[PATCH v3 08/14] KEYS: add a reference to mok keyring

[Eric Snowberg <eric.snowberg@oracle.com>]

Expose the .mok keyring created in integrity code by adding
a reference.  This makes the mok keyring accessible for keyring
restrictions in the future.

Signed-off-by: Eric Snowberg <eric.snowberg@oracle.com>
---
v2: Initial version
v3: set_mok_trusted_keys only available when secondary is enabled
---
 certs/system_keyring.c        | 5 +++++
 include/keys/system_keyring.h | 4 ++++
 2 files changed, 9 insertions(+)

diff --git a/certs/system_keyring.c b/certs/system_keyring.c
index 692365dee2bd..2baf5447b116 100644
--- a/certs/system_keyring.c
+++ b/certs/system_keyring.c
@@ -21,6 +21,7 @@
 static struct key *builtin_trusted_keys;
 #ifdef CONFIG_SECONDARY_TRUSTED_KEYRING
 static struct key *secondary_trusted_keys;
+static struct key *mok_trusted_keys;
 #endif
 #ifdef CONFIG_INTEGRITY_PLATFORM_KEYRING
 static struct key *platform_trusted_keys;
@@ -90,6 +91,10 @@ static __init struct key_restriction *get_builtin_and_secondary_restriction(void
 
 	return restriction;
 }
+void __init set_mok_trusted_keys(struct key *keyring)
+{
+	mok_trusted_keys = keyring;
+}
 #endif
 
 /*
diff --git a/include/keys/system_keyring.h b/include/keys/system_keyring.h
index 6acd3cf13a18..4fe9cca58685 100644
--- a/include/keys/system_keyring.h
+++ b/include/keys/system_keyring.h
@@ -34,8 +34,12 @@ extern int restrict_link_by_builtin_and_secondary_trusted(
 	const struct key_type *type,
 	const union key_payload *payload,
 	struct key *restriction_key);
+extern void __init set_mok_trusted_keys(struct key *keyring);
 #else
 #define restrict_link_by_builtin_and_secondary_trusted restrict_link_by_builtin_trusted
+static inline void __init set_mok_trusted_keys(struct key *keyring)
+{
+}
 #endif
 
 extern struct pkcs7_message *pkcs7;
-- 
2.18.4