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"The big set of open-source graphics driver updates for Linux 6.15 have been merged," writes Phoronix, "but Linux creator Linus Torvalds isn't particularly happy with the pull request." The new "hdrtest" code is for the Intel Xe kernel driver and is around trying to help ensure the Direct Rendering Manager header files are self-contained and pass kernel-doc tests — basic maintenance checks on the included DRM header files to ensure they are all in good shape. But Torvalds accused the code of not only slowing down the full-kernel builds, but also leaving behind "random" files for dependencies "that then make the source tree nasty," reports Tom's Hardware: While Torvalds was disturbed by the code that was impacting the latest Linux kernel, beginning his post with a "Grr," he remained precise in his objections to it. "I did the pull, resolved the (trivial) conflicts, but I notice that this ended up containing the disgusting 'hdrtest' crap that (a) slows down the build because it's done for a regular allmodconfig build rather than be some simple thing that you guys can run as needed (b) also leaves random 'hdrtest' turds around in the include directories," he wrote. Torvalds went on to state that he had previously complained about this issue, and inquired why the hdr testing is being done as a regular part of the build. Moreover, he highlighted that the resulting 'turds' were breaking filename completion. Torvalds underlined this point — and his disgust — by stating, "this thing needs to *die*." In a shot of advice to fellow Linux developers, Torvalds said, "If you want to do that hdrtest thing, do it as part of your *own* checks. Don't make everybody else see that disgusting thing...." He then noted that he had decided to mark hdrtest as broken for now, to prevent its inclusion in regular builds. As of Saturday, all of the DRM-Next code had made it into Linux 6.15 Git, notes Phoronix. "But Linus Torvalds is expecting all this 'hdrtest' mess to be cleaned up."

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An anonymous reader shared this report from BleepingComputer: Three security bypasses have been discovered in Ubuntu Linux's unprivileged user namespace restrictions, which could be enable a local attacker to exploit vulnerabilities in kernel components. The issues allow local unprivileged users to create user namespaces with full administrative capabilities and impact Ubuntu versions 23.10, where unprivileged user namespaces restrictions are enabled, and 24.04 which has them active by default... Ubuntu added AppArmor-based restrictions in version 23.10 and enabled them by default in 24.04 to limit the risk of namespace misuse. Researchers at cloud security and compliance company Qualys found that these restrictions can be bypassed in three different ways... The researchers note that these bypasses are dangerous when combined with kernel-related vulnerabilities, and they are not enough to obtain complete control of the system... Qualys notified the Ubuntu security team of their findings on January 15 and agreed to a coordinated release. However, the busybox bypass was discovered independently by vulnerability researcher Roddux, who published the details on March 21. Canonical, the organization behind Ubuntu Linux, has acknowledged Qualys' findings and confirmed to BleepingComputer that they are developing improvements to the AppArmor protections. A spokesperson told us that they are not treating these findings as vulnerabilities per se but as limitations of a defense-in-depth mechanism. Hence, protections will be released according to standard release schedules and not as urgent security fixes. Canonical shared hardening steps that administrators should consider in a bulletin published on their official "Ubuntu Discourse" discussion forum.

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An anonymous reader quotes a report from ZDNet, written by Steven Vaughan-Nichols: Despite the minor delay, Linux 6.14 arrives packed with cutting-edge features and improvements to power upcoming Linux distributions, such as the forthcoming Ubuntu 25.04 and Fedora 42. The big news for desktop users is the improved NTSYNC driver, especially those who like to play Windows games or run Windows programs on Linux. This driver is designed to emulate Windows NT synchronization primitives. What that feature means for you and me is that it will significantly improve the performance of Windows programs running on Wine and Steam Play. [...] Gamers always want the best possible graphics performance, so they'll also be happy to see that Linux now supports recently launched AMD RDNA 4 graphics cards. This approach includes support for the AMD Radeon RX 9070 XT and RX 9070 graphics cards. Combine this support with the recently improved open-source RADV driver and AMD gamers should see the best speed yet on their gaming rigs. Of course, the release is not just for gamers. Linux 6.14 also includes several AMD and Intel processor enhancements. These boosts focus on power management, thermal control, and compute performance optimizations. These updates are expected to improve overall system efficiency and performance. This release also comes with the AMDXDNA driver, which provides official support for AMD's neural processing units based on the XDNA architecture. This integration enables efficient execution of AI workloads, such as convolutional neural networks and large language models, directly on supported AMD hardware. While Rust has faced some difficulties in recent months in Linux, more Rust programming language abstractions have been integrated into the kernel, laying the groundwork for future drivers written in Rust. [...] Besides drivers, Miguel Ojeda, Rust for Linux's lead developer, said recently that the introduction of the macro for smart pointers with Rust 1.84: derive(CoercePointee) is an "important milestone on the way to building a kernel that only uses stable Rust functions." This approach will also make integrating C and Rust code easier. We're getting much closer to Rust being grafted into Linux's tree. In addition, Linux 6.14 supports Qualcomm's latest Snapdragon 8 Elite mobile processor, enhancing performance and stability for devices powered by this chipset. That support means you can expect to see much faster Android-based smartphones later this year. This release includes a patch for the so-called GhostWrite vulnerability, which can be used to root some RISC-V processors. This fix will block such attacks. Additionally, Linux 6.14 includes improvements for the copy-on-write Btrfs file system/logical volume manager. These primarily read-balancing methods offer flexibility for different RAID hardware configurations and workloads. Additionally, support for uncached buffered I/O optimizes memory usage on systems with fast storage devices. Linux 6.14 is available for download here.

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