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    Subject[PATCH 5.10 059/236] certs: Trigger creation of RSA module signing key if its not an RSA key
    Date
    From: Stefan Berger <stefanb@linux.ibm.com>

    [ 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 <dhowells@redhat.com>
    Cc: David Woodhouse <dwmw2@infradead.org>
    Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
    Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
    Tested-by: Jarkko Sakkinen <jarkko@kernel.org>
    Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    certs/Makefile | 8 ++++++++
    1 file changed, 8 insertions(+)

    diff --git a/certs/Makefile b/certs/Makefile
    index b6db52ebf0be..b338799c0b24 100644
    --- a/certs/Makefile
    +++ b/certs/Makefile
    @@ -47,11 +47,19 @@ 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."
    --
    2.30.2


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