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Linux 5.17-rc8

Submitted by Roy Schestowitz on Sunday 13th of March 2022 09:33:32 PM Filed under
Linux

So last weekend, I thought I'd be releasing the final 5.17 today.

That was then, this is now. Last week was somewhat messy, mostly
because of embargoed patches we had pending with another variation of
spectre attacks.  And while the patches were mostly fine, we had the
usual "because it was hidden, all our normal testing automation didn't
see it either".

And once the automation sees things, it tests all the insane
combinations that people don't tend to actually use or test in any
normal case, and so there was a (small) flurry of fixes for the fixes.

None of this was really surprising, but I naïvely thought I'd be able
to do the final release this weekend anyway.

And honestly, I considered it. I don't think we really have any
pending issues that would hold up a release, but on the other hand we
also really don't have any reason _not_ to give it another week with
all the proper automated testing.  So that's what I'm doing, and as a
result we have an -rc8 release today instead of doing a final 5.17.

There's a number of non-spectre things in here too, of course. Among
other things, people finally chased down a couple of mislaid patches
that had been on the regression list, so hopefully we have those all
nailed down now too.

And obviously there's all the usual random fixes in here too. But
because of the spectre thing, about half of the -rc8 patch is
architecture updates.

That said, it's still a fairly _small_ half of the patch. It was not
one of the "big disaster" hw speculation things, it was mostly
extending existing mitigations and reporting.

Anyway, let's not keep the testing _just_ to automation - the more the
merrier, and real-life loads are always more interesting than what the
automation farms do. So please do give this last rc a quick try,

                    Linus

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Also: ReiserFS may Lose Support in Linux Kernel

»

Kernel prepatch 5.17-rc8 [LWN.net]

Submitted by Roy Schestowitz on Monday 14th of March 2022 12:37:28 AM.

Linus Torvalds ponders limits of automation as kernel release...

Submitted by Roy Schestowitz on Monday 14th of March 2022 08:49:39 AM.
  • Linus Torvalds ponders limits of automation as kernel release delayed

    Linux kernel development boss Linus Torvalds's prediction that Linux 5.17 would be released this week "unless something surprising comes up" has come to pass. Not in the good way.

    The surprise was CVE-2021-26341 – a flaw in some AMD processors found to have new Spectre-and-Meltdown-like speculative execution issues. AMD has described the flaw as meaning its processors "may transiently execute instructions following an unconditional direct branch that may result in detectable cache activity."

    While the flaw was rated just 4.7/10 on the CVSS scale and AMD could not find any active exploitation, the chipmaker warned the problem is present in 14 client CPUs and first- and second-gen EPYC silicon for servers. The issue was detected in October 2021 and detailed by Grsecurity, which after disclosure worked to deliver a fix by February 8 but later agreed to an extended deadline of March 8.

Linux Kernel 5.17 Delayed by a Week to Tackle Spectre v2 Exploit

Submitted by Roy Schestowitz on Monday 14th of March 2022 09:00:38 AM.
  • Linux Kernel 5.17 Delayed by a Week to Tackle Spectre v2 Exploit

    Linux Kernel 5.17 was scheduled to release the previous day (Sunday).

    Unfortunately, (or for better), Spectre V2, another variant of the Spectre vulnerability affecting the processors, was discovered.

    But, what is the Spectre v2 vulnerability affecting the chips? Is it essential for the Linux Kernel 5.17 to include a fix?

Linux 5.17 delayed after vulnerability discovered in AMD process

Submitted by Rianne Schestowitz on Monday 14th of March 2022 07:06:26 PM.
  • Linux 5.17 delayed after vulnerability discovered in AMD processors

    The resurgence of Spectre-like malware has pushed the release date for the next iteration of Linux for at least a week, its creator has confirmed.

    In the 5.17-rc8 announcement, the kernel development head Linus Torvalds explained that the discovery of CVE-2021-26341 - a vulnerability in some AMD processors that resembles the dreaded Spectre/Meltdown fiasco, meant the team needed to apply certain patches, which complicated things for the 5.17 version of the OS.

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