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

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Date:   Thu, 15 Dec 2022 18:02:52 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     David Howells <dhowells@...hat.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>
Cc:     Arnd Bergmann <arnd@...db.de>, Jarkko Sakkinen <jarkko@...nel.org>,
        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: [PATCH] crypto: certs: fix FIPS selftest depenency

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