How CPUs Access Hardware - Another SerenityOS Exploit

When I looked at another SerenityOS exploit, I learned something new! The hack is very creative and directly interacts with hardware. I never really understood how modern CPUs interact with peripherals, so this was very interesting to me.

Previous SerenityOS videos:
https://www.youtube.com/watch?v=qUh507Na9nk
https://www.youtube.com/watch?v=oIAP1_NrSbY

Linus' wisdom2 exploit: https://github.com/allesctf/writeups/blob/master/2020/hxpctf/wisdom2/writeup.md
SerenityOS hacking: https://www.youtube.com/watch?v=DhVZ7vO69DI&list=PLMOpZvQB55bcRA5-KjvW7dVyGUarcqZuL
Vulnerable SerenityOS version: https://github.com/SerenityOS/serenity/tree/5505159a94c226d0c8a5e82a163a6d37a9404c57

Binary Exploitation Playlist: https://www.youtube.com/watch?v=iyAyN3GFM7A&list=PLhixgUqwRTjxglIswKp9mpkfPNfHkzyeN
Hardware Wallet Research: https://www.youtube.com/watch?v=nNBktKw9Is4&list=PLhixgUqwRTjyLgF4x-ZLVFL-CRTCrUo03

00:00 - Intro
00:47 - Accumulating Knowledge Over Years
01:14 - The Plan For This Video
02:00 - Computers are Simple!
02:40 - Computers are Hard!
03:39 - What I Already Know About Kernels
04:58 - Missing Link Between Hardware and Software
06:00 - Andreas Summarizes Another SerenityOS Exploit
08:18 - What Are CPU EFLAGS?
11:02 - What Are IO Ports?
12:03 - Playing With EFLAGS
13:06 - Talking To Hardware via IO Ports
13:45 - Arduino Hardware Example - OUT Instruction
14:45 - Access Harddisk Controller With Ports
15:15 - Detecting Keybord Key Press
15:43 - EUREKA!
16:46 - Outro

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Видео How CPUs Access Hardware - Another SerenityOS Exploit канала LiveOverflow