exec-shield workaround take 2

[Mike McCormack]

Hi Mike,

Mike Hearn wrote:

> It seems it's turned from being an normal (albiet static) app which
> reserves the areas needed then boots wine, into a reimplementation of
> ld-linux.so? I'm not sure it's a good plan to alter the .interp field -
> that has to be absolute and this technique would break binary
> relocatability.
> 
> thanks -mike

At least in the Linux kernel, the ELF interpreter is loaded from the 
current directory if it is not an absolute path.  In this 
implementation, I have forced the current directory to be the same as 
the binary's directory, and saved the working directory in an 
environment variable WINEWORKDIR.

The reason for doing this was to save the hastle of passing yet another 
round of extra argv[0]'s to the execv.  If it's determined that this 
method is not portable,  it's easy enough to go back to the other method 
of using an executable instead of replacing the ELF interpreter.

In any case, this patch seems to work, and is not limited by binary 
relocatability.

Mike