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Catalin Marinas 1417a6b8dc ARM: 8036/1: Enable IRQs before attempting to read user space in __und_usr 
The Undef abort handler in the kernel reads the undefined instruction
from user space. If the page table was modified from another CPU, the
user access could fail and do_page_fault() will be executed with
interrupts disabled. This can potentially deadlock on ARM11MPCore or on
Cortex-A15 with erratum 798181 workaround enabled (both implying IPI for
TLB maintenance with page table lock held).

This patch enables the IRQs in __und_usr before attempting to read the
instruction from user space.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Arun KS <getarunks@gmail.com>
Cc: Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ryan Mallon <rmallon@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2014-04-25 12:06:38 +01:00
..
boot
Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma
2014-04-10 08:55:08 -07:00
common
ARM: SoC: driver changes
2014-04-05 15:37:40 -07:00
configs
MMC highlights for 3.15:
2014-04-09 08:39:39 -07:00
crypto
CRYPTO: Fix more AES build errors
2014-01-05 13:59:56 +00:00
firmware
ARM: trusted_foundations: implement prepare_idle()
2014-02-18 13:46:46 -07:00
include
ARM: 8031/2: change fixmap mapping region to support 32 CPUs
2014-04-23 11:09:42 +01:00
kernel
ARM: 8036/1: Enable IRQs before attempting to read user space in __und_usr
2014-04-25 12:06:38 +01:00
kvm
CPU hotplug notifiers registration fixes for 3.15-rc1
2014-04-07 14:55:46 -07:00
lib
ARM: 7990/1: asm: rename logical shift macros push pull into lspush lspull
2014-02-25 11:33:57 +00:00
mach-at91
ARM: SoC: cleanups for 3.15
2014-04-05 13:51:19 -07:00
mach-bcm
ARM: SoC specific changes
2014-04-05 14:19:54 -07:00
mach-berlin
ARM: select HAVE_SMP for V7 multi-platform
2014-02-19 16:43:27 -06:00
mach-clps711x
ARM: SoC specific changes
2014-04-05 14:19:54 -07:00
mach-cns3xxx
ARM: SoC: cleanups for 3.15
2014-04-05 13:51:19 -07:00
mach-davinci
ARM: SoC: driver changes
2014-04-05 15:37:40 -07:00
mach-dove
ARM: SoC: driver changes
2014-04-05 15:37:40 -07:00
mach-ebsa110
ARM: SoC: cleanups for 3.15
2014-04-05 13:51:19 -07:00
mach-efm32
ARM: efm32: drop unused file <mach/timex.h>
2014-02-24 10:07:27 +01:00
mach-ep93xx
ARM: 8036/1: Enable IRQs before attempting to read user space in __und_usr
2014-04-25 12:06:38 +01:00
mach-exynos
ARM: SoC: late cleanups
2014-04-05 15:46:37 -07:00
mach-footbridge
ARM: SoC: cleanups for 3.15
2014-04-05 13:51:19 -07:00
mach-gemini
ARM: SoC: cleanups for 3.15
2014-04-05 13:51:19 -07:00
mach-highbank
ARM: select HAVE_SMP for V7 multi-platform
2014-02-19 16:43:27 -06:00
mach-hisi
ARM: SoC: cleanups for 3.15
2014-04-05 13:51:19 -07:00
mach-imx
ARM: SoC specific changes
2014-04-05 14:19:54 -07:00
mach-integrator
ARM: SoC: late cleanups
2014-04-05 15:46:37 -07:00
mach-iop13xx
ARM: drop <mach/timex.h> for !ARCH_MULTIPLATFORM, too
2013-12-20 17:17:16 +01:00
mach-iop32x
This cleanup series gets rid of <mach/timex.h> for platforms not using
2014-02-24 10:06:56 +01:00
mach-iop33x
ARM: drop <mach/timex.h> for !ARCH_MULTIPLATFORM, too
2013-12-20 17:17:16 +01:00
mach-ixp4xx
ARM: SoC: cleanups for 3.15
2014-04-05 13:51:19 -07:00
mach-keystone
ARM: SoC: device tree changes
2014-04-05 15:29:04 -07:00
mach-kirkwood
ARM: SoC: driver changes
2014-04-05 15:37:40 -07:00
mach-ks8695
ARM: SoC: cleanups for 3.15
2014-04-05 13:51:19 -07:00
mach-lpc32xx
ARM: SoC: cleanups for 3.15
2014-04-05 13:51:19 -07:00
mach-mmp
ARM: SoC: cleanups for 3.15
2014-04-05 13:51:19 -07:00
mach-moxart
ARM: SoC: cleanups for 3.15
2014-04-05 13:51:19 -07:00
mach-msm
ARM: SoC specific changes
2014-04-05 14:19:54 -07:00
mach-mv78xx0
ARM: SoC: driver changes
2014-04-05 15:37:40 -07:00
mach-mvebu
ARM: SoC specific changes
2014-04-05 14:19:54 -07:00
mach-mxs
ARM: SoC: device tree changes
2014-04-05 15:29:04 -07:00
mach-netx
ARM: SoC: cleanups for 3.15
2014-04-05 13:51:19 -07:00
mach-nomadik
ARM: centralize common multi-platform kconfig options
2014-02-19 16:38:18 -06:00
mach-nspire
ARM: SoC: cleanups for 3.15
2014-04-05 13:51:19 -07:00
mach-omap1
ARM: SoC: cleanups for 3.15
2014-04-05 13:51:19 -07:00
mach-omap2
fbdev changes for 3.15 (OMAP)
2014-04-07 10:47:51 -07:00
mach-orion5x
ARM: SoC: driver changes
2014-04-05 15:37:40 -07:00
mach-picoxcell
Kconfig: rename HAS_IOPORT to HAS_IOPORT_MAP
2014-04-07 16:36:11 -07:00
mach-prima2
Kconfig: rename HAS_IOPORT to HAS_IOPORT_MAP
2014-04-07 16:36:11 -07:00
mach-pxa
pwm: Changes for v3.15-rc1
2014-04-05 18:32:31 -07:00
mach-qcom
ARM: qcom: Add SMP support for KPSSv2
2014-02-11 15:00:40 -06:00
mach-realview
ARM: SoC: cleanups for 3.15
2014-04-05 13:51:19 -07:00
mach-rockchip
i.MX SoC changes for 3.15:
2014-03-09 12:03:18 -07:00
mach-rpc
ARM: SoC: cleanups for 3.15
2014-04-05 13:51:19 -07:00
mach-s3c24xx
Kconfig: rename HAS_IOPORT to HAS_IOPORT_MAP
2014-04-07 16:36:11 -07:00
mach-s3c64xx
ARM: SoC: late cleanups
2014-04-05 15:46:37 -07:00
mach-s5p64x0
ARM: SoC: late cleanups
2014-04-05 15:46:37 -07:00
mach-s5pc100
ARM: SoC: late cleanups
2014-04-05 15:46:37 -07:00
mach-s5pv210
ARM: SoC: late cleanups
2014-04-05 15:46:37 -07:00
mach-sa1100
ARM: SoC: cleanups for 3.15
2014-04-05 13:51:19 -07:00
mach-shmobile
Kconfig: rename HAS_IOPORT to HAS_IOPORT_MAP
2014-04-07 16:36:11 -07:00
mach-socfpga
The clock framework changes for 3.15 look similar to past pull requests.
2014-04-05 18:39:18 -07:00
mach-spear
ARM: SoC: cleanups for 3.15
2014-04-05 13:51:19 -07:00
mach-sti
Merge branch 'cleanup/kconfig' into next/drivers
2014-03-18 16:25:47 +01:00
mach-sunxi
ARM: SoC specific changes
2014-04-05 14:19:54 -07:00
mach-tegra
ARM: SoC specific changes
2014-04-05 14:19:54 -07:00
mach-u300
ARM: SoC: cleanups for 3.15
2014-04-05 13:51:19 -07:00
mach-ux500
ARM: SoC: device tree changes
2014-04-05 15:29:04 -07:00
mach-versatile
ARM: SoC: driver changes
2014-04-05 15:37:40 -07:00
mach-vexpress
Merge branch 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm
2014-04-11 11:56:40 -07:00
mach-vt8500
ARM: vt8500: enable V6K instead of plain V6
2014-02-19 16:47:16 -06:00
mach-w90x900
ARM: SoC: cleanups for 3.15
2014-04-05 13:51:19 -07:00
mach-zynq
ARM: SoC: late cleanups
2014-04-05 15:46:37 -07:00
mm
ARM: 8031/2: change fixmap mapping region to support 32 CPUs
2014-04-23 11:09:42 +01:00
net
net: filter: add jited flag to indicate jit compiled filters
2014-03-31 00:45:08 -04:00
nwfpe
…
oprofile
…
plat-iop
ARM: 8000/1: misc: remove deprecated IRQF_DISABLED
2014-03-12 10:32:38 +00:00
plat-omap
ARM: SoC: device tree changes
2014-04-05 15:29:04 -07:00
plat-orion
ARM: SoC: driver changes
2014-04-05 15:37:40 -07:00
plat-pxa
ARM: pxa: remove IRQF_DISABLED
2013-12-11 17:32:41 -08:00
plat-samsung
Kconfig: rename HAS_IOPORT to HAS_IOPORT_MAP
2014-04-07 16:36:11 -07:00
plat-versatile
ARM: SoC platform changes for 3.14
2014-01-23 18:40:49 -08:00
tools
…
vfp
ARM: 8036/1: Enable IRQs before attempting to read user space in __und_usr
2014-04-25 12:06:38 +01:00
xen
xen/grant-table: Refactor gnttab_[un]map_refs to avoid m2p_override
2014-03-18 14:40:19 +00:00
Kconfig
ARM: 8011/1: ARM hibernation / suspend-to-disk
2014-04-23 01:24:14 +01:00
Kconfig-nommu
…
Kconfig.debug
ARM: SoC: late cleanups
2014-04-05 15:46:37 -07:00
Makefile
ARM: SoC: cleanups for 3.15
2014-04-05 13:51:19 -07:00