Video
Store→Load Reordering: x86 vs ARM64 Real-World Test
What really happens when CPUs reorder your instructions. Side-by-side experiment putting store→load reordering to the test on x86-64 and ARM64.
[ 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.
Video
Cache Miss, TLB Miss & False Sharing — The Performance Killers in 3 Minutes
Three invisible bottlenecks that silently destroy program performance — cache miss, TLB miss, false sharing — demonstrated with real C code and CPU counter data.
Video
Debugging Ubuntu 6.8 x86_64 Kernel with GDB & QEMU — Disable KASLR Without Rebuild
Build and debug the Ubuntu 6.8 x86_64 kernel from source with debug symbols, then attach GDB via QEMU. Includes the trick for disabling KASLR without rebuilding.
Video
Debugging Real-Mode Bootloader in GDB (CS Changed, Symbols Broken)
How to debug a hand-written x86 assembly bootloader with GDB symbols — even across far jumps and segment changes. The trick most tutorials skip.
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.
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.