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6ed518328d
linux/arch/parisc/kernel
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John David Anglin 6ed518328d parisc: Ensure consistent state when switching to kernel stack at syscall entry 
We have one critical section in the syscall entry path in which we switch from
the userspace stack to kernel stack. In the event of an external interrupt, the
interrupt code distinguishes between those two states by analyzing the value of
sr7. If sr7 is zero, it uses the kernel stack. Therefore it's important, that
the value of sr7 is in sync with the currently enabled stack.

This patch now disables interrupts while executing the critical section.  This
prevents the interrupt handler to possibly see an inconsistent state which in
the worst case can lead to crashes.

Interestingly, in the syscall exit path interrupts were already disabled in the
critical section which switches back to the userspace stack.

Cc: <stable@vger.kernel.org>
Signed-off-by: John David Anglin <dave.anglin@bell.net>
Signed-off-by: Helge Deller <deller@gmx.de>
2016-11-02 23:05:30 +01:00
..
.gitignore
asm-offsets.c parisc: Unbreak handling exceptions from kernel modules 2016-04-08 22:14:14 +02:00
audit.c parisc: add kernel audit feature 2013-11-07 22:27:20 +01:00
binfmt_elf32.c parisc: fix redefinition of SET_PERSONALITY 2013-03-02 20:15:28 +01:00
cache.c parisc: use %pD 2016-08-07 23:38:49 -04:00
compat_audit.c parisc: add kernel audit feature 2013-11-07 22:27:20 +01:00
drivers.c parisc: use KERN_CONT when printing device inventory 2016-11-02 23:04:46 +01:00
entry.S parisc: Add cfi_startproc and cfi_endproc to assembly code 2016-10-05 22:54:40 +02:00
firmware.c parisc: Add break statements to pdc_pat_io_pci_cfg_read() 2016-08-02 16:44:33 +02:00
ftrace.c ftrace: Add return address pointer to ftrace_ret_stack 2016-08-24 12:15:14 +02:00
hardware.c parisc: add serial ports of C8000/1GHz machine to hardware database 2014-07-13 15:51:58 +02:00
head.S parisc: Fix ftrace function tracer 2016-04-14 17:47:19 +02:00
hpmc.S parisc: Add cfi_startproc and cfi_endproc to assembly code 2016-10-05 22:54:40 +02:00
inventory.c parisc: Use kmalloc_array() in add_system_map_addresses() 2016-09-20 18:02:56 +02:00
irq.c parisc: Filter out spurious interrupts in PA-RISC irq handler 2015-09-08 15:31:16 +02:00
Makefile parisc: Fix ftrace function tracer 2016-04-14 17:47:19 +02:00
module.c parisc: Handle R_PARISC_PCREL32 relocations in kernel modules 2016-04-08 22:10:35 +02:00
pa7300lc.c
pacache.S parisc: Add cfi_startproc and cfi_endproc to assembly code 2016-10-05 22:54:40 +02:00
parisc_ksyms.c parisc: Avoid function pointers for kernel exception routines 2016-04-08 22:13:45 +02:00
pci-dma.c dma-mapping: use unsigned long for dma_attrs 2016-08-04 08:50:07 -04:00
pci.c parisc: Initialize PCI bridge cache line and default latency 2016-01-12 22:03:21 +01:00
pdc_chassis.c parisc: single_open() leaks 2013-05-05 00:10:41 -04:00
pdc_cons.c parisc: don't use module_init for non-modular core pdc_cons code 2015-06-16 14:12:30 -04:00
perf_asm.S
perf_images.h
perf.c parisc64: don't use module_init for non-modular core perf code 2015-06-16 14:12:30 -04:00
process.c exit_thread: remove empty bodies 2016-05-20 17:58:30 -07:00
processor.c parisc: Fix automatic selection of cr16 clocksource 2016-08-20 13:33:51 +02:00
ptrace.c parisc/ptrace: run seccomp after ptrace 2016-06-14 10:54:44 -07:00
real2.S parisc: Add cfi_startproc and cfi_endproc to assembly code 2016-10-05 22:54:40 +02:00
setup.c parisc: Increase KERNEL_INITIAL_SIZE for 32-bit SMP kernels 2016-10-07 18:23:43 +02:00
signal32.c parisc: Fix SIGSYS signals in compat case 2016-03-31 12:28:37 +02:00
signal32.h constify copy_siginfo_to_user{,32}() 2013-11-09 00:16:29 -05:00
signal.c parisc: Fix syscall restarts 2015-12-21 10:16:18 +01:00
smp.c parisc: Check return value of smp_boot_one_cpu() 2016-09-20 18:02:36 +02:00
stacktrace.c parisc: add LATENCYTOP_SUPPORT and CONFIG_STACKTRACE_SUPPORT 2009-03-31 02:51:34 +00:00
sys_parisc32.c parisc: drop unused defines and header includes 2014-07-13 15:56:12 +02:00
sys_parisc.c parisc: Drop alloc_hugepages and free_hugepages syscalls 2016-03-23 15:42:18 +01:00
syscall_table.S parisc: Wire up preadv2 and pwritev2 syscalls 2016-03-23 16:22:42 +01:00
syscall.S parisc: Ensure consistent state when switching to kernel stack at syscall entry 2016-11-02 23:05:30 +01:00
time.c parisc: Fix self-detected CPU stall warnings on Mako machines 2016-09-25 21:27:01 +02:00
topology.c parisc: Replace NR_CPUS in parisc code 2009-01-05 19:09:02 +00:00
traps.c parisc: Show trap name in kernel crash 2016-10-11 20:52:47 +02:00
unaligned.c parisc: Move die_if_kernel() prototype into traps.h header 2016-06-05 08:49:01 +02:00
unwind.c parisc: Fix backtrace on PA-RISC 2016-06-04 22:05:07 +02:00
vmlinux.lds.S parisc: Move exception table into read-only section 2016-10-09 13:29:07 +02:00