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Re: [PATCH v1 3/3] cgroup: relax common ancestor restriction for direct descendants

From Tejun Heo <tj@kernel.org>
Newsgroups linux.kernel
Subject Re: [PATCH v1 3/3] cgroup: relax common ancestor restriction for direct descendants
Date 2016-07-21 17:10 +0200
Message-ID <rXnLP-DS-13@gated-at.bofh.it> (permalink)
References (5 earlier) <rX8Wt-7Sc-1@gated-at.bofh.it> <rX8Wu-7Sc-3@gated-at.bofh.it> <rXgU1-4ur-19@gated-at.bofh.it> <rXniN-cH-9@gated-at.bofh.it> <rXniN-cH-7@gated-at.bofh.it>
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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

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Thread

[PATCH v1 0/3] cgroup: allow for unprivileged management Aleksa Sarai <asarai@suse.de> - 2016-07-18 18:20 +0200
  [PATCH v1 3/3] cgroup: relax common ancestor restriction for direct descendants Aleksa Sarai <asarai@suse.de> - 2016-07-18 18:20 +0200
    Re: [PATCH v1 3/3] cgroup: relax common ancestor restriction for  direct descendants Tejun Heo <tj@kernel.org> - 2016-07-20 18:00 +0200
      Re: [PATCH v1 3/3] cgroup: relax common ancestor restriction for  direct descendants Aleksa Sarai <asarai@suse.de> - 2016-07-21 01:00 +0200
        Re: [PATCH v1 3/3] cgroup: relax common ancestor restriction for  direct descendants Tejun Heo <tj@kernel.org> - 2016-07-21 01:10 +0200
          Re: [PATCH v1 3/3] cgroup: relax common ancestor restriction for  direct descendants Aleksa Sarai <asarai@suse.de> - 2016-07-21 01:20 +0200
            Re: [PATCH v1 3/3] cgroup: relax common ancestor restriction for  direct descendants Tejun Heo <tj@kernel.org> - 2016-07-21 01:20 +0200
              Re: [PATCH v1 3/3] cgroup: relax common ancestor restriction for  direct descendants Aleksa Sarai <asarai@suse.de> - 2016-07-21 09:50 +0200
                Re: [PATCH v1 3/3] cgroup: relax common ancestor restriction for  direct descendants Aleksa Sarai <asarai@suse.de> - 2016-07-21 16:40 +0200
                Re: [PATCH v1 3/3] cgroup: relax common ancestor restriction for  direct descendants Tejun Heo <tj@kernel.org> - 2016-07-21 17:10 +0200
                Re: [PATCH v1 3/3] cgroup: relax common ancestor restriction for  direct descendants "Serge E. Hallyn" <serge@hallyn.com> - 2016-07-21 17:10 +0200
                Re: [PATCH v1 3/3] cgroup: relax common ancestor restriction for  direct descendants "Serge E. Hallyn" <serge@hallyn.com> - 2016-07-21 16:40 +0200
                Re: [PATCH v1 3/3] cgroup: relax common ancestor restriction for  direct descendants James Bottomley <James.Bottomley@HansenPartnership.com> - 2016-07-21 17:00 +0200
                Re: [PATCH v1 3/3] cgroup: relax common ancestor restriction for  direct descendants Tejun Heo <tj@kernel.org> - 2016-07-21 17:00 +0200
                Re: [PATCH v1 3/3] cgroup: relax common ancestor restriction for  direct descendants Aleksa Sarai <asarai@suse.de> - 2016-07-21 17:10 +0200
                Re: [PATCH v1 3/3] cgroup: relax common ancestor restriction for  direct descendants Tejun Heo <tj@kernel.org> - 2016-07-21 17:10 +0200
                Re: [PATCH v1 3/3] cgroup: relax common ancestor restriction for  direct descendants Tejun Heo <tj@kernel.org> - 2016-07-21 17:00 +0200
                Re: [PATCH v1 3/3] cgroup: relax common ancestor restriction for  direct descendants James Bottomley <James.Bottomley@HansenPartnership.com> - 2016-07-21 17:10 +0200
                Re: [PATCH v1 3/3] cgroup: relax common ancestor restriction for  direct descendants Tejun Heo <tj@kernel.org> - 2016-07-21 17:10 +0200
                Re: [PATCH v1 3/3] cgroup: relax common ancestor restriction for  direct descendants James Bottomley <James.Bottomley@HansenPartnership.com> - 2016-07-21 17:20 +0200
                Re: [PATCH v1 3/3] cgroup: relax common ancestor restriction for  direct descendants Tejun Heo <tj@kernel.org> - 2016-07-21 17:30 +0200
                Re: [PATCH v1 3/3] cgroup: relax common ancestor restriction for  direct descendants James Bottomley <James.Bottomley@HansenPartnership.com> - 2016-07-21 17:40 +0200
                Re: [PATCH v1 3/3] cgroup: relax common ancestor restriction for  direct descendants Tejun Heo <tj@kernel.org> - 2016-07-21 18:00 +0200
                Re: [PATCH v1 3/3] cgroup: relax common ancestor restriction for  direct descendants James Bottomley <James.Bottomley@HansenPartnership.com> - 2016-07-21 20:20 +0200
                Re: [PATCH v1 3/3] cgroup: relax common ancestor restriction for  direct descendants Tejun Heo <tj@kernel.org> - 2016-07-21 23:10 +0200
                Re: [PATCH v1 3/3] cgroup: relax common ancestor restriction for  direct descendants Aleksa Sarai <asarai@suse.de> - 2016-07-22 10:30 +0200
                Re: [PATCH v1 3/3] cgroup: relax common ancestor restriction for  direct descendants Tejun Heo <tj@kernel.org> - 2016-07-25 20:40 +0200
                Re: [PATCH v1 3/3] cgroup: relax common ancestor restriction for  direct descendants Aleksa Sarai <asarai@suse.de> - 2016-07-22 10:20 +0200
                Re: [PATCH v1 3/3] cgroup: relax common ancestor restriction for  direct descendants Tejun Heo <tj@kernel.org> - 2016-07-25 20:50 +0200

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