### Summary
1. If you enter an invalid name, you can leak the pie address and libc address in the stack.
2. Filling the every value will result in a 4 byte overflow and can overwrite fd.
3. FSOP

Original writeup (https://blog.jsec.xyz/ctf-write-up/2021/03/22/Securinets-CTF-2021-pwn-write-up.html#success-957pts-12solves).