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linux/arch/arm/kernel
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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
..
.gitignore
arch_timer.c arch_timer: Move to generic sched_clock framework 2013-10-09 16:54:10 -07:00
armksyms.c ARM: Better virt_to_page() handling 2014-04-03 22:46:34 +01:00
arthur.c
asm-offsets.c ARM: KVM: introduce per-vcpu HYP Configuration Register 2014-03-03 01:15:23 +00:00
atags.h
atags_compat.c
atags_parse.c
atags_proc.c
bios32.c Merge branch 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm 2014-04-05 13:20:43 -07:00
calls.S sched: Add new scheduler syscalls to support an extended scheduling parameters ABI 2014-01-13 13:41:04 +01:00
cpuidle.c
crash_dump.c ARM: 8012/1: kdump: Avoid overflow when converting pfn to physaddr 2014-04-07 12:10:00 +01:00
debug.S
devtree.c ARM: Introduce CPU_METHOD_OF_DECLARE() for cpu hotplug/smp 2014-02-11 15:00:37 -06:00
dma-isa.c
dma.c
early_printk.c
elf.c
entry-armv.S ARM: 8036/1: Enable IRQs before attempting to read user space in __und_usr 2014-04-25 12:06:38 +01:00
entry-common.S ARM: asm: Add ARM_BE8() assembly helper 2013-10-19 20:46:33 +01:00
entry-header.S ARM: 8017/1: Move asm macro get_thread_info to asm/assembler.h 2014-04-09 13:08:07 +01:00
entry-v7m.S ARM: 7890/1: v7-M: drop using mach/entry-macro.S 2013-12-29 12:32:32 +00:00
etm.c ARM: 7905/1: etm: Remove unnecessary amba_set_drvdata() 2013-12-29 12:32:34 +00:00
fiq.c ARM: 7819/1: fiq: Cast the first argument of flush_icache_range() 2013-08-20 00:11:50 +01:00
fiqasm.S
ftrace.c ARM: 8022/1: ftrace: work with CONFIG_DEBUG_SET_MODULE_RONX 2014-04-23 01:24:31 +01:00
head-common.S ARM: 7980/1: kernel: improve error message when LPAE config doesn't match CPU 2014-02-21 11:56:32 +00:00
head-nommu.S ARM: fix asm/memory.h build error 2013-12-13 20:25:30 +00:00
head.S Merge branches 'amba', 'fixes', 'misc', 'mmci', 'unstable/omap-dma' and 'unstable/sa11x0' into for-next 2014-04-04 00:33:32 +01:00
hibernate.c ARM: 8011/1: ARM hibernation / suspend-to-disk 2014-04-23 01:24:14 +01:00
hw_breakpoint.c CPU hotplug notifiers registration fixes for 3.15-rc1 2014-04-07 14:55:46 -07:00
hyp-stub.S
insn.c
insn.h
io.c ARM: 7930/1: Introduce atomic MMIO modify 2014-01-28 14:06:25 +00:00
irq.c
isa.c
iwmmxt.S ARM: 8036/1: Enable IRQs before attempting to read user space in __und_usr 2014-04-25 12:06:38 +01:00
jump_label.c
kgdb.c
kprobes-arm.c ARM: Make arch_specific_insn a define for new arch_probes_insn structure 2014-03-18 16:39:40 -04:00
kprobes-common.c ARM: probes: fix instruction fetch order with <asm/opcodes.h> 2014-04-01 16:45:19 +03:00
kprobes-test-arm.c ARM: kprobes-test: use <asm/opcodes.h> for ARM instruction building 2014-04-01 16:48:24 +03:00
kprobes-test-thumb.c ARM: kprobes-test: use <asm/opcodes.h> for Thumb instruction building 2014-04-01 16:48:26 +03:00
kprobes-test.c ARM: kprobes-test: Workaround GAS .align bug 2014-04-01 16:48:27 +03:00
kprobes-test.h ARM: kprobes-test: Workaround GAS .align bug 2014-04-01 16:48:27 +03:00
kprobes-thumb.c ARM: probes: fix instruction fetch order with <asm/opcodes.h> 2014-04-01 16:45:19 +03:00
kprobes.c ARM: probes: fix instruction fetch order with <asm/opcodes.h> 2014-04-01 16:45:19 +03:00
kprobes.h ARM: Make arch_specific_insn a define for new arch_probes_insn structure 2014-03-18 16:39:40 -04:00
machine_kexec.c ARM: 7897/1: kexec: Use the right ISA for relocate_new_kernel 2013-11-30 22:21:02 +00:00
Makefile ARM: 8011/1: ARM hibernation / suspend-to-disk 2014-04-23 01:24:14 +01:00
module.c Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm 2013-11-14 08:51:29 +09:00
opcodes.c
patch.c
patch.h
perf_event.c ARM: perf: hook up perf_sample_event_took around pmu irq handling 2014-02-21 11:11:21 +00:00
perf_event_cpu.c ARM: perf: add support for the Cortex-A12 PMU 2014-02-21 11:11:23 +00:00
perf_event_v6.c
perf_event_v7.c ARM: perf: add support for the Cortex-A12 PMU 2014-02-21 11:11:23 +00:00
perf_event_xscale.c
perf_regs.c ARM: perf: add support for perf registers API 2013-09-30 16:41:50 +01:00
pj4-cp0.c ARM: 8016/1: Check cpu id in pj4_cp0_init. 2014-04-08 17:55:28 +01:00
probes-arm.c ARM: Make arch_specific_insn a define for new arch_probes_insn structure 2014-03-18 16:39:40 -04:00
probes-arm.h ARM: Make arch_specific_insn a define for new arch_probes_insn structure 2014-03-18 16:39:40 -04:00
probes-thumb.c ARM: Make arch_specific_insn a define for new arch_probes_insn structure 2014-03-18 16:39:40 -04:00
probes-thumb.h ARM: Make arch_specific_insn a define for new arch_probes_insn structure 2014-03-18 16:39:40 -04:00
probes.c ARM: probes: fix instruction fetch order with <asm/opcodes.h> 2014-04-01 16:45:19 +03:00
probes.h ARM: Make arch_specific_insn a define for new arch_probes_insn structure 2014-03-18 16:39:40 -04:00
process.c Merge branch 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm 2014-04-11 11:56:40 -07:00
psci.c
psci_smp.c ARM: PSCI: remove unnecessary include of arm-gic.h 2013-10-01 16:34:10 -05:00
ptrace.c
relocate_kernel.S ARM: 7897/1: kexec: Use the right ISA for relocate_new_kernel 2013-11-30 22:21:02 +00:00
return_address.c
setup.c Merge branches 'amba', 'fixes', 'misc', 'mmci', 'unstable/omap-dma' and 'unstable/sa11x0' into for-next 2014-04-04 00:33:32 +01:00
signal.c ARM: add uprobes support 2014-03-18 16:39:40 -04:00
sigreturn_codes.S ARM: 7895/1: signal: fix armv7-m build issue in sigreturn_codes.S 2013-11-30 22:21:00 +00:00
sleep.S Merge branch 'baserock/bjdooks/312-rc4/be/core-v3' of git://git.baserock.org/delta/linux into devel-stable 2013-10-30 22:20:26 +00:00
smp.c cpufreq: remove unused notifier: CPUFREQ_{SUSPENDCHANGE|RESUMECHANGE} 2014-03-19 14:10:24 +01:00
smp_scu.c ARM: smp_scu: data endian fixes 2013-10-19 20:46:33 +01:00
smp_tlb.c ARM: 7855/1: Add check for Cortex-A15 errata 798181 ECO 2013-10-29 11:06:13 +00:00
smp_twd.c cpufreq: remove unused notifier: CPUFREQ_{SUSPENDCHANGE|RESUMECHANGE} 2014-03-19 14:10:24 +01:00
stacktrace.c ARM: 7913/1: fix framepointer check in unwind_frame 2013-12-09 23:24:33 +00:00
suspend.c
swp_emulate.c
sys_arm.c
sys_oabi-compat.c locks: add new fcntl cmd values for handling file private locks 2014-03-31 08:24:43 -04:00
tcm.c ARM: add permission annotations to MT_MEMORY* mapping types 2013-12-11 09:53:14 +00:00
thumbee.c
time.c ARM: call of_clk_init from default time_init handler 2013-09-29 21:09:15 +02:00
topology.c ARM: 8008/1: topology: Coding style fixes 2014-04-14 23:27:19 +01:00
traps.c Dump the registers on undefined instruction userspace faults 2014-04-11 14:48:39 +01:00
unwind.c ARM: 7987/1: ARM : unwinder : Prevent data abort due to stack overflow 2014-02-25 11:48:24 +00:00
uprobes-arm.c ARM: add uprobes support 2014-03-18 16:39:40 -04:00
uprobes.c ARM: add uprobes support 2014-03-18 16:39:40 -04:00
uprobes.h ARM: add uprobes support 2014-03-18 16:39:40 -04:00
v7m.c ARM: 7828/1: ARMv7-M: implement restart routine common to all v7-M machines 2013-09-02 13:49:29 +01:00
vmlinux.lds.S ARM: use linker magic for vectors and vector stubs 2013-07-31 21:34:24 +01:00
xscale-cp0.c