linux-kernel - Re: [RFC 0/28] Patches to pass vfsmount to LSM inode security hooks

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Date:	Tue, 6 Feb 2007 21:26:14 +1100
From:	Neil Brown <neilb@...e.de>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Andreas Gruenbacher <agruen@...e.de>,
	Trond Myklebust <trond.myklebust@....uio.no>,
	Tony Jones <tonyj@...e.de>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, chrisw@...s-sol.org,
	linux-security-module@...r.kernel.org, viro@...iv.linux.org.uk
Subject: Re: [RFC 0/28] Patches to pass vfsmount to LSM inode security hooks

On Tuesday February 6, hch@...radead.org wrote:
> On Mon, Feb 05, 2007 at 07:20:35PM -0800, Andreas Gruenbacher wrote:
> > It's actually not hard to "fix", and nfsd would look a little less weird. But 
> > what would this add, what do pathnames mean in the context of nfsd, and would 
> > nfsd actually become less weird?
> 
> It's not actually a pathname we care about, but a vfsmount + dentry
> combo.  That one means as much in nfsd as elsewhere.  We want nfsd
> to obey r/o or noatime mount flags if /export/foo is exported with them
> but /foo not.  Even better would be to change nfsd so it creates it's
> own non-visible vfsmount for the filesystems it exports..

What would be the benefit of having private non-visible vfsmounts?
Sounds like a recipe for confusion?

It is possible that mountd might start doing bind-mounts to create the
'pseudo filesystem' thing for NFSv4, but they would be very visible
(under /var/lib/nfs/v4root or something).  So having it's own vfsmount
might make sense, but I don't get 'non-visible'.

NeilBrown
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