flow-pipeline VS src

Many Thanks to Cloudflare and dev.to for giving us this opportunity.

Unlike other providers in this list, Cloudflare is not just a serverless database platform. Instead, it’s a cloud connectivity platform that provides several web services. It’s one of the world's largest networks and serves 55 million HTTP requests per second.

Using a Content Delivery Networks (CDNs) such as Cloudflare, can help absorb large amounts of traffic and mitigate the impact of DoS attacks.

When a user requests a webpage, the CDN delivers the content from the nearest server to the user. As a result, the loading times are faster since the data has to travel a shorter distance. CDNs offer endless benefits like reduced bandwidth usage, scalability, increased reliability, and more. Some well-known CDNs include Cloudflare, Amazon CloudFront, Akamai, and Fastly. They offer several features that help reduce web page sizes and make websites run better.

Cloudflare

Cloudflare offers low/no markup domain name registration with a free DNS service. This will virtually always be your cheapest option for domain name renewals. They don't list prices for all TLDs upfront, so use this list to get your best estimate.

Our site used Cloudflare to handle all our DNS needs. Cloudfare has a number of rewrite options but as we needed to make a decision based on a) the URL path and b) rewriting to a specific domain, the only option (as a non enterprise customer) was to use Cloudflare workers (via worker routes).

Add Cloudflare Cahce & Protection

Cloudflare is a cloud-provider, most-known for their CDN, offering several services to build cloud applications. Among them, Cloudflare Workers is a serverless service that allows you to run serverless functions at edge (like Lambda@Edge if you are an AWS user). This means that your code runs closer to end-users, resulting in blazing fast response times.

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...