linux-kernel - [PATCH 1/4] MODSIGN: Simplify Makefile with a Kconfig helper

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Date:	Wed, 23 Jan 2013 16:30:41 +0100
From:	Michal Marek <mmarek@...e.cz>
To:	dhowells@...hat.com, rusty@...abs.org
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH 1/4] MODSIGN: Simplify Makefile with a Kconfig helper

Signed-off-by: Michal Marek <mmarek@...e.cz>
---
 init/Kconfig    |    9 +++++++++
 kernel/Makefile |   24 ++----------------------
 2 files changed, 11 insertions(+), 22 deletions(-)

diff --git a/init/Kconfig b/init/Kconfig
index 6fdd6e3..ba7d1c1 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1634,6 +1634,15 @@ config MODULE_SIG_SHA512
 
 endchoice
 
+config MODULE_SIG_HASH
+	string
+	depends on MODULE_SIG
+	default "sha1" if MODULE_SIG_SHA1
+	default "sha224" if MODULE_SIG_SHA224
+	default "sha256" if MODULE_SIG_SHA256
+	default "sha384" if MODULE_SIG_SHA384
+	default "sha512" if MODULE_SIG_SHA512
+
 endif # MODULES
 
 config INIT_ALL_POSSIBLE
diff --git a/kernel/Makefile b/kernel/Makefile
index 86e3285..740bf4c 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -148,26 +148,6 @@ kernel/modsign_pubkey.o: signing_key.x509 extra_certificates
 # fail and that the kernel may be used afterwards.
 #
 ###############################################################################
-sign_key_with_hash :=
-ifeq ($(CONFIG_MODULE_SIG_SHA1),y)
-sign_key_with_hash := -sha1
-endif
-ifeq ($(CONFIG_MODULE_SIG_SHA224),y)
-sign_key_with_hash := -sha224
-endif
-ifeq ($(CONFIG_MODULE_SIG_SHA256),y)
-sign_key_with_hash := -sha256
-endif
-ifeq ($(CONFIG_MODULE_SIG_SHA384),y)
-sign_key_with_hash := -sha384
-endif
-ifeq ($(CONFIG_MODULE_SIG_SHA512),y)
-sign_key_with_hash := -sha512
-endif
-ifeq ($(sign_key_with_hash),)
-$(error Could not determine digest type to use from kernel config)
-endif
-
 signing_key.priv signing_key.x509: x509.genkey
 	@echo "###"
 	@echo "### Now generating an X.509 key pair to be used for signing modules."
@@ -177,8 +157,8 @@ signing_key.priv signing_key.x509: x509.genkey
 	@echo "### needs to be run as root, and uses a hardware random"
 	@echo "### number generator if one is available."
 	@echo "###"
-	openssl req -new -nodes -utf8 $(sign_key_with_hash) -days 36500 -batch \
-		-x509 -config x509.genkey \
+	openssl req -new -nodes -utf8 -$(CONFIG_MODULE_SIG_HASH) -days 36500 \
+		-batch -x509 -config x509.genkey \
 		-outform DER -out signing_key.x509 \
 		-keyout signing_key.priv
 	@echo "###"
-- 
1.7.10.4

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