linux-kernel - Re: [PATCH v2] KEYS: trusted: Fix trusted key backends when building as module

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Message-ID: <20210730010242.4hbx7ehk5d5xllvp@kernel.org>
Date:   Fri, 30 Jul 2021 04:02:42 +0300
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Andreas Rammhold <andreas@...mhold.de>
Cc:     James Bottomley <jejb@...ux.ibm.com>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        David Howells <dhowells@...hat.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Sumit Garg <sumit.garg@...aro.org>,
        Ahmad Fatoum <a.fatoum@...gutronix.de>,
        linux-integrity@...r.kernel.org, keyrings@...r.kernel.org,
        linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] KEYS: trusted: Fix trusted key backends when building
 as module

On Thu, Jul 29, 2021 at 08:33:32PM +0200, Andreas Rammhold wrote:
> Before this commit the kernel could end up with no trusted key sources
> even though both of the currently supported backends (TPM and TEE) were
> compiled as modules. This manifested in the trusted key type not being
> registered at all.
> 
> When checking if a CONFIG_… preprocessor variable is defined we only
> test for the builtin (=y) case and not the module (=m) case. By using
> the IS_REACHABLE() macro we do test for both cases.
> 
> 
> v2:
> * Fixed commit message
> * Switched from IS_DEFINED() to IS_REACHABLE()

Please put these below '---' because otherwise they included to the commit
log.

> Fixes: 5d0682be3189 ("KEYS: trusted: Add generic trusted keys framework")
> Signed-off-by: Andreas Rammhold <andreas@...mhold.de>
> ---
> 
> Here is the version that was proposed by Ahmad [1] in response to the
> feedback received in the "[PATCH v2] KEYS: trusted: fix use as module
> when CONFIG_TCG_TPM=m" discussion [2].
> 
> I have tested both of the patches on v5.13 and they both fix the problem
> I originally encountered.
> 
> [1] https://lore.kernel.org/keyrings/fe39a449-88df-766b-a13a-290f4847d43e@pengutronix.de/
> [2] https://lore.kernel.org/keyrings/20210721160258.7024-1-a.fatoum@pengutronix.de/
> 
> 
>  security/keys/trusted-keys/trusted_core.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/security/keys/trusted-keys/trusted_core.c b/security/keys/trusted-keys/trusted_core.c
> index d5c891d8d353..5b35f1b87644 100644
> --- a/security/keys/trusted-keys/trusted_core.c
> +++ b/security/keys/trusted-keys/trusted_core.c
> @@ -27,10 +27,10 @@ module_param_named(source, trusted_key_source, charp, 0);
>  MODULE_PARM_DESC(source, "Select trusted keys source (tpm or tee)");
>  
>  static const struct trusted_key_source trusted_key_sources[] = {
> -#if defined(CONFIG_TCG_TPM)
> +#if IS_REACHABLE(CONFIG_TCG_TPM)
>  	{ "tpm", &trusted_key_tpm_ops },
>  #endif
> -#if defined(CONFIG_TEE)
> +#if IS_REACHABLE(CONFIG_TEE)
>  	{ "tee", &trusted_key_tee_ops },
>  #endif
>  };
> -- 
> 2.32.0
> 
>

Can you send a one more v3 without the changelog in the commit message
and also add

Reviewed-by: Jarkko Sakkinen <jarkko@...nel.org>

/Jarkko