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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.
업데이트: 20분 51초 지남

Walleij: ARM32 page tables

화, 2020/10/27 - 1:06오전
Linus Walleij continues his series of blog posts on the 32-bit Arm kernel with this detailed description about how page tables work. "The Linux kernel will act as if 5 levels of page tables exist. This is of course grossly over-engineered for ARM32 which has 2 or 3 levels of page tables, but we need to cater for the rest of the world. One size fits all. In practice, the code is organized such that these page tables 'fold' and we mostly skip over the intermediate translation steps when possible."

[$] The rest of the 5.10 merge window

화, 2020/10/27 - 12:11오전
Linus Torvalds released 5.10-rc1 and closed the 5.10 merge window on October 25; by that time, 13,903 non-merge changesets had been pulled into the mainline repository. Of those, over 6,700 were merged since LWN's summary of the first half of the merge window. A fair number of interesting features found their way into the kernel among those commits; read on to catch up with what's coming in 5.10.

Security updates for Monday

월, 2020/10/26 - 11:53오후
Security updates have been issued by Debian (fastd, freetype, openjdk-11, phpmyadmin, and thunderbird), Fedora (ant, firefox, freetype, kde-partitionmanager, kpmcore, mupdf, python-PyMuPDF, singularity, suricata, and zathura-pdf-mupdf), Mageia (claws-mail, nss, firefox, pdns-recursor, and thunderbird), openSUSE (atftp, chromium, firefox, freetype2, gnutls, hunspell, kleopatra, and opera), Oracle (firefox, java-11-openjdk, and kernel), Red Hat (firefox and kpatch-patch), SUSE (bluez, firefox, glibc, libcdio, rmt-server, and SDL), and Ubuntu (freetype, pam-python, and perl).

Kernel prepatch 5.10-rc1

월, 2020/10/26 - 12:11오후
Linus has released 5.10-rc1 and closed the merge window for this development cycle. "This looks to be a bigger release than I expected, and while the merge window is smaller than the one for 5.8 was, it's not a *lot* smaller. And 5.8 was our biggest release ever."

GDB 10.1 released

일, 2020/10/25 - 1:34오전
Version 10.1 of the GDB debugger is out. Changes include support for debugging BPF programs, GDBserver support on the RISC-V architecture, and support for "debuginfod", which is "an HTTP server for distributing ELF/DWARF debugging information as well as source code."

[$] Rejuvenating Autoconf

토, 2020/10/24 - 1:08오전
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

토, 2020/10/24 - 12:59오전
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

금, 2020/10/23 - 3:50오전
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()

금, 2020/10/23 - 1:26오전
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

금, 2020/10/23 - 1:13오전
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

목, 2020/10/22 - 12:01오후
The LWN.net Weekly Edition for October 22, 2020 is available.

[$] What is coming in PHP 8

목, 2020/10/22 - 1:22오전
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

수, 2020/10/21 - 11:50오후
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

수, 2020/10/21 - 2:33오전
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

수, 2020/10/21 - 12:52오전
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

화, 2020/10/20 - 11:54오후
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)

화, 2020/10/20 - 11:12오후
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

화, 2020/10/20 - 3:52오전
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

화, 2020/10/20 - 1:42오전
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

화, 2020/10/20 - 12:03오전
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).