Language Selection

English French German Italian Portuguese Spanish

Kernel Security and Graphics

Submitted by Roy Schestowitz on Thursday 23rd of July 2020 11:52:02 PM Filed under
Graphics/Benchmarks
Linux
Security

  • The Seccomp Notifier – New Frontiers in Unprivileged Container Development

    That (Linux) Containers are a userspace fiction is a well-known dictum nowadays. It simply expresses the fact that there is no container kernel object in the Linux kernel. Instead, userspace is relatively free to define what a container is. But for the most part userspace agrees that a container is somehow concerned with isolating a task or a task tree from the host system. This is achieved by combining a multitude of Linux kernel features. One of the better known kernel features that is used to build containers are namespaces. The number of namespaces the kernel supports has grown over time and we are currently at eight.

    [...]

    So from the section above it should be clear that seccomp provides a few desirable properties that make it a natural candiate to look at to help solve our mknod(2) and mount(2) problem. Since seccomp intercepts syscalls early in the syscall path it already gives us a hook into the syscall path of a given task. What is missing though is a way to bring another task such as the LXD container manager into the picture. Somehow we need to modify seccomp in a way that makes it possible for a container manager to not just be informed when a task inside the container performs a syscall it wants to be informed about but also how to make it possible to block the task until the container manager instructs the kernel to allow it to proceed.

  • FGKASLR Revved For Improving Linux Kernel Security

    Intel open-source developer Kristen Carlson Accardi continues work on Function Granular Kernel Address Space Layout Randomization (FGKASLR) as a big improvement over traditional KASLR address space layout randomization.

    FGKASLR was originally published earlier this year, 15 years after the debut of KASLR for randomizing the base address of the running kernel. With FGKASLR, individual kernel functions are reordered so that even if the kernel's randomized based address is revealed, an attacker still wouldn't know the location in memory of particular kernel functions as the relative addresses will be different.

  • AMDVLK 2020.Q3.2 Radeon Vulkan Driver Christened Early Due To Bugs

    While it was just two days ago that AMDVLK 2020.Q3.1 debuted and normally there is a two to three week release cadence for these open-source AMD Radeon Vulkan driver code drops, this morning was already met by the debut of AMDVLK 2020.Q3.2.

    This expedited AMDVLK 2020.Q3.2 release is coming principally due to a few bugs. AMDVLK 2020.Q3.2 has changed its preference around Y-coordinate swizzle modes for 3D color attachments with GFX10/Navi, restricts its pipeline cache flush optimization to only cases where it's certainly legal behavior, updating against the Vulkan API 1.2.146 headers, and extends its "defer reusing command stream chunk concept" to all scenarios. There is also fixes for a shared metadata bug on GFX6 (Southern Islands) and fixing of some 999e5 format failures.

  • Mike Blumenkrantz: Partial Writes

    It’s a very slow day, and I awoke at 4:30 with the burning need to finish tessellation shaders. Or maybe I was just burning because it’s so hot out.

    In either case, I had a couple remaining tests that were failing, and, upon closer inspection and a lot of squinting, I determined that the problem was the use of partial writes to patch output variables in tessellation control shaders.

    With this knowledge in hand, I set about resolving the issue in the most bulldozer way possible, with no regard for how much of the code would survive once I discovered which nir pass I probably wanted to be running instead.

»

More in Tux Machines

digiKam 7.7.0 is released

After three months of active maintenance and another bug triage, the digiKam team is proud to present version 7.7.0 of its open source digital photo manager. See below the list of most important features coming with this release. Read more

Dilution and Misuse of the "Linux" Brand

Samsung, Red Hat to Work on Linux Drivers for Future Tech

The metaverse is expected to uproot system design as we know it, and Samsung is one of many hardware vendors re-imagining data center infrastructure in preparation for a parallel 3D world. Samsung is working on new memory technologies that provide faster bandwidth inside hardware for data to travel between CPUs, storage and other computing resources. The company also announced it was partnering with Red Hat to ensure these technologies have Linux compatibility. Read more

today's howtos

  • How to install go1.19beta on Ubuntu 22.04 – NextGenTips

    In this tutorial, we are going to explore how to install go on Ubuntu 22.04 Golang is an open-source programming language that is easy to learn and use. It is built-in concurrency and has a robust standard library. It is reliable, builds fast, and efficient software that scales fast. Its concurrency mechanisms make it easy to write programs that get the most out of multicore and networked machines, while its novel-type systems enable flexible and modular program constructions. Go compiles quickly to machine code and has the convenience of garbage collection and the power of run-time reflection. In this guide, we are going to learn how to install golang 1.19beta on Ubuntu 22.04. Go 1.19beta1 is not yet released. There is so much work in progress with all the documentation.

  • molecule test: failed to connect to bus in systemd container - openQA bites

    Ansible Molecule is a project to help you test your ansible roles. I’m using molecule for automatically testing the ansible roles of geekoops.

  • How To Install MongoDB on AlmaLinux 9 - idroot

    In this tutorial, we will show you how to install MongoDB on AlmaLinux 9. For those of you who didn’t know, MongoDB is a high-performance, highly scalable document-oriented NoSQL database. Unlike in SQL databases where data is stored in rows and columns inside tables, in MongoDB, data is structured in JSON-like format inside records which are referred to as documents. The open-source attribute of MongoDB as a database software makes it an ideal candidate for almost any database-related project. This article assumes you have at least basic knowledge of Linux, know how to use the shell, and most importantly, you host your site on your own VPS. The installation is quite simple and assumes you are running in the root account, if not you may need to add ‘sudo‘ to the commands to get root privileges. I will show you the step-by-step installation of the MongoDB NoSQL database on AlmaLinux 9. You can follow the same instructions for CentOS and Rocky Linux.

  • An introduction (and how-to) to Plugin Loader for the Steam Deck. - Invidious
  • Self-host a Ghost Blog With Traefik

    Ghost is a very popular open-source content management system. Started as an alternative to WordPress and it went on to become an alternative to Substack by focusing on membership and newsletter. The creators of Ghost offer managed Pro hosting but it may not fit everyone's budget. Alternatively, you can self-host it on your own cloud servers. On Linux handbook, we already have a guide on deploying Ghost with Docker in a reverse proxy setup. Instead of Ngnix reverse proxy, you can also use another software called Traefik with Docker. It is a popular open-source cloud-native application proxy, API Gateway, Edge-router, and more. I use Traefik to secure my websites using an SSL certificate obtained from Let's Encrypt. Once deployed, Traefik can automatically manage your certificates and their renewals. In this tutorial, I'll share the necessary steps for deploying a Ghost blog with Docker and Traefik.

More on Tux Machines: About ● Gallery ● Forum ● Blogs ● Search ● News ● RSS Feed

Part of Bytes Media ● Sister sites below.

TechBytes Techrights button

Powered by Drupal, an open source content management system

Content available under CC-BY-SA CC

© by original authors

Powered by CentOS 6.5 (GNU/Linux), Varnish, and Drupal 6