply_control_enable+0x27f/0x3d0
cgroup_mkdir+0x2b7/0x420
kernfs_iop_mkdir+0x5a/0x80
vfs_mkdir+0xf6/0x1a0
SyS_mkdir+0xb7/0xe0
entry_SYSCALL_64_fastpath+0x18/0xad
...
CPU: 2 PID: 1 Comm: init Tainted: G L 4.9.36-00104-g540c51286237 #4
Hardware name: Default string Default string/Hardware, BIOS 4.29.1-20170526215256 05/26/2017
task: ffff8818087c0000 task.stack: ffffc90000030000
RIP: int3+0x39/0x70
Call Trace:
<#DB> ? ___slab_alloc+0x28b/0x5a0
<EOE> ? copy_process.part.40+0xf7/0x1de0
__slab_alloc.isra.80+0x54/0x90
copy_process.part.40+0xf7/0x1de0
copy_process.part.40+0xf7/0x1de0
kmem_cache_alloc_node+0x8a/0x280
copy_process.part.40+0xf7/0x1de0
_do_fork+0xe7/0x6c0
_raw_spin_unlock_irq+0x2d/0x60
trace_hardirqs_on_caller+0x136/0x1d0
entry_SYSCALL_64_fastpath+0x5/0xad
do_syscall_64+0x27/0x350
SyS_clone+0x19/0x20
do_syscall_64+0x60/0x350
entry_SYSCALL64_slow_path+0x25/0x25
Link: http://lkml.kernel.org/r/20170731040113.14197-1-dmitriyz@waymo.com
Fixes: 46e700abc4 ("mm, page_alloc: remove unnecessary taking of a seqlock when cpusets are disabled")
Signed-off-by: Dima Zavin <dmitriyz@waymo.com>
Reported-by: Cliff Spradlin <cspradlin@waymo.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Christopher Lameter <cl@linux.com>
Cc: Li Zefan <lizefan@huawei.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
In the non-cooperative userfaultfd case, the process exit may race with
outstanding mcopy_atomic called by the uffd monitor. Returning -ENOSPC
instead of -EINVAL when mm is already gone will allow uffd monitor to
distinguish this case from other error conditions.
Unfortunately I overlooked userfaultfd_zeropage when updating
userfaultd_copy().
Link: http://lkml.kernel.org/r/1501136819-21857-1-git-send-email-rppt@linux.vnet.ibm.com
Fixes: 96333187ab ("userfaultfd_copy: return -ENOSPC in case mm has gone")
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Cc: Pavel Emelyanov <xemul@virtuozzo.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Andre Wild reported the following warning:
WARNING: CPU: 2 PID: 1205 at kernel/cpu.c:240 lockdep_assert_cpus_held+0x4c/0x60
Modules linked in:
CPU: 2 PID: 1205 Comm: bash Not tainted 4.13.0-rc2-00022-gfd2b2c57ec20 #10
Hardware name: IBM 2964 N96 702 (z/VM 6.4.0)
task: 00000000701d8100 task.stack: 0000000073594000
Krnl PSW : 0704f00180000000 0000000000145e24 (lockdep_assert_cpus_held+0x4c/0x60)
...
Call Trace:
lockdep_assert_cpus_held+0x42/0x60)
stop_machine_cpuslocked+0x62/0xf0
build_all_zonelists+0x92/0x150
numa_zonelist_order_handler+0x102/0x150
proc_sys_call_handler.isra.12+0xda/0x118
proc_sys_write+0x34/0x48
__vfs_write+0x3c/0x178
vfs_write+0xbc/0x1a0
SyS_write+0x66/0xc0
system_call+0xc4/0x2b0
locks held by bash/1205:
#0: (sb_writers#4){.+.+.+}, at: vfs_write+0xa6/0x1a0
#1: (zl_order_mutex){+.+...}, at: numa_zonelist_order_handler+0x44/0x150
#2: (zonelists_mutex){+.+...}, at: numa_zonelist_order_handler+0xf4/0x150
Last Breaking-Event-Address:
lockdep_assert_cpus_held+0x48/0x60
This can be easily triggered with e.g.
echo n > /proc/sys/vm/numa_zonelist_order
In commit 3f906ba236 ("mm/memory-hotplug: switch locking to a percpu
rwsem") memory hotplug locking was changed to fix a potential deadlock.
This also switched the stop_machine() invocation within
build_all_zonelists() to stop_machine_cpuslocked() which now expects
that online cpus are locked when being called.
This assumption is not true if build_all_zonelists() is being called
from numa_zonelist_order_handler().
In order to fix this simply add a mem_hotplug_begin()/mem_hotplug_done()
pair to numa_zonelist_order_handler().
Link: http://lkml.kernel.org/r/20170726111738.38768-1-heiko.carstens@de.ibm.com
Fixes: 3f906ba236 ("mm/memory-hotplug: switch locking to a percpu rwsem")
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Reported-by: Andre Wild <wild@linux.vnet.ibm.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
The kerneldoc comment for kthread_create() had an incorrect argument
name, leading to a warning in the docs build.
Correct it, and make one more small step toward a warning-free build.
Link: http://lkml.kernel.org/r/20170724135916.7f486c6f@lwn.net
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Cc: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
gcc-7 produces this warning:
mm/kasan/report.c: In function 'kasan_report':
mm/kasan/report.c:351:3: error: 'info.first_bad_addr' may be used uninitialized in this function [-Werror=maybe-uninitialized]
print_shadow_for_address(info->first_bad_addr);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mm/kasan/report.c:360:27: note: 'info.first_bad_addr' was declared here
The code seems fine as we only print info.first_bad_addr when there is a
shadow, and we always initialize it in that case, but this is relatively
hard for gcc to figure out after the latest rework.
Adding an intialization to the most likely value together with the other
struct members shuts up that warning.
Fixes: b235b9808664 ("kasan: unify report headers")
Link: https://patchwork.kernel.org/patch/9641417/
Link: http://lkml.kernel.org/r/20170725152739.4176967-1-arnd@arndb.de
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Suggested-by: Alexander Potapenko <glider@google.com>
Suggested-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Acked-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
When mremap is called with MREMAP_FIXED it unmaps memory at the
destination address without notifying userfaultfd monitor.
If the destination were registered with userfaultfd, the monitor has no
way to distinguish between the old and new ranges and to properly relate
the page faults that would occur in the destination region.
Fixes: 897ab3e0c4 ("userfaultfd: non-cooperative: add event for memory unmaps")
Link: http://lkml.kernel.org/r/1500276876-3350-1-git-send-email-rppt@linux.vnet.ibm.com
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Acked-by: Pavel Emelyanov <xemul@virtuozzo.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Nadav Amit identified a theoritical race between page reclaim and
mprotect due to TLB flushes being batched outside of the PTL being held.
He described the race as follows:
CPU0 CPU1
---- ----
user accesses memory using RW PTE
[PTE now cached in TLB]
try_to_unmap_one()
==> ptep_get_and_clear()
==> set_tlb_ubc_flush_pending()
mprotect(addr, PROT_READ)
==> change_pte_range()
==> [ PTE non-present - no flush ]
user writes using cached RW PTE
...
try_to_unmap_flush()
The same type of race exists for reads when protecting for PROT_NONE and
also exists for operations that can leave an old TLB entry behind such
as munmap, mremap and madvise.
For some operations like mprotect, it's not necessarily a data integrity
issue but it is a correctness issue as there is a window where an
mprotect that limits access still allows access. For munmap, it's
potentially a data integrity issue although the race is massive as an
munmap, mmap and return to userspace must all complete between the
window when reclaim drops the PTL and flushes the TLB. However, it's
theoritically possible so handle this issue by flushing the mm if
reclaim is potentially currently batching TLB flushes.
Other instances where a flush is required for a present pte should be ok
as either the page lock is held preventing parallel reclaim or a page
reference count is elevated preventing a parallel free leading to
corruption. In the case of page_mkclean there isn't an obvious path
that userspace could take advantage of without using the operations that
are guarded by this patch. Other users such as gup as a race with
reclaim looks just at PTEs. huge page variants should be ok as they
don't race with reclaim. mincore only looks at PTEs. userfault also
should be ok as if a parallel reclaim takes place, it will either fault
the page back in or read some of the data before the flush occurs
triggering a fault.
Note that a variant of this patch was acked by Andy Lutomirski but this
was for the x86 parts on top of his PCID work which didn't make the 4.13
merge window as expected. His ack is dropped from this version and
there will be a follow-on patch on top of PCID that will include his
ack.
[akpm@linux-foundation.org: tweak comments]
[akpm@linux-foundation.org: fix spello]
Link: http://lkml.kernel.org/r/20170717155523.emckq2esjro6hf3z@suse.de
Reported-by: Nadav Amit <nadav.amit@gmail.com>
Signed-off-by: Mel Gorman <mgorman@suse.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: <stable@vger.kernel.org> [v4.4+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
After commit 3d375d7859 ("mm: update callers to use HASH_ZERO flag"),
drop unused pidhash_size in pidhash_init().
Link: http://lkml.kernel.org/r/1500389267-49222-1-git-send-email-wangkefeng.wang@huawei.com
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Reviewed-by: Pavel Tatashin <Pasha.Tatashin@Oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Commit 9a291a7c94 ("mm/hugetlb: report -EHWPOISON not -EFAULT when
FOLL_HWPOISON is specified") causes __get_user_pages to ignore certain
errors from follow_hugetlb_page. After such error, __get_user_pages
subsequently calls faultin_page on the same VMA and start address that
follow_hugetlb_page failed on instead of returning the error immediately
as it should.
In follow_hugetlb_page, when hugetlb_fault returns a value covered under
VM_FAULT_ERROR, follow_hugetlb_page returns it without setting nr_pages
to 0 as __get_user_pages expects in this case, which causes the
following to happen in __get_user_pages: the "while (nr_pages)" check
succeeds, we skip the "if (!vma..." check because we got a VMA the last
time around, we find no page with follow_page_mask, and we call
faultin_page, which calls hugetlb_fault for the second time.
This issue also slightly changes how __get_user_pages works. Before, it
only returned error if it had made no progress (i = 0). But now,
follow_hugetlb_page can clobber "i" with an error code since its new
return path doesn't check for progress. So if "i" is nonzero before a
failing call to follow_hugetlb_page, that indication of progress is lost
and __get_user_pages can return error even if some pages were
successfully pinned.
To fix this, change follow_hugetlb_page so that it updates nr_pages,
allowing __get_user_pages to fail immediately and restoring the "error
only if no progress" behavior to __get_user_pages.
Tested that __get_user_pages returns when expected on error from
hugetlb_fault in follow_hugetlb_page.
Fixes: 9a291a7c94 ("mm/hugetlb: report -EHWPOISON not -EFAULT when FOLL_HWPOISON is specified")
Link: http://lkml.kernel.org/r/1500406795-58462-1-git-send-email-daniel.m.jordan@oracle.com
Signed-off-by: Daniel Jordan <daniel.m.jordan@oracle.com>
Acked-by: Punit Agrawal <punit.agrawal@arm.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Cc: James Morse <james.morse@arm.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: zhong jiang <zhongjiang@huawei.com>
Cc: <stable@vger.kernel.org> [4.12.x]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
