From 013177ccc4c5d1a2437545655d912d2844bd64db Mon Sep 17 00:00:00 2001 From: Stefan Berger Date: Tue, 29 Jun 2021 17:34:20 -0400 Subject: [PATCH] certs: Trigger creation of RSA module signing key if it's not an RSA key [ Upstream commit ea35e0d5df6c92fa2e124bb1b91d09b2240715ba ] Address a kbuild issue where a developer created an ECDSA key for signing kernel modules and then builds an older version of the kernel, when bi- secting the kernel for example, that does not support ECDSA keys. If openssl is installed, trigger the creation of an RSA module signing key if it is not an RSA key. Fixes: cfc411e7fff3 ("Move certificate handling to its own directory") Cc: David Howells Cc: David Woodhouse Signed-off-by: Stefan Berger Reviewed-by: Jarkko Sakkinen Tested-by: Jarkko Sakkinen Signed-off-by: Jarkko Sakkinen Signed-off-by: Sasha Levin --- certs/Makefile | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/certs/Makefile b/certs/Makefile index f4b90bad8690..2baef6fba029 100644 --- a/certs/Makefile +++ b/certs/Makefile @@ -46,11 +46,19 @@ endif redirect_openssl = 2>&1 quiet_redirect_openssl = 2>&1 silent_redirect_openssl = 2>/dev/null +openssl_available = $(shell openssl help 2>/dev/null && echo yes) # We do it this way rather than having a boolean option for enabling an # external private key, because 'make randconfig' might enable such a # boolean option and we unfortunately can't make it depend on !RANDCONFIG. ifeq ($(CONFIG_MODULE_SIG_KEY),"certs/signing_key.pem") + +ifeq ($(openssl_available),yes) +X509TEXT=$(shell openssl x509 -in "certs/signing_key.pem" -text 2>/dev/null) + +$(if $(findstring rsaEncryption,$(X509TEXT)),,$(shell rm -f "certs/signing_key.pem")) +endif + $(obj)/signing_key.pem: $(obj)/x509.genkey @$(kecho) "###" @$(kecho) "### Now generating an X.509 key pair to be used for signing modules."