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

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Date:	Thu, 26 Oct 2006 11:54:45 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Al Viro <viro@....linux.org.uk>
Cc:	David Howells <dhowells@...hat.com>, sds@...ho.nsa.gov,
	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

Ar Iau, 2006-10-26 am 01:32 +0100, ysgrifennodd Al Viro:
> to.  What about access to cache tree by root process that has nothing
> to do with that daemon?  Should it get free access to that stuff, regardless
> of what policy might say about access to cached files?  Or should we at
> least try to make sure that we have the instances in cache no more permissive
> than originals on NFS?

This is already the case however. Root has ptrace, people have /proc
access (even more than before because the chroot check was broken
recently), root has CAP_SYS_RAWIO.


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