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LWN.net is a comprehensive source of news and opinions from and about the Linux community. This is the main LWN.net feed, listing all articles which are posted to the site front page.



 



Kernel prepatch 4.16-rc2

2018-02-19T04:04:38+00:00

The second 4.16 kernel prepatch is out. "Go out and test, it all looks fine."



Some weekend stable kernel updates

2018-02-18T21:15:44+00:00

The 4.15.4, 4.14.20, 4.9.82, 4.4.116, and 3.18.95 stable kernel updates have all been released. These kernels contain a relatively large set of important fixes and updates.



[$] The boot-constraint subsystem

2018-02-16T18:57:02+00:00

The fifth version of the patch series adding the boot-constraint subsystem is under review on the linux-kernel mailing list. The purpose of this subsystem is to honor the constraints put on devices by the bootloader before those devices are handed over to the operating system (OS) — Linux in our case. If these constraints are violated, devices may fail to work properly once the kernel starts reconfiguring the hardware; by tracking and enforcing those constraints, instead, we can ensure that hardware continues to work properly until the kernel is fully operational.



Security updates for Friday

2018-02-16T15:37:13+00:00

Security updates have been issued by Debian (quagga), Mageia (freetype2, kernel-linus, and kernel-tmb), openSUSE (chromium, GraphicsMagick, mupdf, openssl-steam, and xen), Slackware (irssi), SUSE (glibc and quagga), and Ubuntu (quagga).



[$] Dynamic function tracing events

2018-02-15T23:12:11+00:00

For as long as the kernel has included tracepoints, developers have argued over whether those tracepoints are part of the kernel's ABI. Tracepoint changes have had to be reverted in the past because they broke existing user-space programs that had come to depend on them; meanwhile, fears of setting internal code in stone have made it difficult to add tracepoints to a number of kernel subsystems. Now, a new tracing functionality is being proposed as a way to circumvent all of those problems.



FOSS Project Spotlight: LinuxBoot (Linux Journal)

2018-02-15T20:49:57+00:00

Linux Journal takes a look at the newly announced LinuxBoot project. LWN covered a related talk back in November. "Modern firmware generally consists of two main parts: hardware initialization (early stages) and OS loading (late stages). These parts may be divided further depending on the implementation, but the overall flow is similar across boot firmware. The late stages have gained many capabilities over the years and often have an environment with drivers, utilities, a shell, a graphical menu (sometimes with 3D animations) and much more. Runtime components may remain resident and active after firmware exits. Firmware, which used to fit in an 8 KiB ROM, now contains an OS used to boot another OS and doesn't always stop running after the OS boots. LinuxBoot replaces the late stages with a Linux kernel and initramfs, which are used to load and execute the next stage, whatever it may be and wherever it may come from. The Linux kernel included in LinuxBoot is called the 'boot kernel' to distinguish it from the 'target kernel' that is to be booted and may be something other than Linux."



Security updates for Thursday

2018-02-15T15:24:41+00:00

Security updates have been issued by Debian (jackson-databind, leptonlib, libvorbis, python-crypto, and xen), Fedora (apache-commons-email, ca-certificates, libreoffice, libxml2, mujs, p7zip, python-django, sox, and torbrowser-launcher), openSUSE (libreoffice), SUSE (libreoffice), and Ubuntu (advancecomp, erlang, and freetype).



[$] LWN.net Weekly Edition for February 15, 2018

2018-02-15T00:34:37+00:00

The LWN.net Weekly Edition for February 15, 2018 is available.



[$] DIY biology

2018-02-14T21:52:23+00:00

A scientist with a rather unusual name, Meow-Ludo Meow-Meow, gave a talk at linux.conf.au 2018 about the current trends in "do it yourself" (DIY) biology or "biohacking". He is perhaps most famous for being prosecuted for implanting an Opal card RFID chip into his hand; the Opal card is used for public transportation fares in Sydney. He gave more details about his implant as well as describing some other biohacking projects in an engaging presentation.




Wielaard: dtrace for linux; Oracle does the right thing

2018-02-14T20:04:07+00:00

Mark Wielaard writes about the recently discovered relicensing of the dtrace dynamic tracing subsystem under the GPL. "Thank you Oracle for making everyone’s life easier by waving your magic relicensing wand! Now there is lots of hard work to do to actually properly integrate this. And I am sure there are a lot of technical hurdles when trying to get this upstreamed into the mainline kernel. But that is just hard work. Which we can now start collaborating on in earnest."



[$] A report from the Enigma conference

2018-02-14T18:50:02+00:00

The 2018 USENIX Enigma conference was held for the third time in January. Among many interesting talks, three presentations dealing with human security behaviors stood out. This article covers the key messages of these talks, namely the finding that humans are social in their security behaviors: their decision to adopt a good security practice is hardly ever an isolated decision.

Subscribers can read on for the report by guest author Christian Folini.




[$] Authentication and authorization in Samba 4

2018-02-14T18:03:16+00:00

Volker Lendecke is one of the first contributors to Samba, having submitted his first patches in 1994. In addition to developing other important file-sharing tools, he's heavily involved in development of the winbind service, which is implemented in winbindd. Although the core Active Directory (AD) domain controller (DC) code was written by his colleague Stefan Metzmacher, winbind is a crucial component of Samba's AD functionality. In his information-packed talk at FOSDEM 2018, Lendecke said he aimed to give a high-level overview of what AD and Samba authentication is, and in particular the communication pathways and trust relationships between the parts of Samba that authenticate a Samba user in an AD environment.




Security updates for Wednesday

2018-02-14T16:11:31+00:00

Security updates have been issued by Arch Linux (exim and mpv), Debian (advancecomp and graphicsmagick), Red Hat (collectd, erlang, httpd24-apr, openstack-aodh, and openstack-nova), SUSE (kernel and xen), and Ubuntu (libvorbis).



[$] Two FOSDEM talks on Samba 4

2018-02-13T19:31:07+00:00

Much as some of us would love never to have to deal with Windows, it exists. It wants to authenticate its users and share resources like files and printers over the network. Although many enterprises use Microsoft tools to do this, there is a free alternative, in the form of Samba. While Samba 3 has been happily providing authentication along with file and print sharing to Windows clients for many years, the Microsoft world has been slowly moving toward Active Directory (AD). Meanwhile, Samba 4, which adds a free reimplementation of AD on Linux, has been increasingly ready for deployment. Three short talks at FOSDEM 2018 provided three different views of Samba 4, also known as Samba-AD, and left behind a pretty clear picture that Samba 4 is truly ready for use.

Subscribers can read on for a report from guest author Tom Yates on the first two of those talks; stay tuned for another on the third soon.




Stable kernel updates

2018-02-13T16:28:21+00:00

Stable kernels 4.15.3, 4.14.19, and 4.9.81 have been released. They all contain important fixes and users should upgrade.