AFAIK, some programs cannot be re-compiled with stackguard, but it seems to be a good idea to compile a few sensitive stuff with it, though. i don't have any experiences with libsafe, but you might want to read an article in phrack magazine issue 58 on beating methods that try to prevent code execution on the stack: http://packetstorm.linuxsecurity.com/mag/phrack/phrack58.tar.gz
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