modsign: Use extract-cert to process CONFIG_SYSTEM_TRUSTED_KEYS

Fix up the dependencies somewhat too, while we're at it.
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: David Howells <dhowells@redhat.com>

kernel/Makefile

@@ -166,23 +166,22 @@ endef
 #
 ###############################################################################
 
-
 ifeq ($(CONFIG_SYSTEM_TRUSTED_KEYRING),y)
 
 $(eval $(call config_filename,SYSTEM_TRUSTED_KEYS))
 
-SIGNING_X509-$(CONFIG_MODULE_SIG) += signing_key.x509
-
-kernel/system_certificates.o: $(obj)/x509_certificate_list
+# GCC doesn't include .incbin files in -MD generated dependencies (PR#66871)
+$(obj)/system_certificates.o: $(obj)/x509_certificate_list
 
-quiet_cmd_x509certs  = CERTS   $(SIGNING_X509-y) $(patsubst "%",%,$(2))
-      cmd_x509certs  = ( cat $(SIGNING_X509-y) /dev/null; \
-			 awk '/-----BEGIN CERTIFICATE-----/{flag=1;next}/-----END CERTIFICATE-----/{flag=0}flag' $(2) /dev/null | base64 -d ) > $@ || ( rm $@; exit 1)
+# Cope with signing_key.x509 existing in $(srctree) not $(objtree)
+AFLAGS_system_certificates.o := -I$(srctree)
 
-targets += $(obj)/x509_certificate_list
-$(obj)/x509_certificate_list: $(SIGNING_X509-y) include/config/system/trusted/keys.h $(wildcard include/config/module/sig.h) $(SYSTEM_TRUSTED_KEYS_SRCPREFIX)$(SYSTEM_TRUSTED_KEYS_FILENAME)
-	$(call if_changed,x509certs,$(SYSTEM_TRUSTED_KEYS_SRCPREFIX)$(CONFIG_SYSTEM_TRUSTED_KEYS))
+quiet_cmd_extract_certs  = EXTRACT_CERTS   $(patsubst "%",%,$(2))
+      cmd_extract_certs  = scripts/extract-cert $(2) $@ || ( rm $@; exit 1)
 
+targets += x509_certificate_list
+$(obj)/x509_certificate_list: scripts/extract-cert $(SYSTEM_TRUSTED_KEYS_SRCPREFIX)$(SYSTEM_TRUSTED_KEYS_FILENAME) FORCE
+	$(call if_changed,extract_certs,$(SYSTEM_TRUSTED_KEYS_SRCPREFIX)$(CONFIG_SYSTEM_TRUSTED_KEYS))
 endif
 
 clean-files := x509_certificate_list .x509.list
@@ -248,9 +247,9 @@ ifeq ($(patsubst pkcs11:%,%,$(firstword $(MODULE_SIG_KEY_FILENAME))),$(firstword
 X509_DEP := $(MODULE_SIG_KEY_SRCPREFIX)$(MODULE_SIG_KEY_FILENAME)
 endif
 
-quiet_cmd_extract_der = SIGNING_CERT $(patsubst "%",%,$(2))
-      cmd_extract_der = scripts/extract-cert $(2) signing_key.x509
+# GCC PR#66871 again.
+$(obj)/system_certificates.o: signing_key.x509
 
 signing_key.x509: scripts/extract-cert include/config/module/sig/key.h $(X509_DEP)
-	$(call cmd,extract_der,$(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY))
+	$(call cmd,extract_certs,$(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY))
 endif

kernel/system_certificates.S

@@ -7,6 +7,9 @@
 	.globl VMLINUX_SYMBOL(system_certificate_list)
 VMLINUX_SYMBOL(system_certificate_list):
 __cert_list_start:
+#ifdef CONFIG_MODULE_SIG
+	.incbin "signing_key.x509"
+#endif
 	.incbin "kernel/x509_certificate_list"
 __cert_list_end:
 

scripts/Makefile

@@ -16,7 +16,8 @@ hostprogs-$(CONFIG_VT)           += conmakehash
 hostprogs-$(BUILD_C_RECORDMCOUNT) += recordmcount
 hostprogs-$(CONFIG_BUILDTIME_EXTABLE_SORT) += sortextable
 hostprogs-$(CONFIG_ASN1)	 += asn1_compiler
-hostprogs-$(CONFIG_MODULE_SIG)	 += sign-file extract-cert
+hostprogs-$(CONFIG_MODULE_SIG)	 += sign-file
+hostprogs-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += extract-cert
 
 HOSTCFLAGS_sortextable.o = -I$(srctree)/tools/include
 HOSTCFLAGS_asn1_compiler.o = -I$(srctree)/include