linux-kernel - Re: [PATCH 1/7] Security: Provide copy-up security hooks for unioned files

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Message-ID: <1598563.E145j9ZHLH@sifl>
Date:	Mon, 10 Nov 2014 10:28:02 -0500
From:	Paul Moore <paul@...l-moore.com>
To:	David Howells <dhowells@...hat.com>
Cc:	linux-unionfs@...r.kernel.org, selinux@...ho.nsa.gov,
	linux-fsdevel@...r.kernel.org,
	linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/7] Security: Provide copy-up security hooks for unioned files

On Friday, November 07, 2014 10:10:34 PM David Howells wrote:
> Paul Moore <paul@...l-moore.com> wrote:
> > This didn't occur to me earlier, but we may want to pick a different
> > phrase to use instead of "copy_up" as that has a special meaning for some
> > security/MLS folks...
> 
> It does?

Yep, think upgrading the sensitivity level, e.g. relabeling a "secret" file up 
to a "top secret".

> security_inode_make_union()?

Actually, after thinking on this some more, forget I mentioned anything.  The 
existing "copy_up" makes the most sense for the LSM hook (it matches the 
naming of the caller in overlayfs, which is a nice thing) and the number of 
times any MLS will look that closely at the kernel code is going to be very 
few.

-- 
paul moore
www.paul-moore.com

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