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| author | Richard Weinberger <richard@nod.at> | 2013-09-23 17:38:02 +0200 |
|---|---|---|
| committer | Richard Weinberger <richard@nod.at> | 2013-11-17 11:27:30 +0100 |
| commit | f72c22e45e8f8fe78c7f793d983bee5bed63497e (patch) | |
| tree | 0e3051e2d357548d086a2ac00c4bfe201fe4e31d /arch/um/include | |
| parent | 9d1ee8ce92e16c6aa0a3fd91ee8ed9e403b3a2eb (diff) | |
| download | linux-f72c22e45e8f8fe78c7f793d983bee5bed63497e.tar.bz2 | |
um: Make stack trace reliable against kernel mode faults
As UML uses an alternative signal stack we cannot use
the current stack pointer for stack dumping if UML itself
dies by SIGSEGV. To bypass this issue we save regs taken
from mcontext in our segv handler into thread_struct and
use these regs to obtain the stack pointer in show_stack().
Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'arch/um/include')
| -rw-r--r-- | arch/um/include/asm/processor-generic.h | 1 | ||||
| -rw-r--r-- | arch/um/include/shared/os.h | 1 |
2 files changed, 2 insertions, 0 deletions
diff --git a/arch/um/include/asm/processor-generic.h b/arch/um/include/asm/processor-generic.h index c03cd5a02364..90469031297b 100644 --- a/arch/um/include/asm/processor-generic.h +++ b/arch/um/include/asm/processor-generic.h @@ -21,6 +21,7 @@ struct mm_struct; struct thread_struct { struct task_struct *saved_task; struct pt_regs regs; + struct pt_regs *segv_regs; int singlestep_syscall; void *fault_addr; jmp_buf *fault_catcher; diff --git a/arch/um/include/shared/os.h b/arch/um/include/shared/os.h index 021104d98cb3..75298d3358e7 100644 --- a/arch/um/include/shared/os.h +++ b/arch/um/include/shared/os.h @@ -227,6 +227,7 @@ extern void block_signals(void); extern void unblock_signals(void); extern int get_signals(void); extern int set_signals(int enable); +extern int os_is_signal_stack(void); /* util.c */ extern void stack_protections(unsigned long address); |