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Tetsuo Handa caa6926d94 /dev/mem: Bail out upon SIGKILL. 
commit 8619e5bdee upstream.

syzbot found that a thread can stall for minutes inside read_mem() or
write_mem() after that thread was killed by SIGKILL [1]. Reading from
iomem areas of /dev/mem can be slow, depending on the hardware.
While reading 2GB at one read() is legal, delaying termination of killed
thread for minutes is bad. Thus, allow reading/writing /dev/mem and
/dev/kmem to be preemptible and killable.

  [ 1335.912419][T20577] read_mem: sz=4096 count=2134565632
  [ 1335.943194][T20577] read_mem: sz=4096 count=2134561536
  [ 1335.978280][T20577] read_mem: sz=4096 count=2134557440
  [ 1336.011147][T20577] read_mem: sz=4096 count=2134553344
  [ 1336.041897][T20577] read_mem: sz=4096 count=2134549248

Theoretically, reading/writing /dev/mem and /dev/kmem can become
"interruptible". But this patch chose "killable". Future patch will make
them "interruptible" so that we can revert to "killable" if some program
regressed.

[1] https://syzkaller.appspot.com/bug?id=a0e3436829698d5824231251fad9d8e998f94f5e

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: stable <stable@vger.kernel.org>
Reported-by: syzbot <syzbot+8ab2d0f39fb79fe6ca40@syzkaller.appspotmail.com>
Link: https://lore.kernel.org/r/1566825205-10703-1-git-send-email-penguin-kernel@I-love.SAKURA.ne.jp
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-10-05 13:10:11 +02:00
..
accessibility
acpi ACPI / PCI: fix acpi_pci_irq_enable() memory leak 2019-10-05 13:09:53 +02:00
amba
android binder: fix possible UAF when freeing buffer 2019-08-04 09:30:53 +02:00
ata libata/ahci: Drop PCS quirk for Denverton and beyond 2019-10-05 13:09:52 +02:00
atm Kconfig: Fix the reference to the IDT77105 Phy driver in the description of ATM_NICSTAR_USE_IDT77105 2019-09-21 07:16:57 +02:00
auxdisplay auxdisplay: panel: need to delete scan_timer when misc_register fails in panel_attach 2019-09-06 10:21:56 +02:00
base base: soc: Export soc_device_register/unregister APIs 2019-10-05 13:09:37 +02:00
bcma
block nbd: add missing config put 2019-10-05 13:09:45 +02:00
bluetooth Bluetooth: btrtl: Additional Realtek 8822CE Bluetooth devices 2019-10-01 08:26:12 +02:00
bus bus: ti-sysc: Simplify cleanup upon failures in sysc_probe() 2019-09-21 07:16:51 +02:00
cdrom cdrom: Fix race condition in cdrom_sysctl_register 2019-04-05 22:33:10 +02:00
char /dev/mem: Bail out upon SIGKILL. 2019-10-05 13:10:11 +02:00
clk clk: rockchip: Don't yell about bad mmc phases when getting 2019-09-19 09:09:36 +02:00
clocksource clocksource/drivers/exynos_mct: Increase priority over ARM arch timer 2019-07-26 09:14:12 +02:00
connector
cpufreq cpufreq/pasemi: fix use-after-free in pas_cpufreq_cpu_init() 2019-08-16 10:12:46 +02:00
cpuidle
crypto crypto: talitos - fix missing break in switch statement 2019-10-01 08:26:02 +02:00
dax mm/huge_memory: fix vmf_insert_pfn_{pmd, pud}() crash, handle unaligned addresses 2019-05-22 07:37:40 +02:00
dca
devfreq PM / devfreq: passive: fix compiler warning 2019-10-05 13:09:59 +02:00
dio
dma dmaengine: ti: edma: Do not reset reserved paRAM slots 2019-10-05 13:09:54 +02:00
dma-buf dma-buf: Discard old fence_excl on retrying get_fences_rcu for realloc 2019-07-28 08:29:28 +02:00
edac EDAC/amd64: Decode syndrome before translating address 2019-10-05 13:09:48 +02:00
eisa
extcon extcon: arizona: Disable mic detect if running when driver is removed 2019-05-31 06:46:23 -07:00
firewire
firmware firmware: arm_scmi: Check if platform has released shmem before using 2019-10-05 13:09:39 +02:00
fmc
fpga fpga: altera-ps-spi: Fix getting of optional confd gpio 2019-09-21 07:16:53 +02:00
fsi fsi: scom: Don't abort operations for minor errors 2019-09-06 10:22:19 +02:00
gnss
gpio gpio: fix line flag validation in lineevent_create 2019-09-19 09:09:37 +02:00
gpu drm/amd/powerplay/smu7: enforce minimal VBITimeout (v2) 2019-10-05 13:09:58 +02:00
hid HID: Add quirk for HP X500 PIXART OEM mouse 2019-10-01 08:26:02 +02:00
hsi
hv Drivers: hv: kvp: Fix the recent regression caused by incorrect clean-up 2019-09-16 08:21:54 +02:00
hwmon hwmon: (acpi_power_meter) Change log level for 'unsafe software power cap' 2019-10-05 13:09:54 +02:00
hwspinlock
hwtracing intel_th: pci: Add Tiger Lake support 2019-09-06 10:22:18 +02:00
i2c i2c: designware: Synchronize IRQs when unregistering slave client 2019-09-21 07:17:06 +02:00
ide
idle x86/cpu: Sanitize FAM6_ATOM naming 2019-05-14 19:17:53 +02:00
iio iio: adc: stm32-dfsdm: fix data type 2019-09-19 09:09:40 +02:00
infiniband IB/hfi1: Define variables as unsigned long to fix KASAN warning 2019-10-05 13:10:02 +02:00
input Input: elan_i2c - remove Lenovo Legion Y7000 PnpID 2019-09-21 07:16:41 +02:00
iommu iommu/amd: Override wrong IVRS IOAPIC on Raven Ridge systems 2019-10-05 13:09:59 +02:00
ipack
irqchip irqchip/gic-v3-its: Fix LPI release for Multi-MSI devices 2019-10-01 08:26:08 +02:00
isdn mISDN: enforce CAP_NET_RAW for raw sockets 2019-10-05 13:09:31 +02:00
leds led: triggers: Fix a memory leak bug 2019-10-05 13:09:45 +02:00
lightnvm lightnvm: pblk: fix freeing of merged pages 2019-07-26 09:14:09 +02:00
macintosh
mailbox mailbox: handle failed named mailbox channel request 2019-07-31 07:27:07 +02:00
mcb
md md: only call set_in_sync() when it is expected to succeed. 2019-10-05 13:10:10 +02:00
media media: don't drop front-end reference count for ->detach 2019-10-05 13:10:05 +02:00
memory memory: tegra: Fix integer overflow on tick value calculation 2019-05-25 18:23:32 +02:00
memstick memstick: Fix error cleanup path of memstick_init 2019-07-31 07:26:59 +02:00
message
mfd mfd: Kconfig: Fix I2C_DESIGNWARE_PLATFORM dependencies 2019-09-16 08:22:04 +02:00
misc VMCI: Release resource if the work is already queued 2019-09-06 10:22:20 +02:00
mmc mmc: dw_mmc: Re-store SDIO IRQs mask at system resume 2019-10-05 13:09:57 +02:00
mtd mtd: cfi_cmdset_0002: Use chip_good() to retry in do_write_oneword() 2019-10-01 08:26:02 +02:00
mux
net i40e: check __I40E_VF_DISABLE bit in i40e_sync_filters_subtask 2019-10-05 13:10:08 +02:00
nfc st_nci_hci_connectivity_event_received: null check the allocation 2019-08-29 08:28:31 +02:00
ntb
nubus
nvdimm libnvdimm/bus: Fix wait_nvdimm_bus_probe_idle() ABBA deadlock 2019-08-09 17:52:28 +02:00
nvme nvme-multipath: fix ana log nsid lookup when nsid is not found 2019-10-05 13:09:52 +02:00
nvmem nvmem: Use the same permissions for eeprom as for nvmem 2019-09-19 09:09:41 +02:00
of of: overlay: set node fields from properties when add new overlay node 2019-06-09 09:17:24 +02:00
opp
oprofile
parisc parisc: Disable HP HSC-PCI Cards to prevent kernel crash 2019-10-05 13:10:04 +02:00
parport parport: Fix mem leak in parport_register_dev_model 2019-06-25 11:35:55 +08:00
pci PCI: hv: Avoid use of hv_pci_dev->pci_slot after freeing it 2019-10-01 08:26:09 +02:00
pcmcia
perf drivers/perf: arm_pmu: Fix failure path in PM notifier 2019-08-06 19:06:55 +02:00
phy phy: renesas: rcar-gen3-usb2: Disable clearing VBUS in over-current 2019-09-21 07:16:42 +02:00
pinctrl pinctrl: sprd: Use define directive for sprd_pinconf_params values 2019-10-01 08:26:07 +02:00
platform platform/x86: intel_pmc_core: Do not ioremap RAM 2019-10-05 13:09:55 +02:00
pnp
power power: supply: sysfs: ratelimit property read error message 2019-10-01 08:26:07 +02:00
powercap x86/cpu: Sanitize FAM6_ATOM naming 2019-05-14 19:17:53 +02:00
pps drivers/pps/pps.c: clear offset flags in PPS_SETPARAMS ioctl 2019-08-04 09:30:56 +02:00
ps3
ptp
pwm Revert "pwm: Set class for exported channels in sysfs" 2019-08-25 10:47:46 +02:00
rapidio drivers/rapidio/devices/rio_mport_cdev.c: NUL terminate some strings 2019-08-06 19:06:52 +02:00
ras RAS/CEC: Fix pfn insertion 2019-07-26 09:14:05 +02:00
regulator regulator: Defer init completion for a while after late_initcall 2019-10-05 13:10:07 +02:00
remoteproc remoteproc: qcom: q6v5-mss: add SCM probe dependency 2019-09-16 08:21:48 +02:00
reset reset: meson-audio-arb: Fix missing .owner setting of reset_controller_dev 2019-05-08 07:21:47 +02:00
rpmsg
rtc rtc: pcf8523: don't return invalid date when battery is low 2019-06-19 08:18:07 +02:00
s390 virtio/s390: fix race on airq_areas[] 2019-09-16 08:22:23 +02:00
sbus
scsi scsi: implement .cleanup_rq callback 2019-10-05 13:10:03 +02:00
sfi
sh
siox
slimbus slimbus: fix a potential NULL pointer dereference in of_qcom_slim_ngd_register 2019-05-31 06:46:14 -07:00
sn
soc soc: bcm: brcmstb: biuctrl: Register writes require a barrier 2019-07-14 08:11:03 +02:00
soundwire soundwire: cadence_master: fix definitions for INTSTAT0/1 2019-09-06 10:21:56 +02:00
spi spi: spi-gpio: fix SPI_CS_HIGH capability 2019-09-16 08:22:07 +02:00
spmi
ssb ssb: Fix possible NULL pointer dereference in ssb_host_pcmcia_exit 2019-05-31 06:46:04 -07:00
staging media: imx: mipi csi-2: Don't fail if initial state times-out 2019-10-05 13:09:43 +02:00
target scsi: target/iblock: Fix overrun in WRITE SAME emulation 2019-09-16 08:22:17 +02:00
tc
tee
thermal drivers: thermal: tsens: Don't print error message on -EPROBE_DEFER 2019-06-15 11:54:02 +02:00
thunderbolt thunderbolt: property: Fix a NULL pointer dereference 2019-05-31 06:46:31 -07:00
tty tty/serial: atmel: reschedule TX after RX was started 2019-09-21 07:16:45 +02:00
uio
usb usb: host: xhci-tegra: Set DMA mask correctly 2019-09-21 07:17:04 +02:00
uwb
vfio vfio: Fix WARNING "do not call blocking ops when !TASK_RUNNING" 2019-06-15 11:54:07 +02:00
vhost vhost: make sure log_num < in_num 2019-09-16 08:22:25 +02:00
video efifb: BGRT: Improve efifb_bgrt_sanity_check 2019-10-05 13:10:07 +02:00
virt drivers/virt/fsl_hypervisor.c: prevent integer overflow in ioctl 2019-05-16 19:41:31 +02:00
virtio virtio_pci: fix a NULL pointer reference in vp_del_vqs 2019-05-10 17:54:08 +02:00
visorbus
vlynq
vme
w1 w1: fix the resume command API 2019-05-31 06:46:14 -07:00
watchdog watchdog: bcm2835_wdt: Fix module autoload 2019-09-06 10:22:02 +02:00
xen xen/pciback: remove set but not used variable 'old_state' 2019-08-25 10:47:52 +02:00
zorro
Kconfig
Makefile