linux-kernel - Re: [PATCH] IMA: add INTEGRITY_ASYMMETRIC

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Date:	Mon, 18 Apr 2016 19:00:30 -0400
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
	James Morris <james.l.morris@...cle.com>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	Petko Manolov <petkan@...-labs.com>,
	David Howells <dhowells@...hat.com>,
	linux-ima-devel@...ts.sourceforge.net,
	linux-ima-user@...ts.sourceforge.net,
	linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] IMA: add INTEGRITY_ASYMMETRIC_KEYS dependency

Hi Arnd,

On Sat, 2016-04-16 at 22:33 +0200, Arnd Bergmann wrote:
> The newly added CONFIG_IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY
> option only makes sense in combination with INTEGRITY_ASYMMETRIC_KEYS,
> otherwise we get a build error:
> 
> warning: (IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY) selects INTEGRITY_TRUSTED_KEYRING which has unmet direct dependencies (INTEGRITY && SYSTEM_TRUSTED_KEYRING && INTEGRITY_ASYMMETRIC_KEYS)
> security/integrity/evm/evm_main.c: In function 'evm_load_x509':
> security/integrity/evm/evm_main.c:494:7: error: implicit declaration of function 'integrity_load_x509'
>   rc = integrity_load_x509(INTEGRITY_KEYRING_EVM, CONFIG_EVM_X509_PATH);
> 
> This adds a Kconfig dependency.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Fixes: 9e1bbe8b8992 ("IMA: Use the the system trusted keyrings instead of .ima_mok")
> ---
>  security/integrity/ima/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/security/integrity/ima/Kconfig b/security/integrity/ima/Kconfig
> index aab9b0a53edf..5487827fa86c 100644
> --- a/security/integrity/ima/Kconfig
> +++ b/security/integrity/ima/Kconfig
> @@ -159,6 +159,7 @@ config IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY
>  	bool "Permit keys validly signed by a built-in or secondary CA cert (EXPERIMENTAL)"
>  	depends on SYSTEM_TRUSTED_KEYRING
>  	depends on SECONDARY_TRUSTED_KEYRING
> +	depends on INTEGRITY_ASYMMETRIC_KEYS
>  	select INTEGRITY_TRUSTED_KEYRING
>  	default n
>  	help

Good catch!  Thank you for reporting the problem.

Enabling this Kconfig option only makes sense if IMA_TRUSTED_KEYRING is
enabled.  I think adding that dependency will resolve the build issues.

Mimi