From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Michael Kerrisk (man-pages)" <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Subject: Re: For review: user_namespace(7) man page
Date: Thu, 11 Sep 2014 07:40:12 -0700
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To: "Eric W. Biederman" <ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
Cc: "linux-man-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" <linux-man-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, richard.weinberger-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, containers-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, lkml <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, Andy Lutomirski <luto-kltTT9wpgjJwATOyAt5JVQ@public.gmane.org>, mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
List-Id: linux-man@vger.kernel.org

On 09/09/2014 09:16 AM, Eric W. Biederman wrote:
>>> On a related note.  One thing that has come up recently (in 3 separate
>>> >> implementations is that mount(MS_REMOUNT|...,...) must include all of
>>> >> the mount flags that need to be preserved.   People creating read-only
>>> >> bind mounts tend to miss that and the locked flags in mount namespaces.
>>> >> That issue was flushed out now that the kernel is now not allowing most
>>> >> mount flags to be cleared in mount namespaces.
>> >
>> > So, are you meaning that something needs to be added to the page
>> > regarding this point?
> Yes.  The interface is non-intuitive and we should at least document
> the weirdness.

Okay -- I have added that piece to mount(2).

Thanks,

Michael


-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/