linux-kernel - [PATCH 4/9] security: keys: trusted: Store the handle of a loaded key

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Message-Id: <20210220013255.1083202-5-matthewgarrett@google.com>
Date:   Sat, 20 Feb 2021 01:32:50 +0000
From:   Matthew Garrett <matthewgarrett@...gle.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-integrity@...r.kernel.org, linux-pm@...r.kernel.org,
        keyrings@...r.kernel.org, zohar@...ux.ibm.com, jejb@...ux.ibm.com,
        jarkko@...nel.org, corbet@....net, rjw@...ysocki.net,
        Matthew Garrett <matthewgarrett@...gle.com>,
        Matthew Garrett <mjg59@...gle.com>
Subject: [PATCH 4/9] security: keys: trusted: Store the handle of a loaded key

Certain in-kernel operations using a trusted key (such as creation
certification) require knowledge of the handle it's loaded at. Keep
a copy of that in the payload.

Signed-off-by: Matthew Garrett <mjg59@...gle.com>
---
 include/keys/trusted-type.h               | 1 +
 security/keys/trusted-keys/trusted_tpm2.c | 6 ++++--
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/include/keys/trusted-type.h b/include/keys/trusted-type.h
index 020e01a99ea4..154d8a1769c3 100644
--- a/include/keys/trusted-type.h
+++ b/include/keys/trusted-type.h
@@ -21,6 +21,7 @@
 
 struct trusted_key_payload {
 	struct rcu_head rcu;
+	unsigned int blob_handle;
 	unsigned int key_len;
 	unsigned int blob_len;
 	unsigned int creation_len;
diff --git a/security/keys/trusted-keys/trusted_tpm2.c b/security/keys/trusted-keys/trusted_tpm2.c
index 6357a51a24e9..a3673fffd834 100644
--- a/security/keys/trusted-keys/trusted_tpm2.c
+++ b/security/keys/trusted-keys/trusted_tpm2.c
@@ -272,11 +272,13 @@ static int tpm2_load_cmd(struct tpm_chip *chip,
 	}
 
 	rc = tpm_send(chip, buf.data, tpm_buf_length(&buf));
-	if (!rc)
+	if (!rc) {
 		*blob_handle = be32_to_cpup(
 			(__be32 *) &buf.data[TPM_HEADER_SIZE]);
-	else
+		payload->blob_handle = *blob_handle;
+	} else {
 		goto out;
+	}
 
 	rc = tpm2_unpack_blob(payload);
 out:
-- 
2.30.0.617.g56c4b15f3c-goog