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[$] The beginning of a process-builder API
The recent discussion on "spawn templates" raised questions about whether it was time to provide an alternative to the classic Unix fork()/exec() pattern for process creation. One idea that was raised there was to shift the template pattern into an interface that could be used to efficiently assemble new processes from bare cloth, without duplicating the parent process. Preferably, that interface would be able to implement posix_spawn(). Li Chen, the author of the spawn-template work, has now responded with a patch series (written with significant LLM assistance) showing what a process-builder API for Linux might look like.
[$] Buffer sizes for FUSE io_uring
The Filesystem in Userspace (FUSE) subsystem provides a way to service filesystem requests from a user-space server, which moves the format-handling code out of the kernel. The FUSE server can use the io_uring facility for better performance, but Bernd Schubert is concerned that memory is being wasted because the current implementation has a single, large buffer size that is excessive for small I/O operations. He led a discussion on that topic in the filesystem track of the 2026 Linux Storage, Filesystem, Memory Management, and BPF Summit in Zagreb, Croatia.
[$] The future of libraries in BPF
Song Liu believes that the way that programmers assemble complex BPF programs will be changing rapidly in the future. At a session of the 2026 Linux Storage, Filesystem, Memory-Management, and BPF Summit, he shared his thoughts on what that change could look like, though he did not have any concrete proposals for what, if anything, the BPF maintainers should do. He anticipates an ecosystem of Rust BPF packages developing, which is significant because BPF does not really have a package manager at the moment.
[$] Reconsidering O_CREAT|O_DIRECTORY
Linux provides a system call (mkdir()) to create a directory, and a few variants of open() that can open a directory. There is, however, no system call in Linux that can create and open a directory in a single, race-free call. Jori Koolstra has been working on remedying that situation, most recently by repurposing a set of open() flags that currently return an error. There are, however, concerns that show just how hard it can be to create user-space interfaces that do not present traps for application developers.
[$] LWN.net Weekly Edition for July 30, 2026
Posted Jul 30, 2026 0:01 UTC (Thu)The LWN.net Weekly Edition for July 30, 2026 is available.
Inside this week's LWN.net Weekly Edition
- Front: Hazard pointers; DFSG team; Swap devices; Netkit and BPF; BPF inlined functions; Fedora GRUB; gccrs.
- Briefs: RIP Dan Williams; Debian LLM resolution; Fedora 45 process; Codeberg LLM policy; GCC LLM policy; GNU Binutils 2.47; GNU C Library 2.44; Wayfire 0.11; Quotes; ...
- Announcements: Newsletters, conferences, security updates, patches, and more.
[$] Debugging information for inlined functions
BPF programs use BPF type format (BTF) debugging information in order to determine how to interact with functions in the kernel. Specifically, tracing a kernel function involves finding its address in the kernel's BTF section — but that doesn't work for functions that have been inlined, and therefore don't have a single, specific address. Alan Maguire wants to add information about inlined functions to BTF in order to allow them to be traced, and led a session on that topic at the 2026 Linux Storage, Filesystem, Memory-Management, and BPF Summit.
[$] Fedora approves a smaller GRUB
Leo Sandoval and Marta Lewandowska have put forward a change proposal for Fedora 45, which is expected in October, to provide a separate, slimmed-down version of GRUB for a niche use case. The new package would be in addition to the main GRUB package and would not replace it for the majority of Fedora users. The idea met with some resistance from Fedora contributors who thought that it would be better to use systemd-boot, or another modern bootloader, rather than trying to wrangle GRUB into a suitable state for the use case. The Fedora Engineering Steering Council (FESCo), however, voted to accept the change on July 7.
[$] Progress toward compiling Linux with gccrs
The gccrs project, which is creating a Rust frontend for the GCC compiler, has spent the first half of 2026 focusing on compiling the Linux kernel. By testing the compiler against the kernel crates, the development team has made significant progress toward generating correct code for other Rust programs. As detailed in the project's weekly and monthly reports, this effort has uncovered and resolved problems in areas such as attribute handling (described in the report for February), name resolution, and resource management (both detailed in the May report). Currently, the compiler can only handle simple standalone programs, but that situation could change rapidly in the coming months.
[$] A report from Debian's new DFSG team
The DFSG, Licensing & New Packages Team (usually shortened to "DFSG team") was created in October 2025 as part of the ftpmaster team split. Its job is to review packages in the new queue for compliance with the Debian Free Software Guidelines (DFSG), among other things, before the packages are allowed to enter the Debian archive. The change was long in coming, and some questions remained after the split whether it was the right move. Andrew McMillan provided an overview of the team's activities and its current status during DebConf26. While it may be too early to say with certainty, his report suggests that the new division of duties is working out well.
[$] Hazard pointers for the kernel
The kernel's read-copy-update (RCU) subsystem ensures that data will not be deleted until it is known that there are no threads holding references to it. RCU works well and is widely used throughout the kernel, but it can increase memory use and add significant delays before unused kernel objects are cleaned up. Hazard pointers are an alternative approach to lockless data updates that offers better performance, for some situations at least. The kernel community is currently considering a hazard-pointer implementation by Mathieu Desnoyers and Paul McKenney.
Security updates for Tuesday
Security updates have been issued by AlmaLinux (frr, ldns, mingw-glib2, and perl-Archive-Tar), Debian (ruby2.7), Fedora (borgbackup, nebula, python-nh3, rust-ammonia, and seamonkey), Mageia (librabbitmq, libvncserver, packages, perl, perl-GD, perl-Unicode-LineBreak, squid, and unbound), Oracle (compat-libtiff3, frr, gstreamer1-plugins-good, javapackages-tools:201801, libreswan, nodejs:22, nodejs:24, p11-kit, perl-Archive-Tar, perl-DBI, php, pki-deps:10.6, and python-tornado), and SUSE (aws-iam-authenticator, bind, containerd, gawk, google-cloud-sap-agent, ignition, ImageMagick, java-11-openjdk, libpng16, libssh, mcphost, nginx, openssh, openssl-1_1, perl-DBI, perl-HTTP-Date, perl-Net-DNS, python-urwid, python3-dulwich, python312, python313, python3, python313-pydantic, python313-sentry-sdk, rrdtool, s390-tools, samba, spice-vdagent, vim, and xen).
Twenty years of Pandoc
John MacFarlane has published a lengthy retrospective to commemorate twenty years of the Pandoc document converter.
On August 3, 2006, I uploaded the first version of pandoc to my website, releasing it under the free GPL license. Pandoc 0.1 consisted of about 3000 lines of Haskell code, with no dependencies aside from GHC's standard library. It could convert Markdown, reStructuredText, HTML, and LaTeX documents into any of these formats, plus RTF or S5. I had no idea at the time that this would just be the first of over two hundred releases over the next twenty years; that the project would become the most popular program written in Haskell; that I would spend countless hours on bug-fixes, improvement, and project management; that I would collaborate with programmers in many other countries; that pandoc would come to support over fifty document formats; that it would allow automatic generation of citations and bibliographies; that it would become integrated into academic writing tools like Quarto and Jupyter Notebook; that it would be installed on millions of computers around the world.
How did this happen? I want to take advantage of pandoc's birthday to tell the story of the project, as best I can remember it.
C-Kermit 11 released
For those of us with a long memory: John Goerzen has announced the release of C-Kermit 11, the first release of this file-transfer utility in 15 years.
As Debian maintainer of Kermit, I noticed some areas where it wasn't matching modern expectations. One area was, not surprising for a project of its age, security. Another area was that its character set or line-ending conversions are usually not desired now; we are used to byte-identical binary transfers, and the defaults caused confusion and even some rare instances of data corruption. So I started making a few patches last year.
See the changelog for details on the work that has been done.
Most of us probably haven't thought about C-Kermit in years (if ever), but there was a time when it was an essential tool for moving files between machines.
SQLite Critical CVEs or LLM Slop? (JFrog blog)
The JFrog blog examines some reported vulnerabilities in SQLite, some of which made their way into high-profile vulnerability databases, that turned out to be entirely fabricated by LLMs.
These LLM slop CVEs can cause organizations to waste time investigating and patching vulnerabilities that do not actually exist, as well as polluting vulnerability databases. In environments where Critical vulnerabilities are automatically prioritized or tickets are opened based on vulnerability scores, such fabricated CVEs can turn into a real burden.In environments where AI is used to automate vulnerability triage and remediation this becomes even more concerning. An AI agent that encounters a fabricated CVE may attempt to locate the vulnerable function, generate a patch, or recommend changes based on code that does not even exist. Instead of helping security teams remediate real vulnerabilities, it can lead them down a completely wrong path, potentially introducing unnecessary changes and wasting time.
Four stable kernels for Monday
Greg Kroah-Hartman has announced the release of the 7.1.6, 6.18.42, 6.12.101, and 6.6.148 stable kernels. Each contains hundreds of patches—the 7.1.6 kernel has more than 700—with fixes throughout the tree. Users are advised to upgrade.
NetBSD 11.0 released
The release of NetBSD 11.0, the 19th major version of the operating system, has been announced. There are many changes and enhancements since the 10.1 release, including a new port to RISC-V, better support for Linux system calls in compat_linux(), as well as improvements to the NPF firewall.
As you are probably aware, the number of security issues found or suspected everywhere has massively increased with the advent of AI tools. As a consequence, we can't publish a release without open issues. Instead of delaying the release further to fix them (new ones are being reported all the time), we've instead chosen to be transparent about this.
See the full release notes for links to the binary distributions and links to the full change logs.
Security updates for Monday
Security updates have been issued by AlmaLinux (.NET 10.0, .NET 8.0, .NET 9.0, fence-agents, kernel, kernel-rt, openssh, osbuild-composer, perl-Archive-Tar, perl-DBI, perl:5.32, pipewire, python-pillow, qemu-kvm, unbound, and vim), Debian (chromium, incus, kernel, kissfft, libgd2, libmodbus, libssh, node-tar, php8.4, poppler, python-authlib, sslh, and starlette), Fedora (borgbackup, coturn, curl, exim, fuse-overlayfs, gh, GitPython, goaccess, lemonldap-ng, libgit2, nextcloud, nsd, php, postgresql16, python3.12, rabbitmq-server, rust-libgit2-sys, and xen), Mageia (bluez, firmware, kernel, kmod, wireless-regdb), Oracle (buildah, compat-libtiff3, dovecot, fence-agents, firefox, gimp, glibc, grafana, gstreamer1-plugins-bad-free, java-25-openjdk, kernel, libgcrypt, libtiff, libXfont2, nodejs24, nodejs:22, nodejs:24, openssh, openssl, PackageKit, pipewire, python-pillow, rest, sssd, vim, and yelp), SUSE (bind, chromium, dnsdist, gdk-pixbuf-loader-libheif, gio-branding-upstream, google-guest-agent, govulncheck-vulndb, GraphicsMagick, ignition, ImageMagick, keybase-client, kronosnet, libblkid-devel, libntpc1, libpng16, nano, openssh, openssl-1_0_0, openssl-3, openvpn, PackageKit, perl-mojolicious, php8, python-nltk, python313-asteval, python313-certifi, python313-GitPython, python313-huggingface-hub, rsyslog, tomcat, tomcat10, tomcat11, traefik2, valkey, warewulf4, webkit2gtk3, and yq), and Ubuntu (linux-intel-iotg).
Kernel prepatch 7.2-rc6
The 7.2-rc6 kernel prepatch is out for
testing. Quoth Linus: "Hmm. This rc is huge. Even by the "new normal"
standards this is a big rc, and I think it's the biggest rc6 we've had in
years at least by commit count.
" There were 537 non-merge commits
applied between 7.2-rc5 and 7.2-rc6.
Servo 0.4.0 released
The Servo web-browser engine project has published an update about all of the changes that landed in June 2026, along with version 0.4.0 of the Servo Tech Demo. This release includes a record 558 commits, better layout correctness for web sites, improved WebGPU support, enhancements for users who are using the servoshell test browser, and many performance and stability fixes.
Arch Linux disables AUR package adoption
The Arch Linux DevOps team has announced
that adoption of orphaned packages in the Arch User Repository (AUR)
has been disabled due to "the current influx of malicious package
adoptions and follow-up commits made via the AUR
". Michael Taggart
has posted a brief analysis of the malware being added to a long
list of packages in this round of attacks. The payload appears
to be an remote-access trojan (RAT) that takes commands over the
Tor network and attempts to upload a wide range of user data.
The project had suspended new account registration in June. That followed a campaign in which an attacker or attackers created new accounts to adopt orphaned packages and push malicious updates to them that would install malware on user systems. AUR registration was reopened on July 13 after the DevOps team added some minor, and apparently ineffective, restrictions on creating new accounts.