linux-kernel - Re: [PATCH] crypto: certs: fix FIPS selftest depenency

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Date:   Tue, 27 Dec 2022 19:22:38 +0000
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     David Howells <dhowells@...hat.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Arnd Bergmann <arnd@...db.de>,
        Ard Biesheuvel <ardb@...nel.org>,
        Eric Biggers <ebiggers@...gle.com>,
        Vitaly Chikunov <vt@...linux.org>, keyrings@...r.kernel.org,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] crypto: certs: fix FIPS selftest depenency

On Thu, Dec 15, 2022 at 06:02:52PM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> The selftest code is built into the x509_key_parser module, and depends
> on the pkcs7_message_parser module, which in turn has a dependency on
> the key parser, creating a dependency loop and a resulting link
> failure when the pkcs7 code is a loadable module:
> 
> ld: crypto/asymmetric_keys/selftest.o: in function `fips_signature_selftest':
> crypto/asymmetric_keys/selftest.c:205: undefined reference to `pkcs7_parse_message'
> ld: crypto/asymmetric_keys/selftest.c:209: undefined reference to `pkcs7_supply_detached_data'
> ld: crypto/asymmetric_keys/selftest.c:211: undefined reference to `pkcs7_verify'
> ld: crypto/asymmetric_keys/selftest.c:215: undefined reference to `pkcs7_validate_trust'
> ld: crypto/asymmetric_keys/selftest.c:219: undefined reference to `pkcs7_free_message'
> 
> Avoid this by only allowing the selftest to be enabled when either
> both parts are loadable modules, or both are built-in.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  crypto/asymmetric_keys/Kconfig        | 2 +-
>  crypto/asymmetric_keys/pkcs7_verify.c | 1 +
>  2 files changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/crypto/asymmetric_keys/Kconfig b/crypto/asymmetric_keys/Kconfig
> index 3df3fe4ed95f..1ef3b46d6f6e 100644
> --- a/crypto/asymmetric_keys/Kconfig
> +++ b/crypto/asymmetric_keys/Kconfig
> @@ -83,6 +83,6 @@ config FIPS_SIGNATURE_SELFTEST
>  	  for FIPS.
>  	depends on KEYS
>  	depends on ASYMMETRIC_KEY_TYPE
> -	depends on PKCS7_MESSAGE_PARSER
> +	depends on PKCS7_MESSAGE_PARSER=X509_CERTIFICATE_PARSER
>  
>  endif # ASYMMETRIC_KEY_TYPE
> diff --git a/crypto/asymmetric_keys/pkcs7_verify.c b/crypto/asymmetric_keys/pkcs7_verify.c
> index f6321c785714..4fa769c4bcdb 100644
> --- a/crypto/asymmetric_keys/pkcs7_verify.c
> +++ b/crypto/asymmetric_keys/pkcs7_verify.c
> @@ -485,3 +485,4 @@ int pkcs7_supply_detached_data(struct pkcs7_message *pkcs7,
>  	pkcs7->data_len = datalen;
>  	return 0;
>  }
> +EXPORT_SYMBOL_GPL(pkcs7_supply_detached_data);
> -- 
> 2.35.1
> 

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

BR, Jarkko