From: Tejun Heo <tj@kernel.org>
To: Aleksa Sarai <asarai@suse.de>
Cc: "Serge E. Hallyn" <serge@hallyn.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Li Zefan <lizefan@huawei.com>,
Johannes Weiner <hannes@cmpxchg.org>,
"Serge E. Hallyn" <serge.hallyn@ubuntu.com>,
Aditya Kali <adityakali@google.com>,
Chris Wilson <chris@chris-wilson.co.uk>,
linux-kernel@vger.kernel.org, cgroups@vger.kernel.org,
Christian Brauner <cbrauner@suse.de>,
dev@opencontainers.org,
James Bottomley <James.Bottomley@hansenpartnership.com>
Subject: Re: [PATCH v1 3/3] cgroup: relax common ancestor restriction for direct descendants
Date: Thu, 21 Jul 2016 11:01:35 -0400 [thread overview]
Message-ID: <20160721150135.GD22680@htj.duckdns.org> (raw)
In-Reply-To: <2dc90947-cee7-90a9-3e60-4ca7c0de29d3@suse.de>
Hello, Aleksa.
On Fri, Jul 22, 2016 at 12:37:42AM +1000, Aleksa Sarai wrote:
> > Ths is of course solvable using something like libpam-cgfs or
> > libpam-cgm (and others). Since this sounds like a question of
> > policy, not mechanism, userspace seems like the right place. Is
> > there a downside to that (or, as Tejun put it, "delegating explicitly")?
>
> Having a PAM module requires getting an administrator to install the PAM
> module (and also presumably audit it, not to mention convincing them that
> your requirement to use containers are significant enough for them to do any
> work). It's the same problem IMO. I understand that LXC allows you to do
> this, but it requires that you get an administrator to *install* and support
> LXC (as well as the shadow-utils setuid binaries too). There are cases where
> you don't have the freedom to do that, and also "just get someone to give
> you privileges temporarily" is again punting on the problem.
The administrator has to install a new kernel to get this feature from
kernel side too. I don't think "to bypass admin" is a strong argument
for a new kernel feature especially when it's likely to cause subtle
issues as in this case.
Thanks.
--
tejun
next prev parent reply other threads:[~2016-07-21 15:02 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-18 16:18 [PATCH v1 0/3] cgroup: allow for unprivileged management Aleksa Sarai
2016-07-18 16:18 ` [PATCH v1 1/3] kernfs: add support for custom per-sb permission hooks Aleksa Sarai
2016-07-18 16:18 ` [PATCH v1 2/3] cgroup: allow for unprivileged subtree management Aleksa Sarai
2016-07-20 15:45 ` Tejun Heo
2016-07-20 22:59 ` Aleksa Sarai
2016-07-18 16:18 ` [PATCH v1 3/3] cgroup: relax common ancestor restriction for direct descendants Aleksa Sarai
2016-07-20 15:51 ` Tejun Heo
2016-07-20 22:58 ` Aleksa Sarai
2016-07-20 23:02 ` Tejun Heo
2016-07-20 23:18 ` Aleksa Sarai
2016-07-20 23:19 ` Tejun Heo
2016-07-21 7:49 ` Aleksa Sarai
2016-07-21 14:33 ` Serge E. Hallyn
2016-07-21 14:37 ` Aleksa Sarai
2016-07-21 15:01 ` Tejun Heo [this message]
2016-07-21 15:09 ` Serge E. Hallyn
2016-07-21 14:51 ` James Bottomley
2016-07-21 14:59 ` Tejun Heo
2016-07-21 15:07 ` Aleksa Sarai
2016-07-21 15:04 ` Tejun Heo
2016-07-21 14:52 ` Tejun Heo
2016-07-21 15:04 ` James Bottomley
2016-07-21 15:07 ` Tejun Heo
2016-07-21 15:16 ` James Bottomley
2016-07-21 15:26 ` Tejun Heo
2016-07-21 15:34 ` James Bottomley
2016-07-21 15:50 ` Tejun Heo
2016-07-21 18:16 ` James Bottomley
2016-07-21 21:06 ` Tejun Heo
2016-07-22 8:30 ` Aleksa Sarai
2016-07-25 18:38 ` Tejun Heo
2016-07-25 22:54 ` Serge E. Hallyn
2016-07-22 8:24 ` Aleksa Sarai
2016-07-25 18:44 ` Tejun Heo
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