linux-kernel - Re: [PATCH 3/4] module: search the key only by keyid

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Date:	Fri, 03 Oct 2014 16:08:56 +0300
From:	Dmitry Kasatkin <d.kasatkin@...sung.com>
To:	David Howells <dhowells@...hat.com>
Cc:	zohar@...ux.vnet.ibm.com, linux-ima-devel@...ts.sourceforge.net,
	linux-security-module@...r.kernel.org, jmorris@...ei.org,
	rusty@...tcorp.com.au, keyrings@...ux-nfs.org,
	linux-kernel@...r.kernel.org, dmitry.kasatkin@...il.com
Subject: Re: [PATCH 3/4] module: search the key only by keyid

On 03/10/14 15:53, Dmitry Kasatkin wrote:
> On 03/10/14 15:49, Dmitry Kasatkin wrote:
>> On 03/10/14 15:46, David Howells wrote:
>>> Dmitry Kasatkin <d.kasatkin@...sung.com> wrote:
>>>
>>>> Latest KEYS code change the way keys identified and module
>>>> signing keys are not searchable anymore with original id.
>>>>
>>>> This patch fixes this problem without change module signature
>>>> data.
>>> This isn't sufficient.  The key search must also include the signer.

BTW. But actually why signer is needed to find the key?
Every key has unique fingerprint.

Or you say that different certificates might have the same PK?
What I would consider strange. But anyway, if PK is the same, then
verification succeed.

- Dmitry

>> IMA uses "id:<id>" partial matching.. There is no signer in the signature.
>> It is added as "last resort"
>>
>> It is here... the same but I renamed with finger print..
>>
>> http://git.kernel.org/cgit/linux/kernel/git/kasatkin/linux-digsig.git/commit/?h=keys-fixes&id=f036bb9a4c1b3c548f315226d3284e6a91d284e7
>>
>> - Dmitry
>>
>>
> For module actually I made it as a fix because it was broken.
> Other requires changes in module signature format...
>
> - Dmitry
>
>

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