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LWN.net is a comprehensive source of news and opinions from and about the Linux community. This is the main LWN.net feed, listing all articles which are posted to the site front page.
Updated: 50 min 54 sec ago

[$] Rejuvenating Autoconf

13 hours 40 min ago
GNU Autoconf, a widely used build tool that shines at compatibility with a variety of Unixes, has accumulated many improvements since its last release in 2012 — and there are patches awaiting review. While many projects have switched to other build systems, interest in Autoconf remains. Now, a small team (disclaimer: including article author Sumana Harihareswara) is rejuvenating it, working through some deferred maintenance and code review. A testable beta is now out, a new stable release is due in early November, and interested parties can build on this momentum to further refresh the rest of the GNU Build System (also known as Autotools).

Security updates for Friday

13 hours 49 min ago
Security updates have been issued by Gentoo (freetype), openSUSE (mailman), Red Hat (firefox, java-11-openjdk, OpenShift Container Platform 3.11.306 jenkins, and rh-maven35-jackson-databind), SUSE (kernel, mercurial, openldap2, python-pip, and xen), and Ubuntu (firefox, netty-3.9, and python-pip).

Ubuntu 20.10 (Groovy Gorilla) released

Thursday 22nd of October 2020 06:50:55 PM
The Ubuntu 20.10 release is out. "The Ubuntu kernel has been updated to the 5.8 based Linux kernel, and our default toolchain has moved to gcc 10 with glibc 2.32. Additionally, there is now a desktop variant of the Raspberry Pi image for Raspberry Pi 4 4GB and 8GB. Ubuntu Desktop 20.10 introduces GNOME 3.38, the fastest release yet with significant performance improvements delivering a more responsive Experience". See the release notes for more details.

[$] Constant-action bitmaps for seccomp()

Thursday 22nd of October 2020 04:26:23 PM
The seccomp() system call allows user space to load one or more (classic) BPF programs to be run whenever the calling process invokes a system call. Those programs can examine (to an extent) the arguments to each call and inform the kernel whether the call should be allowed to proceed or not. This feature is used in a number of containerization solutions (and beyond) as a way of reducing the kernel's attack surface. In some situations, though, using seccomp() can result in a significant performance reduction. There are currently two patch sets in circulation that are aimed at reducing the overhead of seccomp() for one common use case.

Security updates for Thursday

Thursday 22nd of October 2020 04:13:40 PM
Security updates have been issued by Arch Linux (freetype2), Debian (bluez, firefox-esr, and freetype), Fedora (firefox), openSUSE (chromium), Oracle (kernel), Red Hat (java-11-openjdk), Slackware (kernel), SUSE (freetype2, gnutls, kernel, php7, and tomcat), and Ubuntu (flightgear, italc, libapache2-mod-auth-mellon, libetpan, and php-imagick).

[$] LWN.net Weekly Edition for October 22, 2020

Thursday 22nd of October 2020 03:01:12 AM
The LWN.net Weekly Edition for October 22, 2020 is available.

[$] What is coming in PHP 8

Wednesday 21st of October 2020 04:22:02 PM
Recently, PHP 8 release candidate 2 was posted by the project. A lot of changes are coming with this release, including a just-in-time compiler, a good number of backward-compatibility breaks, and new features that developers have been requesting for years. Now that the dust has settled, and the community is focusing on squashing bugs for the general-availability release scheduled for November 26, it's a good time to look at what to expect.

Security updates for Wednesday

Wednesday 21st of October 2020 02:50:03 PM
Security updates have been issued by Arch Linux (kdeconnect, kernel, kpmcore, lib32-freetype2, linux-hardened, linux-lts, linux-zen, lua, and powerdns-recursor), Debian (mariadb-10.1 and mariadb-10.3), Fedora (thunderbird), Mageia (claw-mail, freetype2, geary, kernel, and tigervnc), Oracle (nodejs:12), Red Hat (python27, rh-postgresql96-postgresql, and rh-python38), Slackware (freetype), SUSE (hunspell, kernel, libvirt, and taglib), and Ubuntu (grunt, quassel, and tomcat9).

Firefox 82.0 and ESR 78.4.0

Tuesday 20th of October 2020 05:33:09 PM
Firefox 82.0 has been released, with improvements "that make watching videos more delightful" and improved performance. Firefox ESR 78.4.0 is also available with various stability, functionality, and security fixes. See the release notes (82.0, 78.4.0) for details.

[$] The accelerating adoption of Julia

Tuesday 20th of October 2020 03:52:13 PM
The Julia programming language has seen a major increase in its use and popularity over the last few years. We last looked at it two years ago, around the time of the Julia 1.0 release. Here, we will look at some of the changes since that release, none of which are major, as well as some newer resources for learning the language, but the main focus of this article is a case study that is meant to help show why the language has been taking off. A follow-up article will introduce a new computational notebook for Julia, called Pluto, that is akin to Jupyter notebooks.

Security updates for Tuesday

Tuesday 20th of October 2020 02:54:23 PM
Security updates have been issued by Debian (python-flask-cors), Fedora (kleopatra, nextcloud, and phpMyAdmin), Gentoo (ark, libjpeg-turbo, libraw, and libxml2), openSUSE (bind, kernel, php7, and transfig), Red Hat (kernel, kernel-alt, kernel-rt, rh-python36, virt:8.1 and virt-devel:8.1, and virt:8.2 and virt-devel:8.2), and Ubuntu (collabtive, freetype, linux, linux-hwe, linux-hwe-5.4, linux-oem, linux-raspi, linux-raspi-5.4, linux-snapdragon, and linux-oem-osp1, linux-raspi2-5.3).

Combating abuse in Matrix - without backdoors (Matrix blog)

Tuesday 20th of October 2020 02:12:26 PM
This Matrix blog entry describes a planned reputation-management system that, it is claimed, accomplishes some of the same goals as government backdoors without the need to compromise end-to-end encryption. "Just like the Web, Email or the Internet as a whole, there is literally no way to unilaterally censor or block content in Matrix. But what we can do is provide first-class infrastructure to let users (and room/community moderators and server admins) make up their own mind about who to trust, and what content to allow. This would also provide a means for authorities to publish reputation data about illegal content, providing a privacy-respecting mechanism that admins/mods/users can use to keep illegal content away from their servers/clients."

Git v2.29.0 released

Monday 19th of October 2020 06:52:58 PM
Version 2.29.0 of the Git source-code management system is out. This release includes a long list of smallish improvements; click below for the details. Also present is the code enabling Git to switch to the SHA-256 hash algorithm; this feature is still deemed experimental, though, and interoperability with SHA-1 repositories is not yet available.

[$] Resource management in KDE

Monday 19th of October 2020 04:42:40 PM
Applications that run on the Linux desktop have changed significantly under the hood in recent years; for example, they use more processes than before. Desktop environments need to adapt to this change. During Akademy 2020, KDE developers David Edmundson and Henri Chain delivered a talk (YouTube video) about how KDE, working with other desktop environments, is starting to use advanced kernel features to give users more control over their systems. This talk complements a presentation by GNOME developers that was recently covered here.

Security updates for Monday

Monday 19th of October 2020 03:03:51 PM
Security updates have been issued by Debian (kernel, thunderbird, and yaws), Fedora (createrepo_c, dnf, dnf-plugins-core, dnf-plugins-extras, kata-agent, libdnf, librepo, and wireshark), Gentoo (chromium and firefox), Mageia (brotli, flash-player-plugin, php, phpmyadmin, and wireshark), openSUSE (crmsh, gcc10, nvptx-tools, icingaweb2, kernel, libproxy, pdns-recursor, phpMyAdmin, and rubygem-activesupport-5_1), Red Hat (nodejs:12 and rh-maven35-apache-commons-collections4), and SUSE (gcc10, nvptx-tools and transfig).

A set of weekend stable kernel updates

Saturday 17th of October 2020 03:27:20 PM
The 5.9.1, 5.8.16, 5.4.72, 4.19.152, 4.14.202, 4.9.240, and 4.4.240 stable updates have all been released; each contains another set of important fixes.

[$] 5.10 Merge window, part 1

Friday 16th of October 2020 03:48:57 PM
As of this writing, 7,153 non-merge changesets have been pulled into the mainline Git repository for the 5.10 release — over a period of four days. This development cycle is clearly off to a strong start. Read on for an overview of the significant changes merged thus far for the 5.10 kernel release.

Security updates for Friday

Friday 16th of October 2020 03:41:47 PM
Security updates have been issued by Fedora (dnf, kernel, libdnf, python27, and python34), SUSE (blktrace, crmsh, php7, and php72), and Ubuntu (containerd, docker.io, firefox, htmlunit, and newsbeuter).

linux.conf.au 2021 call for sessions and miniconfs

Thursday 15th of October 2020 09:39:19 PM
The 2021 edition of linux.conf.au will be held online on January 23-25, 2021; the call for proposals has gone out with a relatively tight deadline of November 6. "Our theme is 'So what's next?'. We all know we're living through unprecedented change and uncertain times. How can open source play a role in creating, helping and adapting to this ongoing change? What new developments in software and coding can we look forward to in 2021 and beyond?" Since there is no travel involved, this is a rare opportunity for those who have not normally been able to participate in LCA.

[$] The Arm64 memory tagging extension in Linux

Thursday 15th of October 2020 04:58:53 PM
One of the first features merged for the 5.10 kernel development cycle was support for the Arm v8.5 memory tagging extension [PDF]. By adding a "key" value to pointers, this mechanism enables the automated detection of a wide range of memory-safety issues. The result should be safer and more secure code — once support for the feature shows up in actual hardware.

More in Tux Machines

Devices/Embedded: Arduino and More

       
  • Arduino Blog » Driving a mini RC bumper car with a Nintendo Wii Balance Board

    Taking inspiration from Colin Furze’s 600cc bumper car constructed a few years ago, Henry Forsyth decided to build his own RC miniature version. His device features a 3D-printed and nicely-painted body, along with a laser-cut chassis that holds the electrical components. The vehicle is driven by a single gearmotor and a pair of 3D-printed wheels, with another caster-style wheel that’s turned left and right by a servo steering. An Arduino Uno and Bluetooth shield are used for overall control with a motor driver. The Bluetooth functionality allows for user interface via a PS4 controller, or even (after a bit of programming) a Wii Balance Board. In the end, the PS4 remote seems to be the better control option, but who knows where else this type of balance technique could be employed?

  • Intel Elkhart Lake COM’s offer up to 3x 2.5GbE, SIL2 functional safety
  • E3K all-in-one wireless bio-sensing platform supports EMG, ECG, and EEG sensors (Crowdfunding)

    Over the year, The maker community has designed several platforms to monitor vital signs with boards like Healthy Pi v4 or HeartyPatch both of which are powered by an ESP32 WiFi & Bluetooth wireless SoC. WallySci has designed another all-in-one wireless bio-sensing platform, called E3K, that also happens to be powered by Espressif Systems ESP32 chip, and can be connected to an electromyography (EMG) sensor to capture muscle movements, an electrocardiography (ECG) sensor to measure heart activity, and/or an electroencephalography (EEG) sensor to capture brain activity. The board also has an extra connector to connect a 9-axis IMU to capture motion.

  • Coffee Lake system can expand via M.2, mini-PCIe, PCIe, and Xpansion

    MiTac’s fanless, rugged “MX1-10FEP” embedded computer has an 8th or 9th Gen Coffee Lake Core or Xeon CPU plus 3x SATA bays, 4x USB 3.1 Gen 2, 2x M.2, 2x mini-PCIe, and optional PCIe x16 and x1. MiTac recently introduced a Coffee Lake based MX1-10FEP computer that is also being distributed by ICP Germany. This month, ICP announced that the MX1-10FEP-D model with PCIe x16 and PCIe x1 slots has been tested and classified by Nvidia as “NGC Ready” for Nvidia GPU Cloud graphics boards such as the Nvidia T4 and Tesla P4. [...] The MX1-10FEP has an Intel C246 chipset and defaults to Windows 10 with Linux on request.

Wine 5.20 Released

The Wine development release 5.20 is now available.

What's new in this release (see below for details):
  - More work on the DSS cryptographic provider.
  - A number of fixes for windowless RichEdit.
  - Support for FLS callbacks.
  - Window resizing in the new console host.
  - Various bug fixes.

The source is available from the following locations:

  https://dl.winehq.org/wine/source/5.x/wine-5.20.tar.xz
  http://mirrors.ibiblio.org/wine/source/5.x/wine-5.20.tar.xz

Binary packages for various distributions will be available from:

  https://www.winehq.org/download

You will find documentation on https://www.winehq.org/documentation

You can also get the current source directly from the git
repository. Check https://www.winehq.org/git for details.

Wine is available thanks to the work of many people. See the file
AUTHORS in the distribution for the complete list.
Read more Also: Wine 5.20 Released With Various Improvements For Running Windows Software On Linux

PostmarketOS update brings HDMI support for the PinePhone and PineTab

When the PinePhone postmarketOS Community Edition smartphone began shipping to customers in September it came with a version of the operating system with one important feature missing: HDMI output. So when my phone arrived a few weeks ago I was able to spend some time familiarizing myself with the operating system and I could plug in the included Convergence Dock to use USB accessories including a keyboard, mouse, and storage. But I wasn’t able to connect an external display. Now I can. Read more

today's howtos

  • How To Install Ubuntu 20.10 Groovy Gorilla

    This tutorial explains Ubuntu 20.10 Groovy Gorilla computer installation. You will prepare at least two disk partitions, finishing it all in about twenty minutes, and enjoy! Let's start right now.

  • How to install Ubuntu 20.10 - YouTube

    In this video, I am going to show how to install Ubuntu 20.10.

  • How To Install Webmin on Ubuntu 20.04 LTS - idroot

    In this tutorial we will show you how to install Webmin on Ubuntu 20.04 LTS, as well as some extra required packages by Webmin control panel

  • Running Ironic Standalone on RHEL | Adam Young’s Web Log

    This is only going to work if you have access to the OpenStack code. If you are not an OpenStack customer, you are going to need an evaluation entitlement. That is beyond the scope of this article.

  • Introduction to Ironic

    The sheer number of projects and problem domains covered by OpenStack was overwhelming. I never learned several of the other projects under the big tent. One project that is getting relevant to my day job is Ironic, the bare metal provisioning service. Here are my notes from spelunking the code.

  • Adding Nodes to Ironic

    TheJulia was kind enough to update the docs for Ironic to show me how to include IPMI information when creating nodes.

  • Secure NTP with NTS

    Many computers use the Network Time Protocol (NTP) to synchronize their system clocks over the internet. NTP is one of the few unsecured internet protocols still in common use. An attacker that can observe network traffic between a client and server can feed the client with bogus data and, depending on the client’s implementation and configuration, force it to set its system clock to any time and date. Some programs and services might not work if the client’s system clock is not accurate. For example, a web browser will not work correctly if the web servers’ certificates appear to be expired according to the client’s system clock. Use Network Time Security (NTS) to secure NTP. Fedora 331 is the first Fedora release to support NTS. NTS is a new authentication mechanism for NTP. It enables clients to verify that the packets they receive from the server have not been modified while in transit. The only thing an attacker can do when NTS is enabled is drop or delay packets. See RFC8915 for further details about NTS. NTP can be secured well with symmetric keys. Unfortunately, the server has to have a different key for each client and the keys have to be securely distributed. That might be practical with a private server on a local network, but it does not scale to a public server with millions of clients. NTS includes a Key Establishment (NTS-KE) protocol that automatically creates the encryption keys used between the server and its clients. It uses Transport Layer Security (TLS) on TCP port 4460. It is designed to scale to very large numbers of clients with a minimal impact on accuracy. The server does not need to keep any client-specific state. It provides clients with cookies, which are encrypted and contain the keys needed to authenticate the NTP packets. Privacy is one of the goals of NTS. The client gets a new cookie with each server response, so it doesn’t have to reuse cookies. This prevents passive observers from tracking clients migrating between networks.

  • Comfortable Motion: Absolutely Cursed Vim Scrolling - YouTube

    Have you ever felt like Vim was too useful and thought hey let's change that, well that's what this dev thought and now we have a plugin called comfortable motion that's adds physics based scrolling into vim, what's physics based scrolling you ask. Well it's scrolling that occurs based on how long you hold down the scroll key.

  • Running Cassandra on Fedora 32 | Adam Young’s Web Log

    This is not a tutorial. These are my running notes from getting Cassandra to run on Fedora 32. The debugging steps are interesting in their own right. I’ll provide a summary at the end for any sane enough not to read through the rest.

  • Recovering Audio off an Old Tape Using Audacity | Adam Young’s Web Log

    One of my fiorends wrote a bunch of music back in high school. The only remainig recordings are on a casette tape that he produced. Time has not been kind to the recordings, but they are audible…barely. He has a device that produces MP3s from the tape. My job has been to try and get them so that we can understand them well enough to recover the original songs. I have the combined recording on a single MP3. I’ve gone through and noted the times where each song starts and stops. I am going to go through the steps I’ve been using to go from that single long MP3 to an individual recording.

  • Role of Training and Certification at the Linux Foundation

    Open source allows anyone to dip their toes in the code, read up on the documentation, and learn everything on their own. That’s how most of us did it, but that’s just the first step. Those who want to have successful careers in building, maintaining, and managing IT infrastructures of companies need more structured hands-on learning with real-life experience. That’s where Linux Foundation’s Training and Certification unit enters the picture. It helps not only greenhorn developers but also members of the ecosystem who seek highly trained and certified engineers to manage their infrastructure. Swapnil Bhartiya sat down with Clyde Seepersad, SVP and GM of Training and Certification at the Linux Foundation, to learn more about the Foundation’s efforts to create a generation of qualified professionals.

  • Hetzner build machine

    This is part of a series of posts on compiling a custom version of Qt5 in order to develop for both amd64 and a Raspberry Pi. Building Qt5 takes a long time. The build server I was using had CPUs and RAM, but was very slow on I/O. I was very frustrated by that, and I started evaluating alternatives. I ended up setting up scripts to automatically provision a throwaway cloud server at Hetzner.