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

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Message-Id: <20210812021855.3083178-9-eric.snowberg@oracle.com>
Date:   Wed, 11 Aug 2021 22:18:49 -0400
From:   Eric Snowberg <eric.snowberg@...cle.com>
To:     keyrings@...r.kernel.org, linux-integrity@...r.kernel.org,
        zohar@...ux.ibm.com, dhowells@...hat.com, dwmw2@...radead.org,
        herbert@...dor.apana.org.au, davem@...emloft.net,
        jarkko@...nel.org, jmorris@...ei.org, serge@...lyn.com
Cc:     eric.snowberg@...cle.com, keescook@...omium.org,
        gregkh@...uxfoundation.org, torvalds@...ux-foundation.org,
        scott.branden@...adcom.com, weiyongjun1@...wei.com,
        nayna@...ux.ibm.com, ebiggers@...gle.com, ardb@...nel.org,
        nramas@...ux.microsoft.com, lszubowi@...hat.com,
        linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        James.Bottomley@...senPartnership.com, pjones@...hat.com,
        glin@...e.com, konrad.wilk@...cle.com
Subject: [PATCH v3 08/14] KEYS: add a reference to mok keyring

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@...cle.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