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Re: [RFC][PATCH 0/2] Another pass at Android style loosening of cgroup attach permissions

From "Serge E. Hallyn" <serge@hallyn.com>
Newsgroups linux.kernel
Subject Re: [RFC][PATCH 0/2] Another pass at Android style loosening of cgroup attach permissions
Date 2016-10-04 23:30 +0200
Message-ID <soFrH-88O-5@gated-at.bofh.it> (permalink)
References (1 earlier) <soABH-57P-1@gated-at.bofh.it> <soCk9-6dM-11@gated-at.bofh.it> <soDJf-6Y7-13@gated-at.bofh.it> <soElX-7uV-25@gated-at.bofh.it> <soEFj-7BW-5@gated-at.bofh.it>
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Quoting Tejun Heo (tj@kernel.org):
> Hello, Serge.
> 
> On Tue, Oct 04, 2016 at 03:18:40PM -0500, Serge E. Hallyn wrote:
> > how about changing the GLOBAL_ROOT_UID check with a targeted
> > capability check, like
> > 
> > 	if (!ns_capable(tcred->user_ns, CAP_SYS_NICE) &&
> >             !uid_eq(cred->euid, tcred->uid) &&
> >             !uid_eq(cred->euid, tcred->suid))
> > 		ret = -EACCES;
> > 
> > where the actual capability to use may require some thought.
> 
> Yeah, that's the direction I'm thinking too.  We can't use
> CAP_SYS_NICE in general tho.  Let's see if a dedicated CAP sticks.

One possibility would be to let each cgroup subsystem define
a move_caps capability mask which is required over the target
task.  And add a new CAP_CGROUP which always suffices?

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[RFC][PATCH 0/2] Another pass at Android style loosening of cgroup attach permissions John Stultz <john.stultz@linaro.org> - 2016-10-04 06:50 +0200
  [PATCH 2/2] cgroup: Add a allow_attach policy for Android John Stultz <john.stultz@linaro.org> - 2016-10-04 06:50 +0200
    Re: [PATCH 2/2] cgroup: Add a allow_attach policy for Android John Stultz <john.stultz@linaro.org> - 2016-10-05 21:20 +0200
      Re: [PATCH 2/2] cgroup: Add a allow_attach policy for Android Dmitry Torokhov <dmitry.torokhov@gmail.com> - 2016-10-07 00:50 +0200
        Re: [PATCH 2/2] cgroup: Add a allow_attach policy for Android Dmitry Torokhov <dmitry.torokhov@gmail.com> - 2016-10-07 01:00 +0200
    Re: [PATCH 2/2] cgroup: Add a allow_attach policy for Android Dmitry Torokhov <dmitry.torokhov@gmail.com> - 2016-10-05 21:20 +0200
  [PATCH 1/2] cgroup: Add generic cgroup subsystem permission checks John Stultz <john.stultz@linaro.org> - 2016-10-04 06:50 +0200
    Re: [PATCH 1/2] cgroup: Add generic cgroup subsystem permission  checks Dmitry Torokhov <dmitry.torokhov@gmail.com> - 2016-10-05 21:10 +0200
      Re: [PATCH 1/2] cgroup: Add generic cgroup subsystem permission checks John Stultz <john.stultz@linaro.org> - 2016-10-05 21:20 +0200
        Re: [PATCH 1/2] cgroup: Add generic cgroup subsystem permission checks Dmitry Torokhov <dmitry.torokhov@gmail.com> - 2016-10-05 21:30 +0200
  Re: [RFC][PATCH 0/2] Another pass at Android style loosening of  cgroup attach permissions Tejun Heo <tj@kernel.org> - 2016-10-04 18:20 +0200
    Re: [RFC][PATCH 0/2] Another pass at Android style loosening of  cgroup attach permissions John Stultz <john.stultz@linaro.org> - 2016-10-04 20:10 +0200
    Re: [RFC][PATCH 0/2] Another pass at Android style loosening of  cgroup attach permissions John Stultz <john.stultz@linaro.org> - 2016-10-04 20:10 +0200
      Re: [RFC][PATCH 0/2] Another pass at Android style loosening of  cgroup attach permissions Tejun Heo <tj@kernel.org> - 2016-10-04 21:40 +0200
        Re: [RFC][PATCH 0/2] Another pass at Android style loosening of  cgroup attach permissions Tejun Heo <tj@kernel.org> - 2016-10-04 21:50 +0200
        Re: [RFC][PATCH 0/2] Another pass at Android style loosening of  cgroup attach permissions John Stultz <john.stultz@linaro.org> - 2016-10-04 21:50 +0200
        Re: [RFC][PATCH 0/2] Another pass at Android style loosening of  cgroup attach permissions "Serge E. Hallyn" <serge@hallyn.com> - 2016-10-04 22:20 +0200
          Re: [RFC][PATCH 0/2] Another pass at Android style loosening of  cgroup attach permissions Tejun Heo <tj@kernel.org> - 2016-10-04 22:40 +0200
            Re: [RFC][PATCH 0/2] Another pass at Android style loosening of  cgroup attach permissions "Serge E. Hallyn" <serge@hallyn.com> - 2016-10-04 23:30 +0200
              Re: [RFC][PATCH 0/2] Another pass at Android style loosening of  cgroup attach permissions Tejun Heo <tj@kernel.org> - 2016-10-04 23:40 +0200

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