[v4,4/5] tpm: tpm2_key: Extend parser to TPM_LoadableKey

Commit Message

Jarkko Sakkinen May 22, 2024, 12:52 a.m. UTC

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 <[e-mail]>
---
v3:
* Fixup klog messages:
  https://lore.kernel.org/linux-integrity/[e-mail]/
---
 drivers/char/tpm/tpm2_key.c               | 17 ++++++++++++-----
 include/crypto/tpm2_key.h                 |  2 ++
 security/keys/trusted-keys/trusted_tpm2.c |  4 ++++
 3 files changed, 18 insertions(+), 5 deletions(-)

Patch

diff --git a/drivers/char/tpm/tpm2_key.c b/drivers/char/tpm/tpm2_key.c
index 7662b2cb85bf..b5c07288eff5 100644
--- a/drivers/char/tpm/tpm2_key.c
+++ b/drivers/char/tpm/tpm2_key.c
@@ -32,16 +32,23 @@  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_debug("TPMSealedData\n");
+		break;
+	case OID_TPMLoadableKey:
+		pr_debug("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);
+		pr_debug("Unknown OID \"%s\"\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 7e6eaec8b0bc..06a09c399334 100644
--- a/security/keys/trusted-keys/trusted_tpm2.c
+++ b/security/keys/trusted-keys/trusted_tpm2.c
@@ -303,6 +303,10 @@  static int tpm2_load_cmd(struct tpm_chip *chip,
 		payload->old_format = 1;
 	} else {
 		blob = key.blob;
+		if (key.oid != OID_TPMSealedData) {
+			tpm2_key_destroy(&key);
+			return -EINVAL;
+		}
 	}
 
 	if (!blob)