Messages in this thread Patch in this message | | | Date | Sun, 10 Apr 2016 23:29:49 -0400 | From | Jessica Yu <> | Subject | Re: x86/stacktrace: add function for detecting reliable stack traces |
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+++ Josh Poimboeuf [25/03/16 14:34 -0500]: >For live patching and possibly other use cases, a stack trace is only >useful if you can be assured that it's completely reliable. Add a new >save_stack_trace_tsk_reliable() function to achieve that. > >Scenarios which indicate that a stack strace may be unreliable:
s/strace/trace
> >- interrupt stacks >- preemption >- corrupted stack data >- newly forked tasks >- running tasks >- the user didn't provide a large enough entries array > >Also add a config option so arch-independent code can determine at build >time whether the function is implemented. > >Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> >--- > arch/Kconfig | 6 ++++++ > arch/x86/Kconfig | 1 + > arch/x86/kernel/dumpstack.c | 36 ++++++++++++++++++++++++++++++++++++ > arch/x86/kernel/stacktrace.c | 32 ++++++++++++++++++++++++++++++++ > include/linux/stacktrace.h | 20 ++++++++++++++++---- > kernel/stacktrace.c | 4 ++-- > lib/Kconfig.debug | 6 ++++++ > 7 files changed, 99 insertions(+), 6 deletions(-) > >diff --git a/arch/Kconfig b/arch/Kconfig >index 81869a5..68b95f1 100644 >--- a/arch/Kconfig >+++ b/arch/Kconfig >@@ -589,6 +589,12 @@ config HAVE_STACK_VALIDATION > Architecture supports the 'objtool check' host tool command, which > performs compile-time stack metadata validation. > >+config HAVE_RELIABLE_STACKTRACE >+ bool >+ help >+ Architecure has a save_stack_trace_tsk_reliable() function which only
s/Architecure/Architecture
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