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From: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
To: linux-integrity@vger.kernel.org
Cc: linux-security-module@vger.kernel.org,
	James Bottomley <James.Bottomley@HansenPartnership.com>,
	Tomas Winkler <tomas.winkler@intel.com>,
	Tadeusz Struk <tadeusz.struk@intel.com>,
	Stefan Berger <stefanb@linux.vnet.ibm.com>,
	Nayna Jain <nayna@linux.ibm.com>,
	Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
	Peter Huewe <peterhuewe@gmx.de>, Jason Gunthorpe <jgg@ziepe.ca>,
	Arnd Bergmann <arnd@arndb.de>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	linux-kernel@vger.kernel.org (open list)
Subject: [PATCH v6 13/17] tpm: use tpm_try_get_ops() in tpm-sysfs.c.
Date: Tue, 13 Nov 2018 14:26:02 +0200	[thread overview]
Message-ID: <20181113122609.21643-14-jarkko.sakkinen@linux.intel.com> (raw)
In-Reply-To: <20181113122609.21643-1-jarkko.sakkinen@linux.intel.com>

Use tpm_try_get_ops() in tpm-sysfs.c so that we can consider moving
other decorations (locking, localities, power management for example)
inside it. This direction can be of course taken only after other call
sites for tpm_transmit() have been treated in the same way.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
---
 drivers/char/tpm/tpm-sysfs.c | 123 ++++++++++++++++++++++-------------
 1 file changed, 78 insertions(+), 45 deletions(-)

diff --git a/drivers/char/tpm/tpm-sysfs.c b/drivers/char/tpm/tpm-sysfs.c
index 03e704f99ed6..3733491671ca 100644
--- a/drivers/char/tpm/tpm-sysfs.c
+++ b/drivers/char/tpm/tpm-sysfs.c
@@ -39,7 +39,6 @@ static ssize_t pubek_show(struct device *dev, struct device_attribute *attr,
 {
 	struct tpm_buf tpm_buf;
 	struct tpm_readpubek_out *out;
-	ssize_t rc;
 	int i;
 	char *str = buf;
 	struct tpm_chip *chip = to_tpm_chip(dev);
@@ -47,17 +46,17 @@ static ssize_t pubek_show(struct device *dev, struct device_attribute *attr,
 
 	memset(&anti_replay, 0, sizeof(anti_replay));
 
-	if (tpm_buf_init(&tpm_buf, TPM_TAG_RQU_COMMAND, TPM_ORD_READPUBEK))
+	if (tpm_try_get_ops(chip))
 		return 0;
 
+	if (tpm_buf_init(&tpm_buf, TPM_TAG_RQU_COMMAND, TPM_ORD_READPUBEK))
+		goto out_ops;
+
 	tpm_buf_append(&tpm_buf, anti_replay, sizeof(anti_replay));
 
-	rc = tpm_transmit_cmd(chip, &tpm_buf, READ_PUBEK_RESULT_MIN_BODY_SIZE,
-			      0, "attempting to read the PUBEK");
-	if (rc) {
-		tpm_buf_destroy(&tpm_buf);
-		return 0;
-	}
+	if (tpm_transmit_cmd(chip, &tpm_buf, READ_PUBEK_RESULT_MIN_BODY_SIZE,
+			      0, "attempting to read the PUBEK"))
+		goto out_buf;
 
 	out = (struct tpm_readpubek_out *)&tpm_buf.data[10];
 	str +=
@@ -88,9 +87,11 @@ static ssize_t pubek_show(struct device *dev, struct device_attribute *attr,
 			str += sprintf(str, "\n");
 	}
 
-	rc = str - buf;
+out_buf:
 	tpm_buf_destroy(&tpm_buf);
-	return rc;
+out_ops:
+	tpm_put_ops(chip);
+	return str - buf;
 }
 static DEVICE_ATTR_RO(pubek);
 
@@ -103,10 +104,15 @@ static ssize_t pcrs_show(struct device *dev, struct device_attribute *attr,
 	char *str = buf;
 	struct tpm_chip *chip = to_tpm_chip(dev);
 
+	if (tpm_try_get_ops(chip))
+		return 0;
+
 	if (tpm1_getcap(chip, TPM_CAP_PROP_PCR, &cap,
 			"attempting to determine the number of PCRS",
-			sizeof(cap.num_pcrs)))
+			sizeof(cap.num_pcrs))) {
+		tpm_put_ops(chip);
 		return 0;
+	}
 
 	num_pcrs = be32_to_cpu(cap.num_pcrs);
 	for (i = 0; i < num_pcrs; i++) {
@@ -119,6 +125,7 @@ static ssize_t pcrs_show(struct device *dev, struct device_attribute *attr,
 			str += sprintf(str, "%02X ", digest[j]);
 		str += sprintf(str, "\n");
 	}
+	tpm_put_ops(chip);
 	return str - buf;
 }
 static DEVICE_ATTR_RO(pcrs);
@@ -126,16 +133,21 @@ static DEVICE_ATTR_RO(pcrs);
 static ssize_t enabled_show(struct device *dev, struct device_attribute *attr,
 		     char *buf)
 {
+	struct tpm_chip *chip = to_tpm_chip(dev);
+	ssize_t rc = 0;
 	cap_t cap;
-	ssize_t rc;
 
-	rc = tpm1_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_PERM, &cap,
-			 "attempting to determine the permanent enabled state",
-			 sizeof(cap.perm_flags));
-	if (rc)
+	if (tpm_try_get_ops(chip))
 		return 0;
 
+	if (tpm1_getcap(chip, TPM_CAP_FLAG_PERM, &cap,
+			"attempting to determine the permanent enabled state",
+			sizeof(cap.perm_flags)))
+		goto out_ops;
+
 	rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);
+out_ops:
+	tpm_put_ops(chip);
 	return rc;
 }
 static DEVICE_ATTR_RO(enabled);
@@ -143,16 +155,21 @@ static DEVICE_ATTR_RO(enabled);
 static ssize_t active_show(struct device *dev, struct device_attribute *attr,
 		    char *buf)
 {
+	struct tpm_chip *chip = to_tpm_chip(dev);
+	ssize_t rc = 0;
 	cap_t cap;
-	ssize_t rc;
 
-	rc = tpm1_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_PERM, &cap,
-			 "attempting to determine the permanent active state",
-			 sizeof(cap.perm_flags));
-	if (rc)
+	if (tpm_try_get_ops(chip))
 		return 0;
 
+	if (tpm1_getcap(chip, TPM_CAP_FLAG_PERM, &cap,
+			"attempting to determine the permanent active state",
+			sizeof(cap.perm_flags)))
+		goto out_ops;
+
 	rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);
+out_ops:
+	tpm_put_ops(chip);
 	return rc;
 }
 static DEVICE_ATTR_RO(active);
@@ -160,16 +177,21 @@ static DEVICE_ATTR_RO(active);
 static ssize_t owned_show(struct device *dev, struct device_attribute *attr,
 			  char *buf)
 {
+	struct tpm_chip *chip = to_tpm_chip(dev);
+	ssize_t rc = 0;
 	cap_t cap;
-	ssize_t rc;
 
-	rc = tpm1_getcap(to_tpm_chip(dev), TPM_CAP_PROP_OWNER, &cap,
-			 "attempting to determine the owner state",
-			 sizeof(cap.owned));
-	if (rc)
+	if (tpm_try_get_ops(chip))
 		return 0;
 
+	if (tpm1_getcap(to_tpm_chip(dev), TPM_CAP_PROP_OWNER, &cap,
+			"attempting to determine the owner state",
+			sizeof(cap.owned)))
+		goto out_ops;
+
 	rc = sprintf(buf, "%d\n", cap.owned);
+out_ops:
+	tpm_put_ops(chip);
 	return rc;
 }
 static DEVICE_ATTR_RO(owned);
@@ -177,16 +199,21 @@ static DEVICE_ATTR_RO(owned);
 static ssize_t temp_deactivated_show(struct device *dev,
 				     struct device_attribute *attr, char *buf)
 {
+	struct tpm_chip *chip = to_tpm_chip(dev);
+	ssize_t rc = 0;
 	cap_t cap;
-	ssize_t rc;
 
-	rc = tpm1_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_VOL, &cap,
-			 "attempting to determine the temporary state",
-			 sizeof(cap.stclear_flags));
-	if (rc)
+	if (tpm_try_get_ops(chip))
 		return 0;
 
+	if (tpm1_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_VOL, &cap,
+			"attempting to determine the temporary state",
+			sizeof(cap.stclear_flags)))
+		goto out_ops;
+
 	rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
+out_ops:
+	tpm_put_ops(chip);
 	return rc;
 }
 static DEVICE_ATTR_RO(temp_deactivated);
@@ -195,15 +222,18 @@ static ssize_t caps_show(struct device *dev, struct device_attribute *attr,
 			 char *buf)
 {
 	struct tpm_chip *chip = to_tpm_chip(dev);
-	cap_t cap;
-	ssize_t rc;
+	ssize_t rc = 0;
 	char *str = buf;
+	cap_t cap;
 
-	rc = tpm1_getcap(chip, TPM_CAP_PROP_MANUFACTURER, &cap,
-			 "attempting to determine the manufacturer",
-			 sizeof(cap.manufacturer_id));
-	if (rc)
+	if (tpm_try_get_ops(chip))
 		return 0;
+
+	if (tpm1_getcap(chip, TPM_CAP_PROP_MANUFACTURER, &cap,
+			"attempting to determine the manufacturer",
+			sizeof(cap.manufacturer_id)))
+		goto out_ops;
+
 	str += sprintf(str, "Manufacturer: 0x%x\n",
 		       be32_to_cpu(cap.manufacturer_id));
 
@@ -220,11 +250,10 @@ static ssize_t caps_show(struct device *dev, struct device_attribute *attr,
 			       cap.tpm_version_1_2.revMinor);
 	} else {
 		/* Otherwise just use TPM_STRUCT_VER */
-		rc = tpm1_getcap(chip, TPM_CAP_VERSION_1_1, &cap,
-				 "attempting to determine the 1.1 version",
-				 sizeof(cap.tpm_version));
-		if (rc)
-			return 0;
+		if (tpm1_getcap(chip, TPM_CAP_VERSION_1_1, &cap,
+				"attempting to determine the 1.1 version",
+				sizeof(cap.tpm_version)))
+			goto out_ops;
 		str += sprintf(str,
 			       "TCG version: %d.%d\nFirmware version: %d.%d\n",
 			       cap.tpm_version.Major,
@@ -232,8 +261,10 @@ static ssize_t caps_show(struct device *dev, struct device_attribute *attr,
 			       cap.tpm_version.revMajor,
 			       cap.tpm_version.revMinor);
 	}
-
-	return str - buf;
+	rc = str - buf;
+out_ops:
+	tpm_put_ops(chip);
+	return rc;
 }
 static DEVICE_ATTR_RO(caps);
 
@@ -241,10 +272,12 @@ static ssize_t cancel_store(struct device *dev, struct device_attribute *attr,
 			    const char *buf, size_t count)
 {
 	struct tpm_chip *chip = to_tpm_chip(dev);
-	if (chip == NULL)
+
+	if (tpm_try_get_ops(chip))
 		return 0;
 
 	chip->ops->cancel(chip);
+	tpm_put_ops(chip);
 	return count;
 }
 static DEVICE_ATTR_WO(cancel);
-- 
2.19.1


  parent reply	other threads:[~2018-11-13 12:28 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-13 12:25 [PATCH v6 00/17] Removed nested TPM operations Jarkko Sakkinen
2018-11-13 12:25 ` [PATCH v6 01/17] tpm: use tpm_buf in tpm_transmit_cmd() as the IO parameter Jarkko Sakkinen
2018-11-13 12:25 ` [PATCH v6 02/17] tpm: fix invalid return value in pubek_show() Jarkko Sakkinen
2018-11-13 12:25 ` [PATCH v6 03/17] tpm: return 0 from pcrs_show() when tpm1_pcr_read() fails Jarkko Sakkinen
2018-11-13 12:25 ` [PATCH v6 04/17] tpm: call tpm2_flush_space() on error in tpm_try_transmit() Jarkko Sakkinen
2018-11-13 12:25 ` [PATCH v6 05/17] tpm: print tpm2_commit_space() error inside tpm2_commit_space() Jarkko Sakkinen
2018-11-13 12:25 ` [PATCH v6 06/17] tpm: clean up tpm_try_transmit() error handling flow Jarkko Sakkinen
2018-11-13 12:25 ` [PATCH v6 07/17] tpm: declare struct tpm_header Jarkko Sakkinen
2018-11-13 12:25 ` [PATCH v6 08/17] tpm: access command header through struct in tpm_try_transmit() Jarkko Sakkinen
2018-11-13 12:25 ` [PATCH v6 09/17] tpm: move tpm_validate_commmand() to tpm2-space.c Jarkko Sakkinen
2018-11-13 12:25 ` [PATCH v6 10/17] tpm: encapsulate tpm_dev_transmit() Jarkko Sakkinen
2018-11-13 12:26 ` [PATCH v6 11/17] tpm: move TPM space code out of tpm_transmit() Jarkko Sakkinen
2018-11-13 12:26 ` [PATCH v6 12/17] tpm: remove @space from tpm_transmit() Jarkko Sakkinen
2018-11-13 12:26 ` Jarkko Sakkinen [this message]
2018-11-13 12:26 ` [PATCH v6 14/17] tpm: remove TPM_TRANSMIT_UNLOCKED flag Jarkko Sakkinen
2018-11-13 12:26 ` [PATCH v6 15/17] tpm: introduce tpm_chip_start() and tpm_chip_stop() Jarkko Sakkinen
2018-11-13 12:26 ` [PATCH v6 16/17] tpm: take TPM chip power gating out of tpm_transmit() Jarkko Sakkinen
2018-11-13 12:26 ` [PATCH v6 17/17] tpm: remove @flags from tpm_transmit() Jarkko Sakkinen
2018-11-13 12:30 ` [PATCH v6 00/17] Removed nested TPM operations Winkler, Tomas
2018-11-13 16:55   ` Jarkko Sakkinen

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