offlinemark

@UCsVELe77-bXS3vCLWbDoibw - 14.9K subscribers

(Streams in "Live" tab. Streaming Sundays 10a ET) — Sharing what I know about low level programming, assembly, and operating systems internals :) New here? See offlinemark.com/welcome From Feb 2024 - May 2025, I streamed myself doing the labs for MIT's 6.828 course: Operating Systems Engineering (2018). Now, I'm continuing on my own os development journey I’m a software engineer, formerly working in infosec and now working in music tech. I found a memory corruption bug in LLDB once and also have a small patch in the Linux kernel. I'm not an expert, just trying hard and sharing what I've learned so far. Apart from programming, I like producing music, blogging, and making art :) See you in a stream! (Sundays 10am-12pm ET / 4-6p CET) and a special thank you for the support to: - ismail - lzrd - digitulized - catflare - afnan - jonpalmisc - shivang - handle

Home Videos Live Playlists

building my own operating system in c++ (week 105, intel assembly syntax)

building my own operating system in c++ (week 105, intel assembly syntax) offlinemark

5.3K views - 2 weeks ago

building my own operating system in c++ (week 100!, virtual memory unmap)

building my own operating system in c++ (week 100!, virtual memory unmap) offlinemark

2K views - 1 month ago

building my own operating system in c++ (week 96, page tables)

building my own operating system in c++ (week 96, page tables) offlinemark

2.6K views - 2 months ago

building my own operating system in c++ (week 95, physmap)

building my own operating system in c++ (week 95, physmap) offlinemark

9K views - 2 months ago

building my own operating system in c++ (week 94, physmap)

building my own operating system in c++ (week 94, physmap) offlinemark

3.7K views - 3 months ago

building my own operating system in c++ (week 87, multiboot2)

building my own operating system in c++ (week 87, multiboot2) offlinemark

4.3K views - 4 months ago

chill kernel hacking in C (week 70, grub boot pt1)

chill kernel hacking in C (week 70, grub boot pt1) offlinemark

4.9K views - 8 months ago

chill kernel hacking in C // code with me (week 62, PCI network driver)

chill kernel hacking in C // code with me (week 62, PCI network driver) offlinemark

3.3K views - 10 months ago

how I rewrite git history for better code review (for my hobby OS)

how I rewrite git history for better code review (for my hobby OS) offlinemark

953 views - 10 months ago

chill kernel hacking in C // code with me (week 54)

chill kernel hacking in C // code with me (week 54) offlinemark

1.7K views - 1 year ago

chill kernel hacking every week (week 48, debug cow fork)

chill kernel hacking every week (week 48, debug cow fork) offlinemark

1.4K views - 1 year ago

chill kernel hacking for fun (week 44, user page fault + assembly)

chill kernel hacking for fun (week 44, user page fault + assembly) offlinemark

1.5K views - 1 year ago

chill kernel hacking for fun (week 38, debug stack switch crash)

chill kernel hacking for fun (week 38, debug stack switch crash) offlinemark

1.7K views - 1 year ago

chill kernel hacking for fun (week 34, boot debug)

chill kernel hacking for fun (week 34, boot debug) offlinemark

2.1K views - 1 year ago

recap of my kernel hacking stream (week 34, boot debug)

recap of my kernel hacking stream (week 34, boot debug) offlinemark

421 views - 1 year ago

chill kernel hacking for fun (week 33, multicore 1)

chill kernel hacking for fun (week 33, multicore 1) offlinemark

2.7K views - 1 year ago

recap of my kernel hacking stream (week 33, syscalls)

recap of my kernel hacking stream (week 33, syscalls) offlinemark

495 views - 1 year ago

chill kernel hacking for fun (week 32, syscalls)

chill kernel hacking for fun (week 32, syscalls) offlinemark

6.6K views - 1 year ago

recap of my kernel hacking stream (week 32, syscalls)

recap of my kernel hacking stream (week 32, syscalls) offlinemark

698 views - 1 year ago

recap of my kernel hacking stream (week 31, multicore)

recap of my kernel hacking stream (week 31, multicore) offlinemark

247 views - 1 year ago

kernel hacking until i'm cracked (week 30, syscalls)

kernel hacking until i'm cracked (week 30, syscalls) offlinemark

302 views - 1 year ago

kernel hacking until i'm cracked (week 29, interrupts 2)

kernel hacking until i'm cracked (week 29, interrupts 2) offlinemark

801 views - 1 year ago

kernel hacking until i'm elite (week 28)

kernel hacking until i'm elite (week 28) offlinemark

582 views - 1 year ago

short recap of my kernel dev stream (Week 27)

short recap of my kernel dev stream (Week 27) offlinemark

2.6K views - 1 year ago

Watch me debug my kernel's ELF loader | Stream Recap | Week 26

Watch me debug my kernel's ELF loader | Stream Recap | Week 26 offlinemark

478 views - 1 year ago

Watch me debug my kernel's ELF loader (Week 26 Hobby Kernel Dev)

Watch me debug my kernel's ELF loader (Week 26 Hobby Kernel Dev) offlinemark

1.3K views - 1 year ago

quick recap of my kernel dev stream (Week 25)

quick recap of my kernel dev stream (Week 25) offlinemark

1.5K views - 1 year ago

🌿 E12: Weekly kernel dev gardening: C header cleanup speedrun pt 2 🌿

🌿 E12: Weekly kernel dev gardening: C header cleanup speedrun pt 2 🌿 offlinemark

2.9K views - 1 year ago

🌿 E10: Weekly kernel dev gardening: Assert Infra, Headers, C macros, Vim macros 🌿

🌿 E10: Weekly kernel dev gardening: Assert Infra, Headers, C macros, Vim macros 🌿 offlinemark

665 views - 1 year ago

🌿 E7: Weekly kernel dev: Advanced Git, rebasing + history rewrite 🌿

🌿 E7: Weekly kernel dev: Advanced Git, rebasing + history rewrite 🌿 offlinemark

2.1K views - 1 year ago

c++ trivia: How big is a unique_ptr with a custom deleter?

c++ trivia: How big is a unique_ptr with a custom deleter? offlinemark

466 views - 1 year ago

🌿 E5: Weekly kernel dev gardening: clang-format in VSCode, out of tree build 🌿

🌿 E5: Weekly kernel dev gardening: clang-format in VSCode, out of tree build 🌿 offlinemark

420 views - 1 year ago

🌿 E4: Weekly kernel dev gardening: Even more Build system refactor & cleanup 3 🌿

🌿 E4: Weekly kernel dev gardening: Even more Build system refactor & cleanup 3 🌿 offlinemark

801 views - 1 year ago

🌿 E3: Weekly kernel dev gardening: More build system refactor & cleanup 2 🌿

🌿 E3: Weekly kernel dev gardening: More build system refactor & cleanup 2 🌿 offlinemark

1.8K views - 1 year ago

vlog2: Kernel & userspace debugging (xv6 beginner kernel dev)

vlog2: Kernel & userspace debugging (xv6 beginner kernel dev) offlinemark

531 views - 2 years ago

vlog: OSdev for busy, curious beginners like me (don't start from scratch)

vlog: OSdev for busy, curious beginners like me (don't start from scratch) offlinemark

2.2K views - 2 years ago

FIFO basics & simple IPC logger

FIFO basics & simple IPC logger offlinemark

408 views - 2 years ago

SerenityOS Day 1: Debugging the piano app

SerenityOS Day 1: Debugging the piano app offlinemark

1.3K views - 2 years ago

Observing hidden locks emitted by clang

Observing hidden locks emitted by clang offlinemark

158 views - 2 years ago

How to build a Linux kernel 101 (+out of tree build, +cross compile) (screencast)

How to build a Linux kernel 101 (+out of tree build, +cross compile) (screencast) offlinemark

1.7K views - 2 years ago

How debugger watchpoints work on x86

How debugger watchpoints work on x86 offlinemark

528 views - 3 years ago

The niche optimization everyone (incorrectly) assumes still exists in libpthread

The niche optimization everyone (incorrectly) assumes still exists in libpthread offlinemark

545 views - 4 years ago

A hyper-subtle implementation detail of the Linux kernel's page fault handler

A hyper-subtle implementation detail of the Linux kernel's page fault handler offlinemark

538 views - 5 years ago

Everything I know about software licensing (Basics, Dual Licensing, Permissive Comparison)

Everything I know about software licensing (Basics, Dual Licensing, Permissive Comparison) offlinemark

359 views - 5 years ago

Allocating 100 GB and touching it all (Demand Paging Pt 1)

Allocating 100 GB and touching it all (Demand Paging Pt 1) offlinemark

647 views - 5 years ago

Getting killed by the OOM killer due to page tables (Demand Paging Pt 2)

Getting killed by the OOM killer due to page tables (Demand Paging Pt 2) offlinemark

457 views - 5 years ago

vlog: lldb memory corruption bug (pt 1)

vlog: lldb memory corruption bug (pt 1) offlinemark

427 views - 5 years ago

vlog: lldb memory corruption (pt 2)

vlog: lldb memory corruption (pt 2) offlinemark

257 views - 5 years ago

Digging into the Linux Kernel to understand how /proc/self/mem bypasses permissions

Digging into the Linux Kernel to understand how /proc/self/mem bypasses permissions offlinemark

2.6K views - 5 years ago