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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.
Updated: 3 hours 45 min ago

Garrett: Reducing power consumption on Haswell and Broadwell systems

Monday 27th of April 2015 08:44:15 PM
Matthew Garrett looked into why Linux systems consume too much power on recent Intel chipsets and wrote up his results — a reduction of idle power use on his laptop from 8.5W to 5W. "This trend is likely to continue. As systems become more integrated we're going to have to pay more attention to the interdependencies in order to obtain the best possible power consumption, and that means that distribution vendors are going to have to spend some time figuring out what these dependencies are and what the appropriate default policy is for their users."

Security advisories for Monday

Monday 27th of April 2015 05:18:43 PM

Arch Linux has updated curl (multiple vulnerabilities) and wpa_supplicant (code execution).

Debian has updated chromium-browser (multiple vulnerabilities), kernel (multiple vulnerabilities), libreoffice (code execution), openjdk-6 (multiple vulnerabilities), openjdk-7 (multiple vulnerabilities), and wpa (code execution).

Fedora has updated cherokee (F21; F20: authentication bypass), chrony (F20: multiple vulnerabilities), php (F20: multiple vulnerabilities), qt5-qtbase (F21; F20: multiple vulnerabilities), resteasy (F20: XML eXternal Entity (XXE) attacks), spatialite-tools (F20: multiple vulnerabilities), sqlite (F20: multiple vulnerabilities), wesnoth (F21; F20: information leak), wpa_supplicant (F21: code execution), and zarafa (F21; F20: denial of service).

Mageia has updated php (three vulnerabilities) and wordpress (multiple vulnerabilities).

Mandriva has updated asterisk (MBS1.0: SSL server spoofing), glusterfs (MBS2.0: denial of service), librsync (MBS1.0: file checksum collision), perl-Module-Signature (MBS1.0: multiple vulnerabilities), php (MBS1.0, MBS2.0: multiple vulnerabilities), qemu (MBS1.0, MBS2.0: denial of service), setup (MBS2.0: information disclosure), and tor (MBS1.0: denial of service).

openSUSE has updated java-1_7_0-openjdk (13.2: multiple vulnerabilities), java-1_8_0-openjdk (13.2: multiple vulnerabilities), and ntp (13.2, 13.1: two vulnerabilities).

Ubuntu has updated autofs (14.10: privilege escalation), libreoffice (14.10, 14.04, 12.04: two vulnerabilities), and tcpdump (14.10, 14.04, 12.04: multiple vulnerabilities).

Kernel prepatch 4.1-rc1

Monday 27th of April 2015 01:36:21 AM
The 4.1-rc1 prepatch is out. Linus says: "No earth-shattering new features come to mind, even if initial support for ACPI on arm64 looks funny. Depending on what you care about, your notion of 'big new feature' may differ from mine, of course. There's a lot of work all over, and some of it might just make a big difference to your use cases." What he doesn't mention is that, in the end, kdbus was not merged for this development cycle.

Debian 8 "Jessie" released

Sunday 26th of April 2015 03:42:49 AM
Debian 8, codenamed "Jessie", has been released. It comes with a wide array of upgraded packages including GNOME 3.14, KDE Plasma Workspaces and KDE Applications 4.11.13, Python 2.7.9 and 3.4.2, Perl 5.20.2, PHP 5.6.7, PostgreSQL 9.4.1, MariaDB 10.0.16 and MySQL 5.5.42, Linux 3.16.7-ctk9, and lots more. "With this broad selection of packages and its traditional wide architecture support, Debian once again stays true to its goal of being the universal operating system. It is suitable for many different use cases: from desktop systems to netbooks; from development servers to cluster systems; and for database, web, or storage servers. At the same time, additional quality assurance efforts like automatic installation and upgrade tests for all packages in Debian's archive ensure that "Jessie" fulfills the high expectations that users have of a stable Debian release."

Rust Once, Run Everywhere

Friday 24th of April 2015 07:24:39 PM

The Rust blog has posted a guide to using Rust's foreign function interface (FFI) with C code. Highlighted in particular are Rust's safe abstractions, which are said to impose no costs. "Most features in Rust tie into its core concept of ownership, and the FFI is no exception. When binding a C library in Rust you not only have the benefit of zero overhead, but you are also able to make it safer than C can! Bindings can leverage the ownership and borrowing principles in Rust to codify comments typically found in a C header about how its API should be used."

Friday's security updates

Friday 24th of April 2015 02:59:12 PM

Arch Linux has updated powerdns (denial of service) and powerdns-recursor (denial of service).

Debian-LTS has updated subversion (multiple vulnerabilities).

Fedora has updated lcms (F20: denial of service) and php (F21: multiple vulnerabilities).

Mageia has updated chromium-browser-stable (M4: multiple vulnerabilities), chrony (M4: multiple vulnerabilities), lftp (M4: SSL server spoofing), libksba (M4: denial of service), ntop (M4: cross-site scripting), setup (M4: information disclosure), and t1utils (M4: multiple vulnerabilities).

openSUSE has updated firefox (13.1; 13.2: code execution) and socat (13.1: denial of service).

Oracle has updated kernel (kernel 3.8.18 (O6, O7); kernel 2.6.39 (O5, O6); kernel 2.6.32 (O5, O6): multiple vulnerabilities).

Red Hat has updated novnc (RHEL OSP4: VNC session hijacking).

Ubuntu has updated firefox (code execution), usb-creator (12.04, 14.04, 14.10; 15.04: privilege escalation), and wpa_supplicant (14.04, 14.10: code execution).

Ubuntu 15.04 (Vivid Vervet) released

Thursday 23rd of April 2015 05:12:34 PM
The Ubuntu 15.04 release is out. "Ubuntu Server 15.04 includes the Kilo release of OpenStack, alongside deployment and management tools that save devops teams time when deploying distributed applications - whether on private clouds, public clouds, x86 or ARM servers, or on developer laptops. Several key server technologies, from MAAS to Ceph, have been updated to new upstream versions with a variety of new features. This release also includes the first release of snappy Ubuntu Core, a new distribution model based on transactional updates." LWN looked at Snappy in January.

Wi-Fi software security bug could leave Android, Windows, Linux open to attack (Ars Technica)

Thursday 23rd of April 2015 02:09:31 PM
Ars Technica reports on a wpa_supplicant bug that might leave Linux and other systems open to remote code execution. "That's because the code fails to check the length of incoming SSID information and writes information beyond the valid 32 octets of data to memory beyond the range it was allocated. SSID information 'is transmitted in an element that has a 8-bit length field and potential maximum payload length of 255 octets,' [wpa_supplicant maintainer Jouni] Malinen wrote, and the code 'was not sufficiently verifying the payload length on one of the code paths using the SSID received from a peer device. This can result in copying arbitrary data from an attacker to a fixed length buffer of 32 bytes (i.e., a possible overflow of up to 223 bytes). The overflow can override a couple of variables in the struct, including a pointer that gets freed. In addition, about 150 bytes (the exact length depending on architecture) can be written beyond the end of the heap allocation.'"

Security updates for Thursday

Thursday 23rd of April 2015 01:40:44 PM

Arch Linux has updated glibc (code execution).

Fedora has updated chrony (F21: three vulnerabilities), gnupg2 (F20: denial of service), java-1.7.0-openjdk (F20: unspecified), java-1.8.0-openjdk (F21: unspecified), kernel (F21; F20: denial of service), ntp (F20: two vulnerabilities), python (F20: denial of service from 2013), spatialite-tools (F21: three vulnerabilities), and sqlite (F21: three vulnerabilities).

Oracle has updated kvm (OL5: two vulnerabilities).

[$] LWN.net Weekly Edition for April 23, 2015

Thursday 23rd of April 2015 01:34:20 AM
The LWN.net Weekly Edition for April 23, 2015 is available.

[$] The kdbuswreck

Wednesday 22nd of April 2015 07:41:32 PM
Few readers will have failed to notice by now that the attempted merging of the kdbus interprocess communication system into the 4.1 kernel has failed to go as well as its proponents would have liked. As of this writing, the discussion continues and nothing has been merged. This article constitutes an attempt to derive a bit of light from the massive amounts of heat that have been generated so far, with a specific focus on the issue of metadata and capabilities.

Sourcegraph: A free code search tool for open source developers (Opensource.com)

Wednesday 22nd of April 2015 07:07:28 PM
Opensource.com introduces Sourcegraph. "Sourcegraph is a code search engine and browsing tool that semantically indexes all the open source code available on the web. You can search for code by repository, package, or function and click on fully linked code to read the docs, jump to definitions, and instantly find usage examples. And you can do all of this in your web browser, without having to configure any editor plugin."

Security advisories for Wednesday

Wednesday 22nd of April 2015 05:16:49 PM

Arch Linux has updated firefox (code execution).

CentOS has updated kernel (C6: multiple vulnerabilities), kvm (C5: two vulnerabilities), and qemu-kvm (C6: privilege escalation).

Debian has updated curl (multiple vulnerabilities) and subversion (two vulnerabilities).

Debian-LTS has updated wireshark (multiple vulnerabilities).

Fedora has updated ceph-deploy (F21: information leak), firefox (F20: multiple vulnerabilities), libzip (F21; F20: code execution), mingw-gnutls (F21: denial of service), mingw-libtasn1 (F21; F20: denial of service), openstack-neutron (F20: denial of service), python-virtualenv (F21; F20: insecure software download), qt5-qtwebkit (F21; F20: denial of service), and qtwebkit (F21; F20: denial of service).

openSUSE has updated Chromium (13.2, 13.1: multiple vulnerabilities).

Oracle has updated glibc (OL6: two vulnerabilities), kernel (OL6: multiple vulnerabilities), and qemu-kvm (OL6: privilege escalation).

Red Hat has updated kernel (RHEL5.9: privilege escalation), kvm (RHEL5: two vulnerabilities), and qemu-kvm (RHEL6: privilege escalation).

Scientific Linux has updated kernel (SL6: multiple vulnerabilities), kvm (SL5: two vulnerabilities), and qemu-kvm (SL6: privilege escalation).

Slackware has updated bind (denial of service), gnupg (multiple vulnerabilities), httpd (multiple vulnerabilities), libssh (two vulnerabilities), firefox (multiple vulnerabilities), thunderbird (multiple vulnerabilities), mutt (denial of service), ntp (two vulnerabilities), openssl (multiple vulnerabilities), php (multiple vulnerabilities), ppp (two vulnerabilities), proftpd (unauthenticated copying of files), qt (multiple vulnerabilities), and seamonkey (multiple vulnerabilities).

SUSE has updated mariadb (SLE12: multiple vulnerabilities).

GCC 5.1 released

Wednesday 22nd of April 2015 03:32:15 PM
Version 5.1 of the GNU Compiler Collection is out. "GCC 5.1 is a major release containing substantial new functionality not available in GCC 4.9.x or previous GCC releases." Some of that new functionality includes full C++14 language support, quite a few optimization improvements, partial OpenACC support, OpenMP 4.0 support, an experimental JIT library, and more; see the changelog for details.

How Tor is building a new Dark Net with help from the U.S. military (The Daily Dot)

Tuesday 21st of April 2015 05:52:56 PM
The Daily Dot reports that the Tor project is receiving some funding from the US Defense Advanced Research Projects Agency (DARPA) to improve Tor's hidden services. "The Dark Net road map moving forward is ambitious. Tor plans to double the encryption strength of hidden service’s identity key and to allow offline storage for that key, a major security upgrade. Next-generation hidden services may be run from multiple hosts to better deal with denial of service attacks and high traffic in general, a potentially big power boost that further closes the gap between the Dark Net and normal websites."

Announcing the release of Fedora 22 Beta

Tuesday 21st of April 2015 04:48:29 PM
Fedora 22 Beta has been released. It comes in Workstation, Server, and Cloud editions, as well as several spins. This version replaces yum with DNF for package management, as discussed in this recent LWN article. The Cloud edition features the latest versions of rpm-ostree and rpm-ostree-toolbox and introduces the Atomic command line tool. The Server edition features a new database server role based on PostgreSQL, an updated Cockpit, and XFS as the default filesystem. The Workstation product has also seen a number of enhancements and improvements, including a redesigned GNOME Shell notification system, transitional Wayland support, and much more.

Tuesday's security updates

Tuesday 21st of April 2015 04:07:35 PM

Arch Linux has updated jdk8-openjdk (multiple vulnerabilities), jre8-openjdk (multiple vulnerabilities), jre8-openjdk-headless (multiple vulnerabilities), and tcpdump (denial of service).

CentOS has updated glibc (C6: two vulnerabilities).

Debian-LTS has updated python-django-markupfield (information leak).

Red Hat has updated glibc (RHEL6: two vulnerabilities) and kernel (RHEL6: multiple vulnerabilities).

Scientific Linux has updated glibc (SL6: two vulnerabilities).

SUSE has updated Real Time Linux Kernel (SLERTE11 SP3: multiple vulnerabilities).

Ubuntu has updated mysql-5.5 (14.10, 14.04, 12.04: multiple vulnerabilities), openjdk-6 (12.04, 10.04: multiple vulnerabilities), openjdk-7 (14.10, 14.04: multiple vulnerabilities), and php5 (14.10, 14.04, 12.04, 10.04: multiple vulnerabilities).

The Puppet design philosophy (O'Reilly)

Tuesday 21st of April 2015 01:01:21 PM
O'Reilly has posted an excerpt from Puppet Best Practices, an upcoming book about the Puppet system configuration tool. It's a good place to look for those wanting an introduction to how Puppet works. "Puppet can be somewhat alien to technologists who have a background in automation scripting. Where most of our scripts scripts are procedural, Puppet is declarative. While a declarative language has many major advantages for configuration management, it does impose some interesting restrictions on the approaches we use to solve common problems."

Tschumperlé: My latest ten months working on G’MIC

Tuesday 21st of April 2015 12:46:41 PM
David Tschumperlé has posted an extensive summary of his work on G'MIC, an image-processing tool. One of those projects was comic colorization: "The idea is very simple: Instead of forcing the artist to do all the colorization job by himself, we just ask him to put some colored key-points here and here, inside the different image regions to fill-in. Then, the algorithm tries to guess a probable colorization of the drawing, by analyzing the contours in the image and by interpolating the given colored key-points with respect to these contours." (LWN looked at G'MIC in August 2014).

VMware just created its first Linux OS, and it’s container-friendly (NetworkWorld)

Monday 20th of April 2015 11:31:23 PM
NetworkWorld takes a look at two VMWare projects that are aimed at running containers inside the VM. "VMware has created Photon as an OS that can run in vSphere. VMware says it’s a “lightweight” Linux OS that has only the basic elements required to package applications in containers and run them inside virtual machines. Because of its minimalist feature set, Project Photon is meant to boot up quickly, which is a key advantage of using containers. Project Photon supports many container image platforms, including those from Docker (which is both an open source container runtime and the name of the company that is commercializing it), as well as container images from CoreOS (called “rkt”) and Pivotal (named “Garden”)." VMWare also announced a beta version of Project Lightwave, "which is an identity and access management tool meant to provide an extra security layer for containers."

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