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

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Date:	Wed, 25 Oct 2006 19:15:58 +0100
From:	David Howells <dhowells@...hat.com>
To:	"Jeff V. Merkey" <jmerkey@...fmountaingroup.com>
Cc:	Nate Diller <nate.diller@...il.com>, sds@...ho.nsa.gov,
	jmorris@...ei.org, chrisw@...s-sol.org, selinux@...ho.nsa.gov,
	linux-kernel@...r.kernel.org, aviro@...hat.com,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: Security issues with local filesystem caching 

Jeff V. Merkey <jmerkey@...fmountaingroup.com> wrote:

> Have it access them as 0.0 (root) when you change the fsuid, etc. and I think
> this would satisfy security concerns.

That's what I'm currently doing, but Christoph objected and said I'm not
allowed to change fsuid and fsgid.

That also doesn't cover the MAC issues.

> I agree that it sounds like someone needs to instrument MAC layers with this
> subsystem.

Yes.

David
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