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Dropping pcr-oracle in user space Full Disk Encryption

Introduction

In user space Full Disk Encryption (FDE), as opposed to the boot loader based FDE, developers for openSUSE supported signed policy and NVIndex policy from the beginning when Trusted Platform Module 2 (TPM2) is used.

With this signed policy, we deliver a JSON file in the EFI System Partition (ESP) that is being read during the initrd stage by systemd-cryptsetup. This file contains the hash policy, which basically describes the expected values of the PCR registers of the TPM2 (measured boot). Together with the policy, we will find a signature that will be validated by the TPM2, and if the PCR values and the signatures are valid, then the TPM2 will unseal the password for the encrypted hard disk, and the boot process can continue.

This method is simple and very flexible. We can update the policy to generate new predictions (for example if a new kernel was installed). Using a private key, that can be stored in the encrypted side of the system, we can sign it and install in the ESP. Another advantage is that we can generate multiple files that support multiple valid configurations, which can represent different snapshots, kernels, or initrd installed in the system.

But one limitation of this method is that we are not protected against a rollback attack. Some one can copy the JSON file (the ESP is not encrypted), together with the kernel and the initrd and wait until some CVE is published for this configuration. After that, the assets can be copied back to the ESP and the signature of the policy will be still valid as far as the TPM2 is concerned. Technically, this can be resolved generating a new private key and enrolling again the devices, but this is not ideal.

systemd-pcrlock provides a new alternative, known as NVIndex policy, which store the policy in the TPM2 non-volatile RAM under a password (recovery PIN). This approach is a bit better for our case, as it resolves the rollback attack. This method is used by default if the TPM2 support it, but because policyAuthorizeNV was introduced in TPM2 Revision 1.38 ten years ago (2016), not all devices can do that. sdbootutil fallbacks to pcr-oracle (signed policy) if NVIndex policy cannot be used.

The next version of sdbootutil will drop pcr-oracle.

Motivation

Basically it is time to do that. The rollback attack is a good argument to avoid signed policies, but we need to factor the maintenance of pcr-oracle for multiple boot loaders (GRUB2 and systemd-boot).

The way that pcr-oracle works means that any change in the event log order or structure needs to be addressed in the source code, but with systemd-pcrlock it is a matter of generating some JSON files stored in /var/lib/pcrlock.d and updating the TPM2 policy in the right moment.

This difference makes pcr-oracle stay behind in the current support, making in effectively broken for any metric.

Migration

The good news is that if you have a TPM2 produced after 2016, you can migrate to systemd-pcrlock very easily. sdbootutil still recognize systems registered with pcr-oracle and can unenroll them. The migration process is as easy as:

  # sdbootutil unenroll --method=tpm2
  #  sdbootutil enroll --ask-pin --method=tpm2

If sadly your TPM2 revision is older, the password enrollment is always available:

  # sdbootutil unenroll --method=tpm2
  #  sdbootutil enroll --method=password

Further Documentation

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Lenovo Thinkbook Modular Dual Screen Laptop | Blathering

Lenovo introduced the ThinkBook Modular AI PC concept at MWC 2026, featuring dual displays, a removable keyboard, and modular ports, appealing to digital nomads. While the machine offers innovative flexibility, its proprietary components and lack of community engagement raise concerns. Overall, it shows incredible potential but has room for some adjustments.
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New toy: Installing FreeBSD on the HP Z2 Mini

Finally, I also installed FreeBSD on my new AI focused mini workstation from HP. I even managed to install GNOME on the machine with minimal effort. However, I also ran into many problems.

So far it’s a mixed experience. Installation went smoothly, FreeBSD 15.0 was up and running in no time. However, FreeBSD is not found by any of the Linux boot managers I use (different flavors of GRUB), and it’s not in the EFI boot menu either. The only way I could boot FreeBSD was bringing up the EFI boot menu, choosing boot from file and loading EFI/freebsd/loader.efi

Once FreeBSD boots on the machine, it is lightning fast. One of the fastest machines I have ever used, in the size of a Lord of the rings book. Still it stays silent while compiling software from FreeBSD ports.

I do not plan to use this box as a FreeBSD desktop, but of course I was curious how much FreeBSD desktop support evolved since I last tried it. I found a nice article on the FreeBSD Foundation website, describing how to install a GUI on FreeBSD using the new desktop-installer tool. It asked tons of questions, did some magic, and after a while I had GNOME up and running.

The good:

  • no manual package installation or configuration editing necessary
  • the exact same GNOME look and feel as on all Linux distributions I tested (except for Ubuntu)
  • sound works, using the built in speaker

The bad:

  • no accelerated graphics at all
  • 3D games start, play music, but no graphics
  • playing YouTube in Firefox works, both graphics and sound, but low quality
  • the screensaver starts automatigically, but cannot be unlocked (workaround: disable screensaver)

The same boring GNOME as everywhere else :-)

The same boring GNOME as everywhere else :-)

I might try to debug some of these issues, but most likely I’ll just reinstall FreeBSD, and keep using it in text-only mode. As far as I could see, there is no in hardware AI acceleration available on FreeBSD. However, with 32 CPU cores, a fast SSD and 128 GB of RAM, this is an ideal box for running complex test environments in FreeBSD jails. I love Bastille and plan to install it once I cleaned up the machine after the GNOME experiment.

This blog is part of a longer series about my adventures with my new machine and AI. You can reach me to discuss this blog on one of the contacts listed in the upper right corner. You can read the rest of the blogs under the toy tag.

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Post-mortem: Stuck Critical Jobs Queue

Between March 4th and 5th, the Open Build Service (OBS) experienced a service degradation. Impact: Users weren’t able to retrieve the diff changes of submit requests. Detection The issue was first identified by team members who noticed that diffs for new submit requests were not loading. Minutes later, it was confirmed that this issue was affecting all submit requests across the production instance. Root Cause Due to multiple factors, the latest code changes increased the...

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Linux Saloon 191 | Application Managers

The Linux Saloon discussion highlighted diverse opinions regarding Google's changes in the Android ecosystem. Bill's insights on data and its implications sparked further exploration. Various application managers and upcoming events were shared, while a poll gauged interest in switching to iOS if sideloading is lost. Participants also linked their projects and resources.

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Tumbleweed – Review of the week 2026/10

Dear Tumbleweed users and hackers,

Last weekend and the beginning of this week, Tumbleweed hit some small roadblocks. A minor change in the selinux-policy package—which looked (and was confirmed to be) obviously correct—resulted in various openQA failures where systems refused to boot due to SELinux enforcement rules.

Luckily, we had openQA to detect this early. After some head-scratching on Monday, we discovered that while the change itself was correct, other code was inadvertently “relying on the wrong behavior” of the previous policy. We always prefer identifying these issues in QA rather than locking users out of their systems. Once this was resolved, Tumbleweed resumed its natural glory and delivered three snapshots (0302, 0303, and 0304).

The main changes delivered in these snapshots were:

  • Complete rebuild: all python312-* modules were removed, freeing build power to add python314-* modules. Such a change requires giving control to the OBS scheduler and relying on the internal logic, rather than using our own bots (that save some build time in regular days, but can’t cope with a full Python stack change without breakage)
  • KDE Plasma 6.6.1 & 6.6.2
  • Linux kernel 6.19.5
  • postfix 3.10.8
  • procps 4.0.6
  • systemd 258.5
  • PostgreSQL 18.3

Looking at the next snapshot in QA and the staging projects, we can predict these changes to reach you in due time:

  • Shadow 4.19.4
  • iptables 1.8.13
  • gstreamer 1.28.1
  • PackageKit 1.3.4
  • kernel longterm 6.18.16
  • KDE Gear 25.12.3
  • Linux kernel 6.19.6
  • systemd 259.3
  • Switch default bootloader on uefi systems to systemd-boot (aligning tumbleweed to microos)
  • GCC 16: our typical 2-phase introduction: first, we change libgcc to come from this compiler, later then use the compiler to build the distro)
  • GNOME 50: RC is staged for QA; release planned for March 18
  • glibc 2.43: metabug: https://bugzilla.opensuse.org/show_bug.cgi?id=1257250

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Planet News Roundup

This is a roundup of articles from the openSUSE community listed on planet.opensuse.org.

The community blog feed aggregator lists the featured highlights below from Feb. 27 to March 5.

Blogs this week highlight the openSUSE Board Election 2025 and Tumbleweed’s February monthly review to sound-reactive LED projects and whether data has weight. Blogs also highlight installing Fedora on the HP Z2 Mini, syslog-ng 4.11.0 packaging status, Obsidian for note-taking, the second Plasma 6.6 bugfix update, KDE Express podcast episodes, Linux Saloon discussions, and open-source playable world generation.

Here is a summary and links for each post:

Episode 70 of KDE Express: Plasma 6.6.1 and the United Nations

The KDE Blog highlights episode 70 of KDE Express with coverage Plasma 6.6.1 updates including Spectacle’s OCR capabilities, accessibility enhancements like grayscale filters and pointer tracking, KDE Connect modernization proposals, and new options for saving global themes and configuring WiFi via QR codes.

New Version Tracking through API and Automatic Labeling

The OBS Blog announces enhancements for a Foster Collaboration beta program as well as new features for package version management along with new status labels. These enhancements add a notification filter for version alerts and display last-synced timestamps to help developers monitor packages at a glance.

KDE Express Episode 69: Trinity Reloaded with Full Plasma

The KDE Blog presents episode 69 of KDE Express, covering the SonicDE fork of KDE Plasma for legacy X11 support, CachyOS adopting Plasma Login Manager, KDE Connect fixes for Bluetooth logging and more.

Data Has Weight But Only on SSDs | Blathering

The CubicleNate Blog explores a lighthearted science exploration rather than practical finding as he dives into the curious concept that data has mass on solid-state drives. Since SSDs store data by trapping electrons in floating gates via quantum tunneling, writing data adds electrons with measurable (though femtogram-scale) mass; this is in contrast with HDDs which merely rearrange existing magnetic polarity without gaining weight. A lighthearted science exploration rather than a practical finding.

New toy: Installing Fedora Linux on the HP Z2 Mini

Peter Czánik’s Blog continues the HP Z2 Mini series with a smooth Fedora installation on the AMD Ryzen AI Max+ PRO 395-powered workstation. Despite Fedora not being listed on the HP data sheet, the graphical installer worked without issue and GNOME’s consistent cross-distro interface made the system immediately familiar. Steam and Need for Speed ran flawlessly, and initial AI acceleration configuration via Copr packages successfully detected the RyzenAI NPU5.

Sound-reactive Sideboard

Sebas’ Blog documents a living room IKEA sideboard turned into a sound-reactive LED centerpiece using an ESP32-based controller running the open-source WLED firmware. The setup uses WS2812B LED strips behind frosted plexi glass doors, processes audio via FFT on one core while rendering up to 200 FPS of LED effects on the other, all under 10W. The project also solved amplifier overheating with HomeAssistant-automated fan control and features a walnut wood finish.

Syslog-ng 4.11.0 Packaging Status

Peter Czánik’s Blog provides an overview of the packaging status for syslog-ng 4.11.0 across various operating systems and tracks which distributions have already made the release available as easy-to-install packages for users who prefer not to compile from source.

Second Plasma 6.6 update

The KDE Blog reports the second bugfix update for Plasma 6.6, delivered two weeks after the initial release. The post recaps Plasma 6.6’s flagship features including the new Plasma Keyboard for touch devices, OCR text extraction in Spectacle, the Plasma Setup wizard, per-application volume control via hover, emoji skin tone selection, QR code Wi-Fi scanning and more.

Compilation from the Free Software Foundation newsletter - March 2026

Victorhck compiles and translates the March 2026 FSF newsletter into Spanish as it highlights the FSF’s 40th anniversary. Highlights include the FSF’s opposition to Google’s mandatory developer verification proposal that threatens F-Droid, coverage of Americans destroying Flock surveillance cameras, and a report on Microsoft confirming it will provide BitLocker recovery keys to authorities under valid legal orders.

Episode 68 of KDE Express: esLibre2026 dixit editor. Editorial design with free software

The KDE Blog presents episode 68 of the KDE Express podcast, covering editorial design with free software and previewing the esLibre2026 event.

Tumbleweed Monthly Update - February 2026

The openSUSE News site publishes the February monthly review covering 17 snapshots. Major highlights include the arrival of Plasma 6.6 with its new on-screen keyboard and Spectacle OCR, KDE Frameworks 6.23.0 with LeakSanitizer memory safety fixes, Linux kernel 6.19.3 with a new listns() system call, GRUB2 2.14 strengthening boot workflows for immutable systems like MicroOS, Mesa 26.0.1 fixing gaming regressions and more.

Obsidian | The Quest for the Perfect Note-Taking Application

The CubicleNate Blog reviews Obsidian as a replacement for TiddlyWiki, praising its markdown-based local-first approach, extensive plugin ecosystem, cross-platform availability via Flatpak and AppImage, and seamless synchronization through Syncthing. While not an open source project, Obsidian is free to use and offers the combination of OneNote’s ease, TiddlyWiki’s power, and standard markdown formatting that the author had been seeking.

Voting Is Now Open for the openSUSE Board Election 2025

The openSUSE News site announces voting has opened for two Board seats for the openSUSE Board Election. Four candidates are on the ballot. Voting runs until March 8 with results announced March 9. All openSUSE Members received ballot links by email.

KDE Express Episode 67: Plasma in Virtual Reality Mode

The KDE Blog presents episode 67 of the KDE Express podcast and covers what’s new with KDE Plasma 6.6 (beta at the time) and highlights a winner of the “car of the year” uses KWin under the engine.

LingBot-World: Open-source “playable” world generation.

Alessandro’s Blog covers LingBot-World, the first high-capacity fully open-source interactive world model. Unlike passive video generation tools, LingBot-World lets users control a camera through AI-generated scenes in real time using W, A, S, and D keys. It achieves 16 FPS with emergent spatial memory that maintains object consistency even after 60 seconds off-screen. The project releases both source code and full model weights.

Linux Saloon 190 | News Flight Night

Video title

The CubicleNate Blog highlights episode 190 of Linux Saloon. The news flight night covered Bazzite tripling its user base in 8 months as gamers seek Windows alternatives, F-Droid’s open letter opposing Google’s mandatory developer verification, and broader discussions about changes to the Android ecosystem.

Linux Saloon 189 | Early Edition

The CubicleNate Blog highlights the return of Linux Saloon’s Early Edition monthly format. Discussion topics included the EU OS proposal for a standardized Linux desktop with Windows migration focus using KDE Plasma, Wayland and desktop environments for modern gaming featuring Bazzite and Nobara, and participants’ recent tech activities including seeking VMware alternatives.

The power of saying “No”

Victorhck reflects on the power of saying “No” in the context of free software and community participation. You may find wisdom in No.

Vietnamese lunar calendar and more rounded highlights – This week in Plasma

The KDE Blog covers the weekly “This Week in Plasma” update, which highlights Vietnamese lunar calendar support and more rounded highlight styles. The blog also covers performance improvements.

openSUSE Tumbleweed Weekly Review – Week 9 of 2026

Victorhck and dimstar report on the snapshots delivered in week 9. The review highlights updates including Linux kernel 6.19.3, PipeWire 1.6.0, Mozilla Firefox 148.0, Mesa 26.0.1, Poppler 26.02.0, QEMU 10.2.1, and DNF 5.4.0. It also covers the progress on the switch to systemd-boot as the default bootloader on UEFI systems to align with Tumbleweed to MicroOS.

My desk Plasma February 2026

The KDE Blog shares thoughts on the Plasma desktop setup, running on a Slimbook Kymera with KDE Neon.. The setup includes functional elements like a moon phase widget, system tray, virtual desktop selector, and a Valencian-language clock, all designed to create a dark yet highly organized workspace.

View more blogs or learn to publish your own on planet.opensuse.org.

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New Version Tracking through API and Automatic Labeling

Building on our recent enhancements to Foster Collaboration, we are excited to introduce our latest updates, including automatic version labeling, handling package versions through API, and more. These updates are part of the Foster Collaboration beta program. You can find more information about the beta program here. Our efforts to foster collaboration started in August 2024, when we introduced labels and bug report links. Next, we improved labels to foster collaboration, allowed labeling projects and...