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PODCAST

Chaos Computer Club - recent events feed (low quality)

Der Chaos Computer Club ist die größte europäische Hackervereinigung, und seit über 25 Jahren Vermittler im Spannungsfeld technischer und sozialer Entwicklungen.

technology

All Episodes

00:39:39

A simpler and faster firewall with bpfilter (asg2025)

Chaos Computer Club - recent events feed (low quality) ·

2025/09/30

For many years, firewall solutions on Linux have grown and evolved, without any major change, until eBPF. While eBPF can allow very fast and efficient packet filtering, the learning curve doesn't make it easily accessible to non-developers. bpfilter aims to bridge the gap between existing tools (nftables, iptables) and modern technologies such as eBPF. By translating filtering rules into native code, bpfilter abstracts the complexity behind cutting-edge kernel technologies while maintaining

00:37:46

ParticleOS: Why is Lennart still not dogfooding...

Chaos Computer Club - recent events feed (low quality) ·

2025/09/30

More than six months have passed since Daan tried to ~~shame~~ gently peer pressure Lennart to actually use the stuff he builds, via a FOSDEM talk: https://fosdem.org/2025/schedule/event/fosdem-2025-4057-particleos-can-we-make-lennart-poettering-run-an-image-based-distribution-/ Did he succeed? Is dogfooding standard practice now in the systemd development process? Or do things like randomly breaking logging in GNOME (*cough*) still happen from time to time? Join us for this talk to find out, and

00:25:01

Sandboxing services with Landlock (asg2025)

Chaos Computer Club - recent events feed (low quality) ·

2025/09/30

Landlock is an unprivileged kernel feature that enables all Linux users to sandbox their processes. Complementary to seccomp, developers can leverage Landlock to restrict their programs in a fine-grained way. While Landlock can be used by end users through sandboxer tools, there is currently no well-integrated solution to define security policies tailored to system services. Although AppArmor and seccomp security policies can already be tied to a system unit, we aim to provide a more dynamic,

00:26:19

Integrating systemd-sysext images in an update stack...

Chaos Computer Club - recent events feed (low quality) ·

2025/09/30

systemd-sysext provides a nice way to enhance a distribution with a read-only root filesystem without the need to reboot. But there is additional tooling necessary to manage the sysext images: * install an image which is compatible with the installed OS version * update installed images to the newest compatible version * rollback images in case of an OS rollback * cleanup unneeded images In this presentation I will talk about which tooling systemd itself provides for this (importctl, updatectl,

00:27:35

Look ma, no secrets! - bootstrapping cryptographic...

Chaos Computer Club - recent events feed (low quality) ·

2025/09/30

All the big cloud providers provide your machines with a unique cryptographic identity that can be used to talk to their cloud services securely without having to manage or rotate any cryptographic secrets yourself. For example GCP has Service accounts and AWS has IAM roles. This ubiquity of cloud identity and the seamless integration with all the the services of these cloud providers is one of the reasons why they are so successful. SPIFFE (Secure Production Identity Framework For Everyone)

00:25:54

Extending Fedora Atomic Desktops using systemd system...

Chaos Computer Club - recent events feed (low quality) ·

2025/09/30

On image based desktops distributions such as Fedora Atomic desktops and Universal Blue, users are expected to run their graphical applications using Flatpaks and their command line ones using containers. But that approach does not work well for some applications that require more privileges, direct access to devices or kernel interfaces. With systemd system extensions (sysexts), it is possible to extend an image based system on demand. Sysexts come with a lot of advantages: they can be created out

00:26:12

Accessing shadow records via varlink (asg2025)

Chaos Computer Club - recent events feed (low quality) ·

2025/09/30

Provide a varlink service to access /etc/passwd and /etc/shadow so that no setuid and setgid binaries are necessary for this task. There are two independent "problems" which can be solved with the same idea: all files in /usr should be owned by root:root and no setuid binary should be needed. The first one is a requirement of image based updates of /usr to avoid UID/GID drift, the second one is a security feature wished by systemd developers and security teams. Currently most setuid binaries (or

00:25:45

systemd-confext Two Years On: Versioned Overlays for...

Chaos Computer Club - recent events feed (low quality) ·

2025/09/30

systemd-confext is a lightweight overlay mechanism for /etc, allowing you to drop in a configuration extension ("confext") bundle and let systemd make it visible to your service as though it was already shipped with the base image. Building on the same extension magic as systemd-sysext, confext also introduces extra features tailored for the /etc use case, such as vpick-ing the newest version and the ability to pick up config revisions with a `systemctl reload`. This talk presents the changes to

00:24:03

How I optimized away 94% CPU from zbus (asg2025)

Chaos Computer Club - recent events feed (low quality) ·

2025/09/30

Haven’t you ever wanted to find ways to make your Rust code the most optimal in the world? I know how you feel. This is a talk, where I’d tell you how easy it is to profile your Rust software and how most often the solutions are trivial. This is a story of how I used a few readily-available Open Source tools to achieve huge optimizations in [zbus](https://crates.io/crates/zbus), a pure Rust D-Bus library. This was long journey but gains were worth the efforts. I will go through each single

00:28:12

systemd: round table (asg2025)

Chaos Computer Club - recent events feed (low quality) ·

2025/09/30

Let's have an open discussion with systemd developers who are at ASG and users in the audience. We will open with the developers saying what they plan to work on in the near future, and then allow questions / comments from the audience. Licensed to the public under https://creativecommons.org/licenses/by/4.0/de/ about this event: https://cfp.all-systems-go.io/all-systems-go-2025/talk/PXZGEL/

00:21:47

systemd: state of the project (asg2025)

Chaos Computer Club - recent events feed (low quality) ·

2025/09/30

Same as every year, a lot has happened in the systemd project since last year's ASG. We released multiple versions, packed with new components and features. This talk will provide an overview of these changes, commenting on successes and challenges, and a sneak peak at what lies ahead. Licensed to the public under https://creativecommons.org/licenses/by/4.0/de/ about this event: https://cfp.all-systems-go.io/all-systems-go-2025/talk/B8RVCJ/

00:25:57

Linux IPC: Lost between Threading and Networking...

Chaos Computer Club - recent events feed (low quality) ·

2025/09/30

Communication is paramount in modern application development. This applies equally well to the process of writing applications and to the code itself. The complexity of the tasks ahead of us calls for a distributed and coordinated development effort, and this often manifests in our code: We design distributed, communicating systems to split complexity and responsibility among many people and teams, and at the same time meet the demand for ever faster systems. The last decade showed significantly

00:23:50

BPF Tokens in systemd (asg2025)

Chaos Computer Club - recent events feed (low quality) ·

2025/09/30

Running **BPF** programs today requires *CAP_BPF* capability, which is an all or nothing BPF capability. But BPF nowadays spans a large area, from simple monitoring to potentially invasive fields like network or tracing. BPF Tokens aims to add fine grained BPF capabilities to systemd units and containers, avoiding to give the whole *CAP_BPF* capability or even worse running the service as privileged

00:29:24

Systing: tracing for the lazy (asg2025)

Chaos Computer Club - recent events feed (low quality) ·

2025/09/30

Systing helps you solve problems in minutes rather than days. Out of the box it gives you everything you could possibly need, combined with perfetto’s visualization you will never be confused again. This talk will introduce systing, a tracer that is built on modern BPF tooling, purpose built to debug large applications with complicated interactions. This will be little talk and mostly demo. Two decades of experience debugging kernel problems has been poured into this tool to make it as

00:23:28

Why you should contribute to systemd! (asg2025)

Chaos Computer Club - recent events feed (low quality) ·

2025/09/30

I'll use these 20 minutes to explain why and why contributing to systemd is a great experience. We'll avoid beating dead horses by not discussing git forges and email, but instead focus on the development experience, from building systemd distribution packages from git main, running integration tests against those distribution packages, debugging failures, writing new tests, and installing the distribution packages on real hardware to debug issues. Licensed to the public under

00:21:20

Container Networking With Netkit: The BPF...

Chaos Computer Club - recent events feed (low quality) ·

2025/09/30

Introduced in kernel v6.7, the Netkit device is an eBPF-programmable network device designed with containers in mind. In this talk, I will go over the the basics of the Netkit device, and discuss the performance gains we have realized and challenges we faced when rolling out Netkit across millions of containers at Meta. Licensed to the public under https://creativecommons.org/licenses/by/4.0/de/ about this event: https://cfp.all-systems-go.io/all-systems-go-2025/talk/WAHYE8/

00:40:31

A Security Model for systemd (asg2025)

Chaos Computer Club - recent events feed (low quality) ·

2025/09/30

Linux lacks a coherent security model, and by extension we never defined one for the systemd project either. In this talk I'd like to start changing this, and begin defining some general security design guidelines that we so far mostly followed implicitly, and make them more explicit. After all, systemd to a large degree is involved in security subsystems, from SecureBoot, Measured Boot & TPM, to its service sandboxing, dm-verity/dm-crypt support, its FIDO2/PKCS#11 hookups, its many security

00:10:52

How to Quellcode (quellcode25)

Chaos Computer Club - recent events feed (low quality) ·

2025/09/28

Kurzer Talk, indem ich kurz vorstelle wie wir die Quellcode organisiert haben. https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://pretalx.0x90.space/quellcode-2/talk/QVGLUD/

00:17:18

Siemens Systemtelefon hacken for fun and giggles...

Chaos Computer Club - recent events feed (low quality) ·

2025/09/28

Im Hackspace sind Systemtelefone von Siemens aufgetaucht. Wir hatten sehr viel Spass mit ihnen und ich will davon erzählen. Zusammen mit zwei anderen Mitgliedern aus dem Nerdberg haben wir uns das "Unify OpenStage 60" Telefon angeschaut, Root-Zugriff bekommen und schlussendlich ein paar nette Anwendungen darauf zum laufen bekommen. Das ganze war aber eher eine längere Reise - von dieser will ich euch erzählen. https://creativecommons.org/licenses/by-sa/4.0/ about this event:

00:12:36

Lightning talks (quellcode25)

Chaos Computer Club - recent events feed (low quality) ·

2025/09/28

Lightning talk slot, to present some lightning talks. A slot for short talks about different topics, Can be in English or German. Ein Programm Punkt in dem kurze Vorträge über verschiedene Themen vorgetragen werden können. Die Vorträge können in Deutsch oder Englisch gehalten werden. https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://pretalx.0x90.space/quellcode-2/talk/RD9FHU/

4,333 results

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