Linux and GNU
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Analyzing the Linux boot process
The oldest joke in open source software is the statement that "the code is self-documenting." Experience shows that reading the source is akin to listening to the weather forecast: sensible people still go outside and check the sky. What follows are some tips on how to inspect and observe Linux systems at boot by leveraging knowledge of familiar debugging tools. Analyzing the boot processes of systems that are functioning well prepares users and developers to deal with the inevitable failures.
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BPF Getting Error Injection & More In Linux 4.16
While BPF has been under the spotlight recently in light of Spectre, with the upcoming Linux 4.16 cycle this in-kernel virtual machine and originally packet filter will be picking up new features.
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Jailhouse Guest Support Queued For Linux 4.16
Yet more functionality to find with the upcoming Linux 4.16 kernel is the first bits of Jailhouse hypervisor functionality being mainlined.
Since at least 2013 Siemens has been developing the Jailhouse hypervisor for Linux systems. This partitioning hypervisor aims to be lighter than KVM and Siemens has been designing it for "highly demanding real-time, safety or security" workloads.
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Retpoline patch coming to Linux 4.9 and Linux 4.14
Several Linux kernel versions, including 4.9, 4.14, and the upcoming 4.15, will have Retpoline support built in to mitigate against the Spectre vulnerability. Greg Kroah-Hartman, one of the head honchos overlooking kernel development, accepted the patch into the 4.9 and 4.14 kernels meaning Linux users everywhere should be secure from Spectre without any performance hits.
The exact kernel versions to look out for are 4.9.77 and 4.14.14. Unfortunately, for those of us still on Linux 4.4 and 3.18, which are still supported, there is no sign of the Retpoline patch just yet despite getting receiving other updates. Hopefully it’ll be released in a subsequent update after they’ve had time to monitor for any problems in 4.9 and 4.14.
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Retpoline Support Backport Lands In GCC 7
The backporting of -mindirect-branch, -mindirect-return and -mindirect-branch-register, a.k.a. the GCC "Retpoline" patches, have been back-ported and merged into the GCC 7 branch.
Given the severity of the Spectre vulnerability, these features for Retpoline support are being back-ported to GCC branches normally only reserved for bug/regression/documentation fixes.
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Linux kernel mailing list back online; Meltdown and Spectre vulnerabilities; Mobile OS eelo; Barcelona now using Linux
The popular Linux Kernel Mailing List website is back online after going down and staying down for several days due to a power outage to the home server where it was hosted. Upon reboot, a password (for dm-crypt) was required to mount the root device; however, that in itself was not the problem. The problem was the fact that the PC’s owner, Jasper, was on vacation when all of this occurred. Anyway, the site is now back up and continuing to operate as it always has.
Speaking of the kernel mailing lists, Johannes Weiner issued a call for proposals for agenda topics to the upcoming annual 2018 Linux Storage, Filesystem and Memory Management (LSF/MM) Summit. The deadline is January 31, 2018, and the summit will be held between April 23-25 At Deer Valley Lodges in Park City, Utah. For more information, visit the Linux Foundation Events page.
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Documentary films on Linux!
The Code & Revolution OS! Those are documentary films released in 2001. The Code is based on birth and journey of Linux & Revolution OS is based on 20 years journey of Linux, GNU, Open Source world.
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