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Cygon
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PostPosted: Wed Oct 31, 2018 12:32 pm    Post subject: Oldest Kernel Supported by Gentoo Reply with quote

I'm running Gentoo inside LXC containers (the kernel namespace isolation stuff from Docker, just without the file system overlays) on my QNAP NAS. Sadly, QNAP is not upgrading their kernels very often, so currently they're at mainline 4.2.8 equivalent.

Can I look up the minimum kernel version Gentoo officially supports somewhere?

I have no issues running a Gentoo system from all the latest ebuilds at the moment, but I'd like to have a way to tell when the old kernel becomes a problem. The oldest kernel I see in sys-kernel/gentoo-sources is 4.1.43 (though that probably says little about whether it's still supported).
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Naib
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PostPosted: Wed Oct 31, 2018 12:45 pm    Post subject: Reply with quote

https://packages.gentoo.org/packages/sys-kernel/gentoo-sources

There is also a number of other patchsets, including vanilla
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Hu
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PostPosted: Thu Nov 01, 2018 1:21 am    Post subject: Reply with quote

Based on the announcements from the upstream kernel maintainers, I think kernel v4.2.8 became a problem around when v4.3.1 came out. Your current kernel is the newest in its stable series, but was released in December 2015 and the v4.2.x line is long abandoned. That means it is missing all security related fixes implemented subsequent to that time. If untrusted users are able to interact with this system, I strongly suggest updating it to a newer kernel.

To address your question, the most likely thing to break due to an old kernel will be glibc. With some luck, it will break when a sanity test fails during the build, rather than letting you install a version that cannot run on your current kernel.
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josephg
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PostPosted: Thu Nov 01, 2018 10:59 am    Post subject: Reply with quote

What does "Gentoo supported" actually mean to you? Surely, you're not going to sue Gentoo if anything breaks. Do your own due diligence, and test before you do anything in production. The oldest LTS kernel supported by the linux kernel maintainers is 3.16 which should get security updates till 2020 eol. You could apply the gentoo patches yourself, if need be. Your kernel 4.1.43 is neither supported by linux kernel maintainers nor by gentoo kernel maintainers.
http://kernel.org/category/releases.html
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NeddySeagoon
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PostPosted: Thu Nov 01, 2018 8:05 pm    Post subject: Reply with quote

Cygon,

If a gentoo-sources kernel has a stable keyword for your arch, its supported. e.g.
Code:
/usr/portage/sys-kernel/gentoo-sources $ grep " amd64" *
gentoo-sources-4.14.65.ebuild:KEYWORDS="alpha amd64 ~arm ~arm64 hppa ia64 ~mips ppc ppc64 ~s390 ~sh ~sparc x86"
gentoo-sources-4.4.150.ebuild:KEYWORDS="alpha amd64 ~arm ~arm64 hppa ia64 ~mips ppc ppc64 ~s390 ~sh ~sparc x86"
gentoo-sources-4.9.122.ebuild:KEYWORDS="alpha amd64 ~arm ~arm64 hppa ia64 ~mips ppc ppc64 ~s390 ~sh ~sparc x86"


"Supported" can mean that what an issue arises the support may mean that it gets dropped. so I'm not sure what this tells you.

Note that in my example, the kernels are all LTS versions on kernel.org.
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