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

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Message-ID: <453FA220.3090001@wolfmountaingroup.com>
Date:	Wed, 25 Oct 2006 11:42:56 -0600
From:	"Jeff V. Merkey" <jmerkey@...fmountaingroup.com>
To:	David Howells <dhowells@...hat.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

David Howells wrote:

>Jeff V. Merkey <jmerkey@...fmountaingroup.com> wrote:
>
>  
>
>>SELinux support addresses all of these issues for B1 level security quite
>>well with mandatory access controls at the fs layers.  In fact, it works so
>>well, when enabled you cannot even run apache on top of an FS unless
>>configured properly.
>>    
>>
>
>How?  The problem I've got is that the caching code would be creating and
>accessing files and directories with the wrong security context - that of the
>calling process - and not a context suitable for sharing things in the cache
>whilst protecting them from userspace as best we can.
>  
>
Have it access them as 0.0 (root) when you change the fsuid, etc. and I 
think this would satisfy security concerns.  I agree that it sounds like
someone needs to instrument MAC layers with this subsystem.

Jeff

>David
>
>  
>

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