linux-kernel - Re: [PATCH 04/16] integrity: Allow digital signature verification with a given keyring ptr

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Date:	Wed, 11 Sep 2013 13:34:33 -0400
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, kexec@...ts.infradead.org,
	akpm@...ux-foundation.org, d.kasatkin@...sung.com,
	ebiederm@...ssion.com, hpa@...or.com, matthew.garrett@...ula.com
Subject: Re: [PATCH 04/16] integrity: Allow digital signature verification
 with a given keyring ptr

On Tue, 2013-09-10 at 17:44 -0400, Vivek Goyal wrote:
> Currently digital signature verification code assumes that it can be
> used only with 3 keyrings. IMA, EVM and MODULE keyring. Provide another
> variant where one can pass in a pointer to keyring (struct key *), and
> integrity code can try to find key in that keyring and verify signature.
> 
> This will be useful at two places.
> 
> - elf binary loader can use system keyring and call into integrity
>   subsystem for signature verification.
> - In later patches I am extending keyctl() to allow signature of
>   a user buffer against specified keyring. That logic can make use
>   of this code too.
> 
> Signed-off-by: Vivek Goyal <vgoyal@...hat.com>

My original thought was to use the system keyring, in lieu of having the
multiple keyrings.  Unfortunately, the scope of a key's usage needs to
be limited, which can not be done safely with a single keyring.

Mimi

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