Re: [DynInst_API:] Is the dynamic mode dyninst disable ptrace?

[Bill Williams <bill@xxxxxxxxxxx>]

On 02/17/2015 07:05 AM, Xi Chen wrote:
> Hi,
>    I recently try to debug the dynamic mode dyninst because I found the
> result is inconsistent with the static rewrite. I basically want to
> attach to mutatee process, and see how the instrumentation code be
> executed. However, when I do that in GDB, it tell me the ptrace
> operation is not permitted (I have teh yama/ptrace_scope as 0). I wonder
> if there are any way I can attach to the mutatee's address space and
> debug there?
Not without detaching your mutator first; ptrace only allows one 
debugger at a time to be attached.
You can, however, use breakpoint snippets and the stack walking 
interface in BPatch_process for programmatic debugging. You can also 
enable DYNINST_DEBUG_RELOC and/or DYNINST_DEBUG_SPRINGBOARD in your 
environment to see what, exactly, we're generating for 
relocated/instrumented code and for branches that lead to it, respectively.
>    Thank you for your time and have a nice day
> --
> Best Regards
> X.Chen
>
>
>
>
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--
--bw

Bill Williams
Paradyn Project
bill@xxxxxxxxxxx