Tags: seccomp sandbox shellcode 

Rating: 4.0

Here's the link to a detailed writeup - [Writeup](https://blog.bi0s.in/2020/08/24/Pwn/GCTF20-Writeonly/)

Original writeup (https://blog.bi0s.in/2020/08/24/Pwn/GCTF20-Writeonly/).