root/drivers/char/tpm/tpm_vtpm_proxy.c

DEFINITIONS

1. vtpm_proxy_fops_read
2. vtpm_proxy_fops_write
3. vtpm_proxy_fops_poll
4. vtpm_proxy_fops_open
5. vtpm_proxy_fops_undo_open
6. vtpm_proxy_fops_release
7. vtpm_proxy_tpm_op_recv
8. vtpm_proxy_is_driver_command
9. vtpm_proxy_tpm_op_send
10. vtpm_proxy_tpm_op_cancel
11. vtpm_proxy_tpm_op_status
12. vtpm_proxy_tpm_req_canceled
13. vtpm_proxy_request_locality
14. vtpm_proxy_work
15. vtpm_proxy_work_stop
16. vtpm_proxy_work_start
17. vtpm_proxy_create_proxy_dev
18. vtpm_proxy_delete_proxy_dev
19. vtpm_proxy_create_device
20. vtpm_proxy_delete_device
21. vtpmx_ioc_new_dev
22. vtpmx_fops_ioctl
23. vtpmx_fops_compat_ioctl
24. vtpmx_init
25. vtpmx_cleanup
26. vtpm_module_init
27. vtpm_module_exit

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2015, 2016 IBM Corporation
   4  * Copyright (C) 2016 Intel Corporation
   5  *
   6  * Author: Stefan Berger <stefanb@us.ibm.com>
   7  *
   8  * Maintained by: <tpmdd-devel@lists.sourceforge.net>
   9  *
  10  * Device driver for vTPM (vTPM proxy driver)
  11  */
  12 
  13 #include <linux/types.h>
  14 #include <linux/spinlock.h>
  15 #include <linux/uaccess.h>
  16 #include <linux/wait.h>
  17 #include <linux/miscdevice.h>
  18 #include <linux/vtpm_proxy.h>
  19 #include <linux/file.h>
  20 #include <linux/anon_inodes.h>
  21 #include <linux/poll.h>
  22 #include <linux/compat.h>
  23 
  24 #include "tpm.h"
  25 
  26 #define VTPM_PROXY_REQ_COMPLETE_FLAG  BIT(0)
  27 
  28 struct proxy_dev {
  29         struct tpm_chip *chip;
  30 
  31         u32 flags;                   /* public API flags */
  32 
  33         wait_queue_head_t wq;
  34 
  35         struct mutex buf_lock;       /* protect buffer and flags */
  36 
  37         long state;                  /* internal state */
  38 #define STATE_OPENED_FLAG        BIT(0)
  39 #define STATE_WAIT_RESPONSE_FLAG BIT(1)  /* waiting for emulator response */
  40 #define STATE_REGISTERED_FLAG    BIT(2)
  41 #define STATE_DRIVER_COMMAND     BIT(3)  /* sending a driver specific command */
  42 
  43         size_t req_len;              /* length of queued TPM request */
  44         size_t resp_len;             /* length of queued TPM response */
  45         u8 buffer[TPM_BUFSIZE];      /* request/response buffer */
  46 
  47         struct work_struct work;     /* task that retrieves TPM timeouts */
  48 };
  49 
  50 /* all supported flags */
  51 #define VTPM_PROXY_FLAGS_ALL  (VTPM_PROXY_FLAG_TPM2)
  52 
  53 static struct workqueue_struct *workqueue;
  54 
  55 static void vtpm_proxy_delete_device(struct proxy_dev *proxy_dev);
  56 
  57 /*
  58  * Functions related to 'server side'
  59  */
  60 
  61 /**
  62  * vtpm_proxy_fops_read - Read TPM commands on 'server side'
  63  *
  64  * @filp: file pointer
  65  * @buf: read buffer
  66  * @count: number of bytes to read
  67  * @off: offset
  68  *
  69  * Return:
  70  *      Number of bytes read or negative error code
  71  */
  72 static ssize_t vtpm_proxy_fops_read(struct file *filp, char __user *buf,
  73                                     size_t count, loff_t *off)
  74 {
  75         struct proxy_dev *proxy_dev = filp->private_data;
  76         size_t len;
  77         int sig, rc;
  78 
  79         sig = wait_event_interruptible(proxy_dev->wq,
  80                 proxy_dev->req_len != 0 ||
  81                 !(proxy_dev->state & STATE_OPENED_FLAG));
  82         if (sig)
  83                 return -EINTR;
  84 
  85         mutex_lock(&proxy_dev->buf_lock);
  86 
  87         if (!(proxy_dev->state & STATE_OPENED_FLAG)) {
  88                 mutex_unlock(&proxy_dev->buf_lock);
  89                 return -EPIPE;
  90         }
  91 
  92         len = proxy_dev->req_len;
  93 
  94         if (count < len) {
  95                 mutex_unlock(&proxy_dev->buf_lock);
  96                 pr_debug("Invalid size in recv: count=%zd, req_len=%zd\n",
  97                          count, len);
  98                 return -EIO;
  99         }
 100 
 101         rc = copy_to_user(buf, proxy_dev->buffer, len);
 102         memset(proxy_dev->buffer, 0, len);
 103         proxy_dev->req_len = 0;
 104 
 105         if (!rc)
 106                 proxy_dev->state |= STATE_WAIT_RESPONSE_FLAG;
 107 
 108         mutex_unlock(&proxy_dev->buf_lock);
 109 
 110         if (rc)
 111                 return -EFAULT;
 112 
 113         return len;
 114 }
 115 
 116 /**
 117  * vtpm_proxy_fops_write - Write TPM responses on 'server side'
 118  *
 119  * @filp: file pointer
 120  * @buf: write buffer
 121  * @count: number of bytes to write
 122  * @off: offset
 123  *
 124  * Return:
 125  *      Number of bytes read or negative error value
 126  */
 127 static ssize_t vtpm_proxy_fops_write(struct file *filp, const char __user *buf,
 128                                      size_t count, loff_t *off)
 129 {
 130         struct proxy_dev *proxy_dev = filp->private_data;
 131 
 132         mutex_lock(&proxy_dev->buf_lock);
 133 
 134         if (!(proxy_dev->state & STATE_OPENED_FLAG)) {
 135                 mutex_unlock(&proxy_dev->buf_lock);
 136                 return -EPIPE;
 137         }
 138 
 139         if (count > sizeof(proxy_dev->buffer) ||
 140             !(proxy_dev->state & STATE_WAIT_RESPONSE_FLAG)) {
 141                 mutex_unlock(&proxy_dev->buf_lock);
 142                 return -EIO;
 143         }
 144 
 145         proxy_dev->state &= ~STATE_WAIT_RESPONSE_FLAG;
 146 
 147         proxy_dev->req_len = 0;
 148 
 149         if (copy_from_user(proxy_dev->buffer, buf, count)) {
 150                 mutex_unlock(&proxy_dev->buf_lock);
 151                 return -EFAULT;
 152         }
 153 
 154         proxy_dev->resp_len = count;
 155 
 156         mutex_unlock(&proxy_dev->buf_lock);
 157 
 158         wake_up_interruptible(&proxy_dev->wq);
 159 
 160         return count;
 161 }
 162 
 163 /*
 164  * vtpm_proxy_fops_poll - Poll status on 'server side'
 165  *
 166  * @filp: file pointer
 167  * @wait: poll table
 168  *
 169  * Return: Poll flags
 170  */
 171 static __poll_t vtpm_proxy_fops_poll(struct file *filp, poll_table *wait)
 172 {
 173         struct proxy_dev *proxy_dev = filp->private_data;
 174         __poll_t ret;
 175 
 176         poll_wait(filp, &proxy_dev->wq, wait);
 177 
 178         ret = EPOLLOUT;
 179 
 180         mutex_lock(&proxy_dev->buf_lock);
 181 
 182         if (proxy_dev->req_len)
 183                 ret |= EPOLLIN | EPOLLRDNORM;
 184 
 185         if (!(proxy_dev->state & STATE_OPENED_FLAG))
 186                 ret |= EPOLLHUP;
 187 
 188         mutex_unlock(&proxy_dev->buf_lock);
 189 
 190         return ret;
 191 }
 192 
 193 /*
 194  * vtpm_proxy_fops_open - Open vTPM device on 'server side'
 195  *
 196  * @filp: file pointer
 197  *
 198  * Called when setting up the anonymous file descriptor
 199  */
 200 static void vtpm_proxy_fops_open(struct file *filp)
 201 {
 202         struct proxy_dev *proxy_dev = filp->private_data;
 203 
 204         proxy_dev->state |= STATE_OPENED_FLAG;
 205 }
 206 
 207 /**
 208  * vtpm_proxy_fops_undo_open - counter-part to vtpm_fops_open
 209  *       Call to undo vtpm_proxy_fops_open
 210  *
 211  *@proxy_dev: tpm proxy device
 212  */
 213 static void vtpm_proxy_fops_undo_open(struct proxy_dev *proxy_dev)
 214 {
 215         mutex_lock(&proxy_dev->buf_lock);
 216 
 217         proxy_dev->state &= ~STATE_OPENED_FLAG;
 218 
 219         mutex_unlock(&proxy_dev->buf_lock);
 220 
 221         /* no more TPM responses -- wake up anyone waiting for them */
 222         wake_up_interruptible(&proxy_dev->wq);
 223 }
 224 
 225 /*
 226  * vtpm_proxy_fops_release - Close 'server side'
 227  *
 228  * @inode: inode
 229  * @filp: file pointer
 230  * Return:
 231  *      Always returns 0.
 232  */
 233 static int vtpm_proxy_fops_release(struct inode *inode, struct file *filp)
 234 {
 235         struct proxy_dev *proxy_dev = filp->private_data;
 236 
 237         filp->private_data = NULL;
 238 
 239         vtpm_proxy_delete_device(proxy_dev);
 240 
 241         return 0;
 242 }
 243 
 244 static const struct file_operations vtpm_proxy_fops = {
 245         .owner = THIS_MODULE,
 246         .llseek = no_llseek,
 247         .read = vtpm_proxy_fops_read,
 248         .write = vtpm_proxy_fops_write,
 249         .poll = vtpm_proxy_fops_poll,
 250         .release = vtpm_proxy_fops_release,
 251 };
 252 
 253 /*
 254  * Functions invoked by the core TPM driver to send TPM commands to
 255  * 'server side' and receive responses from there.
 256  */
 257 
 258 /*
 259  * Called when core TPM driver reads TPM responses from 'server side'
 260  *
 261  * @chip: tpm chip to use
 262  * @buf: receive buffer
 263  * @count: bytes to read
 264  * Return:
 265  *      Number of TPM response bytes read, negative error value otherwise
 266  */
 267 static int vtpm_proxy_tpm_op_recv(struct tpm_chip *chip, u8 *buf, size_t count)
 268 {
 269         struct proxy_dev *proxy_dev = dev_get_drvdata(&chip->dev);
 270         size_t len;
 271 
 272         /* process gone ? */
 273         mutex_lock(&proxy_dev->buf_lock);
 274 
 275         if (!(proxy_dev->state & STATE_OPENED_FLAG)) {
 276                 mutex_unlock(&proxy_dev->buf_lock);
 277                 return -EPIPE;
 278         }
 279 
 280         len = proxy_dev->resp_len;
 281         if (count < len) {
 282                 dev_err(&chip->dev,
 283                         "Invalid size in recv: count=%zd, resp_len=%zd\n",
 284                         count, len);
 285                 len = -EIO;
 286                 goto out;
 287         }
 288 
 289         memcpy(buf, proxy_dev->buffer, len);
 290         proxy_dev->resp_len = 0;
 291 
 292 out:
 293         mutex_unlock(&proxy_dev->buf_lock);
 294 
 295         return len;
 296 }
 297 
 298 static int vtpm_proxy_is_driver_command(struct tpm_chip *chip,
 299                                         u8 *buf, size_t count)
 300 {
 301         struct tpm_header *hdr = (struct tpm_header *)buf;
 302 
 303         if (count < sizeof(struct tpm_header))
 304                 return 0;
 305 
 306         if (chip->flags & TPM_CHIP_FLAG_TPM2) {
 307                 switch (be32_to_cpu(hdr->ordinal)) {
 308                 case TPM2_CC_SET_LOCALITY:
 309                         return 1;
 310                 }
 311         } else {
 312                 switch (be32_to_cpu(hdr->ordinal)) {
 313                 case TPM_ORD_SET_LOCALITY:
 314                         return 1;
 315                 }
 316         }
 317         return 0;
 318 }
 319 
 320 /*
 321  * Called when core TPM driver forwards TPM requests to 'server side'.
 322  *
 323  * @chip: tpm chip to use
 324  * @buf: send buffer
 325  * @count: bytes to send
 326  *
 327  * Return:
 328  *      0 in case of success, negative error value otherwise.
 329  */
 330 static int vtpm_proxy_tpm_op_send(struct tpm_chip *chip, u8 *buf, size_t count)
 331 {
 332         struct proxy_dev *proxy_dev = dev_get_drvdata(&chip->dev);
 333 
 334         if (count > sizeof(proxy_dev->buffer)) {
 335                 dev_err(&chip->dev,
 336                         "Invalid size in send: count=%zd, buffer size=%zd\n",
 337                         count, sizeof(proxy_dev->buffer));
 338                 return -EIO;
 339         }
 340 
 341         if (!(proxy_dev->state & STATE_DRIVER_COMMAND) &&
 342             vtpm_proxy_is_driver_command(chip, buf, count))
 343                 return -EFAULT;
 344 
 345         mutex_lock(&proxy_dev->buf_lock);
 346 
 347         if (!(proxy_dev->state & STATE_OPENED_FLAG)) {
 348                 mutex_unlock(&proxy_dev->buf_lock);
 349                 return -EPIPE;
 350         }
 351 
 352         proxy_dev->resp_len = 0;
 353 
 354         proxy_dev->req_len = count;
 355         memcpy(proxy_dev->buffer, buf, count);
 356 
 357         proxy_dev->state &= ~STATE_WAIT_RESPONSE_FLAG;
 358 
 359         mutex_unlock(&proxy_dev->buf_lock);
 360 
 361         wake_up_interruptible(&proxy_dev->wq);
 362 
 363         return 0;
 364 }
 365 
 366 static void vtpm_proxy_tpm_op_cancel(struct tpm_chip *chip)
 367 {
 368         /* not supported */
 369 }
 370 
 371 static u8 vtpm_proxy_tpm_op_status(struct tpm_chip *chip)
 372 {
 373         struct proxy_dev *proxy_dev = dev_get_drvdata(&chip->dev);
 374 
 375         if (proxy_dev->resp_len)
 376                 return VTPM_PROXY_REQ_COMPLETE_FLAG;
 377 
 378         return 0;
 379 }
 380 
 381 static bool vtpm_proxy_tpm_req_canceled(struct tpm_chip  *chip, u8 status)
 382 {
 383         struct proxy_dev *proxy_dev = dev_get_drvdata(&chip->dev);
 384         bool ret;
 385 
 386         mutex_lock(&proxy_dev->buf_lock);
 387 
 388         ret = !(proxy_dev->state & STATE_OPENED_FLAG);
 389 
 390         mutex_unlock(&proxy_dev->buf_lock);
 391 
 392         return ret;
 393 }
 394 
 395 static int vtpm_proxy_request_locality(struct tpm_chip *chip, int locality)
 396 {
 397         struct tpm_buf buf;
 398         int rc;
 399         const struct tpm_header *header;
 400         struct proxy_dev *proxy_dev = dev_get_drvdata(&chip->dev);
 401 
 402         if (chip->flags & TPM_CHIP_FLAG_TPM2)
 403                 rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS,
 404                                   TPM2_CC_SET_LOCALITY);
 405         else
 406                 rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND,
 407                                   TPM_ORD_SET_LOCALITY);
 408         if (rc)
 409                 return rc;
 410         tpm_buf_append_u8(&buf, locality);
 411 
 412         proxy_dev->state |= STATE_DRIVER_COMMAND;
 413 
 414         rc = tpm_transmit_cmd(chip, &buf, 0, "attempting to set locality");
 415 
 416         proxy_dev->state &= ~STATE_DRIVER_COMMAND;
 417 
 418         if (rc < 0) {
 419                 locality = rc;
 420                 goto out;
 421         }
 422 
 423         header = (const struct tpm_header *)buf.data;
 424         rc = be32_to_cpu(header->return_code);
 425         if (rc)
 426                 locality = -1;
 427 
 428 out:
 429         tpm_buf_destroy(&buf);
 430 
 431         return locality;
 432 }
 433 
 434 static const struct tpm_class_ops vtpm_proxy_tpm_ops = {
 435         .flags = TPM_OPS_AUTO_STARTUP,
 436         .recv = vtpm_proxy_tpm_op_recv,
 437         .send = vtpm_proxy_tpm_op_send,
 438         .cancel = vtpm_proxy_tpm_op_cancel,
 439         .status = vtpm_proxy_tpm_op_status,
 440         .req_complete_mask = VTPM_PROXY_REQ_COMPLETE_FLAG,
 441         .req_complete_val = VTPM_PROXY_REQ_COMPLETE_FLAG,
 442         .req_canceled = vtpm_proxy_tpm_req_canceled,
 443         .request_locality = vtpm_proxy_request_locality,
 444 };
 445 
 446 /*
 447  * Code related to the startup of the TPM 2 and startup of TPM 1.2 +
 448  * retrieval of timeouts and durations.
 449  */
 450 
 451 static void vtpm_proxy_work(struct work_struct *work)
 452 {
 453         struct proxy_dev *proxy_dev = container_of(work, struct proxy_dev,
 454                                                    work);
 455         int rc;
 456 
 457         rc = tpm_chip_register(proxy_dev->chip);
 458         if (rc)
 459                 vtpm_proxy_fops_undo_open(proxy_dev);
 460         else
 461                 proxy_dev->state |= STATE_REGISTERED_FLAG;
 462 }
 463 
 464 /*
 465  * vtpm_proxy_work_stop: make sure the work has finished
 466  *
 467  * This function is useful when user space closed the fd
 468  * while the driver still determines timeouts.
 469  */
 470 static void vtpm_proxy_work_stop(struct proxy_dev *proxy_dev)
 471 {
 472         vtpm_proxy_fops_undo_open(proxy_dev);
 473         flush_work(&proxy_dev->work);
 474 }
 475 
 476 /*
 477  * vtpm_proxy_work_start: Schedule the work for TPM 1.2 & 2 initialization
 478  */
 479 static inline void vtpm_proxy_work_start(struct proxy_dev *proxy_dev)
 480 {
 481         queue_work(workqueue, &proxy_dev->work);
 482 }
 483 
 484 /*
 485  * Code related to creation and deletion of device pairs
 486  */
 487 static struct proxy_dev *vtpm_proxy_create_proxy_dev(void)
 488 {
 489         struct proxy_dev *proxy_dev;
 490         struct tpm_chip *chip;
 491         int err;
 492 
 493         proxy_dev = kzalloc(sizeof(*proxy_dev), GFP_KERNEL);
 494         if (proxy_dev == NULL)
 495                 return ERR_PTR(-ENOMEM);
 496 
 497         init_waitqueue_head(&proxy_dev->wq);
 498         mutex_init(&proxy_dev->buf_lock);
 499         INIT_WORK(&proxy_dev->work, vtpm_proxy_work);
 500 
 501         chip = tpm_chip_alloc(NULL, &vtpm_proxy_tpm_ops);
 502         if (IS_ERR(chip)) {
 503                 err = PTR_ERR(chip);
 504                 goto err_proxy_dev_free;
 505         }
 506         dev_set_drvdata(&chip->dev, proxy_dev);
 507 
 508         proxy_dev->chip = chip;
 509 
 510         return proxy_dev;
 511 
 512 err_proxy_dev_free:
 513         kfree(proxy_dev);
 514 
 515         return ERR_PTR(err);
 516 }
 517 
 518 /*
 519  * Undo what has been done in vtpm_create_proxy_dev
 520  */
 521 static inline void vtpm_proxy_delete_proxy_dev(struct proxy_dev *proxy_dev)
 522 {
 523         put_device(&proxy_dev->chip->dev); /* frees chip */
 524         kfree(proxy_dev);
 525 }
 526 
 527 /*
 528  * Create a /dev/tpm%d and 'server side' file descriptor pair
 529  *
 530  * Return:
 531  *      Returns file pointer on success, an error value otherwise
 532  */
 533 static struct file *vtpm_proxy_create_device(
 534                                  struct vtpm_proxy_new_dev *vtpm_new_dev)
 535 {
 536         struct proxy_dev *proxy_dev;
 537         int rc, fd;
 538         struct file *file;
 539 
 540         if (vtpm_new_dev->flags & ~VTPM_PROXY_FLAGS_ALL)
 541                 return ERR_PTR(-EOPNOTSUPP);
 542 
 543         proxy_dev = vtpm_proxy_create_proxy_dev();
 544         if (IS_ERR(proxy_dev))
 545                 return ERR_CAST(proxy_dev);
 546 
 547         proxy_dev->flags = vtpm_new_dev->flags;
 548 
 549         /* setup an anonymous file for the server-side */
 550         fd = get_unused_fd_flags(O_RDWR);
 551         if (fd < 0) {
 552                 rc = fd;
 553                 goto err_delete_proxy_dev;
 554         }
 555 
 556         file = anon_inode_getfile("[vtpms]", &vtpm_proxy_fops, proxy_dev,
 557                                   O_RDWR);
 558         if (IS_ERR(file)) {
 559                 rc = PTR_ERR(file);
 560                 goto err_put_unused_fd;
 561         }
 562 
 563         /* from now on we can unwind with put_unused_fd() + fput() */
 564         /* simulate an open() on the server side */
 565         vtpm_proxy_fops_open(file);
 566 
 567         if (proxy_dev->flags & VTPM_PROXY_FLAG_TPM2)
 568                 proxy_dev->chip->flags |= TPM_CHIP_FLAG_TPM2;
 569 
 570         vtpm_proxy_work_start(proxy_dev);
 571 
 572         vtpm_new_dev->fd = fd;
 573         vtpm_new_dev->major = MAJOR(proxy_dev->chip->dev.devt);
 574         vtpm_new_dev->minor = MINOR(proxy_dev->chip->dev.devt);
 575         vtpm_new_dev->tpm_num = proxy_dev->chip->dev_num;
 576 
 577         return file;
 578 
 579 err_put_unused_fd:
 580         put_unused_fd(fd);
 581 
 582 err_delete_proxy_dev:
 583         vtpm_proxy_delete_proxy_dev(proxy_dev);
 584 
 585         return ERR_PTR(rc);
 586 }
 587 
 588 /*
 589  * Counter part to vtpm_create_device.
 590  */
 591 static void vtpm_proxy_delete_device(struct proxy_dev *proxy_dev)
 592 {
 593         vtpm_proxy_work_stop(proxy_dev);
 594 
 595         /*
 596          * A client may hold the 'ops' lock, so let it know that the server
 597          * side shuts down before we try to grab the 'ops' lock when
 598          * unregistering the chip.
 599          */
 600         vtpm_proxy_fops_undo_open(proxy_dev);
 601 
 602         if (proxy_dev->state & STATE_REGISTERED_FLAG)
 603                 tpm_chip_unregister(proxy_dev->chip);
 604 
 605         vtpm_proxy_delete_proxy_dev(proxy_dev);
 606 }
 607 
 608 /*
 609  * Code related to the control device /dev/vtpmx
 610  */
 611 
 612 /**
 613  * vtpmx_ioc_new_dev - handler for the %VTPM_PROXY_IOC_NEW_DEV ioctl
 614  * @file:       /dev/vtpmx
 615  * @ioctl:      the ioctl number
 616  * @arg:        pointer to the struct vtpmx_proxy_new_dev
 617  *
 618  * Creates an anonymous file that is used by the process acting as a TPM to
 619  * communicate with the client processes. The function will also add a new TPM
 620  * device through which data is proxied to this TPM acting process. The caller
 621  * will be provided with a file descriptor to communicate with the clients and
 622  * major and minor numbers for the TPM device.
 623  */
 624 static long vtpmx_ioc_new_dev(struct file *file, unsigned int ioctl,
 625                               unsigned long arg)
 626 {
 627         void __user *argp = (void __user *)arg;
 628         struct vtpm_proxy_new_dev __user *vtpm_new_dev_p;
 629         struct vtpm_proxy_new_dev vtpm_new_dev;
 630         struct file *vtpm_file;
 631 
 632         if (!capable(CAP_SYS_ADMIN))
 633                 return -EPERM;
 634 
 635         vtpm_new_dev_p = argp;
 636 
 637         if (copy_from_user(&vtpm_new_dev, vtpm_new_dev_p,
 638                            sizeof(vtpm_new_dev)))
 639                 return -EFAULT;
 640 
 641         vtpm_file = vtpm_proxy_create_device(&vtpm_new_dev);
 642         if (IS_ERR(vtpm_file))
 643                 return PTR_ERR(vtpm_file);
 644 
 645         if (copy_to_user(vtpm_new_dev_p, &vtpm_new_dev,
 646                          sizeof(vtpm_new_dev))) {
 647                 put_unused_fd(vtpm_new_dev.fd);
 648                 fput(vtpm_file);
 649                 return -EFAULT;
 650         }
 651 
 652         fd_install(vtpm_new_dev.fd, vtpm_file);
 653         return 0;
 654 }
 655 
 656 /*
 657  * vtpmx_fops_ioctl: ioctl on /dev/vtpmx
 658  *
 659  * Return:
 660  *      Returns 0 on success, a negative error code otherwise.
 661  */
 662 static long vtpmx_fops_ioctl(struct file *f, unsigned int ioctl,
 663                              unsigned long arg)
 664 {
 665         switch (ioctl) {
 666         case VTPM_PROXY_IOC_NEW_DEV:
 667                 return vtpmx_ioc_new_dev(f, ioctl, arg);
 668         default:
 669                 return -ENOIOCTLCMD;
 670         }
 671 }
 672 
 673 #ifdef CONFIG_COMPAT
 674 static long vtpmx_fops_compat_ioctl(struct file *f, unsigned int ioctl,
 675                                           unsigned long arg)
 676 {
 677         return vtpmx_fops_ioctl(f, ioctl, (unsigned long)compat_ptr(arg));
 678 }
 679 #endif
 680 
 681 static const struct file_operations vtpmx_fops = {
 682         .owner = THIS_MODULE,
 683         .unlocked_ioctl = vtpmx_fops_ioctl,
 684 #ifdef CONFIG_COMPAT
 685         .compat_ioctl = vtpmx_fops_compat_ioctl,
 686 #endif
 687         .llseek = noop_llseek,
 688 };
 689 
 690 static struct miscdevice vtpmx_miscdev = {
 691         .minor = MISC_DYNAMIC_MINOR,
 692         .name = "vtpmx",
 693         .fops = &vtpmx_fops,
 694 };
 695 
 696 static int vtpmx_init(void)
 697 {
 698         return misc_register(&vtpmx_miscdev);
 699 }
 700 
 701 static void vtpmx_cleanup(void)
 702 {
 703         misc_deregister(&vtpmx_miscdev);
 704 }
 705 
 706 static int __init vtpm_module_init(void)
 707 {
 708         int rc;
 709 
 710         rc = vtpmx_init();
 711         if (rc) {
 712                 pr_err("couldn't create vtpmx device\n");
 713                 return rc;
 714         }
 715 
 716         workqueue = create_workqueue("tpm-vtpm");
 717         if (!workqueue) {
 718                 pr_err("couldn't create workqueue\n");
 719                 rc = -ENOMEM;
 720                 goto err_vtpmx_cleanup;
 721         }
 722 
 723         return 0;
 724 
 725 err_vtpmx_cleanup:
 726         vtpmx_cleanup();
 727 
 728         return rc;
 729 }
 730 
 731 static void __exit vtpm_module_exit(void)
 732 {
 733         destroy_workqueue(workqueue);
 734         vtpmx_cleanup();
 735 }
 736 
 737 module_init(vtpm_module_init);
 738 module_exit(vtpm_module_exit);
 739 
 740 MODULE_AUTHOR("Stefan Berger (stefanb@us.ibm.com)");
 741 MODULE_DESCRIPTION("vTPM Driver");
 742 MODULE_VERSION("0.1");
 743 MODULE_LICENSE("GPL");