linux-kernel - Re: [PATCH 6/8] evm: enable key retention service automatically

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Date:	Mon, 03 Mar 2014 21:02:16 -0500
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	Dmitry Kasatkin <d.kasatkin@...sung.com>
Cc:	linux-security-module@...r.kernel.org, jmorris@...ei.org,
	linux-kernel@...r.kernel.org, casey.schaufler@...el.com,
	dmitry.kasatkin@...il.com
Subject: Re: [PATCH 6/8] evm: enable key retention service automatically

On Fri, 2014-02-28 at 16:59 +0200, Dmitry Kasatkin wrote: 
> If keys are not enabled, EVM is not visible in the configuration menu.
> It may be difficult to figure out what to do unless  you really know.
> 
> Other subsystems as NFS, CIFS select keys automatically.
> This patch does the same.
> 
> Signed-off-by: Dmitry Kasatkin <d.kasatkin@...sung.com>
> ---
>  security/integrity/evm/Kconfig | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/security/integrity/evm/Kconfig b/security/integrity/evm/Kconfig
> index 5aa9103..d35b491 100644
> --- a/security/integrity/evm/Kconfig
> +++ b/security/integrity/evm/Kconfig
> @@ -1,9 +1,10 @@
>  config EVM
>  	boolean "EVM support"
> -	depends on SECURITY && KEYS && (TRUSTED_KEYS=y || TRUSTED_KEYS=n)

Including KEYS is fine, but the trusted-keys dependency is still
required.  If trusted-keys is enabled, then the TPM and trusted-keys
must be builtin.

Mimi

> +	depends on SECURITY
> +	select KEYS
> +	select ENCRYPTED_KEYS
>  	select CRYPTO_HMAC
>  	select CRYPTO_SHA1
> -	select ENCRYPTED_KEYS
>  	default n
>  	help
>  	  EVM protects a file's security extended attributes against


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