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Re: [PATCH v5] cgroup: Add new capability to allow a process to migrate other tasks between cgroups

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On Tue, Dec 13, 2016 at 9:17 AM, Casey Schaufler <casey@schaufler-ca.com> wrote:
> On 12/13/2016 8:49 AM, John Stultz wrote:
>> On Tue, Dec 13, 2016 at 8:39 AM, Casey Schaufler <casey@schaufler-ca.com> wrote:
>>> On 12/13/2016 1:47 AM, Michael Kerrisk (man-pages) wrote:
>>>> How about CAP_CGROUP_CONTROL or some such, with the idea that this
>>>> might be a capability that allows the holder to step outside usual
>>>> cgroup rules? At the moment, that capability would allow only one such
>>>> step, but maybe there would be others in the future.
>>> I agree, but want to put it more strongly. The granularity of
>>> capabilities can never be fine enough for some people, and this
>>> is an example of a case where you're going a bit too far. If the
>>> use case is Android as you say, you don't need this. As my friends
>>> on the far side of the aisle would say, "just write SELinux policy"
>>> to correctly control access as required.
>> So.. The trouble is that while selinux is good for restricting
>> permissions, the in-kernel permission checks here are already too
>> restrictive.
>
> Why did the original authors of cgroups make it that restrictive?
> If there isn't a good reason, loosen it up. If there is a good
> reason, then pay heed to it.

That's what this patch is proposing. And I agree with Michael that the
newly proposed cap was a bit to narrowly focused on my immediate use
case, and broadening it to CGROUP_CONTROL is smart. Then that
capability could be further restricted w/ selinux policy, as you
suggest.

thanks
-john

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[PATCH v5] cgroup: Add new capability to allow a process to migrate other tasks between cgroups John Stultz <john.stultz@linaro.org> - 2016-12-13 02:40 +0100
  Re: [PATCH v5] cgroup: Add new capability to allow a process to  migrate other tasks between cgroups John Stultz <john.stultz@linaro.org> - 2016-12-13 02:50 +0100
  Re: [PATCH v5] cgroup: Add new capability to allow a process to  migrate other tasks between cgroups "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com> - 2016-12-13 10:50 +0100
    Re: [PATCH v5] cgroup: Add new capability to allow a process to  migrate other tasks between cgroups John Stultz <john.stultz@linaro.org> - 2016-12-13 17:30 +0100
      Re: [PATCH v5] cgroup: Add new capability to allow a process to  migrate other tasks between cgroups John Stultz <john.stultz@linaro.org> - 2016-12-13 19:50 +0100
        Re: [PATCH v5] cgroup: Add new capability to allow a process to  migrate other tasks between cgroups Tejun Heo <tj@kernel.org> - 2016-12-13 20:00 +0100
      Re: [PATCH v5] cgroup: Add new capability to allow a process to  migrate other tasks between cgroups Tejun Heo <tj@kernel.org> - 2016-12-13 19:50 +0100
    Re: [PATCH v5] cgroup: Add new capability to allow a process to  migrate other tasks between cgroups Casey Schaufler <casey@schaufler-ca.com> - 2016-12-13 17:40 +0100
      Re: [PATCH v5] cgroup: Add new capability to allow a process to  migrate other tasks between cgroups John Stultz <john.stultz@linaro.org> - 2016-12-13 18:00 +0100
        Re: [PATCH v5] cgroup: Add new capability to allow a process to  migrate other tasks between cgroups Casey Schaufler <casey@schaufler-ca.com> - 2016-12-13 18:20 +0100
          Re: [PATCH v5] cgroup: Add new capability to allow a process to  migrate other tasks between cgroups John Stultz <john.stultz@linaro.org> - 2016-12-13 18:40 +0100
            Re: [PATCH v5] cgroup: Add new capability to allow a process to  migrate other tasks between cgroups Casey Schaufler <casey@schaufler-ca.com> - 2016-12-13 18:50 +0100
              Re: [PATCH v5] cgroup: Add new capability to allow a process to  migrate other tasks between cgroups John Stultz <john.stultz@linaro.org> - 2016-12-13 19:20 +0100
                Re: [PATCH v5] cgroup: Add new capability to allow a process to  migrate other tasks between cgroups Casey Schaufler <casey@schaufler-ca.com> - 2016-12-13 19:40 +0100
                Re: [PATCH v5] cgroup: Add new capability to allow a process to  migrate other tasks between cgroups Tejun Heo <tj@kernel.org> - 2016-12-13 19:50 +0100

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