linux-kernel - [PATCH RFC v2 06/12] integrity: accessor function to get trust

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Date:   Mon, 26 Jul 2021 13:13:13 -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 RFC v2 06/12] integrity: accessor function to get trust_moklist

Add an accessor function to see if the mok list should be trusted.

Signed-off-by: Eric Snowberg <eric.snowberg@...cle.com>
---
v1: Initial version
v2: Added trust_moklist function
---
 security/integrity/integrity.h                  |  5 +++++
 security/integrity/platform_certs/mok_keyring.c | 16 ++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/security/integrity/integrity.h b/security/integrity/integrity.h
index 60d5c7ba05b2..1fcefceb0da1 100644
--- a/security/integrity/integrity.h
+++ b/security/integrity/integrity.h
@@ -279,6 +279,7 @@ integrity_audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type)
 void __init add_to_platform_keyring(const char *source, const void *data,
 				    size_t len);
 void __init add_to_mok_keyring(const char *source, const void *data, size_t len);
+bool __init trust_moklist(void);
 #else
 static inline void __init add_to_platform_keyring(const char *source,
 						  const void *data, size_t len)
@@ -287,4 +288,8 @@ static inline void __init add_to_platform_keyring(const char *source,
 void __init add_to_mok_keyring(const char *source, const void *data, size_t len)
 {
 }
+static inline bool __init trust_moklist(void)
+{
+	return false;
+}
 #endif
diff --git a/security/integrity/platform_certs/mok_keyring.c b/security/integrity/platform_certs/mok_keyring.c
index f260edac0863..c7820d9136f3 100644
--- a/security/integrity/platform_certs/mok_keyring.c
+++ b/security/integrity/platform_certs/mok_keyring.c
@@ -8,6 +8,8 @@
 #include <linux/efi.h>
 #include "../integrity.h"
 
+bool trust_mok;
+
 static __init int mok_keyring_init(void)
 {
 	int rc;
@@ -67,3 +69,17 @@ static __init bool uefi_check_trust_mok_keys(void)
 	 */
 	return (status == EFI_SUCCESS && (!(attr & EFI_VARIABLE_NON_VOLATILE)));
 }
+
+bool __init trust_moklist(void)
+{
+	static bool initialized;
+
+	if (!initialized) {
+		initialized = true;
+
+		if (uefi_check_trust_mok_keys())
+			trust_mok = true;
+	}
+
+	return trust_mok;
+}
-- 
2.18.4