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Hier — 27 septembre 2021LWN

[$] The 2021 Kernel Maintainers Summit

27 septembre 2021 à 19:19
Par : corbet
The Kernel Maintainers Summit is an invitation-only gathering of top-level kernel subsystem maintainers; it is concerned mostly with process-oriented issues that are not easily worked out on the mailing lists. There was no maintainers summit in 2020; plans had been made to hold it in an electronic form, but there turned out to be a lack of things to talk about. In 2021, though, a number of interesting topics turned up, so an online gathering was held on September 24 as part of the Linux Plumbers Conference.

Read on for a summary of the discussions held at this year's Summit.

Security updates for Monday

27 septembre 2021 à 16:22
Par : ris
Security updates have been issued by Debian (kernel, libxml-security-java, and openssl), Fedora (fetchmail and python-rsa), openSUSE (grafana-piechart-panel and opera), and Red Hat (nodejs:14).

Kernel prepatch 5.15-rc3

27 septembre 2021 à 01:03
Par : corbet
The third 5.15 kernel prepatch is out for testing. "So after a somewhat rocky merge window and second rc, things are now actually looking pretty normal for rc3. Knock wood".
À partir d’avant-hierLWN

Weekend stable kernel updates

26 septembre 2021 à 21:04
Par : corbet
The 5.14.8, 5.10.69, 5.4.149, 4.19.208, 4.14.248, 4.9.284, and 4.4.285 stable kernels have all been released; each contains another set of important fixes.

Results from the 2021 Linux Foundation Technical Advisory Board election

24 septembre 2021 à 21:55
Par : corbet
The 2021 election for the Linux Foundation's Technical Advisory board resulted in all five incumbent members (Greg Kroah-Hartman, Jonathan Corbet, Steven Rostedt, Ted Ts'o, and Sasha Levin) being re-elected. Of the 1,012 developers authorized to vote, 237 actually cast ballots.

[$] Two security improvements for GCC

24 septembre 2021 à 19:04
Par : corbet
It has often been said that the competition between the GCC and LLVM compilers is good for both of them. One place where that competition shows up is in the area of security features; if one compiler adds a way to harden programs, the other is likely to follow suit. Qing Zhao's session at the 2021 Linux Plumbers Conference told the story of how GCC successfully played catch-up for two security-related features that were of special interest to the kernel community.

coreutils-9.0 released

24 septembre 2021 à 17:49
Par : jake
The GNU Core Utilities (coreutils) has announced the release of version 9.0 of "the basic file, shell and text manipulation utilities" used by the GNU operating system and various Linux distributions. In the year and a half or so since the last major release (8.32), various new features were added, including:
cp has changed how it handles data
  • enables CoW [copy on write] by default (through FICLONE ioctl),
  • uses copy offload where available (through copy_file_range),
  • detects holes differently (though SEEK_HOLE)
  • This also applies to mv and install.

Security updates for Friday

24 septembre 2021 à 16:17
Par : jake
Security updates have been issued by Debian (mupdf), Fedora (ghostscript, gifsicle, and ntfs-3g), openSUSE (kernel and nodejs14), and SUSE (curl, ffmpeg, gd, hivex, kernel, nodejs14, python-reportlab, sqlite3, and xen).

Poettering: Authenticated Boot and Disk Encryption on Linux

23 septembre 2021 à 17:35
Par : corbet
Here's a lengthy missive from Lennart Poettering taking Linux distributors to task for inadequately protecting systems from physical attacks.

So, does the scheme so far implemented by generic Linux distributions protect us against the latter two scenarios? Unfortunately not at all. Because distributions set up disk encryption the way they do, and only bind it to a user password, an attacker can easily duplicate the disk, and then attempt to brute force your password. What's worse: since code authentication ends at the kernel — and the initrd is not authenticated anymore —, backdooring is trivially easy: an attacker can change the initrd any way they want, without having to fight any kind of protections.

The article contains a lot of suggestions for how to do things better.

[$] Improvements to GCC's -fanalyzer option

23 septembre 2021 à 17:11
Par : corbet
For the second year in a row, the GNU Tools Cauldron (the annual gathering of GNU toolchain developers) has been held as a dedicated track at the online Linux Plumbers Conference. For the 2021 event, that track started with a talk by David Malcolm on his work with the GCC -fanalyzer option, which provides access to a number of static-analysis features. Quite a bit has been happening with -fanalyzer and more is on the way with the upcoming GCC 12 release, including, possibly, a set of checks that have already found at least one vulnerability in the kernel.

Security updates for Thursday

23 septembre 2021 à 16:38
Par : jake
Security updates have been issued by Debian (ruby-kaminari and tomcat8), Mageia (389-ds-base, ansible, apache, apr, cpio, curl, firefox, ghostscript, gifsicle, gpac, libarchive, libgd, libssh, lynx, nextcloud-client, openssl, postgresql, proftpd, python3, thunderbird, tor, and vim), openSUSE (chromium, ffmpeg, grilo, hivex, linuxptp, and samba), Oracle (go-toolset:ol8, kernel, kernel-container, krb5, mysql:8.0, and nodejs:12), SUSE (ffmpeg, firefox, grilo, hivex, kernel, linuxptp, nodejs14, and samba), and Ubuntu (ca-certificates, edk2, sqlparse, and webkit2gtk).

[$] LWN.net Weekly Edition for September 23, 2021

23 septembre 2021 à 02:35
Par : corbet
The LWN.net Weekly Edition for September 23, 2021 is available.

Courtès: What's in a package

22 septembre 2021 à 22:21
Par : jake
Over at the Guix-HPC blog, Ludovic Courtès writes about trying to package the PyTorch machine-learning library for the Guix distribution. Building from source in a user-verifiable manner is part of the philosophy behind Guix, but there were a number of problems that were encountered:
The first surprise when starting packaging PyTorch is that, despite being on PyPI, PyTorch is first and foremost a large C++ code base. It does have a setup.py as commonly found in pure Python packages, but that file delegates the bulk of the work to CMake.

The second surprise is that PyTorch bundles (or "vendors", as some would say) source code for no less than 41 dependencies, ranging from small Python and C++ helper libraries to large C++ neural network tools. Like other distributions such as Debian, Guix avoids bundling: we would rather have one Guix package for each of these dependencies. The rationale is manifold, but it boils down to keeping things auditable, reducing resource usage, and making security updates practical.

[$] A discussion on folios

22 septembre 2021 à 20:52
Par : jake
A few weeks ago, Matthew Wilcox might have guessed that his session at the 2021 Linux Plumbers Conference would be focused rather differently. But, as we reported earlier in September, his folio patch set ran into some, perhaps unexpected, opposition and, ultimately, did not land in the mainline for 5.15. Instead of discussing how to use folios as part of the File Systems microconference, he led a discussion that was, at least in part, on the path forward for them.

GNOME 41 released

22 septembre 2021 à 20:11
Par : ris
The GNOME project has announced the release of GNOME 41.
The most notable changes this in release include an improved Software app, new multitasking settings, and enhanced power management features. With these changes, GNOME is smarter, more flexible, and offers a richer and more engaging experience than ever before.

The new release also comes with significant improvements for developers, including a new developer documentation website, a major new version of the Human Interface Guidelines, new features in the Builder IDE, GTK 4 enhancements, and much more.

Postgres 14: It's The Little Things (Kerstiens)

22 septembre 2021 à 18:31
Par : corbet
Craig Kerstiens highlights some of the "little things" featured in the upcoming PostgreSQL 14 release.

And now in PostgreSQL 14 there is this seemingly small update, pipeline mode, which, according to the docs, allows applications to send a query without having to read the result of the previously sent query. Taking advantage of the pipeline mode, a client will wait less for the server, since multiple queries/results can be sent/received in a single network transaction.

An update on Memory Safety in Chrome

22 septembre 2021 à 18:27
Par : corbet
The Google security blog provides an overview of what is being done to address memory-safety problems in the Chrome browser.

In parallel, we’ll be exploring whether we can use a memory safe language for parts of Chrome in the future. The leading contender is Rust, invented by our friends at Mozilla. This is (largely) compile-time safe; that is, the Rust compiler spots mistakes with pointers before the code even gets to your device, and thus there’s no performance penalty. Yet there are open questions about whether we can make C++ and Rust work well enough together. Even if we started writing new large components in Rust tomorrow, we’d be unlikely to eliminate a significant proportion of security vulnerabilities for many years.

A set of stable kernels

22 septembre 2021 à 17:30
Par : ris
Stable kernels 5.14.7, 5.10.68, 5.4.148, 4.19.207, 4.14.247, 4.9.283, and 4.4.284 have been released. They all contain important fixes and users should upgrade.

Security updates for Wednesday

22 septembre 2021 à 17:15
Par : ris
Security updates have been issued by Debian (grilo), Fedora (curl, firefox, mingw-python-pillow, python-pillow, python2-pillow, and webkit2gtk3), openSUSE (chromium, grafana-piechart-panel, kernel, libcroco, php-composer, and xen), Oracle (curl, kernel, and nss and nspr), Red Hat (nodejs:12), Slackware (alpine), SUSE (ghostscript, grafana-piechart-panel, kernel, and xen), and Ubuntu (linux, linux-hwe, linux-hwe-5.11, linux-hwe-5.4, linux-raspi, linux-raspi-5.4, and linux-raspi2).
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