[PATCH] ima: ensure IMA_APPRAISE_MODSIG has necessary dependencies
From: Nayna Jain <nayna@linux.ibm.com>
Date: 2021-04-23 01:16:36
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@infradead.org>
Reported-by: Stephen Rothwell <redacted>
Signed-off-by: Nayna Jain <nayna@linux.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