According to Carl S Shapiro:
>
>Is there any way to prevent the stack from being executable?
>

For the i386 architecture there was some linux hacks that would stop
the stack being executable - dunno how portable they would be, if at
all.  You need to be careful about doing this though as the changes
are more than just a kernel hack.  IIRC gcc relies on an executable
stack for some of it's trampoline code which means that some things
could break with a non-executable stack.  The up side is that it does
provide a convenient method of preventing the fixed-buffer overrun type
exploits that are currently fashionable in the cracker community.

-- 
Brett Lymn, Computer Systems Administrator, British Aerospace Australia
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  What do you get when you cross a cantaloup with a dog?        Melancholy :-P