linux-kernel - [PATCH] ima: ensure IMA_APPRAISE_MODSIG has necessary dependencies

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Date:   Thu, 22 Apr 2021 21:16:02 -0400
From:   Nayna Jain <nayna@...ux.ibm.com>
To:     linux-integrity@...r.kernel.org, keyrings@...r.kernel.org
Cc:     linux-security-module@...r.kernel.org,
        David Howells <dhowells@...hat.com>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Stefan Berger <stefanb@...ux.ibm.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        Arnd Bergmann <arnd@...nel.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Nayna Jain <nayna@...ux.ibm.com>
Subject: [PATCH] ima: ensure IMA_APPRAISE_MODSIG has necessary dependencies

IMA_APPRAISE_MODSIG is used for verifying the integrity of both kernel
and modules. Enabling IMA_APPRAISE_MODSIG without MODULES causes a build
break.

Ensure the build time kernel signing key is only generated if both
IMA_APPRAISE_MODSIG and MODULES are enabled.

Fixes: 0165f4ca223b ("ima: enable signing of modules with build time generated key") 
Reported-by: Randy Dunlap <rdunlap@...radead.org> 
Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
Signed-off-by: Nayna Jain <nayna@...ux.ibm.com>
---
 certs/Kconfig               | 2 +-
 certs/Makefile              | 2 ++
 certs/system_certificates.S | 3 ++-
 3 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/certs/Kconfig b/certs/Kconfig
index 48675ad319db..e4d00348fd73 100644
--- a/certs/Kconfig
+++ b/certs/Kconfig
@@ -4,7 +4,7 @@ menu "Certificates for signature checking"
 config MODULE_SIG_KEY
 	string "File name or PKCS#11 URI of module signing key"
 	default "certs/signing_key.pem"
-	depends on MODULE_SIG || IMA_APPRAISE_MODSIG
+	depends on MODULE_SIG || (IMA_APPRAISE_MODSIG && MODULES)
 	help
          Provide the file name of a private key/certificate in PEM format,
          or a PKCS#11 URI according to RFC7512. The file should contain, or
diff --git a/certs/Makefile b/certs/Makefile
index e3185c57fbd8..2f369d6aa494 100644
--- a/certs/Makefile
+++ b/certs/Makefile
@@ -36,8 +36,10 @@ ifeq ($(CONFIG_MODULE_SIG),y)
 endif
 
 ifeq ($(CONFIG_IMA_APPRAISE_MODSIG),y)
+ifeq ($(CONFIG_MODULES),y)
 	SIGN_KEY = y
 endif
+endif
 
 ifdef SIGN_KEY
 ###############################################################################
diff --git a/certs/system_certificates.S b/certs/system_certificates.S
index dcad27ea8527..e1645e6f4d97 100644
--- a/certs/system_certificates.S
+++ b/certs/system_certificates.S
@@ -9,7 +9,8 @@
 system_certificate_list:
 __cert_list_start:
 __module_cert_start:
-#if defined(CONFIG_MODULE_SIG) || defined(CONFIG_IMA_APPRAISE_MODSIG)
+#if defined(CONFIG_MODULE_SIG) || (defined(CONFIG_IMA_APPRAISE_MODSIG) \
+			       && defined(CONFIG_MODULES))
 	.incbin "certs/signing_key.x509"
 #endif
 __module_cert_end:
-- 
2.29.2