[PATCH] security/integrity: remove unnecessary 'init_keyring' variable

[Eric Biggers <ebiggers@kernel.org>]

From: Eric Biggers <ebiggers@google.com>

The 'init_keyring' variable actually just gave the value of
CONFIG_INTEGRITY_TRUSTED_KEYRING.  We should check the config option
directly instead.  No change in behavior; this just simplifies the code.

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 security/integrity/digsig.c    | 11 ++---------
 security/integrity/integrity.h |  9 +++++----
 2 files changed, 7 insertions(+), 13 deletions(-)

diff --git a/security/integrity/digsig.c b/security/integrity/digsig.c
index 879396fa3be0..9e6adbd1ad42 100644
--- a/security/integrity/digsig.c
+++ b/security/integrity/digsig.c
@@ -37,12 +37,6 @@ static const char * const keyring_name[INTEGRITY_KEYRING_MAX] = {
 	"_module",
 };
 
-#ifdef CONFIG_INTEGRITY_TRUSTED_KEYRING
-static bool init_keyring __initdata = true;
-#else
-static bool init_keyring __initdata;
-#endif
-
 #ifdef CONFIG_IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY
 #define restrict_link_to_ima restrict_link_by_builtin_and_secondary_trusted
 #else
@@ -79,15 +73,13 @@ int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
 	return -EOPNOTSUPP;
 }
 
+#ifdef CONFIG_INTEGRITY_TRUSTED_KEYRING
 int __init integrity_init_keyring(const unsigned int id)
 {
 	const struct cred *cred = current_cred();
 	struct key_restriction *restriction;
 	int err = 0;
 
-	if (!init_keyring)
-		return 0;
-
 	restriction = kzalloc(sizeof(struct key_restriction), GFP_KERNEL);
 	if (!restriction)
 		return -ENOMEM;
@@ -109,6 +101,7 @@ int __init integrity_init_keyring(const unsigned int id)
 	}
 	return err;
 }
+#endif /* CONFIG_INTEGRITY_TRUSTED_KEYRING */
 
 int __init integrity_load_x509(const unsigned int id, const char *path)
 {
diff --git a/security/integrity/integrity.h b/security/integrity/integrity.h
index e60473b13a8d..37ab908cfb6e 100644
--- a/security/integrity/integrity.h
+++ b/security/integrity/integrity.h
@@ -147,26 +147,27 @@ int integrity_kernel_read(struct file *file, loff_t offset,
 extern struct dentry *integrity_dir;
 
 #ifdef CONFIG_INTEGRITY_SIGNATURE
-
 int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
 			    const char *digest, int digestlen);
 
-int __init integrity_init_keyring(const unsigned int id);
 int __init integrity_load_x509(const unsigned int id, const char *path);
 #else
-
 static inline int integrity_digsig_verify(const unsigned int id,
 					  const char *sig, int siglen,
 					  const char *digest, int digestlen)
 {
 	return -EOPNOTSUPP;
 }
+#endif /* CONFIG_INTEGRITY_SIGNATURE */
 
+#ifdef CONFIG_INTEGRITY_TRUSTED_KEYRING
+int __init integrity_init_keyring(const unsigned int id);
+#else
 static inline int integrity_init_keyring(const unsigned int id)
 {
 	return 0;
 }
-#endif /* CONFIG_INTEGRITY_SIGNATURE */
+#endif
 
 #ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS
 int asymmetric_verify(struct key *keyring, const char *sig,
-- 
2.19.0.rc2.392.g5ba43deb5a-goog