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

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Message-ID: <32754.1162499917@redhat.com>
Date:	Thu, 02 Nov 2006 20:38:37 +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:

> Just why are you doing all this? Why do we need a back-end that requires
> all this extra client-side security infrastructure in order to work? 

Well, both Christoph and Al are of the opinion that I should be using
vfs_mkdir() and co rather than bypassing the security and calling inode ops
directly.

Also I should be setting security labels on the files I create.

> IOW: What is wrong with the existing CacheFS?

Well, you did require it to be reviewed by Christoph...

David

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