linux-kernel - Re: [AppArmor 01/41] Pass struct vfsmount to the inode

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Message-ID: <20070524184039.GH4095@ftp.linux.org.uk>
Date:	Thu, 24 May 2007 19:40:39 +0100
From:	Al Viro <viro@....linux.org.uk>
To:	Andreas Gruenbacher <agruen@...e.de>
Cc:	James Morris <jmorris@...ei.org>, jjohansen@...e.de,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, chrisw@...s-sol.org,
	Tony Jones <tonyj@...e.de>
Subject: Re: [AppArmor 01/41] Pass struct vfsmount to the inode_create LSM hook

On Thu, May 24, 2007 at 08:10:00PM +0200, Andreas Gruenbacher wrote:

> Read it like this: we don't have a good idea how to support multiple 
> namespaces so far. Currently, we interpret all pathnames relative to the 
> namespace a process is in. Confined processes don't have the privilege to 
> create or manipulate namespaces, which makes this safe. We may find a better 
> future solution.

You also don't have a solution for multiple chroot jails, since they
often have the same fs mounted in many places on given box *and* since
the pathnames from the confined processes' POVs have fsck-all to do
with each other.

It's really not kinder than multiple namespaces as far as your approach
is concerned.
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