modsign: Handle signing key in source tree
Since commit 1329e8cc ("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: NDavid Woodhouse <David.Woodhouse@intel.com> Signed-off-by: NDavid Howells <dhowells@redhat.com>
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