Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security

Pull security subsystem updates from James Morris:
 "Highlights:

  IMA:
   - provide ">" and "<" operators for fowner/uid/euid rules

  KEYS:
   - add a system blacklist keyring

   - add KEYCTL_RESTRICT_KEYRING, exposes keyring link restriction
     functionality to userland via keyctl()

  LSM:
   - harden LSM API with __ro_after_init

   - add prlmit security hook, implement for SELinux

   - revive security_task_alloc hook

  TPM:
   - implement contextual TPM command 'spaces'"

* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security: (98 commits)
  tpm: Fix reference count to main device
  tpm_tis: convert to using locality callbacks
  tpm: fix handling of the TPM 2.0 event logs
  tpm_crb: remove a cruft constant
  keys: select CONFIG_CRYPTO when selecting DH / KDF
  apparmor: Make path_max parameter readonly
  apparmor: fix parameters so that the permission test is bypassed at boot
  apparmor: fix invalid reference to index variable of iterator line 836
  apparmor: use SHASH_DESC_ON_STACK
  security/apparmor/lsm.c: set debug messages
  apparmor: fix boolreturn.cocci warnings
  Smack: Use GFP_KERNEL for smk_netlbl_mls().
  smack: fix double free in smack_parse_opts_str()
  KEYS: add SP800-56A KDF support for DH
  KEYS: Keyring asymmetric key restrict method with chaining
  KEYS: Restrict asymmetric key linkage using a specific keychain
  KEYS: Add a lookup_restriction function for the asymmetric key type
  KEYS: Add KEYCTL_RESTRICT_KEYRING
  KEYS: Consistent ordering for __key_link_begin and restrict check
  KEYS: Add an optional lookup_restriction hook to key_type
  ...

22 files changed, 1549 insertions, 433 deletions

diff --git a/drivers/char/tpm/Kconfig b/drivers/char/tpm/Kconfig
index af985cca413c..a30352202f1f 100644
--- a/drivers/char/tpm/Kconfig
+++ b/drivers/char/tpm/Kconfig
@@ -6,6 +6,7 @@ menuconfig TCG_TPM
 	tristate "TPM Hardware Support"
 	depends on HAS_IOMEM
 	select SECURITYFS
+	select CRYPTO
 	select CRYPTO_HASH_INFO
 	---help---
 	  If you have a TPM security chip in your system, which
@@ -135,7 +136,7 @@ config TCG_XEN
 
 config TCG_CRB
 	tristate "TPM 2.0 CRB Interface"
-	depends on X86 && ACPI
+	depends on ACPI
 	---help---
 	  If you have a TPM security chip that is compliant with the
 	  TCG CRB 2.0 TPM specification say Yes and it will be accessible
diff --git a/drivers/char/tpm/Makefile b/drivers/char/tpm/Makefile
index 3d386a8c579f..23681f01f95a 100644
--- a/drivers/char/tpm/Makefile
+++ b/drivers/char/tpm/Makefile
@@ -3,7 +3,8 @@
 #
 obj-$(CONFIG_TCG_TPM) += tpm.o
 tpm-y := tpm-interface.o tpm-dev.o tpm-sysfs.o tpm-chip.o tpm2-cmd.o \
-		tpm1_eventlog.o tpm2_eventlog.o
+	 tpm-dev-common.o tpmrm-dev.o tpm1_eventlog.o tpm2_eventlog.o \
+         tpm2-space.o
 tpm-$(CONFIG_ACPI) += tpm_ppi.o tpm_acpi.o
 tpm-$(CONFIG_OF) += tpm_of.o
 obj-$(CONFIG_TCG_TIS_CORE) += tpm_tis_core.o
diff --git a/drivers/char/tpm/st33zp24/i2c.c b/drivers/char/tpm/st33zp24/i2c.c
index 028a9cd76b63..1b10e38f214e 100644
--- a/drivers/char/tpm/st33zp24/i2c.c
+++ b/drivers/char/tpm/st33zp24/i2c.c
@@ -111,6 +111,13 @@ static const struct st33zp24_phy_ops i2c_phy_ops = {
 	.recv = st33zp24_i2c_recv,
 };
 
+static const struct acpi_gpio_params lpcpd_gpios = { 1, 0, false };
+
+static const struct acpi_gpio_mapping acpi_st33zp24_gpios[] = {
+	{ "lpcpd-gpios", &lpcpd_gpios, 1 },
+	{},
+};
+
 static int st33zp24_i2c_acpi_request_resources(struct i2c_client *client)
 {
 	struct tpm_chip *chip = i2c_get_clientdata(client);
@@ -118,10 +125,14 @@ static int st33zp24_i2c_acpi_request_resources(struct i2c_client *client)
 	struct st33zp24_i2c_phy *phy = tpm_dev->phy_id;
 	struct gpio_desc *gpiod_lpcpd;
 	struct device *dev = &client->dev;
+	int ret;
+
+	ret = acpi_dev_add_driver_gpios(ACPI_COMPANION(dev), acpi_st33zp24_gpios);
+	if (ret)
+		return ret;
 
 	/* Get LPCPD GPIO from ACPI */
-	gpiod_lpcpd = devm_gpiod_get_index(dev, "TPM IO LPCPD", 1,
-					   GPIOD_OUT_HIGH);
+	gpiod_lpcpd = devm_gpiod_get(dev, "lpcpd", GPIOD_OUT_HIGH);
 	if (IS_ERR(gpiod_lpcpd)) {
 		dev_err(&client->dev,
 			"Failed to retrieve lpcpd-gpios from acpi.\n");
@@ -268,8 +279,14 @@ static int st33zp24_i2c_probe(struct i2c_client *client,
 static int st33zp24_i2c_remove(struct i2c_client *client)
 {
 	struct tpm_chip *chip = i2c_get_clientdata(client);
+	int ret;
 
-	return st33zp24_remove(chip);
+	ret = st33zp24_remove(chip);
+	if (ret)
+		return ret;
+
+	acpi_dev_remove_driver_gpios(ACPI_COMPANION(&client->dev));
+	return 0;
 }
 
 static const struct i2c_device_id st33zp24_i2c_id[] = {
diff --git a/drivers/char/tpm/st33zp24/spi.c b/drivers/char/tpm/st33zp24/spi.c
index 9f5a0117098c..c69d15198f84 100644
--- a/drivers/char/tpm/st33zp24/spi.c
+++ b/drivers/char/tpm/st33zp24/spi.c
@@ -230,6 +230,13 @@ static const struct st33zp24_phy_ops spi_phy_ops = {
 	.recv = st33zp24_spi_recv,
 };
 
+static const struct acpi_gpio_params lpcpd_gpios = { 1, 0, false };
+
+static const struct acpi_gpio_mapping acpi_st33zp24_gpios[] = {
+	{ "lpcpd-gpios", &lpcpd_gpios, 1 },
+	{},
+};
+
 static int st33zp24_spi_acpi_request_resources(struct spi_device *spi_dev)
 {
 	struct tpm_chip *chip = spi_get_drvdata(spi_dev);
@@ -237,10 +244,14 @@ static int st33zp24_spi_acpi_request_resources(struct spi_device *spi_dev)
 	struct st33zp24_spi_phy *phy = tpm_dev->phy_id;
 	struct gpio_desc *gpiod_lpcpd;
 	struct device *dev = &spi_dev->dev;
+	int ret;
+
+	ret = acpi_dev_add_driver_gpios(ACPI_COMPANION(dev), acpi_st33zp24_gpios);
+	if (ret)
+		return ret;
 
 	/* Get LPCPD GPIO from ACPI */
-	gpiod_lpcpd = devm_gpiod_get_index(dev, "TPM IO LPCPD", 1,
-					   GPIOD_OUT_HIGH);
+	gpiod_lpcpd = devm_gpiod_get(dev, "lpcpd", GPIOD_OUT_HIGH);
 	if (IS_ERR(gpiod_lpcpd)) {
 		dev_err(dev, "Failed to retrieve lpcpd-gpios from acpi.\n");
 		phy->io_lpcpd = -1;
@@ -385,8 +396,14 @@ static int st33zp24_spi_probe(struct spi_device *dev)
 static int st33zp24_spi_remove(struct spi_device *dev)
 {
 	struct tpm_chip *chip = spi_get_drvdata(dev);
+	int ret;
 
-	return st33zp24_remove(chip);
+	ret = st33zp24_remove(chip);
+	if (ret)
+		return ret;
+
+	acpi_dev_remove_driver_gpios(ACPI_COMPANION(&dev->dev));
+	return 0;
 }
 
 static const struct spi_device_id st33zp24_spi_id[] = {
diff --git a/drivers/char/tpm/st33zp24/st33zp24.c b/drivers/char/tpm/st33zp24/st33zp24.c
index e8e0f7c02686..4d1dc8b46877 100644
--- a/drivers/char/tpm/st33zp24/st33zp24.c
+++ b/drivers/char/tpm/st33zp24/st33zp24.c
@@ -117,9 +117,9 @@ static u8 st33zp24_status(struct tpm_chip *chip)
 /*
  * check_locality if the locality is active
  * @param: chip, the tpm chip description
- * @return: the active locality or -EACCESS.
+ * @return: true if LOCALITY0 is active, otherwise false
  */
-static int check_locality(struct tpm_chip *chip)
+static bool check_locality(struct tpm_chip *chip)
 {
 	struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
 	u8 data;
@@ -129,9 +129,9 @@ static int check_locality(struct tpm_chip *chip)
 	if (status && (data &
 		(TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
 		(TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID))
-		return tpm_dev->locality;
+		return true;
 
-	return -EACCES;
+	return false;
 } /* check_locality() */
 
 /*
@@ -146,7 +146,7 @@ static int request_locality(struct tpm_chip *chip)
 	long ret;
 	u8 data;
 
-	if (check_locality(chip) == tpm_dev->locality)
+	if (check_locality(chip))
 		return tpm_dev->locality;
 
 	data = TPM_ACCESS_REQUEST_USE;
@@ -158,7 +158,7 @@ static int request_locality(struct tpm_chip *chip)
 
 	/* Request locality is usually effective after the request */
 	do {
-		if (check_locality(chip) >= 0)
+		if (check_locality(chip))
 			return tpm_dev->locality;
 		msleep(TPM_TIMEOUT);
 	} while (time_before(jiffies, stop));
diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index c406343848da..9dec9f551b83 100644
--- a/drivers/char/tpm/tpm-chip.c
+++ b/drivers/char/tpm/tpm-chip.c
@@ -33,6 +33,7 @@ DEFINE_IDR(dev_nums_idr);
 static DEFINE_MUTEX(idr_lock);
 
 struct class *tpm_class;
+struct class *tpmrm_class;
 dev_t tpm_devt;
 
 /**
@@ -128,9 +129,19 @@ static void tpm_dev_release(struct device *dev)
 	mutex_unlock(&idr_lock);
 
 	kfree(chip->log.bios_event_log);
+	kfree(chip->work_space.context_buf);
+	kfree(chip->work_space.session_buf);
 	kfree(chip);
 }
 
+static void tpm_devs_release(struct device *dev)
+{
+	struct tpm_chip *chip = container_of(dev, struct tpm_chip, devs);
+
+	/* release the master device reference */
+	put_device(&chip->dev);
+}
+
 /**
  * tpm_chip_alloc() - allocate a new struct tpm_chip instance
  * @pdev: device to which the chip is associated
@@ -167,31 +178,65 @@ struct tpm_chip *tpm_chip_alloc(struct device *pdev,
 	chip->dev_num = rc;
 
 	device_initialize(&chip->dev);
+	device_initialize(&chip->devs);
 
 	chip->dev.class = tpm_class;
 	chip->dev.release = tpm_dev_release;
 	chip->dev.parent = pdev;
 	chip->dev.groups = chip->groups;
 
+	chip->devs.parent = pdev;
+	chip->devs.class = tpmrm_class;
+	chip->devs.release = tpm_devs_release;
+	/* get extra reference on main device to hold on
+	 * behalf of devs.  This holds the chip structure
+	 * while cdevs is in use.  The corresponding put
+	 * is in the tpm_devs_release (TPM2 only)
+	 */
+	if (chip->flags & TPM_CHIP_FLAG_TPM2)
+		get_device(&chip->dev);
+
 	if (chip->dev_num == 0)
 		chip->dev.devt = MKDEV(MISC_MAJOR, TPM_MINOR);
 	else
 		chip->dev.devt = MKDEV(MAJOR(tpm_devt), chip->dev_num);
 
+	chip->devs.devt =
+		MKDEV(MAJOR(tpm_devt), chip->dev_num + TPM_NUM_DEVICES);
+
 	rc = dev_set_name(&chip->dev, "tpm%d", chip->dev_num);
 	if (rc)
 		goto out;
+	rc = dev_set_name(&chip->devs, "tpmrm%d", chip->dev_num);
+	if (rc)
+		goto out;
 
 	if (!pdev)
 		chip->flags |= TPM_CHIP_FLAG_VIRTUAL;
 
 	cdev_init(&chip->cdev, &tpm_fops);
+	cdev_init(&chip->cdevs, &tpmrm_fops);
 	chip->cdev.owner = THIS_MODULE;
+	chip->cdevs.owner = THIS_MODULE;
 	chip->cdev.kobj.parent = &chip->dev.kobj;
+	chip->cdevs.kobj.parent = &chip->devs.kobj;
+
+	chip->work_space.context_buf = kzalloc(PAGE_SIZE, GFP_KERNEL);
+	if (!chip->work_space.context_buf) {
+		rc = -ENOMEM;
+		goto out;
+	}
+	chip->work_space.session_buf = kzalloc(PAGE_SIZE, GFP_KERNEL);
+	if (!chip->work_space.session_buf) {
+		rc = -ENOMEM;
+		goto out;
+	}
 
+	chip->locality = -1;
 	return chip;
 
 out:
+	put_device(&chip->devs);
 	put_device(&chip->dev);
 	return ERR_PTR(rc);
 }
@@ -236,7 +281,6 @@ static int tpm_add_char_device(struct tpm_chip *chip)
 			"unable to cdev_add() %s, major %d, minor %d, err=%d\n",
 			dev_name(&chip->dev), MAJOR(chip->dev.devt),
 			MINOR(chip->dev.devt), rc);
-
 		return rc;
 	}
 
@@ -251,6 +295,27 @@ static int tpm_add_char_device(struct tpm_chip *chip)
 		return rc;
 	}
 
+	if (chip->flags & TPM_CHIP_FLAG_TPM2)
+		rc = cdev_add(&chip->cdevs, chip->devs.devt, 1);
+	if (rc) {
+		dev_err(&chip->dev,
+			"unable to cdev_add() %s, major %d, minor %d, err=%d\n",
+			dev_name(&chip->devs), MAJOR(chip->devs.devt),
+			MINOR(chip->devs.devt), rc);
+		return rc;
+	}
+
+	if (chip->flags & TPM_CHIP_FLAG_TPM2)
+		rc = device_add(&chip->devs);
+	if (rc) {
+		dev_err(&chip->dev,
+			"unable to device_register() %s, major %d, minor %d, err=%d\n",
+			dev_name(&chip->devs), MAJOR(chip->devs.devt),
+			MINOR(chip->devs.devt), rc);
+		cdev_del(&chip->cdevs);
+		return rc;
+	}
+
 	/* Make the chip available. */
 	mutex_lock(&idr_lock);
 	idr_replace(&dev_nums_idr, chip, chip->dev_num);
@@ -384,6 +449,10 @@ void tpm_chip_unregister(struct tpm_chip *chip)
 {
 	tpm_del_legacy_sysfs(chip);
 	tpm_bios_log_teardown(chip);
+	if (chip->flags & TPM_CHIP_FLAG_TPM2) {
+		cdev_del(&chip->cdevs);
+		device_del(&chip->devs);
+	}
 	tpm_del_char_device(chip);
 }
 EXPORT_SYMBOL_GPL(tpm_chip_unregister);
diff --git a/drivers/char/tpm/tpm-dev-common.c b/drivers/char/tpm/tpm-dev-common.c
new file mode 100644
index 000000000000..610638a80383
--- /dev/null
+++ b/drivers/char/tpm/tpm-dev-common.c
@@ -0,0 +1,148 @@
+/*
+ * Copyright (C) 2004 IBM Corporation
+ * Authors:
+ * Leendert van Doorn <leendert@watson.ibm.com>
+ * Dave Safford <safford@watson.ibm.com>
+ * Reiner Sailer <sailer@watson.ibm.com>
+ * Kylene Hall <kjhall@us.ibm.com>
+ *
+ * Copyright (C) 2013 Obsidian Research Corp
+ * Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
+ *
+ * Device file system interface to the TPM
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, version 2 of the
+ * License.
+ *
+ */
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include "tpm.h"
+#include "tpm-dev.h"
+
+static void user_reader_timeout(unsigned long ptr)
+{
+	struct file_priv *priv = (struct file_priv *)ptr;
+
+	pr_warn("TPM user space timeout is deprecated (pid=%d)\n",
+		task_tgid_nr(current));
+
+	schedule_work(&priv->work);
+}
+
+static void timeout_work(struct work_struct *work)
+{
+	struct file_priv *priv = container_of(work, struct file_priv, work);
+
+	mutex_lock(&priv->buffer_mutex);
+	atomic_set(&priv->data_pending, 0);
+	memset(priv->data_buffer, 0, sizeof(priv->data_buffer));
+	mutex_unlock(&priv->buffer_mutex);
+}
+
+void tpm_common_open(struct file *file, struct tpm_chip *chip,
+		     struct file_priv *priv)
+{
+	priv->chip = chip;
+	atomic_set(&priv->data_pending, 0);
+	mutex_init(&priv->buffer_mutex);
+	setup_timer(&priv->user_read_timer, user_reader_timeout,
+			(unsigned long)priv);
+	INIT_WORK(&priv->work, timeout_work);
+
+	file->private_data = priv;
+}
+
+ssize_t tpm_common_read(struct file *file, char __user *buf,
+			size_t size, loff_t *off)
+{
+	struct file_priv *priv = file->private_data;
+	ssize_t ret_size;
+	ssize_t orig_ret_size;
+	int rc;
+
+	del_singleshot_timer_sync(&priv->user_read_timer);
+	flush_work(&priv->work);
+	ret_size = atomic_read(&priv->data_pending);
+	if (ret_size > 0) {	/* relay data */
+		orig_ret_size = ret_size;
+		if (size < ret_size)
+			ret_size = size;
+
+		mutex_lock(&priv->buffer_mutex);
+		rc = copy_to_user(buf, priv->data_buffer, ret_size);
+		memset(priv->data_buffer, 0, orig_ret_size);
+		if (rc)
+			ret_size = -EFAULT;
+
+		mutex_unlock(&priv->buffer_mutex);
+	}
+
+	atomic_set(&priv->data_pending, 0);
+
+	return ret_size;
+}
+
+ssize_t tpm_common_write(struct file *file, const char __user *buf,
+			 size_t size, loff_t *off, struct tpm_space *space)
+{
+	struct file_priv *priv = file->private_data;
+	size_t in_size = size;
+	ssize_t out_size;
+
+	/* Cannot perform a write until the read has cleared either via
+	 * tpm_read or a user_read_timer timeout. This also prevents split
+	 * buffered writes from blocking here.
+	 */
+	if (atomic_read(&priv->data_pending) != 0)
+		return -EBUSY;
+
+	if (in_size > TPM_BUFSIZE)
+		return -E2BIG;
+
+	mutex_lock(&priv->buffer_mutex);
+
+	if (copy_from_user
+	    (priv->data_buffer, (void __user *) buf, in_size)) {
+		mutex_unlock(&priv->buffer_mutex);
+		return -EFAULT;
+	}
+
+	/* atomic tpm command send and result receive. We only hold the ops
+	 * lock during this period so that the tpm can be unregistered even if
+	 * the char dev is held open.
+	 */
+	if (tpm_try_get_ops(priv->chip)) {
+		mutex_unlock(&priv->buffer_mutex);
+		return -EPIPE;
+	}
+	out_size = tpm_transmit(priv->chip, space, priv->data_buffer,
+				sizeof(priv->data_buffer), 0);
+
+	tpm_put_ops(priv->chip);
+	if (out_size < 0) {
+		mutex_unlock(&priv->buffer_mutex);
+		return out_size;
+	}
+
+	atomic_set(&priv->data_pending, out_size);
+	mutex_unlock(&priv->buffer_mutex);
+
+	/* Set a timeout by which the reader must come claim the result */
+	mod_timer(&priv->user_read_timer, jiffies + (120 * HZ));
+
+	return in_size;
+}
+
+/*
+ * Called on file close
+ */
+void tpm_common_release(struct file *file, struct file_priv *priv)
+{
+	del_singleshot_timer_sync(&priv->user_read_timer);
+	flush_work(&priv->work);
+	file->private_data = NULL;
+	atomic_set(&priv->data_pending, 0);
+}
diff --git a/drivers/char/tpm/tpm-dev.c b/drivers/char/tpm/tpm-dev.c
index 02a8850d3a69..ebd74ab5abef 100644
--- a/drivers/char/tpm/tpm-dev.c
+++ b/drivers/char/tpm/tpm-dev.c
@@ -18,48 +18,15 @@
  *
  */
 #include <linux/slab.h>
-#include <linux/uaccess.h>
-#include "tpm.h"
-
-struct file_priv {
-	struct tpm_chip *chip;
-
-	/* Data passed to and from the tpm via the read/write calls */
-	atomic_t data_pending;
-	struct mutex buffer_mutex;
-
-	struct timer_list user_read_timer;      /* user needs to claim result */
-	struct work_struct work;
-
-	u8 data_buffer[TPM_BUFSIZE];
-};
-
-static void user_reader_timeout(unsigned long ptr)
-{
-	struct file_priv *priv = (struct file_priv *)ptr;
-
-	pr_warn("TPM user space timeout is deprecated (pid=%d)\n",
-		task_tgid_nr(current));
-
-	schedule_work(&priv->work);
-}
-
-static void timeout_work(struct work_struct *work)
-{
-	struct file_priv *priv = container_of(work, struct file_priv, work);
-
-	mutex_lock(&priv->buffer_mutex);
-	atomic_set(&priv->data_pending, 0);
-	memset(priv->data_buffer, 0, sizeof(priv->data_buffer));
-	mutex_unlock(&priv->buffer_mutex);
-}
+#include "tpm-dev.h"
 
 static int tpm_open(struct inode *inode, struct file *file)
 {
-	struct tpm_chip *chip =
-		container_of(inode->i_cdev, struct tpm_chip, cdev);
+	struct tpm_chip *chip;
 	struct file_priv *priv;
 
+	chip = container_of(inode->i_cdev, struct tpm_chip, cdev);
+
 	/* It's assured that the chip will be opened just once,
 	 * by the check of is_open variable, which is protected
 	 * by driver_lock. */
@@ -69,100 +36,22 @@ static int tpm_open(struct inode *inode, struct file *file)
 	}
 
 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
-	if (priv == NULL) {
-		clear_bit(0, &chip->is_open);
-		return -ENOMEM;
-	}
+	if (priv == NULL)
+		goto out;
 
-	priv->chip = chip;
-	atomic_set(&priv->data_pending, 0);
-	mutex_init(&priv->buffer_mutex);
-	setup_timer(&priv->user_read_timer, user_reader_timeout,
-			(unsigned long)priv);
-	INIT_WORK(&priv->work, timeout_work);
+	tpm_common_open(file, chip, priv);
 
-	file->private_data = priv;
 	return 0;
-}
-
-static ssize_t tpm_read(struct file *file, char __user *buf,
-			size_t size, loff_t *off)
-{
-	struct file_priv *priv = file->private_data;
-	ssize_t ret_size;
-	int rc;
 
-	del_singleshot_timer_sync(&priv->user_read_timer);
-	flush_work(&priv->work);
-	ret_size = atomic_read(&priv->data_pending);
-	if (ret_size > 0) {	/* relay data */
-		ssize_t orig_ret_size = ret_size;
-		if (size < ret_size)
-			ret_size = size;
-
-		mutex_lock(&priv->buffer_mutex);
-		rc = copy_to_user(buf, priv->data_buffer, ret_size);
-		memset(priv->data_buffer, 0, orig_ret_size);
-		if (rc)
-			ret_size = -EFAULT;
-
-		mutex_unlock(&priv->buffer_mutex);
-	}
-
-	atomic_set(&priv->data_pending, 0);
-
-	return ret_size;
+ out:
+	clear_bit(0, &chip->is_open);
+	return -ENOMEM;
 }
 
 static ssize_t tpm_write(struct file *file, const char __user *buf,
 			 size_t size, loff_t *off)
 {
-	struct file_priv *priv = file->private_data;
-	size_t in_size = size;
-	ssize_t out_size;
-
-	/* cannot perform a write until the read has cleared
-	   either via tpm_read or a user_read_timer timeout.
-	   This also prevents splitted buffered writes from blocking here.
-	*/
-	if (atomic_read(&priv->data_pending) != 0)
-		return -EBUSY;
-
-	if (in_size > TPM_BUFSIZE)
-		return -E2BIG;
-
-	mutex_lock(&priv->buffer_mutex);
-
-	if (copy_from_user
-	    (priv->data_buffer, (void __user *) buf, in_size)) {
-		mutex_unlock(&priv->buffer_mutex);
-		return -EFAULT;
-	}
-
-	/* atomic tpm command send and result receive. We only hold the ops
-	 * lock during this period so that the tpm can be unregistered even if
-	 * the char dev is held open.
-	 */
-	if (tpm_try_get_ops(priv->chip)) {
-		mutex_unlock(&priv->buffer_mutex);
-		return -EPIPE;
-	}
-	out_size = tpm_transmit(priv->chip, priv->data_buffer,
-				sizeof(priv->data_buffer), 0);
-
-	tpm_put_ops(priv->chip);
-	if (out_size < 0) {
-		mutex_unlock(&priv->buffer_mutex);
-		return out_size;
-	}
-
-	atomic_set(&priv->data_pending, out_size);
-	mutex_unlock(&priv->buffer_mutex);
-
-	/* Set a timeout by which the reader must come claim the result */
-	mod_timer(&priv->user_read_timer, jiffies + (120 * HZ));
-
-	return in_size;
+	return tpm_common_write(file, buf, size, off, NULL);
 }
 
 /*
@@ -172,12 +61,10 @@ static int tpm_release(struct inode *inode, struct file *file)
 {
 	struct file_priv *priv = file->private_data;
 
-	del_singleshot_timer_sync(&priv->user_read_timer);
-	flush_work(&priv->work);
-	file->private_data = NULL;
-	atomic_set(&priv->data_pending, 0);
+	tpm_common_release(file, priv);
 	clear_bit(0, &priv->chip->is_open);
 	kfree(priv);
+
 	return 0;
 }
 
@@ -185,9 +72,7 @@ const struct file_operations tpm_fops = {
 	.owner = THIS_MODULE,
 	.llseek = no_llseek,
 	.open = tpm_open,
-	.read = tpm_read,
+	.read = tpm_common_read,
 	.write = tpm_write,
 	.release = tpm_release,
 };
-
-
diff --git a/drivers/char/tpm/tpm-dev.h b/drivers/char/tpm/tpm-dev.h
new file mode 100644
index 000000000000..ff15cf719bad
--- /dev/null
+++ b/drivers/char/tpm/tpm-dev.h
@@ -0,0 +1,27 @@
+#ifndef _TPM_DEV_H
+#define _TPM_DEV_H
+
+#include "tpm.h"
+
+struct file_priv {
+	struct tpm_chip *chip;
+
+	/* Data passed to and from the tpm via the read/write calls */
+	atomic_t data_pending;
+	struct mutex buffer_mutex;
+
+	struct timer_list user_read_timer;      /* user needs to claim result */
+	struct work_struct work;
+
+	u8 data_buffer[TPM_BUFSIZE];
+};
+
+void tpm_common_open(struct file *file, struct tpm_chip *chip,
+		     struct file_priv *priv);
+ssize_t tpm_common_read(struct file *file, char __user *buf,
+			size_t size, loff_t *off);
+ssize_t tpm_common_write(struct file *file, const char __user *buf,
+			 size_t size, loff_t *off, struct tpm_space *space);
+void tpm_common_release(struct file *file, struct file_priv *priv);
+
+#endif
diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index bd2128e0b56c..158c1db83f05 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -328,6 +328,47 @@ unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip,
 }
 EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration);
 
+static bool tpm_validate_command(struct tpm_chip *chip,
+				 struct tpm_space *space,
+				 const u8 *cmd,
+				 size_t len)
+{
+	const struct tpm_input_header *header = (const void *)cmd;
+	int i;
+	u32 cc;
+	u32 attrs;
+	unsigned int nr_handles;
+
+	if (len < TPM_HEADER_SIZE)
+		return false;
+
+	if (!space)
+		return true;
+
+	if (chip->flags & TPM_CHIP_FLAG_TPM2 && chip->nr_commands) {
+		cc = be32_to_cpu(header->ordinal);
+
+		i = tpm2_find_cc(chip, cc);
+		if (i < 0) {
+			dev_dbg(&chip->dev, "0x%04X is an invalid command\n",
+				cc);
+			return false;
+		}
+
+		attrs = chip->cc_attrs_tbl[i];
+		nr_handles =
+			4 * ((attrs >> TPM2_CC_ATTR_CHANDLES) & GENMASK(2, 0));
+		if (len < TPM_HEADER_SIZE + 4 * nr_handles)
+			goto err_len;
+	}
+
+	return true;
+err_len:
+	dev_dbg(&chip->dev,
+		"%s: insufficient command length %zu", __func__, len);
+	return false;
+}
+
 /**
  * tmp_transmit - Internal kernel interface to transmit TPM commands.
  *
@@ -340,14 +381,17 @@ EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration);
  *     0 when the operation is successful.
  *     A negative number for system errors (errno).
  */
-ssize_t tpm_transmit(struct tpm_chip *chip, const u8 *buf, size_t bufsiz,
-		     unsigned int flags)
+ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space,
+		     u8 *buf, size_t bufsiz, unsigned int flags)
 {
-	ssize_t rc;
+	struct tpm_output_header *header = (void *)buf;
+	int rc;
+	ssize_t len = 0;
 	u32 count, ordinal;
 	unsigned long stop;
+	bool need_locality;
 
-	if (bufsiz < TPM_HEADER_SIZE)
+	if (!tpm_validate_command(chip, space, buf, bufsiz))
 		return -EINVAL;
 
 	if (bufsiz > TPM_BUFSIZE)
@@ -369,10 +413,24 @@ ssize_t tpm_transmit(struct tpm_chip *chip, const u8 *buf, size_t bufsiz,
 	if (chip->dev.parent)
 		pm_runtime_get_sync(chip->dev.parent);
 
+	/* Store the decision as chip->locality will be changed. */
+	need_locality = chip->locality == -1;
+
+	if (need_locality && chip->ops->request_locality)  {
+		rc = chip->ops->request_locality(chip, 0);
+		if (rc < 0)
+			goto out_no_locality;
+		chip->locality = rc;
+	}
+
+	rc = tpm2_prepare_space(chip, space, ordinal, buf);
+	if (rc)
+		goto out;
+
 	rc = chip->ops->send(chip, (u8 *) buf, count);
 	if (rc < 0) {
 		dev_err(&chip->dev,
-			"tpm_transmit: tpm_send: error %zd\n", rc);
+			"tpm_transmit: tpm_send: error %d\n", rc);
 		goto out;
 	}
 
@@ -405,17 +463,36 @@ ssize_t tpm_transmit(struct tpm_chip *chip, const u8 *buf, size_t bufsiz,
 	goto out;
 
 out_recv:
-	rc = chip->ops->recv(chip, (u8 *) buf, bufsiz);
-	if (rc < 0)
+	len = chip->ops->recv(chip, (u8 *) buf, bufsiz);
+	if (len < 0) {
+		rc = len;
 		dev_err(&chip->dev,
-			"tpm_transmit: tpm_recv: error %zd\n", rc);
+			"tpm_transmit: tpm_recv: error %d\n", rc);
+		goto out;
+	} else if (len < TPM_HEADER_SIZE) {
+		rc = -EFAULT;
+		goto out;
+	}
+
+	if (len != be32_to_cpu(header->length)) {
+		rc = -EFAULT;
+		goto out;
+	}
+
+	rc = tpm2_commit_space(chip, space, ordinal, buf, &len);
+
 out:
+	if (need_locality && chip->ops->relinquish_locality) {
+		chip->ops->relinquish_locality(chip, chip->locality);
+		chip->locality = -1;
+	}
+out_no_locality:
 	if (chip->dev.parent)
 		pm_runtime_put_sync(chip->dev.parent);
 
 	if (!(flags & TPM_TRANSMIT_UNLOCKED))
 		mutex_unlock(&chip->tpm_mutex);
-	return rc;
+	return rc ? rc : len;
 }
 
 /**
@@ -434,23 +511,18 @@ out:
  *     A negative number for system errors (errno).
  *     A positive number for a TPM error.
  */
-ssize_t tpm_transmit_cmd(struct tpm_chip *chip, const void *buf,
-			 size_t bufsiz, size_t min_rsp_body_length,
-			 unsigned int flags, const char *desc)
+ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct tpm_space *space,
+			 const void *buf, size_t bufsiz,
+			 size_t min_rsp_body_length, unsigned int flags,
+			 const char *desc)
 {
-	const struct tpm_output_header *header;
+	const struct tpm_output_header *header = buf;
 	int err;
 	ssize_t len;
 
-	len = tpm_transmit(chip, (const u8 *)buf, bufsiz, flags);
+	len = tpm_transmit(chip, space, (u8 *)buf, bufsiz, flags);
 	if (len <  0)
 		return len;
-	else if (len < TPM_HEADER_SIZE)
-		return -EFAULT;
-
-	header = buf;
-	if (len != be32_to_cpu(header->length))
-		return -EFAULT;
 
 	err = be32_to_cpu(header->return_code);
 	if (err != 0 && desc)
@@ -501,7 +573,7 @@ ssize_t tpm_getcap(struct tpm_chip *chip, u32 subcap_id, cap_t *cap,
 		tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
 		tpm_cmd.params.getcap_in.subcap = cpu_to_be32(subcap_id);
 	}
-	rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
+	rc = tpm_transmit_cmd(chip, NULL, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
 			      min_cap_length, 0, desc);
 	if (!rc)
 		*cap = tpm_cmd.params.getcap_out.cap;
@@ -525,7 +597,8 @@ static int tpm_startup(struct tpm_chip *chip, __be16 startup_type)
 	start_cmd.header.in = tpm_startup_header;
 
 	start_cmd.params.startup_in.startup_type = startup_type;
-	return tpm_transmit_cmd(chip, &start_cmd, TPM_INTERNAL_RESULT_SIZE, 0,
+	return tpm_transmit_cmd(chip, NULL, &start_cmd,
+				TPM_INTERNAL_RESULT_SIZE, 0,
 				0, "attempting to start the TPM");
 }
 
@@ -682,8 +755,8 @@ static int tpm_continue_selftest(struct tpm_chip *chip)
 	struct tpm_cmd_t cmd;
 
 	cmd.header.in = continue_selftest_header;
-	rc = tpm_transmit_cmd(chip, &cmd, CONTINUE_SELFTEST_RESULT_SIZE, 0, 0,
-			      "continue selftest");
+	rc = tpm_transmit_cmd(chip, NULL, &cmd, CONTINUE_SELFTEST_RESULT_SIZE,
+			      0, 0, "continue selftest");
 	return rc;
 }