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-rw-r--r--kernel/Makefile77
1 files changed, 77 insertions, 0 deletions
diff --git a/kernel/Makefile b/kernel/Makefile
index 5404911eaee..0dfeca4324e 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -54,6 +54,7 @@ obj-$(CONFIG_DEBUG_SPINLOCK) += spinlock.o
obj-$(CONFIG_PROVE_LOCKING) += spinlock.o
obj-$(CONFIG_UID16) += uid16.o
obj-$(CONFIG_MODULES) += module.o
+obj-$(CONFIG_MODULE_SIG) += module_signing.o modsign_pubkey.o
obj-$(CONFIG_KALLSYMS) += kallsyms.o
obj-$(CONFIG_BSD_PROCESS_ACCT) += acct.o
obj-$(CONFIG_KEXEC) += kexec.o
@@ -130,3 +131,79 @@ quiet_cmd_timeconst = TIMEC $@
targets += timeconst.h
$(obj)/timeconst.h: $(src)/timeconst.pl FORCE
$(call if_changed,timeconst)
+
+ifeq ($(CONFIG_MODULE_SIG),y)
+#
+# Pull the signing certificate and any extra certificates into the kernel
+#
+extra_certificates:
+ touch $@
+
+kernel/modsign_pubkey.o: signing_key.x509 extra_certificates
+
+###############################################################################
+#
+# If module signing is requested, say by allyesconfig, but a key has not been
+# supplied, then one will need to be generated to make sure the build does not
+# fail and that the kernel may be used afterwards.
+#
+###############################################################################
+sign_key_with_hash :=
+ifeq ($(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."
+ @echo "###"
+ @echo "### If this takes a long time, you might wish to run rngd in the"
+ @echo "### background to keep the supply of entropy topped up. It"
+ @echo "### needs to be run as root, and should use a hardware random"
+ @echo "### number generator if one is available, eg:"
+ @echo "###"
+ @echo "### rngd -r /dev/hwrandom"
+ @echo "###"
+ openssl req -new -nodes -utf8 $(sign_key_with_hash) -days 36500 -batch \
+ -x509 -config x509.genkey \
+ -outform DER -out signing_key.x509 \
+ -keyout signing_key.priv
+ @echo "###"
+ @echo "### Key pair generated."
+ @echo "###"
+
+x509.genkey:
+ @echo Generating X.509 key generation config
+ @echo >x509.genkey "[ req ]"
+ @echo >>x509.genkey "default_bits = 4096"
+ @echo >>x509.genkey "distinguished_name = req_distinguished_name"
+ @echo >>x509.genkey "prompt = no"
+ @echo >>x509.genkey "string_mask = utf8only"
+ @echo >>x509.genkey "x509_extensions = myexts"
+ @echo >>x509.genkey
+ @echo >>x509.genkey "[ req_distinguished_name ]"
+ @echo >>x509.genkey "O = Magrathea"
+ @echo >>x509.genkey "CN = Glacier signing key"
+ @echo >>x509.genkey "emailAddress = slartibartfast@magrathea.h2g2"
+ @echo >>x509.genkey
+ @echo >>x509.genkey "[ myexts ]"
+ @echo >>x509.genkey "basicConstraints=critical,CA:FALSE"
+ @echo >>x509.genkey "keyUsage=digitalSignature"
+ @echo >>x509.genkey "subjectKeyIdentifier=hash"
+ @echo >>x509.genkey "authorityKeyIdentifier=keyid"
+endif