linux-kernel - Re: [PATCH 2/7] Overlayfs: Use copy-up security hooks

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Message-ID: <3148.1415397940@warthog.procyon.org.uk>
Date:	Fri, 07 Nov 2014 22:05:40 +0000
From:	David Howells <dhowells@...hat.com>
To:	Paul Moore <paul@...l-moore.com>
Cc:	dhowells@...hat.com, 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 2/7] Overlayfs: Use copy-up security hooks

Paul Moore <paul@...l-moore.com> wrote:

> So the LSM must modify the xattr in place?  I suppose that since the @value
> is allocated to the max size it shouldn't be a problem.  Just checking ...

... And the caller must provide a maximally sized buffer (which it likely has
to allocate anyway).

I'm not sure I really need to provide the modification thing.  I suspect a
binary keep or discard decision is sufficient.

David
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