Re: function addresses and ld.so

[Ian Lance Taylor <ian@airs.com>]

Richard Henderson <rth@redhat.com> writes:

> On Wed, Aug 13, 2003 at 04:35:36PM -0700, David Mosberger wrote:
> > Wouldn't, e.g., LD_PRELOADing something break this assumption?
> 
> Yes.  Or, indeed, just recompiling the library could result
> in different PLT offsets within the DSO, even on x86.
> 
> This behaviour is completely broken.  It'll never work reliably.

The unexec function needs to know about the PLT, and it needs to do
the right thing.

The emacs unexec function used to do this for SunOS shared libraries
(which were the basis for ELF shared libraries).  It is at least
theoretically possible to handle this correctly.

Ian