Date: Tue, 15 Jan 2008 14:23:14 -0800 (PST)
From: Casey Schaufler <casey@schaufler-ca.com>
Reply-To: casey@schaufler-ca.com
Subject: Re: [PATCH 08/28] SECURITY: Allow kernel services to override LSM settings for task actions [try #2]
To: David Howells <dhowells@redhat.com>, Stephen Smalley <sds@tycho.nsa.gov>
Cc: dhowells@redhat.com, casey@schaufler-ca.com,
       Daniel J Walsh <dwalsh@redhat.com>, linux-kernel@vger.kernel.org,
       selinux@tycho.nsa.gov, linux-security-module@vger.kernel.org
In-Reply-To: <6778.1200434110@redhat.com>
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--- David Howells <dhowells@redhat.com> wrote:

> Stephen Smalley <sds@tycho.nsa.gov> wrote:
> 
> > The cache files are created by the cachefiles kernel module, not by the
> > userspace daemon, and the userspace daemon doesn't need to directly
> > read/write them at all
> 
> That is correct.
> 
> > (but I think it does need to be able to unlink them?).
> 
> Indeed.
> 
> > The userspace daemon merely identifies the directory where the cache should
> > live as part of configuring the cache when enabling it.
> 
> That is the way it currently works, yes.
>  
> > Hence, it is fine to use a fixed label for the cache files (systemhigh
> > in a MLS world), and to let the directory's label serve as the basis for
> > it.
> 
> That is what I currently do.  SELinux rules are provided to grant the
> appropriate file accesses to the override label used by the kernel module, so
> that it can't go and stamp on files with the wrong label.
> 
> > Only the cachefiles kernel module directly reads and writes the files.
> 
> Correct.

Well, my bad, and thank you for clearing up my misunderstanding.


Casey Schaufler
casey@schaufler-ca.com
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