Re: [DynInst_API:] PIE segfault

[Mohamed Elsabagh <melsabag@xxxxxxx>]

Hi John,Â

I pulled the latest commit from git.dyninst.org, which resulted in the error in my previous email.Â

Now using a clone from the github path your provided, I am getting the following message on stderr:Â

decodeOneOperand() called with unknown addressing method 18

And even though the output binary is created, it does not execute (exec format error). Â

Again, I am testing with /usr/bin/ssh on Ubuntu 16.04, without any instrumentation (open, get default module, get procedures, save).

Thanks,

Mohamed

On Tue, May 31, 2016 at 11:37 AM John Detter <jdetter@xxxxxxxx> wrote:

Mohamed,

Are you sure you are using the latest master? In my version of
arch-x86.C line 7993 isn't inside the ia32_decode function. Could you
try pulling from master and rebuilding/rerunning? If you could provide
another stack trace that would be really helpful.

-- John

P.S. here is the latest commit information for master
(http://github.com/dyninst/dyninst):

commit df1523dd4003107b959046dd047402642f530c43
Merge: 85cebd3 06c649f
Author: Bill Williams <wwilliam47@xxxxxxxxx>
Date:Â ÂFri May 27 14:37:50 2016 -0500

  ÂMerge pull request #61 from
dyninst/Functions_not_filed_into_correct_Modules

  ÂFix Function/Module mapping

On 5/30/2016 9:06 PM, Mohamed Elsabagh wrote:
> There seems to be a different issue now: calling getProcedures() on
> the default module of a stripped PIE results in an assertion failure
> at common/src/arc-x86.C:7993. It seems that the heuristic gap parser
> is trying to decode the assembly as x86_32 instead of x86_64 (I may be
> wrong though). Exact stack trace is attached.
>
> This is triggered by simply opening the binary, getting the default
> module, then calling getProcedure.
>
> Sample offending program is /usr/bin/ssh on Ubuntu 16.04 x86_64.