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From:   Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
To:     linux-integrity@vger.kernel.org
Cc:     Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
        Kylene Jo Hall <kjhall@us.ibm.com>,
        "Ferry Toth :" <ferry.toth@elsinga.info>,
        Peter Huewe <peterhuewe@gmx.de>,
        Jason Gunthorpe <jgg@ziepe.ca>, Arnd Bergmann <arnd@arndb.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Jerry Snitselaar <jsnitsel@redhat.com>,
        Sumit Garg <sumit.garg@linaro.org>,
        James Bottomley <James.Bottomley@HansenPartnership.com>,
        Alexey Klimov <aklimov@redhat.com>,
        Andrew Morton <akpm@osdl.org>,
        linux-kernel@vger.kernel.org (open list)
Subject: [PATCH] tpm_tis: Remove the HID IFX0102
Date:   Thu, 25 Jun 2020 02:00:33 +0300
Message-Id: <20200624230037.21192-1-jarkko.sakkinen@linux.intel.com>
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Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Acer C720 running Linux v5.3 reports this in klog:

tpm_tis: 1.2 TPM (device-id 0xB, rev-id 16)
tpm tpm0: tpm_try_transmit: send(): error -5
tpm tpm0: A TPM error (-5) occurred attempting to determine the timeouts
tpm_tis tpm_tis: Could not get TPM timeouts and durations
tpm_tis 00:08: 1.2 TPM (device-id 0xB, rev-id 16)
tpm tpm0: tpm_try_transmit: send(): error -5
tpm tpm0: A TPM error (-5) occurred attempting to determine the timeouts
tpm_tis 00:08: Could not get TPM timeouts and durations
ima: No TPM chip found, activating TPM-bypass!
tpm_inf_pnp 00:08: Found TPM with ID IFX0102

% git --no-pager grep IFX0102 drivers/char/tpm
drivers/char/tpm/tpm_infineon.c:	{"IFX0102", 0},
drivers/char/tpm/tpm_tis.c:	{"IFX0102", 0},		/* Infineon */

Obviously IFX0102 was added to the HID table for the TCG TIS driver by
mistake.

Fixes: 93e1b7d42e1e ("[PATCH] tpm: add HID module parameter")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=203877
Cc: Kylene Jo Hall <kjhall@us.ibm.com>
Reported-by: Ferry Toth: <ferry.toth@elsinga.info>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
 drivers/char/tpm/tpm2-space.c | 14 ++++++++++----
 drivers/char/tpm/tpm_tis.c    |  1 -
 include/linux/tpm.h           |  6 ++++--
 3 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/drivers/char/tpm/tpm2-space.c b/drivers/char/tpm/tpm2-space.c
index 982d341d8837..c9817930eb23 100644
--- a/drivers/char/tpm/tpm2-space.c
+++ b/drivers/char/tpm/tpm2-space.c
@@ -47,9 +47,13 @@ int tpm2_init_space(struct tpm_space *space)
 	space->session_buf = kzalloc(PAGE_SIZE, GFP_KERNEL);
 	if (space->session_buf == NULL) {
 		kfree(space->context_buf);
+		space->context_buf = NULL;
 		return -ENOMEM;
 	}
 
+	space->context_size = PAGE_SIZE;
+	space->session_size = PAGE_SIZE;
+
 	return 0;
 }
 
@@ -311,8 +315,10 @@ int tpm2_prepare_space(struct tpm_chip *chip, struct tpm_space *space, u8 *cmd,
 	       sizeof(space->context_tbl));
 	memcpy(&chip->work_space.session_tbl, &space->session_tbl,
 	       sizeof(space->session_tbl));
-	memcpy(chip->work_space.context_buf, space->context_buf, PAGE_SIZE);
-	memcpy(chip->work_space.session_buf, space->session_buf, PAGE_SIZE);
+	memcpy(chip->work_space.context_buf, space->context_buf,
+	       space->context_size);
+	memcpy(chip->work_space.session_buf, space->session_buf,
+	       space->session_size);
 
 	rc = tpm2_load_space(chip);
 	if (rc) {
@@ -492,7 +498,7 @@ static int tpm2_save_space(struct tpm_chip *chip)
 			continue;
 
 		rc = tpm2_save_context(chip, space->context_tbl[i],
-				       space->context_buf, PAGE_SIZE,
+				       space->context_buf, space->context_size,
 				       &offset);
 		if (rc == -ENOENT) {
 			space->context_tbl[i] = 0;
@@ -509,7 +515,7 @@ static int tpm2_save_space(struct tpm_chip *chip)
 			continue;
 
 		rc = tpm2_save_context(chip, space->session_tbl[i],
-				       space->session_buf, PAGE_SIZE,
+				       space->session_buf, space->session_size,
 				       &offset);
 
 		if (rc == -ENOENT) {
diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index e7df342a317d..c58ea10fc92f 100644
--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -238,7 +238,6 @@ static int tpm_tis_pnp_init(struct pnp_dev *pnp_dev,
 static struct pnp_device_id tpm_pnp_tbl[] = {
 	{"PNP0C31", 0},		/* TPM */
 	{"ATM1200", 0},		/* Atmel */
-	{"IFX0102", 0},		/* Infineon */
 	{"BCM0101", 0},		/* Broadcom */
 	{"BCM0102", 0},		/* Broadcom */
 	{"NSC1200", 0},		/* National */
diff --git a/include/linux/tpm.h b/include/linux/tpm.h
index 03e9b184411b..9ea39e8f7162 100644
--- a/include/linux/tpm.h
+++ b/include/linux/tpm.h
@@ -92,10 +92,12 @@ enum tpm_duration {
 #define TPM_PPI_VERSION_LEN		3
 
 struct tpm_space {
+	u8  *context_buf;
+	u8  *session_buf;
+	u32 context_size;
+	u32 session_size;
 	u32 context_tbl[3];
-	u8 *context_buf;
 	u32 session_tbl[3];
-	u8 *session_buf;
 };
 
 struct tpm_bios_log {
-- 
2.25.1