drivers/usb/core/devio.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*****************************************************************************/
   3
   4 /*
   5  *      devio.c  --  User space communication with USB devices.
   6  *
   7  *      Copyright (C) 1999-2000  Thomas Sailer (sailer@ife.ee.ethz.ch)
   8  *
   9  *  This file implements the usbfs/x/y files, where
  10  *  x is the bus number and y the device number.
  11  *
  12  *  It allows user space programs/"drivers" to communicate directly
  13  *  with USB devices without intervening kernel driver.
  14  *
  15  *  Revision history
  16  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
  17  *    04.01.2000   0.2   Turned into its own filesystem
  18  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
  19  *                       (CAN-2005-3055)
  20  */
  21
  22 /*****************************************************************************/
  23
  24 #include <linux/fs.h>
  25 #include <linux/mm.h>
  26 #include <linux/sched/signal.h>
  27 #include <linux/slab.h>
  28 #include <linux/signal.h>
  29 #include <linux/poll.h>
  30 #include <linux/module.h>
  31 #include <linux/string.h>
  32 #include <linux/usb.h>
  33 #include <linux/usbdevice_fs.h>
  34 #include <linux/usb/hcd.h>      /* for usbcore internals */
  35 #include <linux/usb/quirks.h>
  36 #include <linux/cdev.h>
  37 #include <linux/notifier.h>
  38 #include <linux/security.h>
  39 #include <linux/user_namespace.h>
  40 #include <linux/scatterlist.h>
  41 #include <linux/uaccess.h>
  42 #include <linux/dma-mapping.h>
  43 #include <asm/byteorder.h>
  44 #include <linux/moduleparam.h>
  45
  46 #include "usb.h"
  47
  48 #ifdef CONFIG_PM
  49 #define MAYBE_CAP_SUSPEND       USBDEVFS_CAP_SUSPEND
  50 #else
  51 #define MAYBE_CAP_SUSPEND       0
  52 #endif
  53
  54 #define USB_MAXBUS                      64
  55 #define USB_DEVICE_MAX                  (USB_MAXBUS * 128)
  56 #define USB_SG_SIZE                     16384 /* split-size for large txs */
  57
  58 /* Mutual exclusion for ps->list in resume vs. release and remove */
  59 static DEFINE_MUTEX(usbfs_mutex);
  60
  61 struct usb_dev_state {
  62         struct list_head list;      /* state list */
  63         struct usb_device *dev;
  64         struct file *file;
  65         spinlock_t lock;            /* protects the async urb lists */
  66         struct list_head async_pending;
  67         struct list_head async_completed;
  68         struct list_head memory_list;
  69         wait_queue_head_t wait;     /* wake up if a request completed */
  70         wait_queue_head_t wait_for_resume;   /* wake up upon runtime resume */
  71         unsigned int discsignr;
  72         struct pid *disc_pid;
  73         const struct cred *cred;
  74         sigval_t disccontext;
  75         unsigned long ifclaimed;
  76         u32 disabled_bulk_eps;
  77         unsigned long interface_allowed_mask;
  78         int not_yet_resumed;
  79         bool suspend_allowed;
  80         bool privileges_dropped;
  81 };
  82
  83 struct usb_memory {
  84         struct list_head memlist;
  85         int vma_use_count;
  86         int urb_use_count;
  87         u32 size;
  88         void *mem;
  89         dma_addr_t dma_handle;
  90         unsigned long vm_start;
  91         struct usb_dev_state *ps;
  92 };
  93
  94 struct async {
  95         struct list_head asynclist;
  96         struct usb_dev_state *ps;
  97         struct pid *pid;
  98         const struct cred *cred;
  99         unsigned int signr;
 100         unsigned int ifnum;
 101         void __user *userbuffer;
 102         void __user *userurb;
 103         sigval_t userurb_sigval;
 104         struct urb *urb;
 105         struct usb_memory *usbm;
 106         unsigned int mem_usage;
 107         int status;
 108         u8 bulk_addr;
 109         u8 bulk_status;
 110 };
 111
 112 static bool usbfs_snoop;
 113 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
 114 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
 115
 116 static unsigned usbfs_snoop_max = 65536;
 117 module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR);
 118 MODULE_PARM_DESC(usbfs_snoop_max,
 119                 "maximum number of bytes to print while snooping");
 120
 121 #define snoop(dev, format, arg...)                              \
 122         do {                                                    \
 123                 if (usbfs_snoop)                                \
 124                         dev_info(dev, format, ## arg);          \
 125         } while (0)
 126
 127 enum snoop_when {
 128         SUBMIT, COMPLETE
 129 };
 130
 131 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
 132
 133 /* Limit on the total amount of memory we can allocate for transfers */
 134 static u32 usbfs_memory_mb = 16;
 135 module_param(usbfs_memory_mb, uint, 0644);
 136 MODULE_PARM_DESC(usbfs_memory_mb,
 137                 "maximum MB allowed for usbfs buffers (0 = no limit)");
 138
 139 /* Hard limit, necessary to avoid arithmetic overflow */
 140 #define USBFS_XFER_MAX         (UINT_MAX / 2 - 1000000)
 141
 142 static DEFINE_SPINLOCK(usbfs_memory_usage_lock);
 143 static u64 usbfs_memory_usage;  /* Total memory currently allocated */
 144
 145 /* Check whether it's okay to allocate more memory for a transfer */
 146 static int usbfs_increase_memory_usage(u64 amount)
 147 {
 148         u64 lim, total_mem;
 149         unsigned long flags;
 150         int ret;
 151
 152         lim = READ_ONCE(usbfs_memory_mb);
 153         lim <<= 20;
 154
 155         ret = 0;
 156         spin_lock_irqsave(&usbfs_memory_usage_lock, flags);
 157         total_mem = usbfs_memory_usage + amount;
 158         if (lim > 0 && total_mem > lim)
 159                 ret = -ENOMEM;
 160         else
 161                 usbfs_memory_usage = total_mem;
 162         spin_unlock_irqrestore(&usbfs_memory_usage_lock, flags);
 163
 164         return ret;
 165 }
 166
 167 /* Memory for a transfer is being deallocated */
 168 static void usbfs_decrease_memory_usage(u64 amount)
 169 {
 170         unsigned long flags;
 171
 172         spin_lock_irqsave(&usbfs_memory_usage_lock, flags);
 173         if (amount > usbfs_memory_usage)
 174                 usbfs_memory_usage = 0;
 175         else
 176                 usbfs_memory_usage -= amount;
 177         spin_unlock_irqrestore(&usbfs_memory_usage_lock, flags);
 178 }
 179
 180 static int connected(struct usb_dev_state *ps)
 181 {
 182         return (!list_empty(&ps->list) &&
 183                         ps->dev->state != USB_STATE_NOTATTACHED);
 184 }
 185
 186 static void dec_usb_memory_use_count(struct usb_memory *usbm, int *count)
 187 {
 188         struct usb_dev_state *ps = usbm->ps;
 189         struct usb_hcd *hcd = bus_to_hcd(ps->dev->bus);
 190         unsigned long flags;
 191
 192         spin_lock_irqsave(&ps->lock, flags);
 193         --*count;
 194         if (usbm->urb_use_count == 0 && usbm->vma_use_count == 0) {
 195                 list_del(&usbm->memlist);
 196                 spin_unlock_irqrestore(&ps->lock, flags);
 197
 198                 hcd_buffer_free_pages(hcd, usbm->size,
 199                                 usbm->mem, usbm->dma_handle);
 200                 usbfs_decrease_memory_usage(
 201                         usbm->size + sizeof(struct usb_memory));
 202                 kfree(usbm);
 203         } else {
 204                 spin_unlock_irqrestore(&ps->lock, flags);
 205         }
 206 }
 207
 208 static void usbdev_vm_open(struct vm_area_struct *vma)
 209 {
 210         struct usb_memory *usbm = vma->vm_private_data;
 211         unsigned long flags;
 212
 213         spin_lock_irqsave(&usbm->ps->lock, flags);
 214         ++usbm->vma_use_count;
 215         spin_unlock_irqrestore(&usbm->ps->lock, flags);
 216 }
 217
 218 static void usbdev_vm_close(struct vm_area_struct *vma)
 219 {
 220         struct usb_memory *usbm = vma->vm_private_data;
 221
 222         dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
 223 }
 224
 225 static const struct vm_operations_struct usbdev_vm_ops = {
 226         .open = usbdev_vm_open,
 227         .close = usbdev_vm_close
 228 };
 229
 230 static int usbdev_mmap(struct file *file, struct vm_area_struct *vma)
 231 {
 232         struct usb_memory *usbm = NULL;
 233         struct usb_dev_state *ps = file->private_data;
 234         struct usb_hcd *hcd = bus_to_hcd(ps->dev->bus);
 235         size_t size = vma->vm_end - vma->vm_start;
 236         void *mem;
 237         unsigned long flags;
 238         dma_addr_t dma_handle = DMA_MAPPING_ERROR;
 239         int ret;
 240
 241         ret = usbfs_increase_memory_usage(size + sizeof(struct usb_memory));
 242         if (ret)
 243                 goto error;
 244
 245         usbm = kzalloc(sizeof(struct usb_memory), GFP_KERNEL);
 246         if (!usbm) {
 247                 ret = -ENOMEM;
 248                 goto error_decrease_mem;
 249         }
 250
 251         mem = hcd_buffer_alloc_pages(hcd,
 252                         size, GFP_USER | __GFP_NOWARN, &dma_handle);
 253         if (!mem) {
 254                 ret = -ENOMEM;
 255                 goto error_free_usbm;
 256         }
 257
 258         memset(mem, 0, size);
 259
 260         usbm->mem = mem;
 261         usbm->dma_handle = dma_handle;
 262         usbm->size = size;
 263         usbm->ps = ps;
 264         usbm->vm_start = vma->vm_start;
 265         usbm->vma_use_count = 1;
 266         INIT_LIST_HEAD(&usbm->memlist);
 267
 268         /*
 269          * In DMA-unavailable cases, hcd_buffer_alloc_pages allocates
 270          * normal pages and assigns DMA_MAPPING_ERROR to dma_handle. Check
 271          * whether we are in such cases, and then use remap_pfn_range (or
 272          * dma_mmap_coherent) to map normal (or DMA) pages into the user
 273          * space, respectively.
 274          */
 275         if (dma_handle == DMA_MAPPING_ERROR) {
 276                 if (remap_pfn_range(vma, vma->vm_start,
 277                                     virt_to_phys(usbm->mem) >> PAGE_SHIFT,
 278                                     size, vma->vm_page_prot) < 0) {
 279                         dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
 280                         return -EAGAIN;
 281                 }
 282         } else {
 283                 if (dma_mmap_coherent(hcd->self.sysdev, vma, mem, dma_handle,
 284                                       size)) {
 285                         dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
 286                         return -EAGAIN;
 287                 }
 288         }
 289
 290         vm_flags_set(vma, VM_IO | VM_DONTEXPAND | VM_DONTDUMP);
 291         vma->vm_ops = &usbdev_vm_ops;
 292         vma->vm_private_data = usbm;
 293
 294         spin_lock_irqsave(&ps->lock, flags);
 295         list_add_tail(&usbm->memlist, &ps->memory_list);
 296         spin_unlock_irqrestore(&ps->lock, flags);
 297
 298         return 0;
 299
 300 error_free_usbm:
 301         kfree(usbm);
 302 error_decrease_mem:
 303         usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
 304 error:
 305         return ret;
 306 }
 307
 308 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
 309                            loff_t *ppos)
 310 {
 311         struct usb_dev_state *ps = file->private_data;
 312         struct usb_device *dev = ps->dev;
 313         ssize_t ret = 0;
 314         unsigned len;
 315         loff_t pos;
 316         int i;
 317
 318         pos = *ppos;
 319         usb_lock_device(dev);
 320         if (!connected(ps)) {
 321                 ret = -ENODEV;
 322                 goto err;
 323         } else if (pos < 0) {
 324                 ret = -EINVAL;
 325                 goto err;
 326         }
 327
 328         if (pos < sizeof(struct usb_device_descriptor)) {
 329                 /* 18 bytes - fits on the stack */
 330                 struct usb_device_descriptor temp_desc;
 331
 332                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 333                 le16_to_cpus(&temp_desc.bcdUSB);
 334                 le16_to_cpus(&temp_desc.idVendor);
 335                 le16_to_cpus(&temp_desc.idProduct);
 336                 le16_to_cpus(&temp_desc.bcdDevice);
 337
 338                 len = sizeof(struct usb_device_descriptor) - pos;
 339                 if (len > nbytes)
 340                         len = nbytes;
 341                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 342                         ret = -EFAULT;
 343                         goto err;
 344                 }
 345
 346                 *ppos += len;
 347                 buf += len;
 348                 nbytes -= len;
 349                 ret += len;
 350         }
 351
 352         pos = sizeof(struct usb_device_descriptor);
 353         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 354                 struct usb_config_descriptor *config =
 355                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 356                 unsigned int length = le16_to_cpu(config->wTotalLength);
 357
 358                 if (*ppos < pos + length) {
 359
 360                         /* The descriptor may claim to be longer than it
 361                          * really is.  Here is the actual allocated length. */
 362                         unsigned alloclen =
 363                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 364
 365                         len = length - (*ppos - pos);
 366                         if (len > nbytes)
 367                                 len = nbytes;
 368
 369                         /* Simply don't write (skip over) unallocated parts */
 370                         if (alloclen > (*ppos - pos)) {
 371                                 alloclen -= (*ppos - pos);
 372                                 if (copy_to_user(buf,
 373                                     dev->rawdescriptors[i] + (*ppos - pos),
 374                                     min(len, alloclen))) {
 375                                         ret = -EFAULT;
 376                                         goto err;
 377                                 }
 378                         }
 379
 380                         *ppos += len;
 381                         buf += len;
 382                         nbytes -= len;
 383                         ret += len;
 384                 }
 385
 386                 pos += length;
 387         }
 388
 389 err:
 390         usb_unlock_device(dev);
 391         return ret;
 392 }
 393
 394 /*
 395  * async list handling
 396  */
 397
 398 static struct async *alloc_async(unsigned int numisoframes)
 399 {
 400         struct async *as;
 401
 402         as = kzalloc(sizeof(struct async), GFP_KERNEL);
 403         if (!as)
 404                 return NULL;
 405         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 406         if (!as->urb) {
 407                 kfree(as);
 408                 return NULL;
 409         }
 410         return as;
 411 }
 412
 413 static void free_async(struct async *as)
 414 {
 415         int i;
 416
 417         put_pid(as->pid);
 418         if (as->cred)
 419                 put_cred(as->cred);
 420         for (i = 0; i < as->urb->num_sgs; i++) {
 421                 if (sg_page(&as->urb->sg[i]))
 422                         kfree(sg_virt(&as->urb->sg[i]));
 423         }
 424
 425         kfree(as->urb->sg);
 426         if (as->usbm == NULL)
 427                 kfree(as->urb->transfer_buffer);
 428         else
 429                 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
 430
 431         kfree(as->urb->setup_packet);
 432         usb_free_urb(as->urb);
 433         usbfs_decrease_memory_usage(as->mem_usage);
 434         kfree(as);
 435 }
 436
 437 static void async_newpending(struct async *as)
 438 {
 439         struct usb_dev_state *ps = as->ps;
 440         unsigned long flags;
 441
 442         spin_lock_irqsave(&ps->lock, flags);
 443         list_add_tail(&as->asynclist, &ps->async_pending);
 444         spin_unlock_irqrestore(&ps->lock, flags);
 445 }
 446
 447 static void async_removepending(struct async *as)
 448 {
 449         struct usb_dev_state *ps = as->ps;
 450         unsigned long flags;
 451
 452         spin_lock_irqsave(&ps->lock, flags);
 453         list_del_init(&as->asynclist);
 454         spin_unlock_irqrestore(&ps->lock, flags);
 455 }
 456
 457 static struct async *async_getcompleted(struct usb_dev_state *ps)
 458 {
 459         unsigned long flags;
 460         struct async *as = NULL;
 461
 462         spin_lock_irqsave(&ps->lock, flags);
 463         if (!list_empty(&ps->async_completed)) {
 464                 as = list_entry(ps->async_completed.next, struct async,
 465                                 asynclist);
 466                 list_del_init(&as->asynclist);
 467         }
 468         spin_unlock_irqrestore(&ps->lock, flags);
 469         return as;
 470 }
 471
 472 static struct async *async_getpending(struct usb_dev_state *ps,
 473                                              void __user *userurb)
 474 {
 475         struct async *as;
 476
 477         list_for_each_entry(as, &ps->async_pending, asynclist)
 478                 if (as->userurb == userurb) {
 479                         list_del_init(&as->asynclist);
 480                         return as;
 481                 }
 482
 483         return NULL;
 484 }
 485
 486 static void snoop_urb(struct usb_device *udev,
 487                 void __user *userurb, int pipe, unsigned length,
 488                 int timeout_or_status, enum snoop_when when,
 489                 unsigned char *data, unsigned data_len)
 490 {
 491         static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
 492         static const char *dirs[] = {"out", "in"};
 493         int ep;
 494         const char *t, *d;
 495
 496         if (!usbfs_snoop)
 497                 return;
 498
 499         ep = usb_pipeendpoint(pipe);
 500         t = types[usb_pipetype(pipe)];
 501         d = dirs[!!usb_pipein(pipe)];
 502
 503         if (userurb) {          /* Async */
 504                 if (when == SUBMIT)
 505                         dev_info(&udev->dev, "userurb %px, ep%d %s-%s, "
 506                                         "length %u\n",
 507                                         userurb, ep, t, d, length);
 508                 else
 509                         dev_info(&udev->dev, "userurb %px, ep%d %s-%s, "
 510                                         "actual_length %u status %d\n",
 511                                         userurb, ep, t, d, length,
 512                                         timeout_or_status);
 513         } else {
 514                 if (when == SUBMIT)
 515                         dev_info(&udev->dev, "ep%d %s-%s, length %u, "
 516                                         "timeout %d\n",
 517                                         ep, t, d, length, timeout_or_status);
 518                 else
 519                         dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
 520                                         "status %d\n",
 521                                         ep, t, d, length, timeout_or_status);
 522         }
 523
 524         data_len = min(data_len, usbfs_snoop_max);
 525         if (data && data_len > 0) {
 526                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 527                         data, data_len, 1);
 528         }
 529 }
 530
 531 static void snoop_urb_data(struct urb *urb, unsigned len)
 532 {
 533         int i, size;
 534
 535         len = min(len, usbfs_snoop_max);
 536         if (!usbfs_snoop || len == 0)
 537                 return;
 538
 539         if (urb->num_sgs == 0) {
 540                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 541                         urb->transfer_buffer, len, 1);
 542                 return;
 543         }
 544
 545         for (i = 0; i < urb->num_sgs && len; i++) {
 546                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
 547                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 548                         sg_virt(&urb->sg[i]), size, 1);
 549                 len -= size;
 550         }
 551 }
 552
 553 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
 554 {
 555         unsigned i, len, size;
 556
 557         if (urb->number_of_packets > 0)         /* Isochronous */
 558                 len = urb->transfer_buffer_length;
 559         else                                    /* Non-Isoc */
 560                 len = urb->actual_length;
 561
 562         if (urb->num_sgs == 0) {
 563                 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
 564                         return -EFAULT;
 565                 return 0;
 566         }
 567
 568         for (i = 0; i < urb->num_sgs && len; i++) {
 569                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
 570                 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
 571                         return -EFAULT;
 572                 userbuffer += size;
 573                 len -= size;
 574         }
 575
 576         return 0;
 577 }
 578
 579 #define AS_CONTINUATION 1
 580 #define AS_UNLINK       2
 581
 582 static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
 583 __releases(ps->lock)
 584 __acquires(ps->lock)
 585 {
 586         struct urb *urb;
 587         struct async *as;
 588
 589         /* Mark all the pending URBs that match bulk_addr, up to but not
 590          * including the first one without AS_CONTINUATION.  If such an
 591          * URB is encountered then a new transfer has already started so
 592          * the endpoint doesn't need to be disabled; otherwise it does.
 593          */
 594         list_for_each_entry(as, &ps->async_pending, asynclist) {
 595                 if (as->bulk_addr == bulk_addr) {
 596                         if (as->bulk_status != AS_CONTINUATION)
 597                                 goto rescan;
 598                         as->bulk_status = AS_UNLINK;
 599                         as->bulk_addr = 0;
 600                 }
 601         }
 602         ps->disabled_bulk_eps |= (1 << bulk_addr);
 603
 604         /* Now carefully unlink all the marked pending URBs */
 605  rescan:
 606         list_for_each_entry_reverse(as, &ps->async_pending, asynclist) {
 607                 if (as->bulk_status == AS_UNLINK) {
 608                         as->bulk_status = 0;            /* Only once */
 609                         urb = as->urb;
 610                         usb_get_urb(urb);
 611                         spin_unlock(&ps->lock);         /* Allow completions */
 612                         usb_unlink_urb(urb);
 613                         usb_put_urb(urb);
 614                         spin_lock(&ps->lock);
 615                         goto rescan;
 616                 }
 617         }
 618 }
 619
 620 static void async_completed(struct urb *urb)
 621 {
 622         struct async *as = urb->context;
 623         struct usb_dev_state *ps = as->ps;
 624         struct pid *pid = NULL;
 625         const struct cred *cred = NULL;
 626         unsigned long flags;
 627         sigval_t addr;
 628         int signr, errno;
 629
 630         spin_lock_irqsave(&ps->lock, flags);
 631         list_move_tail(&as->asynclist, &ps->async_completed);
 632         as->status = urb->status;
 633         signr = as->signr;
 634         if (signr) {
 635                 errno = as->status;
 636                 addr = as->userurb_sigval;
 637                 pid = get_pid(as->pid);
 638                 cred = get_cred(as->cred);
 639         }
 640         snoop(&urb->dev->dev, "urb complete\n");
 641         snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
 642                         as->status, COMPLETE, NULL, 0);
 643         if (usb_urb_dir_in(urb))
 644                 snoop_urb_data(urb, urb->actual_length);
 645
 646         if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
 647                         as->status != -ENOENT)
 648                 cancel_bulk_urbs(ps, as->bulk_addr);
 649
 650         wake_up(&ps->wait);
 651         spin_unlock_irqrestore(&ps->lock, flags);
 652
 653         if (signr) {
 654                 kill_pid_usb_asyncio(signr, errno, addr, pid, cred);
 655                 put_pid(pid);
 656                 put_cred(cred);
 657         }
 658 }
 659
 660 static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
 661 {
 662         struct urb *urb;
 663         struct async *as;
 664         unsigned long flags;
 665
 666         spin_lock_irqsave(&ps->lock, flags);
 667         while (!list_empty(list)) {
 668                 as = list_last_entry(list, struct async, asynclist);
 669                 list_del_init(&as->asynclist);
 670                 urb = as->urb;
 671                 usb_get_urb(urb);
 672
 673                 /* drop the spinlock so the completion handler can run */
 674                 spin_unlock_irqrestore(&ps->lock, flags);
 675                 usb_kill_urb(urb);
 676                 usb_put_urb(urb);
 677                 spin_lock_irqsave(&ps->lock, flags);
 678         }
 679         spin_unlock_irqrestore(&ps->lock, flags);
 680 }
 681
 682 static void destroy_async_on_interface(struct usb_dev_state *ps,
 683                                        unsigned int ifnum)
 684 {
 685         struct list_head *p, *q, hitlist;
 686         unsigned long flags;
 687
 688         INIT_LIST_HEAD(&hitlist);
 689         spin_lock_irqsave(&ps->lock, flags);
 690         list_for_each_safe(p, q, &ps->async_pending)
 691                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 692                         list_move_tail(p, &hitlist);
 693         spin_unlock_irqrestore(&ps->lock, flags);
 694         destroy_async(ps, &hitlist);
 695 }
 696
 697 static void destroy_all_async(struct usb_dev_state *ps)
 698 {
 699         destroy_async(ps, &ps->async_pending);
 700 }
 701
 702 /*
 703  * interface claims are made only at the request of user level code,
 704  * which can also release them (explicitly or by closing files).
 705  * they're also undone when devices disconnect.
 706  */
 707
 708 static int driver_probe(struct usb_interface *intf,
 709                         const struct usb_device_id *id)
 710 {
 711         return -ENODEV;
 712 }
 713
 714 static void driver_disconnect(struct usb_interface *intf)
 715 {
 716         struct usb_dev_state *ps = usb_get_intfdata(intf);
 717         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 718
 719         if (!ps)
 720                 return;
 721
 722         /* NOTE:  this relies on usbcore having canceled and completed
 723          * all pending I/O requests; 2.6 does that.
 724          */
 725
 726         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 727                 clear_bit(ifnum, &ps->ifclaimed);
 728         else
 729                 dev_warn(&intf->dev, "interface number %u out of range\n",
 730                          ifnum);
 731
 732         usb_set_intfdata(intf, NULL);
 733
 734         /* force async requests to complete */
 735         destroy_async_on_interface(ps, ifnum);
 736 }
 737
 738 /* We don't care about suspend/resume of claimed interfaces */
 739 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
 740 {
 741         return 0;
 742 }
 743
 744 static int driver_resume(struct usb_interface *intf)
 745 {
 746         return 0;
 747 }
 748
 749 #ifdef CONFIG_PM
 750 /* The following routines apply to the entire device, not interfaces */
 751 void usbfs_notify_suspend(struct usb_device *udev)
 752 {
 753         /* We don't need to handle this */
 754 }
 755
 756 void usbfs_notify_resume(struct usb_device *udev)
 757 {
 758         struct usb_dev_state *ps;
 759
 760         /* Protect against simultaneous remove or release */
 761         mutex_lock(&usbfs_mutex);
 762         list_for_each_entry(ps, &udev->filelist, list) {
 763                 WRITE_ONCE(ps->not_yet_resumed, 0);
 764                 wake_up_all(&ps->wait_for_resume);
 765         }
 766         mutex_unlock(&usbfs_mutex);
 767 }
 768 #endif
 769
 770 struct usb_driver usbfs_driver = {
 771         .name =         "usbfs",
 772         .probe =        driver_probe,
 773         .disconnect =   driver_disconnect,
 774         .suspend =      driver_suspend,
 775         .resume =       driver_resume,
 776         .supports_autosuspend = 1,
 777 };
 778
 779 static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
 780 {
 781         struct usb_device *dev = ps->dev;
 782         struct usb_interface *intf;
 783         int err;
 784
 785         if (ifnum >= 8*sizeof(ps->ifclaimed))
 786                 return -EINVAL;
 787         /* already claimed */
 788         if (test_bit(ifnum, &ps->ifclaimed))
 789                 return 0;
 790
 791         if (ps->privileges_dropped &&
 792                         !test_bit(ifnum, &ps->interface_allowed_mask))
 793                 return -EACCES;
 794
 795         intf = usb_ifnum_to_if(dev, ifnum);
 796         if (!intf)
 797                 err = -ENOENT;
 798         else {
 799                 unsigned int old_suppress;
 800
 801                 /* suppress uevents while claiming interface */
 802                 old_suppress = dev_get_uevent_suppress(&intf->dev);
 803                 dev_set_uevent_suppress(&intf->dev, 1);
 804                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 805                 dev_set_uevent_suppress(&intf->dev, old_suppress);
 806         }
 807         if (err == 0)
 808                 set_bit(ifnum, &ps->ifclaimed);
 809         return err;
 810 }
 811
 812 static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
 813 {
 814         struct usb_device *dev;
 815         struct usb_interface *intf;
 816         int err;
 817
 818         err = -EINVAL;
 819         if (ifnum >= 8*sizeof(ps->ifclaimed))
 820                 return err;
 821         dev = ps->dev;
 822         intf = usb_ifnum_to_if(dev, ifnum);
 823         if (!intf)
 824                 err = -ENOENT;
 825         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 826                 unsigned int old_suppress;
 827
 828                 /* suppress uevents while releasing interface */
 829                 old_suppress = dev_get_uevent_suppress(&intf->dev);
 830                 dev_set_uevent_suppress(&intf->dev, 1);
 831                 usb_driver_release_interface(&usbfs_driver, intf);
 832                 dev_set_uevent_suppress(&intf->dev, old_suppress);
 833                 err = 0;
 834         }
 835         return err;
 836 }
 837
 838 static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
 839 {
 840         if (ps->dev->state != USB_STATE_CONFIGURED)
 841                 return -EHOSTUNREACH;
 842         if (ifnum >= 8*sizeof(ps->ifclaimed))
 843                 return -EINVAL;
 844         if (test_bit(ifnum, &ps->ifclaimed))
 845                 return 0;
 846         /* if not yet claimed, claim it for the driver */
 847         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
 848                  "interface %u before use\n", task_pid_nr(current),
 849                  current->comm, ifnum);
 850         return claimintf(ps, ifnum);
 851 }
 852
 853 static int findintfep(struct usb_device *dev, unsigned int ep)
 854 {
 855         unsigned int i, j, e;
 856         struct usb_interface *intf;
 857         struct usb_host_interface *alts;
 858         struct usb_endpoint_descriptor *endpt;
 859
 860         if (ep & ~(USB_DIR_IN|0xf))
 861                 return -EINVAL;
 862         if (!dev->actconfig)
 863                 return -ESRCH;
 864         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 865                 intf = dev->actconfig->interface[i];
 866                 for (j = 0; j < intf->num_altsetting; j++) {
 867                         alts = &intf->altsetting[j];
 868                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 869                                 endpt = &alts->endpoint[e].desc;
 870                                 if (endpt->bEndpointAddress == ep)
 871                                         return alts->desc.bInterfaceNumber;
 872                         }
 873                 }
 874         }
 875         return -ENOENT;
 876 }
 877
 878 static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
 879                            unsigned int request, unsigned int index)
 880 {
 881         int ret = 0;
 882         struct usb_host_interface *alt_setting;
 883
 884         if (ps->dev->state != USB_STATE_UNAUTHENTICATED
 885          && ps->dev->state != USB_STATE_ADDRESS
 886          && ps->dev->state != USB_STATE_CONFIGURED)
 887                 return -EHOSTUNREACH;
 888         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 889                 return 0;
 890
 891         /*
 892          * check for the special corner case 'get_device_id' in the printer
 893          * class specification, which we always want to allow as it is used
 894          * to query things like ink level, etc.
 895          */
 896         if (requesttype == 0xa1 && request == 0) {
 897                 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
 898                                                    index >> 8, index & 0xff);
 899                 if (alt_setting
 900                  && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
 901                         return 0;
 902         }
 903
 904         index &= 0xff;
 905         switch (requesttype & USB_RECIP_MASK) {
 906         case USB_RECIP_ENDPOINT:
 907                 if ((index & ~USB_DIR_IN) == 0)
 908                         return 0;
 909                 ret = findintfep(ps->dev, index);
 910                 if (ret < 0) {
 911                         /*
 912                          * Some not fully compliant Win apps seem to get
 913                          * index wrong and have the endpoint number here
 914                          * rather than the endpoint address (with the
 915                          * correct direction). Win does let this through,
 916                          * so we'll not reject it here but leave it to
 917                          * the device to not break KVM. But we warn.
 918                          */
 919                         ret = findintfep(ps->dev, index ^ 0x80);
 920                         if (ret >= 0)
 921                                 dev_info(&ps->dev->dev,
 922                                         "%s: process %i (%s) requesting ep %02x but needs %02x\n",
 923                                         __func__, task_pid_nr(current),
 924                                         current->comm, index, index ^ 0x80);
 925                 }
 926                 if (ret >= 0)
 927                         ret = checkintf(ps, ret);
 928                 break;
 929
 930         case USB_RECIP_INTERFACE:
 931                 ret = checkintf(ps, index);
 932                 break;
 933         }
 934         return ret;
 935 }
 936
 937 static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
 938                                                      unsigned char ep)
 939 {
 940         if (ep & USB_ENDPOINT_DIR_MASK)
 941                 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
 942         else
 943                 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
 944 }
 945
 946 static int parse_usbdevfs_streams(struct usb_dev_state *ps,
 947                                   struct usbdevfs_streams __user *streams,
 948                                   unsigned int *num_streams_ret,
 949                                   unsigned int *num_eps_ret,
 950                                   struct usb_host_endpoint ***eps_ret,
 951                                   struct usb_interface **intf_ret)
 952 {
 953         unsigned int i, num_streams, num_eps;
 954         struct usb_host_endpoint **eps;
 955         struct usb_interface *intf = NULL;
 956         unsigned char ep;
 957         int ifnum, ret;
 958
 959         if (get_user(num_streams, &streams->num_streams) ||
 960             get_user(num_eps, &streams->num_eps))
 961                 return -EFAULT;
 962
 963         if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
 964                 return -EINVAL;
 965
 966         /* The XHCI controller allows max 2 ^ 16 streams */
 967         if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
 968                 return -EINVAL;
 969
 970         eps = kmalloc_array(num_eps, sizeof(*eps), GFP_KERNEL);
 971         if (!eps)
 972                 return -ENOMEM;
 973
 974         for (i = 0; i < num_eps; i++) {
 975                 if (get_user(ep, &streams->eps[i])) {
 976                         ret = -EFAULT;
 977                         goto error;
 978                 }
 979                 eps[i] = ep_to_host_endpoint(ps->dev, ep);
 980                 if (!eps[i]) {
 981                         ret = -EINVAL;
 982                         goto error;
 983                 }
 984
 985                 /* usb_alloc/free_streams operate on an usb_interface */
 986                 ifnum = findintfep(ps->dev, ep);
 987                 if (ifnum < 0) {
 988                         ret = ifnum;
 989                         goto error;
 990                 }
 991
 992                 if (i == 0) {
 993                         ret = checkintf(ps, ifnum);
 994                         if (ret < 0)
 995                                 goto error;
 996                         intf = usb_ifnum_to_if(ps->dev, ifnum);
 997                 } else {
 998                         /* Verify all eps belong to the same interface */
 999                         if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
1000                                 ret = -EINVAL;
1001                                 goto error;
1002                         }
1003                 }
1004         }
1005
1006         if (num_streams_ret)
1007                 *num_streams_ret = num_streams;
1008         *num_eps_ret = num_eps;
1009         *eps_ret = eps;
1010         *intf_ret = intf;
1011
1012         return 0;
1013
1014 error:
1015         kfree(eps);
1016         return ret;
1017 }
1018
1019 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
1020 {
1021         struct device *dev;
1022
1023         dev = bus_find_device_by_devt(&usb_bus_type, devt);
1024         if (!dev)
1025                 return NULL;
1026         return to_usb_device(dev);
1027 }
1028
1029 /*
1030  * file operations
1031  */
1032 static int usbdev_open(struct inode *inode, struct file *file)
1033 {
1034         struct usb_device *dev = NULL;
1035         struct usb_dev_state *ps;
1036         int ret;
1037
1038         ret = -ENOMEM;
1039         ps = kzalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
1040         if (!ps)
1041                 goto out_free_ps;
1042
1043         ret = -ENODEV;
1044
1045         /* usbdev device-node */
1046         if (imajor(inode) == USB_DEVICE_MAJOR)
1047                 dev = usbdev_lookup_by_devt(inode->i_rdev);
1048         if (!dev)
1049                 goto out_free_ps;
1050
1051         usb_lock_device(dev);
1052         if (dev->state == USB_STATE_NOTATTACHED)
1053                 goto out_unlock_device;
1054
1055         ret = usb_autoresume_device(dev);
1056         if (ret)
1057                 goto out_unlock_device;
1058
1059         ps->dev = dev;
1060         ps->file = file;
1061         ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
1062         spin_lock_init(&ps->lock);
1063         INIT_LIST_HEAD(&ps->list);
1064         INIT_LIST_HEAD(&ps->async_pending);
1065         INIT_LIST_HEAD(&ps->async_completed);
1066         INIT_LIST_HEAD(&ps->memory_list);
1067         init_waitqueue_head(&ps->wait);
1068         init_waitqueue_head(&ps->wait_for_resume);
1069         ps->disc_pid = get_pid(task_pid(current));
1070         ps->cred = get_current_cred();
1071         smp_wmb();
1072
1073         /* Can't race with resume; the device is already active */
1074         list_add_tail(&ps->list, &dev->filelist);
1075         file->private_data = ps;
1076         usb_unlock_device(dev);
1077         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
1078                         current->comm);
1079         return ret;
1080
1081  out_unlock_device:
1082         usb_unlock_device(dev);
1083         usb_put_dev(dev);
1084  out_free_ps:
1085         kfree(ps);
1086         return ret;
1087 }
1088
1089 static int usbdev_release(struct inode *inode, struct file *file)
1090 {
1091         struct usb_dev_state *ps = file->private_data;
1092         struct usb_device *dev = ps->dev;
1093         unsigned int ifnum;
1094         struct async *as;
1095
1096         usb_lock_device(dev);
1097         usb_hub_release_all_ports(dev, ps);
1098
1099         /* Protect against simultaneous resume */
1100         mutex_lock(&usbfs_mutex);
1101         list_del_init(&ps->list);
1102         mutex_unlock(&usbfs_mutex);
1103
1104         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
1105                         ifnum++) {
1106                 if (test_bit(ifnum, &ps->ifclaimed))
1107                         releaseintf(ps, ifnum);
1108         }
1109         destroy_all_async(ps);
1110         if (!ps->suspend_allowed)
1111                 usb_autosuspend_device(dev);
1112         usb_unlock_device(dev);
1113         usb_put_dev(dev);
1114         put_pid(ps->disc_pid);
1115         put_cred(ps->cred);
1116
1117         as = async_getcompleted(ps);
1118         while (as) {
1119                 free_async(as);
1120                 as = async_getcompleted(ps);
1121         }
1122
1123         kfree(ps);
1124         return 0;
1125 }
1126
1127 static void usbfs_blocking_completion(struct urb *urb)
1128 {
1129         complete((struct completion *) urb->context);
1130 }
1131
1132 /*
1133  * Much like usb_start_wait_urb, but returns status separately from
1134  * actual_length and uses a killable wait.
1135  */
1136 static int usbfs_start_wait_urb(struct urb *urb, int timeout,
1137                 unsigned int *actlen)
1138 {
1139         DECLARE_COMPLETION_ONSTACK(ctx);
1140         unsigned long expire;
1141         int rc;
1142
1143         urb->context = &ctx;
1144         urb->complete = usbfs_blocking_completion;
1145         *actlen = 0;
1146         rc = usb_submit_urb(urb, GFP_KERNEL);
1147         if (unlikely(rc))
1148                 return rc;
1149
1150         expire = (timeout ? msecs_to_jiffies(timeout) : MAX_SCHEDULE_TIMEOUT);
1151         rc = wait_for_completion_killable_timeout(&ctx, expire);
1152         if (rc <= 0) {
1153                 usb_kill_urb(urb);
1154                 *actlen = urb->actual_length;
1155                 if (urb->status != -ENOENT)
1156                         ;       /* Completed before it was killed */
1157                 else if (rc < 0)
1158                         return -EINTR;
1159                 else
1160                         return -ETIMEDOUT;
1161         }
1162         *actlen = urb->actual_length;
1163         return urb->status;
1164 }
1165
1166 static int do_proc_control(struct usb_dev_state *ps,
1167                 struct usbdevfs_ctrltransfer *ctrl)
1168 {
1169         struct usb_device *dev = ps->dev;
1170         unsigned int tmo;
1171         unsigned char *tbuf;
1172         unsigned int wLength, actlen;
1173         int i, pipe, ret;
1174         struct urb *urb = NULL;
1175         struct usb_ctrlrequest *dr = NULL;
1176
1177         ret = check_ctrlrecip(ps, ctrl->bRequestType, ctrl->bRequest,
1178                               ctrl->wIndex);
1179         if (ret)
1180                 return ret;
1181         wLength = ctrl->wLength;        /* To suppress 64k PAGE_SIZE warning */
1182         if (wLength > PAGE_SIZE)
1183                 return -EINVAL;
1184         ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1185                         sizeof(struct usb_ctrlrequest));
1186         if (ret)
1187                 return ret;
1188
1189         ret = -ENOMEM;
1190         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1191         if (!tbuf)
1192                 goto done;
1193         urb = usb_alloc_urb(0, GFP_NOIO);
1194         if (!urb)
1195                 goto done;
1196         dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_NOIO);
1197         if (!dr)
1198                 goto done;
1199
1200         dr->bRequestType = ctrl->bRequestType;
1201         dr->bRequest = ctrl->bRequest;
1202         dr->wValue = cpu_to_le16(ctrl->wValue);
1203         dr->wIndex = cpu_to_le16(ctrl->wIndex);
1204         dr->wLength = cpu_to_le16(ctrl->wLength);
1205
1206         tmo = ctrl->timeout;
1207         snoop(&dev->dev, "control urb: bRequestType=%02x "
1208                 "bRequest=%02x wValue=%04x "
1209                 "wIndex=%04x wLength=%04x\n",
1210                 ctrl->bRequestType, ctrl->bRequest, ctrl->wValue,
1211                 ctrl->wIndex, ctrl->wLength);
1212
1213         if ((ctrl->bRequestType & USB_DIR_IN) && wLength) {
1214                 pipe = usb_rcvctrlpipe(dev, 0);
1215                 usb_fill_control_urb(urb, dev, pipe, (unsigned char *) dr, tbuf,
1216                                 wLength, NULL, NULL);
1217                 snoop_urb(dev, NULL, pipe, wLength, tmo, SUBMIT, NULL, 0);
1218
1219                 usb_unlock_device(dev);
1220                 i = usbfs_start_wait_urb(urb, tmo, &actlen);
1221
1222                 /* Linger a bit, prior to the next control message. */
1223                 if (dev->quirks & USB_QUIRK_DELAY_CTRL_MSG)
1224                         msleep(200);
1225                 usb_lock_device(dev);
1226                 snoop_urb(dev, NULL, pipe, actlen, i, COMPLETE, tbuf, actlen);
1227                 if (!i && actlen) {
1228                         if (copy_to_user(ctrl->data, tbuf, actlen)) {
1229                                 ret = -EFAULT;
1230                                 goto done;
1231                         }
1232                 }
1233         } else {
1234                 if (wLength) {
1235                         if (copy_from_user(tbuf, ctrl->data, wLength)) {
1236                                 ret = -EFAULT;
1237                                 goto done;
1238                         }
1239                 }
1240                 pipe = usb_sndctrlpipe(dev, 0);
1241                 usb_fill_control_urb(urb, dev, pipe, (unsigned char *) dr, tbuf,
1242                                 wLength, NULL, NULL);
1243                 snoop_urb(dev, NULL, pipe, wLength, tmo, SUBMIT, tbuf, wLength);
1244
1245                 usb_unlock_device(dev);
1246                 i = usbfs_start_wait_urb(urb, tmo, &actlen);
1247
1248                 /* Linger a bit, prior to the next control message. */
1249                 if (dev->quirks & USB_QUIRK_DELAY_CTRL_MSG)
1250                         msleep(200);
1251                 usb_lock_device(dev);
1252                 snoop_urb(dev, NULL, pipe, actlen, i, COMPLETE, NULL, 0);
1253         }
1254         if (i < 0 && i != -EPIPE) {
1255                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1256                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
1257                            current->comm, ctrl->bRequestType, ctrl->bRequest,
1258                            ctrl->wLength, i);
1259         }
1260         ret = (i < 0 ? i : actlen);
1261
1262  done:
1263         kfree(dr);
1264         usb_free_urb(urb);
1265         free_page((unsigned long) tbuf);
1266         usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1267                         sizeof(struct usb_ctrlrequest));
1268         return ret;
1269 }
1270
1271 static int proc_control(struct usb_dev_state *ps, void __user *arg)
1272 {
1273         struct usbdevfs_ctrltransfer ctrl;
1274
1275         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1276                 return -EFAULT;
1277         return do_proc_control(ps, &ctrl);
1278 }
1279
1280 static int do_proc_bulk(struct usb_dev_state *ps,
1281                 struct usbdevfs_bulktransfer *bulk)
1282 {
1283         struct usb_device *dev = ps->dev;
1284         unsigned int tmo, len1, len2, pipe;
1285         unsigned char *tbuf;
1286         int i, ret;
1287         struct urb *urb = NULL;
1288         struct usb_host_endpoint *ep;
1289
1290         ret = findintfep(ps->dev, bulk->ep);
1291         if (ret < 0)
1292                 return ret;
1293         ret = checkintf(ps, ret);
1294         if (ret)
1295                 return ret;
1296
1297         len1 = bulk->len;
1298         if (len1 < 0 || len1 >= (INT_MAX - sizeof(struct urb)))
1299                 return -EINVAL;
1300
1301         if (bulk->ep & USB_DIR_IN)
1302                 pipe = usb_rcvbulkpipe(dev, bulk->ep & 0x7f);
1303         else
1304                 pipe = usb_sndbulkpipe(dev, bulk->ep & 0x7f);
1305         ep = usb_pipe_endpoint(dev, pipe);
1306         if (!ep || !usb_endpoint_maxp(&ep->desc))
1307                 return -EINVAL;
1308         ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1309         if (ret)
1310                 return ret;
1311
1312         /*
1313          * len1 can be almost arbitrarily large.  Don't WARN if it's
1314          * too big, just fail the request.
1315          */
1316         ret = -ENOMEM;
1317         tbuf = kmalloc(len1, GFP_KERNEL | __GFP_NOWARN);
1318         if (!tbuf)
1319                 goto done;
1320         urb = usb_alloc_urb(0, GFP_KERNEL);
1321         if (!urb)
1322                 goto done;
1323
1324         if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
1325                         USB_ENDPOINT_XFER_INT) {
1326                 pipe = (pipe & ~(3 << 30)) | (PIPE_INTERRUPT << 30);
1327                 usb_fill_int_urb(urb, dev, pipe, tbuf, len1,
1328                                 NULL, NULL, ep->desc.bInterval);
1329         } else {
1330                 usb_fill_bulk_urb(urb, dev, pipe, tbuf, len1, NULL, NULL);
1331         }
1332
1333         tmo = bulk->timeout;
1334         if (bulk->ep & 0x80) {
1335                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1336
1337                 usb_unlock_device(dev);
1338                 i = usbfs_start_wait_urb(urb, tmo, &len2);
1339                 usb_lock_device(dev);
1340                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1341
1342                 if (!i && len2) {
1343                         if (copy_to_user(bulk->data, tbuf, len2)) {
1344                                 ret = -EFAULT;
1345                                 goto done;
1346                         }
1347                 }
1348         } else {
1349                 if (len1) {
1350                         if (copy_from_user(tbuf, bulk->data, len1)) {
1351                                 ret = -EFAULT;
1352                                 goto done;
1353                         }
1354                 }
1355                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1356
1357                 usb_unlock_device(dev);
1358                 i = usbfs_start_wait_urb(urb, tmo, &len2);
1359                 usb_lock_device(dev);
1360                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1361         }
1362         ret = (i < 0 ? i : len2);
1363  done:
1364         usb_free_urb(urb);
1365         kfree(tbuf);
1366         usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1367         return ret;
1368 }
1369
1370 static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1371 {
1372         struct usbdevfs_bulktransfer bulk;
1373
1374         if (copy_from_user(&bulk, arg, sizeof(bulk)))
1375                 return -EFAULT;
1376         return do_proc_bulk(ps, &bulk);
1377 }
1378
1379 static void check_reset_of_active_ep(struct usb_device *udev,
1380                 unsigned int epnum, char *ioctl_name)
1381 {
1382         struct usb_host_endpoint **eps;
1383         struct usb_host_endpoint *ep;
1384
1385         eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1386         ep = eps[epnum & 0x0f];
1387         if (ep && !list_empty(&ep->urb_list))
1388                 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1389                                 task_pid_nr(current), current->comm,
1390                                 ioctl_name, epnum);
1391 }
1392
1393 static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1394 {
1395         unsigned int ep;
1396         int ret;
1397
1398         if (get_user(ep, (unsigned int __user *)arg))
1399                 return -EFAULT;
1400         ret = findintfep(ps->dev, ep);
1401         if (ret < 0)
1402                 return ret;
1403         ret = checkintf(ps, ret);
1404         if (ret)
1405                 return ret;
1406         check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1407         usb_reset_endpoint(ps->dev, ep);
1408         return 0;
1409 }
1410
1411 static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1412 {
1413         unsigned int ep;
1414         int pipe;
1415         int ret;
1416
1417         if (get_user(ep, (unsigned int __user *)arg))
1418                 return -EFAULT;
1419         ret = findintfep(ps->dev, ep);
1420         if (ret < 0)
1421                 return ret;
1422         ret = checkintf(ps, ret);
1423         if (ret)
1424                 return ret;
1425         check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1426         if (ep & USB_DIR_IN)
1427                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1428         else
1429                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1430
1431         return usb_clear_halt(ps->dev, pipe);
1432 }
1433
1434 static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1435 {
1436         struct usbdevfs_getdriver gd;
1437         struct usb_interface *intf;
1438         int ret;
1439
1440         if (copy_from_user(&gd, arg, sizeof(gd)))
1441                 return -EFAULT;
1442         intf = usb_ifnum_to_if(ps->dev, gd.interface);
1443         if (!intf || !intf->dev.driver)
1444                 ret = -ENODATA;
1445         else {
1446                 strscpy(gd.driver, intf->dev.driver->name,
1447                                 sizeof(gd.driver));
1448                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1449         }
1450         return ret;
1451 }
1452
1453 static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1454 {
1455         struct usbdevfs_connectinfo ci;
1456
1457         memset(&ci, 0, sizeof(ci));
1458         ci.devnum = ps->dev->devnum;
1459         ci.slow = ps->dev->speed == USB_SPEED_LOW;
1460
1461         if (copy_to_user(arg, &ci, sizeof(ci)))
1462                 return -EFAULT;
1463         return 0;
1464 }
1465
1466 static int proc_conninfo_ex(struct usb_dev_state *ps,
1467                             void __user *arg, size_t size)
1468 {
1469         struct usbdevfs_conninfo_ex ci;
1470         struct usb_device *udev = ps->dev;
1471
1472         if (size < sizeof(ci.size))
1473                 return -EINVAL;
1474
1475         memset(&ci, 0, sizeof(ci));
1476         ci.size = sizeof(ci);
1477         ci.busnum = udev->bus->busnum;
1478         ci.devnum = udev->devnum;
1479         ci.speed = udev->speed;
1480
1481         while (udev && udev->portnum != 0) {
1482                 if (++ci.num_ports <= ARRAY_SIZE(ci.ports))
1483                         ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports] =
1484                                         udev->portnum;
1485                 udev = udev->parent;
1486         }
1487
1488         if (ci.num_ports < ARRAY_SIZE(ci.ports))
1489                 memmove(&ci.ports[0],
1490                         &ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports],
1491                         ci.num_ports);
1492
1493         if (copy_to_user(arg, &ci, min(sizeof(ci), size)))
1494                 return -EFAULT;
1495
1496         return 0;
1497 }
1498
1499 static int proc_resetdevice(struct usb_dev_state *ps)
1500 {
1501         struct usb_host_config *actconfig = ps->dev->actconfig;
1502         struct usb_interface *interface;
1503         int i, number;
1504
1505         /* Don't allow a device reset if the process has dropped the
1506          * privilege to do such things and any of the interfaces are
1507          * currently claimed.
1508          */
1509         if (ps->privileges_dropped && actconfig) {
1510                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1511                         interface = actconfig->interface[i];
1512                         number = interface->cur_altsetting->desc.bInterfaceNumber;
1513                         if (usb_interface_claimed(interface) &&
1514                                         !test_bit(number, &ps->ifclaimed)) {
1515                                 dev_warn(&ps->dev->dev,
1516                                         "usbfs: interface %d claimed by %s while '%s' resets device\n",
1517                                         number, interface->dev.driver->name, current->comm);
1518                                 return -EACCES;
1519                         }
1520                 }
1521         }
1522
1523         return usb_reset_device(ps->dev);
1524 }
1525
1526 static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1527 {
1528         struct usbdevfs_setinterface setintf;
1529         int ret;
1530
1531         if (copy_from_user(&setintf, arg, sizeof(setintf)))
1532                 return -EFAULT;
1533         ret = checkintf(ps, setintf.interface);
1534         if (ret)
1535                 return ret;
1536
1537         destroy_async_on_interface(ps, setintf.interface);
1538
1539         return usb_set_interface(ps->dev, setintf.interface,
1540                         setintf.altsetting);
1541 }
1542
1543 static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1544 {
1545         int u;
1546         int status = 0;
1547         struct usb_host_config *actconfig;
1548
1549         if (get_user(u, (int __user *)arg))
1550                 return -EFAULT;
1551
1552         actconfig = ps->dev->actconfig;
1553
1554         /* Don't touch the device if any interfaces are claimed.
1555          * It could interfere with other drivers' operations, and if
1556          * an interface is claimed by usbfs it could easily deadlock.
1557          */
1558         if (actconfig) {
1559                 int i;
1560
1561                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1562                         if (usb_interface_claimed(actconfig->interface[i])) {
1563                                 dev_warn(&ps->dev->dev,
1564                                         "usbfs: interface %d claimed by %s "
1565                                         "while '%s' sets config #%d\n",
1566                                         actconfig->interface[i]
1567                                                 ->cur_altsetting
1568                                                 ->desc.bInterfaceNumber,
1569                                         actconfig->interface[i]
1570                                                 ->dev.driver->name,
1571                                         current->comm, u);
1572                                 status = -EBUSY;
1573                                 break;
1574                         }
1575                 }
1576         }
1577
1578         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1579          * so avoid usb_set_configuration()'s kick to sysfs
1580          */
1581         if (status == 0) {
1582                 if (actconfig && actconfig->desc.bConfigurationValue == u)
1583                         status = usb_reset_configuration(ps->dev);
1584                 else
1585                         status = usb_set_configuration(ps->dev, u);
1586         }
1587
1588         return status;
1589 }
1590
1591 static struct usb_memory *
1592 find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
1593 {
1594         struct usb_memory *usbm = NULL, *iter;
1595         unsigned long flags;
1596         unsigned long uurb_start = (unsigned long)uurb->buffer;
1597
1598         spin_lock_irqsave(&ps->lock, flags);
1599         list_for_each_entry(iter, &ps->memory_list, memlist) {
1600                 if (uurb_start >= iter->vm_start &&
1601                                 uurb_start < iter->vm_start + iter->size) {
1602                         if (uurb->buffer_length > iter->vm_start + iter->size -
1603                                         uurb_start) {
1604                                 usbm = ERR_PTR(-EINVAL);
1605                         } else {
1606                                 usbm = iter;
1607                                 usbm->urb_use_count++;
1608                         }
1609                         break;
1610                 }
1611         }
1612         spin_unlock_irqrestore(&ps->lock, flags);
1613         return usbm;
1614 }
1615
1616 static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1617                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1618                         void __user *arg, sigval_t userurb_sigval)
1619 {
1620         struct usbdevfs_iso_packet_desc *isopkt = NULL;
1621         struct usb_host_endpoint *ep;
1622         struct async *as = NULL;
1623         struct usb_ctrlrequest *dr = NULL;
1624         unsigned int u, totlen, isofrmlen;
1625         int i, ret, num_sgs = 0, ifnum = -1;
1626         int number_of_packets = 0;
1627         unsigned int stream_id = 0;
1628         void *buf;
1629         bool is_in;
1630         bool allow_short = false;
1631         bool allow_zero = false;
1632         unsigned long mask =    USBDEVFS_URB_SHORT_NOT_OK |
1633                                 USBDEVFS_URB_BULK_CONTINUATION |
1634                                 USBDEVFS_URB_NO_FSBR |
1635                                 USBDEVFS_URB_ZERO_PACKET |
1636                                 USBDEVFS_URB_NO_INTERRUPT;
1637         /* USBDEVFS_URB_ISO_ASAP is a special case */
1638         if (uurb->type == USBDEVFS_URB_TYPE_ISO)
1639                 mask |= USBDEVFS_URB_ISO_ASAP;
1640
1641         if (uurb->flags & ~mask)
1642                         return -EINVAL;
1643
1644         if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
1645                 return -EINVAL;
1646         if (uurb->buffer_length > 0 && !uurb->buffer)
1647                 return -EINVAL;
1648         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1649             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1650                 ifnum = findintfep(ps->dev, uurb->endpoint);
1651                 if (ifnum < 0)
1652                         return ifnum;
1653                 ret = checkintf(ps, ifnum);
1654                 if (ret)
1655                         return ret;
1656         }
1657         ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1658         if (!ep)
1659                 return -ENOENT;
1660         is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1661
1662         u = 0;
1663         switch (uurb->type) {
1664         case USBDEVFS_URB_TYPE_CONTROL:
1665                 if (!usb_endpoint_xfer_control(&ep->desc))
1666                         return -EINVAL;
1667                 /* min 8 byte setup packet */
1668                 if (uurb->buffer_length < 8)
1669                         return -EINVAL;
1670                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1671                 if (!dr)
1672                         return -ENOMEM;
1673                 if (copy_from_user(dr, uurb->buffer, 8)) {
1674                         ret = -EFAULT;
1675                         goto error;
1676                 }
1677                 if (uurb->buffer_length < (le16_to_cpu(dr->wLength) + 8)) {
1678                         ret = -EINVAL;
1679                         goto error;
1680                 }
1681                 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1682                                       le16_to_cpu(dr->wIndex));
1683                 if (ret)
1684                         goto error;
1685                 uurb->buffer_length = le16_to_cpu(dr->wLength);
1686                 uurb->buffer += 8;
1687                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1688                         is_in = true;
1689                         uurb->endpoint |= USB_DIR_IN;
1690                 } else {
1691                         is_in = false;
1692                         uurb->endpoint &= ~USB_DIR_IN;
1693                 }
1694                 if (is_in)
1695                         allow_short = true;
1696                 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1697                         "bRequest=%02x wValue=%04x "
1698                         "wIndex=%04x wLength=%04x\n",
1699                         dr->bRequestType, dr->bRequest,
1700                         __le16_to_cpu(dr->wValue),
1701                         __le16_to_cpu(dr->wIndex),
1702                         __le16_to_cpu(dr->wLength));
1703                 u = sizeof(struct usb_ctrlrequest);
1704                 break;
1705
1706         case USBDEVFS_URB_TYPE_BULK:
1707                 if (!is_in)
1708                         allow_zero = true;
1709                 else
1710                         allow_short = true;
1711                 switch (usb_endpoint_type(&ep->desc)) {
1712                 case USB_ENDPOINT_XFER_CONTROL:
1713                 case USB_ENDPOINT_XFER_ISOC:
1714                         return -EINVAL;
1715                 case USB_ENDPOINT_XFER_INT:
1716                         /* allow single-shot interrupt transfers */
1717                         uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1718                         goto interrupt_urb;
1719                 }
1720                 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1721                 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1722                         num_sgs = 0;
1723                 if (ep->streams)
1724                         stream_id = uurb->stream_id;
1725                 break;
1726
1727         case USBDEVFS_URB_TYPE_INTERRUPT:
1728                 if (!usb_endpoint_xfer_int(&ep->desc))
1729                         return -EINVAL;
1730  interrupt_urb:
1731                 if (!is_in)
1732                         allow_zero = true;
1733                 else
1734                         allow_short = true;
1735                 break;
1736
1737         case USBDEVFS_URB_TYPE_ISO:
1738                 /* arbitrary limit */
1739                 if (uurb->number_of_packets < 1 ||
1740                     uurb->number_of_packets > 128)
1741                         return -EINVAL;
1742                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1743                         return -EINVAL;
1744                 number_of_packets = uurb->number_of_packets;
1745                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1746                                    number_of_packets;
1747                 isopkt = memdup_user(iso_frame_desc, isofrmlen);
1748                 if (IS_ERR(isopkt)) {
1749                         ret = PTR_ERR(isopkt);
1750                         isopkt = NULL;
1751                         goto error;
1752                 }
1753                 for (totlen = u = 0; u < number_of_packets; u++) {
1754                         /*
1755                          * arbitrary limit need for USB 3.1 Gen2
1756                          * sizemax: 96 DPs at SSP, 96 * 1024 = 98304
1757                          */
1758                         if (isopkt[u].length > 98304) {
1759                                 ret = -EINVAL;
1760                                 goto error;
1761                         }
1762                         totlen += isopkt[u].length;
1763                 }
1764                 u *= sizeof(struct usb_iso_packet_descriptor);
1765                 uurb->buffer_length = totlen;
1766                 break;
1767
1768         default:
1769                 return -EINVAL;
1770         }
1771
1772         if (uurb->buffer_length > 0 &&
1773                         !access_ok(uurb->buffer, uurb->buffer_length)) {
1774                 ret = -EFAULT;
1775                 goto error;
1776         }
1777         as = alloc_async(number_of_packets);
1778         if (!as) {
1779                 ret = -ENOMEM;
1780                 goto error;
1781         }
1782
1783         as->usbm = find_memory_area(ps, uurb);
1784         if (IS_ERR(as->usbm)) {
1785                 ret = PTR_ERR(as->usbm);
1786                 as->usbm = NULL;
1787                 goto error;
1788         }
1789
1790         /* do not use SG buffers when memory mapped segments
1791          * are in use
1792          */
1793         if (as->usbm)
1794                 num_sgs = 0;
1795
1796         u += sizeof(struct async) + sizeof(struct urb) +
1797              (as->usbm ? 0 : uurb->buffer_length) +
1798              num_sgs * sizeof(struct scatterlist);
1799         ret = usbfs_increase_memory_usage(u);
1800         if (ret)
1801                 goto error;
1802         as->mem_usage = u;
1803
1804         if (num_sgs) {
1805                 as->urb->sg = kmalloc_array(num_sgs,
1806                                             sizeof(struct scatterlist),
1807                                             GFP_KERNEL | __GFP_NOWARN);
1808                 if (!as->urb->sg) {
1809                         ret = -ENOMEM;
1810                         goto error;
1811                 }
1812                 as->urb->num_sgs = num_sgs;
1813                 sg_init_table(as->urb->sg, as->urb->num_sgs);
1814
1815                 totlen = uurb->buffer_length;
1816                 for (i = 0; i < as->urb->num_sgs; i++) {
1817                         u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1818                         buf = kmalloc(u, GFP_KERNEL);
1819                         if (!buf) {
1820                                 ret = -ENOMEM;
1821                                 goto error;
1822                         }
1823                         sg_set_buf(&as->urb->sg[i], buf, u);
1824
1825                         if (!is_in) {
1826                                 if (copy_from_user(buf, uurb->buffer, u)) {
1827                                         ret = -EFAULT;
1828                                         goto error;
1829                                 }
1830                                 uurb->buffer += u;
1831                         }
1832                         totlen -= u;
1833                 }
1834         } else if (uurb->buffer_length > 0) {
1835                 if (as->usbm) {
1836                         unsigned long uurb_start = (unsigned long)uurb->buffer;
1837
1838                         as->urb->transfer_buffer = as->usbm->mem +
1839                                         (uurb_start - as->usbm->vm_start);
1840                 } else {
1841                         as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1842                                         GFP_KERNEL | __GFP_NOWARN);
1843                         if (!as->urb->transfer_buffer) {
1844                                 ret = -ENOMEM;
1845                                 goto error;
1846                         }
1847                         if (!is_in) {
1848                                 if (copy_from_user(as->urb->transfer_buffer,
1849                                                    uurb->buffer,
1850                                                    uurb->buffer_length)) {
1851                                         ret = -EFAULT;
1852                                         goto error;
1853                                 }
1854                         } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1855                                 /*
1856                                  * Isochronous input data may end up being
1857                                  * discontiguous if some of the packets are
1858                                  * short. Clear the buffer so that the gaps
1859                                  * don't leak kernel data to userspace.
1860                                  */
1861                                 memset(as->urb->transfer_buffer, 0,
1862                                                 uurb->buffer_length);
1863                         }
1864                 }
1865         }
1866         as->urb->dev = ps->dev;
1867         as->urb->pipe = (uurb->type << 30) |
1868                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1869                         (uurb->endpoint & USB_DIR_IN);
1870
1871         /* This tedious sequence is necessary because the URB_* flags
1872          * are internal to the kernel and subject to change, whereas
1873          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1874          */
1875         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1876         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1877                 u |= URB_ISO_ASAP;
1878         if (allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1879                 u |= URB_SHORT_NOT_OK;
1880         if (allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1881                 u |= URB_ZERO_PACKET;
1882         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1883                 u |= URB_NO_INTERRUPT;
1884         as->urb->transfer_flags = u;
1885
1886         if (!allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1887                 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_SHORT_NOT_OK.\n");
1888         if (!allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1889                 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_ZERO_PACKET.\n");
1890
1891         as->urb->transfer_buffer_length = uurb->buffer_length;
1892         as->urb->setup_packet = (unsigned char *)dr;
1893         dr = NULL;
1894         as->urb->start_frame = uurb->start_frame;
1895         as->urb->number_of_packets = number_of_packets;
1896         as->urb->stream_id = stream_id;
1897
1898         if (ep->desc.bInterval) {
1899                 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1900                                 ps->dev->speed == USB_SPEED_HIGH ||
1901                                 ps->dev->speed >= USB_SPEED_SUPER)
1902                         as->urb->interval = 1 <<
1903                                         min(15, ep->desc.bInterval - 1);
1904                 else
1905                         as->urb->interval = ep->desc.bInterval;
1906         }
1907
1908         as->urb->context = as;
1909         as->urb->complete = async_completed;
1910         for (totlen = u = 0; u < number_of_packets; u++) {
1911                 as->urb->iso_frame_desc[u].offset = totlen;
1912                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1913                 totlen += isopkt[u].length;
1914         }
1915         kfree(isopkt);
1916         isopkt = NULL;
1917         as->ps = ps;
1918         as->userurb = arg;
1919         as->userurb_sigval = userurb_sigval;
1920         if (as->usbm) {
1921                 unsigned long uurb_start = (unsigned long)uurb->buffer;
1922
1923                 as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1924                 as->urb->transfer_dma = as->usbm->dma_handle +
1925                                 (uurb_start - as->usbm->vm_start);
1926         } else if (is_in && uurb->buffer_length > 0)
1927                 as->userbuffer = uurb->buffer;
1928         as->signr = uurb->signr;
1929         as->ifnum = ifnum;
1930         as->pid = get_pid(task_pid(current));
1931         as->cred = get_current_cred();
1932         snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1933                         as->urb->transfer_buffer_length, 0, SUBMIT,
1934                         NULL, 0);
1935         if (!is_in)
1936                 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1937
1938         async_newpending(as);
1939
1940         if (usb_endpoint_xfer_bulk(&ep->desc)) {
1941                 spin_lock_irq(&ps->lock);
1942
1943                 /* Not exactly the endpoint address; the direction bit is
1944                  * shifted to the 0x10 position so that the value will be
1945                  * between 0 and 31.
1946                  */
1947                 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1948                         ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1949                                 >> 3);
1950
1951                 /* If this bulk URB is the start of a new transfer, re-enable
1952                  * the endpoint.  Otherwise mark it as a continuation URB.
1953                  */
1954                 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1955                         as->bulk_status = AS_CONTINUATION;
1956                 else
1957                         ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1958
1959                 /* Don't accept continuation URBs if the endpoint is
1960                  * disabled because of an earlier error.
1961                  */
1962                 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1963                         ret = -EREMOTEIO;
1964                 else
1965                         ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1966                 spin_unlock_irq(&ps->lock);
1967         } else {
1968                 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1969         }
1970
1971         if (ret) {
1972                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1973                            "usbfs: usb_submit_urb returned %d\n", ret);
1974                 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1975                                 0, ret, COMPLETE, NULL, 0);
1976                 async_removepending(as);
1977                 goto error;
1978         }
1979         return 0;
1980
1981  error:
1982         kfree(isopkt);
1983         kfree(dr);
1984         if (as)
1985                 free_async(as);
1986         return ret;
1987 }
1988
1989 static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1990 {
1991         struct usbdevfs_urb uurb;
1992         sigval_t userurb_sigval;
1993
1994         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1995                 return -EFAULT;
1996
1997         memset(&userurb_sigval, 0, sizeof(userurb_sigval));
1998         userurb_sigval.sival_ptr = arg;
1999
2000         return proc_do_submiturb(ps, &uurb,
2001                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
2002                         arg, userurb_sigval);
2003 }
2004
2005 static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
2006 {
2007         struct urb *urb;
2008         struct async *as;
2009         unsigned long flags;
2010
2011         spin_lock_irqsave(&ps->lock, flags);
2012         as = async_getpending(ps, arg);
2013         if (!as) {
2014                 spin_unlock_irqrestore(&ps->lock, flags);
2015                 return -EINVAL;
2016         }
2017
2018         urb = as->urb;
2019         usb_get_urb(urb);
2020         spin_unlock_irqrestore(&ps->lock, flags);
2021
2022         usb_kill_urb(urb);
2023         usb_put_urb(urb);
2024
2025         return 0;
2026 }
2027
2028 static void compute_isochronous_actual_length(struct urb *urb)
2029 {
2030         unsigned int i;
2031
2032         if (urb->number_of_packets > 0) {
2033                 urb->actual_length = 0;
2034                 for (i = 0; i < urb->number_of_packets; i++)
2035                         urb->actual_length +=
2036                                         urb->iso_frame_desc[i].actual_length;
2037         }
2038 }
2039
2040 static int processcompl(struct async *as, void __user * __user *arg)
2041 {
2042         struct urb *urb = as->urb;
2043         struct usbdevfs_urb __user *userurb = as->userurb;
2044         void __user *addr = as->userurb;
2045         unsigned int i;
2046
2047         compute_isochronous_actual_length(urb);
2048         if (as->userbuffer && urb->actual_length) {
2049                 if (copy_urb_data_to_user(as->userbuffer, urb))
2050                         goto err_out;
2051         }
2052         if (put_user(as->status, &userurb->status))
2053                 goto err_out;
2054         if (put_user(urb->actual_length, &userurb->actual_length))
2055                 goto err_out;
2056         if (put_user(urb->error_count, &userurb->error_count))
2057                 goto err_out;
2058
2059         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2060                 for (i = 0; i < urb->number_of_packets; i++) {
2061                         if (put_user(urb->iso_frame_desc[i].actual_length,
2062                                      &userurb->iso_frame_desc[i].actual_length))
2063                                 goto err_out;
2064                         if (put_user(urb->iso_frame_desc[i].status,
2065                                      &userurb->iso_frame_desc[i].status))
2066                                 goto err_out;
2067                 }
2068         }
2069
2070         if (put_user(addr, (void __user * __user *)arg))
2071                 return -EFAULT;
2072         return 0;
2073
2074 err_out:
2075         return -EFAULT;
2076 }
2077
2078 static struct async *reap_as(struct usb_dev_state *ps)
2079 {
2080         DECLARE_WAITQUEUE(wait, current);
2081         struct async *as = NULL;
2082         struct usb_device *dev = ps->dev;
2083
2084         add_wait_queue(&ps->wait, &wait);
2085         for (;;) {
2086                 __set_current_state(TASK_INTERRUPTIBLE);
2087                 as = async_getcompleted(ps);
2088                 if (as || !connected(ps))
2089                         break;
2090                 if (signal_pending(current))
2091                         break;
2092                 usb_unlock_device(dev);
2093                 schedule();
2094                 usb_lock_device(dev);
2095         }
2096         remove_wait_queue(&ps->wait, &wait);
2097         set_current_state(TASK_RUNNING);
2098         return as;
2099 }
2100
2101 static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
2102 {
2103         struct async *as = reap_as(ps);
2104
2105         if (as) {
2106                 int retval;
2107
2108                 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2109                 retval = processcompl(as, (void __user * __user *)arg);
2110                 free_async(as);
2111                 return retval;
2112         }
2113         if (signal_pending(current))
2114                 return -EINTR;
2115         return -ENODEV;
2116 }
2117
2118 static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
2119 {
2120         int retval;
2121         struct async *as;
2122
2123         as = async_getcompleted(ps);
2124         if (as) {
2125                 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2126                 retval = processcompl(as, (void __user * __user *)arg);
2127                 free_async(as);
2128         } else {
2129                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2130         }
2131         return retval;
2132 }
2133
2134 #ifdef CONFIG_COMPAT
2135 static int proc_control_compat(struct usb_dev_state *ps,
2136                                 struct usbdevfs_ctrltransfer32 __user *p32)
2137 {
2138         struct usbdevfs_ctrltransfer ctrl;
2139         u32 udata;
2140
2141         if (copy_from_user(&ctrl, p32, sizeof(*p32) - sizeof(compat_caddr_t)) ||
2142             get_user(udata, &p32->data))
2143                 return -EFAULT;
2144         ctrl.data = compat_ptr(udata);
2145         return do_proc_control(ps, &ctrl);
2146 }
2147
2148 static int proc_bulk_compat(struct usb_dev_state *ps,
2149                         struct usbdevfs_bulktransfer32 __user *p32)
2150 {
2151         struct usbdevfs_bulktransfer bulk;
2152         compat_caddr_t addr;
2153
2154         if (get_user(bulk.ep, &p32->ep) ||
2155             get_user(bulk.len, &p32->len) ||
2156             get_user(bulk.timeout, &p32->timeout) ||
2157             get_user(addr, &p32->data))
2158                 return -EFAULT;
2159         bulk.data = compat_ptr(addr);
2160         return do_proc_bulk(ps, &bulk);
2161 }
2162
2163 static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
2164 {
2165         struct usbdevfs_disconnectsignal32 ds;
2166
2167         if (copy_from_user(&ds, arg, sizeof(ds)))
2168                 return -EFAULT;
2169         ps->discsignr = ds.signr;
2170         ps->disccontext.sival_int = ds.context;
2171         return 0;
2172 }
2173
2174 static int get_urb32(struct usbdevfs_urb *kurb,
2175                      struct usbdevfs_urb32 __user *uurb)
2176 {
2177         struct usbdevfs_urb32 urb32;
2178         if (copy_from_user(&urb32, uurb, sizeof(*uurb)))
2179                 return -EFAULT;
2180         kurb->type = urb32.type;
2181         kurb->endpoint = urb32.endpoint;
2182         kurb->status = urb32.status;
2183         kurb->flags = urb32.flags;
2184         kurb->buffer = compat_ptr(urb32.buffer);
2185         kurb->buffer_length = urb32.buffer_length;
2186         kurb->actual_length = urb32.actual_length;
2187         kurb->start_frame = urb32.start_frame;
2188         kurb->number_of_packets = urb32.number_of_packets;
2189         kurb->error_count = urb32.error_count;
2190         kurb->signr = urb32.signr;
2191         kurb->usercontext = compat_ptr(urb32.usercontext);
2192         return 0;
2193 }
2194
2195 static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
2196 {
2197         struct usbdevfs_urb uurb;
2198         sigval_t userurb_sigval;
2199
2200         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
2201                 return -EFAULT;
2202
2203         memset(&userurb_sigval, 0, sizeof(userurb_sigval));
2204         userurb_sigval.sival_int = ptr_to_compat(arg);
2205
2206         return proc_do_submiturb(ps, &uurb,
2207                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
2208                         arg, userurb_sigval);
2209 }
2210
2211 static int processcompl_compat(struct async *as, void __user * __user *arg)
2212 {
2213         struct urb *urb = as->urb;
2214         struct usbdevfs_urb32 __user *userurb = as->userurb;
2215         void __user *addr = as->userurb;
2216         unsigned int i;
2217
2218         compute_isochronous_actual_length(urb);
2219         if (as->userbuffer && urb->actual_length) {
2220                 if (copy_urb_data_to_user(as->userbuffer, urb))
2221                         return -EFAULT;
2222         }
2223         if (put_user(as->status, &userurb->status))
2224                 return -EFAULT;
2225         if (put_user(urb->actual_length, &userurb->actual_length))
2226                 return -EFAULT;
2227         if (put_user(urb->error_count, &userurb->error_count))
2228                 return -EFAULT;
2229
2230         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2231                 for (i = 0; i < urb->number_of_packets; i++) {
2232                         if (put_user(urb->iso_frame_desc[i].actual_length,
2233                                      &userurb->iso_frame_desc[i].actual_length))
2234                                 return -EFAULT;
2235                         if (put_user(urb->iso_frame_desc[i].status,
2236                                      &userurb->iso_frame_desc[i].status))
2237                                 return -EFAULT;
2238                 }
2239         }
2240
2241         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2242                 return -EFAULT;
2243         return 0;
2244 }
2245
2246 static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
2247 {
2248         struct async *as = reap_as(ps);
2249
2250         if (as) {
2251                 int retval;
2252
2253                 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2254                 retval = processcompl_compat(as, (void __user * __user *)arg);
2255                 free_async(as);
2256                 return retval;
2257         }
2258         if (signal_pending(current))
2259                 return -EINTR;
2260         return -ENODEV;
2261 }
2262
2263 static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
2264 {
2265         int retval;
2266         struct async *as;
2267
2268         as = async_getcompleted(ps);
2269         if (as) {
2270                 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2271                 retval = processcompl_compat(as, (void __user * __user *)arg);
2272                 free_async(as);
2273         } else {
2274                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2275         }
2276         return retval;
2277 }
2278
2279
2280 #endif
2281
2282 static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
2283 {
2284         struct usbdevfs_disconnectsignal ds;
2285
2286         if (copy_from_user(&ds, arg, sizeof(ds)))
2287                 return -EFAULT;
2288         ps->discsignr = ds.signr;
2289         ps->disccontext.sival_ptr = ds.context;
2290         return 0;
2291 }
2292
2293 static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
2294 {
2295         unsigned int ifnum;
2296
2297         if (get_user(ifnum, (unsigned int __user *)arg))
2298                 return -EFAULT;
2299         return claimintf(ps, ifnum);
2300 }
2301
2302 static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
2303 {
2304         unsigned int ifnum;
2305         int ret;
2306
2307         if (get_user(ifnum, (unsigned int __user *)arg))
2308                 return -EFAULT;
2309         ret = releaseintf(ps, ifnum);
2310         if (ret < 0)
2311                 return ret;
2312         destroy_async_on_interface(ps, ifnum);
2313         return 0;
2314 }
2315
2316 static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
2317 {
2318         int                     size;
2319         void                    *buf = NULL;
2320         int                     retval = 0;
2321         struct usb_interface    *intf = NULL;
2322         struct usb_driver       *driver = NULL;
2323
2324         if (ps->privileges_dropped)
2325                 return -EACCES;
2326
2327         if (!connected(ps))
2328                 return -ENODEV;
2329
2330         /* alloc buffer */
2331         size = _IOC_SIZE(ctl->ioctl_code);
2332         if (size > 0) {
2333                 buf = kmalloc(size, GFP_KERNEL);
2334                 if (buf == NULL)
2335                         return -ENOMEM;
2336                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2337                         if (copy_from_user(buf, ctl->data, size)) {
2338                                 kfree(buf);
2339                                 return -EFAULT;
2340                         }
2341                 } else {
2342                         memset(buf, 0, size);
2343                 }
2344         }
2345
2346         if (ps->dev->state != USB_STATE_CONFIGURED)
2347                 retval = -EHOSTUNREACH;
2348         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
2349                 retval = -EINVAL;
2350         else switch (ctl->ioctl_code) {
2351
2352         /* disconnect kernel driver from interface */
2353         case USBDEVFS_DISCONNECT:
2354                 if (intf->dev.driver) {
2355                         driver = to_usb_driver(intf->dev.driver);
2356                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
2357                         usb_driver_release_interface(driver, intf);
2358                 } else
2359                         retval = -ENODATA;
2360                 break;
2361
2362         /* let kernel drivers try to (re)bind to the interface */
2363         case USBDEVFS_CONNECT:
2364                 if (!intf->dev.driver)
2365                         retval = device_attach(&intf->dev);
2366                 else
2367                         retval = -EBUSY;
2368                 break;
2369
2370         /* talk directly to the interface's driver */
2371         default:
2372                 if (intf->dev.driver)
2373                         driver = to_usb_driver(intf->dev.driver);
2374                 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2375                         retval = -ENOTTY;
2376                 } else {
2377                         retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2378                         if (retval == -ENOIOCTLCMD)
2379                                 retval = -ENOTTY;
2380                 }
2381         }
2382
2383         /* cleanup and return */
2384         if (retval >= 0
2385                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2386                         && size > 0
2387                         && copy_to_user(ctl->data, buf, size) != 0)
2388                 retval = -EFAULT;
2389
2390         kfree(buf);
2391         return retval;
2392 }
2393
2394 static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2395 {
2396         struct usbdevfs_ioctl   ctrl;
2397
2398         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2399                 return -EFAULT;
2400         return proc_ioctl(ps, &ctrl);
2401 }
2402
2403 #ifdef CONFIG_COMPAT
2404 static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2405 {
2406         struct usbdevfs_ioctl32 ioc32;
2407         struct usbdevfs_ioctl ctrl;
2408
2409         if (copy_from_user(&ioc32, compat_ptr(arg), sizeof(ioc32)))
2410                 return -EFAULT;
2411         ctrl.ifno = ioc32.ifno;
2412         ctrl.ioctl_code = ioc32.ioctl_code;
2413         ctrl.data = compat_ptr(ioc32.data);
2414         return proc_ioctl(ps, &ctrl);
2415 }
2416 #endif
2417
2418 static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2419 {
2420         unsigned portnum;
2421         int rc;
2422
2423         if (get_user(portnum, (unsigned __user *) arg))
2424                 return -EFAULT;
2425         rc = usb_hub_claim_port(ps->dev, portnum, ps);
2426         if (rc == 0)
2427                 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2428                         portnum, task_pid_nr(current), current->comm);
2429         return rc;
2430 }
2431
2432 static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2433 {
2434         unsigned portnum;
2435
2436         if (get_user(portnum, (unsigned __user *) arg))
2437                 return -EFAULT;
2438         return usb_hub_release_port(ps->dev, portnum, ps);
2439 }
2440
2441 static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2442 {
2443         __u32 caps;
2444
2445         caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2446                         USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
2447                         USBDEVFS_CAP_DROP_PRIVILEGES |
2448                         USBDEVFS_CAP_CONNINFO_EX | MAYBE_CAP_SUSPEND;
2449         if (!ps->dev->bus->no_stop_on_short)
2450                 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2451         if (ps->dev->bus->sg_tablesize)
2452                 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2453
2454         if (put_user(caps, (__u32 __user *)arg))
2455                 return -EFAULT;
2456
2457         return 0;
2458 }
2459
2460 static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2461 {
2462         struct usbdevfs_disconnect_claim dc;
2463         struct usb_interface *intf;
2464
2465         if (copy_from_user(&dc, arg, sizeof(dc)))
2466                 return -EFAULT;
2467
2468         intf = usb_ifnum_to_if(ps->dev, dc.interface);
2469         if (!intf)
2470                 return -EINVAL;
2471
2472         if (intf->dev.driver) {
2473                 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2474
2475                 if (ps->privileges_dropped)
2476                         return -EACCES;
2477
2478                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2479                                 strncmp(dc.driver, intf->dev.driver->name,
2480                                         sizeof(dc.driver)) != 0)
2481                         return -EBUSY;
2482
2483                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2484                                 strncmp(dc.driver, intf->dev.driver->name,
2485                                         sizeof(dc.driver)) == 0)
2486                         return -EBUSY;
2487
2488                 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2489                 usb_driver_release_interface(driver, intf);
2490         }
2491
2492         return claimintf(ps, dc.interface);
2493 }
2494
2495 static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2496 {
2497         unsigned num_streams, num_eps;
2498         struct usb_host_endpoint **eps;
2499         struct usb_interface *intf;
2500         int r;
2501
2502         r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2503                                    &eps, &intf);
2504         if (r)
2505                 return r;
2506
2507         destroy_async_on_interface(ps,
2508                                    intf->altsetting[0].desc.bInterfaceNumber);
2509
2510         r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2511         kfree(eps);
2512         return r;
2513 }
2514
2515 static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2516 {
2517         unsigned num_eps;
2518         struct usb_host_endpoint **eps;
2519         struct usb_interface *intf;
2520         int r;
2521
2522         r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2523         if (r)
2524                 return r;
2525
2526         destroy_async_on_interface(ps,
2527                                    intf->altsetting[0].desc.bInterfaceNumber);
2528
2529         r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2530         kfree(eps);
2531         return r;
2532 }
2533
2534 static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
2535 {
2536         u32 data;
2537
2538         if (copy_from_user(&data, arg, sizeof(data)))
2539                 return -EFAULT;
2540
2541         /* This is a one way operation. Once privileges are
2542          * dropped, you cannot regain them. You may however reissue
2543          * this ioctl to shrink the allowed interfaces mask.
2544          */
2545         ps->interface_allowed_mask &= data;
2546         ps->privileges_dropped = true;
2547
2548         return 0;
2549 }
2550
2551 static int proc_forbid_suspend(struct usb_dev_state *ps)
2552 {
2553         int ret = 0;
2554
2555         if (ps->suspend_allowed) {
2556                 ret = usb_autoresume_device(ps->dev);
2557                 if (ret == 0)
2558                         ps->suspend_allowed = false;
2559                 else if (ret != -ENODEV)
2560                         ret = -EIO;
2561         }
2562         return ret;
2563 }
2564
2565 static int proc_allow_suspend(struct usb_dev_state *ps)
2566 {
2567         if (!connected(ps))
2568                 return -ENODEV;
2569
2570         WRITE_ONCE(ps->not_yet_resumed, 1);
2571         if (!ps->suspend_allowed) {
2572                 usb_autosuspend_device(ps->dev);
2573                 ps->suspend_allowed = true;
2574         }
2575         return 0;
2576 }
2577
2578 static int proc_wait_for_resume(struct usb_dev_state *ps)
2579 {
2580         int ret;
2581
2582         usb_unlock_device(ps->dev);
2583         ret = wait_event_interruptible(ps->wait_for_resume,
2584                         READ_ONCE(ps->not_yet_resumed) == 0);
2585         usb_lock_device(ps->dev);
2586
2587         if (ret != 0)
2588                 return -EINTR;
2589         return proc_forbid_suspend(ps);
2590 }
2591
2592 /*
2593  * NOTE:  All requests here that have interface numbers as parameters
2594  * are assuming that somehow the configuration has been prevented from
2595  * changing.  But there's no mechanism to ensure that...
2596  */
2597 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2598                                 void __user *p)
2599 {
2600         struct usb_dev_state *ps = file->private_data;
2601         struct inode *inode = file_inode(file);
2602         struct usb_device *dev = ps->dev;
2603         int ret = -ENOTTY;
2604
2605         if (!(file->f_mode & FMODE_WRITE))
2606                 return -EPERM;
2607
2608         usb_lock_device(dev);
2609
2610         /* Reap operations are allowed even after disconnection */
2611         switch (cmd) {
2612         case USBDEVFS_REAPURB:
2613                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2614                 ret = proc_reapurb(ps, p);
2615                 goto done;
2616
2617         case USBDEVFS_REAPURBNDELAY:
2618                 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2619                 ret = proc_reapurbnonblock(ps, p);
2620                 goto done;
2621
2622 #ifdef CONFIG_COMPAT
2623         case USBDEVFS_REAPURB32:
2624                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2625                 ret = proc_reapurb_compat(ps, p);
2626                 goto done;
2627
2628         case USBDEVFS_REAPURBNDELAY32:
2629                 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2630                 ret = proc_reapurbnonblock_compat(ps, p);
2631                 goto done;
2632 #endif
2633         }
2634
2635         if (!connected(ps)) {
2636                 usb_unlock_device(dev);
2637                 return -ENODEV;
2638         }
2639
2640         switch (cmd) {
2641         case USBDEVFS_CONTROL:
2642                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2643                 ret = proc_control(ps, p);
2644                 if (ret >= 0)
2645                         inode_set_mtime_to_ts(inode,
2646                                               inode_set_ctime_current(inode));
2647                 break;
2648
2649         case USBDEVFS_BULK:
2650                 snoop(&dev->dev, "%s: BULK\n", __func__);
2651                 ret = proc_bulk(ps, p);
2652                 if (ret >= 0)
2653                         inode_set_mtime_to_ts(inode,
2654                                               inode_set_ctime_current(inode));
2655                 break;
2656
2657         case USBDEVFS_RESETEP:
2658                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2659                 ret = proc_resetep(ps, p);
2660                 if (ret >= 0)
2661                         inode_set_mtime_to_ts(inode,
2662                                               inode_set_ctime_current(inode));
2663                 break;
2664
2665         case USBDEVFS_RESET:
2666                 snoop(&dev->dev, "%s: RESET\n", __func__);
2667                 ret = proc_resetdevice(ps);
2668                 break;
2669
2670         case USBDEVFS_CLEAR_HALT:
2671                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2672                 ret = proc_clearhalt(ps, p);
2673                 if (ret >= 0)
2674                         inode_set_mtime_to_ts(inode,
2675                                               inode_set_ctime_current(inode));
2676                 break;
2677
2678         case USBDEVFS_GETDRIVER:
2679                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2680                 ret = proc_getdriver(ps, p);
2681                 break;
2682
2683         case USBDEVFS_CONNECTINFO:
2684                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2685                 ret = proc_connectinfo(ps, p);
2686                 break;
2687
2688         case USBDEVFS_SETINTERFACE:
2689                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2690                 ret = proc_setintf(ps, p);
2691                 break;
2692
2693         case USBDEVFS_SETCONFIGURATION:
2694                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2695                 ret = proc_setconfig(ps, p);
2696                 break;
2697
2698         case USBDEVFS_SUBMITURB:
2699                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2700                 ret = proc_submiturb(ps, p);
2701                 if (ret >= 0)
2702                         inode_set_mtime_to_ts(inode,
2703                                               inode_set_ctime_current(inode));
2704                 break;
2705
2706 #ifdef CONFIG_COMPAT
2707         case USBDEVFS_CONTROL32:
2708                 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2709                 ret = proc_control_compat(ps, p);
2710                 if (ret >= 0)
2711                         inode_set_mtime_to_ts(inode,
2712                                               inode_set_ctime_current(inode));
2713                 break;
2714
2715         case USBDEVFS_BULK32:
2716                 snoop(&dev->dev, "%s: BULK32\n", __func__);
2717                 ret = proc_bulk_compat(ps, p);
2718                 if (ret >= 0)
2719                         inode_set_mtime_to_ts(inode,
2720                                               inode_set_ctime_current(inode));
2721                 break;
2722
2723         case USBDEVFS_DISCSIGNAL32:
2724                 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2725                 ret = proc_disconnectsignal_compat(ps, p);
2726                 break;
2727
2728         case USBDEVFS_SUBMITURB32:
2729                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2730                 ret = proc_submiturb_compat(ps, p);
2731                 if (ret >= 0)
2732                         inode_set_mtime_to_ts(inode,
2733                                               inode_set_ctime_current(inode));
2734                 break;
2735
2736         case USBDEVFS_IOCTL32:
2737                 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2738                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2739                 break;
2740 #endif
2741
2742         case USBDEVFS_DISCARDURB:
2743                 snoop(&dev->dev, "%s: DISCARDURB %px\n", __func__, p);
2744                 ret = proc_unlinkurb(ps, p);
2745                 break;
2746
2747         case USBDEVFS_DISCSIGNAL:
2748                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2749                 ret = proc_disconnectsignal(ps, p);
2750                 break;
2751
2752         case USBDEVFS_CLAIMINTERFACE:
2753                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2754                 ret = proc_claiminterface(ps, p);
2755                 break;
2756
2757         case USBDEVFS_RELEASEINTERFACE:
2758                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2759                 ret = proc_releaseinterface(ps, p);
2760                 break;
2761
2762         case USBDEVFS_IOCTL:
2763                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2764                 ret = proc_ioctl_default(ps, p);
2765                 break;
2766
2767         case USBDEVFS_CLAIM_PORT:
2768                 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2769                 ret = proc_claim_port(ps, p);
2770                 break;
2771
2772         case USBDEVFS_RELEASE_PORT:
2773                 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2774                 ret = proc_release_port(ps, p);
2775                 break;
2776         case USBDEVFS_GET_CAPABILITIES:
2777                 ret = proc_get_capabilities(ps, p);
2778                 break;
2779         case USBDEVFS_DISCONNECT_CLAIM:
2780                 ret = proc_disconnect_claim(ps, p);
2781                 break;
2782         case USBDEVFS_ALLOC_STREAMS:
2783                 ret = proc_alloc_streams(ps, p);
2784                 break;
2785         case USBDEVFS_FREE_STREAMS:
2786                 ret = proc_free_streams(ps, p);
2787                 break;
2788         case USBDEVFS_DROP_PRIVILEGES:
2789                 ret = proc_drop_privileges(ps, p);
2790                 break;
2791         case USBDEVFS_GET_SPEED:
2792                 ret = ps->dev->speed;
2793                 break;
2794         case USBDEVFS_FORBID_SUSPEND:
2795                 ret = proc_forbid_suspend(ps);
2796                 break;
2797         case USBDEVFS_ALLOW_SUSPEND:
2798                 ret = proc_allow_suspend(ps);
2799                 break;
2800         case USBDEVFS_WAIT_FOR_RESUME:
2801                 ret = proc_wait_for_resume(ps);
2802                 break;
2803         }
2804
2805         /* Handle variable-length commands */
2806         switch (cmd & ~IOCSIZE_MASK) {
2807         case USBDEVFS_CONNINFO_EX(0):
2808                 ret = proc_conninfo_ex(ps, p, _IOC_SIZE(cmd));
2809                 break;
2810         }
2811
2812  done:
2813         usb_unlock_device(dev);
2814         if (ret >= 0)
2815                 inode_set_atime_to_ts(inode, current_time(inode));
2816         return ret;
2817 }
2818
2819 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2820                         unsigned long arg)
2821 {
2822         int ret;
2823
2824         ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2825
2826         return ret;
2827 }
2828
2829 /* No kernel lock - fine */
2830 static __poll_t usbdev_poll(struct file *file,
2831                                 struct poll_table_struct *wait)
2832 {
2833         struct usb_dev_state *ps = file->private_data;
2834         __poll_t mask = 0;
2835
2836         poll_wait(file, &ps->wait, wait);
2837         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2838                 mask |= EPOLLOUT | EPOLLWRNORM;
2839         if (!connected(ps))
2840                 mask |= EPOLLHUP;
2841         if (list_empty(&ps->list))
2842                 mask |= EPOLLERR;
2843         return mask;
2844 }
2845
2846 const struct file_operations usbdev_file_operations = {
2847         .owner =          THIS_MODULE,
2848         .llseek =         no_seek_end_llseek,
2849         .read =           usbdev_read,
2850         .poll =           usbdev_poll,
2851         .unlocked_ioctl = usbdev_ioctl,
2852         .compat_ioctl =   compat_ptr_ioctl,
2853         .mmap =           usbdev_mmap,
2854         .open =           usbdev_open,
2855         .release =        usbdev_release,
2856 };
2857
2858 static void usbdev_remove(struct usb_device *udev)
2859 {
2860         struct usb_dev_state *ps;
2861
2862         /* Protect against simultaneous resume */
2863         mutex_lock(&usbfs_mutex);
2864         while (!list_empty(&udev->filelist)) {
2865                 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2866                 destroy_all_async(ps);
2867                 wake_up_all(&ps->wait);
2868                 WRITE_ONCE(ps->not_yet_resumed, 0);
2869                 wake_up_all(&ps->wait_for_resume);
2870                 list_del_init(&ps->list);
2871                 if (ps->discsignr)
2872                         kill_pid_usb_asyncio(ps->discsignr, EPIPE, ps->disccontext,
2873                                              ps->disc_pid, ps->cred);
2874         }
2875         mutex_unlock(&usbfs_mutex);
2876 }
2877
2878 static int usbdev_notify(struct notifier_block *self,
2879                                unsigned long action, void *dev)
2880 {
2881         switch (action) {
2882         case USB_DEVICE_ADD:
2883                 break;
2884         case USB_DEVICE_REMOVE:
2885                 usbdev_remove(dev);
2886                 break;
2887         }
2888         return NOTIFY_OK;
2889 }
2890
2891 static struct notifier_block usbdev_nb = {
2892         .notifier_call =        usbdev_notify,
2893 };
2894
2895 static struct cdev usb_device_cdev;
2896
2897 int __init usb_devio_init(void)
2898 {
2899         int retval;
2900
2901         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2902                                         "usb_device");
2903         if (retval) {
2904                 printk(KERN_ERR "Unable to register minors for usb_device\n");
2905                 goto out;
2906         }
2907         cdev_init(&usb_device_cdev, &usbdev_file_operations);
2908         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2909         if (retval) {
2910                 printk(KERN_ERR "Unable to get usb_device major %d\n",
2911                        USB_DEVICE_MAJOR);
2912                 goto error_cdev;
2913         }
2914         usb_register_notify(&usbdev_nb);
2915 out:
2916         return retval;
2917
2918 error_cdev:
2919         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2920         goto out;
2921 }
2922
2923 void usb_devio_cleanup(void)
2924 {
2925         usb_unregister_notify(&usbdev_nb);
2926         cdev_del(&usb_device_cdev);
2927         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2928 }