Re: [Elftoolchain-developers] elf_update() returns error "Invalid data buffer descriptor" on FreeBSD 10.3

[Ed M. <em...@fr...>]

On 15 May 2016 at 16:43, Sam Habiel <sam...@gm...> wrote:
> First time on list,
>
> Failure here: https://github.com/shabiel/fis-gtm/blob/freebsd/sr_x86_64/obj_filesp.c#L322
>
> I added a line after it:
>                 FPRINTF(stderr, elf_errmsg(elf_errno()));
>
> And this line says: Invalid data buffer descriptor.
>
> Ports tree libelf doesn't have this problem.
>
> root@:~/repos/fis-gtm # uname -a
> FreeBSD  10.3-RELEASE FreeBSD 10.3-RELEASE #0 r297264: Fri Mar 25
> 02:10:02 UTC 2016
> ro...@re...:/usr/obj/usr/src/sys/GENERIC  amd64

To confirm, this is the libelf in the FreeBSD source tree, not the
upstream elftoolchain version? If so, can you test the upstream
version? I don't anticipate any differences, but it will be a better
base for experimentation and debugging.

I see three
LIBELF_SET_ERROR(DATA, 0);
in libelf/elf_update.c. If you can run the application under a
debugger I would set a breakpoint on them and see which case returned
the error, which should give a suggestion on next steps.

-Ed