src VS Lemmy

The OpenBSD project released 7.4 of their OS on 16 Oct 2023 as their 55th release 💫

Well since https://www.openbsd.org/ still says

> Only two remote holes in the default install, in a heck of a long time!

I'm assuming not, but I could always be mistaken.

> building a cat from scratch

> That would be an interesting project.

Here is the source code of the OpenBSD implementation of cat:

> https://github.com/openbsd/src/blob/master/bin/cat/cat.c

and here of the GNU coreutils implementation:

> https://github.com/coreutils/coreutils/blob/master/src/cat.c

Thus: I don't think building a cat from scratch or creating a tutorial about that topic is particularly hard (even though the HN audience would likely be interested in it). :-)

> I don't know how they define `MAX`, but I'm guessing it's a typical "a>b?a:b"

Indeed: https://github.com/openbsd/src/blob/master/sys/sys/param.h#L...

> Then `SYS_kbind` seems to be a signed int.

It's an untyped #define: https://github.com/openbsd/src/blob/master/sys/sys/syscall.h...

I believe your whole analysis is correct, that running an elf file with an openbsd.syscalls entry with .sysno > INT_MAX will allow an out-of-bounds write.

I can reproduce it. And this is the commit that causes the issue: https://github.com/openbsd/src/commit/d21788ce70be80e9c4ed0c52c149e01147c4a823

This doesn’t really change your conclusion, but I think that’s the wrong file. This is the real doas afaict: https://github.com/openbsd/src/blob/master/usr.bin/doas/doas...

Still just a tidy 1072 lines in that folder though.

I spent 5 minutes staring at your file trying to understand how on earth it does the things in the man page, but of course it doesn’t.

OpenBSD developers are making serious effort to kill off indirect syscalls, the base system is completely clean, take a look at the work Andrew Fresh did to adapt Perl. He write a complete syscall "dispatcher" or emulator for the Perl syscall function so that it calls the libc stubs.

https://github.com/openbsd/src/commit/312e26c80be876012ae979...

The ports tree is also being cleansed of syscall(2) usage, until they're all gone.

msyscall, pinsyscall, recent mandatory IBT/BTI, xonly. OpenBSD is making waves, but people aren't really seeing them yet.

Actually, I got it wrong, too many vulnerabilities in flight. They did fix it: https://github.com/openbsd/src/commit/375ccafb2eb77de6cf240e...

Lemmy is like Reddit and here because it has threaded comment discussions.

It's also federated, so you can pick a server you like and have discussions with users from various servers together.

https://join-lemmy.org/

Some Reddit apps switched to supporting Lemmy instead when they were kicked off the API.

Seems functionally similar to Lemmy: https://github.com/LemmyNet/lemmy

There was some talk back in June of migrating or setting up a parallel community on Lemmy. Did anything ever come of that? If not, would anyone be interested in helping set one up?

Because they are all different deployments of Lemmy [0]?

[0] https://join-lemmy.org

Local servers (dietpi, Freedombox, YUNoHost or similar solutions) which can be used to host different solarpunk content and setup instances on the fediverse (like peertube, mastodon, Lemmy etc.)

The entire page is based on Lemmy (https://join-lemmy.org/).

I disabled a ton of features and interface parts, as IMO the original lemmy interface is super noisy.

Runs on bare-metal with docker-compose. For the facelift, just good old CSS :)

Jerboa for Lemmy (version 0.0.46): An app for Lemmy, a federated reddit alternative.