linux-kernel - [PATCH 5/6] tpm: tpm2_key: Extend parser to TPM

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Message-ID: <20240520184727.22038-6-jarkko@kernel.org>
Date: Mon, 20 May 2024 21:47:12 +0300
From: Jarkko Sakkinen <jarkko@...nel.org>
To: Herbert Xu <herbert@...dor.apana.org.au>
Cc: linux-integrity@...r.kernel.org,
	keyrings@...r.kernel.org,
	Andreas.Fuchs@...ineon.com,
	James Prestwood <prestwoj@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Jarkko Sakkinen <jarkko@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	linux-crypto@...r.kernel.org (open list:CRYPTO API),
	linux-kernel@...r.kernel.org (open list),
	Peter Huewe <peterhuewe@....de>,
	Jason Gunthorpe <jgg@...pe.ca>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Mimi Zohar <zohar@...ux.ibm.com>,
	David Howells <dhowells@...hat.com>,
	Paul Moore <paul@...l-moore.com>,
	James Morris <jmorris@...ei.org>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	linux-security-module@...r.kernel.org (open list:SECURITY SUBSYSTEM)
Subject: [PATCH 5/6] tpm: tpm2_key: Extend parser to TPM_LoadableKey

Extend parser to TPM_LoadableKey. Add field for oid to struct tpm2_key
so that callers can differentiate different key types.

Signed-off-by: Jarkko Sakkinen <jarkko@...nel.org>
---
 drivers/char/tpm/tpm2_key.c               | 14 +++++++++++---
 include/crypto/tpm2_key.h                 |  2 ++
 security/keys/trusted-keys/trusted_tpm2.c |  5 +++++
 3 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/drivers/char/tpm/tpm2_key.c b/drivers/char/tpm/tpm2_key.c
index 0112362e432e..59797dc232f1 100644
--- a/drivers/char/tpm/tpm2_key.c
+++ b/drivers/char/tpm/tpm2_key.c
@@ -32,16 +32,24 @@ int tpm2_key_type(void *context, size_t hdrlen,
 		  const void *value, size_t vlen)
 {
 	enum OID oid = look_up_OID(value, vlen);
-
-	if (oid != OID_TPMSealedData) {
+	struct tpm2_key *key = context;
+
+	switch (oid) {
+	case OID_TPMSealedData:
+		pr_info("TPMSealedData\n");
+		break;
+	case OID_TPMLoadableKey:
+		pr_info("TPMLodableKey\n");
+		break;
+	default:
 		char buffer[50];
-
 		sprint_oid(value, vlen, buffer, sizeof(buffer));
 		pr_debug("OID is \"%s\" which is not TPMSealedData\n",
 			 buffer);
 		return -EINVAL;
 	}
 
+	key->oid = oid;
 	return 0;
 }
 
diff --git a/include/crypto/tpm2_key.h b/include/crypto/tpm2_key.h
index acf41b2e0c92..2d2434233000 100644
--- a/include/crypto/tpm2_key.h
+++ b/include/crypto/tpm2_key.h
@@ -2,12 +2,14 @@
 #ifndef __LINUX_TPM2_KEY_H__
 #define __LINUX_TPM2_KEY_H__
 
+#include <linux/oid_registry.h>
 #include <linux/slab.h>
 
 /*
  * TPM2 ASN.1 key
  */
 struct tpm2_key {
+	enum OID oid;
 	u32 parent;
 	const u8 *blob;
 	u32 blob_len;
diff --git a/security/keys/trusted-keys/trusted_tpm2.c b/security/keys/trusted-keys/trusted_tpm2.c
index 49ee2a57797a..842a8e2701e4 100644
--- a/security/keys/trusted-keys/trusted_tpm2.c
+++ b/security/keys/trusted-keys/trusted_tpm2.c
@@ -304,6 +304,11 @@ static int tpm2_load_cmd(struct tpm_chip *chip,
 		blob = payload->blob;
 		payload->old_format = 1;
 	} else {
+		if (key.oid != OID_TPMSealedData) {
+			tpm2_key_destroy(&key);
+			return -EINVAL;
+		}
+
 		blob = kmalloc(key.priv_len + key.pub_len + 4, GFP_KERNEL);
 		if (blob) {
 			options->keyhandle = key.parent;
-- 
2.45.1