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Filename Latest commit message Latest commit date
Stafford Horne ff62a41403 openrisc: Fix oops caused when dumping stack 
[ Upstream commit 57b8e277c33620e115633cdf700a260b55095460 ]

When dumping a stack with 'cat /proc/#/stack' the kernel would oops.
For example:

    # cat /proc/690/stack
    Unable to handle kernel access
     at virtual address 0x7fc60f58

    Oops#: 0000
    CPU #: 0
       PC: c00097fc    SR: 0000807f    SP: d6f09b9c
    GPR00: 00000000 GPR01: d6f09b9c GPR02: d6f09bb8 GPR03: d6f09bc4
    GPR04: 7fc60f5c GPR05: c00099b4 GPR06: 00000000 GPR07: d6f09ba3
    GPR08: ffffff00 GPR09: c0009804 GPR10: d6f08000 GPR11: 00000000
    GPR12: ffffe000 GPR13: dbb86000 GPR14: 00000001 GPR15: dbb86250
    GPR16: 7fc60f63 GPR17: 00000f5c GPR18: d6f09bc4 GPR19: 00000000
    GPR20: c00099b4 GPR21: ffffffc0 GPR22: 00000000 GPR23: 00000000
    GPR24: 00000001 GPR25: 000002c6 GPR26: d78b6850 GPR27: 00000001
    GPR28: 00000000 GPR29: dbb86000 GPR30: ffffffff GPR31: dbb862fc
      RES: 00000000 oGPR11: ffffffff
    Process cat (pid: 702, stackpage=d79d6000)

    Stack:
    Call trace:
    [<598977f2>] save_stack_trace_tsk+0x40/0x74
    [<95063f0e>] stack_trace_save_tsk+0x44/0x58
    [<b557bfdd>] proc_pid_stack+0xd0/0x13c
    [<a2df8eda>] proc_single_show+0x6c/0xf0
    [<e5a737b7>] seq_read+0x1b4/0x688
    [<2d6c7480>] do_iter_read+0x208/0x248
    [<2182a2fb>] vfs_readv+0x64/0x90

This was caused by the stack trace code in save_stack_trace_tsk using
the wrong stack pointer.  It was using the user stack pointer instead of
the kernel stack pointer.  Fix this by using the right stack.

Also for good measure we add try_get_task_stack/put_task_stack to ensure
the task is not lost while we are walking it's stack.

Fixes: eecac38b04 ("openrisc: support framepointers and STACKTRACE_SUPPORT")
Signed-off-by: Stafford Horne <shorne@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-08-21 11:05:37 +02:00
..
alpha scsi: sr: remove references to BLK_DEV_SR_VENDOR, leave it enabled 2020-07-22 09:32:04 +02:00
arc ARC: elf: use right ELF_ARCH 2020-07-16 08:17:27 +02:00
arm ARM: 8992/1: Fix unwind_frame for clang-built kernels 2020-08-19 08:15:07 +02:00
arm64 arm64: dts: hisilicon: hikey: fixes to comply with adi, adv7533 DT binding 2020-08-19 08:14:51 +02:00
c6x kbuild: rename LDFLAGS to KBUILD_LDFLAGS 2018-08-24 08:22:08 +09:00
h8300 h8300: use cc-cross-prefix instead of hardcoding h8300-unknown-linux- 2019-04-05 22:32:55 +02:00
hexagon hexagon: define ioremap_uc 2020-05-10 10:30:11 +02:00
ia64 scsi: sr: remove references to BLK_DEV_SR_VENDOR, leave it enabled 2020-07-22 09:32:04 +02:00
m68k m68k: mac: Fix IOP status/control register writes 2020-08-19 08:14:49 +02:00
microblaze microblaze: Prevent the overflow of the start 2020-02-24 08:34:53 +01:00
mips MIPS: CPU#0 is not hotpluggable 2020-08-21 11:05:32 +02:00
nds32 nds32: Fix the items of hwcap_str ordering issue. 2019-12-13 08:51:35 +01:00
nios2 nios2: ksyms: Add missing symbol exports 2020-01-27 14:50:30 +01:00
openrisc openrisc: Fix oops caused when dumping stack 2020-08-21 11:05:37 +02:00
parisc parisc: Implement __smp_store_release and __smp_load_acquire barriers 2020-08-19 08:15:07 +02:00
powerpc pseries: Fix 64 bit logical memory block panic 2020-08-21 11:05:34 +02:00
riscv RISC-V: Upgrade smp_mb__after_spinlock() to iorw,iorw 2020-07-29 10:16:54 +02:00
s390 s390/mm: fix huge pte soft dirty copying 2020-07-16 08:17:28 +02:00
sh sh: Fix validation of system call number 2020-08-05 10:06:02 +02:00
sparc scsi: sr: remove references to BLK_DEV_SR_VENDOR, leave it enabled 2020-07-22 09:32:04 +02:00
um um: ubd: Prevent buffer overrun on command completion 2020-04-23 10:30:19 +02:00
unicore32 mm: convert return type of handle_mm_fault() caller to vm_fault_t 2018-08-17 16:20:28 -07:00
x86 genirq/affinity: Make affinity setting if activated opt-in 2020-08-21 11:05:28 +02:00
xtensa xtensa: fix xtensa_pmu_setup prototype 2020-08-21 11:05:31 +02:00
.gitignore
Kconfig jump_label: move 'asm goto' support test to Kconfig 2019-06-04 08:02:34 +02:00