Linux-libre kernel 3.0.66-1 booting
|Company / developer||Free Software Foundation Latin America|
|Programmed in||C and Assembly|
|Initial release||February 20, 2008|
|Latest stable release||3.12.6-gnu / December 20, 2013|
Linux-libre (/ /) is an operating system kernel and a GNU package  that is maintained from modified versions of the Linux kernel. The aim of the project is to remove any software that does not include its source code, has its source code obfuscated or released under proprietary licenses from the Linux kernel. The parts that have no source code are called binary blobs and are generally proprietary firmware which, while generally redistributable, generally do not give the user the freedom to modify or study them. Linux-libre is a prominent example of free software.
Linux started including binary blobs in 1996. The work to clear out the binary blobs began in 2006 with gNewSense's find-firmware and gen-kernel. This work was taken further by BLAG in 2007 with deblob and Linux-libre was born. Linux-libre was first released by the Free Software Foundation Latin America (FSFLA), then endorsed by the Free Software Foundation as a valuable component for the totally free Linux distributions. It became a GNU package on March 2012. Alexandre Oliva is the project maintainer.
Method of proprietary firmware removal
The removal process is achieved by using a script called deblob-main. This script is inspired by the one used for gNewSense. Jeff Moe made subsequent modifications to meet certain requirements for its use with the BLAG Linux and GNU distribution. There is another script called deblob-check, which is used to check if a kernel source file, a patch or a compressed sources file still contains software which is suspected of being proprietary.
Effects of removing proprietary firmware
Aside from the primary intended effect of running a system with only free software, the practical consequences of removing device firmware that a user is not allowed to study or modify has both positive and negative effects.
Advantages include the removal of device firmware which cannot be audited for bugs and security problems, or fixed by the Linux kernel maintainers themselves even if they know of them. It is possible for the entire system to be compromised by a malicious firmware, and without the ability to perform a security audit on manufacturer-provided firmware. Even an innocent bug could undermine the safety of the running system.
The downside of removing proprietary firmware from the kernel is that it will cause loss of functionality of certain hardware that does not have a free software replacement available. This affects certain sound, video, TV tuner, and network cards, as well as some other devices. When possible, free software replacement firmware is provided as a substitute.
The source code and precompiled packages of the deblobbed Linux kernel are available directly from the distributions which use the Linux-Libre scripts. Freed-ora is a subproject which prepares and maintains RPM packages based on the Fedora kernel. There are also precompiled packages for Debian and derived distributions such as Ubuntu.
Distributions in which Linux-libre is the default kernel used:
- Parabola GNU/Linux-libre
- See also List of Linux distributions endorsed by the Free Software Foundation
Distributions in which Linux is the default kernel used and which propose Linux-libre as alternate kernel:
The kernel of the dyne:bolic distribution has been compiled to work in real-time, giving it better performance for multimedia editing and other tasks which require hard latency guarantees. In addition, a real-time kernel is available in Trisquel and Parabola as an optional download.
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- "ftp://musix.ourproject.org/pub/musix/deb/kernel/2.6.26-libre-rt" [Index of ftp://musix.ourproject.org/]. Índice de ftp://musix.ourproject.org/ (in Castilian). Retrieved December 6, 2011.
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- "http://repo.parabolagnulinux.org/kernels/os/i686/". Index of http://repo.parabolagnulinux.org/kernels/os/i686/. Retrieved December 6, 2011.
|Wikimedia Commons has media related to Linux-libre.|
- Official website
- Linux (BLOB free version) at FSF.org
- Free Software Corsica official .deb builder for the Free Software Latino America since 2010