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Re: [PATCH v2] xattr: Enable security.capability in user namespaces

From "Serge E. Hallyn" <serge@hallyn.com>
Newsgroups linux.kernel
Subject Re: [PATCH v2] xattr: Enable security.capability in user namespaces
Date 2017-07-13 23:20 +0200
Message-ID <u2TGG-2pl-27@gated-at.bofh.it> (permalink)
References (5 earlier) <u2AXn-7n9-3@gated-at.bofh.it> <u2Lg8-5xB-43@gated-at.bofh.it> <u2Ptn-813-7@gated-at.bofh.it> <u2PMK-8mJ-9@gated-at.bofh.it> <u2Qpr-cO-1@gated-at.bofh.it>
Organization linux.* mail to news gateway

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Quoting Eric W. Biederman (ebiederm@xmission.com):
> Stefan Berger <stefanb@linux.vnet.ibm.com> writes:
> If you don't care about the ownership of the files, and read only is
> acceptable, and you still don't want to give these executables
> capabilities in the initial user namespace.  What you can do is
> make everything owned by some non-zero uid including the security
> capability.  Call this non-zero uid image-root.
> 
> When the container starts it creates two nested user namespaces first
> with image-root mapped to 0.  Then with the containers choice of uid
> mapped to 0 image-root unmapped.  This will ensure the capability
> attributes work for all containers that share that root image.  And it
> ensures the file are read-only from the container.
> 
> So I don't think there is ever a case where we would share a filesystem
> image where we would need to set multiple security attributes on a file.

Neat idea.  In fact, you can take it a step further and still have the
files be owned by valid uids in the containers.  The parent ns just
needs to have its *root* map to a common kuid not mapped into the child
namespaces, but the files can be owned by another kuid which *is* mapped
into the child containers.

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[PATCH v2] xattr: Enable security.capability in user namespaces Stefan Berger <"Stefan Bergerstefanb"@linux.vnet.ibm.com> - 2017-07-11 17:10 +0200
  Re: [PATCH v2] xattr: Enable security.capability in user namespaces "Serge E. Hallyn" <serge@hallyn.com> - 2017-07-11 19:20 +0200
    Re: [PATCH v2] xattr: Enable security.capability in user namespaces Stefan Berger <stefanb@linux.vnet.ibm.com> - 2017-07-12 02:20 +0200
      Re: [PATCH v2] xattr: Enable security.capability in user namespaces "Serge E. Hallyn" <serge@hallyn.com> - 2017-07-12 02:50 +0200
  Re: [PATCH v2] xattr: Enable security.capability in user namespaces "Serge E. Hallyn" <serge@hallyn.com> - 2017-07-12 05:50 +0200
    Re: [PATCH v2] xattr: Enable security.capability in user namespaces Stefan Berger <stefanb@linux.vnet.ibm.com> - 2017-07-12 13:40 +0200
      Re: [PATCH v2] xattr: Enable security.capability in user namespaces "Serge E. Hallyn" <serge@hallyn.com> - 2017-07-12 19:40 +0200
  Re: [PATCH v2] xattr: Enable security.capability in user  namespaces James Morris <jmorris@namei.org> - 2017-07-12 10:10 +0200
  Re: [PATCH v2] xattr: Enable security.capability in user namespaces ebiederm@xmission.com (Eric W. Biederman) - 2017-07-12 15:40 +0200
    Re: [PATCH v2] xattr: Enable security.capability in user namespaces "Serge E. Hallyn" <serge@hallyn.com> - 2017-07-12 19:10 +0200
      Re: [PATCH v2] xattr: Enable security.capability in user  namespaces James Morris <jmorris@namei.org> - 2017-07-13 00:30 +0200
        Re: [PATCH v2] xattr: Enable security.capability in user namespaces ebiederm@xmission.com (Eric W. Biederman) - 2017-07-13 02:50 +0200
          Re: [PATCH v2] xattr: Enable security.capability in user namespaces "Serge E. Hallyn" <serge@hallyn.com> - 2017-07-13 03:10 +0200
      Re: [PATCH v2] xattr: Enable security.capability in user namespaces ebiederm@xmission.com (Eric W. Biederman) - 2017-07-13 01:30 +0200
        Re: [PATCH v2] xattr: Enable security.capability in user namespaces Stefan Berger <stefanb@linux.vnet.ibm.com> - 2017-07-13 02:50 +0200
          Re: [PATCH v2] xattr: Enable security.capability in user namespaces Theodore Ts'o <tytso@mit.edu> - 2017-07-13 03:20 +0200
            Re: [PATCH v2] xattr: Enable security.capability in user namespaces "Serge E. Hallyn" <serge@hallyn.com> - 2017-07-13 04:40 +0200
            Re: [PATCH v2] xattr: Enable security.capability in user namespaces ebiederm@xmission.com (Eric W. Biederman) - 2017-07-13 14:20 +0200
              Re: [PATCH v2] xattr: Enable security.capability in user namespaces Theodore Ts'o <tytso@mit.edu> - 2017-07-13 18:50 +0200
                Re: [PATCH v2] xattr: Enable security.capability in user namespaces Stefan Berger <stefanb@linux.vnet.ibm.com> - 2017-07-13 19:10 +0200
                Re: [PATCH v2] xattr: Enable security.capability in user namespaces ebiederm@xmission.com (Eric W. Biederman) - 2017-07-13 19:50 +0200
                Re: [PATCH v2] xattr: Enable security.capability in user namespaces Theodore Ts'o <tytso@mit.edu> - 2017-07-13 21:20 +0200
                Re: [PATCH v2] xattr: Enable security.capability in user namespaces "Serge E. Hallyn" <serge@hallyn.com> - 2017-07-13 21:50 +0200
                Re: [PATCH v2] xattr: Enable security.capability in user namespaces "Serge E. Hallyn" <serge@hallyn.com> - 2017-07-13 23:20 +0200
                Re: [PATCH v2] xattr: Enable security.capability in user  namespaces James Morris <jmorris@namei.org> - 2017-07-18 09:10 +0200
                Re: [PATCH v2] xattr: Enable security.capability in user namespaces ebiederm@xmission.com (Eric W. Biederman) - 2017-07-13 19:30 +0200
                Re: [PATCH v2] xattr: Enable security.capability in user namespaces Stefan Berger <stefanb@linux.vnet.ibm.com> - 2017-07-13 19:40 +0200
                Re: [PATCH v2] xattr: Enable security.capability in user namespaces ebiederm@xmission.com (Eric W. Biederman) - 2017-07-13 20:00 +0200
                Re: [PATCH v2] xattr: Enable security.capability in user namespaces "Serge E. Hallyn" <serge@hallyn.com> - 2017-07-13 21:50 +0200
                Re: [PATCH v2] xattr: Enable security.capability in user namespaces ebiederm@xmission.com (Eric W. Biederman) - 2017-07-13 23:30 +0200
                Re: [PATCH v2] xattr: Enable security.capability in user namespaces ebiederm@xmission.com (Eric W. Biederman) - 2017-07-14 02:50 +0200
                Re: [PATCH v2] xattr: Enable security.capability in user namespaces Stefan Berger <stefanb@linux.vnet.ibm.com> - 2017-07-14 13:40 +0200
                Re: [PATCH v2] xattr: Enable security.capability in user namespaces ebiederm@xmission.com (Eric W. Biederman) - 2017-07-14 14:20 +0200
                Re: [PATCH v2] xattr: Enable security.capability in user namespaces Stefan Berger <stefanb@linux.vnet.ibm.com> - 2017-07-14 14:50 +0200
                Re: [PATCH v2] xattr: Enable security.capability in user namespaces "Serge E. Hallyn" <serge@hallyn.com> - 2017-07-14 15:40 +0200
                Re: [PATCH v2] xattr: Enable security.capability in user namespaces Stefan Berger <stefanb@linux.vnet.ibm.com> - 2017-07-14 17:30 +0200
                Re: [PATCH v2] xattr: Enable security.capability in user namespaces "Serge E. Hallyn" <serge@hallyn.com> - 2017-07-14 19:40 +0200
                Re: [PATCH v2] xattr: Enable security.capability in user namespaces ebiederm@xmission.com (Eric W. Biederman) - 2017-07-14 20:30 +0200
                Re: [PATCH v2] xattr: Enable security.capability in user namespaces Mimi Zohar <zohar@linux.vnet.ibm.com> - 2017-07-14 20:50 +0200
                Re: [PATCH v2] xattr: Enable security.capability in user namespaces James Bottomley <James.Bottomley@HansenPartnership.com> - 2017-07-14 21:00 +0200
                Re: [PATCH v2] xattr: Enable security.capability in user namespaces Mimi Zohar <zohar@linux.vnet.ibm.com> - 2017-07-14 22:10 +0200
                Re: [PATCH v2] xattr: Enable security.capability in user namespaces James Bottomley <James.Bottomley@HansenPartnership.com> - 2017-07-14 22:50 +0200
                Re: [PATCH v2] xattr: Enable security.capability in user namespaces Theodore Ts'o <tytso@mit.edu> - 2017-07-14 23:40 +0200
                Re: [PATCH v2] xattr: Enable security.capability in user namespaces ebiederm@xmission.com (Eric W. Biederman) - 2017-07-15 01:40 +0200
                Re: [PATCH v2] xattr: Enable security.capability in user namespaces Mimi Zohar <zohar@linux.vnet.ibm.com> - 2017-07-15 01:40 +0200
                Re: [PATCH v2] xattr: Enable security.capability in user namespaces ebiederm@xmission.com (Eric W. Biederman) - 2017-07-15 02:10 +0200
                Re: [PATCH v2] xattr: Enable security.capability in user namespaces Theodore Ts'o <tytso@mit.edu> - 2017-07-14 21:30 +0200
                Re: [PATCH v2] xattr: Enable security.capability in user namespaces Mimi Zohar <zohar@linux.vnet.ibm.com> - 2017-07-14 21:50 +0200
                Re: [PATCH v2] xattr: Enable security.capability in user namespaces Mimi Zohar <zohar@linux.vnet.ibm.com> - 2017-07-14 21:30 +0200
                Re: [PATCH v2] xattr: Enable security.capability in user namespaces ebiederm@xmission.com (Eric W. Biederman) - 2017-07-15 02:20 +0200
                Re: [PATCH v2] xattr: Enable security.capability in user namespaces Mimi Zohar <zohar@linux.vnet.ibm.com> - 2017-07-16 13:30 +0200
                Re: [PATCH v2] xattr: Enable security.capability in user namespaces ebiederm@xmission.com (Eric W. Biederman) - 2017-07-14 21:00 +0200
                Re: [PATCH v2] xattr: Enable security.capability in user namespaces Stefan Berger <stefanb@linux.vnet.ibm.com> - 2017-07-14 21:30 +0200
                Re: [PATCH v2] xattr: Enable security.capability in user namespaces "Serge E. Hallyn" <serge@hallyn.com> - 2017-07-13 23:30 +0200
                Re: [PATCH v2] xattr: Enable security.capability in user namespaces "Serge E. Hallyn" <serge@hallyn.com> - 2017-07-13 23:20 +0200
        Re: [PATCH v2] xattr: Enable security.capability in user namespaces "Serge E. Hallyn" <serge@hallyn.com> - 2017-07-13 02:50 +0200
  Re: [PATCH v2] xattr: Enable security.capability in user namespaces Vivek Goyal <vgoyal@redhat.com> - 2017-07-12 20:00 +0200
    Re: [PATCH v2] xattr: Enable security.capability in user namespaces Stefan Berger <stefanb@linux.vnet.ibm.com> - 2017-07-12 21:20 +0200
  Re: [PATCH v2] xattr: Enable security.capability in user namespaces ebiederm@xmission.com (Eric W. Biederman) - 2017-07-15 01:50 +0200
    Re: [PATCH v2] xattr: Enable security.capability in user namespaces Stefan Berger <stefanb@linux.vnet.ibm.com> - 2017-07-15 23:30 +0200
  Re: [PATCH v2] xattr: Enable security.capability in user namespaces Vivek Goyal <vgoyal@redhat.com> - 2017-07-17 21:00 +0200
    Re: [PATCH v2] xattr: Enable security.capability in user namespaces Stefan Berger <stefanb@linux.vnet.ibm.com> - 2017-07-17 23:00 +0200

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