linux-kernel - Re: [PATCH 5/7] SELinux: Handle opening of a unioned file

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Message-ID: <18137.1434641209@warthog.procyon.org.uk>
Date:	Thu, 18 Jun 2015 16:26:49 +0100
From:	David Howells <dhowells@...hat.com>
To:	Stephen Smalley <sds@...ho.nsa.gov>
Cc:	dhowells@...hat.com, eparis@...hat.com,
	linux-unionfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	drquigl <drquigl@...ho.nsa.gov>,
	linux-security-module@...r.kernel.org, selinux@...ho.nsa.gov,
	linux-fsdevel@...r.kernel.org, Paul Moore <paul@...l-moore.com>
Subject: Re: [PATCH 5/7] SELinux: Handle opening of a unioned file

Stephen Smalley <sds@...ho.nsa.gov> wrote:

> Almost want to be able to compute a transition label for the ecryptfs
> inodes from the lower inode label so that it can be derived from but
> potentially different from the lower inode label.  That way policy could
> maintain per-file distinctions within an ecryptfs mount and distinguish
> between access to the encrypted vs plaintext representations.

Yeah.  What we want is something like:

  lower-inode-label + proposed-upper-label + subject-label -> inode-label

By proposed-upper-label I mean the default label for a new inode at that the
point in the directory tree at which the copy up will take place.

David
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