linux-kernel - Re: [PATCH 5/8] SELinux: Stub in copy-up handling

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Date:	Thu, 18 Jun 2015 17:51:15 +0100
From:	David Howells <dhowells@...hat.com>
To:	Stephen Smalley <sds@...ho.nsa.gov>
Cc:	dhowells@...hat.com, viro@...iv.linux.org.uk, miklos@...redi.hu,
	linux-fsdevel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	linux-unionfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	Paul Moore <paul@...l-moore.com>,
	SELinux <selinux@...ho.nsa.gov>
Subject: Re: [PATCH 5/8] SELinux: Stub in copy-up handling

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

> I'm not sure we never want to copy up the SELinux attribute.  See my
> other email about ecryptfs and supporting per-file labeling and
> consistent access control over the upper and lower inodes.

Yes.  That's why there are two operations. inode_copy_up() should set the
label appropriately and inode_copy_up_xattr() should prevent the label set by
inode_copy_up() from being clobbered.

Note that inode_copy_up() has access to the lower file label and can perform
some sort of incantation to transmute it before applying it.

David
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