linux-kernel - Re: [PATCH 1/5] initmpfs: replace MS

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Date:	Sat, 29 Jun 2013 22:09:20 -0500
From:	Rob Landley <rob@...dley.net>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	linux-kernel@...r.kernel.org, Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH 1/5] initmpfs: replace MS_NOUSER in initramfs

On 06/29/2013 08:15:40 PM, Eric W. Biederman wrote:
> Rob Landley <rob@...dley.net> writes:
> 
> > From: Rob Landley <rob@...dley.net>
> >
> > Mounting MS_NOUSER prevents --bind mounts from rootfs. Prevent new  
> rootfs
> > mounts with a different mechanism that doesn't affect bind mounts.
> 
> I don't see patches 4 and 5 so I don't know if you have covered this
> elsewhere but a very important part of the reason for MS_NOUSER is to
> prevent unmounting of rootfs.
> 
> The entire vfs breaks if you are allowed to unmount rootfs, and it
> appears this patch is allowing that.

I mean I tried "mount --move / home". (--bind worked.)

Long day...

Rob--
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