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linux/arch/mips
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James Hogan 8542363633 MIPS: Avoid accidental raw backtrace 
Since commit 81a76d7119 ("MIPS: Avoid using unwind_stack() with
usermode") show_backtrace() invokes the raw backtracer when
cp0_status & ST0_KSU indicates user mode to fix issues on EVA kernels
where user and kernel address spaces overlap.

However this is used by show_stack() which creates its own pt_regs on
the stack and leaves cp0_status uninitialised in most of the code paths.
This results in the non deterministic use of the raw back tracer
depending on the previous stack content.

show_stack() deals exclusively with kernel mode stacks anyway, so
explicitly initialise regs.cp0_status to KSU_KERNEL (i.e. 0) to ensure
we get a useful backtrace.

Fixes: 81a76d7119 ("MIPS: Avoid using unwind_stack() with usermode")
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: <stable@vger.kernel.org> # 3.15+
Patchwork: https://patchwork.linux-mips.org/patch/16656/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2017-06-30 04:42:15 +02:00
..
alchemy MIPS: clockevent drivers: Set ->min_delta_ticks and ->max_delta_ticks 2017-04-14 13:11:16 -07:00
ar7 MIPS: Audit and remove any unnecessary uses of module.h 2017-02-14 09:00:25 +00:00
ath25
ath79 MIPS: Audit and remove any unnecessary uses of module.h 2017-02-14 09:00:25 +00:00
bcm47xx MIPS: BCM47XX: Fix button inversion for Asus WL-500W 2017-02-17 11:16:46 +00:00
bcm63xx MIPS: Audit and remove any unnecessary uses of module.h 2017-02-14 09:00:25 +00:00
bmips MIPS: BMIPS: Support APPENDED_DTB 2016-10-06 17:31:02 +02:00
boot MIPS: .its targets depend on vmlinux 2017-06-15 11:48:15 +02:00
cavium-octeon Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2017-05-12 09:56:30 -07:00
cobalt MIPS: Cobalt: Fix typo 2016-08-03 08:16:30 +02:00
configs Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2017-05-12 09:56:30 -07:00
dec format-security: move static strings to const 2017-05-08 17:15:14 -07:00
emma MIPS: Avoid old-style declaration 2017-01-25 02:51:11 +01:00
fw MIPS: Fix misspellings in comments. 2016-04-03 12:32:09 +02:00
generic MIPS: generic/kexec: add support for a DTB passed in a separate buffer 2017-01-03 16:34:46 +01:00
include MIPS: kprobes: flush_insn_slot should flush only if probe initialised 2017-06-08 15:42:05 +02:00
jazz MIPS: Audit and remove any unnecessary uses of module.h 2017-02-14 09:00:25 +00:00
jz4740 MIPS: clockevent drivers: Set ->min_delta_ticks and ->max_delta_ticks 2017-04-14 13:11:16 -07:00
kernel MIPS: Avoid accidental raw backtrace 2017-06-30 04:42:15 +02:00
kvm KVM: MIPS: Fix maybe-uninitialized build failure 2017-06-20 17:02:48 +02:00
lantiq MIPS: smp-mt: Use CPU interrupt controller IPI IRQ domain support 2017-04-12 23:13:13 +02:00
lasat MIPS: Audit and remove any unnecessary uses of module.h 2017-02-14 09:00:25 +00:00
lib mips: get rid of tail-zeroing in primitives 2017-04-06 02:08:08 -04:00
loongson32 MIPS: clockevent drivers: Set ->min_delta_ticks and ->max_delta_ticks 2017-04-14 13:11:16 -07:00
loongson64 MIPS: clockevent drivers: Set ->min_delta_ticks and ->max_delta_ticks 2017-04-14 13:11:16 -07:00
math-emu MIPS: math-emu: Handle zero accumulator case in MADDF and MSUBF separately 2017-06-28 02:54:30 +02:00
mm MIPS: Perform post-DMA cache flushes on systems with MAARs 2017-06-30 04:40:46 +02:00
mti-malta Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2017-05-12 09:56:30 -07:00
net MIPS: BPF: Fix multiple problems in JIT skb access helpers. 2017-04-10 11:56:05 +02:00
netlogic MIPS: Add missing include files 2017-03-08 10:38:06 +01:00
oprofile mips: sanitize __access_ok() 2017-04-06 02:08:06 -04:00
paravirt sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h> 2017-03-02 08:42:36 +01:00
pci Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2017-05-12 09:56:30 -07:00
pic32 MIPS: pic32mzda: Fix linker error for pic32_get_pbclk() 2017-02-17 11:14:29 +00:00
pistachio Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2016-08-06 09:13:11 -04:00
pmcs-msp71xx MIPS: Audit and remove any unnecessary uses of module.h 2017-02-14 09:00:25 +00:00
pnx833x MIPS: Squash lines for simple wrapper functions 2016-10-04 16:13:57 +02:00
power
ralink Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-05-01 16:15:18 -07:00
rb532 MIPS: Audit and remove any unnecessary uses of module.h 2017-02-14 09:00:25 +00:00
sgi-ip22 MIPS: Add missing include files 2017-03-08 10:38:06 +01:00
sgi-ip27 MIPS: clockevent drivers: Set ->min_delta_ticks and ->max_delta_ticks 2017-04-14 13:11:16 -07:00
sgi-ip32 MIPS: Add missing include files 2017-03-08 10:38:06 +01:00
sibyte MIPS: Sibyte: Export symbol periph_rev to sb1250-mac network driver. 2017-04-21 03:23:24 +02:00
sni char/genrtc: remove asm-generic/rtc.h from mips 2016-06-04 00:23:36 +02:00
txx9 MIPS: Audit and remove any unnecessary uses of module.h 2017-02-14 09:00:25 +00:00
vdso MIPS: VDSO: Explicitly use -fno-asynchronous-unwind-tables 2017-02-17 11:32:12 +00:00
vr41xx MIPS: Audit and remove any unnecessary uses of module.h 2017-02-14 09:00:25 +00:00
xilfpga MIPS: xilfpga: Use irqchip instead of the legacy way 2017-01-03 16:34:39 +01:00
Kbuild MIPS: Disable Werror when W= is set 2017-04-10 11:56:07 +02:00
Kbuild.platforms MIPS: generic: Convert SEAD-3 to a generic board 2016-10-06 18:04:20 +02:00
Kconfig Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2017-05-12 09:56:30 -07:00
Kconfig.debug MIPS: Sibyte: Fix Kconfig warning. 2017-04-21 03:34:01 +02:00
Makefile MIPS: generic: fix out-of-tree defconfig target builds 2017-04-11 13:17:31 +02:00
Makefile.postlink MIPS: Fix distclean with Makefile.postlink 2017-02-13 18:57:34 +00:00