linux-kernel - Re: Security issues with local filesystem caching

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Message-Id: <1162490657.5519.3.camel@moss-spartans.epoch.ncsc.mil>
Date:	Thu, 02 Nov 2006 13:04:16 -0500
From:	Stephen Smalley <sds@...ho.nsa.gov>
To:	Karl MacMillan <kmacmillan@...talrootkit.com>
Cc:	David Howells <dhowells@...hat.com>, jmorris@...ei.org,
	chrisw@...s-sol.org, selinux@...ho.nsa.gov,
	linux-kernel@...r.kernel.org, aviro@...hat.com
Subject: Re: Security issues with local filesystem caching

On Thu, 2006-11-02 at 11:29 -0500, Karl MacMillan wrote:
> On Wed, 2006-11-01 at 12:45 -0500, Stephen Smalley wrote:
> > On Wed, 2006-11-01 at 10:58 -0500, Karl MacMillan wrote:
> 
> <snip>
> 
> 
> > > fssid seems like the wrong name, though it does match the DAC concept.
> > > This is really more general impersonation of another domain by the
> > > kernel and might have other uses.
> > 
> > NFS will want a fssid in order to have file access checks applied
> > against the client process' SID if/when the client process' context
> > becomes available.
> 
> I was suggesting that it might be helpful if this applied to all checks
> - not just file access - and would therefore need a different name.

Not all checks (e.g. not when checking the ability of another task to
send a signal to the task), but all checks where the task SID is used as
the subject/source.

-- 
Stephen Smalley
National Security Agency


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