November 03, 2021 2:37 PM
It’s not every day that you get to debug what may well be a packet of death. It was certainly the first time for me. What do I mean by “a packet of death”? A software bug where the network stack crashes in reaction to a single received network packet, taking down the whole operating system with it. ...
September 14, 2021 12:59 PM
In this blog post, we’ll show you how we built a new system that can give you access to your Cloudflare logs in real time, with just a single click....
September 10, 2021 12:58 PM
Continue learning how to import and execute code from an object file. In this part we will handle external library dependencies....
August 26, 2021 3:04 PM
Using async Rust libraries is usually easy. It's just like using normal Rust code, with a little async or .await here and there. But writing your own async libraries can be hard. ...
May 06, 2021 1:00 PM
Is it ok to have if clauses that will basically never be run? Surely, there must be some performance cost to that......
March 02, 2021 12:00 PM
Ever wondered if it is possible to execute an object file without linking? Or use any object file as a library? Follow along to learn how to decompose an object file and import code from it along the way....
December 18, 2020 12:30 AM
On Wednesday, December 16, the RedDrip Team from QiAnXin Technology released their discoveries (tweet, github) regarding the random subdomains associated with the SUNBURST malware which was present in the SolarWinds Orion compromise. I...
November 27, 2020 1:00 PM
At Cloudflare, we pride ourselves in our global network that spans more than 200 cities in over 100 countries. To accelerate all that traffic through our network, there are multiple technologies at play. So let’s have a look at one of the cornerstones that makes all of this work....
October 27, 2020 12:00 PM
A few months ago, after reading about Cloudflare doubling its intern class, I quickly dusted off my CV and applied for an internship. Long story short: now, a couple of months later, I found myself staring at Linux kernel code and adding a pretty cool feature to gVisor....
October 12, 2020 1:00 PM
Today, we’re excited to share Cloudflare One™, our vision to tackle the intractable job of corporate security and networking. Run your network on Cloudflare and keep it secure....
September 15, 2020 11:00 AM
The goal of Cloudflare operated Secondary DNS is to allow our customers with custom DNS solutions, be it on-premise or some other DNS provider, to be able to take advantage of Cloudflare's DNS performance and more recently, through Secondary Override, our proxying and security ca...
September 09, 2020 11:00 AM
Unimog is the Layer 4 Load Balancer for Cloudflare’s edge data centers. This post explains the problems it solves and how it works....
July 08, 2020 11:00 AM
In this post we will review Linux seccomp and learn how to sandbox any (even a proprietary) application without writing a single line of code....
June 18, 2020 11:56 AM
My program received a SIGSEGV signal and crashed with "Segmentation Fault" message. Where does the "V" come from? Did I read it wrong? Was there a "Segmentation *V*ault?"? Or did Linux authors make a mistake? Shouldn't the signal be named SIGSEGF? ...
May 06, 2020 11:00 AM
This is the ongoing story of Bot Management at Cloudflare and also an introduction to a series of blog posts about the detection mechanisms powering it...
March 05, 2020 1:00 PM
On the 11th of January 1982 twenty-two computer scientists met to discuss an issue with ‘computer mail’ (now known as email). Attendees included the guy who would create Sun Microsystems, the guy who made Zork, the NTP guy, and the guy who convinced the government to pay for Unix...
March 02, 2020 1:00 PM
Last month finally I had an opportunity to use Bloom filters. I became fascinated with the promise of this data structure, but I quickly realized it had some drawbacks. This blog post is the tale of my brief love affair with Bloom filters....
December 05, 2019 7:28 AM
An exploration of building accessible color systems for flexible UI theming. ...
November 29, 2019 8:00 AM
The second blog post in the series on HTML rewriters picks up the story in 2017 after the launch of the Cloudflare edge compute platform Cloudflare Workers. It became clear that the developers using workers wanted the same HTML rewriting capabilities that we used internally, ...
