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