certs: Move load_certificate_list() to be with the asymmetric keys code

Move load_certificate_list(), which loads a series of binary X.509
certificates from a blob and inserts them as keys into a keyring, to be
with the asymmetric keys code that it drives.

This makes it easier to add FIPS selftest code in which we need to load up
a private keyring for the tests to use.

Signed-off-by: David Howells <[e-mail]>
Reviewed-by: Simo Sorce <[e-mail]>
Reviewed-by: Herbert Xu <[e-mail]>
cc: [e-mail]
cc: [e-mail]
Link: https://lore.kernel.org/r/[e-mail]/

certs/Makefile

···
 # Makefile for the linux kernel signature checking certificates.
 #
 
-obj-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += system_keyring.o system_certificates.o common.o
-obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist.o common.o
+obj-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += system_keyring.o system_certificates.o
+obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist.o
 obj-$(CONFIG_SYSTEM_REVOCATION_LIST) += revocation_certificates.o
 ifneq ($(CONFIG_SYSTEM_BLACKLIST_HASH_LIST),)
 quiet_cmd_check_blacklist_hashes = CHECK   $(patsubst "%",%,$(2))

certs/blacklist.c

···
 #include <linux/err.h>
 #include <linux/seq_file.h>
 #include <linux/uidgid.h>
-#include <linux/verification.h>
+#include <keys/asymmetric-type.h>
 #include <keys/system_keyring.h>
 #include "blacklist.h"
-#include "common.h"
 
 /*
  * According to crypto/asymmetric_keys/x509_cert_parser.c:x509_note_pkey_algo(),
···
 	if (revocation_certificate_list_size)
 		pr_notice("Loading compiled-in revocation X.509 certificates\n");
 
-	return load_certificate_list(revocation_certificate_list, revocation_certificate_list_size,
-				     blacklist_keyring);
+	return x509_load_certificate_list(revocation_certificate_list,
+					  revocation_certificate_list_size,
+					  blacklist_keyring);
 }
 late_initcall(load_revocation_certificate_list);
 #endif

certs/common.c crypto/asymmetric_keys/x509_loader.c

···
 
 #include <linux/kernel.h>
 #include <linux/key.h>
-#include "common.h"
+#include <keys/asymmetric-type.h>
 
-int load_certificate_list(const u8 cert_list[],
-			  const unsigned long list_size,
-			  const struct key *keyring)
+int x509_load_certificate_list(const u8 cert_list[],
+			       const unsigned long list_size,
+			       const struct key *keyring)
 {
 	key_ref_t key;
 	const u8 *p, *end;

certs/common.h

···
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-
-#ifndef _CERT_COMMON_H
-#define _CERT_COMMON_H
-
-int load_certificate_list(const u8 cert_list[], const unsigned long list_size,
-			  const struct key *keyring);
-
-#endif

certs/system_keyring.c

···
 #include <keys/asymmetric-type.h>
 #include <keys/system_keyring.h>
 #include <crypto/pkcs7.h>
-#include "common.h"
 
 static struct key *builtin_trusted_keys;
 #ifdef CONFIG_SECONDARY_TRUSTED_KEYRING
···
 
 	pr_notice("Loading compiled-in module X.509 certificates\n");
 
-	return load_certificate_list(system_certificate_list, module_cert_size, keyring);
+	return x509_load_certificate_list(system_certificate_list,
+					  module_cert_size, keyring);
 }
 
 /*
···
 	size = system_certificate_list_size - module_cert_size;
 #endif
 
-	return load_certificate_list(p, size, builtin_trusted_keys);
+	return x509_load_certificate_list(p, size, builtin_trusted_keys);
 }
 late_initcall(load_system_certificate_list);
 

crypto/asymmetric_keys/Makefile

···
 	x509.asn1.o \
 	x509_akid.asn1.o \
 	x509_cert_parser.o \
+	x509_loader.o \
 	x509_public_key.o
 
 $(obj)/x509_cert_parser.o: \

include/keys/asymmetric-type.h

···
 				       const struct asymmetric_key_id *id_2,
 				       bool partial);
 
+int x509_load_certificate_list(const u8 cert_list[], const unsigned long list_size,
+			       const struct key *keyring);
+
 /*
  * The payload is at the discretion of the subtype.
  */