Update readme table

Author: meowmeowxw

README.md

@@ -6,3 +6,13 @@ eventually with writeups.
 The exploits are written by me and my CTF team.
 
 Inside every CTF challenge there is `extract.sh` to extract initramfs.
+
+## CTF
+
+| Challenge | Summary | Writeup |
+| --- | --- | --- |
+| [Klibrary](./ctf/3k-2021-klibrary) | UAF + race condition (SLUB) | :heavy_check_mark: |
+| [Pprofile](./ctf/line-2021-pprofile) | Unchecked copy_to_user | :heavy_check_mark: |
+| [Hashbrown](./ctf/dice-2021-hashbrown) | UAF + race condition (SLAB) | :x: |
+| [Kernel-Rop](./ctf/hxp-2020-kernel-rop) | ROP chain with KPTI+SMAP+SMEP+KASLR-FG | :x: |
+| [Atoms](./ctf/hitcon-2020-atoms) | Kernel deadlock | :x: |