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Is it possible to restart over a program by calling an entry point function?

I was wondering if it was possible to restart a program (ignoring previously mapped files) with different argument by either calling main() or a glibc entry point function.
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Is it possible to rebuild an nexe file if I can read at arbitrary untrusted memory addresses?

Ok, I’m in a remote situation where I don’t have access to the remote filesystem but where I can run arbitrary python code (except I can’t fork processes and I don’t have access to ulimit and uname). ...