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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: 2 hours 37 min ago

[$] 5.3 Merge window, part 2

Monday 22nd of July 2019 04:06:39 PM
At the end of the 5.3 merge window, 12,608 non-merge changesets had been pulled into the mainline repository. Nearly 6,000 of those were pulled after the first-half summary was written. As expected, there was still a lot of material yet to be merged for this development cycle.

Security updates for Monday

Monday 22nd of July 2019 02:40:54 PM
Security updates have been issued by Debian (bind9, exiv2, kernel, nss, openjdk-11, openjdk-8, patch, and squid3), Fedora (gvfs, libldb, and samba), Mageia (firefox, gvfs, libreswan, rdesktop, and thunderbird), openSUSE (bzip2, clementine, dbus-1, expat, fence-agents, firefox, glib2, kernel, kernel-firmware, ledger, libqb, libu2f-host, pam_u2f, libvirt, neovim, php7, postgresql10, python-requests, python-Twisted, ruby-bundled-gems-rpmhelper, ruby2.5, samba, webkit2gtk3, zeromq, and znc), Red Hat (java-1.8.0-openjdk, java-11-openjdk, rh-maven35-jackson-databind, rh-nodejs8-nodejs, and rh-redis5-redis), Slackware (kernel), and SUSE (ucode-intel).

Kernel prepatch 5.3-rc1

Sunday 21st of July 2019 09:40:49 PM
Linus has released 5.3-rc1 and closed the merge window for this development cycle. "Anyway, despite the rocky start, and the big size, things mostly smoothed out towards the end of the merge window. And there's a lot to like in 5.3".

A crop of weekend stable kernel updates

Sunday 21st of July 2019 04:01:41 PM
Greg Kroah-Hartman has announced the release of the 5.2.2, 5.1.19, 4.19.60, 4.14.134, 4.9.186, and 4.4.186 stable kernels. As usual, they contain fixes throughout the kernel tree; users should upgrade.

[$] Improving communities through documentation

Friday 19th of July 2019 05:10:37 PM
Documentation, said Riona MacNamara at the beginning of her Open Source Summit Japan 2019 talk, is the superpower that we can use to energize users and developers; it is an important part of the creation of a vibrant and inclusive community. While there are a number of roadblocks that can impede participation in a development community, many of those can be addressed with better documentation. The talk was a call for all projects to think about what they are trying to accomplish and to ensure that their documentation is helping to get there.

Security updates for Friday

Friday 19th of July 2019 01:43:58 PM
Security updates have been issued by Debian (bzip2), Fedora (freetds, kernel, kernel-headers, and knot-resolver), openSUSE (bubblewrap, fence-agents, kernel, libqb, libu2f-host, pam_u2f, and tomcat), Oracle (vim), SUSE (kernel, LibreOffice, libxml2, and tomcat), and Ubuntu (libmspack and squid, squid3).

Cook: security things in Linux v5.2

Thursday 18th of July 2019 08:30:49 PM
Over on his blog, Kees Cook runs through the security changes that came in Linux 5.2. "While the SLUB and SLAB allocator freelists have been randomized for a while now, the overarching page allocator itself wasn't. This meant that anything doing allocation outside of the kmem_cache/kmalloc() would have deterministic placement in memory. This is bad both for security and for some cache management cases. Dan Williams implemented this randomization under CONFIG_SHUFFLE_PAGE_ALLOCATOR now, which provides additional uncertainty to memory layouts, though at a rather low granularity of 4MB (see SHUFFLE_ORDER). Also note that this feature needs to be enabled at boot time with page_alloc.shuffle=1 unless you have direct-mapped memory-side-cache (you can check the state at /sys/module/page_alloc/parameters/shuffle)."

[$] Kernel analysis with bpftrace

Thursday 18th of July 2019 06:35:03 PM
At the 2019 Linux Storage, Filesystem, and Memory-Management Summit (LSFMM) Brendan Gregg gave a keynote on BPF observability that included a kernel issue he had debugged on Netflix production servers using bpftrace. In this article, he provides a crash course on bpftrace for kernel developers—to help them more easily analyze their code.

Subscribers can read on for a look at kernel analysis using bpftrace from the upcoming weekly edition.

Security updates for Thursday

Thursday 18th of July 2019 01:45:55 PM
Security updates have been issued by Arch Linux (chromium, firefox, and squid), CentOS (thunderbird and vim), Debian (libonig), SUSE (firefox, glibc, kernel, libxslt, and tomcat), and Ubuntu (libreoffice and thunderbird).

[$] LWN.net Weekly Edition for July 18, 2019

Thursday 18th of July 2019 12:14:31 AM
The LWN.net Weekly Edition for July 18, 2019 is available.

[$] What's coming in Python 3.8

Wednesday 17th of July 2019 05:44:14 PM
The Python 3.8 beta cycle is already underway, with Python 3.8.0b1 released on June 4, followed by the second beta on July 4. That means that Python 3.8 is feature complete at this point, which makes it a good time to see what will be part of it when the final release is made. That is currently scheduled for October, so users don't have that long to wait to start using those new features.

[$] Fedora, GNOME Software, and snap

Wednesday 17th of July 2019 03:10:51 PM
A question about the future of package distribution is at the heart of a disagreement about the snap plugin for the GNOME Software application in Fedora. In a Fedora devel mailing list thread, Richard Hughes raised multiple issues about the plugin and the direction that he sees Canonical taking with snaps for Ubuntu. He plans to remove support for the plugin for GNOME Software in Fedora 31.

Security updates for Wednesday

Wednesday 17th of July 2019 02:45:26 PM
Security updates have been issued by Debian (libreoffice), Red Hat (thunderbird), SUSE (ardana and crowbar, firefox, libgcrypt, and xrdp), and Ubuntu (nss, squid3, and wavpack).

Security updates for Tuesday

Tuesday 16th of July 2019 02:54:14 PM
Security updates have been issued by Fedora (expat and radare2), Oracle (thunderbird), Red Hat (389-ds-base, keepalived, libssh2, perl, and vim), Scientific Linux (thunderbird), SUSE (bzip2, kernel, podofo, systemd, webkit2gtk3, and xrdp), and Ubuntu (bash, nss, redis, squid, squid3, and Zipios).

LXD 3.15 released

Monday 15th of July 2019 03:22:14 PM
The LXD team has announced the release of LXD 3.15. "One big highlight is the transition to the dqlite 1.0 branch which will bring us more performance and reliability, both for our cluster users and for standalone installations. This rework moves a lot of the low-level database/replication logic to dedicated C libraries and significantly reduces the amount of back and forth going on between C and Go."

[$] Who's afraid of a big bad optimizing compiler?

Monday 15th of July 2019 03:10:05 PM
Our increasingly aggressive modern compilers produce increasingly surprising code optimizations. Some of these optimizations might be especially surprising to developers who assume that each plain C-language load or store will always result in an assembly-language load or store. Although this article is written for Linux kernel developers, many of these scenarios also apply to other concurrent code bases, keeping in mind that "concurrent code bases" also includes single-threaded code bases that use interrupts or signals.

Security updates for Monday

Monday 15th of July 2019 02:57:15 PM
Security updates have been issued by CentOS (firefox), Debian (libspring-java, ruby-mini-magick, and thunderbird), Fedora (fossil, python-django, snapd-glib, and thunderbird), openSUSE (helm and monitoring-plugins), Red Hat (cyrus-imapd, thunderbird, and vim), Scientific Linux (vim), Slackware (bzip2), SUSE (bubblewrap, bzip2, expat, glib2, kernel, php7, python3, and tomcat), and Ubuntu (exiv2, firefox, and flightcrew).

Three new stable kernels

Sunday 14th of July 2019 09:54:53 PM
Greg Kroah-Hartman has announced the release of the 5.2.1, 5.1.18, and 4.19.59 stable kernels. As is usual, they contain important fixes throughout the tree; users of those series should upgrade.

[$] 5.3 Merge window, part 1

Friday 12th of July 2019 08:51:26 PM
As of this writing, exactly 6,666 non-merge changesets have been pulled into the mainline repository for the 5.3 development cycle. The merge window has thus just begun, there is still quite a bit in the way of interesting changes to look at. Read on for a list of what has been merged so far.

What is Silverblue? (Fedora Magazine)

Friday 12th of July 2019 05:45:15 PM
Fedora Magazine has posted an introduction to the Silverblue distribution. "One of the main benefits is security. The base operating system is mounted as read-only, and thus cannot be modified by malicious software. The only way to alter the system is through the rpm-ostree utility. Another benefit is robustness. It’s nearly impossible for a regular user to get the OS to the state when it doesn’t boot or doesn’t work properly after accidentally or unintentionally removing some system library."

More in Tux Machines

Save Web Pages As Single HTML Files For Offline Use With Monolith (Console)

Monolith is a command line tool to save any web page as a single HTML file that contains everything needed to render web page locally, without needing a working Internet connection. Use this to save web pages containing documentation, wiki articles, and anything else that interests you, for local/offline use. Since the web pages are saved in plain HTML, use a tool that can search in files to quickly find the web page you're looking for. Unlike the regular "Save page as" (or Ctrl + s) option provided by web browsers to save web pages to your computer, which saves web page assets in a folder next to the saved web page, this command line tool retrieves the web page assets and converts them into base64 data URLs, using that in the document instead of the regular URLs. As a result, page assets like Javascript, CSS or images are embedded in the page HTML, so all you need is a web browser to access the locally saved web page. Read more

Welcome to the August 2019 Friends of GNOME Update!

Neil, Molly, and Rosanna went to OSCON, in Portland, OR. While there, we met with people from other free software projects and companies developing open source, or with open source programs offices. Following OSCON, there was the West Coast Hackfest, during which the Documentation, GTK, and Engagement teams met and got a bunch of work done. There are some photos you can check out on our Twitter account. Molly attended FrOSCon, giving a keynote entitled “Open Source Citizenship for Everyone!” On September 17th, Molly will be at GitLab Commit in Brooklyn, NY. Federico Mena will be at CCOSS in Guadalajara, México, September 14 – 15th. There he will run a workshop on GNOME and deliver a keynote presentation. Read more

Cryptocurrency OS Makes It Easy to Buy and Spend Digital Cash

Cryptocurrency OS is a specialty Linux distribution that serves a niche user market destined to grow as the crypto economy continues to develop. This distro is packed with all the tools you need to create and manage your crypto accounts. It also is a fully functional Linux operating system. It is easy to use this distro as your daily computing platform. Read more

today's leftovers

  • Voyager Live 10 overview | The spirit of open source in the heart of the digital world

    In this video, I am going to show an overview of Voyager Live 10 and some of the applications pre-installed.

  • Cantor and the support for Jupyter notebooks at the finish line

    Hello everyone! It's been almost three weeks since my last post and this is going to be my my final post in this blog. So, I want to summarize all my work done in this GSoC project. Just to remember again, the goal of the project was to add the support for Jupiter notebooks to Cantor. This format is widely used in the scientific and education areas, mostly by the application Jupyter, and there is a lot of content available on the internet in this format (for example, here). By adding the support of this format in Cantor we’ll allow Cantor users access this content. This is short description, if you more intersted, you can found more details in my proporsal. [...] This is all for the limitations, I think. Let's talk about future plans and perspectives. In my opinion, this project has reached its initial goals, is finished now and will only need maintenance and support in terms of bug fixing and adjustment to potential format changes in future. When talking more generally, this project is part of the current overall development activities in Cantor to improve the usability and the stability of the application and to extend the feature set in order to enable more workflows and to reach to a bigger audience with this. See 19.08 and 18.12 release announcements to read more about the developments in the recent releases of Cantor. Support of the Jupyter notebook format is a big step into this direction but this not all. We have already many other items in our backlog like for the UX improvements, plots integration improvements going into this direction. Some of this items will be addressed soon. Some of them are something for the next GSoC project next year maybe? I think, that's all for now. Thank you for reading this blog and thank you for your interest in my project. Working on this project was a very interesting and pleasant period of my life. I am happy that I had this opportunity and was able to contribute to KDE and especially to Cantor with the support of my mentor Alexander Semke.

  • My Open-Source Activities from January to August 2019

    Debian is a general-purpose Linux distribution that is widely used on the planet. I am a Debian Developer who works on packages related to Android SDK and the Java ecosystem. I started a new package in an attempt to build the Android framework android.jar using the upstream build systems involving Ninja, Soong and others. Since the beginning we have been writing our own (very simple) makefiles to build the binaries in AOSP because their build logic tends to be simple and straightforward, until we worked on android.jar. Building it requires digging in so much code that it became incredibly hard to maintain, which is why we still haven’t brought in any newer version since android-framework-23. This is problematic as developers can’t build any apps that target Android 7+. After a month of work, this package is finally done. After all its dependencies are packaged in the future, it will be good to upload. This is where the students of Google Summer of Code (GSoC) come in!

  • iMars Black is an Inexpensive Bluetooth 5.0 USB Audio Transmitter & Receiver
  • This Linux computer plus router is the size of a ring box

    The VoCore2 Mini Linux Computer packs a wireless router and 16M of onboard storage into a cube about the size of a coin. Just hook it up to any display monitor through a standard USB2.0 port, and you're ready to put it to work. With 128MB of DDR2 memory and an MT7628AN MIPS processor, it's equally useful as a streaming station, VPN gateway, data storage - you name it.

  • Dive into the life and legacy of Alan Turing: 5 books and more

    Another well-known fact about Turing was his conviction for "gross indecency" because of his homosexuality, and the posthumous apology and pardon issued over more a half a decade after Turing’s death. But beyond all of this, who was Alan Turing? Here are six books that delve deeply into the life and legacy of Alan Turing. Collectively, these books cover his life, both professional and personal, and work others have done to build upon Turing’s ideas. Individually, or collectively, these works allow the reader to learn who Alan Turing was beyond just a few well-known, broad-stroke themes.

  • Security updates for Friday

    Security updates have been issued by Debian (cups, nginx, and openjdk-7), Fedora (httpd, mod_md, nghttp2, and patch), and SUSE (rubygem-loofah).

  • Epyc Encryption | TechSNAP 410

    It's CPU release season and we get excited about AMD's new line of server chips. Plus our take on AMD's approach to memory encryption, and our struggle to make sense of Intel's Comet Lake line. Also, a few Windows worms you should know about, the end of the road for EV certs, and an embarrassing new Bluetooth attack.