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

..

include/mach

This cleanup series gets rid of <mach/timex.h> for platforms not using

2014-02-18 22:19:33 -08:00

adssphere.c

Initial irqchip init infrastructure and GIC and VIC clean-ups

2013-01-14 19:55:03 -08:00

clock.c

usb: ohci: remove ep93xx bus glue platform driver

2013-10-29 16:43:37 -07:00

core.c

ARM: SoC: cleanups for 3.15

2014-04-05 13:51:19 -07:00

crunch-bits.S

ARM: 8036/1: Enable IRQs before attempting to read user space in __und_usr

2014-04-25 12:06:38 +01:00

crunch.c

ARM: ep93xx: use machine specific hook for late init

2012-05-05 14:20:34 +08:00

dma.c

ARM: ep93xx: move platform_data definitions

2012-09-14 11:16:55 +02:00

edb93xx.c

Initial irqchip init infrastructure and GIC and VIC clean-ups

2013-01-14 19:55:03 -08:00

gesbc9312.c

Initial irqchip init infrastructure and GIC and VIC clean-ups

2013-01-14 19:55:03 -08:00

Kconfig

ARM: ep93xx: use soc bus

2013-11-25 14:24:28 -08:00

Makefile

ep93xx: Move crunch code to mach-ep93xx directory

2012-03-14 11:43:10 +11:00

Makefile.boot

ARM: 7022/1: allow to detect conflicting zreladdrs

2011-10-17 09:12:40 +01:00

micro9.c

Initial irqchip init infrastructure and GIC and VIC clean-ups

2013-01-14 19:55:03 -08:00

simone.c

Initial irqchip init infrastructure and GIC and VIC clean-ups

2013-01-14 19:55:03 -08:00

snappercl15.c

Initial irqchip init infrastructure and GIC and VIC clean-ups

2013-01-14 19:55:03 -08:00

soc.h

ep93xx: IDE driver platform support code

2012-06-04 14:40:46 +10:00

ts72xx.c

Initial irqchip init infrastructure and GIC and VIC clean-ups

2013-01-14 19:55:03 -08:00

ts72xx.h

ARM: ep93xx: Move ts72xx.h out of include/mach

2012-09-17 09:09:08 +10:00

vision_ep9307.c

MMC highlights for 3.12:

2013-09-10 13:33:09 -07:00