linux-kernel - [PATCH 5.4 040/144] certs: Trigger creation of RSA module signing key if its not an RSA key

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20210913131049.286580985@linuxfoundation.org>
Date:   Mon, 13 Sep 2021 15:13:41 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, David Howells <dhowells@...hat.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Stefan Berger <stefanb@...ux.ibm.com>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 040/144] certs: Trigger creation of RSA module signing key if its not an RSA key

From: Stefan Berger <stefanb@...ux.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@...hat.com>
Cc: David Woodhouse <dwmw2@...radead.org>
Signed-off-by: Stefan Berger <stefanb@...ux.ibm.com>
Reviewed-by: Jarkko Sakkinen <jarkko@...nel.org>
Tested-by: Jarkko Sakkinen <jarkko@...nel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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."
-- 
2.30.2