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

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Date:	Fri, 03 Nov 2006 15:33:18 +0000
From:	David Howells <dhowells@...hat.com>
To:	Trond Myklebust <trond.myklebust@....uio.no>
Cc:	David Howells <dhowells@...hat.com>,
	Stephen Smalley <sds@...ho.nsa.gov>,
	Karl MacMillan <kmacmill@...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 

Trond Myklebust <trond.myklebust@....uio.no> wrote:

> No. I was thinking of keeping the cache on its own partition

That's a requirement I am specifically avoiding with CacheFiles.  I might, for
instance, want to use it on my laptop, and I don't really have enough space to
set aside a partition just for that.  The whole point of CacheFiles is that
you don't have to set one aside.  If you're going to do that, then CacheFS
should be a better option.

> and using kernel mounts. cachefilesd could possibly mount the thing in its
> own private namespace.

That's still user visible, and SELinux in enforcing mode would still apply.

David
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