1 /*****************************************************************************/ 2 3 /* 4 * devio.c -- User space communication with USB devices. 5 * 6 * Copyright (C) 1999-2000 Thomas Sailer (sailer@ife.ee.ethz.ch) 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 21 * 22 * This file implements the usbfs/x/y files, where 23 * x is the bus number and y the device number. 24 * 25 * It allows user space programs/"drivers" to communicate directly 26 * with USB devices without intervening kernel driver. 27 * 28 * Revision history 29 * 22.12.1999 0.1 Initial release (split from proc_usb.c) 30 * 04.01.2000 0.2 Turned into its own filesystem 31 * 30.09.2005 0.3 Fix user-triggerable oops in async URB delivery 32 * (CAN-2005-3055) 33 */ 34 35 /*****************************************************************************/ 36 37 #include <linux/fs.h> 38 #include <linux/mm.h> 39 #include <linux/slab.h> 40 #include <linux/signal.h> 41 #include <linux/poll.h> 42 #include <linux/module.h> 43 #include <linux/string.h> 44 #include <linux/usb.h> 45 #include <linux/usbdevice_fs.h> 46 #include <linux/usb/hcd.h> /* for usbcore internals */ 47 #include <linux/cdev.h> 48 #include <linux/notifier.h> 49 #include <linux/security.h> 50 #include <linux/user_namespace.h> 51 #include <linux/scatterlist.h> 52 #include <linux/uaccess.h> 53 #include <linux/dma-mapping.h> 54 #include <asm/byteorder.h> 55 #include <linux/moduleparam.h> 56 57 #include "usb.h" 58 59 #define USB_MAXBUS 64 60 #define USB_DEVICE_MAX (USB_MAXBUS * 128) 61 #define USB_SG_SIZE 16384 /* split-size for large txs */ 62 63 /* Mutual exclusion for removal, open, and release */ 64 DEFINE_MUTEX(usbfs_mutex); 65 66 struct usb_dev_state { 67 struct list_head list; /* state list */ 68 struct usb_device *dev; 69 struct file *file; 70 spinlock_t lock; /* protects the async urb lists */ 71 struct list_head async_pending; 72 struct list_head async_completed; 73 struct list_head memory_list; 74 wait_queue_head_t wait; /* wake up if a request completed */ 75 unsigned int discsignr; 76 struct pid *disc_pid; 77 const struct cred *cred; 78 void __user *disccontext; 79 unsigned long ifclaimed; 80 u32 secid; 81 u32 disabled_bulk_eps; 82 bool privileges_dropped; 83 unsigned long interface_allowed_mask; 84 }; 85 86 struct usb_memory { 87 struct list_head memlist; 88 int vma_use_count; 89 int urb_use_count; 90 u32 size; 91 void *mem; 92 dma_addr_t dma_handle; 93 unsigned long vm_start; 94 struct usb_dev_state *ps; 95 }; 96 97 struct async { 98 struct list_head asynclist; 99 struct usb_dev_state *ps; 100 struct pid *pid; 101 const struct cred *cred; 102 unsigned int signr; 103 unsigned int ifnum; 104 void __user *userbuffer; 105 void __user *userurb; 106 struct urb *urb; 107 struct usb_memory *usbm; 108 unsigned int mem_usage; 109 int status; 110 u32 secid; 111 u8 bulk_addr; 112 u8 bulk_status; 113 }; 114 115 static bool usbfs_snoop; 116 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR); 117 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic"); 118 119 static unsigned usbfs_snoop_max = 65536; 120 module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR); 121 MODULE_PARM_DESC(usbfs_snoop_max, 122 "maximum number of bytes to print while snooping"); 123 124 #define snoop(dev, format, arg...) \ 125 do { \ 126 if (usbfs_snoop) \ 127 dev_info(dev, format, ## arg); \ 128 } while (0) 129 130 enum snoop_when { 131 SUBMIT, COMPLETE 132 }; 133 134 #define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0) 135 136 /* Limit on the total amount of memory we can allocate for transfers */ 137 static unsigned usbfs_memory_mb = 16; 138 module_param(usbfs_memory_mb, uint, 0644); 139 MODULE_PARM_DESC(usbfs_memory_mb, 140 "maximum MB allowed for usbfs buffers (0 = no limit)"); 141 142 /* Hard limit, necessary to avoid arithmetic overflow */ 143 #define USBFS_XFER_MAX (UINT_MAX / 2 - 1000000) 144 145 static atomic_t usbfs_memory_usage; /* Total memory currently allocated */ 146 147 /* Check whether it's okay to allocate more memory for a transfer */ 148 static int usbfs_increase_memory_usage(unsigned amount) 149 { 150 unsigned lim; 151 152 /* 153 * Convert usbfs_memory_mb to bytes, avoiding overflows. 154 * 0 means use the hard limit (effectively unlimited). 155 */ 156 lim = ACCESS_ONCE(usbfs_memory_mb); 157 if (lim == 0 || lim > (USBFS_XFER_MAX >> 20)) 158 lim = USBFS_XFER_MAX; 159 else 160 lim <<= 20; 161 162 atomic_add(amount, &usbfs_memory_usage); 163 if (atomic_read(&usbfs_memory_usage) <= lim) 164 return 0; 165 atomic_sub(amount, &usbfs_memory_usage); 166 return -ENOMEM; 167 } 168 169 /* Memory for a transfer is being deallocated */ 170 static void usbfs_decrease_memory_usage(unsigned amount) 171 { 172 atomic_sub(amount, &usbfs_memory_usage); 173 } 174 175 static int connected(struct usb_dev_state *ps) 176 { 177 return (!list_empty(&ps->list) && 178 ps->dev->state != USB_STATE_NOTATTACHED); 179 } 180 181 static void dec_usb_memory_use_count(struct usb_memory *usbm, int *count) 182 { 183 struct usb_dev_state *ps = usbm->ps; 184 unsigned long flags; 185 186 spin_lock_irqsave(&ps->lock, flags); 187 --*count; 188 if (usbm->urb_use_count == 0 && usbm->vma_use_count == 0) { 189 list_del(&usbm->memlist); 190 spin_unlock_irqrestore(&ps->lock, flags); 191 192 usb_free_coherent(ps->dev, usbm->size, usbm->mem, 193 usbm->dma_handle); 194 usbfs_decrease_memory_usage( 195 usbm->size + sizeof(struct usb_memory)); 196 kfree(usbm); 197 } else { 198 spin_unlock_irqrestore(&ps->lock, flags); 199 } 200 } 201 202 static void usbdev_vm_open(struct vm_area_struct *vma) 203 { 204 struct usb_memory *usbm = vma->vm_private_data; 205 unsigned long flags; 206 207 spin_lock_irqsave(&usbm->ps->lock, flags); 208 ++usbm->vma_use_count; 209 spin_unlock_irqrestore(&usbm->ps->lock, flags); 210 } 211 212 static void usbdev_vm_close(struct vm_area_struct *vma) 213 { 214 struct usb_memory *usbm = vma->vm_private_data; 215 216 dec_usb_memory_use_count(usbm, &usbm->vma_use_count); 217 } 218 219 struct vm_operations_struct usbdev_vm_ops = { 220 .open = usbdev_vm_open, 221 .close = usbdev_vm_close 222 }; 223 224 static int usbdev_mmap(struct file *file, struct vm_area_struct *vma) 225 { 226 struct usb_memory *usbm = NULL; 227 struct usb_dev_state *ps = file->private_data; 228 size_t size = vma->vm_end - vma->vm_start; 229 void *mem; 230 unsigned long flags; 231 dma_addr_t dma_handle; 232 int ret; 233 234 ret = usbfs_increase_memory_usage(size + sizeof(struct usb_memory)); 235 if (ret) 236 goto error; 237 238 usbm = kzalloc(sizeof(struct usb_memory), GFP_KERNEL); 239 if (!usbm) { 240 ret = -ENOMEM; 241 goto error_decrease_mem; 242 } 243 244 mem = usb_alloc_coherent(ps->dev, size, GFP_USER, &dma_handle); 245 if (!mem) { 246 ret = -ENOMEM; 247 goto error_free_usbm; 248 } 249 250 memset(mem, 0, size); 251 252 usbm->mem = mem; 253 usbm->dma_handle = dma_handle; 254 usbm->size = size; 255 usbm->ps = ps; 256 usbm->vm_start = vma->vm_start; 257 usbm->vma_use_count = 1; 258 INIT_LIST_HEAD(&usbm->memlist); 259 260 if (remap_pfn_range(vma, vma->vm_start, 261 virt_to_phys(usbm->mem) >> PAGE_SHIFT, 262 size, vma->vm_page_prot) < 0) { 263 dec_usb_memory_use_count(usbm, &usbm->vma_use_count); 264 return -EAGAIN; 265 } 266 267 vma->vm_flags |= VM_IO; 268 vma->vm_flags |= (VM_DONTEXPAND | VM_DONTDUMP); 269 vma->vm_ops = &usbdev_vm_ops; 270 vma->vm_private_data = usbm; 271 272 spin_lock_irqsave(&ps->lock, flags); 273 list_add_tail(&usbm->memlist, &ps->memory_list); 274 spin_unlock_irqrestore(&ps->lock, flags); 275 276 return 0; 277 278 error_free_usbm: 279 kfree(usbm); 280 error_decrease_mem: 281 usbfs_decrease_memory_usage(size + sizeof(struct usb_memory)); 282 error: 283 return ret; 284 } 285 286 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes, 287 loff_t *ppos) 288 { 289 struct usb_dev_state *ps = file->private_data; 290 struct usb_device *dev = ps->dev; 291 ssize_t ret = 0; 292 unsigned len; 293 loff_t pos; 294 int i; 295 296 pos = *ppos; 297 usb_lock_device(dev); 298 if (!connected(ps)) { 299 ret = -ENODEV; 300 goto err; 301 } else if (pos < 0) { 302 ret = -EINVAL; 303 goto err; 304 } 305 306 if (pos < sizeof(struct usb_device_descriptor)) { 307 /* 18 bytes - fits on the stack */ 308 struct usb_device_descriptor temp_desc; 309 310 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor)); 311 le16_to_cpus(&temp_desc.bcdUSB); 312 le16_to_cpus(&temp_desc.idVendor); 313 le16_to_cpus(&temp_desc.idProduct); 314 le16_to_cpus(&temp_desc.bcdDevice); 315 316 len = sizeof(struct usb_device_descriptor) - pos; 317 if (len > nbytes) 318 len = nbytes; 319 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) { 320 ret = -EFAULT; 321 goto err; 322 } 323 324 *ppos += len; 325 buf += len; 326 nbytes -= len; 327 ret += len; 328 } 329 330 pos = sizeof(struct usb_device_descriptor); 331 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) { 332 struct usb_config_descriptor *config = 333 (struct usb_config_descriptor *)dev->rawdescriptors[i]; 334 unsigned int length = le16_to_cpu(config->wTotalLength); 335 336 if (*ppos < pos + length) { 337 338 /* The descriptor may claim to be longer than it 339 * really is. Here is the actual allocated length. */ 340 unsigned alloclen = 341 le16_to_cpu(dev->config[i].desc.wTotalLength); 342 343 len = length - (*ppos - pos); 344 if (len > nbytes) 345 len = nbytes; 346 347 /* Simply don't write (skip over) unallocated parts */ 348 if (alloclen > (*ppos - pos)) { 349 alloclen -= (*ppos - pos); 350 if (copy_to_user(buf, 351 dev->rawdescriptors[i] + (*ppos - pos), 352 min(len, alloclen))) { 353 ret = -EFAULT; 354 goto err; 355 } 356 } 357 358 *ppos += len; 359 buf += len; 360 nbytes -= len; 361 ret += len; 362 } 363 364 pos += length; 365 } 366 367 err: 368 usb_unlock_device(dev); 369 return ret; 370 } 371 372 /* 373 * async list handling 374 */ 375 376 static struct async *alloc_async(unsigned int numisoframes) 377 { 378 struct async *as; 379 380 as = kzalloc(sizeof(struct async), GFP_KERNEL); 381 if (!as) 382 return NULL; 383 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL); 384 if (!as->urb) { 385 kfree(as); 386 return NULL; 387 } 388 return as; 389 } 390 391 static void free_async(struct async *as) 392 { 393 int i; 394 395 put_pid(as->pid); 396 if (as->cred) 397 put_cred(as->cred); 398 for (i = 0; i < as->urb->num_sgs; i++) { 399 if (sg_page(&as->urb->sg[i])) 400 kfree(sg_virt(&as->urb->sg[i])); 401 } 402 403 kfree(as->urb->sg); 404 if (as->usbm == NULL) 405 kfree(as->urb->transfer_buffer); 406 else 407 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count); 408 409 kfree(as->urb->setup_packet); 410 usb_free_urb(as->urb); 411 usbfs_decrease_memory_usage(as->mem_usage); 412 kfree(as); 413 } 414 415 static void async_newpending(struct async *as) 416 { 417 struct usb_dev_state *ps = as->ps; 418 unsigned long flags; 419 420 spin_lock_irqsave(&ps->lock, flags); 421 list_add_tail(&as->asynclist, &ps->async_pending); 422 spin_unlock_irqrestore(&ps->lock, flags); 423 } 424 425 static void async_removepending(struct async *as) 426 { 427 struct usb_dev_state *ps = as->ps; 428 unsigned long flags; 429 430 spin_lock_irqsave(&ps->lock, flags); 431 list_del_init(&as->asynclist); 432 spin_unlock_irqrestore(&ps->lock, flags); 433 } 434 435 static struct async *async_getcompleted(struct usb_dev_state *ps) 436 { 437 unsigned long flags; 438 struct async *as = NULL; 439 440 spin_lock_irqsave(&ps->lock, flags); 441 if (!list_empty(&ps->async_completed)) { 442 as = list_entry(ps->async_completed.next, struct async, 443 asynclist); 444 list_del_init(&as->asynclist); 445 } 446 spin_unlock_irqrestore(&ps->lock, flags); 447 return as; 448 } 449 450 static struct async *async_getpending(struct usb_dev_state *ps, 451 void __user *userurb) 452 { 453 struct async *as; 454 455 list_for_each_entry(as, &ps->async_pending, asynclist) 456 if (as->userurb == userurb) { 457 list_del_init(&as->asynclist); 458 return as; 459 } 460 461 return NULL; 462 } 463 464 static void snoop_urb(struct usb_device *udev, 465 void __user *userurb, int pipe, unsigned length, 466 int timeout_or_status, enum snoop_when when, 467 unsigned char *data, unsigned data_len) 468 { 469 static const char *types[] = {"isoc", "int", "ctrl", "bulk"}; 470 static const char *dirs[] = {"out", "in"}; 471 int ep; 472 const char *t, *d; 473 474 if (!usbfs_snoop) 475 return; 476 477 ep = usb_pipeendpoint(pipe); 478 t = types[usb_pipetype(pipe)]; 479 d = dirs[!!usb_pipein(pipe)]; 480 481 if (userurb) { /* Async */ 482 if (when == SUBMIT) 483 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, " 484 "length %u\n", 485 userurb, ep, t, d, length); 486 else 487 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, " 488 "actual_length %u status %d\n", 489 userurb, ep, t, d, length, 490 timeout_or_status); 491 } else { 492 if (when == SUBMIT) 493 dev_info(&udev->dev, "ep%d %s-%s, length %u, " 494 "timeout %d\n", 495 ep, t, d, length, timeout_or_status); 496 else 497 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, " 498 "status %d\n", 499 ep, t, d, length, timeout_or_status); 500 } 501 502 data_len = min(data_len, usbfs_snoop_max); 503 if (data && data_len > 0) { 504 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1, 505 data, data_len, 1); 506 } 507 } 508 509 static void snoop_urb_data(struct urb *urb, unsigned len) 510 { 511 int i, size; 512 513 len = min(len, usbfs_snoop_max); 514 if (!usbfs_snoop || len == 0) 515 return; 516 517 if (urb->num_sgs == 0) { 518 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1, 519 urb->transfer_buffer, len, 1); 520 return; 521 } 522 523 for (i = 0; i < urb->num_sgs && len; i++) { 524 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len; 525 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1, 526 sg_virt(&urb->sg[i]), size, 1); 527 len -= size; 528 } 529 } 530 531 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb) 532 { 533 unsigned i, len, size; 534 535 if (urb->number_of_packets > 0) /* Isochronous */ 536 len = urb->transfer_buffer_length; 537 else /* Non-Isoc */ 538 len = urb->actual_length; 539 540 if (urb->num_sgs == 0) { 541 if (copy_to_user(userbuffer, urb->transfer_buffer, len)) 542 return -EFAULT; 543 return 0; 544 } 545 546 for (i = 0; i < urb->num_sgs && len; i++) { 547 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len; 548 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size)) 549 return -EFAULT; 550 userbuffer += size; 551 len -= size; 552 } 553 554 return 0; 555 } 556 557 #define AS_CONTINUATION 1 558 #define AS_UNLINK 2 559 560 static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr) 561 __releases(ps->lock) 562 __acquires(ps->lock) 563 { 564 struct urb *urb; 565 struct async *as; 566 567 /* Mark all the pending URBs that match bulk_addr, up to but not 568 * including the first one without AS_CONTINUATION. If such an 569 * URB is encountered then a new transfer has already started so 570 * the endpoint doesn't need to be disabled; otherwise it does. 571 */ 572 list_for_each_entry(as, &ps->async_pending, asynclist) { 573 if (as->bulk_addr == bulk_addr) { 574 if (as->bulk_status != AS_CONTINUATION) 575 goto rescan; 576 as->bulk_status = AS_UNLINK; 577 as->bulk_addr = 0; 578 } 579 } 580 ps->disabled_bulk_eps |= (1 << bulk_addr); 581 582 /* Now carefully unlink all the marked pending URBs */ 583 rescan: 584 list_for_each_entry(as, &ps->async_pending, asynclist) { 585 if (as->bulk_status == AS_UNLINK) { 586 as->bulk_status = 0; /* Only once */ 587 urb = as->urb; 588 usb_get_urb(urb); 589 spin_unlock(&ps->lock); /* Allow completions */ 590 usb_unlink_urb(urb); 591 usb_put_urb(urb); 592 spin_lock(&ps->lock); 593 goto rescan; 594 } 595 } 596 } 597 598 static void async_completed(struct urb *urb) 599 { 600 struct async *as = urb->context; 601 struct usb_dev_state *ps = as->ps; 602 struct siginfo sinfo; 603 struct pid *pid = NULL; 604 u32 secid = 0; 605 const struct cred *cred = NULL; 606 int signr; 607 608 spin_lock(&ps->lock); 609 list_move_tail(&as->asynclist, &ps->async_completed); 610 as->status = urb->status; 611 signr = as->signr; 612 if (signr) { 613 memset(&sinfo, 0, sizeof(sinfo)); 614 sinfo.si_signo = as->signr; 615 sinfo.si_errno = as->status; 616 sinfo.si_code = SI_ASYNCIO; 617 sinfo.si_addr = as->userurb; 618 pid = get_pid(as->pid); 619 cred = get_cred(as->cred); 620 secid = as->secid; 621 } 622 snoop(&urb->dev->dev, "urb complete\n"); 623 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length, 624 as->status, COMPLETE, NULL, 0); 625 if ((urb->transfer_flags & URB_DIR_MASK) == URB_DIR_IN) 626 snoop_urb_data(urb, urb->actual_length); 627 628 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET && 629 as->status != -ENOENT) 630 cancel_bulk_urbs(ps, as->bulk_addr); 631 spin_unlock(&ps->lock); 632 633 if (signr) { 634 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid); 635 put_pid(pid); 636 put_cred(cred); 637 } 638 639 wake_up(&ps->wait); 640 } 641 642 static void destroy_async(struct usb_dev_state *ps, struct list_head *list) 643 { 644 struct urb *urb; 645 struct async *as; 646 unsigned long flags; 647 648 spin_lock_irqsave(&ps->lock, flags); 649 while (!list_empty(list)) { 650 as = list_entry(list->next, struct async, asynclist); 651 list_del_init(&as->asynclist); 652 urb = as->urb; 653 usb_get_urb(urb); 654 655 /* drop the spinlock so the completion handler can run */ 656 spin_unlock_irqrestore(&ps->lock, flags); 657 usb_kill_urb(urb); 658 usb_put_urb(urb); 659 spin_lock_irqsave(&ps->lock, flags); 660 } 661 spin_unlock_irqrestore(&ps->lock, flags); 662 } 663 664 static void destroy_async_on_interface(struct usb_dev_state *ps, 665 unsigned int ifnum) 666 { 667 struct list_head *p, *q, hitlist; 668 unsigned long flags; 669 670 INIT_LIST_HEAD(&hitlist); 671 spin_lock_irqsave(&ps->lock, flags); 672 list_for_each_safe(p, q, &ps->async_pending) 673 if (ifnum == list_entry(p, struct async, asynclist)->ifnum) 674 list_move_tail(p, &hitlist); 675 spin_unlock_irqrestore(&ps->lock, flags); 676 destroy_async(ps, &hitlist); 677 } 678 679 static void destroy_all_async(struct usb_dev_state *ps) 680 { 681 destroy_async(ps, &ps->async_pending); 682 } 683 684 /* 685 * interface claims are made only at the request of user level code, 686 * which can also release them (explicitly or by closing files). 687 * they're also undone when devices disconnect. 688 */ 689 690 static int driver_probe(struct usb_interface *intf, 691 const struct usb_device_id *id) 692 { 693 return -ENODEV; 694 } 695 696 static void driver_disconnect(struct usb_interface *intf) 697 { 698 struct usb_dev_state *ps = usb_get_intfdata(intf); 699 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber; 700 701 if (!ps) 702 return; 703 704 /* NOTE: this relies on usbcore having canceled and completed 705 * all pending I/O requests; 2.6 does that. 706 */ 707 708 if (likely(ifnum < 8*sizeof(ps->ifclaimed))) 709 clear_bit(ifnum, &ps->ifclaimed); 710 else 711 dev_warn(&intf->dev, "interface number %u out of range\n", 712 ifnum); 713 714 usb_set_intfdata(intf, NULL); 715 716 /* force async requests to complete */ 717 destroy_async_on_interface(ps, ifnum); 718 } 719 720 /* The following routines are merely placeholders. There is no way 721 * to inform a user task about suspend or resumes. 722 */ 723 static int driver_suspend(struct usb_interface *intf, pm_message_t msg) 724 { 725 return 0; 726 } 727 728 static int driver_resume(struct usb_interface *intf) 729 { 730 return 0; 731 } 732 733 struct usb_driver usbfs_driver = { 734 .name = "usbfs", 735 .probe = driver_probe, 736 .disconnect = driver_disconnect, 737 .suspend = driver_suspend, 738 .resume = driver_resume, 739 }; 740 741 static int claimintf(struct usb_dev_state *ps, unsigned int ifnum) 742 { 743 struct usb_device *dev = ps->dev; 744 struct usb_interface *intf; 745 int err; 746 747 if (ifnum >= 8*sizeof(ps->ifclaimed)) 748 return -EINVAL; 749 /* already claimed */ 750 if (test_bit(ifnum, &ps->ifclaimed)) 751 return 0; 752 753 if (ps->privileges_dropped && 754 !test_bit(ifnum, &ps->interface_allowed_mask)) 755 return -EACCES; 756 757 intf = usb_ifnum_to_if(dev, ifnum); 758 if (!intf) 759 err = -ENOENT; 760 else 761 err = usb_driver_claim_interface(&usbfs_driver, intf, ps); 762 if (err == 0) 763 set_bit(ifnum, &ps->ifclaimed); 764 return err; 765 } 766 767 static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum) 768 { 769 struct usb_device *dev; 770 struct usb_interface *intf; 771 int err; 772 773 err = -EINVAL; 774 if (ifnum >= 8*sizeof(ps->ifclaimed)) 775 return err; 776 dev = ps->dev; 777 intf = usb_ifnum_to_if(dev, ifnum); 778 if (!intf) 779 err = -ENOENT; 780 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) { 781 usb_driver_release_interface(&usbfs_driver, intf); 782 err = 0; 783 } 784 return err; 785 } 786 787 static int checkintf(struct usb_dev_state *ps, unsigned int ifnum) 788 { 789 if (ps->dev->state != USB_STATE_CONFIGURED) 790 return -EHOSTUNREACH; 791 if (ifnum >= 8*sizeof(ps->ifclaimed)) 792 return -EINVAL; 793 if (test_bit(ifnum, &ps->ifclaimed)) 794 return 0; 795 /* if not yet claimed, claim it for the driver */ 796 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim " 797 "interface %u before use\n", task_pid_nr(current), 798 current->comm, ifnum); 799 return claimintf(ps, ifnum); 800 } 801 802 static int findintfep(struct usb_device *dev, unsigned int ep) 803 { 804 unsigned int i, j, e; 805 struct usb_interface *intf; 806 struct usb_host_interface *alts; 807 struct usb_endpoint_descriptor *endpt; 808 809 if (ep & ~(USB_DIR_IN|0xf)) 810 return -EINVAL; 811 if (!dev->actconfig) 812 return -ESRCH; 813 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) { 814 intf = dev->actconfig->interface[i]; 815 for (j = 0; j < intf->num_altsetting; j++) { 816 alts = &intf->altsetting[j]; 817 for (e = 0; e < alts->desc.bNumEndpoints; e++) { 818 endpt = &alts->endpoint[e].desc; 819 if (endpt->bEndpointAddress == ep) 820 return alts->desc.bInterfaceNumber; 821 } 822 } 823 } 824 return -ENOENT; 825 } 826 827 static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype, 828 unsigned int request, unsigned int index) 829 { 830 int ret = 0; 831 struct usb_host_interface *alt_setting; 832 833 if (ps->dev->state != USB_STATE_UNAUTHENTICATED 834 && ps->dev->state != USB_STATE_ADDRESS 835 && ps->dev->state != USB_STATE_CONFIGURED) 836 return -EHOSTUNREACH; 837 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype)) 838 return 0; 839 840 /* 841 * check for the special corner case 'get_device_id' in the printer 842 * class specification, which we always want to allow as it is used 843 * to query things like ink level, etc. 844 */ 845 if (requesttype == 0xa1 && request == 0) { 846 alt_setting = usb_find_alt_setting(ps->dev->actconfig, 847 index >> 8, index & 0xff); 848 if (alt_setting 849 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER) 850 return 0; 851 } 852 853 index &= 0xff; 854 switch (requesttype & USB_RECIP_MASK) { 855 case USB_RECIP_ENDPOINT: 856 if ((index & ~USB_DIR_IN) == 0) 857 return 0; 858 ret = findintfep(ps->dev, index); 859 if (ret < 0) { 860 /* 861 * Some not fully compliant Win apps seem to get 862 * index wrong and have the endpoint number here 863 * rather than the endpoint address (with the 864 * correct direction). Win does let this through, 865 * so we'll not reject it here but leave it to 866 * the device to not break KVM. But we warn. 867 */ 868 ret = findintfep(ps->dev, index ^ 0x80); 869 if (ret >= 0) 870 dev_info(&ps->dev->dev, 871 "%s: process %i (%s) requesting ep %02x but needs %02x\n", 872 __func__, task_pid_nr(current), 873 current->comm, index, index ^ 0x80); 874 } 875 if (ret >= 0) 876 ret = checkintf(ps, ret); 877 break; 878 879 case USB_RECIP_INTERFACE: 880 ret = checkintf(ps, index); 881 break; 882 } 883 return ret; 884 } 885 886 static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev, 887 unsigned char ep) 888 { 889 if (ep & USB_ENDPOINT_DIR_MASK) 890 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK]; 891 else 892 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK]; 893 } 894 895 static int parse_usbdevfs_streams(struct usb_dev_state *ps, 896 struct usbdevfs_streams __user *streams, 897 unsigned int *num_streams_ret, 898 unsigned int *num_eps_ret, 899 struct usb_host_endpoint ***eps_ret, 900 struct usb_interface **intf_ret) 901 { 902 unsigned int i, num_streams, num_eps; 903 struct usb_host_endpoint **eps; 904 struct usb_interface *intf = NULL; 905 unsigned char ep; 906 int ifnum, ret; 907 908 if (get_user(num_streams, &streams->num_streams) || 909 get_user(num_eps, &streams->num_eps)) 910 return -EFAULT; 911 912 if (num_eps < 1 || num_eps > USB_MAXENDPOINTS) 913 return -EINVAL; 914 915 /* The XHCI controller allows max 2 ^ 16 streams */ 916 if (num_streams_ret && (num_streams < 2 || num_streams > 65536)) 917 return -EINVAL; 918 919 eps = kmalloc(num_eps * sizeof(*eps), GFP_KERNEL); 920 if (!eps) 921 return -ENOMEM; 922 923 for (i = 0; i < num_eps; i++) { 924 if (get_user(ep, &streams->eps[i])) { 925 ret = -EFAULT; 926 goto error; 927 } 928 eps[i] = ep_to_host_endpoint(ps->dev, ep); 929 if (!eps[i]) { 930 ret = -EINVAL; 931 goto error; 932 } 933 934 /* usb_alloc/free_streams operate on an usb_interface */ 935 ifnum = findintfep(ps->dev, ep); 936 if (ifnum < 0) { 937 ret = ifnum; 938 goto error; 939 } 940 941 if (i == 0) { 942 ret = checkintf(ps, ifnum); 943 if (ret < 0) 944 goto error; 945 intf = usb_ifnum_to_if(ps->dev, ifnum); 946 } else { 947 /* Verify all eps belong to the same interface */ 948 if (ifnum != intf->altsetting->desc.bInterfaceNumber) { 949 ret = -EINVAL; 950 goto error; 951 } 952 } 953 } 954 955 if (num_streams_ret) 956 *num_streams_ret = num_streams; 957 *num_eps_ret = num_eps; 958 *eps_ret = eps; 959 *intf_ret = intf; 960 961 return 0; 962 963 error: 964 kfree(eps); 965 return ret; 966 } 967 968 static int match_devt(struct device *dev, void *data) 969 { 970 return dev->devt == (dev_t) (unsigned long) data; 971 } 972 973 static struct usb_device *usbdev_lookup_by_devt(dev_t devt) 974 { 975 struct device *dev; 976 977 dev = bus_find_device(&usb_bus_type, NULL, 978 (void *) (unsigned long) devt, match_devt); 979 if (!dev) 980 return NULL; 981 return to_usb_device(dev); 982 } 983 984 /* 985 * file operations 986 */ 987 static int usbdev_open(struct inode *inode, struct file *file) 988 { 989 struct usb_device *dev = NULL; 990 struct usb_dev_state *ps; 991 int ret; 992 993 ret = -ENOMEM; 994 ps = kzalloc(sizeof(struct usb_dev_state), GFP_KERNEL); 995 if (!ps) 996 goto out_free_ps; 997 998 ret = -ENODEV; 999 1000 /* Protect against simultaneous removal or release */ 1001 mutex_lock(&usbfs_mutex); 1002 1003 /* usbdev device-node */ 1004 if (imajor(inode) == USB_DEVICE_MAJOR) 1005 dev = usbdev_lookup_by_devt(inode->i_rdev); 1006 1007 mutex_unlock(&usbfs_mutex); 1008 1009 if (!dev) 1010 goto out_free_ps; 1011 1012 usb_lock_device(dev); 1013 if (dev->state == USB_STATE_NOTATTACHED) 1014 goto out_unlock_device; 1015 1016 ret = usb_autoresume_device(dev); 1017 if (ret) 1018 goto out_unlock_device; 1019 1020 ps->dev = dev; 1021 ps->file = file; 1022 ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */ 1023 spin_lock_init(&ps->lock); 1024 INIT_LIST_HEAD(&ps->list); 1025 INIT_LIST_HEAD(&ps->async_pending); 1026 INIT_LIST_HEAD(&ps->async_completed); 1027 INIT_LIST_HEAD(&ps->memory_list); 1028 init_waitqueue_head(&ps->wait); 1029 ps->disc_pid = get_pid(task_pid(current)); 1030 ps->cred = get_current_cred(); 1031 security_task_getsecid(current, &ps->secid); 1032 smp_wmb(); 1033 list_add_tail(&ps->list, &dev->filelist); 1034 file->private_data = ps; 1035 usb_unlock_device(dev); 1036 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current), 1037 current->comm); 1038 return ret; 1039 1040 out_unlock_device: 1041 usb_unlock_device(dev); 1042 usb_put_dev(dev); 1043 out_free_ps: 1044 kfree(ps); 1045 return ret; 1046 } 1047 1048 static int usbdev_release(struct inode *inode, struct file *file) 1049 { 1050 struct usb_dev_state *ps = file->private_data; 1051 struct usb_device *dev = ps->dev; 1052 unsigned int ifnum; 1053 struct async *as; 1054 1055 usb_lock_device(dev); 1056 usb_hub_release_all_ports(dev, ps); 1057 1058 list_del_init(&ps->list); 1059 1060 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed); 1061 ifnum++) { 1062 if (test_bit(ifnum, &ps->ifclaimed)) 1063 releaseintf(ps, ifnum); 1064 } 1065 destroy_all_async(ps); 1066 usb_autosuspend_device(dev); 1067 usb_unlock_device(dev); 1068 usb_put_dev(dev); 1069 put_pid(ps->disc_pid); 1070 put_cred(ps->cred); 1071 1072 as = async_getcompleted(ps); 1073 while (as) { 1074 free_async(as); 1075 as = async_getcompleted(ps); 1076 } 1077 1078 kfree(ps); 1079 return 0; 1080 } 1081 1082 static int proc_control(struct usb_dev_state *ps, void __user *arg) 1083 { 1084 struct usb_device *dev = ps->dev; 1085 struct usbdevfs_ctrltransfer ctrl; 1086 unsigned int tmo; 1087 unsigned char *tbuf; 1088 unsigned wLength; 1089 int i, pipe, ret; 1090 1091 if (copy_from_user(&ctrl, arg, sizeof(ctrl))) 1092 return -EFAULT; 1093 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest, 1094 ctrl.wIndex); 1095 if (ret) 1096 return ret; 1097 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */ 1098 if (wLength > PAGE_SIZE) 1099 return -EINVAL; 1100 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) + 1101 sizeof(struct usb_ctrlrequest)); 1102 if (ret) 1103 return ret; 1104 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL); 1105 if (!tbuf) { 1106 ret = -ENOMEM; 1107 goto done; 1108 } 1109 tmo = ctrl.timeout; 1110 snoop(&dev->dev, "control urb: bRequestType=%02x " 1111 "bRequest=%02x wValue=%04x " 1112 "wIndex=%04x wLength=%04x\n", 1113 ctrl.bRequestType, ctrl.bRequest, ctrl.wValue, 1114 ctrl.wIndex, ctrl.wLength); 1115 if (ctrl.bRequestType & 0x80) { 1116 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data, 1117 ctrl.wLength)) { 1118 ret = -EINVAL; 1119 goto done; 1120 } 1121 pipe = usb_rcvctrlpipe(dev, 0); 1122 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0); 1123 1124 usb_unlock_device(dev); 1125 i = usb_control_msg(dev, pipe, ctrl.bRequest, 1126 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex, 1127 tbuf, ctrl.wLength, tmo); 1128 usb_lock_device(dev); 1129 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, 1130 tbuf, max(i, 0)); 1131 if ((i > 0) && ctrl.wLength) { 1132 if (copy_to_user(ctrl.data, tbuf, i)) { 1133 ret = -EFAULT; 1134 goto done; 1135 } 1136 } 1137 } else { 1138 if (ctrl.wLength) { 1139 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) { 1140 ret = -EFAULT; 1141 goto done; 1142 } 1143 } 1144 pipe = usb_sndctrlpipe(dev, 0); 1145 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, 1146 tbuf, ctrl.wLength); 1147 1148 usb_unlock_device(dev); 1149 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, 1150 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex, 1151 tbuf, ctrl.wLength, tmo); 1152 usb_lock_device(dev); 1153 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0); 1154 } 1155 if (i < 0 && i != -EPIPE) { 1156 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL " 1157 "failed cmd %s rqt %u rq %u len %u ret %d\n", 1158 current->comm, ctrl.bRequestType, ctrl.bRequest, 1159 ctrl.wLength, i); 1160 } 1161 ret = i; 1162 done: 1163 free_page((unsigned long) tbuf); 1164 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) + 1165 sizeof(struct usb_ctrlrequest)); 1166 return ret; 1167 } 1168 1169 static int proc_bulk(struct usb_dev_state *ps, void __user *arg) 1170 { 1171 struct usb_device *dev = ps->dev; 1172 struct usbdevfs_bulktransfer bulk; 1173 unsigned int tmo, len1, pipe; 1174 int len2; 1175 unsigned char *tbuf; 1176 int i, ret; 1177 1178 if (copy_from_user(&bulk, arg, sizeof(bulk))) 1179 return -EFAULT; 1180 ret = findintfep(ps->dev, bulk.ep); 1181 if (ret < 0) 1182 return ret; 1183 ret = checkintf(ps, ret); 1184 if (ret) 1185 return ret; 1186 if (bulk.ep & USB_DIR_IN) 1187 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f); 1188 else 1189 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f); 1190 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN))) 1191 return -EINVAL; 1192 len1 = bulk.len; 1193 if (len1 >= USBFS_XFER_MAX) 1194 return -EINVAL; 1195 ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb)); 1196 if (ret) 1197 return ret; 1198 tbuf = kmalloc(len1, GFP_KERNEL); 1199 if (!tbuf) { 1200 ret = -ENOMEM; 1201 goto done; 1202 } 1203 tmo = bulk.timeout; 1204 if (bulk.ep & 0x80) { 1205 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) { 1206 ret = -EINVAL; 1207 goto done; 1208 } 1209 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0); 1210 1211 usb_unlock_device(dev); 1212 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo); 1213 usb_lock_device(dev); 1214 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2); 1215 1216 if (!i && len2) { 1217 if (copy_to_user(bulk.data, tbuf, len2)) { 1218 ret = -EFAULT; 1219 goto done; 1220 } 1221 } 1222 } else { 1223 if (len1) { 1224 if (copy_from_user(tbuf, bulk.data, len1)) { 1225 ret = -EFAULT; 1226 goto done; 1227 } 1228 } 1229 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1); 1230 1231 usb_unlock_device(dev); 1232 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo); 1233 usb_lock_device(dev); 1234 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0); 1235 } 1236 ret = (i < 0 ? i : len2); 1237 done: 1238 kfree(tbuf); 1239 usbfs_decrease_memory_usage(len1 + sizeof(struct urb)); 1240 return ret; 1241 } 1242 1243 static void check_reset_of_active_ep(struct usb_device *udev, 1244 unsigned int epnum, char *ioctl_name) 1245 { 1246 struct usb_host_endpoint **eps; 1247 struct usb_host_endpoint *ep; 1248 1249 eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out; 1250 ep = eps[epnum & 0x0f]; 1251 if (ep && !list_empty(&ep->urb_list)) 1252 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n", 1253 task_pid_nr(current), current->comm, 1254 ioctl_name, epnum); 1255 } 1256 1257 static int proc_resetep(struct usb_dev_state *ps, void __user *arg) 1258 { 1259 unsigned int ep; 1260 int ret; 1261 1262 if (get_user(ep, (unsigned int __user *)arg)) 1263 return -EFAULT; 1264 ret = findintfep(ps->dev, ep); 1265 if (ret < 0) 1266 return ret; 1267 ret = checkintf(ps, ret); 1268 if (ret) 1269 return ret; 1270 check_reset_of_active_ep(ps->dev, ep, "RESETEP"); 1271 usb_reset_endpoint(ps->dev, ep); 1272 return 0; 1273 } 1274 1275 static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg) 1276 { 1277 unsigned int ep; 1278 int pipe; 1279 int ret; 1280 1281 if (get_user(ep, (unsigned int __user *)arg)) 1282 return -EFAULT; 1283 ret = findintfep(ps->dev, ep); 1284 if (ret < 0) 1285 return ret; 1286 ret = checkintf(ps, ret); 1287 if (ret) 1288 return ret; 1289 check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT"); 1290 if (ep & USB_DIR_IN) 1291 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f); 1292 else 1293 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f); 1294 1295 return usb_clear_halt(ps->dev, pipe); 1296 } 1297 1298 static int proc_getdriver(struct usb_dev_state *ps, void __user *arg) 1299 { 1300 struct usbdevfs_getdriver gd; 1301 struct usb_interface *intf; 1302 int ret; 1303 1304 if (copy_from_user(&gd, arg, sizeof(gd))) 1305 return -EFAULT; 1306 intf = usb_ifnum_to_if(ps->dev, gd.interface); 1307 if (!intf || !intf->dev.driver) 1308 ret = -ENODATA; 1309 else { 1310 strlcpy(gd.driver, intf->dev.driver->name, 1311 sizeof(gd.driver)); 1312 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0); 1313 } 1314 return ret; 1315 } 1316 1317 static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg) 1318 { 1319 struct usbdevfs_connectinfo ci = { 1320 .devnum = ps->dev->devnum, 1321 .slow = ps->dev->speed == USB_SPEED_LOW 1322 }; 1323 1324 if (copy_to_user(arg, &ci, sizeof(ci))) 1325 return -EFAULT; 1326 return 0; 1327 } 1328 1329 static int proc_resetdevice(struct usb_dev_state *ps) 1330 { 1331 struct usb_host_config *actconfig = ps->dev->actconfig; 1332 struct usb_interface *interface; 1333 int i, number; 1334 1335 /* Don't allow a device reset if the process has dropped the 1336 * privilege to do such things and any of the interfaces are 1337 * currently claimed. 1338 */ 1339 if (ps->privileges_dropped && actconfig) { 1340 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) { 1341 interface = actconfig->interface[i]; 1342 number = interface->cur_altsetting->desc.bInterfaceNumber; 1343 if (usb_interface_claimed(interface) && 1344 !test_bit(number, &ps->ifclaimed)) { 1345 dev_warn(&ps->dev->dev, 1346 "usbfs: interface %d claimed by %s while '%s' resets device\n", 1347 number, interface->dev.driver->name, current->comm); 1348 return -EACCES; 1349 } 1350 } 1351 } 1352 1353 return usb_reset_device(ps->dev); 1354 } 1355 1356 static int proc_setintf(struct usb_dev_state *ps, void __user *arg) 1357 { 1358 struct usbdevfs_setinterface setintf; 1359 int ret; 1360 1361 if (copy_from_user(&setintf, arg, sizeof(setintf))) 1362 return -EFAULT; 1363 ret = checkintf(ps, setintf.interface); 1364 if (ret) 1365 return ret; 1366 1367 destroy_async_on_interface(ps, setintf.interface); 1368 1369 return usb_set_interface(ps->dev, setintf.interface, 1370 setintf.altsetting); 1371 } 1372 1373 static int proc_setconfig(struct usb_dev_state *ps, void __user *arg) 1374 { 1375 int u; 1376 int status = 0; 1377 struct usb_host_config *actconfig; 1378 1379 if (get_user(u, (int __user *)arg)) 1380 return -EFAULT; 1381 1382 actconfig = ps->dev->actconfig; 1383 1384 /* Don't touch the device if any interfaces are claimed. 1385 * It could interfere with other drivers' operations, and if 1386 * an interface is claimed by usbfs it could easily deadlock. 1387 */ 1388 if (actconfig) { 1389 int i; 1390 1391 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) { 1392 if (usb_interface_claimed(actconfig->interface[i])) { 1393 dev_warn(&ps->dev->dev, 1394 "usbfs: interface %d claimed by %s " 1395 "while '%s' sets config #%d\n", 1396 actconfig->interface[i] 1397 ->cur_altsetting 1398 ->desc.bInterfaceNumber, 1399 actconfig->interface[i] 1400 ->dev.driver->name, 1401 current->comm, u); 1402 status = -EBUSY; 1403 break; 1404 } 1405 } 1406 } 1407 1408 /* SET_CONFIGURATION is often abused as a "cheap" driver reset, 1409 * so avoid usb_set_configuration()'s kick to sysfs 1410 */ 1411 if (status == 0) { 1412 if (actconfig && actconfig->desc.bConfigurationValue == u) 1413 status = usb_reset_configuration(ps->dev); 1414 else 1415 status = usb_set_configuration(ps->dev, u); 1416 } 1417 1418 return status; 1419 } 1420 1421 static struct usb_memory * 1422 find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb) 1423 { 1424 struct usb_memory *usbm = NULL, *iter; 1425 unsigned long flags; 1426 unsigned long uurb_start = (unsigned long)uurb->buffer; 1427 1428 spin_lock_irqsave(&ps->lock, flags); 1429 list_for_each_entry(iter, &ps->memory_list, memlist) { 1430 if (uurb_start >= iter->vm_start && 1431 uurb_start < iter->vm_start + iter->size) { 1432 if (uurb->buffer_length > iter->vm_start + iter->size - 1433 uurb_start) { 1434 usbm = ERR_PTR(-EINVAL); 1435 } else { 1436 usbm = iter; 1437 usbm->urb_use_count++; 1438 } 1439 break; 1440 } 1441 } 1442 spin_unlock_irqrestore(&ps->lock, flags); 1443 return usbm; 1444 } 1445 1446 static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb, 1447 struct usbdevfs_iso_packet_desc __user *iso_frame_desc, 1448 void __user *arg) 1449 { 1450 struct usbdevfs_iso_packet_desc *isopkt = NULL; 1451 struct usb_host_endpoint *ep; 1452 struct async *as = NULL; 1453 struct usb_ctrlrequest *dr = NULL; 1454 unsigned int u, totlen, isofrmlen; 1455 int i, ret, is_in, num_sgs = 0, ifnum = -1; 1456 int number_of_packets = 0; 1457 unsigned int stream_id = 0; 1458 void *buf; 1459 1460 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP | 1461 USBDEVFS_URB_SHORT_NOT_OK | 1462 USBDEVFS_URB_BULK_CONTINUATION | 1463 USBDEVFS_URB_NO_FSBR | 1464 USBDEVFS_URB_ZERO_PACKET | 1465 USBDEVFS_URB_NO_INTERRUPT)) 1466 return -EINVAL; 1467 if (uurb->buffer_length > 0 && !uurb->buffer) 1468 return -EINVAL; 1469 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && 1470 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) { 1471 ifnum = findintfep(ps->dev, uurb->endpoint); 1472 if (ifnum < 0) 1473 return ifnum; 1474 ret = checkintf(ps, ifnum); 1475 if (ret) 1476 return ret; 1477 } 1478 ep = ep_to_host_endpoint(ps->dev, uurb->endpoint); 1479 if (!ep) 1480 return -ENOENT; 1481 is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0; 1482 1483 u = 0; 1484 switch (uurb->type) { 1485 case USBDEVFS_URB_TYPE_CONTROL: 1486 if (!usb_endpoint_xfer_control(&ep->desc)) 1487 return -EINVAL; 1488 /* min 8 byte setup packet */ 1489 if (uurb->buffer_length < 8) 1490 return -EINVAL; 1491 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL); 1492 if (!dr) 1493 return -ENOMEM; 1494 if (copy_from_user(dr, uurb->buffer, 8)) { 1495 ret = -EFAULT; 1496 goto error; 1497 } 1498 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) { 1499 ret = -EINVAL; 1500 goto error; 1501 } 1502 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest, 1503 le16_to_cpup(&dr->wIndex)); 1504 if (ret) 1505 goto error; 1506 uurb->buffer_length = le16_to_cpup(&dr->wLength); 1507 uurb->buffer += 8; 1508 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) { 1509 is_in = 1; 1510 uurb->endpoint |= USB_DIR_IN; 1511 } else { 1512 is_in = 0; 1513 uurb->endpoint &= ~USB_DIR_IN; 1514 } 1515 snoop(&ps->dev->dev, "control urb: bRequestType=%02x " 1516 "bRequest=%02x wValue=%04x " 1517 "wIndex=%04x wLength=%04x\n", 1518 dr->bRequestType, dr->bRequest, 1519 __le16_to_cpup(&dr->wValue), 1520 __le16_to_cpup(&dr->wIndex), 1521 __le16_to_cpup(&dr->wLength)); 1522 u = sizeof(struct usb_ctrlrequest); 1523 break; 1524 1525 case USBDEVFS_URB_TYPE_BULK: 1526 switch (usb_endpoint_type(&ep->desc)) { 1527 case USB_ENDPOINT_XFER_CONTROL: 1528 case USB_ENDPOINT_XFER_ISOC: 1529 return -EINVAL; 1530 case USB_ENDPOINT_XFER_INT: 1531 /* allow single-shot interrupt transfers */ 1532 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT; 1533 goto interrupt_urb; 1534 } 1535 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE); 1536 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize) 1537 num_sgs = 0; 1538 if (ep->streams) 1539 stream_id = uurb->stream_id; 1540 break; 1541 1542 case USBDEVFS_URB_TYPE_INTERRUPT: 1543 if (!usb_endpoint_xfer_int(&ep->desc)) 1544 return -EINVAL; 1545 interrupt_urb: 1546 break; 1547 1548 case USBDEVFS_URB_TYPE_ISO: 1549 /* arbitrary limit */ 1550 if (uurb->number_of_packets < 1 || 1551 uurb->number_of_packets > 128) 1552 return -EINVAL; 1553 if (!usb_endpoint_xfer_isoc(&ep->desc)) 1554 return -EINVAL; 1555 number_of_packets = uurb->number_of_packets; 1556 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * 1557 number_of_packets; 1558 isopkt = memdup_user(iso_frame_desc, isofrmlen); 1559 if (IS_ERR(isopkt)) { 1560 ret = PTR_ERR(isopkt); 1561 isopkt = NULL; 1562 goto error; 1563 } 1564 for (totlen = u = 0; u < number_of_packets; u++) { 1565 /* 1566 * arbitrary limit need for USB 3.0 1567 * bMaxBurst (0~15 allowed, 1~16 packets) 1568 * bmAttributes (bit 1:0, mult 0~2, 1~3 packets) 1569 * sizemax: 1024 * 16 * 3 = 49152 1570 */ 1571 if (isopkt[u].length > 49152) { 1572 ret = -EINVAL; 1573 goto error; 1574 } 1575 totlen += isopkt[u].length; 1576 } 1577 u *= sizeof(struct usb_iso_packet_descriptor); 1578 uurb->buffer_length = totlen; 1579 break; 1580 1581 default: 1582 return -EINVAL; 1583 } 1584 1585 if (uurb->buffer_length >= USBFS_XFER_MAX) { 1586 ret = -EINVAL; 1587 goto error; 1588 } 1589 if (uurb->buffer_length > 0 && 1590 !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ, 1591 uurb->buffer, uurb->buffer_length)) { 1592 ret = -EFAULT; 1593 goto error; 1594 } 1595 as = alloc_async(number_of_packets); 1596 if (!as) { 1597 ret = -ENOMEM; 1598 goto error; 1599 } 1600 1601 as->usbm = find_memory_area(ps, uurb); 1602 if (IS_ERR(as->usbm)) { 1603 ret = PTR_ERR(as->usbm); 1604 as->usbm = NULL; 1605 goto error; 1606 } 1607 1608 /* do not use SG buffers when memory mapped segments 1609 * are in use 1610 */ 1611 if (as->usbm) 1612 num_sgs = 0; 1613 1614 u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length + 1615 num_sgs * sizeof(struct scatterlist); 1616 ret = usbfs_increase_memory_usage(u); 1617 if (ret) 1618 goto error; 1619 as->mem_usage = u; 1620 1621 if (num_sgs) { 1622 as->urb->sg = kmalloc(num_sgs * sizeof(struct scatterlist), 1623 GFP_KERNEL); 1624 if (!as->urb->sg) { 1625 ret = -ENOMEM; 1626 goto error; 1627 } 1628 as->urb->num_sgs = num_sgs; 1629 sg_init_table(as->urb->sg, as->urb->num_sgs); 1630 1631 totlen = uurb->buffer_length; 1632 for (i = 0; i < as->urb->num_sgs; i++) { 1633 u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen; 1634 buf = kmalloc(u, GFP_KERNEL); 1635 if (!buf) { 1636 ret = -ENOMEM; 1637 goto error; 1638 } 1639 sg_set_buf(&as->urb->sg[i], buf, u); 1640 1641 if (!is_in) { 1642 if (copy_from_user(buf, uurb->buffer, u)) { 1643 ret = -EFAULT; 1644 goto error; 1645 } 1646 uurb->buffer += u; 1647 } 1648 totlen -= u; 1649 } 1650 } else if (uurb->buffer_length > 0) { 1651 if (as->usbm) { 1652 unsigned long uurb_start = (unsigned long)uurb->buffer; 1653 1654 as->urb->transfer_buffer = as->usbm->mem + 1655 (uurb_start - as->usbm->vm_start); 1656 } else { 1657 as->urb->transfer_buffer = kmalloc(uurb->buffer_length, 1658 GFP_KERNEL); 1659 if (!as->urb->transfer_buffer) { 1660 ret = -ENOMEM; 1661 goto error; 1662 } 1663 if (!is_in) { 1664 if (copy_from_user(as->urb->transfer_buffer, 1665 uurb->buffer, 1666 uurb->buffer_length)) { 1667 ret = -EFAULT; 1668 goto error; 1669 } 1670 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) { 1671 /* 1672 * Isochronous input data may end up being 1673 * discontiguous if some of the packets are 1674 * short. Clear the buffer so that the gaps 1675 * don't leak kernel data to userspace. 1676 */ 1677 memset(as->urb->transfer_buffer, 0, 1678 uurb->buffer_length); 1679 } 1680 } 1681 } 1682 as->urb->dev = ps->dev; 1683 as->urb->pipe = (uurb->type << 30) | 1684 __create_pipe(ps->dev, uurb->endpoint & 0xf) | 1685 (uurb->endpoint & USB_DIR_IN); 1686 1687 /* This tedious sequence is necessary because the URB_* flags 1688 * are internal to the kernel and subject to change, whereas 1689 * the USBDEVFS_URB_* flags are a user API and must not be changed. 1690 */ 1691 u = (is_in ? URB_DIR_IN : URB_DIR_OUT); 1692 if (uurb->flags & USBDEVFS_URB_ISO_ASAP) 1693 u |= URB_ISO_ASAP; 1694 if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK && is_in) 1695 u |= URB_SHORT_NOT_OK; 1696 if (uurb->flags & USBDEVFS_URB_NO_FSBR) 1697 u |= URB_NO_FSBR; 1698 if (uurb->flags & USBDEVFS_URB_ZERO_PACKET) 1699 u |= URB_ZERO_PACKET; 1700 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT) 1701 u |= URB_NO_INTERRUPT; 1702 as->urb->transfer_flags = u; 1703 1704 as->urb->transfer_buffer_length = uurb->buffer_length; 1705 as->urb->setup_packet = (unsigned char *)dr; 1706 dr = NULL; 1707 as->urb->start_frame = uurb->start_frame; 1708 as->urb->number_of_packets = number_of_packets; 1709 as->urb->stream_id = stream_id; 1710 if (uurb->type == USBDEVFS_URB_TYPE_ISO || 1711 ps->dev->speed == USB_SPEED_HIGH) 1712 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1); 1713 else 1714 as->urb->interval = ep->desc.bInterval; 1715 as->urb->context = as; 1716 as->urb->complete = async_completed; 1717 for (totlen = u = 0; u < number_of_packets; u++) { 1718 as->urb->iso_frame_desc[u].offset = totlen; 1719 as->urb->iso_frame_desc[u].length = isopkt[u].length; 1720 totlen += isopkt[u].length; 1721 } 1722 kfree(isopkt); 1723 isopkt = NULL; 1724 as->ps = ps; 1725 as->userurb = arg; 1726 if (as->usbm) { 1727 unsigned long uurb_start = (unsigned long)uurb->buffer; 1728 1729 as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 1730 as->urb->transfer_dma = as->usbm->dma_handle + 1731 (uurb_start - as->usbm->vm_start); 1732 } else if (is_in && uurb->buffer_length > 0) 1733 as->userbuffer = uurb->buffer; 1734 as->signr = uurb->signr; 1735 as->ifnum = ifnum; 1736 as->pid = get_pid(task_pid(current)); 1737 as->cred = get_current_cred(); 1738 security_task_getsecid(current, &as->secid); 1739 snoop_urb(ps->dev, as->userurb, as->urb->pipe, 1740 as->urb->transfer_buffer_length, 0, SUBMIT, 1741 NULL, 0); 1742 if (!is_in) 1743 snoop_urb_data(as->urb, as->urb->transfer_buffer_length); 1744 1745 async_newpending(as); 1746 1747 if (usb_endpoint_xfer_bulk(&ep->desc)) { 1748 spin_lock_irq(&ps->lock); 1749 1750 /* Not exactly the endpoint address; the direction bit is 1751 * shifted to the 0x10 position so that the value will be 1752 * between 0 and 31. 1753 */ 1754 as->bulk_addr = usb_endpoint_num(&ep->desc) | 1755 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK) 1756 >> 3); 1757 1758 /* If this bulk URB is the start of a new transfer, re-enable 1759 * the endpoint. Otherwise mark it as a continuation URB. 1760 */ 1761 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION) 1762 as->bulk_status = AS_CONTINUATION; 1763 else 1764 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr); 1765 1766 /* Don't accept continuation URBs if the endpoint is 1767 * disabled because of an earlier error. 1768 */ 1769 if (ps->disabled_bulk_eps & (1 << as->bulk_addr)) 1770 ret = -EREMOTEIO; 1771 else 1772 ret = usb_submit_urb(as->urb, GFP_ATOMIC); 1773 spin_unlock_irq(&ps->lock); 1774 } else { 1775 ret = usb_submit_urb(as->urb, GFP_KERNEL); 1776 } 1777 1778 if (ret) { 1779 dev_printk(KERN_DEBUG, &ps->dev->dev, 1780 "usbfs: usb_submit_urb returned %d\n", ret); 1781 snoop_urb(ps->dev, as->userurb, as->urb->pipe, 1782 0, ret, COMPLETE, NULL, 0); 1783 async_removepending(as); 1784 goto error; 1785 } 1786 return 0; 1787 1788 error: 1789 if (as && as->usbm) 1790 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count); 1791 kfree(isopkt); 1792 kfree(dr); 1793 if (as) 1794 free_async(as); 1795 return ret; 1796 } 1797 1798 static int proc_submiturb(struct usb_dev_state *ps, void __user *arg) 1799 { 1800 struct usbdevfs_urb uurb; 1801 1802 if (copy_from_user(&uurb, arg, sizeof(uurb))) 1803 return -EFAULT; 1804 1805 return proc_do_submiturb(ps, &uurb, 1806 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc), 1807 arg); 1808 } 1809 1810 static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg) 1811 { 1812 struct urb *urb; 1813 struct async *as; 1814 unsigned long flags; 1815 1816 spin_lock_irqsave(&ps->lock, flags); 1817 as = async_getpending(ps, arg); 1818 if (!as) { 1819 spin_unlock_irqrestore(&ps->lock, flags); 1820 return -EINVAL; 1821 } 1822 1823 urb = as->urb; 1824 usb_get_urb(urb); 1825 spin_unlock_irqrestore(&ps->lock, flags); 1826 1827 usb_kill_urb(urb); 1828 usb_put_urb(urb); 1829 1830 return 0; 1831 } 1832 1833 static int processcompl(struct async *as, void __user * __user *arg) 1834 { 1835 struct urb *urb = as->urb; 1836 struct usbdevfs_urb __user *userurb = as->userurb; 1837 void __user *addr = as->userurb; 1838 unsigned int i; 1839 1840 if (as->userbuffer && urb->actual_length) { 1841 if (copy_urb_data_to_user(as->userbuffer, urb)) 1842 goto err_out; 1843 } 1844 if (put_user(as->status, &userurb->status)) 1845 goto err_out; 1846 if (put_user(urb->actual_length, &userurb->actual_length)) 1847 goto err_out; 1848 if (put_user(urb->error_count, &userurb->error_count)) 1849 goto err_out; 1850 1851 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) { 1852 for (i = 0; i < urb->number_of_packets; i++) { 1853 if (put_user(urb->iso_frame_desc[i].actual_length, 1854 &userurb->iso_frame_desc[i].actual_length)) 1855 goto err_out; 1856 if (put_user(urb->iso_frame_desc[i].status, 1857 &userurb->iso_frame_desc[i].status)) 1858 goto err_out; 1859 } 1860 } 1861 1862 if (put_user(addr, (void __user * __user *)arg)) 1863 return -EFAULT; 1864 return 0; 1865 1866 err_out: 1867 return -EFAULT; 1868 } 1869 1870 static struct async *reap_as(struct usb_dev_state *ps) 1871 { 1872 DECLARE_WAITQUEUE(wait, current); 1873 struct async *as = NULL; 1874 struct usb_device *dev = ps->dev; 1875 1876 add_wait_queue(&ps->wait, &wait); 1877 for (;;) { 1878 __set_current_state(TASK_INTERRUPTIBLE); 1879 as = async_getcompleted(ps); 1880 if (as || !connected(ps)) 1881 break; 1882 if (signal_pending(current)) 1883 break; 1884 usb_unlock_device(dev); 1885 schedule(); 1886 usb_lock_device(dev); 1887 } 1888 remove_wait_queue(&ps->wait, &wait); 1889 set_current_state(TASK_RUNNING); 1890 return as; 1891 } 1892 1893 static int proc_reapurb(struct usb_dev_state *ps, void __user *arg) 1894 { 1895 struct async *as = reap_as(ps); 1896 1897 if (as) { 1898 int retval; 1899 1900 snoop(&ps->dev->dev, "reap %p\n", as->userurb); 1901 retval = processcompl(as, (void __user * __user *)arg); 1902 free_async(as); 1903 return retval; 1904 } 1905 if (signal_pending(current)) 1906 return -EINTR; 1907 return -ENODEV; 1908 } 1909 1910 static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg) 1911 { 1912 int retval; 1913 struct async *as; 1914 1915 as = async_getcompleted(ps); 1916 if (as) { 1917 snoop(&ps->dev->dev, "reap %p\n", as->userurb); 1918 retval = processcompl(as, (void __user * __user *)arg); 1919 free_async(as); 1920 } else { 1921 retval = (connected(ps) ? -EAGAIN : -ENODEV); 1922 } 1923 return retval; 1924 } 1925 1926 #ifdef CONFIG_COMPAT 1927 static int proc_control_compat(struct usb_dev_state *ps, 1928 struct usbdevfs_ctrltransfer32 __user *p32) 1929 { 1930 struct usbdevfs_ctrltransfer __user *p; 1931 __u32 udata; 1932 p = compat_alloc_user_space(sizeof(*p)); 1933 if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) || 1934 get_user(udata, &p32->data) || 1935 put_user(compat_ptr(udata), &p->data)) 1936 return -EFAULT; 1937 return proc_control(ps, p); 1938 } 1939 1940 static int proc_bulk_compat(struct usb_dev_state *ps, 1941 struct usbdevfs_bulktransfer32 __user *p32) 1942 { 1943 struct usbdevfs_bulktransfer __user *p; 1944 compat_uint_t n; 1945 compat_caddr_t addr; 1946 1947 p = compat_alloc_user_space(sizeof(*p)); 1948 1949 if (get_user(n, &p32->ep) || put_user(n, &p->ep) || 1950 get_user(n, &p32->len) || put_user(n, &p->len) || 1951 get_user(n, &p32->timeout) || put_user(n, &p->timeout) || 1952 get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data)) 1953 return -EFAULT; 1954 1955 return proc_bulk(ps, p); 1956 } 1957 static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg) 1958 { 1959 struct usbdevfs_disconnectsignal32 ds; 1960 1961 if (copy_from_user(&ds, arg, sizeof(ds))) 1962 return -EFAULT; 1963 ps->discsignr = ds.signr; 1964 ps->disccontext = compat_ptr(ds.context); 1965 return 0; 1966 } 1967 1968 static int get_urb32(struct usbdevfs_urb *kurb, 1969 struct usbdevfs_urb32 __user *uurb) 1970 { 1971 __u32 uptr; 1972 if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) || 1973 __get_user(kurb->type, &uurb->type) || 1974 __get_user(kurb->endpoint, &uurb->endpoint) || 1975 __get_user(kurb->status, &uurb->status) || 1976 __get_user(kurb->flags, &uurb->flags) || 1977 __get_user(kurb->buffer_length, &uurb->buffer_length) || 1978 __get_user(kurb->actual_length, &uurb->actual_length) || 1979 __get_user(kurb->start_frame, &uurb->start_frame) || 1980 __get_user(kurb->number_of_packets, &uurb->number_of_packets) || 1981 __get_user(kurb->error_count, &uurb->error_count) || 1982 __get_user(kurb->signr, &uurb->signr)) 1983 return -EFAULT; 1984 1985 if (__get_user(uptr, &uurb->buffer)) 1986 return -EFAULT; 1987 kurb->buffer = compat_ptr(uptr); 1988 if (__get_user(uptr, &uurb->usercontext)) 1989 return -EFAULT; 1990 kurb->usercontext = compat_ptr(uptr); 1991 1992 return 0; 1993 } 1994 1995 static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg) 1996 { 1997 struct usbdevfs_urb uurb; 1998 1999 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg)) 2000 return -EFAULT; 2001 2002 return proc_do_submiturb(ps, &uurb, 2003 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc, 2004 arg); 2005 } 2006 2007 static int processcompl_compat(struct async *as, void __user * __user *arg) 2008 { 2009 struct urb *urb = as->urb; 2010 struct usbdevfs_urb32 __user *userurb = as->userurb; 2011 void __user *addr = as->userurb; 2012 unsigned int i; 2013 2014 if (as->userbuffer && urb->actual_length) { 2015 if (copy_urb_data_to_user(as->userbuffer, urb)) 2016 return -EFAULT; 2017 } 2018 if (put_user(as->status, &userurb->status)) 2019 return -EFAULT; 2020 if (put_user(urb->actual_length, &userurb->actual_length)) 2021 return -EFAULT; 2022 if (put_user(urb->error_count, &userurb->error_count)) 2023 return -EFAULT; 2024 2025 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) { 2026 for (i = 0; i < urb->number_of_packets; i++) { 2027 if (put_user(urb->iso_frame_desc[i].actual_length, 2028 &userurb->iso_frame_desc[i].actual_length)) 2029 return -EFAULT; 2030 if (put_user(urb->iso_frame_desc[i].status, 2031 &userurb->iso_frame_desc[i].status)) 2032 return -EFAULT; 2033 } 2034 } 2035 2036 if (put_user(ptr_to_compat(addr), (u32 __user *)arg)) 2037 return -EFAULT; 2038 return 0; 2039 } 2040 2041 static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg) 2042 { 2043 struct async *as = reap_as(ps); 2044 2045 if (as) { 2046 int retval; 2047 2048 snoop(&ps->dev->dev, "reap %p\n", as->userurb); 2049 retval = processcompl_compat(as, (void __user * __user *)arg); 2050 free_async(as); 2051 return retval; 2052 } 2053 if (signal_pending(current)) 2054 return -EINTR; 2055 return -ENODEV; 2056 } 2057 2058 static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg) 2059 { 2060 int retval; 2061 struct async *as; 2062 2063 as = async_getcompleted(ps); 2064 if (as) { 2065 snoop(&ps->dev->dev, "reap %p\n", as->userurb); 2066 retval = processcompl_compat(as, (void __user * __user *)arg); 2067 free_async(as); 2068 } else { 2069 retval = (connected(ps) ? -EAGAIN : -ENODEV); 2070 } 2071 return retval; 2072 } 2073 2074 2075 #endif 2076 2077 static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg) 2078 { 2079 struct usbdevfs_disconnectsignal ds; 2080 2081 if (copy_from_user(&ds, arg, sizeof(ds))) 2082 return -EFAULT; 2083 ps->discsignr = ds.signr; 2084 ps->disccontext = ds.context; 2085 return 0; 2086 } 2087 2088 static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg) 2089 { 2090 unsigned int ifnum; 2091 2092 if (get_user(ifnum, (unsigned int __user *)arg)) 2093 return -EFAULT; 2094 return claimintf(ps, ifnum); 2095 } 2096 2097 static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg) 2098 { 2099 unsigned int ifnum; 2100 int ret; 2101 2102 if (get_user(ifnum, (unsigned int __user *)arg)) 2103 return -EFAULT; 2104 ret = releaseintf(ps, ifnum); 2105 if (ret < 0) 2106 return ret; 2107 destroy_async_on_interface(ps, ifnum); 2108 return 0; 2109 } 2110 2111 static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl) 2112 { 2113 int size; 2114 void *buf = NULL; 2115 int retval = 0; 2116 struct usb_interface *intf = NULL; 2117 struct usb_driver *driver = NULL; 2118 2119 if (ps->privileges_dropped) 2120 return -EACCES; 2121 2122 /* alloc buffer */ 2123 size = _IOC_SIZE(ctl->ioctl_code); 2124 if (size > 0) { 2125 buf = kmalloc(size, GFP_KERNEL); 2126 if (buf == NULL) 2127 return -ENOMEM; 2128 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) { 2129 if (copy_from_user(buf, ctl->data, size)) { 2130 kfree(buf); 2131 return -EFAULT; 2132 } 2133 } else { 2134 memset(buf, 0, size); 2135 } 2136 } 2137 2138 if (!connected(ps)) { 2139 kfree(buf); 2140 return -ENODEV; 2141 } 2142 2143 if (ps->dev->state != USB_STATE_CONFIGURED) 2144 retval = -EHOSTUNREACH; 2145 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno))) 2146 retval = -EINVAL; 2147 else switch (ctl->ioctl_code) { 2148 2149 /* disconnect kernel driver from interface */ 2150 case USBDEVFS_DISCONNECT: 2151 if (intf->dev.driver) { 2152 driver = to_usb_driver(intf->dev.driver); 2153 dev_dbg(&intf->dev, "disconnect by usbfs\n"); 2154 usb_driver_release_interface(driver, intf); 2155 } else 2156 retval = -ENODATA; 2157 break; 2158 2159 /* let kernel drivers try to (re)bind to the interface */ 2160 case USBDEVFS_CONNECT: 2161 if (!intf->dev.driver) 2162 retval = device_attach(&intf->dev); 2163 else 2164 retval = -EBUSY; 2165 break; 2166 2167 /* talk directly to the interface's driver */ 2168 default: 2169 if (intf->dev.driver) 2170 driver = to_usb_driver(intf->dev.driver); 2171 if (driver == NULL || driver->unlocked_ioctl == NULL) { 2172 retval = -ENOTTY; 2173 } else { 2174 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf); 2175 if (retval == -ENOIOCTLCMD) 2176 retval = -ENOTTY; 2177 } 2178 } 2179 2180 /* cleanup and return */ 2181 if (retval >= 0 2182 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0 2183 && size > 0 2184 && copy_to_user(ctl->data, buf, size) != 0) 2185 retval = -EFAULT; 2186 2187 kfree(buf); 2188 return retval; 2189 } 2190 2191 static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg) 2192 { 2193 struct usbdevfs_ioctl ctrl; 2194 2195 if (copy_from_user(&ctrl, arg, sizeof(ctrl))) 2196 return -EFAULT; 2197 return proc_ioctl(ps, &ctrl); 2198 } 2199 2200 #ifdef CONFIG_COMPAT 2201 static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg) 2202 { 2203 struct usbdevfs_ioctl32 __user *uioc; 2204 struct usbdevfs_ioctl ctrl; 2205 u32 udata; 2206 2207 uioc = compat_ptr((long)arg); 2208 if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) || 2209 __get_user(ctrl.ifno, &uioc->ifno) || 2210 __get_user(ctrl.ioctl_code, &uioc->ioctl_code) || 2211 __get_user(udata, &uioc->data)) 2212 return -EFAULT; 2213 ctrl.data = compat_ptr(udata); 2214 2215 return proc_ioctl(ps, &ctrl); 2216 } 2217 #endif 2218 2219 static int proc_claim_port(struct usb_dev_state *ps, void __user *arg) 2220 { 2221 unsigned portnum; 2222 int rc; 2223 2224 if (get_user(portnum, (unsigned __user *) arg)) 2225 return -EFAULT; 2226 rc = usb_hub_claim_port(ps->dev, portnum, ps); 2227 if (rc == 0) 2228 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n", 2229 portnum, task_pid_nr(current), current->comm); 2230 return rc; 2231 } 2232 2233 static int proc_release_port(struct usb_dev_state *ps, void __user *arg) 2234 { 2235 unsigned portnum; 2236 2237 if (get_user(portnum, (unsigned __user *) arg)) 2238 return -EFAULT; 2239 return usb_hub_release_port(ps->dev, portnum, ps); 2240 } 2241 2242 static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg) 2243 { 2244 __u32 caps; 2245 2246 caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM | 2247 USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP | 2248 USBDEVFS_CAP_DROP_PRIVILEGES; 2249 if (!ps->dev->bus->no_stop_on_short) 2250 caps |= USBDEVFS_CAP_BULK_CONTINUATION; 2251 if (ps->dev->bus->sg_tablesize) 2252 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER; 2253 2254 if (put_user(caps, (__u32 __user *)arg)) 2255 return -EFAULT; 2256 2257 return 0; 2258 } 2259 2260 static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg) 2261 { 2262 struct usbdevfs_disconnect_claim dc; 2263 struct usb_interface *intf; 2264 2265 if (copy_from_user(&dc, arg, sizeof(dc))) 2266 return -EFAULT; 2267 2268 intf = usb_ifnum_to_if(ps->dev, dc.interface); 2269 if (!intf) 2270 return -EINVAL; 2271 2272 if (intf->dev.driver) { 2273 struct usb_driver *driver = to_usb_driver(intf->dev.driver); 2274 2275 if (ps->privileges_dropped) 2276 return -EACCES; 2277 2278 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) && 2279 strncmp(dc.driver, intf->dev.driver->name, 2280 sizeof(dc.driver)) != 0) 2281 return -EBUSY; 2282 2283 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) && 2284 strncmp(dc.driver, intf->dev.driver->name, 2285 sizeof(dc.driver)) == 0) 2286 return -EBUSY; 2287 2288 dev_dbg(&intf->dev, "disconnect by usbfs\n"); 2289 usb_driver_release_interface(driver, intf); 2290 } 2291 2292 return claimintf(ps, dc.interface); 2293 } 2294 2295 static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg) 2296 { 2297 unsigned num_streams, num_eps; 2298 struct usb_host_endpoint **eps; 2299 struct usb_interface *intf; 2300 int r; 2301 2302 r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps, 2303 &eps, &intf); 2304 if (r) 2305 return r; 2306 2307 destroy_async_on_interface(ps, 2308 intf->altsetting[0].desc.bInterfaceNumber); 2309 2310 r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL); 2311 kfree(eps); 2312 return r; 2313 } 2314 2315 static int proc_free_streams(struct usb_dev_state *ps, void __user *arg) 2316 { 2317 unsigned num_eps; 2318 struct usb_host_endpoint **eps; 2319 struct usb_interface *intf; 2320 int r; 2321 2322 r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf); 2323 if (r) 2324 return r; 2325 2326 destroy_async_on_interface(ps, 2327 intf->altsetting[0].desc.bInterfaceNumber); 2328 2329 r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL); 2330 kfree(eps); 2331 return r; 2332 } 2333 2334 static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg) 2335 { 2336 u32 data; 2337 2338 if (copy_from_user(&data, arg, sizeof(data))) 2339 return -EFAULT; 2340 2341 /* This is an one way operation. Once privileges are 2342 * dropped, you cannot regain them. You may however reissue 2343 * this ioctl to shrink the allowed interfaces mask. 2344 */ 2345 ps->interface_allowed_mask &= data; 2346 ps->privileges_dropped = true; 2347 2348 return 0; 2349 } 2350 2351 /* 2352 * NOTE: All requests here that have interface numbers as parameters 2353 * are assuming that somehow the configuration has been prevented from 2354 * changing. But there's no mechanism to ensure that... 2355 */ 2356 static long usbdev_do_ioctl(struct file *file, unsigned int cmd, 2357 void __user *p) 2358 { 2359 struct usb_dev_state *ps = file->private_data; 2360 struct inode *inode = file_inode(file); 2361 struct usb_device *dev = ps->dev; 2362 int ret = -ENOTTY; 2363 2364 if (!(file->f_mode & FMODE_WRITE)) 2365 return -EPERM; 2366 2367 usb_lock_device(dev); 2368 2369 /* Reap operations are allowed even after disconnection */ 2370 switch (cmd) { 2371 case USBDEVFS_REAPURB: 2372 snoop(&dev->dev, "%s: REAPURB\n", __func__); 2373 ret = proc_reapurb(ps, p); 2374 goto done; 2375 2376 case USBDEVFS_REAPURBNDELAY: 2377 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__); 2378 ret = proc_reapurbnonblock(ps, p); 2379 goto done; 2380 2381 #ifdef CONFIG_COMPAT 2382 case USBDEVFS_REAPURB32: 2383 snoop(&dev->dev, "%s: REAPURB32\n", __func__); 2384 ret = proc_reapurb_compat(ps, p); 2385 goto done; 2386 2387 case USBDEVFS_REAPURBNDELAY32: 2388 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__); 2389 ret = proc_reapurbnonblock_compat(ps, p); 2390 goto done; 2391 #endif 2392 } 2393 2394 if (!connected(ps)) { 2395 usb_unlock_device(dev); 2396 return -ENODEV; 2397 } 2398 2399 switch (cmd) { 2400 case USBDEVFS_CONTROL: 2401 snoop(&dev->dev, "%s: CONTROL\n", __func__); 2402 ret = proc_control(ps, p); 2403 if (ret >= 0) 2404 inode->i_mtime = CURRENT_TIME; 2405 break; 2406 2407 case USBDEVFS_BULK: 2408 snoop(&dev->dev, "%s: BULK\n", __func__); 2409 ret = proc_bulk(ps, p); 2410 if (ret >= 0) 2411 inode->i_mtime = CURRENT_TIME; 2412 break; 2413 2414 case USBDEVFS_RESETEP: 2415 snoop(&dev->dev, "%s: RESETEP\n", __func__); 2416 ret = proc_resetep(ps, p); 2417 if (ret >= 0) 2418 inode->i_mtime = CURRENT_TIME; 2419 break; 2420 2421 case USBDEVFS_RESET: 2422 snoop(&dev->dev, "%s: RESET\n", __func__); 2423 ret = proc_resetdevice(ps); 2424 break; 2425 2426 case USBDEVFS_CLEAR_HALT: 2427 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__); 2428 ret = proc_clearhalt(ps, p); 2429 if (ret >= 0) 2430 inode->i_mtime = CURRENT_TIME; 2431 break; 2432 2433 case USBDEVFS_GETDRIVER: 2434 snoop(&dev->dev, "%s: GETDRIVER\n", __func__); 2435 ret = proc_getdriver(ps, p); 2436 break; 2437 2438 case USBDEVFS_CONNECTINFO: 2439 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__); 2440 ret = proc_connectinfo(ps, p); 2441 break; 2442 2443 case USBDEVFS_SETINTERFACE: 2444 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__); 2445 ret = proc_setintf(ps, p); 2446 break; 2447 2448 case USBDEVFS_SETCONFIGURATION: 2449 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__); 2450 ret = proc_setconfig(ps, p); 2451 break; 2452 2453 case USBDEVFS_SUBMITURB: 2454 snoop(&dev->dev, "%s: SUBMITURB\n", __func__); 2455 ret = proc_submiturb(ps, p); 2456 if (ret >= 0) 2457 inode->i_mtime = CURRENT_TIME; 2458 break; 2459 2460 #ifdef CONFIG_COMPAT 2461 case USBDEVFS_CONTROL32: 2462 snoop(&dev->dev, "%s: CONTROL32\n", __func__); 2463 ret = proc_control_compat(ps, p); 2464 if (ret >= 0) 2465 inode->i_mtime = CURRENT_TIME; 2466 break; 2467 2468 case USBDEVFS_BULK32: 2469 snoop(&dev->dev, "%s: BULK32\n", __func__); 2470 ret = proc_bulk_compat(ps, p); 2471 if (ret >= 0) 2472 inode->i_mtime = CURRENT_TIME; 2473 break; 2474 2475 case USBDEVFS_DISCSIGNAL32: 2476 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__); 2477 ret = proc_disconnectsignal_compat(ps, p); 2478 break; 2479 2480 case USBDEVFS_SUBMITURB32: 2481 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__); 2482 ret = proc_submiturb_compat(ps, p); 2483 if (ret >= 0) 2484 inode->i_mtime = CURRENT_TIME; 2485 break; 2486 2487 case USBDEVFS_IOCTL32: 2488 snoop(&dev->dev, "%s: IOCTL32\n", __func__); 2489 ret = proc_ioctl_compat(ps, ptr_to_compat(p)); 2490 break; 2491 #endif 2492 2493 case USBDEVFS_DISCARDURB: 2494 snoop(&dev->dev, "%s: DISCARDURB %p\n", __func__, p); 2495 ret = proc_unlinkurb(ps, p); 2496 break; 2497 2498 case USBDEVFS_DISCSIGNAL: 2499 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__); 2500 ret = proc_disconnectsignal(ps, p); 2501 break; 2502 2503 case USBDEVFS_CLAIMINTERFACE: 2504 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__); 2505 ret = proc_claiminterface(ps, p); 2506 break; 2507 2508 case USBDEVFS_RELEASEINTERFACE: 2509 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__); 2510 ret = proc_releaseinterface(ps, p); 2511 break; 2512 2513 case USBDEVFS_IOCTL: 2514 snoop(&dev->dev, "%s: IOCTL\n", __func__); 2515 ret = proc_ioctl_default(ps, p); 2516 break; 2517 2518 case USBDEVFS_CLAIM_PORT: 2519 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__); 2520 ret = proc_claim_port(ps, p); 2521 break; 2522 2523 case USBDEVFS_RELEASE_PORT: 2524 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__); 2525 ret = proc_release_port(ps, p); 2526 break; 2527 case USBDEVFS_GET_CAPABILITIES: 2528 ret = proc_get_capabilities(ps, p); 2529 break; 2530 case USBDEVFS_DISCONNECT_CLAIM: 2531 ret = proc_disconnect_claim(ps, p); 2532 break; 2533 case USBDEVFS_ALLOC_STREAMS: 2534 ret = proc_alloc_streams(ps, p); 2535 break; 2536 case USBDEVFS_FREE_STREAMS: 2537 ret = proc_free_streams(ps, p); 2538 break; 2539 case USBDEVFS_DROP_PRIVILEGES: 2540 ret = proc_drop_privileges(ps, p); 2541 break; 2542 } 2543 2544 done: 2545 usb_unlock_device(dev); 2546 if (ret >= 0) 2547 inode->i_atime = CURRENT_TIME; 2548 return ret; 2549 } 2550 2551 static long usbdev_ioctl(struct file *file, unsigned int cmd, 2552 unsigned long arg) 2553 { 2554 int ret; 2555 2556 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg); 2557 2558 return ret; 2559 } 2560 2561 #ifdef CONFIG_COMPAT 2562 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd, 2563 unsigned long arg) 2564 { 2565 int ret; 2566 2567 ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg)); 2568 2569 return ret; 2570 } 2571 #endif 2572 2573 /* No kernel lock - fine */ 2574 static unsigned int usbdev_poll(struct file *file, 2575 struct poll_table_struct *wait) 2576 { 2577 struct usb_dev_state *ps = file->private_data; 2578 unsigned int mask = 0; 2579 2580 poll_wait(file, &ps->wait, wait); 2581 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed)) 2582 mask |= POLLOUT | POLLWRNORM; 2583 if (!connected(ps)) 2584 mask |= POLLERR | POLLHUP; 2585 return mask; 2586 } 2587 2588 const struct file_operations usbdev_file_operations = { 2589 .owner = THIS_MODULE, 2590 .llseek = no_seek_end_llseek, 2591 .read = usbdev_read, 2592 .poll = usbdev_poll, 2593 .unlocked_ioctl = usbdev_ioctl, 2594 #ifdef CONFIG_COMPAT 2595 .compat_ioctl = usbdev_compat_ioctl, 2596 #endif 2597 .mmap = usbdev_mmap, 2598 .open = usbdev_open, 2599 .release = usbdev_release, 2600 }; 2601 2602 static void usbdev_remove(struct usb_device *udev) 2603 { 2604 struct usb_dev_state *ps; 2605 struct siginfo sinfo; 2606 2607 while (!list_empty(&udev->filelist)) { 2608 ps = list_entry(udev->filelist.next, struct usb_dev_state, list); 2609 destroy_all_async(ps); 2610 wake_up_all(&ps->wait); 2611 list_del_init(&ps->list); 2612 if (ps->discsignr) { 2613 memset(&sinfo, 0, sizeof(sinfo)); 2614 sinfo.si_signo = ps->discsignr; 2615 sinfo.si_errno = EPIPE; 2616 sinfo.si_code = SI_ASYNCIO; 2617 sinfo.si_addr = ps->disccontext; 2618 kill_pid_info_as_cred(ps->discsignr, &sinfo, 2619 ps->disc_pid, ps->cred, ps->secid); 2620 } 2621 } 2622 } 2623 2624 static int usbdev_notify(struct notifier_block *self, 2625 unsigned long action, void *dev) 2626 { 2627 switch (action) { 2628 case USB_DEVICE_ADD: 2629 break; 2630 case USB_DEVICE_REMOVE: 2631 usbdev_remove(dev); 2632 break; 2633 } 2634 return NOTIFY_OK; 2635 } 2636 2637 static struct notifier_block usbdev_nb = { 2638 .notifier_call = usbdev_notify, 2639 }; 2640 2641 static struct cdev usb_device_cdev; 2642 2643 int __init usb_devio_init(void) 2644 { 2645 int retval; 2646 2647 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX, 2648 "usb_device"); 2649 if (retval) { 2650 printk(KERN_ERR "Unable to register minors for usb_device\n"); 2651 goto out; 2652 } 2653 cdev_init(&usb_device_cdev, &usbdev_file_operations); 2654 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX); 2655 if (retval) { 2656 printk(KERN_ERR "Unable to get usb_device major %d\n", 2657 USB_DEVICE_MAJOR); 2658 goto error_cdev; 2659 } 2660 usb_register_notify(&usbdev_nb); 2661 out: 2662 return retval; 2663 2664 error_cdev: 2665 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX); 2666 goto out; 2667 } 2668 2669 void usb_devio_cleanup(void) 2670 { 2671 usb_unregister_notify(&usbdev_nb); 2672 cdev_del(&usb_device_cdev); 2673 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX); 2674 } 2675