linux-kernel - [PATCH] char: tpm: ftpm_tee: use kernel login identifier

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Message-Id: <20230505184318.1355446-1-etienne.carriere@linaro.org>
Date:   Fri,  5 May 2023 20:43:18 +0200
From:   Etienne Carriere <etienne.carriere@...aro.org>
To:     linux-kernel@...r.kernel.org
Cc:     Peter Huewe <peterhuewe@....de>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Jason Gunthorpe <jgg@...pe.ca>,
        linux-integrity@...r.kernel.org,
        Etienne Carriere <etienne.carriere@...aro.org>
Subject: [PATCH] char: tpm: ftpm_tee: use kernel login identifier

Changes fTPM TEE driver to open the TEE session with REE kernel login
identifier rather than public login. This is needed in case fTPM service
it denied to user land application and restricted to kernel operating
system services only.

Signed-off-by: Etienne Carriere <etienne.carriere@...aro.org>
---
 drivers/char/tpm/tpm_ftpm_tee.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/char/tpm/tpm_ftpm_tee.c b/drivers/char/tpm/tpm_ftpm_tee.c
index 528f35b14fb6..6d32e260af43 100644
--- a/drivers/char/tpm/tpm_ftpm_tee.c
+++ b/drivers/char/tpm/tpm_ftpm_tee.c
@@ -241,7 +241,7 @@ static int ftpm_tee_probe(struct device *dev)
 	/* Open a session with fTPM TA */
 	memset(&sess_arg, 0, sizeof(sess_arg));
 	export_uuid(sess_arg.uuid, &ftpm_ta_uuid);
-	sess_arg.clnt_login = TEE_IOCTL_LOGIN_PUBLIC;
+	sess_arg.clnt_login = TEE_IOCTL_LOGIN_REE_KERNEL;
 	sess_arg.num_params = 0;
 
 	rc = tee_client_open_session(pvt_data->ctx, &sess_arg, NULL);
-- 
2.25.1