linux-kernel - [PATCH] KEYS: trusted_tpm2: Only check options->keyhandle for ASN.1

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Date: Sat, 25 May 2024 15:36:33 +0300
From: Jarkko Sakkinen <jarkko@...nel.org>
To: linux-integrity@...r.kernel.org
Cc: keyrings@...r.kernel.org,
	James.Bottomley@...senPartnership.com,
	Jarkko Sakkinen <jarkko@...nel.org>,
	stable@...r.kernel.org,
	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,
	linux-kernel@...r.kernel.org
Subject: [PATCH] KEYS: trusted_tpm2: Only check options->keyhandle for ASN.1

tpm2_load_cmd incorrectly checks options->keyhandle also for the legacy
format, as also implied by the inline comment. Check options->keyhandle
when ASN.1 is loaded.

Cc: James Bottomey <James.Bottomley@...senPartnership.com>
Cc: stable@...r.kernel.org # v5.13+
Fixes: f2219745250f ("security: keys: trusted: use ASN.1 TPM2 key format for the blobs")
Signed-off-by: Jarkko Sakkinen <jarkko@...nel.org>
---
 security/keys/trusted-keys/trusted_tpm2.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/security/keys/trusted-keys/trusted_tpm2.c b/security/keys/trusted-keys/trusted_tpm2.c
index 8b7dd73d94c1..4f8207bf52a7 100644
--- a/security/keys/trusted-keys/trusted_tpm2.c
+++ b/security/keys/trusted-keys/trusted_tpm2.c
@@ -400,12 +400,11 @@ static int tpm2_load_cmd(struct tpm_chip *chip,
 		/* old form */
 		blob = payload->blob;
 		payload->old_format = 1;
+	} else {
+		if (!options->keyhandle)
+			return -EINVAL;
 	}
 
-	/* new format carries keyhandle but old format doesn't */
-	if (!options->keyhandle)
-		return -EINVAL;
-
 	/* must be big enough for at least the two be16 size counts */
 	if (payload->blob_len < 4)
 		return -EINVAL;
-- 
2.45.1