Hey there,
a quick update: The issue seems to be that the ELF file has legitimate
shdrnum=0 in the header,
which some of the other code is not prepared for.
Cheers,
Thomas
On Thu, Jan 11, 2018 at 11:36 AM, Thomas Dullien <thomasdull...@google.com>
wrote:
> Hey there,
>
> I am trying to run a particular ELF file through Dyninst, but I get a
> segfault
> in Elf_X.C:
>
> if (!shdrs[i]._elf) {
>
> The trouble is that shdrs is an empty vector, and i is 0, so we can't
> dereference
> at index 0.
>
> #0 Dyninst::Elf_X::get_shdr (this=this@entry=0x557c15ecf0a0, i=0) at
> /home/thomasdullien/Desktop/sources/dyninst/dyninst/elf/src/Elf_X.C:473
> #1 0x00007fd72b83f43a in Dyninst::Elf_X::findDebugFile
> (this=0x557c15ecf0a0, origfilename="/home/thomasdullien/Downloads/foo.elf",
> output_name="", output_buffer=@0x7fff5398c320: 0x557c15ecf470
> "/home/thomasdullien/Downloads/foo.elf", output_buffer_size=@0x7fff5398c
> 328: 93991432156048) at /home/thomasdullien/Desktop/
> sources/dyninst/dyninst/elf/src/Elf_X.C:1659
> #2 0x00007fd72ba5b124 in Dyninst::Dwarf::DwarfHandle::locate_dbg_file
> (this=this@entry=0x557c15ecf3d0) at /home/thomasdullien/Desktop/
> sources/dyninst/dyninst/dwarf/src/dwarfHandle.C:80
> #3 0x00007fd72ba5b29f in Dyninst::Dwarf::DwarfHandle::DwarfHandle
> (this=0x557c15ecf3d0, filename_=..., file_=<optimized out>,
> err_func_=<optimized out>) at /home/thomasdullien/Desktop/
> sources/dyninst/dyninst/dwarf/src/dwarfHandle.C:73
> #4 0x00007fd72ba5b9ff in Dyninst::Dwarf::DwarfHandle::createDwarfHandle
> (filename_="/home/thomasdullien/Downloads/foo.elf",
> file_=file_@entry=0x557c15ecf0a0,
> err_func_=err_func_@entry=0x7fd72ba5b010 <Dyninst::Dwarf::DwarfHandle::
> defaultDwarfError(Dwarf_Error_s*, void*
> )>) at /home/thomasdullien/Desktop/sources/dyninst/dyninst/dwarf/
> src/dwarfHandle.C:249
>
> Shall I try to dig further, or should this be sufficient to find the
> problem?
>
> Cheers & keep up the good work :-)
> Thomas
>
>
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