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Browsers: Chromium 74 on Slackware, TenFourFox on OS/2, Debugging Firefox Trunk and Brave Forked

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  • Chromium 74 available in my repository. Also for 32bit Slackware.

    The Chromium 74 sources were released a few days ago by Google, and it comes with a long list of fixes for security issues.
    I spent almost two months to investigate why the 32bit package could no longer be built (which is one of the reasons why there were so few updates in march and april – I only have a few hours every day that I can spend on Slackware these days) and had finally managed to compile a 32bit package for Chromium 73 in a 32bit chroot environment on a 64bit Slackware OS, and that package was online for one day…. and now I tried compiling the new release on a regular 32bit Slackware OS and that worked! No idea whether this is because of my modifications of the SlackBuild.

  • Cameron Kaiser: Another interesting TenFourFox downstream

    Because we're one of the few older forks of Firefox to still backport security updates, TenFourFox code turns up in surprising places sometimes. I've known about roytam's various Pale Moon and Mozilla builds; the patches are used in both the rebuilds of Pale Moon 27 and 28 and his own fork of 45ESR. Arctic Fox, which is a Pale Moon 27 (descended from Firefox 38, with patches) rebuild for Snow Leopard and PowerPC Linux, also uses TenFourFox security patches as well as some of our OS X platform code.
    Recently I was also informed of a new place TenFourFox code has turned up: OS/2. There's no Rust for OS/2, so they're in the same boat that PowerPC OS X is, and it doesn't look like 52ESR was ever successfully ported to OS/2 either; indeed, the last "official" Firefox I can find from Bitwise is 45.9. Dave Yeo took that version (as well as Thunderbird 45.9 and SeaMonkey 2.42.9) and backported our accumulated security patches along with other fixes to yield updated "SUa1" Firefox, Thunderbird and SeaMonkey builds for OS/2. If you're curious, here are the prerequisites.

  • Update To rr Master To Debug Firefox Trunk

    The issue is that LMDB opens a file, maps it into memory MAP_SHARED, and then opens the file again and writes to it through the new file descriptor, and requires that the written data be immediately reflected in the shared memory mapping. (This behavior is not guaranteed by POSIX but is guaranteed by Linux.) rr needs to observe these writes and record the necessary memory changes, otherwise they won't happen during replay (because writes to files don't happen during replay) and replay will fail. rr already handled the case when the application write to the file descriptor (technically, the file description) that was used to map the file — Chromium has needed this for a while. The LMDB case is harder to handle. To fix LMDB, whenever the application opens a file for writing, we have to check to see if any shared mapping of that file exists and if so, mark that file description so writes to it have their shared-memory effects recorded. Unfortunately this adds overhead to writable file opens, but hopefully it doesn't matter much since in many workloads most file opens are read-only. (If it turns out to be a problem there are ways we can optimize further.) While fixing this, we also added support for the case where the application opens a file (possibly multiple times with different file descriptions) and then creates a shared mapping of one of them. To handle that, when creating a shared mapping we have to scan all open files to see if any of them refer to the mapped file, and if so, mark them so the effects of their writes are recorded.

  • Gab is forking Brave, and Brave is forking furious

    Gab, the free-speech absolutist social media network, continues to look for creative ways to resist being silenced.

    Having earned a reputation as a platform that is tolerant of even the most hateful (yet still technically legal) expressions of speech, Gab has been booted off virtually every Silicon Valley service imaginable—from payment processors to web host providers.

    Now, fresh off having its browser plug-in Dissenter, the “comment section of the Internet,” ejected from the Google and Mozilla extension libraries, Gab is taking the oft-used “if you don’t like it, go create your own” criticism to heart. The company has built its own web browser—a forked version of the open-source Brave browser—and will be releasing it within the next few weeks, Gab CEO Andrew Torba tells Decrypt .

More in Tux Machines

Linux Foundation Statement on Huawei Entity List Ruling

Thank you for your inquiry regarding concerns with a member subject to an Entity List Ruling.[1] While statements in the Executive Order prompting the listing used language granting a broader scope of authority, the Huawei Entity List ruling was specifically scoped to activities and transactions subject to the Export Administration Regulation (EAR). Open source encryption software source code was reclassified by the US Department of Commerce, Bureau of Industry and Security (BIS) effective September 20, 2016 as “publicly available” and no longer “subject to the EAR.”[2] Each open source project is still required to send a notice of the URL to BIS and NSA to satisfy the “publicly available” notice requirement in the EAR at 15 CFR § 742.15( b ). Read more

Android Leftovers

Huawei Linux Laptop Driver Improvements On The Way

Huawei laptops have already worked well on Linux like the MateBook while further improvements are forthcoming, as is commonly the case for x86 laptops with various quirks and other non-standard support bits. A patch was sent out today for improving the Linux kernel's existing Huawei laptop driver and extending it from being just a WMI hot-keys driver to now being a platform driver with extra functionality. The added functionality to this Huawei-WMI Linux driver includes controlling the mic/mute LED, controlling battery charging thresholds, adjusting the Fn-lock state, and related functionality. Read more Also: Huawei laptop extras driver

Kernel: Wayland, NVIDIA and Linux Development (LWN)

  • Problems Being Investigated Under Wayland Itches Program, Including Gaming Performance
    Last week we wrote about a "Wayland Itches" program being devised by prolific open-source contributor Hans de Goede of Red Hat. The goal of this program is to address itches/paper-cuts/problems in using GNOME Shell atop Wayland. He's received a fair amount of feedback so far and has some early indications to share. Hans de Goede wrote two blog posts today outlining the early feedback to his Wayland Itches project. Two items he is going to look into initially are middle-click on title/header bar to lower the Window not working for native applications and sudo/pfexec not working on Wayland. For the sudo/pfexec support, Hans is planning to optionally support the ability for GUI apps to connect when running as root. That was rejected upstream before but his plan is for this to be an optional feature for enabling the xauth file for allowing XWayland as root by GNOME-Shell/Mutter.
  • NVIDIA 418.52.07 Linux Driver Wires In Two More Extensions
    NVIDIA today released the 418.52.07 Linux driver as an updated build intended for Vulkan developers with it introducing support for two more extensions.
  • BPF: what's good, what's coming, and what's needed
    The 2019 Linux Storage, Filesystem, and Memory-Management Summit differed somewhat from its predecessors in that it contained a fourth track dedicated to the BPF virtual machine. LWN was unable to attend most of those sessions, but a couple of BPF-related talks were a part of the broader program. Among those was a plenary talk by Dave Miller, described as "a wholistic view" of why BPF is successful, its current state, and where things are going. Years ago, Miller began, Alexei Starovoitov showed up at a netfilter conference promoting his ideas for extending BPF. He described how it could be used to efficiently implement various types of switching fabric — any type, in fact. Miller said that he didn't understand the power of this idea until quite a bit later.
  • The first half of the 5.2 merge window
    When he released the 5.1 kernel, Linus Torvalds noted that he had a family event happening in the middle of the 5.2 merge window and that he would be offline for a few days in the middle. He appears to be trying to make up for lost time before it happens: over 8,300 non-merge changesets have found their way into the mainline in the first four days. As always, there is a wide variety of work happening all over the kernel tree.
  • DAX semantics
    In the filesystems track at the 2019 Linux Storage, Filesystem, and Memory-Management Summit, Ted Ts'o led a discussion about an inode flag to indicate DAX files, which is meant to be applied to files that should be directly accessed without going through the page cache. XFS has such a flag, but ext4 and other filesystems do not. The semantics of what the flag would mean are not clear to Ts'o (and probably others), so the intent of the discussion was to try to nail those down. Dan Williams said that the XFS DAX flag is silently ignored if the device is not DAX capable. Otherwise, the file must be accessed with DAX. Ts'o said there are lots of questions about what turning on or off a DAX flag might mean; does it matter whether there are already pages in the page cache, for example. He said that he did not have any strong preference but thought that all filesystems should stick with one interpretation. While Christoph Hellwig described things as "all broken", Ts'o was hoping that some agreement could be reached among the disparate ideas of what a DAX flag would mean. A few people think there should be no flag and that it should all be determined automatically, but most think the flag is useful. He suggested starting with something "super conservative", such as only being able to set the flag for zero-length files or only empty directories where the files in it would inherit the flag. Those constraints could be relaxed later if there was a need.
  • A filesystem for virtualization
    A new filesystem aimed at sharing host filesystems with KVM guests, virtio-fs, was the topic of a session led by Miklos Szeredi at the 2019 Linux Storage, Filesystem, and Memory-Management Summit. The existing solution, which is based on the 9P filesystem from Plan 9, has some shortcomings, he said. Virtio-fs is a prototype that uses the Filesystem in Userspace (FUSE) interface. The existing 9P-based filesystem does not provide local filesystem semantics and is "pretty slow", Szeredi said. The FUSE-based virtio-fs (RFC patches) is performing "much better". One of the ideas behind the new filesystem is to share the page cache between the host and guests, so there would be no data duplication for multiple guests accessing the same files from the host filesystem. There are still some areas that need work, however. Metadata and the directory entry cache (dcache) cannot be shared, because data structures cannot be shared between the host and guests. There are two ways to handle that. Either there can be a round trip from the guest to the host for each operation to ensure the coherence of the metadata cache and dcache, or the guest can cache that information and somehow revalidate the cache on each operation without going to the host kernel.
  • Common needs for Samba and NFS
    Amir Goldstein led a discussion on things that the two major network filesystems for Linux, Samba and NFS, could cooperate on at the end of day one of the 2019 Linux Storage, Filesystem, and Memory-Management Summit. In particular, are there needs that both filesystems have that the kernel is not currently providing? He had some ideas of areas that might be tackled, but was looking for feedback from the assembled filesystem developers. He has recently just started looking at the kernel NFS daemon (knfsd) as it is a lesser use case for the customers of his company's NAS device. Most use Samba (i.e. SMB). He would like to see both interoperate better with other operating systems, though.
  • NFS topics
    Trond Myklebust and Bruce Fields led a session on some topics of interest in the NFS world at the 2019 Linux Storage, Filesystem, and Memory-Management Summit. Myklebust discussed the intersection of NFS and containers, as well adding TLS support to NFS. Fields also had some container changes to discuss, along with a grab bag of other areas that need attention. Myklebust began with TLS support for the RPC layer that underlies NFS. One of the main issues is how to do the upcall from the RPC layer to a user-space daemon that would handle the TLS handshake. There is kernel support for doing TLS once the handshake is complete; hardware acceleration of TLS was added in the last year based on code from Intel and Mellanox, he said. RPC will use that code, but there is still the question of handling the handshake.