linux-kernel - Re: [PATCH 11/14] CacheFiles: Permit an inode's security ID to be obtained [try #2]

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Date:	Thu, 09 Aug 2007 20:07:39 +0100
From:	David Howells <dhowells@...hat.com>
To:	James Morris <jmorris@...ei.org>
Cc:	dhowells@...hat.com, Casey Schaufler <casey@...aufler-ca.com>,
	torvalds@...l.org, akpm@...l.org, steved@...hat.com,
	trond.myklebust@....uio.no, linux-fsdevel@...r.kernel.org,
	linux-cachefs@...hat.com, nfsv4@...ux-nfs.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 11/14] CacheFiles: Permit an inode's security ID to be obtained [try #2]

James Morris <jmorris@...ei.org> wrote:

> David, I've looked at the code and can't see that you need to access the 
> label itself outside the LSM.  Could you instead simply pass the inode 
> pointer around?

It's not quite that simple.  I need to impose *two* security labels in
cachefiles_begin_secure() when I'm about to act on behalf of a process that's
tried to access a netfs file:

 (1) The security label to act as.  This is the label attached to the
     cachefilesd process when it starts the cache.  This is obtained by
     cachefiles_get_security_ID().

 (2) The security label to create files as.  This is the label attached to
     root directory of the cache.  This is obtained by
     cachefiles_determine_cache_secid().

David
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