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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.
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[$] Concurrency management in BPF

금, 2019/02/08 - 2:24오전
In the beginning, programs run on the in-kernel BPF virtual machine had no persistent internal state and no data that was shared with any other part of the system. The arrival of eBPF and, in particular, its maps functionality, has changed that situation, though, since a map can be shared between two or more BPF programs as well as with processes running in user space. That sharing naturally leads to concurrency problems, so the BPF developers have found themselves needing to add primitives to manage concurrency (the "exchange and add" or XADD instruction, for example). The next step is the addition of a spinlock mechanism to protect data structures, which has also led to some wider discussions on what the BPF memory model should look like.
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LSFMM 2019 gains a BPF track

금, 2019/02/08 - 1:19오전
The call for proposals for the 2019 Linux Storage, Filesystem, and Memory-Management Summit has been updated with an important addition: this year's event (April 30 to May 2, San Juan, Puerto Rico) will include a BPF track. The submission deadline has been extended to February 22 to allow BPF developers to put together their proposals.
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Security updates for Thursday

목, 2019/02/07 - 11:37오후
Security updates have been issued by Debian (curl, golang, libthrift-java, mumble, netmask, python3.4, and rssh), openSUSE (python-python-gnupg), Oracle (kernel), Scientific Linux (thunderbird), Slackware (curl), SUSE (firefox, python, and rmt-server), and Ubuntu (curl, libarchive, and libreoffice).
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[$] LWN.net Weekly Edition for February 7, 2019

목, 2019/02/07 - 10:15오전
The LWN.net Weekly Edition for February 7, 2019 is available.
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[$] Lisp and the foundations of computing

목, 2019/02/07 - 9:07오전

At the start of his linux.conf.au 2019 talk, Kristoffer Grönlund said that he would be taking attendees back 60 years or more. That is not quite to the dawn of computing history, but it is close—farther back than most of us were alive to remember. He encountered John McCarthy's famous Lisp paper [PDF] via Papers We Love and it led him to dig deeply into the Lisp world; he brought back a report for the LCA crowd.

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Lots of stable kernel updates

목, 2019/02/07 - 6:30오전
The 4.20.7, 4.19.20, 4.14.98, 4.9.155, 4.4.173, and 3.18.134 stable kernels have all been released. The usual drill applies: each contains a number of important fixes and upgrading is recommended.
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[$] Saving birds with technology

목, 2019/02/07 - 2:26오전

Two members of the Cacophony Project came to linux.conf.au 2019 to give an overview of what the project is doing to increase the amount of bird life in New Zealand. The idea is to use computer vision and machine learning to identify and eventually eliminate predators in order to help bird populations; one measure of success will be the volume and variety of bird song throughout the islands. The endemic avian species in New Zealand evolved without the presence of predatory mammals, so many of them have been decimated by the predation of birds and their eggs. The Cacophony Project is looking at ways to reverse that.

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Security updates for Wednesday

목, 2019/02/07 - 12:46오전
Security updates have been issued by Debian (dovecot and libav), openSUSE (kernel and krb5), Scientific Linux (thunderbird), SUSE (curl, lua53, python3, and spice), and Ubuntu (dovecot).
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[$] Mozilla's initiatives for non-creepy deep learning

목, 2019/02/07 - 12:13오전
Jack Moffitt started off his 2019 linux.conf.au talk by calling attention to Facebook's "Portal" device. It is, he said, a cool product, but raises an important question: why would anybody in their right mind put a surveillance device made by Facebook in their kitchen? There are a lot of devices out there — including the Portal — using deep-learning techniques; they offer useful functionality, but also bring a lot of problems. We as a community need to figure out a way to solve those problems; he was there to highlight a set of Mozilla projects working toward that goal.
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[$] Fixing page-cache side channels, second attempt

수, 2019/02/06 - 1:40오전
The kernel's page cache, which holds copies of data stored in filesystems, is crucial to the performance of the system as a whole. But, as has recently been demonstrated, it can also be exploited to learn about what other users in the system are doing and extract information that should be kept secret. In January, the behavior of the mincore() system call was changed in an attempt to close this vulnerability, but that solution was shown to break existing applications while not fully solving the problem. A better solution will have to wait for the 5.1 development cycle, but the shape of the proposed changes has started to come into focus.
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Security updates for Tuesday

수, 2019/02/06 - 1:02오전
Security updates have been issued by Debian (libgd2), Fedora (java-11-openjdk, kernel, and kernel-headers), openSUSE (firefox, mysql-community-server, and pdns-recursor), Oracle (thunderbird), Red Hat (rh-haproxy18-haproxy, systemd, and thunderbird), SUSE (haproxy, spice, and uriparser), and Ubuntu (dovecot, kernel, linux, linux-aws, linux-gcp, linux-kvm, linux-raspi2, linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon, linux-aws, linux-gcp, linux-kvm, linux-oem, linux-raspi2, linux-hwe, linux-aws-hwe, linux-gcp, linux-lts-trusty, and linux-lts-xenial, linux-aws).
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[$] Python elects a steering council

화, 2019/02/05 - 6:04오전

After a two-week voting period, which followed a two-week nomination window, Python now has its governance back in place—with a familiar name in the mix. As specified in PEP 13 ("Python Language Governance"), five nominees were elected to the steering council, which will govern the language moving forward. It may come as a surprise to some that Guido van Rossum, whose resignation as benevolent dictator for life (BDFL) led to the need for a new governance model and, ultimately, to the vote for a council, was one of the 17 candidates. It is perhaps much less surprising that he was elected to share the duties he once wielded solo.

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Results of the first Python Steering Council election

화, 2019/02/05 - 1:18오전
The governance model adopted by the Python community after Guido van Rossum stepped down included the election of a Steering Council. The first such election has just concluded; the council will be made up of Barry Warsaw, Brett Cannon, Carol Willing, Guido van Rossum, and Nick Coghlan.
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Security updates for Monday

화, 2019/02/05 - 12:59오전
Security updates have been issued by CentOS (bind, firefox, GNOME, kernel, systemd, and thunderbird), Debian (debian-security-support, drupal7, libreoffice, libvncserver, phpmyadmin, and rssh), Fedora (binutils and firefox), Mageia (firefox and netatalk), openSUSE (avahi and python-paramiko), Red Hat (Red Hat Gluster Storage Web Administration), Slackware (mariadb), and SUSE (java-11-openjdk, kernel, and python).
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Kernel prepatch 5.0-rc5

화, 2019/02/05 - 12:38오전
The 5.0-rc5 kernel prepatch is out. "Nothing looks particularly worrisome, so assuming the trend holds, we look to be on track for a fairly normal release cycle despite the early hiccups due to the holidays."
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