Mark

trying hard. streaming kernel dev - about life, art & systems programming. non-expert
work: @ableton, ex @trailofbits

[Mark @offlinemark]

New kernel post! This time: /proc/*/mem and how it writes to unwritable mem.

Key takeaway: By walking page tables in software, the kernel can access userspace mem without directly dereferencing pointers it gets from userspace. (No WP/SMAP bits involved). https://t.co/U9IOeyHIc5

[Mark @offlinemark]

@valgutsu @oprydai ty

[Mark @offlinemark]

week 124, streaming kernel dev right now

discovered a dead end with my stack guard pages approach last stream, will regroup and decide on a final strategy for handling them this stream

see ya 👋

https://t.co/2LuetF8zee

[Mark @offlinemark]

@98erKAG @gxjo_dev @kneeanderthul ty bro

[Mark @offlinemark]

i'm going viral on some other part of this site lol

ty @gxjo_dev for posting and @kneeanderthul for crediting me

AMA about building an OS in c++ for 123 weeks in a row, all live-streamed

[gxjo @gxjo_dev]

while everyone is vibe coding SaaS clones
this guy is 119 weeks deep into building an operating system from scratch.

[Mark @offlinemark]

@bionicashish @gxjo_dev @kneeanderthul yes, since 2010 :)
https://t.co/DeXvkm0wla

[Mark @offlinemark]

@vaibhaw_vipul @gxjo_dev @kneeanderthul ty vipul for the support all this time!!

[Mark @offlinemark]

@grlsck @_JLRZ @gxjo_dev nothing worth having comes easy

[Mark @offlinemark]

for anyone that didn't know, I also make short form OS development content too lol

[Mark @offlinemark]

@0x4rt1 @gxjo_dev Yes, in fact it is only a kernel and will be that way for a long time

[Mark @offlinemark]

@__a_username_ @gxjo_dev @kneeanderthul Ty for the support all this time 🥹

[Mark @offlinemark]

@_JLRZ @gxjo_dev @grlsck I use AI codegen sometimes, but it's hard to call it vibe-coding

[Mark @offlinemark]

@gxjo_dev @web3devop damn right

[Mark @offlinemark]

@ThumKon18896 @gxjo_dev hi, it's me

[Mark @offlinemark]

@ekemini58110 @gxjo_dev thank you

[Mark @offlinemark]

@technoHimbo @gxjo_dev lol

[Mark @offlinemark]

@supernalmystic @gxjo_dev sadly i'm very much on socials LOL
here, instagram, tiktok, and more

[Mark @offlinemark]

@kneeanderthul @gxjo_dev thank you for the credit

[Mark @offlinemark]

week 123, streaming kernel dev right now

topic: stack guards + smart pointers

testing the stack guard support we developed last week, and also improving and iterating on the pool smart pointers

see ya 👋

https://t.co/gN11RHAbu3

[Mark @offlinemark]

week 122, streaming kernel dev right now

topic: stack guard pages

continuing with the custom allocator for task stacks, plus some smart pointer refactors

https://t.co/An9newzeZO

[Mark @offlinemark]

@falco_girgis i have no idea what you sound like but i love reading these tweets imagining someone shouting obscenities about std::chrono