CTFtime.org / Codegate CTF 2018 Preliminary / Useless returnz / Writeup

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Cantonese and English writeup.

[https://github.com/harrier-lcc/CTF-writeup/tree/master/2018/codegate-quals/useless-returnz](https://github.com/harrier-lcc/CTF-writeup/tree/master/2018/codegate-quals/useless-returnz)