Date: Wed, 3 Oct 2007 13:21:32 -0700 (PDT)
From: Casey Schaufler <casey@schaufler-ca.com>
Reply-To: casey@schaufler-ca.com
Subject: Re: [PATCH] Version 4 (2.6.23-rc8-mm2) Smack: Simplified Mandatory Access Control Kernel
To: Alan Cox <alan@lxorguk.ukuu.org.uk>, Al Viro <viro@ftp.linux.org.uk>
Cc: Casey Schaufler <casey@schaufler-ca.com>, torvalds@osdl.org,
       linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org,
       akpm@osdl.org, paul.moore@hp.com
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--- Alan Cox <alan@lxorguk.ukuu.org.uk> wrote:

> > Absolute paths in that kind of thing are _wrong_.  You know where the
> things
> > are on your fs.  You don't know if anything else will be visible, let alone
> > whether it will be at the same place in all chroots or namespaces.  And no,
> > you _can't_ make sure that fs is visible only in one place.  No fs can or
> > has any business even trying.
> 
> What I don't understand here is why we need the hacks when we already
> support sufficient mount magic to give each login session its own
> private /tmp ?

An embedded system that does not have user logins but that does
have applications that require separation, perhaps a moble communication
device with application download capability, is just one example
where the smack symlink implementation provides the required
function without requiring application support.
 

Casey Schaufler
casey@schaufler-ca.com
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