Video
How x86 Jumps REALLY Work: EFLAGS Truth with GDB + pwndbg
All x86 conditional jumps (ja, jb, je, etc.) are triggered by EFLAGS — not by syntax or code order. Hands-on with GDB and pwndbg to see exactly which flag fires each branch.
[ SECURITYLAB ]
SecurityLab track — runtime and distributed systems, kernel debugging, eBPF, Go concurrency, memory models, bootloaders, and assembly walkthroughs. Code-first, source-cited, mechanism-deep.
Long-form writing and video on runtime, distributed systems, and kernel internals — the layers below the application where most production reliability is actually decided.
Topics: Go runtime and concurrency, distributed systems patterns (RPC, queues, idempotency), kernel debugging with GDB/QEMU, eBPF, memory models, bootloaders, and assembly walkthroughs.
Companion to the HarrisonSecurityLab YouTube channel. Blog and video are listed below — most recent first.
Blog
Rust vs C Assembly: Complete Performance and Safety Analysis - Panic or Segfault?
Deep dive comparison of Rust and C at assembly level. See how Rust's memory safety, bounds checking, and zero-cost abstractions compare to C's raw performance through actual GDB debugging sessions and assembly analysis.
Video
How to Build a Bootloader from Scratch — Just Assembly, No OS
Hand-written Stage-1 bootloader in raw x86 assembly. No GRUB, no operating system, no standard library. Boots directly from BIOS.
Blog
Legacy Compatibility Lab: My Full Stack for Reviving Dead Software
A comprehensive documentation of my virtualized environment stack designed to analyze, patch, and rebuild legacy Windows applications — from XP-era binaries to modern Win10 apps needing backwards compatibility.
Blog
Placed 2nd at BSides Vancouver 2025 Blue Team CTF – With Just ChatGPT and Stubbornness
How I placed 2nd solo at BSides Vancouver 2025 Blue Team CTF using only ChatGPT and Splunk: threat hunting, incident response, registry forensics, and AI-driven analysis.
Video
HarrisonSec Lab Tour | A Journey Through Computing Evolution
Join me on a tour of my security lab, where I explore the evolution of operating systems from FreeDOS to modern AI-driven security research.
Video
Complete Secure Company Network Design
A comprehensive 3-hour demonstration of how to design and implement a secure enterprise network with multiple security zones, VLANs, and proper firewall configuration
Video
Buffer Overflow Attack Explained
This is one of the clearest demonstrations of a buffer overflow attack I've seen, where Dr. Mike Pound not only explains the theory but shows the complete attack process, invaluable for security learners