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From: Vagrant Cascadian <vagrant@debian.org>
To: zimoun <zimon.toutoune@gmail.com>,
	"Ludovic Courtès" <ludo@gnu.org>, "Marius Bakke" <marius@gnu.org>
Cc: Guix Devel <guix-devel@gnu.org>,
	45069@debbugs.gnu.org,
	Paul Garlick <pgarlick@tourbillion-technology.com>,
	Jesse Dowell <jesse.dowell@gmail.com>
Subject: Re: bug#45069: Guix System: unprivileged user cannot create user namespaces?
Date: Mon, 07 Dec 2020 09:55:31 -0800	[thread overview]
Message-ID: <87eek1sdpo.fsf@yucca> (raw)
In-Reply-To: <86ft4h5xjz.fsf@gmail.com>

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On 2020-12-07, zimoun wrote:
> On Mon, 07 Dec 2020 at 18:13, Pierre Neidhardt <mail@ambrevar.xyz> wrote:
>
>>> Can you try, as root on Guix System:
>>>
>>> $ echo 1 > /proc/sys/kernel/unprivileged_userns_clone
>>
>> # echo 1 > /proc/sys/kernel/unprivileged_userns_clone
>> -bash: /proc/sys/kernel/unprivileged_userns_clone: No such file or directory
>
> In gnu/build/linux-container.scm, it reads:
>
> --8<---------------cut here---------------start------------->8---
> (define (unprivileged-user-namespace-supported?)
>   "Return #t if user namespaces can be created by unprivileged users."
>   (let ((userns-file "/proc/sys/kernel/unprivileged_userns_clone"))
>     (if (file-exists? userns-file)
>         (eqv? #\1 (call-with-input-file userns-file read-char))
>         #t)))
> --8<---------------cut here---------------end--------------->8---
>
> Does it mean that the Linux kernel on Guix System does not support
> namespaces by unprivileged users?

> Turning #t to #f should work on Guix System and it appears to me a
> severe bug if not.  What do I miss?  Please could someone fill my gap? :-)

The /proc/sys/kernel_unprivileged_userns_clone file is specific to
Debian and Ubuntu packaged linux kernel; it is a patchset not applied
upstream, as far as I am aware. I'm not sure if other distros support
disabling and enabling this feature using this mechanism.

  https://salsa.debian.org/kernel-team/linux/-/blob/master/debian/patches/debian/add-sysctl-to-disallow-unprivileged-CLONE_NEWUSER-by-default.patch

live well,
  vagrant

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  reply	other threads:[~2020-12-07 17:58 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-04 15:52 guix environment: error: cannot create container: unprivileged user cannot create user namespaces yasu
2020-12-04 16:04 ` Ricardo Wurmus
2020-12-04 16:29   ` Yasuaki Kudo
2020-12-04 16:32 ` zimoun
2020-12-04 18:55   ` Pjotr Prins
2020-12-04 20:44     ` Yasuaki Kudo
2020-12-05  0:20     ` yasu
2020-12-06 12:41       ` BUG: " yasu
2020-12-06 16:16         ` bug#45069: " Tobias Geerinckx-Rice via Bug reports for GNU Guix
2020-12-06 16:56         ` zimoun
2020-12-06 20:51           ` yasu
2021-01-06 10:49             ` raingloom
2020-12-06 20:54           ` bug#45069: " Jesse Dowell
2020-12-07 11:57             ` Pierre Neidhardt
2020-12-07 12:29               ` Paul Garlick
2020-12-07 12:41                 ` Yasuaki Kudo
2020-12-07 17:13                 ` Pierre Neidhardt
2020-12-07 17:35                   ` bug#45069: Guix System: unprivileged user cannot create user namespaces? zimoun
2020-12-07 17:55                     ` Vagrant Cascadian [this message]
2020-12-07 20:03                       ` zimoun
2020-12-08  3:20                       ` Bengt Richter
2020-12-07 19:50                   ` bug#45069: BUG: Re: guix environment: error: cannot create container: unprivileged user cannot create user namespaces Paul Garlick
2020-12-07 20:35                     ` Pierre Neidhardt
2020-12-07 21:09                       ` zimoun
2021-01-04  9:11                       ` Pierre Neidhardt
2020-12-07 13:26               ` zimoun

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