From: Trond Myklebust <trond.myklebust@fys.uio.no>
To: Miklos Szeredi <miklos@szeredi.hu>
Cc: ebiederm@xmission.com, serue@us.ibm.com, linuxram@us.ibm.com,
linux-fsdevel@vger.kernel.org, viro@ftp.linux.org.uk,
containers@lists.osdl.org, akpm@linux-foundation.org,
linux-kernel@vger.kernel.org
Subject: Re: [Devel] Re: [patch 05/10] add "permit user mounts in new namespace" clone flag
Date: Wed, 18 Apr 2007 10:26:29 -0400 [thread overview]
Message-ID: <1176906389.6796.96.camel@heimdal.trondhjem.org> (raw)
In-Reply-To: <E1HeAkl-000490-00@dorka.pomaz.szeredi.hu>
On Wed, 2007-04-18 at 16:03 +0200, Miklos Szeredi wrote:
> > Don't forget that almost all mount flags are per-superblock. How are you
> > planning on dealing with the case that one user mounts a filesystem
> > read-only, while another is trying to mount the same one read-write?
>
> Yeah, I forgot, the per-mount read-only patches are not yet in.
>
> That doesn't really change my agrument though. _If_ the flag is per
> mount, then it makes sense to be able to change it on a master and not
> on a slave. If mount flags are propagated, this is not possible.
Read-only isn't the only issue. On something like NFS, there are flags
to set the security flavour, turn on/off encryption etc.
If I mount your home directory using no encryption in my namespace, for
instance, then neither you nor the administrator will be able to turn it
on afterwards in yours without first unmounting it from mine so that the
superblock is destroyed.
Cheers
Trond
next prev parent reply other threads:[~2007-04-18 14:36 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-12 16:45 [patch 00/10] (resend) mount ownership and unprivileged mount syscall Miklos Szeredi
2007-04-12 16:45 ` [patch 01/10] add user mounts to the kernel Miklos Szeredi
2007-04-12 16:45 ` [patch 02/10] allow unprivileged umount Miklos Szeredi
2007-04-12 16:45 ` [patch 03/10] account user mounts Miklos Szeredi
2007-04-12 16:45 ` [patch 04/10] add "permit user mounts" flag to namespaces Miklos Szeredi
2007-04-12 16:45 ` [patch 05/10] add "permit user mounts in new namespace" clone flag Miklos Szeredi
2007-04-12 20:32 ` Serge E. Hallyn
2007-04-13 4:16 ` Herbert Poetzl
2007-04-13 7:09 ` Miklos Szeredi
2007-04-13 4:45 ` Eric W. Biederman
2007-04-13 7:12 ` Miklos Szeredi
2007-04-13 13:47 ` Serge E. Hallyn
2007-04-13 14:22 ` Eric W. Biederman
2007-04-16 8:47 ` [Devel] " Ram Pai
2007-04-16 9:32 ` Miklos Szeredi
2007-04-16 9:49 ` Ram Pai
2007-04-16 9:56 ` Miklos Szeredi
2007-04-16 15:43 ` Eric W. Biederman
2007-04-16 15:58 ` Miklos Szeredi
2007-04-16 19:16 ` Eric W. Biederman
2007-04-16 19:56 ` Serge E. Hallyn
2007-04-17 9:04 ` Eric W. Biederman
2007-04-17 11:09 ` Miklos Szeredi
2007-04-17 18:16 ` Eric W. Biederman
2007-04-17 18:36 ` Miklos Szeredi
2007-04-17 19:54 ` Eric W. Biederman
2007-04-18 9:11 ` Miklos Szeredi
2007-04-18 13:55 ` Trond Myklebust
2007-04-18 14:03 ` Miklos Szeredi
2007-04-18 14:26 ` Trond Myklebust [this message]
2007-04-18 15:01 ` Christoph Hellwig
2007-04-18 19:00 ` Trond Myklebust
2007-04-18 15:06 ` Miklos Szeredi
2007-04-18 17:14 ` Eric W. Biederman
2007-04-18 18:05 ` Miklos Szeredi
2007-04-19 9:02 ` Miklos Szeredi
2007-04-17 14:25 ` Serge E. Hallyn
2007-04-17 14:28 ` Serge E. Hallyn
2007-04-16 17:14 ` Ram Pai
2007-04-16 17:50 ` Miklos Szeredi
2007-04-17 17:07 ` Serge E. Hallyn
2007-04-17 17:44 ` Miklos Szeredi
2007-04-17 18:15 ` Serge E. Hallyn
2007-04-17 18:58 ` Miklos Szeredi
2007-04-17 19:28 ` Ram Pai
2007-04-17 19:43 ` Miklos Szeredi
2007-04-17 20:25 ` Ram Pai
2007-04-18 9:19 ` Miklos Szeredi
2007-04-18 18:35 ` Ram Pai
2007-04-18 19:14 ` Miklos Szeredi
2007-04-18 19:41 ` Ram Pai
2007-04-19 8:36 ` Miklos Szeredi
2007-04-12 16:45 ` [patch 06/10] propagate error values from clone_mnt Miklos Szeredi
2007-04-12 16:45 ` [patch 07/10] allow unprivileged bind mounts Miklos Szeredi
2007-04-12 16:45 ` [patch 08/10] put declaration of put_filesystem() in fs.h Miklos Szeredi
2007-04-12 16:45 ` [patch 09/10] allow unprivileged mounts Miklos Szeredi
2007-04-12 16:45 ` [patch 10/10] allow unprivileged fuse mounts Miklos Szeredi
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