Gynvael Coldwind 🐈

4.2K Followers
305 Following
210 Posts
security researcher/programmer ⁂ previously security team @ Google ⁂ Dragon Sector CTF founder/player ⁂ technical livestreamer ⁂ slide maker ⁂ he/him
YouTube[EN]https://www.youtube.com/@GynvaelEN
YouTube[PL]https://www.youtube.com/@GynvaelColdwind
Bloghttps://gynvael.coldwind.pl
Twitterhttps://twitter.com/gynvael

My second article in Paged Out! #8 was about the architecture of the terminal emulator on Linux - it's a really obvious thing until you start digging into details, as usual.

Web viewer: https://pagedout.institute/webview.php?issue=8&page=43&article=Linux+terminal+emulator+architecture
PDF download: https://pagedout.institute/?page=issues.php

Pwndbg 2026.02.18 is out! Enhance your GDB or LLDB experience!

We visualize branches in nearpc, synchronize your decompiler (IDA/Binja/Ghidra) via decomp2dbg, annotate stack variabless from debug info or decompiler, support new Linux kernel debugging commands - for tracing SLUB allocs/frees or dumping tasks information.

See what's changed in: https://github.com/pwndbg/pwndbg/releases/tag/2026.02.18

Want Pwndbg to keep moving fast, or, having us give a talk about it? Sponsor us: https://github.com/sponsors/pwndbg/

#gdb #lldb #pwndbg #pwn #ctf #reverseengineering

Paged Out! #8 is out! https://pagedout.institute/ @PagedOut

In "An AWKward Modem" (p. 28), I demonstrate how to write a tiny modem in 5 lines of AWK and shift it into the near-ultrasonic range. πŸ”Š

https://seriot.ch/misc/awkward_modem.mp4

Today in InfoSec Job Security News:

I was looking into an obvious ../.. vulnerability introduced into a major web framework today, and it was committed by username Claude on GitHub. Vibe coded, basically.

So I started looking through Claude commits on GitHub, there’s over 2m of them and it’s about 5% of all open source code this month.

https://github.com/search?q=author%3Aclaude&type=commits&s=author-date&o=desc

As I looked through the code I saw the same class of vulns being introduced over, and over, again - several a minute.

Build software better, together

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Just got this link on my discord - https://www.kickstarter.com/projects/bitman/bootblock-rebels - passing it along because this book looks fun!
Bootblock Rebels

The Hidden Stars of the Amiga Underground. Stories from the Amiga Cracking Scene.

Kickstarter
A useful chart on what type to use for flags in C/C++ depending on your D&D alignment:
If you're interested in obscure details of the microcode in the Intel 8087 floating-point chip, I have a new blog post...
https://www.righto.com/2025/12/8087-microcode-conditions.html
Conditions in the Intel 8087 floating-point chip's microcode

In the 1980s, if you wanted your computer to do floating-point calculations faster, you could buy the Intel 8087 floating-point coprocessor ...

Glitches in games, especially used for speedrunning, are one of the most fun aspects of hacking to watch!

As an example, check out this video "How Speedrunners BEAT Hollow Knight Silksong In 10 Minutes!" by Abyssoft

https://www.youtube.com/watch?v=M6Jnj-y0G9w

How Speedrunners BEAT Hollow Knight Silksong In 10 Minutes!

YouTube

Ah Saturday morning! What a great time to...

...write a 1-page article for Paged Out! zine!

Deadline is 4th Jan - just a week away.

CFP: https://pagedout.institute/?page=cfp.php

Paged Out!

Deeply technical zine. And it's free.

Paged Out!