Thanks to Martin Moore and Jan Mark Holzer for quick replies.
The non-executable stack is configured by default in (at least) 5.1a.
It is set with an option configurable via sysconfig:
vm:
        executable_stack = 0 (disallowed)
There is info in the man page for sys_attrs_proc. 
I do not know the status of this parameter in 5.0*. 
Thanks very much, 
Judith Reed
Received on Mon Feb 18 2002 - 14:46:08 NZDT