From 3ee550f12c1529a023f71c9b5becb3351911047b Mon Sep 17 00:00:00 2001 From: David Woodhouse Date: Fri, 14 Aug 2015 16:17:16 +0100 Subject: [PATCH] modsign: Handle signing key in source tree Since commit 1329e8cc69 ("modsign: Extract signing cert from CONFIG_MODULE_SIG_KEY if needed"), the build system has carefully coped with the signing key being specified as a relative path in either the source or or the build trees. However, the actual signing of modules has not worked if the filename is relative to the source tree. Fix that by moving the config_filename helper into scripts/Kbuild.include so that it can be used from elsewhere, and then using it in the top-level Makefile to find the signing key file. Kill the intermediate $(MODPUBKEY) and $(MODSECKEY) variables too, while we're at it. There's no need for them. Signed-off-by: David Woodhouse Signed-off-by: David Howells --- Makefile | 7 +++--- certs/Makefile | 54 ------------------------------------------ scripts/Kbuild.include | 51 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 54 insertions(+), 58 deletions(-) diff --git a/Makefile b/Makefile index 2341942feb85..7c90dda898f6 100644 --- a/Makefile +++ b/Makefile @@ -870,10 +870,9 @@ INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y) ifdef CONFIG_MODULE_SIG_ALL -MODSECKEY = $(CONFIG_MODULE_SIG_KEY) -MODPUBKEY = certs/signing_key.x509 -export MODPUBKEY -mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY) +$(eval $(call config_filename,MODULE_SIG_KEY)) + +mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 else mod_sign_cmd = true endif diff --git a/certs/Makefile b/certs/Makefile index 3c782d025c36..28ac694dd11a 100644 --- a/certs/Makefile +++ b/certs/Makefile @@ -4,60 +4,6 @@ obj-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += system_keyring.o system_certificates.o -############################################################################### -# -# When a Kconfig string contains a filename, it is suitable for -# passing to shell commands. It is surrounded by double-quotes, and -# any double-quotes or backslashes within it are escaped by -# backslashes. -# -# This is no use for dependencies or $(wildcard). We need to strip the -# surrounding quotes and the escaping from quotes and backslashes, and -# we *do* need to escape any spaces in the string. So, for example: -# -# Usage: $(eval $(call config_filename,FOO)) -# -# Defines FOO_FILENAME based on the contents of the CONFIG_FOO option, -# transformed as described above to be suitable for use within the -# makefile. -# -# Also, if the filename is a relative filename and exists in the source -# tree but not the build tree, define FOO_SRCPREFIX as $(srctree)/ to -# be prefixed to *both* command invocation and dependencies. -# -# Note: We also print the filenames in the quiet_cmd_foo text, and -# perhaps ought to have a version specially escaped for that purpose. -# But it's only cosmetic, and $(patsubst "%",%,$(CONFIG_FOO)) is good -# enough. It'll strip the quotes in the common case where there's no -# space and it's a simple filename, and it'll retain the quotes when -# there's a space. There are some esoteric cases in which it'll print -# the wrong thing, but we don't really care. The actual dependencies -# and commands *do* get it right, with various combinations of single -# and double quotes, backslashes and spaces in the filenames. -# -############################################################################### -# -quote := $(firstword " ") -space := -space += -space_escape := %%%SPACE%%% -# -define config_filename -ifneq ($$(CONFIG_$(1)),"") -$(1)_FILENAME := $$(subst \\,\,$$(subst \$$(quote),$$(quote),$$(subst $$(space_escape),\$$(space),$$(patsubst "%",%,$$(subst $$(space),$$(space_escape),$$(CONFIG_$(1))))))) -ifneq ($$(patsubst /%,%,$$(firstword $$($(1)_FILENAME))),$$(firstword $$($(1)_FILENAME))) -else -ifeq ($$(wildcard $$($(1)_FILENAME)),) -ifneq ($$(wildcard $$(srctree)/$$($(1)_FILENAME)),) -$(1)_SRCPREFIX := $(srctree)/ -endif -endif -endif -endif -endef -# -############################################################################### - ifeq ($(CONFIG_SYSTEM_TRUSTED_KEYRING),y) $(eval $(call config_filename,SYSTEM_TRUSTED_KEYS)) diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include index d3437b82ac25..608ac65c61e3 100644 --- a/scripts/Kbuild.include +++ b/scripts/Kbuild.include @@ -303,3 +303,54 @@ why = \ echo-why = $(call escsq, $(strip $(why))) endif + +############################################################################### +# +# When a Kconfig string contains a filename, it is suitable for +# passing to shell commands. It is surrounded by double-quotes, and +# any double-quotes or backslashes within it are escaped by +# backslashes. +# +# This is no use for dependencies or $(wildcard). We need to strip the +# surrounding quotes and the escaping from quotes and backslashes, and +# we *do* need to escape any spaces in the string. So, for example: +# +# Usage: $(eval $(call config_filename,FOO)) +# +# Defines FOO_FILENAME based on the contents of the CONFIG_FOO option, +# transformed as described above to be suitable for use within the +# makefile. +# +# Also, if the filename is a relative filename and exists in the source +# tree but not the build tree, define FOO_SRCPREFIX as $(srctree)/ to +# be prefixed to *both* command invocation and dependencies. +# +# Note: We also print the filenames in the quiet_cmd_foo text, and +# perhaps ought to have a version specially escaped for that purpose. +# But it's only cosmetic, and $(patsubst "%",%,$(CONFIG_FOO)) is good +# enough. It'll strip the quotes in the common case where there's no +# space and it's a simple filename, and it'll retain the quotes when +# there's a space. There are some esoteric cases in which it'll print +# the wrong thing, but we don't really care. The actual dependencies +# and commands *do* get it right, with various combinations of single +# and double quotes, backslashes and spaces in the filenames. +# +############################################################################### +# +space_escape := %%%SPACE%%% +# +define config_filename +ifneq ($$(CONFIG_$(1)),"") +$(1)_FILENAME := $$(subst \\,\,$$(subst \$$(quote),$$(quote),$$(subst $$(space_escape),\$$(space),$$(patsubst "%",%,$$(subst $$(space),$$(space_escape),$$(CONFIG_$(1))))))) +ifneq ($$(patsubst /%,%,$$(firstword $$($(1)_FILENAME))),$$(firstword $$($(1)_FILENAME))) +else +ifeq ($$(wildcard $$($(1)_FILENAME)),) +ifneq ($$(wildcard $$(srctree)/$$($(1)_FILENAME)),) +$(1)_SRCPREFIX := $(srctree)/ +endif +endif +endif +endif +endef +# +############################################################################### -- 2.34.1