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Kernel: AMD, Reiser4, Bugs and Xen Release

Submitted by Roy Schestowitz on Thursday 8th of April 2021 04:38:43 PM Filed under
Linux
  • AMD Finally Flipping On ASPM For Navi 1x To Lower Power Consumption - Phoronix

    AMD engineers have a patch pending to improve the idle power consumption for Radeon RX 5000 "Navi 1x" GPUs on Linux.

    While the Radeon RX 6000 "Navi 2x" hardware already can enjoy Active State Power Management (ASPM) on Linux, the AMDGPU kernel driver up to now hasn't enabled ASPM for Navi 1x graphics processors. That though looks to be changing with a pending patch that would allow these original Navi GPUs to enjoy this important PCIe power-savings feature.

  • Reiser4 Ported Early To The Linux 5.12 Kernel - Phoronix

    Normally we don't see the out-of-tree Reiser4 file-system ported to new Linux kernel releases until after the inaugural stable release, but this time around Reiser4 has seen an early port to the near-final Linux 5.12 kernel.

    Reiser4 didn't end up seeing a proper patch release to Linux 5.11 but now to succeed its Linux 5.10 port the code is now re-based against the current Linux 5.12 Git state.

  • BleedingTooth: Google drops full details of zero-click Linux Bluetooth bug chain leading to RCE

    A security researcher at Google has disclosed long-awaited details of zero-click vulnerabilities in the Linux Bluetooth subsystem that allow nearby, unauthenticated attackers “to execute arbitrary code with kernel privileges on vulnerable devices”.

    Dubbed ‘BleedingTooth’, the trio of security flaws were found in BlueZ, the open source, official Linux Bluetooth protocol stack found on Linux-based laptops and IoT devices.

  • Torvalds’ Bug Warning is a Lesson for Linux Users

    Linux does, occasionally, raise security concerns. While many users see it as the most secure, robust and versatile operating system available — that’s this writer’s opinion, as well — security precautions still have to be taken.

    A recent, widely publicized case illustrated this point; Linux creator himself, Linus Torvalds, warned against the use of the Linux 5.12 release. He described a “nasty bug,” and wrote that the situation is a “mess,” due to the use of swap files when adding Linux updates. This nasty bug, in fact, had the potential to destroy entire root directories.

    Some of the main takeaways following this “mess” include: tread very carefully when installing early Linux releases, especially those that involve swapping files instead of partitions, and especially, despite Linux’s well-known security advantages, avoid becoming complacent, because Linux security is not always foolproof.

  • Xen Project ships version 4.15 with Focus on Broader Accessibility, Performance, and Security

    The Xen Project, an open source hypervisor hosted at the Linux Foundation, today announced the release of Xen Project Hypervisor 4.15, which introduces a variety of features allowing for improved performance, security and device pass-through reliability. The Xen Project community continues to be active and engaged, with a wide range of developers from many companies and organizations contributing to this latest release. Additionally, community-wide initiatives, including Functional Safety, VirtIO for Xen and Xen RISC-V port, continue to make valuable progress.

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More on Xen release

Submitted by Roy Schestowitz on Thursday 8th of April 2021 05:44:54 PM.
  • Xen Project Hypervisor 4.15 now Available
  • Xen 4.15 Hypervisor Brings Live Updates To Xenstored

    Out today is version 4.15 of the open-source Xen hypervisor. The focus of Xen 4.15 is on "broader accessibility, performance and security" with a number of noteworthy additions.

    Among the work in store for the Xen 4.15 hypervisor is Arm support for device models in Dom0 as a tech preview, support for exporting Intel Processor Trace Data into tools within Dom0, Viridian enlightnements for guests with more than 64 vCPUs, Xenstored/Oxenstored now supports the "LiveUpdate" tech preview for deploying security fixes without restarting the host, a PV Shim mode for legacy PV guests on HVM-only systems, and support for unified boot images. With unified boot images, it's now possible to boot with a single EFI binary rather than going through GRUB multi-boot.

Xen releases a new version 4.15

Submitted by Roy Schestowitz on Thursday 8th of April 2021 11:55:38 PM.
  • Xen releases a new version 4.15 after a slightly delayed development process

    The Xen project has released another upgrade to its open source hypervisor.

    Development of this new cut – version 4.15 – proved a little trickier than expected, with initial plans for three release candidates and a March 23rd release stretching to five release candidates and release today, April 8th.

    Was it worth the wait? Xen’s feature list highlights the new ability to export Intel Processor Trace data from guests to tools in dom0, which means tools like Intel’s kernel fuzzer have more to work with and thus a better chance of spotting code nasties.

Vulnerabilities In The Linux Kernels BPF Virtual Machine....

Submitted by Roy Schestowitz on Friday 9th of April 2021 10:08:11 PM.

  • Vulnerabilities In The Linux Kernels BPF Virtual Machine Lets Any Local User Run Kernel-Level Code

    A new Linux kernel vulnerability identified as CVE-2021-29154 allows regular unprivileged system users on any modern GNU/Linux users to run code in kernel-mode. Proof of concept exploit code exists. The vulnerability is present up to and including Linux 5.11.12, the Linux kernel developers have yet to release a safe version. A patch and workarounds do exist.

    The Linux kernel has a built-in virtual machine called the extended Berkeley Packet Filter (eBPF). It was primarily intended for firewall-related purposes, but it has become much more than that. It is, in essence, a simple general-purpose virtual machine within the Linux kernel.

    It turns out that the Linux kernels eBPF virtual machine can be tricked into running code it shouldn't due to the way BPF JIT compilers for some architectures compute branch displacements when generating machine code. It is possible to create specially crafted machine code that is executed in kernel mode, thus allowing attackers to execute all sorts of malicious code in kernel mode.

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