Stefan Berger | 6f99612 | 2016-04-18 13:26:15 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2015, 2016 IBM Corporation |
| 3 | * |
| 4 | * Author: Stefan Berger <stefanb@us.ibm.com> |
| 5 | * |
| 6 | * Maintained by: <tpmdd-devel@lists.sourceforge.net> |
| 7 | * |
| 8 | * Device driver for vTPM (vTPM proxy driver) |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or |
| 11 | * modify it under the terms of the GNU General Public License as |
| 12 | * published by the Free Software Foundation, version 2 of the |
| 13 | * License. |
| 14 | * |
| 15 | */ |
| 16 | |
| 17 | #include <linux/types.h> |
| 18 | #include <linux/spinlock.h> |
| 19 | #include <linux/uaccess.h> |
| 20 | #include <linux/wait.h> |
| 21 | #include <linux/miscdevice.h> |
| 22 | #include <linux/vtpm_proxy.h> |
| 23 | #include <linux/file.h> |
| 24 | #include <linux/anon_inodes.h> |
| 25 | #include <linux/poll.h> |
| 26 | #include <linux/compat.h> |
| 27 | |
| 28 | #include "tpm.h" |
| 29 | |
| 30 | #define VTPM_PROXY_REQ_COMPLETE_FLAG BIT(0) |
| 31 | |
| 32 | struct proxy_dev { |
| 33 | struct tpm_chip *chip; |
| 34 | |
| 35 | u32 flags; /* public API flags */ |
| 36 | |
| 37 | wait_queue_head_t wq; |
| 38 | |
| 39 | struct mutex buf_lock; /* protect buffer and flags */ |
| 40 | |
| 41 | long state; /* internal state */ |
| 42 | #define STATE_OPENED_FLAG BIT(0) |
| 43 | #define STATE_WAIT_RESPONSE_FLAG BIT(1) /* waiting for emulator response */ |
| 44 | |
| 45 | size_t req_len; /* length of queued TPM request */ |
| 46 | size_t resp_len; /* length of queued TPM response */ |
| 47 | u8 buffer[TPM_BUFSIZE]; /* request/response buffer */ |
| 48 | |
| 49 | struct work_struct work; /* task that retrieves TPM timeouts */ |
| 50 | }; |
| 51 | |
| 52 | /* all supported flags */ |
| 53 | #define VTPM_PROXY_FLAGS_ALL (VTPM_PROXY_FLAG_TPM2) |
| 54 | |
| 55 | static struct workqueue_struct *workqueue; |
| 56 | |
| 57 | static void vtpm_proxy_delete_device(struct proxy_dev *proxy_dev); |
| 58 | |
| 59 | /* |
| 60 | * Functions related to 'server side' |
| 61 | */ |
| 62 | |
| 63 | /** |
| 64 | * vtpm_proxy_fops_read - Read TPM commands on 'server side' |
| 65 | * |
| 66 | * Return value: |
| 67 | * Number of bytes read or negative error code |
| 68 | */ |
| 69 | static ssize_t vtpm_proxy_fops_read(struct file *filp, char __user *buf, |
| 70 | size_t count, loff_t *off) |
| 71 | { |
| 72 | struct proxy_dev *proxy_dev = filp->private_data; |
| 73 | size_t len; |
| 74 | int sig, rc; |
| 75 | |
| 76 | sig = wait_event_interruptible(proxy_dev->wq, |
| 77 | proxy_dev->req_len != 0 || |
| 78 | !(proxy_dev->state & STATE_OPENED_FLAG)); |
| 79 | if (sig) |
| 80 | return -EINTR; |
| 81 | |
| 82 | mutex_lock(&proxy_dev->buf_lock); |
| 83 | |
| 84 | if (!(proxy_dev->state & STATE_OPENED_FLAG)) { |
| 85 | mutex_unlock(&proxy_dev->buf_lock); |
| 86 | return -EPIPE; |
| 87 | } |
| 88 | |
| 89 | len = proxy_dev->req_len; |
| 90 | |
| 91 | if (count < len) { |
| 92 | mutex_unlock(&proxy_dev->buf_lock); |
| 93 | pr_debug("Invalid size in recv: count=%zd, req_len=%zd\n", |
| 94 | count, len); |
| 95 | return -EIO; |
| 96 | } |
| 97 | |
| 98 | rc = copy_to_user(buf, proxy_dev->buffer, len); |
| 99 | memset(proxy_dev->buffer, 0, len); |
| 100 | proxy_dev->req_len = 0; |
| 101 | |
| 102 | if (!rc) |
| 103 | proxy_dev->state |= STATE_WAIT_RESPONSE_FLAG; |
| 104 | |
| 105 | mutex_unlock(&proxy_dev->buf_lock); |
| 106 | |
| 107 | if (rc) |
| 108 | return -EFAULT; |
| 109 | |
| 110 | return len; |
| 111 | } |
| 112 | |
| 113 | /** |
| 114 | * vtpm_proxy_fops_write - Write TPM responses on 'server side' |
| 115 | * |
| 116 | * Return value: |
| 117 | * Number of bytes read or negative error value |
| 118 | */ |
| 119 | static ssize_t vtpm_proxy_fops_write(struct file *filp, const char __user *buf, |
| 120 | size_t count, loff_t *off) |
| 121 | { |
| 122 | struct proxy_dev *proxy_dev = filp->private_data; |
| 123 | |
| 124 | mutex_lock(&proxy_dev->buf_lock); |
| 125 | |
| 126 | if (!(proxy_dev->state & STATE_OPENED_FLAG)) { |
| 127 | mutex_unlock(&proxy_dev->buf_lock); |
| 128 | return -EPIPE; |
| 129 | } |
| 130 | |
| 131 | if (count > sizeof(proxy_dev->buffer) || |
| 132 | !(proxy_dev->state & STATE_WAIT_RESPONSE_FLAG)) { |
| 133 | mutex_unlock(&proxy_dev->buf_lock); |
| 134 | return -EIO; |
| 135 | } |
| 136 | |
| 137 | proxy_dev->state &= ~STATE_WAIT_RESPONSE_FLAG; |
| 138 | |
| 139 | proxy_dev->req_len = 0; |
| 140 | |
| 141 | if (copy_from_user(proxy_dev->buffer, buf, count)) { |
| 142 | mutex_unlock(&proxy_dev->buf_lock); |
| 143 | return -EFAULT; |
| 144 | } |
| 145 | |
| 146 | proxy_dev->resp_len = count; |
| 147 | |
| 148 | mutex_unlock(&proxy_dev->buf_lock); |
| 149 | |
| 150 | wake_up_interruptible(&proxy_dev->wq); |
| 151 | |
| 152 | return count; |
| 153 | } |
| 154 | |
| 155 | /* |
| 156 | * vtpm_proxy_fops_poll: Poll status on 'server side' |
| 157 | * |
| 158 | * Return value: |
| 159 | * Poll flags |
| 160 | */ |
| 161 | static unsigned int vtpm_proxy_fops_poll(struct file *filp, poll_table *wait) |
| 162 | { |
| 163 | struct proxy_dev *proxy_dev = filp->private_data; |
| 164 | unsigned ret; |
| 165 | |
| 166 | poll_wait(filp, &proxy_dev->wq, wait); |
| 167 | |
| 168 | ret = POLLOUT; |
| 169 | |
| 170 | mutex_lock(&proxy_dev->buf_lock); |
| 171 | |
| 172 | if (proxy_dev->req_len) |
| 173 | ret |= POLLIN | POLLRDNORM; |
| 174 | |
| 175 | if (!(proxy_dev->state & STATE_OPENED_FLAG)) |
| 176 | ret |= POLLHUP; |
| 177 | |
| 178 | mutex_unlock(&proxy_dev->buf_lock); |
| 179 | |
| 180 | return ret; |
| 181 | } |
| 182 | |
| 183 | /* |
| 184 | * vtpm_proxy_fops_open - Open vTPM device on 'server side' |
| 185 | * |
| 186 | * Called when setting up the anonymous file descriptor |
| 187 | */ |
| 188 | static void vtpm_proxy_fops_open(struct file *filp) |
| 189 | { |
| 190 | struct proxy_dev *proxy_dev = filp->private_data; |
| 191 | |
| 192 | proxy_dev->state |= STATE_OPENED_FLAG; |
| 193 | } |
| 194 | |
| 195 | /** |
| 196 | * vtpm_proxy_fops_undo_open - counter-part to vtpm_fops_open |
| 197 | * |
| 198 | * Call to undo vtpm_proxy_fops_open |
| 199 | */ |
| 200 | static void vtpm_proxy_fops_undo_open(struct proxy_dev *proxy_dev) |
| 201 | { |
| 202 | mutex_lock(&proxy_dev->buf_lock); |
| 203 | |
| 204 | proxy_dev->state &= ~STATE_OPENED_FLAG; |
| 205 | |
| 206 | mutex_unlock(&proxy_dev->buf_lock); |
| 207 | |
| 208 | /* no more TPM responses -- wake up anyone waiting for them */ |
| 209 | wake_up_interruptible(&proxy_dev->wq); |
| 210 | } |
| 211 | |
| 212 | /* |
| 213 | * vtpm_proxy_fops_release: Close 'server side' |
| 214 | * |
| 215 | * Return value: |
| 216 | * Always returns 0. |
| 217 | */ |
| 218 | static int vtpm_proxy_fops_release(struct inode *inode, struct file *filp) |
| 219 | { |
| 220 | struct proxy_dev *proxy_dev = filp->private_data; |
| 221 | |
| 222 | filp->private_data = NULL; |
| 223 | |
| 224 | vtpm_proxy_delete_device(proxy_dev); |
| 225 | |
| 226 | return 0; |
| 227 | } |
| 228 | |
| 229 | static const struct file_operations vtpm_proxy_fops = { |
| 230 | .owner = THIS_MODULE, |
| 231 | .llseek = no_llseek, |
| 232 | .read = vtpm_proxy_fops_read, |
| 233 | .write = vtpm_proxy_fops_write, |
| 234 | .poll = vtpm_proxy_fops_poll, |
| 235 | .release = vtpm_proxy_fops_release, |
| 236 | }; |
| 237 | |
| 238 | /* |
| 239 | * Functions invoked by the core TPM driver to send TPM commands to |
| 240 | * 'server side' and receive responses from there. |
| 241 | */ |
| 242 | |
| 243 | /* |
| 244 | * Called when core TPM driver reads TPM responses from 'server side' |
| 245 | * |
| 246 | * Return value: |
| 247 | * Number of TPM response bytes read, negative error value otherwise |
| 248 | */ |
| 249 | static int vtpm_proxy_tpm_op_recv(struct tpm_chip *chip, u8 *buf, size_t count) |
| 250 | { |
| 251 | struct proxy_dev *proxy_dev = dev_get_drvdata(&chip->dev); |
| 252 | size_t len; |
| 253 | |
| 254 | /* process gone ? */ |
| 255 | mutex_lock(&proxy_dev->buf_lock); |
| 256 | |
| 257 | if (!(proxy_dev->state & STATE_OPENED_FLAG)) { |
| 258 | mutex_unlock(&proxy_dev->buf_lock); |
| 259 | return -EPIPE; |
| 260 | } |
| 261 | |
| 262 | len = proxy_dev->resp_len; |
| 263 | if (count < len) { |
| 264 | dev_err(&chip->dev, |
| 265 | "Invalid size in recv: count=%zd, resp_len=%zd\n", |
| 266 | count, len); |
| 267 | len = -EIO; |
| 268 | goto out; |
| 269 | } |
| 270 | |
| 271 | memcpy(buf, proxy_dev->buffer, len); |
| 272 | proxy_dev->resp_len = 0; |
| 273 | |
| 274 | out: |
| 275 | mutex_unlock(&proxy_dev->buf_lock); |
| 276 | |
| 277 | return len; |
| 278 | } |
| 279 | |
| 280 | /* |
| 281 | * Called when core TPM driver forwards TPM requests to 'server side'. |
| 282 | * |
| 283 | * Return value: |
| 284 | * 0 in case of success, negative error value otherwise. |
| 285 | */ |
| 286 | static int vtpm_proxy_tpm_op_send(struct tpm_chip *chip, u8 *buf, size_t count) |
| 287 | { |
| 288 | struct proxy_dev *proxy_dev = dev_get_drvdata(&chip->dev); |
| 289 | int rc = 0; |
| 290 | |
| 291 | if (count > sizeof(proxy_dev->buffer)) { |
| 292 | dev_err(&chip->dev, |
| 293 | "Invalid size in send: count=%zd, buffer size=%zd\n", |
| 294 | count, sizeof(proxy_dev->buffer)); |
| 295 | return -EIO; |
| 296 | } |
| 297 | |
| 298 | mutex_lock(&proxy_dev->buf_lock); |
| 299 | |
| 300 | if (!(proxy_dev->state & STATE_OPENED_FLAG)) { |
| 301 | mutex_unlock(&proxy_dev->buf_lock); |
| 302 | return -EPIPE; |
| 303 | } |
| 304 | |
| 305 | proxy_dev->resp_len = 0; |
| 306 | |
| 307 | proxy_dev->req_len = count; |
| 308 | memcpy(proxy_dev->buffer, buf, count); |
| 309 | |
| 310 | proxy_dev->state &= ~STATE_WAIT_RESPONSE_FLAG; |
| 311 | |
| 312 | mutex_unlock(&proxy_dev->buf_lock); |
| 313 | |
| 314 | wake_up_interruptible(&proxy_dev->wq); |
| 315 | |
| 316 | return rc; |
| 317 | } |
| 318 | |
| 319 | static void vtpm_proxy_tpm_op_cancel(struct tpm_chip *chip) |
| 320 | { |
| 321 | /* not supported */ |
| 322 | } |
| 323 | |
| 324 | static u8 vtpm_proxy_tpm_op_status(struct tpm_chip *chip) |
| 325 | { |
| 326 | struct proxy_dev *proxy_dev = dev_get_drvdata(&chip->dev); |
| 327 | |
| 328 | if (proxy_dev->resp_len) |
| 329 | return VTPM_PROXY_REQ_COMPLETE_FLAG; |
| 330 | |
| 331 | return 0; |
| 332 | } |
| 333 | |
| 334 | static bool vtpm_proxy_tpm_req_canceled(struct tpm_chip *chip, u8 status) |
| 335 | { |
| 336 | struct proxy_dev *proxy_dev = dev_get_drvdata(&chip->dev); |
| 337 | bool ret; |
| 338 | |
| 339 | mutex_lock(&proxy_dev->buf_lock); |
| 340 | |
| 341 | ret = !(proxy_dev->state & STATE_OPENED_FLAG); |
| 342 | |
| 343 | mutex_unlock(&proxy_dev->buf_lock); |
| 344 | |
| 345 | return ret; |
| 346 | } |
| 347 | |
| 348 | static const struct tpm_class_ops vtpm_proxy_tpm_ops = { |
Jason Gunthorpe | cae8b44 | 2016-07-12 11:41:49 -0600 | [diff] [blame] | 349 | .flags = TPM_OPS_AUTO_STARTUP, |
Stefan Berger | 6f99612 | 2016-04-18 13:26:15 -0400 | [diff] [blame] | 350 | .recv = vtpm_proxy_tpm_op_recv, |
| 351 | .send = vtpm_proxy_tpm_op_send, |
| 352 | .cancel = vtpm_proxy_tpm_op_cancel, |
| 353 | .status = vtpm_proxy_tpm_op_status, |
| 354 | .req_complete_mask = VTPM_PROXY_REQ_COMPLETE_FLAG, |
| 355 | .req_complete_val = VTPM_PROXY_REQ_COMPLETE_FLAG, |
| 356 | .req_canceled = vtpm_proxy_tpm_req_canceled, |
| 357 | }; |
| 358 | |
| 359 | /* |
| 360 | * Code related to the startup of the TPM 2 and startup of TPM 1.2 + |
| 361 | * retrieval of timeouts and durations. |
| 362 | */ |
| 363 | |
| 364 | static void vtpm_proxy_work(struct work_struct *work) |
| 365 | { |
| 366 | struct proxy_dev *proxy_dev = container_of(work, struct proxy_dev, |
| 367 | work); |
| 368 | int rc; |
| 369 | |
Stefan Berger | 6f99612 | 2016-04-18 13:26:15 -0400 | [diff] [blame] | 370 | rc = tpm_chip_register(proxy_dev->chip); |
| 371 | if (rc) |
| 372 | goto err; |
| 373 | |
| 374 | return; |
| 375 | |
| 376 | err: |
| 377 | vtpm_proxy_fops_undo_open(proxy_dev); |
| 378 | } |
| 379 | |
| 380 | /* |
| 381 | * vtpm_proxy_work_stop: make sure the work has finished |
| 382 | * |
| 383 | * This function is useful when user space closed the fd |
| 384 | * while the driver still determines timeouts. |
| 385 | */ |
| 386 | static void vtpm_proxy_work_stop(struct proxy_dev *proxy_dev) |
| 387 | { |
| 388 | vtpm_proxy_fops_undo_open(proxy_dev); |
| 389 | flush_work(&proxy_dev->work); |
| 390 | } |
| 391 | |
| 392 | /* |
| 393 | * vtpm_proxy_work_start: Schedule the work for TPM 1.2 & 2 initialization |
| 394 | */ |
| 395 | static inline void vtpm_proxy_work_start(struct proxy_dev *proxy_dev) |
| 396 | { |
| 397 | queue_work(workqueue, &proxy_dev->work); |
| 398 | } |
| 399 | |
| 400 | /* |
| 401 | * Code related to creation and deletion of device pairs |
| 402 | */ |
| 403 | static struct proxy_dev *vtpm_proxy_create_proxy_dev(void) |
| 404 | { |
| 405 | struct proxy_dev *proxy_dev; |
| 406 | struct tpm_chip *chip; |
| 407 | int err; |
| 408 | |
| 409 | proxy_dev = kzalloc(sizeof(*proxy_dev), GFP_KERNEL); |
| 410 | if (proxy_dev == NULL) |
| 411 | return ERR_PTR(-ENOMEM); |
| 412 | |
| 413 | init_waitqueue_head(&proxy_dev->wq); |
| 414 | mutex_init(&proxy_dev->buf_lock); |
| 415 | INIT_WORK(&proxy_dev->work, vtpm_proxy_work); |
| 416 | |
| 417 | chip = tpm_chip_alloc(NULL, &vtpm_proxy_tpm_ops); |
| 418 | if (IS_ERR(chip)) { |
| 419 | err = PTR_ERR(chip); |
| 420 | goto err_proxy_dev_free; |
| 421 | } |
| 422 | dev_set_drvdata(&chip->dev, proxy_dev); |
| 423 | |
| 424 | proxy_dev->chip = chip; |
| 425 | |
| 426 | return proxy_dev; |
| 427 | |
| 428 | err_proxy_dev_free: |
| 429 | kfree(proxy_dev); |
| 430 | |
| 431 | return ERR_PTR(err); |
| 432 | } |
| 433 | |
| 434 | /* |
| 435 | * Undo what has been done in vtpm_create_proxy_dev |
| 436 | */ |
| 437 | static inline void vtpm_proxy_delete_proxy_dev(struct proxy_dev *proxy_dev) |
| 438 | { |
| 439 | put_device(&proxy_dev->chip->dev); /* frees chip */ |
| 440 | kfree(proxy_dev); |
| 441 | } |
| 442 | |
| 443 | /* |
| 444 | * Create a /dev/tpm%d and 'server side' file descriptor pair |
| 445 | * |
| 446 | * Return value: |
| 447 | * Returns file pointer on success, an error value otherwise |
| 448 | */ |
| 449 | static struct file *vtpm_proxy_create_device( |
| 450 | struct vtpm_proxy_new_dev *vtpm_new_dev) |
| 451 | { |
| 452 | struct proxy_dev *proxy_dev; |
| 453 | int rc, fd; |
| 454 | struct file *file; |
| 455 | |
| 456 | if (vtpm_new_dev->flags & ~VTPM_PROXY_FLAGS_ALL) |
| 457 | return ERR_PTR(-EOPNOTSUPP); |
| 458 | |
| 459 | proxy_dev = vtpm_proxy_create_proxy_dev(); |
| 460 | if (IS_ERR(proxy_dev)) |
| 461 | return ERR_CAST(proxy_dev); |
| 462 | |
| 463 | proxy_dev->flags = vtpm_new_dev->flags; |
| 464 | |
| 465 | /* setup an anonymous file for the server-side */ |
| 466 | fd = get_unused_fd_flags(O_RDWR); |
| 467 | if (fd < 0) { |
| 468 | rc = fd; |
| 469 | goto err_delete_proxy_dev; |
| 470 | } |
| 471 | |
| 472 | file = anon_inode_getfile("[vtpms]", &vtpm_proxy_fops, proxy_dev, |
| 473 | O_RDWR); |
| 474 | if (IS_ERR(file)) { |
| 475 | rc = PTR_ERR(file); |
| 476 | goto err_put_unused_fd; |
| 477 | } |
| 478 | |
| 479 | /* from now on we can unwind with put_unused_fd() + fput() */ |
| 480 | /* simulate an open() on the server side */ |
| 481 | vtpm_proxy_fops_open(file); |
| 482 | |
| 483 | if (proxy_dev->flags & VTPM_PROXY_FLAG_TPM2) |
| 484 | proxy_dev->chip->flags |= TPM_CHIP_FLAG_TPM2; |
| 485 | |
| 486 | vtpm_proxy_work_start(proxy_dev); |
| 487 | |
| 488 | vtpm_new_dev->fd = fd; |
| 489 | vtpm_new_dev->major = MAJOR(proxy_dev->chip->dev.devt); |
| 490 | vtpm_new_dev->minor = MINOR(proxy_dev->chip->dev.devt); |
| 491 | vtpm_new_dev->tpm_num = proxy_dev->chip->dev_num; |
| 492 | |
| 493 | return file; |
| 494 | |
| 495 | err_put_unused_fd: |
| 496 | put_unused_fd(fd); |
| 497 | |
| 498 | err_delete_proxy_dev: |
| 499 | vtpm_proxy_delete_proxy_dev(proxy_dev); |
| 500 | |
| 501 | return ERR_PTR(rc); |
| 502 | } |
| 503 | |
| 504 | /* |
| 505 | * Counter part to vtpm_create_device. |
| 506 | */ |
| 507 | static void vtpm_proxy_delete_device(struct proxy_dev *proxy_dev) |
| 508 | { |
| 509 | vtpm_proxy_work_stop(proxy_dev); |
| 510 | |
| 511 | /* |
| 512 | * A client may hold the 'ops' lock, so let it know that the server |
| 513 | * side shuts down before we try to grab the 'ops' lock when |
| 514 | * unregistering the chip. |
| 515 | */ |
| 516 | vtpm_proxy_fops_undo_open(proxy_dev); |
| 517 | |
| 518 | tpm_chip_unregister(proxy_dev->chip); |
| 519 | |
| 520 | vtpm_proxy_delete_proxy_dev(proxy_dev); |
| 521 | } |
| 522 | |
| 523 | /* |
| 524 | * Code related to the control device /dev/vtpmx |
| 525 | */ |
| 526 | |
| 527 | /* |
| 528 | * vtpmx_fops_ioctl: ioctl on /dev/vtpmx |
| 529 | * |
| 530 | * Return value: |
| 531 | * Returns 0 on success, a negative error code otherwise. |
| 532 | */ |
| 533 | static long vtpmx_fops_ioctl(struct file *f, unsigned int ioctl, |
| 534 | unsigned long arg) |
| 535 | { |
| 536 | void __user *argp = (void __user *)arg; |
Jarkko Sakkinen | 9da7e78 | 2016-06-17 16:39:28 +0200 | [diff] [blame] | 537 | struct vtpm_proxy_new_dev __user *vtpm_new_dev_p; |
Stefan Berger | 6f99612 | 2016-04-18 13:26:15 -0400 | [diff] [blame] | 538 | struct vtpm_proxy_new_dev vtpm_new_dev; |
| 539 | struct file *file; |
| 540 | |
| 541 | switch (ioctl) { |
| 542 | case VTPM_PROXY_IOC_NEW_DEV: |
| 543 | if (!capable(CAP_SYS_ADMIN)) |
| 544 | return -EPERM; |
| 545 | vtpm_new_dev_p = argp; |
| 546 | if (copy_from_user(&vtpm_new_dev, vtpm_new_dev_p, |
| 547 | sizeof(vtpm_new_dev))) |
| 548 | return -EFAULT; |
| 549 | file = vtpm_proxy_create_device(&vtpm_new_dev); |
| 550 | if (IS_ERR(file)) |
| 551 | return PTR_ERR(file); |
| 552 | if (copy_to_user(vtpm_new_dev_p, &vtpm_new_dev, |
| 553 | sizeof(vtpm_new_dev))) { |
| 554 | put_unused_fd(vtpm_new_dev.fd); |
| 555 | fput(file); |
| 556 | return -EFAULT; |
| 557 | } |
| 558 | |
| 559 | fd_install(vtpm_new_dev.fd, file); |
| 560 | return 0; |
| 561 | |
| 562 | default: |
| 563 | return -ENOIOCTLCMD; |
| 564 | } |
| 565 | } |
| 566 | |
| 567 | #ifdef CONFIG_COMPAT |
| 568 | static long vtpmx_fops_compat_ioctl(struct file *f, unsigned int ioctl, |
| 569 | unsigned long arg) |
| 570 | { |
| 571 | return vtpmx_fops_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); |
| 572 | } |
| 573 | #endif |
| 574 | |
| 575 | static const struct file_operations vtpmx_fops = { |
| 576 | .owner = THIS_MODULE, |
| 577 | .unlocked_ioctl = vtpmx_fops_ioctl, |
| 578 | #ifdef CONFIG_COMPAT |
| 579 | .compat_ioctl = vtpmx_fops_compat_ioctl, |
| 580 | #endif |
| 581 | .llseek = noop_llseek, |
| 582 | }; |
| 583 | |
| 584 | static struct miscdevice vtpmx_miscdev = { |
| 585 | .minor = MISC_DYNAMIC_MINOR, |
| 586 | .name = "vtpmx", |
| 587 | .fops = &vtpmx_fops, |
| 588 | }; |
| 589 | |
| 590 | static int vtpmx_init(void) |
| 591 | { |
| 592 | return misc_register(&vtpmx_miscdev); |
| 593 | } |
| 594 | |
| 595 | static void vtpmx_cleanup(void) |
| 596 | { |
| 597 | misc_deregister(&vtpmx_miscdev); |
| 598 | } |
| 599 | |
| 600 | static int __init vtpm_module_init(void) |
| 601 | { |
| 602 | int rc; |
| 603 | |
| 604 | rc = vtpmx_init(); |
| 605 | if (rc) { |
| 606 | pr_err("couldn't create vtpmx device\n"); |
| 607 | return rc; |
| 608 | } |
| 609 | |
| 610 | workqueue = create_workqueue("tpm-vtpm"); |
| 611 | if (!workqueue) { |
| 612 | pr_err("couldn't create workqueue\n"); |
| 613 | rc = -ENOMEM; |
| 614 | goto err_vtpmx_cleanup; |
| 615 | } |
| 616 | |
| 617 | return 0; |
| 618 | |
| 619 | err_vtpmx_cleanup: |
| 620 | vtpmx_cleanup(); |
| 621 | |
| 622 | return rc; |
| 623 | } |
| 624 | |
| 625 | static void __exit vtpm_module_exit(void) |
| 626 | { |
| 627 | destroy_workqueue(workqueue); |
| 628 | vtpmx_cleanup(); |
| 629 | } |
| 630 | |
| 631 | module_init(vtpm_module_init); |
| 632 | module_exit(vtpm_module_exit); |
| 633 | |
| 634 | MODULE_AUTHOR("Stefan Berger (stefanb@us.ibm.com)"); |
| 635 | MODULE_DESCRIPTION("vTPM Driver"); |
| 636 | MODULE_VERSION("0.1"); |
| 637 | MODULE_LICENSE("GPL"); |