Oh, you wanted to know where the #bytes go? Well, let's take a thrilling tour through the #labyrinth of #syscalls, because nothing screams excitement like relentless file paths and arcane #assembly #language. Spoiler alert: it's all gloriously tedious, but don't worry, your bytes are probably somewhere safe... or not.
https://flak.tedunangst.com/post/where-do-the-bytes-go #tech #thrill #HackerNews #ngated

Linux 6.15 will bring open_tree_attr() system call.

"Add open_tree_attr() which allow to atomically create a detached mount tree and set mount options on it. If OPEN_TREE_CLONE is used this will allow the creation of a detached mount with a new set of mount options without it ever being exposed to userspace without that set of mount options applied."

https://lore.kernel.org/all/20250128-work-mnt_idmap-update-v2-v1-3-c25feb0d2eb3@kernel.org/

Behold, the riveting saga of #syscalls on OpenBSD! Because, naturally, manually entering addresses for every build wasn't enough of a party . Now, watch in awe as one brave soul ports a "real" application to raw syscalls—truly, the Shakespeare of low-level programming!
https://nullprogram.com/blog/2025/03/06/ #OpenBSD #lowlevelprogramming #technews #softwaredevelopment #codingadventures #HackerNews #ngated

A more robust raw OpenBSD syscall demo

https://nullprogram.com/blog/2025/03/06/

Experimented with #ToaruOS today and wrote my first ever syscall. Not just for ToaruOS, but in general.

(I had to make the panic() function non-static for this to work, but it was worth it.)

It’s my first time really tinkering with ToaruOS’s internals at the code level so I’m very proud of myself.

May write a guide for this eventually, lemme know if you wanna see that. It’ll be on my blog.

Want to see how simple ASM can be and dilly-dally some more with syscalls and OS security mechanisms?

Then, "Let's Reflect: Simple ASM Review and OS Security Mechanisms"

Want to level up your low-level programming?

Check out yet another blog entry: https://dreaming-of-dragons.blogspot.com/2024/12/wherein-we-pause-to-reflect-simple-asm.html

A deep dive into Linux’s new mseal syscall:

https://blog.trailofbits.com/2024/10/25/a-deep-dive-into-linuxs-new-mseal-syscall/

A deep dive into Linux’s new mseal syscall:

https://blog.trailofbits.com/2024/10/25/a-deep-dive-into-linuxs-new-mseal-syscall/

After again struggeling with #emscripten and the wait4 / wait3 #syscalls, and stumbeling across my 1year+ old bug report on that matter, I just said "Fine, I do it myself" and added the two missing c sources to the build process of emscripten's #libc build xDDDDDD Works flawlessly lmao

A Linux kernel syscall implementation tracker
https://syscalls.mebeim.net/?table=x86/64/x64/latest
#ycombinator #linux #linux_kernel #syscalls #syscall_table #systrack

I appreciate the clarity and helpfulness of #rust ‘s error messages, I find myself apprehensive when dealing with #linux #syscalls. The potential for unexpected outcomes looms large, as a single oversight in comprehending the intricacies of the man page can quickly lead to unforeseen issues and the error messages are not helpful at all.

pinning all system calls https://www.undeadly.org/cgi?action=article;sid=20231209115835 #openbsd #systemcalls #syscalls #pinning #security

If someone's interested in learning how #syscalls work on #Linux, I recommend to check out the overview below

https://blog.packagecloud.io/the-definitive-guide-to-linux-system-calls/

It's a fascinating read that goes over software #interrupts, #sysenter & #syscall CPU instructions, #vDSO and more. BEWARE, it's a one-hour read!

I did a writeup on #Magniber - an obfuscated #ransomware using raw #syscalls to call functions. The writeup has more of a tutorial form, demonstrating usage of some of my tools (mainly #TinyTracer) in action, and also sharing some of my approaches & workflow. Check it out: https://hshrzd.wordpress.com/2023/03/30/magniber-ransomware-analysis/

Processes, Threads, Coroutines in Various Programming Languages.

Apart from giving an overview of the topic, I compare the runtime thread count of three different codes in five languages.

A hello world application.

An app that makes three blocking HTTP GET requests.

And finally an async/coroutine/green thread solution for making those same HTTP GET requests.

I was surprised by some results. :)

https://youtu.be/ehW2dv0IPIM

Code: https://github.com/simonracz/threads-streaming

#linux #threads #processes #coroutines #go #rust #java #c++ #c #python #syscalls

This morning has been a little crazy, but now that I am finally sitting at my desk, I am learning about vectored #syscalls today and how they can be used to evade #detection :D

You can list a directory containing 8 million files! But not with ls.

http://be-n.com/spw/you-can-list-a-million-files-in-a-directory-but-not-with-ls.html