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[$] 5.18 Merge window, part 2

월, 2022/04/04 - 11:11오후
Linus Torvalds released the 5.18-rc1 kernel prepatch on April 3, after having pulled 13,207 non-merge changesets into the mainline repository. This merge window has thus not only been turbulent, with a significant number of regressions and refused pull requests, it has also been relatively busy. Just over 9,000 of those changesets were pulled after the first 5.18 merge window summary was written; the time has come to catch up with the remainder of changes merged for this development cycle.
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Security updates for Monday

월, 2022/04/04 - 10:40오후
Security updates have been issued by Debian (asterisk, qemu, and zlib), Fedora (389-ds-base, ghc-cmark-gfm, ghc-hakyll, gitit, libkiwix, openssl, pandoc, pandoc-citeproc, patat, phoronix-test-suite, seamonkey, and skopeo), Mageia (libtiff, openjpeg2, and php-smarty), openSUSE (python), Oracle (httpd), Red Hat (httpd), and SUSE (libreoffice, python, and python36).
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Kernel prepatch 5.18-rc1

월, 2022/04/04 - 7:16오전
Linus has released 5.18-rc1 and closed the merge window for the 5.18 release. "In fact, at least in pure commits, this has been a bigger merge window than we've had in some time. But let's hope it's all smooth sailing this release." In the end, 13,207 non-merge changesets were merged during this merge window.
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The 4.14.275 stable kernel is out

일, 2022/04/03 - 7:05오전
The 4.14.275 stable kernel update has been released; it seems to consist mostly of backports of a set of arm64 Spectre mitigations.
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Boucher: rustc_codegen_gcc can now bootstrap rustc

금, 2022/04/01 - 11:37오후
On his blog, Antoni Boucher updates the status of rustc_codegen_gcc, which "is a GCC codegen for rustc, meaning that it can be loaded by the existing rustc frontend, but benefits from GCC by having more architectures supported and having access to GCC’s optimizations". A significant milestone has been reached: "the GCC codegen has made enough progress to be able to compile rustc itself". For the Rust programming language, rustc is the standard compiler, so this work will eventually allow programs to be built for a number of architectures that are not supported by rustc. He also made progress beyond just building the compiler as he "was able to compile rustc using the GCC codegen and use the resulting rustc to compile a Hello World".
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[$] A security fix briefly breaks DMA

금, 2022/04/01 - 11:30오후
In theory, direct memory access (DMA) operations are simple to understand; a device transfers data directly to or from a memory buffer managed by the CPU. Almost all contemporary devices perform DMA, since it would not be possible to obtain the needed performance without it. Like so many things, DMA turns out to be a bit more complicated in practice. That complexity led to an erroneous patch, intended to improve security, breaking DMA for some devices in 5.17 and some stable kernels.
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Security updates for Friday

금, 2022/04/01 - 11:05오후
Security updates have been issued by Debian (wireshark), Fedora (389-ds-base), Mageia (golang, wavpack, and zlib), openSUSE (yaml-cpp), SUSE (expat and yaml-cpp), and Ubuntu (linux, linux-aws, linux-kvm, linux-lts-xenial, linux-aws-5.4, linux-azure, linux-gcp, linux-gcp-5.13, linux-gcp-5.4, linux-gke, linux-gke-5.4, linux-gkeop, linux-gkeop-5.4, linux-aws-hwe, linux-gcp-4.15, linux-oracle, linux-intel-5.13, and tomcat9).
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[$] Indirect branch tracking for Intel CPUs

목, 2022/03/31 - 11:59오후
"Control-flow integrity" (CFI) is a set of technologies intended to prevent an attacker from redirecting a program's control flow and taking it over. One of the approaches taken by CFI is called "indirect branch tracking" (IBT); its purpose is to prevent an attacker from causing an indirect branch (a function call via a pointer variable, for example) to go to an unintended place. IBT for Intel processors has been under development for some time; after an abrupt turn, support for protecting the kernel with IBT has been merged for the upcoming 5.18 release.
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Security updates for Thursday

목, 2022/03/31 - 11:30오후
Security updates have been issued by Debian (libgc and pjproject), Fedora (cobbler, mingw-openjpeg2, and openjpeg2), Mageia (openvpn), openSUSE (abcm2ps, fish3, icingaweb2, kernel-firmware, nextcloud, openSUSE-build-key, python2-numpy, salt, and zlib), Slackware (vim), SUSE (kernel-firmware, opensc, python2-numpy, python3, salt, and zlib), and Ubuntu (dosbox, linux, linux-aws, linux-azure, linux-gcp, linux-hwe-5.13, linux-hwe-5.4, linux-kvm, linux-oracle, linux-oracle-5.4, linux, linux-aws, linux-azure-4.15, linux-dell300x, linux-hwe, linux-kvm, linux-snapdragon, rsync, twisted, and zlib).
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[$] LWN.net Weekly Edition for March 31, 2022

목, 2022/03/31 - 12:26오후
The LWN.net Weekly Edition for March 31, 2022 is available.
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[$] Systemd discusses its kernel-version needs

목, 2022/03/31 - 6:49오전
A query regarding the possibility of dropping support for older kernels in systemd led to some discussion on the systemd-devel mailing list recently. As might be guessed, exactly which kernel would be the minimum supported, what kernel features systemd is using, and when those kernel features became available, were all part of that conversation. A component like systemd that is closely tied to the kernel, and the interfaces different versions provide, has a number of different factors to consider when making a decision of this sort.
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OpenSUSE adopts a new code of conduct

목, 2022/03/31 - 12:14오전
The openSUSE project has announced the adoption of a new code of conduct: "We hope that by having a clear and concise Code of Conduct for the project, the openSUSE Community can continue to grow and prosper in the years to come".
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Security updates for Wednesday

수, 2022/03/30 - 10:51오후
Security updates have been issued by CentOS (expat, firefox, httpd, openssl, and thunderbird), Debian (cacti), Fedora (kernel, rsh, unrealircd, and xen), Mageia (kernel and kernel-linus), openSUSE (apache2, java-1_8_0-ibm, kernel, openvpn, and protobuf), Oracle (openssl), Red Hat (httpd:2.4, kernel, kpatch-patch, and openssl), SUSE (apache2, java-1_7_1-ibm, java-1_8_0-ibm, kernel, openvpn, protobuf, and zlib), and Ubuntu (chromium-browser and paramiko).
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[$] Problems emerge for a unified /dev/*random

수, 2022/03/30 - 6:24오전
In mid-February, we reported on the plan to unite the two kernel devices that provide random numbers; /dev/urandom was to effectively just be another way to access the random numbers provided by /dev/random. That change made it as far as the mainline during the Linux 5.18 merge window, but it was quickly reverted when problems were found. It may be possible to do that unification someday, but, for now, there are environments that need their random numbers early on—without entropy or the "Linus jitter dance" being available on the platform.
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Fedora 36 beta released

수, 2022/03/30 - 4:11오전
The Fedora 36 beta release has been announced.

Fedora 36 Workstation Beta includes GNOME 42, the newest release of the GNOME desktop environment. GNOME 42 includes a global dark style UI setting. It also has a redesigned screenshot tool. And many core GNOME apps have been ported to the latest version of the GTK toolkit, providing improved performance and a modern look.

If all goes well, the final Fedora 36 release will happen at the end of April.

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Security updates for Tuesday

화, 2022/03/29 - 10:32오후
Security updates have been issued by Debian (libdatetime-timezone-perl, pjproject, and tzdata), Mageia (chromium-browser-stable, docker, graphicsmagick, and libtiff), Oracle (expat), Red Hat (expat, httpd:2.4, openssl, and screen), Scientific Linux (expat and openssl), and Ubuntu (libtasn1-6, linux-oem-5.14, openjdk-lts, and paramiko).
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Some nftables security vulnerabilities

화, 2022/03/29 - 8:33오전
A new set of vulnerabilities has been disclosed in the nftables subsystem; these lead fairly easily to a local system compromise, on some configurations at least. Fixes for these vulnerabilities were present in the March 28 stable updates; upgrading seems like a good idea.
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[$] Pointer tagging for x86 systems

화, 2022/03/29 - 1:06오전
Pointers are a fact of life for developers working in numerous languages. It is often convenient to be able to associate a small amount — a few bits at most — of ancillary information with a pointer. This can often be done within the pointer value itself with some careful masking and shifting. CPU manufacturers have been adding ways to support the addition of this sort of "tag" to pointers; the most recent may be AMD's "upper address ignore" (UAI) feature, support for which was recently posted by Bharata B Rao. This feature has an uncertain future in Linux, though, as the result of a fundamental design decision.
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Debian decides to allow secret votes

화, 2022/03/29 - 12:02오전
The Debian project has been voting on a general resolution that would allow secret voting on future issues. The results have been posted in unofficial form, and the winner was "proposal B": "Hide identities of Developers casting a particular vote and allow verification". One might think that closes the discussion, but Debian project leader candidate Felix Lechner is questioning the election and calling for it to be redone — something that the Debian constitution lacks provisions for.
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Eight new stable kernels

월, 2022/03/28 - 11:52오후
Greg Kroah-Hartman has announced the release of new stable kernels: 5.17.1, 5.16.18, 5.15.32, 5.10.109, 5.4.188, 4.19.237, 4.14.274, and 4.9.309. They contain a relatively small set of important fixes throughout the three; users of those series should upgrade.
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