linux-kernel - Re: [PATCH 0/4] KEYS: validate key trust with owner and builtin keys only

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Message-ID: <CACE9dm8zxVXx2zRcfDYUFjqvQYT4MbLevp5U13tfH9Hb6USSJw@mail.gmail.com>
Date:	Wed, 11 Jun 2014 00:17:53 +0300
From:	Dmitry Kasatkin <dmitry.kasatkin@...il.com>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	Josh Boyer <jwboyer@...hat.com>,
	David Howells <dhowells@...hat.com>,
	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	Dmitry Kasatkin <d.kasatkin@...sung.com>,
	keyrings <keyrings@...ux-nfs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-security-module <linux-security-module@...r.kernel.org>
Subject: Re: [PATCH 0/4] KEYS: validate key trust with owner and builtin keys only

On 11 June 2014 00:00, Dmitry Kasatkin <dmitry.kasatkin@...il.com> wrote:
> On 10 June 2014 23:40, Matthew Garrett <mjg59@...f.ucam.org> wrote:
>> 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@...f.ucam.org
>
> May be you are right... "in almost all cases"...
>
> It does not mater if one trust DB or not... It's all about
> distro/system configuration...
>
> Normal user even will not know what is default behavior and what
> kernel parameter disables or enables...
> And distro will have it by default or will use kernel parameter... It
> does not change anything...
>
> I am just discussing kernel configuration...
> Without kind of looking to it  I cannot be sure if UEFI keys will
> appear on system keyring or not.
> Now I have to be aware how kernel is compiled... If it is compiled
> with CONFIG_KEYS_UEFI or so
> I need to remember may be to supply addition kernel parameters to
> limit key UEFI usage...
>
> It is may be not a big deal...
>
> --
> Thanks,
> Dmitry


It is probably just a paranoia...
Kconfig MODULE_SIG_UEFI should tell about threat of loading kernel
modules from NSA or Lenovo signed by MS or Lenovo keys..

This hole is opened without warning...

:)


-- 
Thanks,
Dmitry
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