dgl
Joined 19 years ago
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May 24
https://dgl.cx
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Comment · 1 month ago
As someone who has worked on IRC protocols, I wanted to understand how this actually works, but the docs are so LLM generated this is not worth my time:
Everything that carries what somebody said is written down as owed to each instance it is owed to, and delivered from there: a direct message, which has nowhere else to come from, and a channel message, which used to be offered once and forgotten.
The forgetting was not obvious, because it usually did not show. An instance that had gone away noticed on the way back and walked the feed in section 7, and the message arrived late rather than never.
Comment · 1 month ago
Even if they are good the vulnerabilities have to be there. There's lots of things turning up like Local Privilege Escalations (LPE) in Linux, but serious people didn't expect the kernel to be a boundary for a sophisticated attacker.
A lot of the vulnerabilities LLMs are finding now are the "long tail" and affect only particular configurations, I would be surprised if e.g. a widely applicable RCE is found in Linux (but I'm also not going to bet against it).
Where this gets interesting is the long tail can be used to target a particular system and this is where defense-in-depth becomes important for every organisation.
Comment · 2 months ago
They are QSFP56-DD which can be split using breakout cables. So it's 4 x 400GbE ports, which could in theory be split into as many as 32 x 50GbE ports. (Although whether that then ends up being an economical thing to do is a different matter.)
Comment · 2 months ago
I put a short link on a family thing and someone complained it didn't work. Turns out iOS OCR recognised a "-" as a "=", so this isn't just people typing it wrong.
Now my short links implement case insensitivity and striping all non alphanumeric characters, i.e. a "-" is optional and any other symbol character is also stripped.
nyc.gov seems to do case insensitivity but doesn't strip "-", so you do need the "-".
Comment · 2 months ago
Simple -- you just add a custom SQLite VFS that ensures particular SQLite pages are mapped into underlying OS pages that are appropriately mprotect()ed. Try to modify the executable pages and you crash (W^X). Or you know, don't try to use a hack like this where security matters.
SQLite's unix VFS is actually using a mixture of mmap and write() by default[1] and you'd need to combine that with mseal() and some more pieces to actually pull it off. It would probably be possible.
(There's prior art here; although done differently: https://sqlite.org/src/file/ext/misc/appendvfs.c).
Comment · 4 months ago
Zip isn't useful for random access here; the problem with random access in HTTP serving is then you have to decompress the data and potentially recompress.
The more interesting trick you can do with zip files for HTTP serving is to serve the compressed deflate stream as gzip, or use Zstd inside zip. Then you have a valid zip file from which bytes can be served directly.
I have some code which does this at https://git.sr.ht/~dgl/deserve/
Comment · 6 months ago
I tried using their Magic Containers product and there were issues that showed a lack of attention to detail as well.
It's supposed to scale globally (magically!) but I found multiple cases where particular nodes were problematic and the health checks didn't detect them (in fact to start with the health checks didn't even work properly if you had multiple containers, they did fix that). The support was quite slow too, after finding multiple product issues they'd escalate to developers and then come back a month later and ask to retest, but some of this took multiple round trips. I was only using this on a side project, but definitely wouldn't consider them for anything critical, even if they are quite cheap.
Comment · 7 months ago
FreeBSD has supported Linux emulation for a long time (https://docs.freebsd.org/en/books/handbook/linuxemu/). The emulation is at the syscall level but enough to run most apps.
Comment · 8 months ago
GitHub manage to do it. Most URLs you'd think of are either redirects to other bits of the site, or accounts owned by GitHub themselves. It just takes a bit of planning.
Comment · 9 months ago
> Part #2 to me, I also want observability as to what the agent changed.
You could potentially combine https://github.com/binpash/try with bubblewrap (I'm not sure how well they compose and as the docs say it isn't a full sandbox).
The good (and bad because it's confusing and can lead to surprises if misconfigured) thing about Linux containers is all the pieces of containers can be used independently. The "try" tool lets you use the overlay part of containers on your host system, just like Bubblewrap lets you combine the namespacing parts of containers with your host system.
Comment · 9 months ago
This.
Instead you can create multiple Wireguard interfaces and use policy routing / ECMP / BGP / all the layer 3 tricks, that way you can achieve similar things to what vxlan could give you but at layer 3.
There's a performance benefit to doing it this way too, in some testing I found the wireguard interface can be a bottleneck (there's various offload and multiple core support in Linux, but it still has some overhead).
Comment · 11 months ago
The BSD socket API has 3 parameters when creating a socket with socket(), the family (e.g. inet) the kind (datagram in this case) and the protocol (often 0, but IPPROTO_ICMP in this case).
Because when the protocol is 0 it means a UDP socket Rust has called its API for creating any(?) datagram sockets UdpSocket, partly resulting in this confusion.
The kernel patch introducing the API also explains it was partly based on the UDP code, due to obviously sharing a lot of properties with it. https://lwn.net/Articles/420800/