From: Jarkko Sakkinen <jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
To: tpmdd-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
Cc: open list <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
James Bottomley
<James.Bottomley-d9PhHud1JfjCXq6kfMZ53/egYHeGw8Jk@public.gmane.org>,
linux-security-module-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: [PATCH 4/6] tpm: split out tpm-dev.c into tpm-dev.c and tpm-common-dev.c
Date: Wed, 8 Feb 2017 13:07:06 +0200 [thread overview]
Message-ID: <20170208110713.14070-5-jarkko.sakkinen@linux.intel.com> (raw)
In-Reply-To: <20170208110713.14070-1-jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
From: James Bottomley <James.Bottomley-d9PhHud1JfjCXq6kfMZ53/egYHeGw8Jk@public.gmane.org>
Signed-off-by: James Bottomley <James.Bottomley-d9PhHud1JfjCXq6kfMZ53/egYHeGw8Jk@public.gmane.org>
---
drivers/char/tpm/Makefile | 2 +-
drivers/char/tpm/tpm-dev-common.c | 148 ++++++++++++++++++++++++++++++++++++++
drivers/char/tpm/tpm-dev.c | 143 ++++--------------------------------
drivers/char/tpm/tpm-dev.h | 27 +++++++
4 files changed, 190 insertions(+), 130 deletions(-)
create mode 100644 drivers/char/tpm/tpm-dev-common.c
create mode 100644 drivers/char/tpm/tpm-dev.h
diff --git a/drivers/char/tpm/Makefile b/drivers/char/tpm/Makefile
index 8f07fcf..10e5827 100644
--- a/drivers/char/tpm/Makefile
+++ b/drivers/char/tpm/Makefile
@@ -3,7 +3,7 @@
#
obj-$(CONFIG_TCG_TPM) += tpm.o
tpm-y := tpm-interface.o tpm-dev.o tpm-sysfs.o tpm-chip.o tpm2-cmd.o \
- tpm1_eventlog.o tpm2_eventlog.o tpm2-space.o
+ tpm-dev-common.o tpm1_eventlog.o tpm2_eventlog.o tpm2-space.o
tpm-$(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/tpm-dev-common.c b/drivers/char/tpm/tpm-dev-common.c
new file mode 100644
index 0000000..610638a
--- /dev/null
+++ b/drivers/char/tpm/tpm-dev-common.c
@@ -0,0 +1,148 @@
+/*
+ * Copyright (C) 2004 IBM Corporation
+ * Authors:
+ * Leendert van Doorn <leendert-aZOuKsOsJu3MbYB6QlFGEg@public.gmane.org>
+ * Dave Safford <safford-aZOuKsOsJu3MbYB6QlFGEg@public.gmane.org>
+ * Reiner Sailer <sailer-aZOuKsOsJu3MbYB6QlFGEg@public.gmane.org>
+ * Kylene Hall <kjhall-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
+ *
+ * Copyright (C) 2013 Obsidian Research Corp
+ * Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
+ *
+ * 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 414553b..ebd74ab 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, NULL, 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 0000000..ff15cf7
--- /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
--
2.9.3
------------------------------------------------------------------------------
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next prev parent reply other threads:[~2017-02-08 11:07 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-08 11:07 [PATCH 0/6] in-kernel resource manager Jarkko Sakkinen
[not found] ` <20170208110713.14070-1-jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2017-02-08 11:07 ` [PATCH 1/6] tpm: validate TPM 2.0 commands Jarkko Sakkinen
2017-02-08 11:07 ` [PATCH 2/6] tpm: export tpm2_flush_context_cmd Jarkko Sakkinen
[not found] ` <20170208110713.14070-3-jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2017-02-08 17:58 ` Jason Gunthorpe
[not found] ` <20170208175830.GA31571-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2017-02-10 7:42 ` Jarkko Sakkinen
2017-02-08 11:07 ` [PATCH 3/6] tpm: infrastructure for TPM spaces Jarkko Sakkinen
[not found] ` <20170208110713.14070-4-jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2017-03-23 15:40 ` [PATCH linux-next] tmp2: fix an off by one bug Vincent Stehlé
[not found] ` <20170323154029.27816-1-vincent.stehle-QFKgK+z4sOrR7s880joybQ@public.gmane.org>
2017-03-23 18:15 ` Jarkko Sakkinen
2017-02-08 11:07 ` Jarkko Sakkinen [this message]
2017-02-08 11:07 ` [PATCH 5/6] tpm: expose spaces via a device link /dev/tpms<n> Jarkko Sakkinen
2017-02-08 11:07 ` [PATCH 6/6] tpm2: add session handle context saving and restoring to the space code Jarkko Sakkinen
[not found] ` <20170208110713.14070-7-jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2017-02-10 8:52 ` Jarkko Sakkinen
[not found] ` <20170210085256.eqhnrmdug2fcz4ql-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2017-02-10 16:11 ` James Bottomley
2017-02-10 19:07 ` [PATCH 6/6] tpm2: add session handle context saving and restoring to the space code' Jarkko Sakkinen
2017-02-10 12:32 ` [PATCH 6/6] tpm2: add session handle context saving and restoring to the space code Jarkko Sakkinen
[not found] ` <20170210123249.nrppoez2kdr2q4nw-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2017-02-10 16:17 ` James Bottomley
[not found] ` <1486743431.2502.6.camel-d9PhHud1JfjCXq6kfMZ53/egYHeGw8Jk@public.gmane.org>
2017-02-10 19:10 ` Jarkko Sakkinen
[not found] ` <20170210191004.yv5hgnd3h5scj5zt-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2017-02-10 19:12 ` James Bottomley
2017-02-10 22:48 ` [tpmdd-devel] " Jarkko Sakkinen
2017-02-10 8:53 ` [PATCH 0/6] in-kernel resource manager Jarkko Sakkinen
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