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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/cdev.h>
36 #include <linux/notifier.h>
37 #include <linux/security.h>
38 #include <linux/user_namespace.h>
39 #include <linux/scatterlist.h>
40 #include <linux/uaccess.h>
41 #include <linux/dma-mapping.h>
42 #include <asm/byteorder.h>
43 #include <linux/moduleparam.h>
44
45 #include "usb.h"
46
47 #define USB_MAXBUS 64
48 #define USB_DEVICE_MAX (USB_MAXBUS * 128)
49 #define USB_SG_SIZE 16384 /* split-size for large txs */
50
51 /* Mutual exclusion for removal, open, and release */
52 DEFINE_MUTEX(usbfs_mutex);
53
54 struct usb_dev_state {
55 struct list_head list; /* state list */
56 struct usb_device *dev;
57 struct file *file;
58 spinlock_t lock; /* protects the async urb lists */
59 struct list_head async_pending;
60 struct list_head async_completed;
61 struct list_head memory_list;
62 wait_queue_head_t wait; /* wake up if a request completed */
63 unsigned int discsignr;
64 struct pid *disc_pid;
65 const struct cred *cred;
66 void __user *disccontext;
67 unsigned long ifclaimed;
68 u32 secid;
69 u32 disabled_bulk_eps;
70 bool privileges_dropped;
71 unsigned long interface_allowed_mask;
72 };
73
74 struct usb_memory {
75 struct list_head memlist;
76 int vma_use_count;
77 int urb_use_count;
78 u32 size;
79 void *mem;
80 dma_addr_t dma_handle;
81 unsigned long vm_start;
82 struct usb_dev_state *ps;
83 };
84
85 struct async {
86 struct list_head asynclist;
87 struct usb_dev_state *ps;
88 struct pid *pid;
89 const struct cred *cred;
90 unsigned int signr;
91 unsigned int ifnum;
92 void __user *userbuffer;
93 void __user *userurb;
94 struct urb *urb;
95 struct usb_memory *usbm;
96 unsigned int mem_usage;
97 int status;
98 u32 secid;
99 u8 bulk_addr;
100 u8 bulk_status;
101 };
102
103 static bool usbfs_snoop;
104 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
105 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
106
107 static unsigned usbfs_snoop_max = 65536;
108 module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR);
109 MODULE_PARM_DESC(usbfs_snoop_max,
110 "maximum number of bytes to print while snooping");
111
112 #define snoop(dev, format, arg...) \
113 do { \
114 if (usbfs_snoop) \
115 dev_info(dev, format, ## arg); \
116 } while (0)
117
118 enum snoop_when {
119 SUBMIT, COMPLETE
120 };
121
122 #define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
123
124 /* Limit on the total amount of memory we can allocate for transfers */
125 static u32 usbfs_memory_mb = 16;
126 module_param(usbfs_memory_mb, uint, 0644);
127 MODULE_PARM_DESC(usbfs_memory_mb,
128 "maximum MB allowed for usbfs buffers (0 = no limit)");
129
130 /* Hard limit, necessary to avoid arithmetic overflow */
131 #define USBFS_XFER_MAX (UINT_MAX / 2 - 1000000)
132
133 static atomic64_t usbfs_memory_usage; /* Total memory currently allocated */
134
135 /* Check whether it's okay to allocate more memory for a transfer */
136 static int usbfs_increase_memory_usage(u64 amount)
137 {
138 u64 lim;
139
140 lim = READ_ONCE(usbfs_memory_mb);
141 lim <<= 20;
142
143 atomic64_add(amount, &usbfs_memory_usage);
144
145 if (lim > 0 && atomic64_read(&usbfs_memory_usage) > lim) {
146 atomic64_sub(amount, &usbfs_memory_usage);
147 return -ENOMEM;
148 }
149
150 return 0;
151 }
152
153 /* Memory for a transfer is being deallocated */
154 static void usbfs_decrease_memory_usage(u64 amount)
155 {
156 atomic64_sub(amount, &usbfs_memory_usage);
157 }
158
159 static int connected(struct usb_dev_state *ps)
160 {
161 return (!list_empty(&ps->list) &&
162 ps->dev->state != USB_STATE_NOTATTACHED);
163 }
164
165 static void dec_usb_memory_use_count(struct usb_memory *usbm, int *count)
166 {
167 struct usb_dev_state *ps = usbm->ps;
168 unsigned long flags;
169
170 spin_lock_irqsave(&ps->lock, flags);
171 --*count;
172 if (usbm->urb_use_count == 0 && usbm->vma_use_count == 0) {
173 list_del(&usbm->memlist);
174 spin_unlock_irqrestore(&ps->lock, flags);
175
176 usb_free_coherent(ps->dev, usbm->size, usbm->mem,
177 usbm->dma_handle);
178 usbfs_decrease_memory_usage(
179 usbm->size + sizeof(struct usb_memory));
180 kfree(usbm);
181 } else {
182 spin_unlock_irqrestore(&ps->lock, flags);
183 }
184 }
185
186 static void usbdev_vm_open(struct vm_area_struct *vma)
187 {
188 struct usb_memory *usbm = vma->vm_private_data;
189 unsigned long flags;
190
191 spin_lock_irqsave(&usbm->ps->lock, flags);
192 ++usbm->vma_use_count;
193 spin_unlock_irqrestore(&usbm->ps->lock, flags);
194 }
195
196 static void usbdev_vm_close(struct vm_area_struct *vma)
197 {
198 struct usb_memory *usbm = vma->vm_private_data;
199
200 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
201 }
202
203 static const struct vm_operations_struct usbdev_vm_ops = {
204 .open = usbdev_vm_open,
205 .close = usbdev_vm_close
206 };
207
208 static int usbdev_mmap(struct file *file, struct vm_area_struct *vma)
209 {
210 struct usb_memory *usbm = NULL;
211 struct usb_dev_state *ps = file->private_data;
212 size_t size = vma->vm_end - vma->vm_start;
213 void *mem;
214 unsigned long flags;
215 dma_addr_t dma_handle;
216 int ret;
217
218 ret = usbfs_increase_memory_usage(size + sizeof(struct usb_memory));
219 if (ret)
220 goto error;
221
222 usbm = kzalloc(sizeof(struct usb_memory), GFP_KERNEL);
223 if (!usbm) {
224 ret = -ENOMEM;
225 goto error_decrease_mem;
226 }
227
228 mem = usb_alloc_coherent(ps->dev, size, GFP_USER | __GFP_NOWARN,
229 &dma_handle);
230 if (!mem) {
231 ret = -ENOMEM;
232 goto error_free_usbm;
233 }
234
235 memset(mem, 0, size);
236
237 usbm->mem = mem;
238 usbm->dma_handle = dma_handle;
239 usbm->size = size;
240 usbm->ps = ps;
241 usbm->vm_start = vma->vm_start;
242 usbm->vma_use_count = 1;
243 INIT_LIST_HEAD(&usbm->memlist);
244
245 if (remap_pfn_range(vma, vma->vm_start,
246 virt_to_phys(usbm->mem) >> PAGE_SHIFT,
247 size, vma->vm_page_prot) < 0) {
248 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
249 return -EAGAIN;
250 }
251
252 vma->vm_flags |= VM_IO;
253 vma->vm_flags |= (VM_DONTEXPAND | VM_DONTDUMP);
254 vma->vm_ops = &usbdev_vm_ops;
255 vma->vm_private_data = usbm;
256
257 spin_lock_irqsave(&ps->lock, flags);
258 list_add_tail(&usbm->memlist, &ps->memory_list);
259 spin_unlock_irqrestore(&ps->lock, flags);
260
261 return 0;
262
263 error_free_usbm:
264 kfree(usbm);
265 error_decrease_mem:
266 usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
267 error:
268 return ret;
269 }
270
271 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
272 loff_t *ppos)
273 {
274 struct usb_dev_state *ps = file->private_data;
275 struct usb_device *dev = ps->dev;
276 ssize_t ret = 0;
277 unsigned len;
278 loff_t pos;
279 int i;
280
281 pos = *ppos;
282 usb_lock_device(dev);
283 if (!connected(ps)) {
284 ret = -ENODEV;
285 goto err;
286 } else if (pos < 0) {
287 ret = -EINVAL;
288 goto err;
289 }
290
291 if (pos < sizeof(struct usb_device_descriptor)) {
292 /* 18 bytes - fits on the stack */
293 struct usb_device_descriptor temp_desc;
294
295 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
296 le16_to_cpus(&temp_desc.bcdUSB);
297 le16_to_cpus(&temp_desc.idVendor);
298 le16_to_cpus(&temp_desc.idProduct);
299 le16_to_cpus(&temp_desc.bcdDevice);
300
301 len = sizeof(struct usb_device_descriptor) - pos;
302 if (len > nbytes)
303 len = nbytes;
304 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
305 ret = -EFAULT;
306 goto err;
307 }
308
309 *ppos += len;
310 buf += len;
311 nbytes -= len;
312 ret += len;
313 }
314
315 pos = sizeof(struct usb_device_descriptor);
316 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
317 struct usb_config_descriptor *config =
318 (struct usb_config_descriptor *)dev->rawdescriptors[i];
319 unsigned int length = le16_to_cpu(config->wTotalLength);
320
321 if (*ppos < pos + length) {
322
323 /* The descriptor may claim to be longer than it
324 * really is. Here is the actual allocated length. */
325 unsigned alloclen =
326 le16_to_cpu(dev->config[i].desc.wTotalLength);
327
328 len = length - (*ppos - pos);
329 if (len > nbytes)
330 len = nbytes;
331
332 /* Simply don't write (skip over) unallocated parts */
333 if (alloclen > (*ppos - pos)) {
334 alloclen -= (*ppos - pos);
335 if (copy_to_user(buf,
336 dev->rawdescriptors[i] + (*ppos - pos),
337 min(len, alloclen))) {
338 ret = -EFAULT;
339 goto err;
340 }
341 }
342
343 *ppos += len;
344 buf += len;
345 nbytes -= len;
346 ret += len;
347 }
348
349 pos += length;
350 }
351
352 err:
353 usb_unlock_device(dev);
354 return ret;
355 }
356
357 /*
358 * async list handling
359 */
360
361 static struct async *alloc_async(unsigned int numisoframes)
362 {
363 struct async *as;
364
365 as = kzalloc(sizeof(struct async), GFP_KERNEL);
366 if (!as)
367 return NULL;
368 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
369 if (!as->urb) {
370 kfree(as);
371 return NULL;
372 }
373 return as;
374 }
375
376 static void free_async(struct async *as)
377 {
378 int i;
379
380 put_pid(as->pid);
381 if (as->cred)
382 put_cred(as->cred);
383 for (i = 0; i < as->urb->num_sgs; i++) {
384 if (sg_page(&as->urb->sg[i]))
385 kfree(sg_virt(&as->urb->sg[i]));
386 }
387
388 kfree(as->urb->sg);
389 if (as->usbm == NULL)
390 kfree(as->urb->transfer_buffer);
391 else
392 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
393
394 kfree(as->urb->setup_packet);
395 usb_free_urb(as->urb);
396 usbfs_decrease_memory_usage(as->mem_usage);
397 kfree(as);
398 }
399
400 static void async_newpending(struct async *as)
401 {
402 struct usb_dev_state *ps = as->ps;
403 unsigned long flags;
404
405 spin_lock_irqsave(&ps->lock, flags);
406 list_add_tail(&as->asynclist, &ps->async_pending);
407 spin_unlock_irqrestore(&ps->lock, flags);
408 }
409
410 static void async_removepending(struct async *as)
411 {
412 struct usb_dev_state *ps = as->ps;
413 unsigned long flags;
414
415 spin_lock_irqsave(&ps->lock, flags);
416 list_del_init(&as->asynclist);
417 spin_unlock_irqrestore(&ps->lock, flags);
418 }
419
420 static struct async *async_getcompleted(struct usb_dev_state *ps)
421 {
422 unsigned long flags;
423 struct async *as = NULL;
424
425 spin_lock_irqsave(&ps->lock, flags);
426 if (!list_empty(&ps->async_completed)) {
427 as = list_entry(ps->async_completed.next, struct async,
428 asynclist);
429 list_del_init(&as->asynclist);
430 }
431 spin_unlock_irqrestore(&ps->lock, flags);
432 return as;
433 }
434
435 static struct async *async_getpending(struct usb_dev_state *ps,
436 void __user *userurb)
437 {
438 struct async *as;
439
440 list_for_each_entry(as, &ps->async_pending, asynclist)
441 if (as->userurb == userurb) {
442 list_del_init(&as->asynclist);
443 return as;
444 }
445
446 return NULL;
447 }
448
449 static void snoop_urb(struct usb_device *udev,
450 void __user *userurb, int pipe, unsigned length,
451 int timeout_or_status, enum snoop_when when,
452 unsigned char *data, unsigned data_len)
453 {
454 static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
455 static const char *dirs[] = {"out", "in"};
456 int ep;
457 const char *t, *d;
458
459 if (!usbfs_snoop)
460 return;
461
462 ep = usb_pipeendpoint(pipe);
463 t = types[usb_pipetype(pipe)];
464 d = dirs[!!usb_pipein(pipe)];
465
466 if (userurb) { /* Async */
467 if (when == SUBMIT)
468 dev_info(&udev->dev, "userurb %pK, ep%d %s-%s, "
469 "length %u\n",
470 userurb, ep, t, d, length);
471 else
472 dev_info(&udev->dev, "userurb %pK, ep%d %s-%s, "
473 "actual_length %u status %d\n",
474 userurb, ep, t, d, length,
475 timeout_or_status);
476 } else {
477 if (when == SUBMIT)
478 dev_info(&udev->dev, "ep%d %s-%s, length %u, "
479 "timeout %d\n",
480 ep, t, d, length, timeout_or_status);
481 else
482 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
483 "status %d\n",
484 ep, t, d, length, timeout_or_status);
485 }
486
487 data_len = min(data_len, usbfs_snoop_max);
488 if (data && data_len > 0) {
489 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
490 data, data_len, 1);
491 }
492 }
493
494 static void snoop_urb_data(struct urb *urb, unsigned len)
495 {
496 int i, size;
497
498 len = min(len, usbfs_snoop_max);
499 if (!usbfs_snoop || len == 0)
500 return;
501
502 if (urb->num_sgs == 0) {
503 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
504 urb->transfer_buffer, len, 1);
505 return;
506 }
507
508 for (i = 0; i < urb->num_sgs && len; i++) {
509 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
510 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
511 sg_virt(&urb->sg[i]), size, 1);
512 len -= size;
513 }
514 }
515
516 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
517 {
518 unsigned i, len, size;
519
520 if (urb->number_of_packets > 0) /* Isochronous */
521 len = urb->transfer_buffer_length;
522 else /* Non-Isoc */
523 len = urb->actual_length;
524
525 if (urb->num_sgs == 0) {
526 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
527 return -EFAULT;
528 return 0;
529 }
530
531 for (i = 0; i < urb->num_sgs && len; i++) {
532 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
533 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
534 return -EFAULT;
535 userbuffer += size;
536 len -= size;
537 }
538
539 return 0;
540 }
541
542 #define AS_CONTINUATION 1
543 #define AS_UNLINK 2
544
545 static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
546 __releases(ps->lock)
547 __acquires(ps->lock)
548 {
549 struct urb *urb;
550 struct async *as;
551
552 /* Mark all the pending URBs that match bulk_addr, up to but not
553 * including the first one without AS_CONTINUATION. If such an
554 * URB is encountered then a new transfer has already started so
555 * the endpoint doesn't need to be disabled; otherwise it does.
556 */
557 list_for_each_entry(as, &ps->async_pending, asynclist) {
558 if (as->bulk_addr == bulk_addr) {
559 if (as->bulk_status != AS_CONTINUATION)
560 goto rescan;
561 as->bulk_status = AS_UNLINK;
562 as->bulk_addr = 0;
563 }
564 }
565 ps->disabled_bulk_eps |= (1 << bulk_addr);
566
567 /* Now carefully unlink all the marked pending URBs */
568 rescan:
569 list_for_each_entry(as, &ps->async_pending, asynclist) {
570 if (as->bulk_status == AS_UNLINK) {
571 as->bulk_status = 0; /* Only once */
572 urb = as->urb;
573 usb_get_urb(urb);
574 spin_unlock(&ps->lock); /* Allow completions */
575 usb_unlink_urb(urb);
576 usb_put_urb(urb);
577 spin_lock(&ps->lock);
578 goto rescan;
579 }
580 }
581 }
582
583 static void async_completed(struct urb *urb)
584 {
585 struct async *as = urb->context;
586 struct usb_dev_state *ps = as->ps;
587 struct siginfo sinfo;
588 struct pid *pid = NULL;
589 u32 secid = 0;
590 const struct cred *cred = NULL;
591 int signr;
592
593 spin_lock(&ps->lock);
594 list_move_tail(&as->asynclist, &ps->async_completed);
595 as->status = urb->status;
596 signr = as->signr;
597 if (signr) {
598 memset(&sinfo, 0, sizeof(sinfo));
599 sinfo.si_signo = as->signr;
600 sinfo.si_errno = as->status;
601 sinfo.si_code = SI_ASYNCIO;
602 sinfo.si_addr = as->userurb;
603 pid = get_pid(as->pid);
604 cred = get_cred(as->cred);
605 secid = as->secid;
606 }
607 snoop(&urb->dev->dev, "urb complete\n");
608 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
609 as->status, COMPLETE, NULL, 0);
610 if ((urb->transfer_flags & URB_DIR_MASK) == URB_DIR_IN)
611 snoop_urb_data(urb, urb->actual_length);
612
613 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
614 as->status != -ENOENT)
615 cancel_bulk_urbs(ps, as->bulk_addr);
616
617 wake_up(&ps->wait);
618 spin_unlock(&ps->lock);
619
620 if (signr) {
621 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid);
622 put_pid(pid);
623 put_cred(cred);
624 }
625 }
626
627 static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
628 {
629 struct urb *urb;
630 struct async *as;
631 unsigned long flags;
632
633 spin_lock_irqsave(&ps->lock, flags);
634 while (!list_empty(list)) {
635 as = list_entry(list->next, struct async, asynclist);
636 list_del_init(&as->asynclist);
637 urb = as->urb;
638 usb_get_urb(urb);
639
640 /* drop the spinlock so the completion handler can run */
641 spin_unlock_irqrestore(&ps->lock, flags);
642 usb_kill_urb(urb);
643 usb_put_urb(urb);
644 spin_lock_irqsave(&ps->lock, flags);
645 }
646 spin_unlock_irqrestore(&ps->lock, flags);
647 }
648
649 static void destroy_async_on_interface(struct usb_dev_state *ps,
650 unsigned int ifnum)
651 {
652 struct list_head *p, *q, hitlist;
653 unsigned long flags;
654
655 INIT_LIST_HEAD(&hitlist);
656 spin_lock_irqsave(&ps->lock, flags);
657 list_for_each_safe(p, q, &ps->async_pending)
658 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
659 list_move_tail(p, &hitlist);
660 spin_unlock_irqrestore(&ps->lock, flags);
661 destroy_async(ps, &hitlist);
662 }
663
664 static void destroy_all_async(struct usb_dev_state *ps)
665 {
666 destroy_async(ps, &ps->async_pending);
667 }
668
669 /*
670 * interface claims are made only at the request of user level code,
671 * which can also release them (explicitly or by closing files).
672 * they're also undone when devices disconnect.
673 */
674
675 static int driver_probe(struct usb_interface *intf,
676 const struct usb_device_id *id)
677 {
678 return -ENODEV;
679 }
680
681 static void driver_disconnect(struct usb_interface *intf)
682 {
683 struct usb_dev_state *ps = usb_get_intfdata(intf);
684 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
685
686 if (!ps)
687 return;
688
689 /* NOTE: this relies on usbcore having canceled and completed
690 * all pending I/O requests; 2.6 does that.
691 */
692
693 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
694 clear_bit(ifnum, &ps->ifclaimed);
695 else
696 dev_warn(&intf->dev, "interface number %u out of range\n",
697 ifnum);
698
699 usb_set_intfdata(intf, NULL);
700
701 /* force async requests to complete */
702 destroy_async_on_interface(ps, ifnum);
703 }
704
705 /* The following routines are merely placeholders. There is no way
706 * to inform a user task about suspend or resumes.
707 */
708 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
709 {
710 return 0;
711 }
712
713 static int driver_resume(struct usb_interface *intf)
714 {
715 return 0;
716 }
717
718 struct usb_driver usbfs_driver = {
719 .name = "usbfs",
720 .probe = driver_probe,
721 .disconnect = driver_disconnect,
722 .suspend = driver_suspend,
723 .resume = driver_resume,
724 };
725
726 static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
727 {
728 struct usb_device *dev = ps->dev;
729 struct usb_interface *intf;
730 int err;
731
732 if (ifnum >= 8*sizeof(ps->ifclaimed))
733 return -EINVAL;
734 /* already claimed */
735 if (test_bit(ifnum, &ps->ifclaimed))
736 return 0;
737
738 if (ps->privileges_dropped &&
739 !test_bit(ifnum, &ps->interface_allowed_mask))
740 return -EACCES;
741
742 intf = usb_ifnum_to_if(dev, ifnum);
743 if (!intf)
744 err = -ENOENT;
745 else
746 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
747 if (err == 0)
748 set_bit(ifnum, &ps->ifclaimed);
749 return err;
750 }
751
752 static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
753 {
754 struct usb_device *dev;
755 struct usb_interface *intf;
756 int err;
757
758 err = -EINVAL;
759 if (ifnum >= 8*sizeof(ps->ifclaimed))
760 return err;
761 dev = ps->dev;
762 intf = usb_ifnum_to_if(dev, ifnum);
763 if (!intf)
764 err = -ENOENT;
765 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
766 usb_driver_release_interface(&usbfs_driver, intf);
767 err = 0;
768 }
769 return err;
770 }
771
772 static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
773 {
774 if (ps->dev->state != USB_STATE_CONFIGURED)
775 return -EHOSTUNREACH;
776 if (ifnum >= 8*sizeof(ps->ifclaimed))
777 return -EINVAL;
778 if (test_bit(ifnum, &ps->ifclaimed))
779 return 0;
780 /* if not yet claimed, claim it for the driver */
781 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
782 "interface %u before use\n", task_pid_nr(current),
783 current->comm, ifnum);
784 return claimintf(ps, ifnum);
785 }
786
787 static int findintfep(struct usb_device *dev, unsigned int ep)
788 {
789 unsigned int i, j, e;
790 struct usb_interface *intf;
791 struct usb_host_interface *alts;
792 struct usb_endpoint_descriptor *endpt;
793
794 if (ep & ~(USB_DIR_IN|0xf))
795 return -EINVAL;
796 if (!dev->actconfig)
797 return -ESRCH;
798 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
799 intf = dev->actconfig->interface[i];
800 for (j = 0; j < intf->num_altsetting; j++) {
801 alts = &intf->altsetting[j];
802 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
803 endpt = &alts->endpoint[e].desc;
804 if (endpt->bEndpointAddress == ep)
805 return alts->desc.bInterfaceNumber;
806 }
807 }
808 }
809 return -ENOENT;
810 }
811
812 static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
813 unsigned int request, unsigned int index)
814 {
815 int ret = 0;
816 struct usb_host_interface *alt_setting;
817
818 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
819 && ps->dev->state != USB_STATE_ADDRESS
820 && ps->dev->state != USB_STATE_CONFIGURED)
821 return -EHOSTUNREACH;
822 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
823 return 0;
824
825 /*
826 * check for the special corner case 'get_device_id' in the printer
827 * class specification, which we always want to allow as it is used
828 * to query things like ink level, etc.
829 */
830 if (requesttype == 0xa1 && request == 0) {
831 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
832 index >> 8, index & 0xff);
833 if (alt_setting
834 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
835 return 0;
836 }
837
838 index &= 0xff;
839 switch (requesttype & USB_RECIP_MASK) {
840 case USB_RECIP_ENDPOINT:
841 if ((index & ~USB_DIR_IN) == 0)
842 return 0;
843 ret = findintfep(ps->dev, index);
844 if (ret < 0) {
845 /*
846 * Some not fully compliant Win apps seem to get
847 * index wrong and have the endpoint number here
848 * rather than the endpoint address (with the
849 * correct direction). Win does let this through,
850 * so we'll not reject it here but leave it to
851 * the device to not break KVM. But we warn.
852 */
853 ret = findintfep(ps->dev, index ^ 0x80);
854 if (ret >= 0)
855 dev_info(&ps->dev->dev,
856 "%s: process %i (%s) requesting ep %02x but needs %02x\n",
857 __func__, task_pid_nr(current),
858 current->comm, index, index ^ 0x80);
859 }
860 if (ret >= 0)
861 ret = checkintf(ps, ret);
862 break;
863
864 case USB_RECIP_INTERFACE:
865 ret = checkintf(ps, index);
866 break;
867 }
868 return ret;
869 }
870
871 static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
872 unsigned char ep)
873 {
874 if (ep & USB_ENDPOINT_DIR_MASK)
875 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
876 else
877 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
878 }
879
880 static int parse_usbdevfs_streams(struct usb_dev_state *ps,
881 struct usbdevfs_streams __user *streams,
882 unsigned int *num_streams_ret,
883 unsigned int *num_eps_ret,
884 struct usb_host_endpoint ***eps_ret,
885 struct usb_interface **intf_ret)
886 {
887 unsigned int i, num_streams, num_eps;
888 struct usb_host_endpoint **eps;
889 struct usb_interface *intf = NULL;
890 unsigned char ep;
891 int ifnum, ret;
892
893 if (get_user(num_streams, &streams->num_streams) ||
894 get_user(num_eps, &streams->num_eps))
895 return -EFAULT;
896
897 if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
898 return -EINVAL;
899
900 /* The XHCI controller allows max 2 ^ 16 streams */
901 if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
902 return -EINVAL;
903
904 eps = kmalloc(num_eps * sizeof(*eps), GFP_KERNEL);
905 if (!eps)
906 return -ENOMEM;
907
908 for (i = 0; i < num_eps; i++) {
909 if (get_user(ep, &streams->eps[i])) {
910 ret = -EFAULT;
911 goto error;
912 }
913 eps[i] = ep_to_host_endpoint(ps->dev, ep);
914 if (!eps[i]) {
915 ret = -EINVAL;
916 goto error;
917 }
918
919 /* usb_alloc/free_streams operate on an usb_interface */
920 ifnum = findintfep(ps->dev, ep);
921 if (ifnum < 0) {
922 ret = ifnum;
923 goto error;
924 }
925
926 if (i == 0) {
927 ret = checkintf(ps, ifnum);
928 if (ret < 0)
929 goto error;
930 intf = usb_ifnum_to_if(ps->dev, ifnum);
931 } else {
932 /* Verify all eps belong to the same interface */
933 if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
934 ret = -EINVAL;
935 goto error;
936 }
937 }
938 }
939
940 if (num_streams_ret)
941 *num_streams_ret = num_streams;
942 *num_eps_ret = num_eps;
943 *eps_ret = eps;
944 *intf_ret = intf;
945
946 return 0;
947
948 error:
949 kfree(eps);
950 return ret;
951 }
952
953 static int match_devt(struct device *dev, void *data)
954 {
955 return dev->devt == (dev_t) (unsigned long) data;
956 }
957
958 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
959 {
960 struct device *dev;
961
962 dev = bus_find_device(&usb_bus_type, NULL,
963 (void *) (unsigned long) devt, match_devt);
964 if (!dev)
965 return NULL;
966 return to_usb_device(dev);
967 }
968
969 /*
970 * file operations
971 */
972 static int usbdev_open(struct inode *inode, struct file *file)
973 {
974 struct usb_device *dev = NULL;
975 struct usb_dev_state *ps;
976 int ret;
977
978 ret = -ENOMEM;
979 ps = kzalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
980 if (!ps)
981 goto out_free_ps;
982
983 ret = -ENODEV;
984
985 /* Protect against simultaneous removal or release */
986 mutex_lock(&usbfs_mutex);
987
988 /* usbdev device-node */
989 if (imajor(inode) == USB_DEVICE_MAJOR)
990 dev = usbdev_lookup_by_devt(inode->i_rdev);
991
992 mutex_unlock(&usbfs_mutex);
993
994 if (!dev)
995 goto out_free_ps;
996
997 usb_lock_device(dev);
998 if (dev->state == USB_STATE_NOTATTACHED)
999 goto out_unlock_device;
1000
1001 ret = usb_autoresume_device(dev);
1002 if (ret)
1003 goto out_unlock_device;
1004
1005 ps->dev = dev;
1006 ps->file = file;
1007 ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
1008 spin_lock_init(&ps->lock);
1009 INIT_LIST_HEAD(&ps->list);
1010 INIT_LIST_HEAD(&ps->async_pending);
1011 INIT_LIST_HEAD(&ps->async_completed);
1012 INIT_LIST_HEAD(&ps->memory_list);
1013 init_waitqueue_head(&ps->wait);
1014 ps->disc_pid = get_pid(task_pid(current));
1015 ps->cred = get_current_cred();
1016 security_task_getsecid(current, &ps->secid);
1017 smp_wmb();
1018 list_add_tail(&ps->list, &dev->filelist);
1019 file->private_data = ps;
1020 usb_unlock_device(dev);
1021 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
1022 current->comm);
1023 return ret;
1024
1025 out_unlock_device:
1026 usb_unlock_device(dev);
1027 usb_put_dev(dev);
1028 out_free_ps:
1029 kfree(ps);
1030 return ret;
1031 }
1032
1033 static int usbdev_release(struct inode *inode, struct file *file)
1034 {
1035 struct usb_dev_state *ps = file->private_data;
1036 struct usb_device *dev = ps->dev;
1037 unsigned int ifnum;
1038 struct async *as;
1039
1040 usb_lock_device(dev);
1041 usb_hub_release_all_ports(dev, ps);
1042
1043 list_del_init(&ps->list);
1044
1045 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
1046 ifnum++) {
1047 if (test_bit(ifnum, &ps->ifclaimed))
1048 releaseintf(ps, ifnum);
1049 }
1050 destroy_all_async(ps);
1051 usb_autosuspend_device(dev);
1052 usb_unlock_device(dev);
1053 usb_put_dev(dev);
1054 put_pid(ps->disc_pid);
1055 put_cred(ps->cred);
1056
1057 as = async_getcompleted(ps);
1058 while (as) {
1059 free_async(as);
1060 as = async_getcompleted(ps);
1061 }
1062
1063 kfree(ps);
1064 return 0;
1065 }
1066
1067 static int proc_control(struct usb_dev_state *ps, void __user *arg)
1068 {
1069 struct usb_device *dev = ps->dev;
1070 struct usbdevfs_ctrltransfer ctrl;
1071 unsigned int tmo;
1072 unsigned char *tbuf;
1073 unsigned wLength;
1074 int i, pipe, ret;
1075
1076 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1077 return -EFAULT;
1078 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
1079 ctrl.wIndex);
1080 if (ret)
1081 return ret;
1082 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
1083 if (wLength > PAGE_SIZE)
1084 return -EINVAL;
1085 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1086 sizeof(struct usb_ctrlrequest));
1087 if (ret)
1088 return ret;
1089 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1090 if (!tbuf) {
1091 ret = -ENOMEM;
1092 goto done;
1093 }
1094 tmo = ctrl.timeout;
1095 snoop(&dev->dev, "control urb: bRequestType=%02x "
1096 "bRequest=%02x wValue=%04x "
1097 "wIndex=%04x wLength=%04x\n",
1098 ctrl.bRequestType, ctrl.bRequest, ctrl.wValue,
1099 ctrl.wIndex, ctrl.wLength);
1100 if (ctrl.bRequestType & 0x80) {
1101 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
1102 ctrl.wLength)) {
1103 ret = -EINVAL;
1104 goto done;
1105 }
1106 pipe = usb_rcvctrlpipe(dev, 0);
1107 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
1108
1109 usb_unlock_device(dev);
1110 i = usb_control_msg(dev, pipe, ctrl.bRequest,
1111 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1112 tbuf, ctrl.wLength, tmo);
1113 usb_lock_device(dev);
1114 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
1115 tbuf, max(i, 0));
1116 if ((i > 0) && ctrl.wLength) {
1117 if (copy_to_user(ctrl.data, tbuf, i)) {
1118 ret = -EFAULT;
1119 goto done;
1120 }
1121 }
1122 } else {
1123 if (ctrl.wLength) {
1124 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
1125 ret = -EFAULT;
1126 goto done;
1127 }
1128 }
1129 pipe = usb_sndctrlpipe(dev, 0);
1130 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
1131 tbuf, ctrl.wLength);
1132
1133 usb_unlock_device(dev);
1134 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
1135 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1136 tbuf, ctrl.wLength, tmo);
1137 usb_lock_device(dev);
1138 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
1139 }
1140 if (i < 0 && i != -EPIPE) {
1141 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1142 "failed cmd %s rqt %u rq %u len %u ret %d\n",
1143 current->comm, ctrl.bRequestType, ctrl.bRequest,
1144 ctrl.wLength, i);
1145 }
1146 ret = i;
1147 done:
1148 free_page((unsigned long) tbuf);
1149 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1150 sizeof(struct usb_ctrlrequest));
1151 return ret;
1152 }
1153
1154 static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1155 {
1156 struct usb_device *dev = ps->dev;
1157 struct usbdevfs_bulktransfer bulk;
1158 unsigned int tmo, len1, pipe;
1159 int len2;
1160 unsigned char *tbuf;
1161 int i, ret;
1162
1163 if (copy_from_user(&bulk, arg, sizeof(bulk)))
1164 return -EFAULT;
1165 ret = findintfep(ps->dev, bulk.ep);
1166 if (ret < 0)
1167 return ret;
1168 ret = checkintf(ps, ret);
1169 if (ret)
1170 return ret;
1171 if (bulk.ep & USB_DIR_IN)
1172 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
1173 else
1174 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
1175 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
1176 return -EINVAL;
1177 len1 = bulk.len;
1178 if (len1 >= (INT_MAX - sizeof(struct urb)))
1179 return -EINVAL;
1180 ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1181 if (ret)
1182 return ret;
1183 tbuf = kmalloc(len1, GFP_KERNEL);
1184 if (!tbuf) {
1185 ret = -ENOMEM;
1186 goto done;
1187 }
1188 tmo = bulk.timeout;
1189 if (bulk.ep & 0x80) {
1190 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
1191 ret = -EINVAL;
1192 goto done;
1193 }
1194 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1195
1196 usb_unlock_device(dev);
1197 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1198 usb_lock_device(dev);
1199 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1200
1201 if (!i && len2) {
1202 if (copy_to_user(bulk.data, tbuf, len2)) {
1203 ret = -EFAULT;
1204 goto done;
1205 }
1206 }
1207 } else {
1208 if (len1) {
1209 if (copy_from_user(tbuf, bulk.data, len1)) {
1210 ret = -EFAULT;
1211 goto done;
1212 }
1213 }
1214 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1215
1216 usb_unlock_device(dev);
1217 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1218 usb_lock_device(dev);
1219 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1220 }
1221 ret = (i < 0 ? i : len2);
1222 done:
1223 kfree(tbuf);
1224 usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1225 return ret;
1226 }
1227
1228 static void check_reset_of_active_ep(struct usb_device *udev,
1229 unsigned int epnum, char *ioctl_name)
1230 {
1231 struct usb_host_endpoint **eps;
1232 struct usb_host_endpoint *ep;
1233
1234 eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1235 ep = eps[epnum & 0x0f];
1236 if (ep && !list_empty(&ep->urb_list))
1237 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1238 task_pid_nr(current), current->comm,
1239 ioctl_name, epnum);
1240 }
1241
1242 static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1243 {
1244 unsigned int ep;
1245 int ret;
1246
1247 if (get_user(ep, (unsigned int __user *)arg))
1248 return -EFAULT;
1249 ret = findintfep(ps->dev, ep);
1250 if (ret < 0)
1251 return ret;
1252 ret = checkintf(ps, ret);
1253 if (ret)
1254 return ret;
1255 check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1256 usb_reset_endpoint(ps->dev, ep);
1257 return 0;
1258 }
1259
1260 static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1261 {
1262 unsigned int ep;
1263 int pipe;
1264 int ret;
1265
1266 if (get_user(ep, (unsigned int __user *)arg))
1267 return -EFAULT;
1268 ret = findintfep(ps->dev, ep);
1269 if (ret < 0)
1270 return ret;
1271 ret = checkintf(ps, ret);
1272 if (ret)
1273 return ret;
1274 check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1275 if (ep & USB_DIR_IN)
1276 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1277 else
1278 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1279
1280 return usb_clear_halt(ps->dev, pipe);
1281 }
1282
1283 static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1284 {
1285 struct usbdevfs_getdriver gd;
1286 struct usb_interface *intf;
1287 int ret;
1288
1289 if (copy_from_user(&gd, arg, sizeof(gd)))
1290 return -EFAULT;
1291 intf = usb_ifnum_to_if(ps->dev, gd.interface);
1292 if (!intf || !intf->dev.driver)
1293 ret = -ENODATA;
1294 else {
1295 strlcpy(gd.driver, intf->dev.driver->name,
1296 sizeof(gd.driver));
1297 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1298 }
1299 return ret;
1300 }
1301
1302 static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1303 {
1304 struct usbdevfs_connectinfo ci;
1305
1306 memset(&ci, 0, sizeof(ci));
1307 ci.devnum = ps->dev->devnum;
1308 ci.slow = ps->dev->speed == USB_SPEED_LOW;
1309
1310 if (copy_to_user(arg, &ci, sizeof(ci)))
1311 return -EFAULT;
1312 return 0;
1313 }
1314
1315 static int proc_resetdevice(struct usb_dev_state *ps)
1316 {
1317 struct usb_host_config *actconfig = ps->dev->actconfig;
1318 struct usb_interface *interface;
1319 int i, number;
1320
1321 /* Don't allow a device reset if the process has dropped the
1322 * privilege to do such things and any of the interfaces are
1323 * currently claimed.
1324 */
1325 if (ps->privileges_dropped && actconfig) {
1326 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1327 interface = actconfig->interface[i];
1328 number = interface->cur_altsetting->desc.bInterfaceNumber;
1329 if (usb_interface_claimed(interface) &&
1330 !test_bit(number, &ps->ifclaimed)) {
1331 dev_warn(&ps->dev->dev,
1332 "usbfs: interface %d claimed by %s while '%s' resets device\n",
1333 number, interface->dev.driver->name, current->comm);
1334 return -EACCES;
1335 }
1336 }
1337 }
1338
1339 return usb_reset_device(ps->dev);
1340 }
1341
1342 static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1343 {
1344 struct usbdevfs_setinterface setintf;
1345 int ret;
1346
1347 if (copy_from_user(&setintf, arg, sizeof(setintf)))
1348 return -EFAULT;
1349 ret = checkintf(ps, setintf.interface);
1350 if (ret)
1351 return ret;
1352
1353 destroy_async_on_interface(ps, setintf.interface);
1354
1355 return usb_set_interface(ps->dev, setintf.interface,
1356 setintf.altsetting);
1357 }
1358
1359 static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1360 {
1361 int u;
1362 int status = 0;
1363 struct usb_host_config *actconfig;
1364
1365 if (get_user(u, (int __user *)arg))
1366 return -EFAULT;
1367
1368 actconfig = ps->dev->actconfig;
1369
1370 /* Don't touch the device if any interfaces are claimed.
1371 * It could interfere with other drivers' operations, and if
1372 * an interface is claimed by usbfs it could easily deadlock.
1373 */
1374 if (actconfig) {
1375 int i;
1376
1377 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1378 if (usb_interface_claimed(actconfig->interface[i])) {
1379 dev_warn(&ps->dev->dev,
1380 "usbfs: interface %d claimed by %s "
1381 "while '%s' sets config #%d\n",
1382 actconfig->interface[i]
1383 ->cur_altsetting
1384 ->desc.bInterfaceNumber,
1385 actconfig->interface[i]
1386 ->dev.driver->name,
1387 current->comm, u);
1388 status = -EBUSY;
1389 break;
1390 }
1391 }
1392 }
1393
1394 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1395 * so avoid usb_set_configuration()'s kick to sysfs
1396 */
1397 if (status == 0) {
1398 if (actconfig && actconfig->desc.bConfigurationValue == u)
1399 status = usb_reset_configuration(ps->dev);
1400 else
1401 status = usb_set_configuration(ps->dev, u);
1402 }
1403
1404 return status;
1405 }
1406
1407 static struct usb_memory *
1408 find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
1409 {
1410 struct usb_memory *usbm = NULL, *iter;
1411 unsigned long flags;
1412 unsigned long uurb_start = (unsigned long)uurb->buffer;
1413
1414 spin_lock_irqsave(&ps->lock, flags);
1415 list_for_each_entry(iter, &ps->memory_list, memlist) {
1416 if (uurb_start >= iter->vm_start &&
1417 uurb_start < iter->vm_start + iter->size) {
1418 if (uurb->buffer_length > iter->vm_start + iter->size -
1419 uurb_start) {
1420 usbm = ERR_PTR(-EINVAL);
1421 } else {
1422 usbm = iter;
1423 usbm->urb_use_count++;
1424 }
1425 break;
1426 }
1427 }
1428 spin_unlock_irqrestore(&ps->lock, flags);
1429 return usbm;
1430 }
1431
1432 static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1433 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1434 void __user *arg)
1435 {
1436 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1437 struct usb_host_endpoint *ep;
1438 struct async *as = NULL;
1439 struct usb_ctrlrequest *dr = NULL;
1440 unsigned int u, totlen, isofrmlen;
1441 int i, ret, is_in, num_sgs = 0, ifnum = -1;
1442 int number_of_packets = 0;
1443 unsigned int stream_id = 0;
1444 void *buf;
1445 unsigned long mask = USBDEVFS_URB_SHORT_NOT_OK |
1446 USBDEVFS_URB_BULK_CONTINUATION |
1447 USBDEVFS_URB_NO_FSBR |
1448 USBDEVFS_URB_ZERO_PACKET |
1449 USBDEVFS_URB_NO_INTERRUPT;
1450 /* USBDEVFS_URB_ISO_ASAP is a special case */
1451 if (uurb->type == USBDEVFS_URB_TYPE_ISO)
1452 mask |= USBDEVFS_URB_ISO_ASAP;
1453
1454 if (uurb->flags & ~mask)
1455 return -EINVAL;
1456
1457 if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
1458 return -EINVAL;
1459 if (uurb->buffer_length > 0 && !uurb->buffer)
1460 return -EINVAL;
1461 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1462 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1463 ifnum = findintfep(ps->dev, uurb->endpoint);
1464 if (ifnum < 0)
1465 return ifnum;
1466 ret = checkintf(ps, ifnum);
1467 if (ret)
1468 return ret;
1469 }
1470 ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1471 if (!ep)
1472 return -ENOENT;
1473 is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1474
1475 u = 0;
1476 switch (uurb->type) {
1477 case USBDEVFS_URB_TYPE_CONTROL:
1478 if (!usb_endpoint_xfer_control(&ep->desc))
1479 return -EINVAL;
1480 /* min 8 byte setup packet */
1481 if (uurb->buffer_length < 8)
1482 return -EINVAL;
1483 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1484 if (!dr)
1485 return -ENOMEM;
1486 if (copy_from_user(dr, uurb->buffer, 8)) {
1487 ret = -EFAULT;
1488 goto error;
1489 }
1490 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1491 ret = -EINVAL;
1492 goto error;
1493 }
1494 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1495 le16_to_cpup(&dr->wIndex));
1496 if (ret)
1497 goto error;
1498 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1499 uurb->buffer += 8;
1500 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1501 is_in = 1;
1502 uurb->endpoint |= USB_DIR_IN;
1503 } else {
1504 is_in = 0;
1505 uurb->endpoint &= ~USB_DIR_IN;
1506 }
1507 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1508 "bRequest=%02x wValue=%04x "
1509 "wIndex=%04x wLength=%04x\n",
1510 dr->bRequestType, dr->bRequest,
1511 __le16_to_cpup(&dr->wValue),
1512 __le16_to_cpup(&dr->wIndex),
1513 __le16_to_cpup(&dr->wLength));
1514 u = sizeof(struct usb_ctrlrequest);
1515 break;
1516
1517 case USBDEVFS_URB_TYPE_BULK:
1518 switch (usb_endpoint_type(&ep->desc)) {
1519 case USB_ENDPOINT_XFER_CONTROL:
1520 case USB_ENDPOINT_XFER_ISOC:
1521 return -EINVAL;
1522 case USB_ENDPOINT_XFER_INT:
1523 /* allow single-shot interrupt transfers */
1524 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1525 goto interrupt_urb;
1526 }
1527 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1528 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1529 num_sgs = 0;
1530 if (ep->streams)
1531 stream_id = uurb->stream_id;
1532 break;
1533
1534 case USBDEVFS_URB_TYPE_INTERRUPT:
1535 if (!usb_endpoint_xfer_int(&ep->desc))
1536 return -EINVAL;
1537 interrupt_urb:
1538 break;
1539
1540 case USBDEVFS_URB_TYPE_ISO:
1541 /* arbitrary limit */
1542 if (uurb->number_of_packets < 1 ||
1543 uurb->number_of_packets > 128)
1544 return -EINVAL;
1545 if (!usb_endpoint_xfer_isoc(&ep->desc))
1546 return -EINVAL;
1547 number_of_packets = uurb->number_of_packets;
1548 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1549 number_of_packets;
1550 isopkt = memdup_user(iso_frame_desc, isofrmlen);
1551 if (IS_ERR(isopkt)) {
1552 ret = PTR_ERR(isopkt);
1553 isopkt = NULL;
1554 goto error;
1555 }
1556 for (totlen = u = 0; u < number_of_packets; u++) {
1557 /*
1558 * arbitrary limit need for USB 3.0
1559 * bMaxBurst (0~15 allowed, 1~16 packets)
1560 * bmAttributes (bit 1:0, mult 0~2, 1~3 packets)
1561 * sizemax: 1024 * 16 * 3 = 49152
1562 */
1563 if (isopkt[u].length > 49152) {
1564 ret = -EINVAL;
1565 goto error;
1566 }
1567 totlen += isopkt[u].length;
1568 }
1569 u *= sizeof(struct usb_iso_packet_descriptor);
1570 uurb->buffer_length = totlen;
1571 break;
1572
1573 default:
1574 return -EINVAL;
1575 }
1576
1577 if (uurb->buffer_length > 0 &&
1578 !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1579 uurb->buffer, uurb->buffer_length)) {
1580 ret = -EFAULT;
1581 goto error;
1582 }
1583 as = alloc_async(number_of_packets);
1584 if (!as) {
1585 ret = -ENOMEM;
1586 goto error;
1587 }
1588
1589 as->usbm = find_memory_area(ps, uurb);
1590 if (IS_ERR(as->usbm)) {
1591 ret = PTR_ERR(as->usbm);
1592 as->usbm = NULL;
1593 goto error;
1594 }
1595
1596 /* do not use SG buffers when memory mapped segments
1597 * are in use
1598 */
1599 if (as->usbm)
1600 num_sgs = 0;
1601
1602 u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1603 num_sgs * sizeof(struct scatterlist);
1604 ret = usbfs_increase_memory_usage(u);
1605 if (ret)
1606 goto error;
1607 as->mem_usage = u;
1608
1609 if (num_sgs) {
1610 as->urb->sg = kmalloc(num_sgs * sizeof(struct scatterlist),
1611 GFP_KERNEL);
1612 if (!as->urb->sg) {
1613 ret = -ENOMEM;
1614 goto error;
1615 }
1616 as->urb->num_sgs = num_sgs;
1617 sg_init_table(as->urb->sg, as->urb->num_sgs);
1618
1619 totlen = uurb->buffer_length;
1620 for (i = 0; i < as->urb->num_sgs; i++) {
1621 u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1622 buf = kmalloc(u, GFP_KERNEL);
1623 if (!buf) {
1624 ret = -ENOMEM;
1625 goto error;
1626 }
1627 sg_set_buf(&as->urb->sg[i], buf, u);
1628
1629 if (!is_in) {
1630 if (copy_from_user(buf, uurb->buffer, u)) {
1631 ret = -EFAULT;
1632 goto error;
1633 }
1634 uurb->buffer += u;
1635 }
1636 totlen -= u;
1637 }
1638 } else if (uurb->buffer_length > 0) {
1639 if (as->usbm) {
1640 unsigned long uurb_start = (unsigned long)uurb->buffer;
1641
1642 as->urb->transfer_buffer = as->usbm->mem +
1643 (uurb_start - as->usbm->vm_start);
1644 } else {
1645 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1646 GFP_KERNEL);
1647 if (!as->urb->transfer_buffer) {
1648 ret = -ENOMEM;
1649 goto error;
1650 }
1651 if (!is_in) {
1652 if (copy_from_user(as->urb->transfer_buffer,
1653 uurb->buffer,
1654 uurb->buffer_length)) {
1655 ret = -EFAULT;
1656 goto error;
1657 }
1658 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1659 /*
1660 * Isochronous input data may end up being
1661 * discontiguous if some of the packets are
1662 * short. Clear the buffer so that the gaps
1663 * don't leak kernel data to userspace.
1664 */
1665 memset(as->urb->transfer_buffer, 0,
1666 uurb->buffer_length);
1667 }
1668 }
1669 }
1670 as->urb->dev = ps->dev;
1671 as->urb->pipe = (uurb->type << 30) |
1672 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1673 (uurb->endpoint & USB_DIR_IN);
1674
1675 /* This tedious sequence is necessary because the URB_* flags
1676 * are internal to the kernel and subject to change, whereas
1677 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1678 */
1679 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1680 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1681 u |= URB_ISO_ASAP;
1682 if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK && is_in)
1683 u |= URB_SHORT_NOT_OK;
1684 if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1685 u |= URB_NO_FSBR;
1686 if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1687 u |= URB_ZERO_PACKET;
1688 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1689 u |= URB_NO_INTERRUPT;
1690 as->urb->transfer_flags = u;
1691
1692 as->urb->transfer_buffer_length = uurb->buffer_length;
1693 as->urb->setup_packet = (unsigned char *)dr;
1694 dr = NULL;
1695 as->urb->start_frame = uurb->start_frame;
1696 as->urb->number_of_packets = number_of_packets;
1697 as->urb->stream_id = stream_id;
1698
1699 if (ep->desc.bInterval) {
1700 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1701 ps->dev->speed == USB_SPEED_HIGH ||
1702 ps->dev->speed >= USB_SPEED_SUPER)
1703 as->urb->interval = 1 <<
1704 min(15, ep->desc.bInterval - 1);
1705 else
1706 as->urb->interval = ep->desc.bInterval;
1707 }
1708
1709 as->urb->context = as;
1710 as->urb->complete = async_completed;
1711 for (totlen = u = 0; u < number_of_packets; u++) {
1712 as->urb->iso_frame_desc[u].offset = totlen;
1713 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1714 totlen += isopkt[u].length;
1715 }
1716 kfree(isopkt);
1717 isopkt = NULL;
1718 as->ps = ps;
1719 as->userurb = arg;
1720 if (as->usbm) {
1721 unsigned long uurb_start = (unsigned long)uurb->buffer;
1722
1723 as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1724 as->urb->transfer_dma = as->usbm->dma_handle +
1725 (uurb_start - as->usbm->vm_start);
1726 } else if (is_in && uurb->buffer_length > 0)
1727 as->userbuffer = uurb->buffer;
1728 as->signr = uurb->signr;
1729 as->ifnum = ifnum;
1730 as->pid = get_pid(task_pid(current));
1731 as->cred = get_current_cred();
1732 security_task_getsecid(current, &as->secid);
1733 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1734 as->urb->transfer_buffer_length, 0, SUBMIT,
1735 NULL, 0);
1736 if (!is_in)
1737 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1738
1739 async_newpending(as);
1740
1741 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1742 spin_lock_irq(&ps->lock);
1743
1744 /* Not exactly the endpoint address; the direction bit is
1745 * shifted to the 0x10 position so that the value will be
1746 * between 0 and 31.
1747 */
1748 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1749 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1750 >> 3);
1751
1752 /* If this bulk URB is the start of a new transfer, re-enable
1753 * the endpoint. Otherwise mark it as a continuation URB.
1754 */
1755 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1756 as->bulk_status = AS_CONTINUATION;
1757 else
1758 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1759
1760 /* Don't accept continuation URBs if the endpoint is
1761 * disabled because of an earlier error.
1762 */
1763 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1764 ret = -EREMOTEIO;
1765 else
1766 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1767 spin_unlock_irq(&ps->lock);
1768 } else {
1769 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1770 }
1771
1772 if (ret) {
1773 dev_printk(KERN_DEBUG, &ps->dev->dev,
1774 "usbfs: usb_submit_urb returned %d\n", ret);
1775 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1776 0, ret, COMPLETE, NULL, 0);
1777 async_removepending(as);
1778 goto error;
1779 }
1780 return 0;
1781
1782 error:
1783 if (as && as->usbm)
1784 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
1785 kfree(isopkt);
1786 kfree(dr);
1787 if (as)
1788 free_async(as);
1789 return ret;
1790 }
1791
1792 static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1793 {
1794 struct usbdevfs_urb uurb;
1795
1796 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1797 return -EFAULT;
1798
1799 return proc_do_submiturb(ps, &uurb,
1800 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1801 arg);
1802 }
1803
1804 static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1805 {
1806 struct urb *urb;
1807 struct async *as;
1808 unsigned long flags;
1809
1810 spin_lock_irqsave(&ps->lock, flags);
1811 as = async_getpending(ps, arg);
1812 if (!as) {
1813 spin_unlock_irqrestore(&ps->lock, flags);
1814 return -EINVAL;
1815 }
1816
1817 urb = as->urb;
1818 usb_get_urb(urb);
1819 spin_unlock_irqrestore(&ps->lock, flags);
1820
1821 usb_kill_urb(urb);
1822 usb_put_urb(urb);
1823
1824 return 0;
1825 }
1826
1827 static void compute_isochronous_actual_length(struct urb *urb)
1828 {
1829 unsigned int i;
1830
1831 if (urb->number_of_packets > 0) {
1832 urb->actual_length = 0;
1833 for (i = 0; i < urb->number_of_packets; i++)
1834 urb->actual_length +=
1835 urb->iso_frame_desc[i].actual_length;
1836 }
1837 }
1838
1839 static int processcompl(struct async *as, void __user * __user *arg)
1840 {
1841 struct urb *urb = as->urb;
1842 struct usbdevfs_urb __user *userurb = as->userurb;
1843 void __user *addr = as->userurb;
1844 unsigned int i;
1845
1846 compute_isochronous_actual_length(urb);
1847 if (as->userbuffer && urb->actual_length) {
1848 if (copy_urb_data_to_user(as->userbuffer, urb))
1849 goto err_out;
1850 }
1851 if (put_user(as->status, &userurb->status))
1852 goto err_out;
1853 if (put_user(urb->actual_length, &userurb->actual_length))
1854 goto err_out;
1855 if (put_user(urb->error_count, &userurb->error_count))
1856 goto err_out;
1857
1858 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1859 for (i = 0; i < urb->number_of_packets; i++) {
1860 if (put_user(urb->iso_frame_desc[i].actual_length,
1861 &userurb->iso_frame_desc[i].actual_length))
1862 goto err_out;
1863 if (put_user(urb->iso_frame_desc[i].status,
1864 &userurb->iso_frame_desc[i].status))
1865 goto err_out;
1866 }
1867 }
1868
1869 if (put_user(addr, (void __user * __user *)arg))
1870 return -EFAULT;
1871 return 0;
1872
1873 err_out:
1874 return -EFAULT;
1875 }
1876
1877 static struct async *reap_as(struct usb_dev_state *ps)
1878 {
1879 DECLARE_WAITQUEUE(wait, current);
1880 struct async *as = NULL;
1881 struct usb_device *dev = ps->dev;
1882
1883 add_wait_queue(&ps->wait, &wait);
1884 for (;;) {
1885 __set_current_state(TASK_INTERRUPTIBLE);
1886 as = async_getcompleted(ps);
1887 if (as || !connected(ps))
1888 break;
1889 if (signal_pending(current))
1890 break;
1891 usb_unlock_device(dev);
1892 schedule();
1893 usb_lock_device(dev);
1894 }
1895 remove_wait_queue(&ps->wait, &wait);
1896 set_current_state(TASK_RUNNING);
1897 return as;
1898 }
1899
1900 static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
1901 {
1902 struct async *as = reap_as(ps);
1903
1904 if (as) {
1905 int retval;
1906
1907 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
1908 retval = processcompl(as, (void __user * __user *)arg);
1909 free_async(as);
1910 return retval;
1911 }
1912 if (signal_pending(current))
1913 return -EINTR;
1914 return -ENODEV;
1915 }
1916
1917 static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
1918 {
1919 int retval;
1920 struct async *as;
1921
1922 as = async_getcompleted(ps);
1923 if (as) {
1924 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
1925 retval = processcompl(as, (void __user * __user *)arg);
1926 free_async(as);
1927 } else {
1928 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1929 }
1930 return retval;
1931 }
1932
1933 #ifdef CONFIG_COMPAT
1934 static int proc_control_compat(struct usb_dev_state *ps,
1935 struct usbdevfs_ctrltransfer32 __user *p32)
1936 {
1937 struct usbdevfs_ctrltransfer __user *p;
1938 __u32 udata;
1939 p = compat_alloc_user_space(sizeof(*p));
1940 if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1941 get_user(udata, &p32->data) ||
1942 put_user(compat_ptr(udata), &p->data))
1943 return -EFAULT;
1944 return proc_control(ps, p);
1945 }
1946
1947 static int proc_bulk_compat(struct usb_dev_state *ps,
1948 struct usbdevfs_bulktransfer32 __user *p32)
1949 {
1950 struct usbdevfs_bulktransfer __user *p;
1951 compat_uint_t n;
1952 compat_caddr_t addr;
1953
1954 p = compat_alloc_user_space(sizeof(*p));
1955
1956 if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1957 get_user(n, &p32->len) || put_user(n, &p->len) ||
1958 get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1959 get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1960 return -EFAULT;
1961
1962 return proc_bulk(ps, p);
1963 }
1964 static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
1965 {
1966 struct usbdevfs_disconnectsignal32 ds;
1967
1968 if (copy_from_user(&ds, arg, sizeof(ds)))
1969 return -EFAULT;
1970 ps->discsignr = ds.signr;
1971 ps->disccontext = compat_ptr(ds.context);
1972 return 0;
1973 }
1974
1975 static int get_urb32(struct usbdevfs_urb *kurb,
1976 struct usbdevfs_urb32 __user *uurb)
1977 {
1978 struct usbdevfs_urb32 urb32;
1979 if (copy_from_user(&urb32, uurb, sizeof(*uurb)))
1980 return -EFAULT;
1981 kurb->type = urb32.type;
1982 kurb->endpoint = urb32.endpoint;
1983 kurb->status = urb32.status;
1984 kurb->flags = urb32.flags;
1985 kurb->buffer = compat_ptr(urb32.buffer);
1986 kurb->buffer_length = urb32.buffer_length;
1987 kurb->actual_length = urb32.actual_length;
1988 kurb->start_frame = urb32.start_frame;
1989 kurb->number_of_packets = urb32.number_of_packets;
1990 kurb->error_count = urb32.error_count;
1991 kurb->signr = urb32.signr;
1992 kurb->usercontext = compat_ptr(urb32.usercontext);
1993 return 0;
1994 }
1995
1996 static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
1997 {
1998 struct usbdevfs_urb uurb;
1999
2000 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
2001 return -EFAULT;
2002
2003 return proc_do_submiturb(ps, &uurb,
2004 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
2005 arg);
2006 }
2007
2008 static int processcompl_compat(struct async *as, void __user * __user *arg)
2009 {
2010 struct urb *urb = as->urb;
2011 struct usbdevfs_urb32 __user *userurb = as->userurb;
2012 void __user *addr = as->userurb;
2013 unsigned int i;
2014
2015 compute_isochronous_actual_length(urb);
2016 if (as->userbuffer && urb->actual_length) {
2017 if (copy_urb_data_to_user(as->userbuffer, urb))
2018 return -EFAULT;
2019 }
2020 if (put_user(as->status, &userurb->status))
2021 return -EFAULT;
2022 if (put_user(urb->actual_length, &userurb->actual_length))
2023 return -EFAULT;
2024 if (put_user(urb->error_count, &userurb->error_count))
2025 return -EFAULT;
2026
2027 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2028 for (i = 0; i < urb->number_of_packets; i++) {
2029 if (put_user(urb->iso_frame_desc[i].actual_length,
2030 &userurb->iso_frame_desc[i].actual_length))
2031 return -EFAULT;
2032 if (put_user(urb->iso_frame_desc[i].status,
2033 &userurb->iso_frame_desc[i].status))
2034 return -EFAULT;
2035 }
2036 }
2037
2038 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2039 return -EFAULT;
2040 return 0;
2041 }
2042
2043 static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
2044 {
2045 struct async *as = reap_as(ps);
2046
2047 if (as) {
2048 int retval;
2049
2050 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
2051 retval = processcompl_compat(as, (void __user * __user *)arg);
2052 free_async(as);
2053 return retval;
2054 }
2055 if (signal_pending(current))
2056 return -EINTR;
2057 return -ENODEV;
2058 }
2059
2060 static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
2061 {
2062 int retval;
2063 struct async *as;
2064
2065 as = async_getcompleted(ps);
2066 if (as) {
2067 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
2068 retval = processcompl_compat(as, (void __user * __user *)arg);
2069 free_async(as);
2070 } else {
2071 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2072 }
2073 return retval;
2074 }
2075
2076
2077 #endif
2078
2079 static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
2080 {
2081 struct usbdevfs_disconnectsignal ds;
2082
2083 if (copy_from_user(&ds, arg, sizeof(ds)))
2084 return -EFAULT;
2085 ps->discsignr = ds.signr;
2086 ps->disccontext = ds.context;
2087 return 0;
2088 }
2089
2090 static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
2091 {
2092 unsigned int ifnum;
2093
2094 if (get_user(ifnum, (unsigned int __user *)arg))
2095 return -EFAULT;
2096 return claimintf(ps, ifnum);
2097 }
2098
2099 static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
2100 {
2101 unsigned int ifnum;
2102 int ret;
2103
2104 if (get_user(ifnum, (unsigned int __user *)arg))
2105 return -EFAULT;
2106 ret = releaseintf(ps, ifnum);
2107 if (ret < 0)
2108 return ret;
2109 destroy_async_on_interface(ps, ifnum);
2110 return 0;
2111 }
2112
2113 static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
2114 {
2115 int size;
2116 void *buf = NULL;
2117 int retval = 0;
2118 struct usb_interface *intf = NULL;
2119 struct usb_driver *driver = NULL;
2120
2121 if (ps->privileges_dropped)
2122 return -EACCES;
2123
2124 /* alloc buffer */
2125 size = _IOC_SIZE(ctl->ioctl_code);
2126 if (size > 0) {
2127 buf = kmalloc(size, GFP_KERNEL);
2128 if (buf == NULL)
2129 return -ENOMEM;
2130 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2131 if (copy_from_user(buf, ctl->data, size)) {
2132 kfree(buf);
2133 return -EFAULT;
2134 }
2135 } else {
2136 memset(buf, 0, size);
2137 }
2138 }
2139
2140 if (!connected(ps)) {
2141 kfree(buf);
2142 return -ENODEV;
2143 }
2144
2145 if (ps->dev->state != USB_STATE_CONFIGURED)
2146 retval = -EHOSTUNREACH;
2147 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
2148 retval = -EINVAL;
2149 else switch (ctl->ioctl_code) {
2150
2151 /* disconnect kernel driver from interface */
2152 case USBDEVFS_DISCONNECT:
2153 if (intf->dev.driver) {
2154 driver = to_usb_driver(intf->dev.driver);
2155 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2156 usb_driver_release_interface(driver, intf);
2157 } else
2158 retval = -ENODATA;
2159 break;
2160
2161 /* let kernel drivers try to (re)bind to the interface */
2162 case USBDEVFS_CONNECT:
2163 if (!intf->dev.driver)
2164 retval = device_attach(&intf->dev);
2165 else
2166 retval = -EBUSY;
2167 break;
2168
2169 /* talk directly to the interface's driver */
2170 default:
2171 if (intf->dev.driver)
2172 driver = to_usb_driver(intf->dev.driver);
2173 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2174 retval = -ENOTTY;
2175 } else {
2176 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2177 if (retval == -ENOIOCTLCMD)
2178 retval = -ENOTTY;
2179 }
2180 }
2181
2182 /* cleanup and return */
2183 if (retval >= 0
2184 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2185 && size > 0
2186 && copy_to_user(ctl->data, buf, size) != 0)
2187 retval = -EFAULT;
2188
2189 kfree(buf);
2190 return retval;
2191 }
2192
2193 static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2194 {
2195 struct usbdevfs_ioctl ctrl;
2196
2197 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2198 return -EFAULT;
2199 return proc_ioctl(ps, &ctrl);
2200 }
2201
2202 #ifdef CONFIG_COMPAT
2203 static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2204 {
2205 struct usbdevfs_ioctl32 ioc32;
2206 struct usbdevfs_ioctl ctrl;
2207
2208 if (copy_from_user(&ioc32, compat_ptr(arg), sizeof(ioc32)))
2209 return -EFAULT;
2210 ctrl.ifno = ioc32.ifno;
2211 ctrl.ioctl_code = ioc32.ioctl_code;
2212 ctrl.data = compat_ptr(ioc32.data);
2213 return proc_ioctl(ps, &ctrl);
2214 }
2215 #endif
2216
2217 static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2218 {
2219 unsigned portnum;
2220 int rc;
2221
2222 if (get_user(portnum, (unsigned __user *) arg))
2223 return -EFAULT;
2224 rc = usb_hub_claim_port(ps->dev, portnum, ps);
2225 if (rc == 0)
2226 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2227 portnum, task_pid_nr(current), current->comm);
2228 return rc;
2229 }
2230
2231 static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2232 {
2233 unsigned portnum;
2234
2235 if (get_user(portnum, (unsigned __user *) arg))
2236 return -EFAULT;
2237 return usb_hub_release_port(ps->dev, portnum, ps);
2238 }
2239
2240 static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2241 {
2242 __u32 caps;
2243
2244 caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2245 USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
2246 USBDEVFS_CAP_DROP_PRIVILEGES;
2247 if (!ps->dev->bus->no_stop_on_short)
2248 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2249 if (ps->dev->bus->sg_tablesize)
2250 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2251
2252 if (put_user(caps, (__u32 __user *)arg))
2253 return -EFAULT;
2254
2255 return 0;
2256 }
2257
2258 static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2259 {
2260 struct usbdevfs_disconnect_claim dc;
2261 struct usb_interface *intf;
2262
2263 if (copy_from_user(&dc, arg, sizeof(dc)))
2264 return -EFAULT;
2265
2266 intf = usb_ifnum_to_if(ps->dev, dc.interface);
2267 if (!intf)
2268 return -EINVAL;
2269
2270 if (intf->dev.driver) {
2271 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2272
2273 if (ps->privileges_dropped)
2274 return -EACCES;
2275
2276 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2277 strncmp(dc.driver, intf->dev.driver->name,
2278 sizeof(dc.driver)) != 0)
2279 return -EBUSY;
2280
2281 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2282 strncmp(dc.driver, intf->dev.driver->name,
2283 sizeof(dc.driver)) == 0)
2284 return -EBUSY;
2285
2286 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2287 usb_driver_release_interface(driver, intf);
2288 }
2289
2290 return claimintf(ps, dc.interface);
2291 }
2292
2293 static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2294 {
2295 unsigned num_streams, num_eps;
2296 struct usb_host_endpoint **eps;
2297 struct usb_interface *intf;
2298 int r;
2299
2300 r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2301 &eps, &intf);
2302 if (r)
2303 return r;
2304
2305 destroy_async_on_interface(ps,
2306 intf->altsetting[0].desc.bInterfaceNumber);
2307
2308 r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2309 kfree(eps);
2310 return r;
2311 }
2312
2313 static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2314 {
2315 unsigned num_eps;
2316 struct usb_host_endpoint **eps;
2317 struct usb_interface *intf;
2318 int r;
2319
2320 r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2321 if (r)
2322 return r;
2323
2324 destroy_async_on_interface(ps,
2325 intf->altsetting[0].desc.bInterfaceNumber);
2326
2327 r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2328 kfree(eps);
2329 return r;
2330 }
2331
2332 static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
2333 {
2334 u32 data;
2335
2336 if (copy_from_user(&data, arg, sizeof(data)))
2337 return -EFAULT;
2338
2339 /* This is a one way operation. Once privileges are
2340 * dropped, you cannot regain them. You may however reissue
2341 * this ioctl to shrink the allowed interfaces mask.
2342 */
2343 ps->interface_allowed_mask &= data;
2344 ps->privileges_dropped = true;
2345
2346 return 0;
2347 }
2348
2349 /*
2350 * NOTE: All requests here that have interface numbers as parameters
2351 * are assuming that somehow the configuration has been prevented from
2352 * changing. But there's no mechanism to ensure that...
2353 */
2354 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2355 void __user *p)
2356 {
2357 struct usb_dev_state *ps = file->private_data;
2358 struct inode *inode = file_inode(file);
2359 struct usb_device *dev = ps->dev;
2360 int ret = -ENOTTY;
2361
2362 if (!(file->f_mode & FMODE_WRITE))
2363 return -EPERM;
2364
2365 usb_lock_device(dev);
2366
2367 /* Reap operations are allowed even after disconnection */
2368 switch (cmd) {
2369 case USBDEVFS_REAPURB:
2370 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2371 ret = proc_reapurb(ps, p);
2372 goto done;
2373
2374 case USBDEVFS_REAPURBNDELAY:
2375 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2376 ret = proc_reapurbnonblock(ps, p);
2377 goto done;
2378
2379 #ifdef CONFIG_COMPAT
2380 case USBDEVFS_REAPURB32:
2381 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2382 ret = proc_reapurb_compat(ps, p);
2383 goto done;
2384
2385 case USBDEVFS_REAPURBNDELAY32:
2386 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2387 ret = proc_reapurbnonblock_compat(ps, p);
2388 goto done;
2389 #endif
2390 }
2391
2392 if (!connected(ps)) {
2393 usb_unlock_device(dev);
2394 return -ENODEV;
2395 }
2396
2397 switch (cmd) {
2398 case USBDEVFS_CONTROL:
2399 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2400 ret = proc_control(ps, p);
2401 if (ret >= 0)
2402 inode->i_mtime = current_time(inode);
2403 break;
2404
2405 case USBDEVFS_BULK:
2406 snoop(&dev->dev, "%s: BULK\n", __func__);
2407 ret = proc_bulk(ps, p);
2408 if (ret >= 0)
2409 inode->i_mtime = current_time(inode);
2410 break;
2411
2412 case USBDEVFS_RESETEP:
2413 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2414 ret = proc_resetep(ps, p);
2415 if (ret >= 0)
2416 inode->i_mtime = current_time(inode);
2417 break;
2418
2419 case USBDEVFS_RESET:
2420 snoop(&dev->dev, "%s: RESET\n", __func__);
2421 ret = proc_resetdevice(ps);
2422 break;
2423
2424 case USBDEVFS_CLEAR_HALT:
2425 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2426 ret = proc_clearhalt(ps, p);
2427 if (ret >= 0)
2428 inode->i_mtime = current_time(inode);
2429 break;
2430
2431 case USBDEVFS_GETDRIVER:
2432 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2433 ret = proc_getdriver(ps, p);
2434 break;
2435
2436 case USBDEVFS_CONNECTINFO:
2437 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2438 ret = proc_connectinfo(ps, p);
2439 break;
2440
2441 case USBDEVFS_SETINTERFACE:
2442 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2443 ret = proc_setintf(ps, p);
2444 break;
2445
2446 case USBDEVFS_SETCONFIGURATION:
2447 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2448 ret = proc_setconfig(ps, p);
2449 break;
2450
2451 case USBDEVFS_SUBMITURB:
2452 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2453 ret = proc_submiturb(ps, p);
2454 if (ret >= 0)
2455 inode->i_mtime = current_time(inode);
2456 break;
2457
2458 #ifdef CONFIG_COMPAT
2459 case USBDEVFS_CONTROL32:
2460 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2461 ret = proc_control_compat(ps, p);
2462 if (ret >= 0)
2463 inode->i_mtime = current_time(inode);
2464 break;
2465
2466 case USBDEVFS_BULK32:
2467 snoop(&dev->dev, "%s: BULK32\n", __func__);
2468 ret = proc_bulk_compat(ps, p);
2469 if (ret >= 0)
2470 inode->i_mtime = current_time(inode);
2471 break;
2472
2473 case USBDEVFS_DISCSIGNAL32:
2474 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2475 ret = proc_disconnectsignal_compat(ps, p);
2476 break;
2477
2478 case USBDEVFS_SUBMITURB32:
2479 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2480 ret = proc_submiturb_compat(ps, p);
2481 if (ret >= 0)
2482 inode->i_mtime = current_time(inode);
2483 break;
2484
2485 case USBDEVFS_IOCTL32:
2486 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2487 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2488 break;
2489 #endif
2490
2491 case USBDEVFS_DISCARDURB:
2492 snoop(&dev->dev, "%s: DISCARDURB %pK\n", __func__, p);
2493 ret = proc_unlinkurb(ps, p);
2494 break;
2495
2496 case USBDEVFS_DISCSIGNAL:
2497 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2498 ret = proc_disconnectsignal(ps, p);
2499 break;
2500
2501 case USBDEVFS_CLAIMINTERFACE:
2502 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2503 ret = proc_claiminterface(ps, p);
2504 break;
2505
2506 case USBDEVFS_RELEASEINTERFACE:
2507 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2508 ret = proc_releaseinterface(ps, p);
2509 break;
2510
2511 case USBDEVFS_IOCTL:
2512 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2513 ret = proc_ioctl_default(ps, p);
2514 break;
2515
2516 case USBDEVFS_CLAIM_PORT:
2517 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2518 ret = proc_claim_port(ps, p);
2519 break;
2520
2521 case USBDEVFS_RELEASE_PORT:
2522 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2523 ret = proc_release_port(ps, p);
2524 break;
2525 case USBDEVFS_GET_CAPABILITIES:
2526 ret = proc_get_capabilities(ps, p);
2527 break;
2528 case USBDEVFS_DISCONNECT_CLAIM:
2529 ret = proc_disconnect_claim(ps, p);
2530 break;
2531 case USBDEVFS_ALLOC_STREAMS:
2532 ret = proc_alloc_streams(ps, p);
2533 break;
2534 case USBDEVFS_FREE_STREAMS:
2535 ret = proc_free_streams(ps, p);
2536 break;
2537 case USBDEVFS_DROP_PRIVILEGES:
2538 ret = proc_drop_privileges(ps, p);
2539 break;
2540 case USBDEVFS_GET_SPEED:
2541 ret = ps->dev->speed;
2542 break;
2543 }
2544
2545 done:
2546 usb_unlock_device(dev);
2547 if (ret >= 0)
2548 inode->i_atime = current_time(inode);
2549 return ret;
2550 }
2551
2552 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2553 unsigned long arg)
2554 {
2555 int ret;
2556
2557 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2558
2559 return ret;
2560 }
2561
2562 #ifdef CONFIG_COMPAT
2563 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2564 unsigned long arg)
2565 {
2566 int ret;
2567
2568 ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2569
2570 return ret;
2571 }
2572 #endif
2573
2574 /* No kernel lock - fine */
2575 static unsigned int usbdev_poll(struct file *file,
2576 struct poll_table_struct *wait)
2577 {
2578 struct usb_dev_state *ps = file->private_data;
2579 unsigned int mask = 0;
2580
2581 poll_wait(file, &ps->wait, wait);
2582 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2583 mask |= POLLOUT | POLLWRNORM;
2584 if (!connected(ps))
2585 mask |= POLLHUP;
2586 if (list_empty(&ps->list))
2587 mask |= POLLERR;
2588 return mask;
2589 }
2590
2591 const struct file_operations usbdev_file_operations = {
2592 .owner = THIS_MODULE,
2593 .llseek = no_seek_end_llseek,
2594 .read = usbdev_read,
2595 .poll = usbdev_poll,
2596 .unlocked_ioctl = usbdev_ioctl,
2597 #ifdef CONFIG_COMPAT
2598 .compat_ioctl = usbdev_compat_ioctl,
2599 #endif
2600 .mmap = usbdev_mmap,
2601 .open = usbdev_open,
2602 .release = usbdev_release,
2603 };
2604
2605 static void usbdev_remove(struct usb_device *udev)
2606 {
2607 struct usb_dev_state *ps;
2608 struct siginfo sinfo;
2609
2610 while (!list_empty(&udev->filelist)) {
2611 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2612 destroy_all_async(ps);
2613 wake_up_all(&ps->wait);
2614 list_del_init(&ps->list);
2615 if (ps->discsignr) {
2616 memset(&sinfo, 0, sizeof(sinfo));
2617 sinfo.si_signo = ps->discsignr;
2618 sinfo.si_errno = EPIPE;
2619 sinfo.si_code = SI_ASYNCIO;
2620 sinfo.si_addr = ps->disccontext;
2621 kill_pid_info_as_cred(ps->discsignr, &sinfo,
2622 ps->disc_pid, ps->cred, ps->secid);
2623 }
2624 }
2625 }
2626
2627 static int usbdev_notify(struct notifier_block *self,
2628 unsigned long action, void *dev)
2629 {
2630 switch (action) {
2631 case USB_DEVICE_ADD:
2632 break;
2633 case USB_DEVICE_REMOVE:
2634 usbdev_remove(dev);
2635 break;
2636 }
2637 return NOTIFY_OK;
2638 }
2639
2640 static struct notifier_block usbdev_nb = {
2641 .notifier_call = usbdev_notify,
2642 };
2643
2644 static struct cdev usb_device_cdev;
2645
2646 int __init usb_devio_init(void)
2647 {
2648 int retval;
2649
2650 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2651 "usb_device");
2652 if (retval) {
2653 printk(KERN_ERR "Unable to register minors for usb_device\n");
2654 goto out;
2655 }
2656 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2657 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2658 if (retval) {
2659 printk(KERN_ERR "Unable to get usb_device major %d\n",
2660 USB_DEVICE_MAJOR);
2661 goto error_cdev;
2662 }
2663 usb_register_notify(&usbdev_nb);
2664 out:
2665 return retval;
2666
2667 error_cdev:
2668 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2669 goto out;
2670 }
2671
2672 void usb_devio_cleanup(void)
2673 {
2674 usb_unregister_notify(&usbdev_nb);
2675 cdev_del(&usb_device_cdev);
2676 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2677 }
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