Problem with elf and dynamic loading ...

Problem with elf and dynamic loading ...

[Damien TOURAINE]

Hi !

I'm using dynamic library to load some part of a big software (that use 
several differents modules).
The main program fully use the symboles of the shared object (through 
the dlsym command), however, the functions available in the module are 
not able to use the symbols of the main program.

Is-it a bug of the kernel ?
Is-it to avoid a potential hole of security ?

My system :
Computer : SONY Notebook with a PCMCIA network card and SCSI cardbus.
Kernel : 2.2.18
  I tryied to compile and launch 2.4 -test13, however, I think I didn't 
have the right parameters for the compilation because it don't manage to 
get the bash (still try to compile it) ...
Glibc : 2.2
miscellanous : fully use the elf format, have recompiled the glibc 2.2 
from the GNU tree, have also recompile linux from the kernel.org.

Friendly
  Damien TOURAINE

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Damien TOURAINE	- +33 1 69 85 81 68
PhD student at LIMSI - CNRS (http://www.limsi.fr)
Bat. 508, Universite Paris-Sud F-91403 Orsay cedex (France)
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Re: Problem with elf and dynamic loading ...

[Andreas Jaeger]

>>>>> Damien TOURAINE writes:

 > Hi !
 > I'm using dynamic library to load some part of a big software (that
 > use several differents modules).

 > The main program fully use the symboles of the shared object (through
 > the dlsym command), however, the functions available in the module are
 > not able to use the symbols of the main program.


 > Is-it a bug of the kernel ?
 > Is-it to avoid a potential hole of security ?
That's a question for glibc - it has nothing to do with the kernel.
To get it to work, your program should be compiled with -Bdynamic.

Andreas
-- 
 Andreas Jaeger
  SuSE Labs aj@suse.de
   private aj@arthur.inka.de
    http://www.suse.de/~aj
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