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    SubjectRe: [PATCH 01/15] add Documentation/namespaces/user_namespace.txt (v3)
    Quoting Andrew Morton (akpm@linux-foundation.org):
    > On Fri, 2 Sep 2011 19:56:26 +0000
    > Serge Hallyn <serge@hallyn.com> wrote:
    >
    > > +Note that this userid mapping for the VFS is not yet implemented, though the
    > > +lkml and containers mailing list archives will show several previous
    > > +prototypes. In the end, those got hung up waiting on the concept of targeted
    > > +capabilities to be developed, which, thanks to the insight of Eric Biederman,
    > > +they finally did.
    >
    > not-yet-implemented things worry me. When can we expect this to
    > happen, and how big and ugly will it be?

    Hi Andrew,

    We did a proof of concept of the simplest version of this in early August
    (see git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/linux-userns-devel.git)
    which actually was very un-scary. So technically we could push it at the
    same time as this set, but I thought that might just be too much for
    review in one cycle. That set (Eric's) is the very simplest approach
    which tags an entire filesystem with a user namespace.

    We would also want to pursue the more baroque approach, where filesystems
    themselves are user-namespace aware. I did an approach like that in
    2008, see
    https://lists.linux-foundation.org/pipermail/containers/2008-August/012679.html
    It again is very do-able without being ugly, but, importantly, user
    namespaces are usable for containers without that. For starters, we only
    need /proc and /sys to be user namespace aware (since they must allow
    access from multiple namespaces), and that is simple as they are not
    persistent.

    So I believe that this is the last scary patchset, and that user
    namespaces could actually be usable by the end of the year!

    > I'm not seeing many (any) reviewed-by's on these patches. I could get
    > down and stare at them myself, but that wouldn't be very useful. This
    > work goes pretty deep and is quite security-affecting. And network-afecting.
    > Can you round up some suitable people and get the reviewing and testing happening
    > please?

    Will try. Unfortunately I missed my chance to beg and bribe people in
    person at plumbers :(

    thanks,
    -serge


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