[PATCH] certs: Fix wrong kconfig option used for x509_revocation_list

[Eric Snowberg <eric.snowberg@oracle.com>]

This fixes a build issue when x509_revocation_list is not defined.

$ make ARCH=x86_64 O=build64 all

 EXTRACT_CERTS   ../
At main.c:154:
- SSL error:0909006C:PEM routines:get_name:no start line: crypto/pem/pem_lib.c:745
extract-cert: ../: Is a directory
make[2]: [../certs/Makefile:119: certs/x509_revocation_list] Error 1 (ignored)

When the new CONFIG_SYSTEM_REVOCATION_LIST was added [1], it was not carried
into the code for preloading the revocation certificates [2].  Change from
using the original CONFIG_SYSTEM_BLACKLIST_KEYRING  to the new
CONFIG_SYSTEM_REVOCATION_LIST.

[1] https://lore.kernel.org/keyrings/EDA280F9-F72D-4181-93C7-CDBE95976FF7@oracle.com/T/#m562c1b27bf402190e7bb573ad20eff5b6310d08f
[2] https://lore.kernel.org/keyrings/EDA280F9-F72D-4181-93C7-CDBE95976FF7@oracle.com/T/#m07e258bf019ccbac23820fad5192ceffa74fc6ab

Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Eric Snowberg <eric.snowberg@oracle.com>
---
 certs/Makefile    | 7 +++++--
 certs/blacklist.c | 4 ++++
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/certs/Makefile b/certs/Makefile
index e3f4926fd21e..3bc43c88a6d2 100644
--- a/certs/Makefile
+++ b/certs/Makefile
@@ -4,7 +4,10 @@
 #
 
 obj-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += system_keyring.o system_certificates.o common.o
-obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist.o revocation_certificates.o common.o
+obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist.o common.o
+ifeq ($(CONFIG_SYSTEM_REVOCATION_LIST),y)
+obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += revocation_certificates.o
+endif
 ifneq ($(CONFIG_SYSTEM_BLACKLIST_HASH_LIST),"")
 obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist_hashes.o
 else
@@ -105,7 +108,7 @@ $(obj)/signing_key.x509: scripts/extract-cert $(X509_DEP) FORCE
 	$(call if_changed,extract_certs,$(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY))
 endif # CONFIG_MODULE_SIG
 
-ifeq ($(CONFIG_SYSTEM_BLACKLIST_KEYRING),y)
+ifeq ($(CONFIG_SYSTEM_REVOCATION_LIST),y)
 
 $(eval $(call config_filename,SYSTEM_REVOCATION_KEYS))
 
diff --git a/certs/blacklist.c b/certs/blacklist.c
index 723b19c96256..c9a435b15af4 100644
--- a/certs/blacklist.c
+++ b/certs/blacklist.c
@@ -21,8 +21,10 @@
 
 static struct key *blacklist_keyring;
 
+#ifdef CONFIG_SYSTEM_REVOCATION_LIST
 extern __initconst const u8 revocation_certificate_list[];
 extern __initconst const unsigned long revocation_certificate_list_size;
+#endif
 
 /*
  * The description must be a type prefix, a colon and then an even number of
@@ -225,6 +227,7 @@ static int __init blacklist_init(void)
  */
 device_initcall(blacklist_init);
 
+#ifdef CONFIG_SYSTEM_REVOCATION_LIST
 /*
  * Load the compiled-in list of revocation X.509 certificates.
  */
@@ -237,3 +240,4 @@ static __init int load_revocation_certificate_list(void)
 				     blacklist_keyring);
 }
 late_initcall(load_revocation_certificate_list);
+#endif
-- 
2.18.4