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Date: Tue, 10 Jun 2014 21:40:21 +0100
From: Matthew Garrett <mjg59@srcf.ucam.org>
To: Dmitry Kasatkin <dmitry.kasatkin@gmail.com>
Cc: Josh Boyer <jwboyer@redhat.com>, David Howells <dhowells@redhat.com>,
        Mimi Zohar <zohar@linux.vnet.ibm.com>,
        Dmitry Kasatkin <d.kasatkin@samsung.com>, keyrings@linux-nfs.org,
        linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org
Subject: Re: [PATCH 0/4] KEYS: validate key trust with owner and builtin keys
 only
Message-ID: <20140610204021.GA8916@srcf.ucam.org>
References: <1402331614.7064.60.camel@dhcp-9-2-203-236.watson.ibm.com>
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 <20140610122008.GA31944@hansolo.jdub.homelinux.org>
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On Tue, Jun 10, 2014 at 11:34:17PM +0300, Dmitry Kasatkin wrote:

> Preventing loading keys from uefi except dbx by default actually improves
> security. Adding kernel parameter to read db we make system more
> vulnerable.

It only adds security if you're performing a measured boot and remote 
attestation. Otherwise you implicitly trust that key anyway. In almost 
all cases refusing to trust db gives you a false sense of security 
without any real improvement. I don't think it's obvious it should be 
the default.

-- 
Matthew Garrett | mjg59@srcf.ucam.org
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