tpmdd fixes for Linux v5.5-rc3

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Merge tag 'tpmdd-next-20191219' of git://git.infradead.org/users/jjs/linux-tpmdd

Pull tpm fixes from Jarkko Sakkinen:
 "Bunch of fixes for rc3"

* tag 'tpmdd-next-20191219' of git://git.infradead.org/users/jjs/linux-tpmdd:
  tpm/tpm_ftpm_tee: add shutdown call back
  tpm: selftest: cleanup after unseal with wrong auth/policy test
  tpm: selftest: add test covering async mode
  tpm: fix invalid locking in NONBLOCKING mode
  security: keys: trusted: fix lost handle flush
  tpm_tis: reserve chip for duration of tpm_tis_core_init
  KEYS: asymmetric: return ENOMEM if akcipher_request_alloc() fails
  KEYS: remove CONFIG_KEYS_COMPAT

crypto/asymmetric_keys/asym_tpm.c

@@ -470,6 +470,7 @@ static int tpm_key_encrypt(struct tpm_key *tk,
 	if (ret < 0)
 		goto error_free_tfm;
 
+	ret = -ENOMEM;
 	req = akcipher_request_alloc(tfm, GFP_KERNEL);
 	if (!req)
 		goto error_free_tfm;

crypto/asymmetric_keys/public_key.c

@@ -184,6 +184,7 @@ static int software_key_eds_op(struct kernel_pkey_params *params,
 	if (IS_ERR(tfm))
 		return PTR_ERR(tfm);
 
+	ret = -ENOMEM;
 	req = akcipher_request_alloc(tfm, GFP_KERNEL);
 	if (!req)
 		goto error_free_tfm;

drivers/char/tpm/tpm-dev-common.c

@@ -61,6 +61,12 @@ static void tpm_dev_async_work(struct work_struct *work)
 
 	mutex_lock(&priv->buffer_mutex);
 	priv->command_enqueued = false;
+	ret = tpm_try_get_ops(priv->chip);
+	if (ret) {
+		priv->response_length = ret;
+		goto out;
+	}
+
 	ret = tpm_dev_transmit(priv->chip, priv->space, priv->data_buffer,
 			       sizeof(priv->data_buffer));
 	tpm_put_ops(priv->chip);
@@ -68,6 +74,7 @@ static void tpm_dev_async_work(struct work_struct *work)
 		priv->response_length = ret;
 		mod_timer(&priv->user_read_timer, jiffies + (120 * HZ));
 	}
+out:
 	mutex_unlock(&priv->buffer_mutex);
 	wake_up_interruptible(&priv->async_wait);
 }
@@ -204,6 +211,7 @@ ssize_t tpm_common_write(struct file *file, const char __user *buf,
 	if (file->f_flags & O_NONBLOCK) {
 		priv->command_enqueued = true;
 		queue_work(tpm_dev_wq, &priv->async_work);
+		tpm_put_ops(priv->chip);
 		mutex_unlock(&priv->buffer_mutex);
 		return size;
 	}

drivers/char/tpm/tpm.h

@@ -218,7 +218,6 @@ int tpm2_pcr_read(struct tpm_chip *chip, u32 pcr_idx,
 int tpm2_pcr_extend(struct tpm_chip *chip, u32 pcr_idx,
 		    struct tpm_digest *digests);
 int tpm2_get_random(struct tpm_chip *chip, u8 *dest, size_t max);
-void tpm2_flush_context(struct tpm_chip *chip, u32 handle);
 ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id,
 			u32 *value, const char *desc);
 

drivers/char/tpm/tpm2-cmd.c

@@ -362,6 +362,7 @@ void tpm2_flush_context(struct tpm_chip *chip, u32 handle)
 	tpm_transmit_cmd(chip, &buf, 0, "flushing context");
 	tpm_buf_destroy(&buf);
 }
+EXPORT_SYMBOL_GPL(tpm2_flush_context);
 
 struct tpm2_get_cap_out {
 	u8 more_data;

drivers/char/tpm/tpm_ftpm_tee.c

@@ -32,7 +32,7 @@ static const uuid_t ftpm_ta_uuid =
 		  0x82, 0xCB, 0x34, 0x3F, 0xB7, 0xF3, 0x78, 0x96);
 
 /**
- * ftpm_tee_tpm_op_recv - retrieve fTPM response.
+ * ftpm_tee_tpm_op_recv() - retrieve fTPM response.
  * @chip:	the tpm_chip description as specified in driver/char/tpm/tpm.h.
  * @buf:	the buffer to store data.
  * @count:	the number of bytes to read.
@@ -61,7 +61,7 @@ static int ftpm_tee_tpm_op_recv(struct tpm_chip *chip, u8 *buf, size_t count)
 }
 
 /**
- * ftpm_tee_tpm_op_send - send TPM commands through the TEE shared memory.
+ * ftpm_tee_tpm_op_send() - send TPM commands through the TEE shared memory.
  * @chip:	the tpm_chip description as specified in driver/char/tpm/tpm.h
  * @buf:	the buffer to send.
  * @len:	the number of bytes to send.
@@ -208,7 +208,7 @@ static int ftpm_tee_match(struct tee_ioctl_version_data *ver, const void *data)
 }
 
 /**
- * ftpm_tee_probe - initialize the fTPM
+ * ftpm_tee_probe() - initialize the fTPM
  * @pdev: the platform_device description.
  *
  * Return:
@@ -298,7 +298,7 @@ out_tee_session:
 }
 
 /**
- * ftpm_tee_remove - remove the TPM device
+ * ftpm_tee_remove() - remove the TPM device
  * @pdev: the platform_device description.
  *
  * Return:
@@ -328,6 +328,19 @@ static int ftpm_tee_remove(struct platform_device *pdev)
 	return 0;
 }
 
+/**
+ * ftpm_tee_shutdown() - shutdown the TPM device
+ * @pdev: the platform_device description.
+ */
+static void ftpm_tee_shutdown(struct platform_device *pdev)
+{
+	struct ftpm_tee_private *pvt_data = dev_get_drvdata(&pdev->dev);
+
+	tee_shm_free(pvt_data->shm);
+	tee_client_close_session(pvt_data->ctx, pvt_data->session);
+	tee_client_close_context(pvt_data->ctx);
+}
+
 static const struct of_device_id of_ftpm_tee_ids[] = {
 	{ .compatible = "microsoft,ftpm" },
 	{ }
@@ -341,6 +354,7 @@ static struct platform_driver ftpm_tee_driver = {
 	},
 	.probe = ftpm_tee_probe,
 	.remove = ftpm_tee_remove,
+	.shutdown = ftpm_tee_shutdown,
 };
 
 module_platform_driver(ftpm_tee_driver);

drivers/char/tpm/tpm_tis_core.c

@@ -978,13 +978,13 @@ int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq,
 
 	if (wait_startup(chip, 0) != 0) {
 		rc = -ENODEV;
-		goto out_err;
+		goto err_start;
 	}
 
 	/* Take control of the TPM's interrupt hardware and shut it off */
 	rc = tpm_tis_read32(priv, TPM_INT_ENABLE(priv->locality), &intmask);
 	if (rc < 0)
-		goto out_err;
+		goto err_start;
 
 	intmask |= TPM_INTF_CMD_READY_INT | TPM_INTF_LOCALITY_CHANGE_INT |
 		   TPM_INTF_DATA_AVAIL_INT | TPM_INTF_STS_VALID_INT;
@@ -993,21 +993,21 @@ int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq,
 
 	rc = tpm_chip_start(chip);
 	if (rc)
-		goto out_err;
+		goto err_start;
+
 	rc = tpm2_probe(chip);
-	tpm_chip_stop(chip);
 	if (rc)
-		goto out_err;
+		goto err_probe;
 
 	rc = tpm_tis_read32(priv, TPM_DID_VID(0), &vendor);
 	if (rc < 0)
-		goto out_err;
+		goto err_probe;
 
 	priv->manufacturer_id = vendor;
 
 	rc = tpm_tis_read8(priv, TPM_RID(0), &rid);
 	if (rc < 0)
-		goto out_err;
+		goto err_probe;
 
 	dev_info(dev, "%s TPM (device-id 0x%X, rev-id %d)\n",
 		 (chip->flags & TPM_CHIP_FLAG_TPM2) ? "2.0" : "1.2",
@@ -1016,13 +1016,13 @@ int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq,
 	probe = probe_itpm(chip);
 	if (probe < 0) {
 		rc = -ENODEV;
-		goto out_err;
+		goto err_probe;
 	}
 
 	/* Figure out the capabilities */
 	rc = tpm_tis_read32(priv, TPM_INTF_CAPS(priv->locality), &intfcaps);
 	if (rc < 0)
-		goto out_err;
+		goto err_probe;
 
 	dev_dbg(dev, "TPM interface capabilities (0x%x):\n",
 		intfcaps);
@@ -1056,10 +1056,9 @@ int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq,
 		if (tpm_get_timeouts(chip)) {
 			dev_err(dev, "Could not get TPM timeouts and durations\n");
 			rc = -ENODEV;
-			goto out_err;
+			goto err_probe;
 		}
 
-		tpm_chip_start(chip);
 		chip->flags |= TPM_CHIP_FLAG_IRQ;
 		if (irq) {
 			tpm_tis_probe_irq_single(chip, intmask, IRQF_SHARED,
@@ -1070,18 +1069,20 @@ int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq,
 		} else {
 			tpm_tis_probe_irq(chip, intmask);
 		}
-		tpm_chip_stop(chip);
 	}
 
+	tpm_chip_stop(chip);
+
 	rc = tpm_chip_register(chip);
 	if (rc)
-		goto out_err;
+		goto err_start;
-
-	if (chip->ops->clk_enable != NULL)
-		chip->ops->clk_enable(chip, false);
 
 	return 0;
-out_err:
+
+err_probe:
+	tpm_chip_stop(chip);
+
+err_start:
 	if ((chip->ops != NULL) && (chip->ops->clk_enable != NULL))
 		chip->ops->clk_enable(chip, false);
 

include/linux/tpm.h

@@ -403,6 +403,7 @@ extern int tpm_pcr_extend(struct tpm_chip *chip, u32 pcr_idx,
 extern int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen);
 extern int tpm_get_random(struct tpm_chip *chip, u8 *data, size_t max);
 extern struct tpm_chip *tpm_default_chip(void);
+void tpm2_flush_context(struct tpm_chip *chip, u32 handle);
 #else
 static inline int tpm_is_tpm2(struct tpm_chip *chip)
 {

security/keys/Kconfig

@@ -21,10 +21,6 @@ config KEYS
 
 	  If you are unsure as to whether this is required, answer N.
 
-config KEYS_COMPAT
-	def_bool y
-	depends on COMPAT && KEYS
-
 config KEYS_REQUEST_CACHE
 	bool "Enable temporary caching of the last request_key() result"
 	depends on KEYS

security/keys/Makefile

@@ -17,7 +17,7 @@ obj-y := \
 	request_key_auth.o \
 	user_defined.o
 compat-obj-$(CONFIG_KEY_DH_OPERATIONS) += compat_dh.o
-obj-$(CONFIG_KEYS_COMPAT) += compat.o $(compat-obj-y)
+obj-$(CONFIG_COMPAT) += compat.o $(compat-obj-y)
 obj-$(CONFIG_PROC_FS) += proc.o
 obj-$(CONFIG_SYSCTL) += sysctl.o
 obj-$(CONFIG_PERSISTENT_KEYRINGS) += persistent.o

security/keys/compat.c

@@ -46,11 +46,6 @@ static long compat_keyctl_instantiate_key_iov(
 
 /*
  * The key control system call, 32-bit compatibility version for 64-bit archs
- *
- * This should only be called if the 64-bit arch uses weird pointers in 32-bit
- * mode or doesn't guarantee that the top 32-bits of the argument registers on
- * taking a 32-bit syscall are zero.  If you can, you should call sys_keyctl()
- * directly.
  */
 COMPAT_SYSCALL_DEFINE5(keyctl, u32, option,
 		       u32, arg2, u32, arg3, u32, arg4, u32, arg5)

security/keys/internal.h

@@ -264,7 +264,7 @@ extern long keyctl_dh_compute(struct keyctl_dh_params __user *, char __user *,
 			      size_t, struct keyctl_kdf_params __user *);
 extern long __keyctl_dh_compute(struct keyctl_dh_params __user *, char __user *,
 				size_t, struct keyctl_kdf_params *);
-#ifdef CONFIG_KEYS_COMPAT
+#ifdef CONFIG_COMPAT
 extern long compat_keyctl_dh_compute(struct keyctl_dh_params __user *params,
 				char __user *buffer, size_t buflen,
 				struct compat_keyctl_kdf_params __user *kdf);
@@ -279,7 +279,7 @@ static inline long keyctl_dh_compute(struct keyctl_dh_params __user *params,
 	return -EOPNOTSUPP;
 }
 
-#ifdef CONFIG_KEYS_COMPAT
+#ifdef CONFIG_COMPAT
 static inline long compat_keyctl_dh_compute(
 				struct keyctl_dh_params __user *params,
 				char __user *buffer, size_t buflen,

security/keys/trusted-keys/trusted_tpm2.c

@@ -309,6 +309,7 @@ int tpm2_unseal_trusted(struct tpm_chip *chip,
 		return rc;
 
 	rc = tpm2_unseal_cmd(chip, payload, options, blob_handle);
+	tpm2_flush_context(chip, blob_handle);
 
 	return rc;
 }

tools/testing/selftests/tpm2/test_smoke.sh

@@ -2,3 +2,9 @@
 # SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
 
 python -m unittest -v tpm2_tests.SmokeTest
+python -m unittest -v tpm2_tests.AsyncTest
+
+CLEAR_CMD=$(which tpm2_clear)
+if [ -n $CLEAR_CMD ]; then
+	tpm2_clear -T device
+fi

tools/testing/selftests/tpm2/tpm2.py

@@ -6,8 +6,8 @@ import socket
 import struct
 import sys
 import unittest
-from fcntl import ioctl
+import fcntl
-
+import select
 
 TPM2_ST_NO_SESSIONS = 0x8001
 TPM2_ST_SESSIONS = 0x8002
@@ -352,6 +352,7 @@ def hex_dump(d):
 class Client:
     FLAG_DEBUG = 0x01
     FLAG_SPACE = 0x02
+    FLAG_NONBLOCK = 0x04
     TPM_IOC_NEW_SPACE = 0xa200
 
     def __init__(self, flags = 0):
@@ -362,13 +363,27 @@ class Client:
         else:
             self.tpm = open('/dev/tpmrm0', 'r+b', buffering=0)
 
+        if (self.flags & Client.FLAG_NONBLOCK):
+            flags = fcntl.fcntl(self.tpm, fcntl.F_GETFL)
+            flags |= os.O_NONBLOCK
+            fcntl.fcntl(self.tpm, fcntl.F_SETFL, flags)
+            self.tpm_poll = select.poll()
+
     def close(self):
         self.tpm.close()
 
     def send_cmd(self, cmd):
         self.tpm.write(cmd)
+
+        if (self.flags & Client.FLAG_NONBLOCK):
+            self.tpm_poll.register(self.tpm, select.POLLIN)
+            self.tpm_poll.poll(10000)
+
         rsp = self.tpm.read()
 
+        if (self.flags & Client.FLAG_NONBLOCK):
+            self.tpm_poll.unregister(self.tpm)
+
         if (self.flags & Client.FLAG_DEBUG) != 0:
             sys.stderr.write('cmd' + os.linesep)
             sys.stderr.write(hex_dump(cmd) + os.linesep)

tools/testing/selftests/tpm2/tpm2_tests.py

@@ -288,3 +288,16 @@ class SpaceTest(unittest.TestCase):
 
         self.assertEqual(rc, tpm2.TPM2_RC_COMMAND_CODE |
                          tpm2.TSS2_RESMGR_TPM_RC_LAYER)
+
+class AsyncTest(unittest.TestCase):
+    def setUp(self):
+        logging.basicConfig(filename='AsyncTest.log', level=logging.DEBUG)
+
+    def test_async(self):
+        log = logging.getLogger(__name__)
+        log.debug(sys._getframe().f_code.co_name)
+
+        async_client = tpm2.Client(tpm2.Client.FLAG_NONBLOCK)
+        log.debug("Calling get_cap in a NON_BLOCKING mode")
+        async_client.get_cap(tpm2.TPM2_CAP_HANDLES, tpm2.HR_LOADED_SESSION)
+        async_client.close()