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Merge tag 'io_uring-5.7-2020-05-22' of git://git.kernel.dk/linux-block
[thirdparty/linux.git] / 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/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 #ifdef CONFIG_PM
48 #define MAYBE_CAP_SUSPEND USBDEVFS_CAP_SUSPEND
49 #else
50 #define MAYBE_CAP_SUSPEND 0
51 #endif
52
53 #define USB_MAXBUS 64
54 #define USB_DEVICE_MAX (USB_MAXBUS * 128)
55 #define USB_SG_SIZE 16384 /* split-size for large txs */
56
57 /* Mutual exclusion for ps->list in resume vs. release and remove */
58 static DEFINE_MUTEX(usbfs_mutex);
59
60 struct usb_dev_state {
61 struct list_head list; /* state list */
62 struct usb_device *dev;
63 struct file *file;
64 spinlock_t lock; /* protects the async urb lists */
65 struct list_head async_pending;
66 struct list_head async_completed;
67 struct list_head memory_list;
68 wait_queue_head_t wait; /* wake up if a request completed */
69 wait_queue_head_t wait_for_resume; /* wake up upon runtime resume */
70 unsigned int discsignr;
71 struct pid *disc_pid;
72 const struct cred *cred;
73 sigval_t disccontext;
74 unsigned long ifclaimed;
75 u32 disabled_bulk_eps;
76 unsigned long interface_allowed_mask;
77 int not_yet_resumed;
78 bool suspend_allowed;
79 bool privileges_dropped;
80 };
81
82 struct usb_memory {
83 struct list_head memlist;
84 int vma_use_count;
85 int urb_use_count;
86 u32 size;
87 void *mem;
88 dma_addr_t dma_handle;
89 unsigned long vm_start;
90 struct usb_dev_state *ps;
91 };
92
93 struct async {
94 struct list_head asynclist;
95 struct usb_dev_state *ps;
96 struct pid *pid;
97 const struct cred *cred;
98 unsigned int signr;
99 unsigned int ifnum;
100 void __user *userbuffer;
101 void __user *userurb;
102 sigval_t userurb_sigval;
103 struct urb *urb;
104 struct usb_memory *usbm;
105 unsigned int mem_usage;
106 int status;
107 u8 bulk_addr;
108 u8 bulk_status;
109 };
110
111 static bool usbfs_snoop;
112 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
113 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
114
115 static unsigned usbfs_snoop_max = 65536;
116 module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR);
117 MODULE_PARM_DESC(usbfs_snoop_max,
118 "maximum number of bytes to print while snooping");
119
120 #define snoop(dev, format, arg...) \
121 do { \
122 if (usbfs_snoop) \
123 dev_info(dev, format, ## arg); \
124 } while (0)
125
126 enum snoop_when {
127 SUBMIT, COMPLETE
128 };
129
130 #define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
131
132 /* Limit on the total amount of memory we can allocate for transfers */
133 static u32 usbfs_memory_mb = 16;
134 module_param(usbfs_memory_mb, uint, 0644);
135 MODULE_PARM_DESC(usbfs_memory_mb,
136 "maximum MB allowed for usbfs buffers (0 = no limit)");
137
138 /* Hard limit, necessary to avoid arithmetic overflow */
139 #define USBFS_XFER_MAX (UINT_MAX / 2 - 1000000)
140
141 static atomic64_t usbfs_memory_usage; /* Total memory currently allocated */
142
143 /* Check whether it's okay to allocate more memory for a transfer */
144 static int usbfs_increase_memory_usage(u64 amount)
145 {
146 u64 lim;
147
148 lim = READ_ONCE(usbfs_memory_mb);
149 lim <<= 20;
150
151 atomic64_add(amount, &usbfs_memory_usage);
152
153 if (lim > 0 && atomic64_read(&usbfs_memory_usage) > lim) {
154 atomic64_sub(amount, &usbfs_memory_usage);
155 return -ENOMEM;
156 }
157
158 return 0;
159 }
160
161 /* Memory for a transfer is being deallocated */
162 static void usbfs_decrease_memory_usage(u64 amount)
163 {
164 atomic64_sub(amount, &usbfs_memory_usage);
165 }
166
167 static int connected(struct usb_dev_state *ps)
168 {
169 return (!list_empty(&ps->list) &&
170 ps->dev->state != USB_STATE_NOTATTACHED);
171 }
172
173 static void dec_usb_memory_use_count(struct usb_memory *usbm, int *count)
174 {
175 struct usb_dev_state *ps = usbm->ps;
176 unsigned long flags;
177
178 spin_lock_irqsave(&ps->lock, flags);
179 --*count;
180 if (usbm->urb_use_count == 0 && usbm->vma_use_count == 0) {
181 list_del(&usbm->memlist);
182 spin_unlock_irqrestore(&ps->lock, flags);
183
184 usb_free_coherent(ps->dev, usbm->size, usbm->mem,
185 usbm->dma_handle);
186 usbfs_decrease_memory_usage(
187 usbm->size + sizeof(struct usb_memory));
188 kfree(usbm);
189 } else {
190 spin_unlock_irqrestore(&ps->lock, flags);
191 }
192 }
193
194 static void usbdev_vm_open(struct vm_area_struct *vma)
195 {
196 struct usb_memory *usbm = vma->vm_private_data;
197 unsigned long flags;
198
199 spin_lock_irqsave(&usbm->ps->lock, flags);
200 ++usbm->vma_use_count;
201 spin_unlock_irqrestore(&usbm->ps->lock, flags);
202 }
203
204 static void usbdev_vm_close(struct vm_area_struct *vma)
205 {
206 struct usb_memory *usbm = vma->vm_private_data;
207
208 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
209 }
210
211 static const struct vm_operations_struct usbdev_vm_ops = {
212 .open = usbdev_vm_open,
213 .close = usbdev_vm_close
214 };
215
216 static int usbdev_mmap(struct file *file, struct vm_area_struct *vma)
217 {
218 struct usb_memory *usbm = NULL;
219 struct usb_dev_state *ps = file->private_data;
220 struct usb_hcd *hcd = bus_to_hcd(ps->dev->bus);
221 size_t size = vma->vm_end - vma->vm_start;
222 void *mem;
223 unsigned long flags;
224 dma_addr_t dma_handle;
225 int ret;
226
227 ret = usbfs_increase_memory_usage(size + sizeof(struct usb_memory));
228 if (ret)
229 goto error;
230
231 usbm = kzalloc(sizeof(struct usb_memory), GFP_KERNEL);
232 if (!usbm) {
233 ret = -ENOMEM;
234 goto error_decrease_mem;
235 }
236
237 mem = usb_alloc_coherent(ps->dev, size, GFP_USER | __GFP_NOWARN,
238 &dma_handle);
239 if (!mem) {
240 ret = -ENOMEM;
241 goto error_free_usbm;
242 }
243
244 memset(mem, 0, size);
245
246 usbm->mem = mem;
247 usbm->dma_handle = dma_handle;
248 usbm->size = size;
249 usbm->ps = ps;
250 usbm->vm_start = vma->vm_start;
251 usbm->vma_use_count = 1;
252 INIT_LIST_HEAD(&usbm->memlist);
253
254 if (hcd->localmem_pool || !hcd_uses_dma(hcd)) {
255 if (remap_pfn_range(vma, vma->vm_start,
256 virt_to_phys(usbm->mem) >> PAGE_SHIFT,
257 size, vma->vm_page_prot) < 0) {
258 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
259 return -EAGAIN;
260 }
261 } else {
262 if (dma_mmap_coherent(hcd->self.sysdev, vma, mem, dma_handle,
263 size)) {
264 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
265 return -EAGAIN;
266 }
267 }
268
269 vma->vm_flags |= VM_IO;
270 vma->vm_flags |= (VM_DONTEXPAND | VM_DONTDUMP);
271 vma->vm_ops = &usbdev_vm_ops;
272 vma->vm_private_data = usbm;
273
274 spin_lock_irqsave(&ps->lock, flags);
275 list_add_tail(&usbm->memlist, &ps->memory_list);
276 spin_unlock_irqrestore(&ps->lock, flags);
277
278 return 0;
279
280 error_free_usbm:
281 kfree(usbm);
282 error_decrease_mem:
283 usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
284 error:
285 return ret;
286 }
287
288 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
289 loff_t *ppos)
290 {
291 struct usb_dev_state *ps = file->private_data;
292 struct usb_device *dev = ps->dev;
293 ssize_t ret = 0;
294 unsigned len;
295 loff_t pos;
296 int i;
297
298 pos = *ppos;
299 usb_lock_device(dev);
300 if (!connected(ps)) {
301 ret = -ENODEV;
302 goto err;
303 } else if (pos < 0) {
304 ret = -EINVAL;
305 goto err;
306 }
307
308 if (pos < sizeof(struct usb_device_descriptor)) {
309 /* 18 bytes - fits on the stack */
310 struct usb_device_descriptor temp_desc;
311
312 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
313 le16_to_cpus(&temp_desc.bcdUSB);
314 le16_to_cpus(&temp_desc.idVendor);
315 le16_to_cpus(&temp_desc.idProduct);
316 le16_to_cpus(&temp_desc.bcdDevice);
317
318 len = sizeof(struct usb_device_descriptor) - pos;
319 if (len > nbytes)
320 len = nbytes;
321 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
322 ret = -EFAULT;
323 goto err;
324 }
325
326 *ppos += len;
327 buf += len;
328 nbytes -= len;
329 ret += len;
330 }
331
332 pos = sizeof(struct usb_device_descriptor);
333 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
334 struct usb_config_descriptor *config =
335 (struct usb_config_descriptor *)dev->rawdescriptors[i];
336 unsigned int length = le16_to_cpu(config->wTotalLength);
337
338 if (*ppos < pos + length) {
339
340 /* The descriptor may claim to be longer than it
341 * really is. Here is the actual allocated length. */
342 unsigned alloclen =
343 le16_to_cpu(dev->config[i].desc.wTotalLength);
344
345 len = length - (*ppos - pos);
346 if (len > nbytes)
347 len = nbytes;
348
349 /* Simply don't write (skip over) unallocated parts */
350 if (alloclen > (*ppos - pos)) {
351 alloclen -= (*ppos - pos);
352 if (copy_to_user(buf,
353 dev->rawdescriptors[i] + (*ppos - pos),
354 min(len, alloclen))) {
355 ret = -EFAULT;
356 goto err;
357 }
358 }
359
360 *ppos += len;
361 buf += len;
362 nbytes -= len;
363 ret += len;
364 }
365
366 pos += length;
367 }
368
369 err:
370 usb_unlock_device(dev);
371 return ret;
372 }
373
374 /*
375 * async list handling
376 */
377
378 static struct async *alloc_async(unsigned int numisoframes)
379 {
380 struct async *as;
381
382 as = kzalloc(sizeof(struct async), GFP_KERNEL);
383 if (!as)
384 return NULL;
385 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
386 if (!as->urb) {
387 kfree(as);
388 return NULL;
389 }
390 return as;
391 }
392
393 static void free_async(struct async *as)
394 {
395 int i;
396
397 put_pid(as->pid);
398 if (as->cred)
399 put_cred(as->cred);
400 for (i = 0; i < as->urb->num_sgs; i++) {
401 if (sg_page(&as->urb->sg[i]))
402 kfree(sg_virt(&as->urb->sg[i]));
403 }
404
405 kfree(as->urb->sg);
406 if (as->usbm == NULL)
407 kfree(as->urb->transfer_buffer);
408 else
409 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
410
411 kfree(as->urb->setup_packet);
412 usb_free_urb(as->urb);
413 usbfs_decrease_memory_usage(as->mem_usage);
414 kfree(as);
415 }
416
417 static void async_newpending(struct async *as)
418 {
419 struct usb_dev_state *ps = as->ps;
420 unsigned long flags;
421
422 spin_lock_irqsave(&ps->lock, flags);
423 list_add_tail(&as->asynclist, &ps->async_pending);
424 spin_unlock_irqrestore(&ps->lock, flags);
425 }
426
427 static void async_removepending(struct async *as)
428 {
429 struct usb_dev_state *ps = as->ps;
430 unsigned long flags;
431
432 spin_lock_irqsave(&ps->lock, flags);
433 list_del_init(&as->asynclist);
434 spin_unlock_irqrestore(&ps->lock, flags);
435 }
436
437 static struct async *async_getcompleted(struct usb_dev_state *ps)
438 {
439 unsigned long flags;
440 struct async *as = NULL;
441
442 spin_lock_irqsave(&ps->lock, flags);
443 if (!list_empty(&ps->async_completed)) {
444 as = list_entry(ps->async_completed.next, struct async,
445 asynclist);
446 list_del_init(&as->asynclist);
447 }
448 spin_unlock_irqrestore(&ps->lock, flags);
449 return as;
450 }
451
452 static struct async *async_getpending(struct usb_dev_state *ps,
453 void __user *userurb)
454 {
455 struct async *as;
456
457 list_for_each_entry(as, &ps->async_pending, asynclist)
458 if (as->userurb == userurb) {
459 list_del_init(&as->asynclist);
460 return as;
461 }
462
463 return NULL;
464 }
465
466 static void snoop_urb(struct usb_device *udev,
467 void __user *userurb, int pipe, unsigned length,
468 int timeout_or_status, enum snoop_when when,
469 unsigned char *data, unsigned data_len)
470 {
471 static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
472 static const char *dirs[] = {"out", "in"};
473 int ep;
474 const char *t, *d;
475
476 if (!usbfs_snoop)
477 return;
478
479 ep = usb_pipeendpoint(pipe);
480 t = types[usb_pipetype(pipe)];
481 d = dirs[!!usb_pipein(pipe)];
482
483 if (userurb) { /* Async */
484 if (when == SUBMIT)
485 dev_info(&udev->dev, "userurb %pK, ep%d %s-%s, "
486 "length %u\n",
487 userurb, ep, t, d, length);
488 else
489 dev_info(&udev->dev, "userurb %pK, ep%d %s-%s, "
490 "actual_length %u status %d\n",
491 userurb, ep, t, d, length,
492 timeout_or_status);
493 } else {
494 if (when == SUBMIT)
495 dev_info(&udev->dev, "ep%d %s-%s, length %u, "
496 "timeout %d\n",
497 ep, t, d, length, timeout_or_status);
498 else
499 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
500 "status %d\n",
501 ep, t, d, length, timeout_or_status);
502 }
503
504 data_len = min(data_len, usbfs_snoop_max);
505 if (data && data_len > 0) {
506 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
507 data, data_len, 1);
508 }
509 }
510
511 static void snoop_urb_data(struct urb *urb, unsigned len)
512 {
513 int i, size;
514
515 len = min(len, usbfs_snoop_max);
516 if (!usbfs_snoop || len == 0)
517 return;
518
519 if (urb->num_sgs == 0) {
520 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
521 urb->transfer_buffer, len, 1);
522 return;
523 }
524
525 for (i = 0; i < urb->num_sgs && len; i++) {
526 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
527 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
528 sg_virt(&urb->sg[i]), size, 1);
529 len -= size;
530 }
531 }
532
533 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
534 {
535 unsigned i, len, size;
536
537 if (urb->number_of_packets > 0) /* Isochronous */
538 len = urb->transfer_buffer_length;
539 else /* Non-Isoc */
540 len = urb->actual_length;
541
542 if (urb->num_sgs == 0) {
543 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
544 return -EFAULT;
545 return 0;
546 }
547
548 for (i = 0; i < urb->num_sgs && len; i++) {
549 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
550 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
551 return -EFAULT;
552 userbuffer += size;
553 len -= size;
554 }
555
556 return 0;
557 }
558
559 #define AS_CONTINUATION 1
560 #define AS_UNLINK 2
561
562 static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
563 __releases(ps->lock)
564 __acquires(ps->lock)
565 {
566 struct urb *urb;
567 struct async *as;
568
569 /* Mark all the pending URBs that match bulk_addr, up to but not
570 * including the first one without AS_CONTINUATION. If such an
571 * URB is encountered then a new transfer has already started so
572 * the endpoint doesn't need to be disabled; otherwise it does.
573 */
574 list_for_each_entry(as, &ps->async_pending, asynclist) {
575 if (as->bulk_addr == bulk_addr) {
576 if (as->bulk_status != AS_CONTINUATION)
577 goto rescan;
578 as->bulk_status = AS_UNLINK;
579 as->bulk_addr = 0;
580 }
581 }
582 ps->disabled_bulk_eps |= (1 << bulk_addr);
583
584 /* Now carefully unlink all the marked pending URBs */
585 rescan:
586 list_for_each_entry_reverse(as, &ps->async_pending, asynclist) {
587 if (as->bulk_status == AS_UNLINK) {
588 as->bulk_status = 0; /* Only once */
589 urb = as->urb;
590 usb_get_urb(urb);
591 spin_unlock(&ps->lock); /* Allow completions */
592 usb_unlink_urb(urb);
593 usb_put_urb(urb);
594 spin_lock(&ps->lock);
595 goto rescan;
596 }
597 }
598 }
599
600 static void async_completed(struct urb *urb)
601 {
602 struct async *as = urb->context;
603 struct usb_dev_state *ps = as->ps;
604 struct pid *pid = NULL;
605 const struct cred *cred = NULL;
606 unsigned long flags;
607 sigval_t addr;
608 int signr, errno;
609
610 spin_lock_irqsave(&ps->lock, flags);
611 list_move_tail(&as->asynclist, &ps->async_completed);
612 as->status = urb->status;
613 signr = as->signr;
614 if (signr) {
615 errno = as->status;
616 addr = as->userurb_sigval;
617 pid = get_pid(as->pid);
618 cred = get_cred(as->cred);
619 }
620 snoop(&urb->dev->dev, "urb complete\n");
621 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
622 as->status, COMPLETE, NULL, 0);
623 if (usb_urb_dir_in(urb))
624 snoop_urb_data(urb, urb->actual_length);
625
626 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
627 as->status != -ENOENT)
628 cancel_bulk_urbs(ps, as->bulk_addr);
629
630 wake_up(&ps->wait);
631 spin_unlock_irqrestore(&ps->lock, flags);
632
633 if (signr) {
634 kill_pid_usb_asyncio(signr, errno, addr, pid, cred);
635 put_pid(pid);
636 put_cred(cred);
637 }
638 }
639
640 static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
641 {
642 struct urb *urb;
643 struct async *as;
644 unsigned long flags;
645
646 spin_lock_irqsave(&ps->lock, flags);
647 while (!list_empty(list)) {
648 as = list_last_entry(list, struct async, asynclist);
649 list_del_init(&as->asynclist);
650 urb = as->urb;
651 usb_get_urb(urb);
652
653 /* drop the spinlock so the completion handler can run */
654 spin_unlock_irqrestore(&ps->lock, flags);
655 usb_kill_urb(urb);
656 usb_put_urb(urb);
657 spin_lock_irqsave(&ps->lock, flags);
658 }
659 spin_unlock_irqrestore(&ps->lock, flags);
660 }
661
662 static void destroy_async_on_interface(struct usb_dev_state *ps,
663 unsigned int ifnum)
664 {
665 struct list_head *p, *q, hitlist;
666 unsigned long flags;
667
668 INIT_LIST_HEAD(&hitlist);
669 spin_lock_irqsave(&ps->lock, flags);
670 list_for_each_safe(p, q, &ps->async_pending)
671 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
672 list_move_tail(p, &hitlist);
673 spin_unlock_irqrestore(&ps->lock, flags);
674 destroy_async(ps, &hitlist);
675 }
676
677 static void destroy_all_async(struct usb_dev_state *ps)
678 {
679 destroy_async(ps, &ps->async_pending);
680 }
681
682 /*
683 * interface claims are made only at the request of user level code,
684 * which can also release them (explicitly or by closing files).
685 * they're also undone when devices disconnect.
686 */
687
688 static int driver_probe(struct usb_interface *intf,
689 const struct usb_device_id *id)
690 {
691 return -ENODEV;
692 }
693
694 static void driver_disconnect(struct usb_interface *intf)
695 {
696 struct usb_dev_state *ps = usb_get_intfdata(intf);
697 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
698
699 if (!ps)
700 return;
701
702 /* NOTE: this relies on usbcore having canceled and completed
703 * all pending I/O requests; 2.6 does that.
704 */
705
706 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
707 clear_bit(ifnum, &ps->ifclaimed);
708 else
709 dev_warn(&intf->dev, "interface number %u out of range\n",
710 ifnum);
711
712 usb_set_intfdata(intf, NULL);
713
714 /* force async requests to complete */
715 destroy_async_on_interface(ps, ifnum);
716 }
717
718 /* We don't care about suspend/resume of claimed interfaces */
719 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
720 {
721 return 0;
722 }
723
724 static int driver_resume(struct usb_interface *intf)
725 {
726 return 0;
727 }
728
729 /* The following routines apply to the entire device, not interfaces */
730 void usbfs_notify_suspend(struct usb_device *udev)
731 {
732 /* We don't need to handle this */
733 }
734
735 void usbfs_notify_resume(struct usb_device *udev)
736 {
737 struct usb_dev_state *ps;
738
739 /* Protect against simultaneous remove or release */
740 mutex_lock(&usbfs_mutex);
741 list_for_each_entry(ps, &udev->filelist, list) {
742 WRITE_ONCE(ps->not_yet_resumed, 0);
743 wake_up_all(&ps->wait_for_resume);
744 }
745 mutex_unlock(&usbfs_mutex);
746 }
747
748 struct usb_driver usbfs_driver = {
749 .name = "usbfs",
750 .probe = driver_probe,
751 .disconnect = driver_disconnect,
752 .suspend = driver_suspend,
753 .resume = driver_resume,
754 .supports_autosuspend = 1,
755 };
756
757 static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
758 {
759 struct usb_device *dev = ps->dev;
760 struct usb_interface *intf;
761 int err;
762
763 if (ifnum >= 8*sizeof(ps->ifclaimed))
764 return -EINVAL;
765 /* already claimed */
766 if (test_bit(ifnum, &ps->ifclaimed))
767 return 0;
768
769 if (ps->privileges_dropped &&
770 !test_bit(ifnum, &ps->interface_allowed_mask))
771 return -EACCES;
772
773 intf = usb_ifnum_to_if(dev, ifnum);
774 if (!intf)
775 err = -ENOENT;
776 else {
777 unsigned int old_suppress;
778
779 /* suppress uevents while claiming interface */
780 old_suppress = dev_get_uevent_suppress(&intf->dev);
781 dev_set_uevent_suppress(&intf->dev, 1);
782 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
783 dev_set_uevent_suppress(&intf->dev, old_suppress);
784 }
785 if (err == 0)
786 set_bit(ifnum, &ps->ifclaimed);
787 return err;
788 }
789
790 static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
791 {
792 struct usb_device *dev;
793 struct usb_interface *intf;
794 int err;
795
796 err = -EINVAL;
797 if (ifnum >= 8*sizeof(ps->ifclaimed))
798 return err;
799 dev = ps->dev;
800 intf = usb_ifnum_to_if(dev, ifnum);
801 if (!intf)
802 err = -ENOENT;
803 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
804 unsigned int old_suppress;
805
806 /* suppress uevents while releasing interface */
807 old_suppress = dev_get_uevent_suppress(&intf->dev);
808 dev_set_uevent_suppress(&intf->dev, 1);
809 usb_driver_release_interface(&usbfs_driver, intf);
810 dev_set_uevent_suppress(&intf->dev, old_suppress);
811 err = 0;
812 }
813 return err;
814 }
815
816 static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
817 {
818 if (ps->dev->state != USB_STATE_CONFIGURED)
819 return -EHOSTUNREACH;
820 if (ifnum >= 8*sizeof(ps->ifclaimed))
821 return -EINVAL;
822 if (test_bit(ifnum, &ps->ifclaimed))
823 return 0;
824 /* if not yet claimed, claim it for the driver */
825 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
826 "interface %u before use\n", task_pid_nr(current),
827 current->comm, ifnum);
828 return claimintf(ps, ifnum);
829 }
830
831 static int findintfep(struct usb_device *dev, unsigned int ep)
832 {
833 unsigned int i, j, e;
834 struct usb_interface *intf;
835 struct usb_host_interface *alts;
836 struct usb_endpoint_descriptor *endpt;
837
838 if (ep & ~(USB_DIR_IN|0xf))
839 return -EINVAL;
840 if (!dev->actconfig)
841 return -ESRCH;
842 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
843 intf = dev->actconfig->interface[i];
844 for (j = 0; j < intf->num_altsetting; j++) {
845 alts = &intf->altsetting[j];
846 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
847 endpt = &alts->endpoint[e].desc;
848 if (endpt->bEndpointAddress == ep)
849 return alts->desc.bInterfaceNumber;
850 }
851 }
852 }
853 return -ENOENT;
854 }
855
856 static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
857 unsigned int request, unsigned int index)
858 {
859 int ret = 0;
860 struct usb_host_interface *alt_setting;
861
862 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
863 && ps->dev->state != USB_STATE_ADDRESS
864 && ps->dev->state != USB_STATE_CONFIGURED)
865 return -EHOSTUNREACH;
866 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
867 return 0;
868
869 /*
870 * check for the special corner case 'get_device_id' in the printer
871 * class specification, which we always want to allow as it is used
872 * to query things like ink level, etc.
873 */
874 if (requesttype == 0xa1 && request == 0) {
875 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
876 index >> 8, index & 0xff);
877 if (alt_setting
878 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
879 return 0;
880 }
881
882 index &= 0xff;
883 switch (requesttype & USB_RECIP_MASK) {
884 case USB_RECIP_ENDPOINT:
885 if ((index & ~USB_DIR_IN) == 0)
886 return 0;
887 ret = findintfep(ps->dev, index);
888 if (ret < 0) {
889 /*
890 * Some not fully compliant Win apps seem to get
891 * index wrong and have the endpoint number here
892 * rather than the endpoint address (with the
893 * correct direction). Win does let this through,
894 * so we'll not reject it here but leave it to
895 * the device to not break KVM. But we warn.
896 */
897 ret = findintfep(ps->dev, index ^ 0x80);
898 if (ret >= 0)
899 dev_info(&ps->dev->dev,
900 "%s: process %i (%s) requesting ep %02x but needs %02x\n",
901 __func__, task_pid_nr(current),
902 current->comm, index, index ^ 0x80);
903 }
904 if (ret >= 0)
905 ret = checkintf(ps, ret);
906 break;
907
908 case USB_RECIP_INTERFACE:
909 ret = checkintf(ps, index);
910 break;
911 }
912 return ret;
913 }
914
915 static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
916 unsigned char ep)
917 {
918 if (ep & USB_ENDPOINT_DIR_MASK)
919 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
920 else
921 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
922 }
923
924 static int parse_usbdevfs_streams(struct usb_dev_state *ps,
925 struct usbdevfs_streams __user *streams,
926 unsigned int *num_streams_ret,
927 unsigned int *num_eps_ret,
928 struct usb_host_endpoint ***eps_ret,
929 struct usb_interface **intf_ret)
930 {
931 unsigned int i, num_streams, num_eps;
932 struct usb_host_endpoint **eps;
933 struct usb_interface *intf = NULL;
934 unsigned char ep;
935 int ifnum, ret;
936
937 if (get_user(num_streams, &streams->num_streams) ||
938 get_user(num_eps, &streams->num_eps))
939 return -EFAULT;
940
941 if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
942 return -EINVAL;
943
944 /* The XHCI controller allows max 2 ^ 16 streams */
945 if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
946 return -EINVAL;
947
948 eps = kmalloc_array(num_eps, sizeof(*eps), GFP_KERNEL);
949 if (!eps)
950 return -ENOMEM;
951
952 for (i = 0; i < num_eps; i++) {
953 if (get_user(ep, &streams->eps[i])) {
954 ret = -EFAULT;
955 goto error;
956 }
957 eps[i] = ep_to_host_endpoint(ps->dev, ep);
958 if (!eps[i]) {
959 ret = -EINVAL;
960 goto error;
961 }
962
963 /* usb_alloc/free_streams operate on an usb_interface */
964 ifnum = findintfep(ps->dev, ep);
965 if (ifnum < 0) {
966 ret = ifnum;
967 goto error;
968 }
969
970 if (i == 0) {
971 ret = checkintf(ps, ifnum);
972 if (ret < 0)
973 goto error;
974 intf = usb_ifnum_to_if(ps->dev, ifnum);
975 } else {
976 /* Verify all eps belong to the same interface */
977 if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
978 ret = -EINVAL;
979 goto error;
980 }
981 }
982 }
983
984 if (num_streams_ret)
985 *num_streams_ret = num_streams;
986 *num_eps_ret = num_eps;
987 *eps_ret = eps;
988 *intf_ret = intf;
989
990 return 0;
991
992 error:
993 kfree(eps);
994 return ret;
995 }
996
997 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
998 {
999 struct device *dev;
1000
1001 dev = bus_find_device_by_devt(&usb_bus_type, devt);
1002 if (!dev)
1003 return NULL;
1004 return to_usb_device(dev);
1005 }
1006
1007 /*
1008 * file operations
1009 */
1010 static int usbdev_open(struct inode *inode, struct file *file)
1011 {
1012 struct usb_device *dev = NULL;
1013 struct usb_dev_state *ps;
1014 int ret;
1015
1016 ret = -ENOMEM;
1017 ps = kzalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
1018 if (!ps)
1019 goto out_free_ps;
1020
1021 ret = -ENODEV;
1022
1023 /* usbdev device-node */
1024 if (imajor(inode) == USB_DEVICE_MAJOR)
1025 dev = usbdev_lookup_by_devt(inode->i_rdev);
1026 if (!dev)
1027 goto out_free_ps;
1028
1029 usb_lock_device(dev);
1030 if (dev->state == USB_STATE_NOTATTACHED)
1031 goto out_unlock_device;
1032
1033 ret = usb_autoresume_device(dev);
1034 if (ret)
1035 goto out_unlock_device;
1036
1037 ps->dev = dev;
1038 ps->file = file;
1039 ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
1040 spin_lock_init(&ps->lock);
1041 INIT_LIST_HEAD(&ps->list);
1042 INIT_LIST_HEAD(&ps->async_pending);
1043 INIT_LIST_HEAD(&ps->async_completed);
1044 INIT_LIST_HEAD(&ps->memory_list);
1045 init_waitqueue_head(&ps->wait);
1046 init_waitqueue_head(&ps->wait_for_resume);
1047 ps->disc_pid = get_pid(task_pid(current));
1048 ps->cred = get_current_cred();
1049 smp_wmb();
1050
1051 /* Can't race with resume; the device is already active */
1052 list_add_tail(&ps->list, &dev->filelist);
1053 file->private_data = ps;
1054 usb_unlock_device(dev);
1055 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
1056 current->comm);
1057 return ret;
1058
1059 out_unlock_device:
1060 usb_unlock_device(dev);
1061 usb_put_dev(dev);
1062 out_free_ps:
1063 kfree(ps);
1064 return ret;
1065 }
1066
1067 static int usbdev_release(struct inode *inode, struct file *file)
1068 {
1069 struct usb_dev_state *ps = file->private_data;
1070 struct usb_device *dev = ps->dev;
1071 unsigned int ifnum;
1072 struct async *as;
1073
1074 usb_lock_device(dev);
1075 usb_hub_release_all_ports(dev, ps);
1076
1077 /* Protect against simultaneous resume */
1078 mutex_lock(&usbfs_mutex);
1079 list_del_init(&ps->list);
1080 mutex_unlock(&usbfs_mutex);
1081
1082 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
1083 ifnum++) {
1084 if (test_bit(ifnum, &ps->ifclaimed))
1085 releaseintf(ps, ifnum);
1086 }
1087 destroy_all_async(ps);
1088 if (!ps->suspend_allowed)
1089 usb_autosuspend_device(dev);
1090 usb_unlock_device(dev);
1091 usb_put_dev(dev);
1092 put_pid(ps->disc_pid);
1093 put_cred(ps->cred);
1094
1095 as = async_getcompleted(ps);
1096 while (as) {
1097 free_async(as);
1098 as = async_getcompleted(ps);
1099 }
1100
1101 kfree(ps);
1102 return 0;
1103 }
1104
1105 static int proc_control(struct usb_dev_state *ps, void __user *arg)
1106 {
1107 struct usb_device *dev = ps->dev;
1108 struct usbdevfs_ctrltransfer ctrl;
1109 unsigned int tmo;
1110 unsigned char *tbuf;
1111 unsigned wLength;
1112 int i, pipe, ret;
1113
1114 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1115 return -EFAULT;
1116 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
1117 ctrl.wIndex);
1118 if (ret)
1119 return ret;
1120 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
1121 if (wLength > PAGE_SIZE)
1122 return -EINVAL;
1123 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1124 sizeof(struct usb_ctrlrequest));
1125 if (ret)
1126 return ret;
1127 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1128 if (!tbuf) {
1129 ret = -ENOMEM;
1130 goto done;
1131 }
1132 tmo = ctrl.timeout;
1133 snoop(&dev->dev, "control urb: bRequestType=%02x "
1134 "bRequest=%02x wValue=%04x "
1135 "wIndex=%04x wLength=%04x\n",
1136 ctrl.bRequestType, ctrl.bRequest, ctrl.wValue,
1137 ctrl.wIndex, ctrl.wLength);
1138 if (ctrl.bRequestType & 0x80) {
1139 if (ctrl.wLength && !access_ok(ctrl.data,
1140 ctrl.wLength)) {
1141 ret = -EINVAL;
1142 goto done;
1143 }
1144 pipe = usb_rcvctrlpipe(dev, 0);
1145 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
1146
1147 usb_unlock_device(dev);
1148 i = usb_control_msg(dev, pipe, ctrl.bRequest,
1149 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1150 tbuf, ctrl.wLength, tmo);
1151 usb_lock_device(dev);
1152 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
1153 tbuf, max(i, 0));
1154 if ((i > 0) && ctrl.wLength) {
1155 if (copy_to_user(ctrl.data, tbuf, i)) {
1156 ret = -EFAULT;
1157 goto done;
1158 }
1159 }
1160 } else {
1161 if (ctrl.wLength) {
1162 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
1163 ret = -EFAULT;
1164 goto done;
1165 }
1166 }
1167 pipe = usb_sndctrlpipe(dev, 0);
1168 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
1169 tbuf, ctrl.wLength);
1170
1171 usb_unlock_device(dev);
1172 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
1173 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1174 tbuf, ctrl.wLength, tmo);
1175 usb_lock_device(dev);
1176 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
1177 }
1178 if (i < 0 && i != -EPIPE) {
1179 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1180 "failed cmd %s rqt %u rq %u len %u ret %d\n",
1181 current->comm, ctrl.bRequestType, ctrl.bRequest,
1182 ctrl.wLength, i);
1183 }
1184 ret = i;
1185 done:
1186 free_page((unsigned long) tbuf);
1187 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1188 sizeof(struct usb_ctrlrequest));
1189 return ret;
1190 }
1191
1192 static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1193 {
1194 struct usb_device *dev = ps->dev;
1195 struct usbdevfs_bulktransfer bulk;
1196 unsigned int tmo, len1, pipe;
1197 int len2;
1198 unsigned char *tbuf;
1199 int i, ret;
1200
1201 if (copy_from_user(&bulk, arg, sizeof(bulk)))
1202 return -EFAULT;
1203 ret = findintfep(ps->dev, bulk.ep);
1204 if (ret < 0)
1205 return ret;
1206 ret = checkintf(ps, ret);
1207 if (ret)
1208 return ret;
1209 if (bulk.ep & USB_DIR_IN)
1210 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
1211 else
1212 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
1213 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
1214 return -EINVAL;
1215 len1 = bulk.len;
1216 if (len1 >= (INT_MAX - sizeof(struct urb)))
1217 return -EINVAL;
1218 ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1219 if (ret)
1220 return ret;
1221 tbuf = kmalloc(len1, GFP_KERNEL);
1222 if (!tbuf) {
1223 ret = -ENOMEM;
1224 goto done;
1225 }
1226 tmo = bulk.timeout;
1227 if (bulk.ep & 0x80) {
1228 if (len1 && !access_ok(bulk.data, len1)) {
1229 ret = -EINVAL;
1230 goto done;
1231 }
1232 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1233
1234 usb_unlock_device(dev);
1235 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1236 usb_lock_device(dev);
1237 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1238
1239 if (!i && len2) {
1240 if (copy_to_user(bulk.data, tbuf, len2)) {
1241 ret = -EFAULT;
1242 goto done;
1243 }
1244 }
1245 } else {
1246 if (len1) {
1247 if (copy_from_user(tbuf, bulk.data, len1)) {
1248 ret = -EFAULT;
1249 goto done;
1250 }
1251 }
1252 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1253
1254 usb_unlock_device(dev);
1255 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1256 usb_lock_device(dev);
1257 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1258 }
1259 ret = (i < 0 ? i : len2);
1260 done:
1261 kfree(tbuf);
1262 usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1263 return ret;
1264 }
1265
1266 static void check_reset_of_active_ep(struct usb_device *udev,
1267 unsigned int epnum, char *ioctl_name)
1268 {
1269 struct usb_host_endpoint **eps;
1270 struct usb_host_endpoint *ep;
1271
1272 eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1273 ep = eps[epnum & 0x0f];
1274 if (ep && !list_empty(&ep->urb_list))
1275 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1276 task_pid_nr(current), current->comm,
1277 ioctl_name, epnum);
1278 }
1279
1280 static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1281 {
1282 unsigned int ep;
1283 int ret;
1284
1285 if (get_user(ep, (unsigned int __user *)arg))
1286 return -EFAULT;
1287 ret = findintfep(ps->dev, ep);
1288 if (ret < 0)
1289 return ret;
1290 ret = checkintf(ps, ret);
1291 if (ret)
1292 return ret;
1293 check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1294 usb_reset_endpoint(ps->dev, ep);
1295 return 0;
1296 }
1297
1298 static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1299 {
1300 unsigned int ep;
1301 int pipe;
1302 int ret;
1303
1304 if (get_user(ep, (unsigned int __user *)arg))
1305 return -EFAULT;
1306 ret = findintfep(ps->dev, ep);
1307 if (ret < 0)
1308 return ret;
1309 ret = checkintf(ps, ret);
1310 if (ret)
1311 return ret;
1312 check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1313 if (ep & USB_DIR_IN)
1314 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1315 else
1316 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1317
1318 return usb_clear_halt(ps->dev, pipe);
1319 }
1320
1321 static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1322 {
1323 struct usbdevfs_getdriver gd;
1324 struct usb_interface *intf;
1325 int ret;
1326
1327 if (copy_from_user(&gd, arg, sizeof(gd)))
1328 return -EFAULT;
1329 intf = usb_ifnum_to_if(ps->dev, gd.interface);
1330 if (!intf || !intf->dev.driver)
1331 ret = -ENODATA;
1332 else {
1333 strlcpy(gd.driver, intf->dev.driver->name,
1334 sizeof(gd.driver));
1335 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1336 }
1337 return ret;
1338 }
1339
1340 static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1341 {
1342 struct usbdevfs_connectinfo ci;
1343
1344 memset(&ci, 0, sizeof(ci));
1345 ci.devnum = ps->dev->devnum;
1346 ci.slow = ps->dev->speed == USB_SPEED_LOW;
1347
1348 if (copy_to_user(arg, &ci, sizeof(ci)))
1349 return -EFAULT;
1350 return 0;
1351 }
1352
1353 static int proc_conninfo_ex(struct usb_dev_state *ps,
1354 void __user *arg, size_t size)
1355 {
1356 struct usbdevfs_conninfo_ex ci;
1357 struct usb_device *udev = ps->dev;
1358
1359 if (size < sizeof(ci.size))
1360 return -EINVAL;
1361
1362 memset(&ci, 0, sizeof(ci));
1363 ci.size = sizeof(ci);
1364 ci.busnum = udev->bus->busnum;
1365 ci.devnum = udev->devnum;
1366 ci.speed = udev->speed;
1367
1368 while (udev && udev->portnum != 0) {
1369 if (++ci.num_ports <= ARRAY_SIZE(ci.ports))
1370 ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports] =
1371 udev->portnum;
1372 udev = udev->parent;
1373 }
1374
1375 if (ci.num_ports < ARRAY_SIZE(ci.ports))
1376 memmove(&ci.ports[0],
1377 &ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports],
1378 ci.num_ports);
1379
1380 if (copy_to_user(arg, &ci, min(sizeof(ci), size)))
1381 return -EFAULT;
1382
1383 return 0;
1384 }
1385
1386 static int proc_resetdevice(struct usb_dev_state *ps)
1387 {
1388 struct usb_host_config *actconfig = ps->dev->actconfig;
1389 struct usb_interface *interface;
1390 int i, number;
1391
1392 /* Don't allow a device reset if the process has dropped the
1393 * privilege to do such things and any of the interfaces are
1394 * currently claimed.
1395 */
1396 if (ps->privileges_dropped && actconfig) {
1397 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1398 interface = actconfig->interface[i];
1399 number = interface->cur_altsetting->desc.bInterfaceNumber;
1400 if (usb_interface_claimed(interface) &&
1401 !test_bit(number, &ps->ifclaimed)) {
1402 dev_warn(&ps->dev->dev,
1403 "usbfs: interface %d claimed by %s while '%s' resets device\n",
1404 number, interface->dev.driver->name, current->comm);
1405 return -EACCES;
1406 }
1407 }
1408 }
1409
1410 return usb_reset_device(ps->dev);
1411 }
1412
1413 static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1414 {
1415 struct usbdevfs_setinterface setintf;
1416 int ret;
1417
1418 if (copy_from_user(&setintf, arg, sizeof(setintf)))
1419 return -EFAULT;
1420 ret = checkintf(ps, setintf.interface);
1421 if (ret)
1422 return ret;
1423
1424 destroy_async_on_interface(ps, setintf.interface);
1425
1426 return usb_set_interface(ps->dev, setintf.interface,
1427 setintf.altsetting);
1428 }
1429
1430 static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1431 {
1432 int u;
1433 int status = 0;
1434 struct usb_host_config *actconfig;
1435
1436 if (get_user(u, (int __user *)arg))
1437 return -EFAULT;
1438
1439 actconfig = ps->dev->actconfig;
1440
1441 /* Don't touch the device if any interfaces are claimed.
1442 * It could interfere with other drivers' operations, and if
1443 * an interface is claimed by usbfs it could easily deadlock.
1444 */
1445 if (actconfig) {
1446 int i;
1447
1448 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1449 if (usb_interface_claimed(actconfig->interface[i])) {
1450 dev_warn(&ps->dev->dev,
1451 "usbfs: interface %d claimed by %s "
1452 "while '%s' sets config #%d\n",
1453 actconfig->interface[i]
1454 ->cur_altsetting
1455 ->desc.bInterfaceNumber,
1456 actconfig->interface[i]
1457 ->dev.driver->name,
1458 current->comm, u);
1459 status = -EBUSY;
1460 break;
1461 }
1462 }
1463 }
1464
1465 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1466 * so avoid usb_set_configuration()'s kick to sysfs
1467 */
1468 if (status == 0) {
1469 if (actconfig && actconfig->desc.bConfigurationValue == u)
1470 status = usb_reset_configuration(ps->dev);
1471 else
1472 status = usb_set_configuration(ps->dev, u);
1473 }
1474
1475 return status;
1476 }
1477
1478 static struct usb_memory *
1479 find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
1480 {
1481 struct usb_memory *usbm = NULL, *iter;
1482 unsigned long flags;
1483 unsigned long uurb_start = (unsigned long)uurb->buffer;
1484
1485 spin_lock_irqsave(&ps->lock, flags);
1486 list_for_each_entry(iter, &ps->memory_list, memlist) {
1487 if (uurb_start >= iter->vm_start &&
1488 uurb_start < iter->vm_start + iter->size) {
1489 if (uurb->buffer_length > iter->vm_start + iter->size -
1490 uurb_start) {
1491 usbm = ERR_PTR(-EINVAL);
1492 } else {
1493 usbm = iter;
1494 usbm->urb_use_count++;
1495 }
1496 break;
1497 }
1498 }
1499 spin_unlock_irqrestore(&ps->lock, flags);
1500 return usbm;
1501 }
1502
1503 static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1504 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1505 void __user *arg, sigval_t userurb_sigval)
1506 {
1507 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1508 struct usb_host_endpoint *ep;
1509 struct async *as = NULL;
1510 struct usb_ctrlrequest *dr = NULL;
1511 unsigned int u, totlen, isofrmlen;
1512 int i, ret, num_sgs = 0, ifnum = -1;
1513 int number_of_packets = 0;
1514 unsigned int stream_id = 0;
1515 void *buf;
1516 bool is_in;
1517 bool allow_short = false;
1518 bool allow_zero = false;
1519 unsigned long mask = USBDEVFS_URB_SHORT_NOT_OK |
1520 USBDEVFS_URB_BULK_CONTINUATION |
1521 USBDEVFS_URB_NO_FSBR |
1522 USBDEVFS_URB_ZERO_PACKET |
1523 USBDEVFS_URB_NO_INTERRUPT;
1524 /* USBDEVFS_URB_ISO_ASAP is a special case */
1525 if (uurb->type == USBDEVFS_URB_TYPE_ISO)
1526 mask |= USBDEVFS_URB_ISO_ASAP;
1527
1528 if (uurb->flags & ~mask)
1529 return -EINVAL;
1530
1531 if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
1532 return -EINVAL;
1533 if (uurb->buffer_length > 0 && !uurb->buffer)
1534 return -EINVAL;
1535 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1536 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1537 ifnum = findintfep(ps->dev, uurb->endpoint);
1538 if (ifnum < 0)
1539 return ifnum;
1540 ret = checkintf(ps, ifnum);
1541 if (ret)
1542 return ret;
1543 }
1544 ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1545 if (!ep)
1546 return -ENOENT;
1547 is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1548
1549 u = 0;
1550 switch (uurb->type) {
1551 case USBDEVFS_URB_TYPE_CONTROL:
1552 if (!usb_endpoint_xfer_control(&ep->desc))
1553 return -EINVAL;
1554 /* min 8 byte setup packet */
1555 if (uurb->buffer_length < 8)
1556 return -EINVAL;
1557 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1558 if (!dr)
1559 return -ENOMEM;
1560 if (copy_from_user(dr, uurb->buffer, 8)) {
1561 ret = -EFAULT;
1562 goto error;
1563 }
1564 if (uurb->buffer_length < (le16_to_cpu(dr->wLength) + 8)) {
1565 ret = -EINVAL;
1566 goto error;
1567 }
1568 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1569 le16_to_cpu(dr->wIndex));
1570 if (ret)
1571 goto error;
1572 uurb->buffer_length = le16_to_cpu(dr->wLength);
1573 uurb->buffer += 8;
1574 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1575 is_in = true;
1576 uurb->endpoint |= USB_DIR_IN;
1577 } else {
1578 is_in = false;
1579 uurb->endpoint &= ~USB_DIR_IN;
1580 }
1581 if (is_in)
1582 allow_short = true;
1583 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1584 "bRequest=%02x wValue=%04x "
1585 "wIndex=%04x wLength=%04x\n",
1586 dr->bRequestType, dr->bRequest,
1587 __le16_to_cpu(dr->wValue),
1588 __le16_to_cpu(dr->wIndex),
1589 __le16_to_cpu(dr->wLength));
1590 u = sizeof(struct usb_ctrlrequest);
1591 break;
1592
1593 case USBDEVFS_URB_TYPE_BULK:
1594 if (!is_in)
1595 allow_zero = true;
1596 else
1597 allow_short = true;
1598 switch (usb_endpoint_type(&ep->desc)) {
1599 case USB_ENDPOINT_XFER_CONTROL:
1600 case USB_ENDPOINT_XFER_ISOC:
1601 return -EINVAL;
1602 case USB_ENDPOINT_XFER_INT:
1603 /* allow single-shot interrupt transfers */
1604 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1605 goto interrupt_urb;
1606 }
1607 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1608 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1609 num_sgs = 0;
1610 if (ep->streams)
1611 stream_id = uurb->stream_id;
1612 break;
1613
1614 case USBDEVFS_URB_TYPE_INTERRUPT:
1615 if (!usb_endpoint_xfer_int(&ep->desc))
1616 return -EINVAL;
1617 interrupt_urb:
1618 if (!is_in)
1619 allow_zero = true;
1620 else
1621 allow_short = true;
1622 break;
1623
1624 case USBDEVFS_URB_TYPE_ISO:
1625 /* arbitrary limit */
1626 if (uurb->number_of_packets < 1 ||
1627 uurb->number_of_packets > 128)
1628 return -EINVAL;
1629 if (!usb_endpoint_xfer_isoc(&ep->desc))
1630 return -EINVAL;
1631 number_of_packets = uurb->number_of_packets;
1632 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1633 number_of_packets;
1634 isopkt = memdup_user(iso_frame_desc, isofrmlen);
1635 if (IS_ERR(isopkt)) {
1636 ret = PTR_ERR(isopkt);
1637 isopkt = NULL;
1638 goto error;
1639 }
1640 for (totlen = u = 0; u < number_of_packets; u++) {
1641 /*
1642 * arbitrary limit need for USB 3.1 Gen2
1643 * sizemax: 96 DPs at SSP, 96 * 1024 = 98304
1644 */
1645 if (isopkt[u].length > 98304) {
1646 ret = -EINVAL;
1647 goto error;
1648 }
1649 totlen += isopkt[u].length;
1650 }
1651 u *= sizeof(struct usb_iso_packet_descriptor);
1652 uurb->buffer_length = totlen;
1653 break;
1654
1655 default:
1656 return -EINVAL;
1657 }
1658
1659 if (uurb->buffer_length > 0 &&
1660 !access_ok(uurb->buffer, uurb->buffer_length)) {
1661 ret = -EFAULT;
1662 goto error;
1663 }
1664 as = alloc_async(number_of_packets);
1665 if (!as) {
1666 ret = -ENOMEM;
1667 goto error;
1668 }
1669
1670 as->usbm = find_memory_area(ps, uurb);
1671 if (IS_ERR(as->usbm)) {
1672 ret = PTR_ERR(as->usbm);
1673 as->usbm = NULL;
1674 goto error;
1675 }
1676
1677 /* do not use SG buffers when memory mapped segments
1678 * are in use
1679 */
1680 if (as->usbm)
1681 num_sgs = 0;
1682
1683 u += sizeof(struct async) + sizeof(struct urb) +
1684 (as->usbm ? 0 : uurb->buffer_length) +
1685 num_sgs * sizeof(struct scatterlist);
1686 ret = usbfs_increase_memory_usage(u);
1687 if (ret)
1688 goto error;
1689 as->mem_usage = u;
1690
1691 if (num_sgs) {
1692 as->urb->sg = kmalloc_array(num_sgs,
1693 sizeof(struct scatterlist),
1694 GFP_KERNEL);
1695 if (!as->urb->sg) {
1696 ret = -ENOMEM;
1697 goto error;
1698 }
1699 as->urb->num_sgs = num_sgs;
1700 sg_init_table(as->urb->sg, as->urb->num_sgs);
1701
1702 totlen = uurb->buffer_length;
1703 for (i = 0; i < as->urb->num_sgs; i++) {
1704 u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1705 buf = kmalloc(u, GFP_KERNEL);
1706 if (!buf) {
1707 ret = -ENOMEM;
1708 goto error;
1709 }
1710 sg_set_buf(&as->urb->sg[i], buf, u);
1711
1712 if (!is_in) {
1713 if (copy_from_user(buf, uurb->buffer, u)) {
1714 ret = -EFAULT;
1715 goto error;
1716 }
1717 uurb->buffer += u;
1718 }
1719 totlen -= u;
1720 }
1721 } else if (uurb->buffer_length > 0) {
1722 if (as->usbm) {
1723 unsigned long uurb_start = (unsigned long)uurb->buffer;
1724
1725 as->urb->transfer_buffer = as->usbm->mem +
1726 (uurb_start - as->usbm->vm_start);
1727 } else {
1728 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1729 GFP_KERNEL);
1730 if (!as->urb->transfer_buffer) {
1731 ret = -ENOMEM;
1732 goto error;
1733 }
1734 if (!is_in) {
1735 if (copy_from_user(as->urb->transfer_buffer,
1736 uurb->buffer,
1737 uurb->buffer_length)) {
1738 ret = -EFAULT;
1739 goto error;
1740 }
1741 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1742 /*
1743 * Isochronous input data may end up being
1744 * discontiguous if some of the packets are
1745 * short. Clear the buffer so that the gaps
1746 * don't leak kernel data to userspace.
1747 */
1748 memset(as->urb->transfer_buffer, 0,
1749 uurb->buffer_length);
1750 }
1751 }
1752 }
1753 as->urb->dev = ps->dev;
1754 as->urb->pipe = (uurb->type << 30) |
1755 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1756 (uurb->endpoint & USB_DIR_IN);
1757
1758 /* This tedious sequence is necessary because the URB_* flags
1759 * are internal to the kernel and subject to change, whereas
1760 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1761 */
1762 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1763 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1764 u |= URB_ISO_ASAP;
1765 if (allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1766 u |= URB_SHORT_NOT_OK;
1767 if (allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1768 u |= URB_ZERO_PACKET;
1769 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1770 u |= URB_NO_INTERRUPT;
1771 as->urb->transfer_flags = u;
1772
1773 if (!allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1774 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_SHORT_NOT_OK.\n");
1775 if (!allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1776 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_ZERO_PACKET.\n");
1777
1778 as->urb->transfer_buffer_length = uurb->buffer_length;
1779 as->urb->setup_packet = (unsigned char *)dr;
1780 dr = NULL;
1781 as->urb->start_frame = uurb->start_frame;
1782 as->urb->number_of_packets = number_of_packets;
1783 as->urb->stream_id = stream_id;
1784
1785 if (ep->desc.bInterval) {
1786 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1787 ps->dev->speed == USB_SPEED_HIGH ||
1788 ps->dev->speed >= USB_SPEED_SUPER)
1789 as->urb->interval = 1 <<
1790 min(15, ep->desc.bInterval - 1);
1791 else
1792 as->urb->interval = ep->desc.bInterval;
1793 }
1794
1795 as->urb->context = as;
1796 as->urb->complete = async_completed;
1797 for (totlen = u = 0; u < number_of_packets; u++) {
1798 as->urb->iso_frame_desc[u].offset = totlen;
1799 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1800 totlen += isopkt[u].length;
1801 }
1802 kfree(isopkt);
1803 isopkt = NULL;
1804 as->ps = ps;
1805 as->userurb = arg;
1806 as->userurb_sigval = userurb_sigval;
1807 if (as->usbm) {
1808 unsigned long uurb_start = (unsigned long)uurb->buffer;
1809
1810 as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1811 as->urb->transfer_dma = as->usbm->dma_handle +
1812 (uurb_start - as->usbm->vm_start);
1813 } else if (is_in && uurb->buffer_length > 0)
1814 as->userbuffer = uurb->buffer;
1815 as->signr = uurb->signr;
1816 as->ifnum = ifnum;
1817 as->pid = get_pid(task_pid(current));
1818 as->cred = get_current_cred();
1819 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1820 as->urb->transfer_buffer_length, 0, SUBMIT,
1821 NULL, 0);
1822 if (!is_in)
1823 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1824
1825 async_newpending(as);
1826
1827 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1828 spin_lock_irq(&ps->lock);
1829
1830 /* Not exactly the endpoint address; the direction bit is
1831 * shifted to the 0x10 position so that the value will be
1832 * between 0 and 31.
1833 */
1834 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1835 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1836 >> 3);
1837
1838 /* If this bulk URB is the start of a new transfer, re-enable
1839 * the endpoint. Otherwise mark it as a continuation URB.
1840 */
1841 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1842 as->bulk_status = AS_CONTINUATION;
1843 else
1844 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1845
1846 /* Don't accept continuation URBs if the endpoint is
1847 * disabled because of an earlier error.
1848 */
1849 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1850 ret = -EREMOTEIO;
1851 else
1852 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1853 spin_unlock_irq(&ps->lock);
1854 } else {
1855 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1856 }
1857
1858 if (ret) {
1859 dev_printk(KERN_DEBUG, &ps->dev->dev,
1860 "usbfs: usb_submit_urb returned %d\n", ret);
1861 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1862 0, ret, COMPLETE, NULL, 0);
1863 async_removepending(as);
1864 goto error;
1865 }
1866 return 0;
1867
1868 error:
1869 kfree(isopkt);
1870 kfree(dr);
1871 if (as)
1872 free_async(as);
1873 return ret;
1874 }
1875
1876 static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1877 {
1878 struct usbdevfs_urb uurb;
1879 sigval_t userurb_sigval;
1880
1881 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1882 return -EFAULT;
1883
1884 memset(&userurb_sigval, 0, sizeof(userurb_sigval));
1885 userurb_sigval.sival_ptr = arg;
1886
1887 return proc_do_submiturb(ps, &uurb,
1888 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1889 arg, userurb_sigval);
1890 }
1891
1892 static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1893 {
1894 struct urb *urb;
1895 struct async *as;
1896 unsigned long flags;
1897
1898 spin_lock_irqsave(&ps->lock, flags);
1899 as = async_getpending(ps, arg);
1900 if (!as) {
1901 spin_unlock_irqrestore(&ps->lock, flags);
1902 return -EINVAL;
1903 }
1904
1905 urb = as->urb;
1906 usb_get_urb(urb);
1907 spin_unlock_irqrestore(&ps->lock, flags);
1908
1909 usb_kill_urb(urb);
1910 usb_put_urb(urb);
1911
1912 return 0;
1913 }
1914
1915 static void compute_isochronous_actual_length(struct urb *urb)
1916 {
1917 unsigned int i;
1918
1919 if (urb->number_of_packets > 0) {
1920 urb->actual_length = 0;
1921 for (i = 0; i < urb->number_of_packets; i++)
1922 urb->actual_length +=
1923 urb->iso_frame_desc[i].actual_length;
1924 }
1925 }
1926
1927 static int processcompl(struct async *as, void __user * __user *arg)
1928 {
1929 struct urb *urb = as->urb;
1930 struct usbdevfs_urb __user *userurb = as->userurb;
1931 void __user *addr = as->userurb;
1932 unsigned int i;
1933
1934 compute_isochronous_actual_length(urb);
1935 if (as->userbuffer && urb->actual_length) {
1936 if (copy_urb_data_to_user(as->userbuffer, urb))
1937 goto err_out;
1938 }
1939 if (put_user(as->status, &userurb->status))
1940 goto err_out;
1941 if (put_user(urb->actual_length, &userurb->actual_length))
1942 goto err_out;
1943 if (put_user(urb->error_count, &userurb->error_count))
1944 goto err_out;
1945
1946 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1947 for (i = 0; i < urb->number_of_packets; i++) {
1948 if (put_user(urb->iso_frame_desc[i].actual_length,
1949 &userurb->iso_frame_desc[i].actual_length))
1950 goto err_out;
1951 if (put_user(urb->iso_frame_desc[i].status,
1952 &userurb->iso_frame_desc[i].status))
1953 goto err_out;
1954 }
1955 }
1956
1957 if (put_user(addr, (void __user * __user *)arg))
1958 return -EFAULT;
1959 return 0;
1960
1961 err_out:
1962 return -EFAULT;
1963 }
1964
1965 static struct async *reap_as(struct usb_dev_state *ps)
1966 {
1967 DECLARE_WAITQUEUE(wait, current);
1968 struct async *as = NULL;
1969 struct usb_device *dev = ps->dev;
1970
1971 add_wait_queue(&ps->wait, &wait);
1972 for (;;) {
1973 __set_current_state(TASK_INTERRUPTIBLE);
1974 as = async_getcompleted(ps);
1975 if (as || !connected(ps))
1976 break;
1977 if (signal_pending(current))
1978 break;
1979 usb_unlock_device(dev);
1980 schedule();
1981 usb_lock_device(dev);
1982 }
1983 remove_wait_queue(&ps->wait, &wait);
1984 set_current_state(TASK_RUNNING);
1985 return as;
1986 }
1987
1988 static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
1989 {
1990 struct async *as = reap_as(ps);
1991
1992 if (as) {
1993 int retval;
1994
1995 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
1996 retval = processcompl(as, (void __user * __user *)arg);
1997 free_async(as);
1998 return retval;
1999 }
2000 if (signal_pending(current))
2001 return -EINTR;
2002 return -ENODEV;
2003 }
2004
2005 static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
2006 {
2007 int retval;
2008 struct async *as;
2009
2010 as = async_getcompleted(ps);
2011 if (as) {
2012 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
2013 retval = processcompl(as, (void __user * __user *)arg);
2014 free_async(as);
2015 } else {
2016 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2017 }
2018 return retval;
2019 }
2020
2021 #ifdef CONFIG_COMPAT
2022 static int proc_control_compat(struct usb_dev_state *ps,
2023 struct usbdevfs_ctrltransfer32 __user *p32)
2024 {
2025 struct usbdevfs_ctrltransfer __user *p;
2026 __u32 udata;
2027 p = compat_alloc_user_space(sizeof(*p));
2028 if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
2029 get_user(udata, &p32->data) ||
2030 put_user(compat_ptr(udata), &p->data))
2031 return -EFAULT;
2032 return proc_control(ps, p);
2033 }
2034
2035 static int proc_bulk_compat(struct usb_dev_state *ps,
2036 struct usbdevfs_bulktransfer32 __user *p32)
2037 {
2038 struct usbdevfs_bulktransfer __user *p;
2039 compat_uint_t n;
2040 compat_caddr_t addr;
2041
2042 p = compat_alloc_user_space(sizeof(*p));
2043
2044 if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
2045 get_user(n, &p32->len) || put_user(n, &p->len) ||
2046 get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
2047 get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
2048 return -EFAULT;
2049
2050 return proc_bulk(ps, p);
2051 }
2052 static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
2053 {
2054 struct usbdevfs_disconnectsignal32 ds;
2055
2056 if (copy_from_user(&ds, arg, sizeof(ds)))
2057 return -EFAULT;
2058 ps->discsignr = ds.signr;
2059 ps->disccontext.sival_int = ds.context;
2060 return 0;
2061 }
2062
2063 static int get_urb32(struct usbdevfs_urb *kurb,
2064 struct usbdevfs_urb32 __user *uurb)
2065 {
2066 struct usbdevfs_urb32 urb32;
2067 if (copy_from_user(&urb32, uurb, sizeof(*uurb)))
2068 return -EFAULT;
2069 kurb->type = urb32.type;
2070 kurb->endpoint = urb32.endpoint;
2071 kurb->status = urb32.status;
2072 kurb->flags = urb32.flags;
2073 kurb->buffer = compat_ptr(urb32.buffer);
2074 kurb->buffer_length = urb32.buffer_length;
2075 kurb->actual_length = urb32.actual_length;
2076 kurb->start_frame = urb32.start_frame;
2077 kurb->number_of_packets = urb32.number_of_packets;
2078 kurb->error_count = urb32.error_count;
2079 kurb->signr = urb32.signr;
2080 kurb->usercontext = compat_ptr(urb32.usercontext);
2081 return 0;
2082 }
2083
2084 static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
2085 {
2086 struct usbdevfs_urb uurb;
2087 sigval_t userurb_sigval;
2088
2089 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
2090 return -EFAULT;
2091
2092 memset(&userurb_sigval, 0, sizeof(userurb_sigval));
2093 userurb_sigval.sival_int = ptr_to_compat(arg);
2094
2095 return proc_do_submiturb(ps, &uurb,
2096 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
2097 arg, userurb_sigval);
2098 }
2099
2100 static int processcompl_compat(struct async *as, void __user * __user *arg)
2101 {
2102 struct urb *urb = as->urb;
2103 struct usbdevfs_urb32 __user *userurb = as->userurb;
2104 void __user *addr = as->userurb;
2105 unsigned int i;
2106
2107 compute_isochronous_actual_length(urb);
2108 if (as->userbuffer && urb->actual_length) {
2109 if (copy_urb_data_to_user(as->userbuffer, urb))
2110 return -EFAULT;
2111 }
2112 if (put_user(as->status, &userurb->status))
2113 return -EFAULT;
2114 if (put_user(urb->actual_length, &userurb->actual_length))
2115 return -EFAULT;
2116 if (put_user(urb->error_count, &userurb->error_count))
2117 return -EFAULT;
2118
2119 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2120 for (i = 0; i < urb->number_of_packets; i++) {
2121 if (put_user(urb->iso_frame_desc[i].actual_length,
2122 &userurb->iso_frame_desc[i].actual_length))
2123 return -EFAULT;
2124 if (put_user(urb->iso_frame_desc[i].status,
2125 &userurb->iso_frame_desc[i].status))
2126 return -EFAULT;
2127 }
2128 }
2129
2130 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2131 return -EFAULT;
2132 return 0;
2133 }
2134
2135 static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
2136 {
2137 struct async *as = reap_as(ps);
2138
2139 if (as) {
2140 int retval;
2141
2142 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
2143 retval = processcompl_compat(as, (void __user * __user *)arg);
2144 free_async(as);
2145 return retval;
2146 }
2147 if (signal_pending(current))
2148 return -EINTR;
2149 return -ENODEV;
2150 }
2151
2152 static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
2153 {
2154 int retval;
2155 struct async *as;
2156
2157 as = async_getcompleted(ps);
2158 if (as) {
2159 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
2160 retval = processcompl_compat(as, (void __user * __user *)arg);
2161 free_async(as);
2162 } else {
2163 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2164 }
2165 return retval;
2166 }
2167
2168
2169 #endif
2170
2171 static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
2172 {
2173 struct usbdevfs_disconnectsignal ds;
2174
2175 if (copy_from_user(&ds, arg, sizeof(ds)))
2176 return -EFAULT;
2177 ps->discsignr = ds.signr;
2178 ps->disccontext.sival_ptr = ds.context;
2179 return 0;
2180 }
2181
2182 static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
2183 {
2184 unsigned int ifnum;
2185
2186 if (get_user(ifnum, (unsigned int __user *)arg))
2187 return -EFAULT;
2188 return claimintf(ps, ifnum);
2189 }
2190
2191 static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
2192 {
2193 unsigned int ifnum;
2194 int ret;
2195
2196 if (get_user(ifnum, (unsigned int __user *)arg))
2197 return -EFAULT;
2198 ret = releaseintf(ps, ifnum);
2199 if (ret < 0)
2200 return ret;
2201 destroy_async_on_interface(ps, ifnum);
2202 return 0;
2203 }
2204
2205 static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
2206 {
2207 int size;
2208 void *buf = NULL;
2209 int retval = 0;
2210 struct usb_interface *intf = NULL;
2211 struct usb_driver *driver = NULL;
2212
2213 if (ps->privileges_dropped)
2214 return -EACCES;
2215
2216 if (!connected(ps))
2217 return -ENODEV;
2218
2219 /* alloc buffer */
2220 size = _IOC_SIZE(ctl->ioctl_code);
2221 if (size > 0) {
2222 buf = kmalloc(size, GFP_KERNEL);
2223 if (buf == NULL)
2224 return -ENOMEM;
2225 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2226 if (copy_from_user(buf, ctl->data, size)) {
2227 kfree(buf);
2228 return -EFAULT;
2229 }
2230 } else {
2231 memset(buf, 0, size);
2232 }
2233 }
2234
2235 if (ps->dev->state != USB_STATE_CONFIGURED)
2236 retval = -EHOSTUNREACH;
2237 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
2238 retval = -EINVAL;
2239 else switch (ctl->ioctl_code) {
2240
2241 /* disconnect kernel driver from interface */
2242 case USBDEVFS_DISCONNECT:
2243 if (intf->dev.driver) {
2244 driver = to_usb_driver(intf->dev.driver);
2245 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2246 usb_driver_release_interface(driver, intf);
2247 } else
2248 retval = -ENODATA;
2249 break;
2250
2251 /* let kernel drivers try to (re)bind to the interface */
2252 case USBDEVFS_CONNECT:
2253 if (!intf->dev.driver)
2254 retval = device_attach(&intf->dev);
2255 else
2256 retval = -EBUSY;
2257 break;
2258
2259 /* talk directly to the interface's driver */
2260 default:
2261 if (intf->dev.driver)
2262 driver = to_usb_driver(intf->dev.driver);
2263 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2264 retval = -ENOTTY;
2265 } else {
2266 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2267 if (retval == -ENOIOCTLCMD)
2268 retval = -ENOTTY;
2269 }
2270 }
2271
2272 /* cleanup and return */
2273 if (retval >= 0
2274 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2275 && size > 0
2276 && copy_to_user(ctl->data, buf, size) != 0)
2277 retval = -EFAULT;
2278
2279 kfree(buf);
2280 return retval;
2281 }
2282
2283 static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2284 {
2285 struct usbdevfs_ioctl ctrl;
2286
2287 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2288 return -EFAULT;
2289 return proc_ioctl(ps, &ctrl);
2290 }
2291
2292 #ifdef CONFIG_COMPAT
2293 static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2294 {
2295 struct usbdevfs_ioctl32 ioc32;
2296 struct usbdevfs_ioctl ctrl;
2297
2298 if (copy_from_user(&ioc32, compat_ptr(arg), sizeof(ioc32)))
2299 return -EFAULT;
2300 ctrl.ifno = ioc32.ifno;
2301 ctrl.ioctl_code = ioc32.ioctl_code;
2302 ctrl.data = compat_ptr(ioc32.data);
2303 return proc_ioctl(ps, &ctrl);
2304 }
2305 #endif
2306
2307 static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2308 {
2309 unsigned portnum;
2310 int rc;
2311
2312 if (get_user(portnum, (unsigned __user *) arg))
2313 return -EFAULT;
2314 rc = usb_hub_claim_port(ps->dev, portnum, ps);
2315 if (rc == 0)
2316 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2317 portnum, task_pid_nr(current), current->comm);
2318 return rc;
2319 }
2320
2321 static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2322 {
2323 unsigned portnum;
2324
2325 if (get_user(portnum, (unsigned __user *) arg))
2326 return -EFAULT;
2327 return usb_hub_release_port(ps->dev, portnum, ps);
2328 }
2329
2330 static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2331 {
2332 __u32 caps;
2333
2334 caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2335 USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
2336 USBDEVFS_CAP_DROP_PRIVILEGES |
2337 USBDEVFS_CAP_CONNINFO_EX | MAYBE_CAP_SUSPEND;
2338 if (!ps->dev->bus->no_stop_on_short)
2339 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2340 if (ps->dev->bus->sg_tablesize)
2341 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2342
2343 if (put_user(caps, (__u32 __user *)arg))
2344 return -EFAULT;
2345
2346 return 0;
2347 }
2348
2349 static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2350 {
2351 struct usbdevfs_disconnect_claim dc;
2352 struct usb_interface *intf;
2353
2354 if (copy_from_user(&dc, arg, sizeof(dc)))
2355 return -EFAULT;
2356
2357 intf = usb_ifnum_to_if(ps->dev, dc.interface);
2358 if (!intf)
2359 return -EINVAL;
2360
2361 if (intf->dev.driver) {
2362 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2363
2364 if (ps->privileges_dropped)
2365 return -EACCES;
2366
2367 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2368 strncmp(dc.driver, intf->dev.driver->name,
2369 sizeof(dc.driver)) != 0)
2370 return -EBUSY;
2371
2372 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2373 strncmp(dc.driver, intf->dev.driver->name,
2374 sizeof(dc.driver)) == 0)
2375 return -EBUSY;
2376
2377 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2378 usb_driver_release_interface(driver, intf);
2379 }
2380
2381 return claimintf(ps, dc.interface);
2382 }
2383
2384 static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2385 {
2386 unsigned num_streams, num_eps;
2387 struct usb_host_endpoint **eps;
2388 struct usb_interface *intf;
2389 int r;
2390
2391 r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2392 &eps, &intf);
2393 if (r)
2394 return r;
2395
2396 destroy_async_on_interface(ps,
2397 intf->altsetting[0].desc.bInterfaceNumber);
2398
2399 r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2400 kfree(eps);
2401 return r;
2402 }
2403
2404 static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2405 {
2406 unsigned num_eps;
2407 struct usb_host_endpoint **eps;
2408 struct usb_interface *intf;
2409 int r;
2410
2411 r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2412 if (r)
2413 return r;
2414
2415 destroy_async_on_interface(ps,
2416 intf->altsetting[0].desc.bInterfaceNumber);
2417
2418 r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2419 kfree(eps);
2420 return r;
2421 }
2422
2423 static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
2424 {
2425 u32 data;
2426
2427 if (copy_from_user(&data, arg, sizeof(data)))
2428 return -EFAULT;
2429
2430 /* This is a one way operation. Once privileges are
2431 * dropped, you cannot regain them. You may however reissue
2432 * this ioctl to shrink the allowed interfaces mask.
2433 */
2434 ps->interface_allowed_mask &= data;
2435 ps->privileges_dropped = true;
2436
2437 return 0;
2438 }
2439
2440 static int proc_forbid_suspend(struct usb_dev_state *ps)
2441 {
2442 int ret = 0;
2443
2444 if (ps->suspend_allowed) {
2445 ret = usb_autoresume_device(ps->dev);
2446 if (ret == 0)
2447 ps->suspend_allowed = false;
2448 else if (ret != -ENODEV)
2449 ret = -EIO;
2450 }
2451 return ret;
2452 }
2453
2454 static int proc_allow_suspend(struct usb_dev_state *ps)
2455 {
2456 if (!connected(ps))
2457 return -ENODEV;
2458
2459 WRITE_ONCE(ps->not_yet_resumed, 1);
2460 if (!ps->suspend_allowed) {
2461 usb_autosuspend_device(ps->dev);
2462 ps->suspend_allowed = true;
2463 }
2464 return 0;
2465 }
2466
2467 static int proc_wait_for_resume(struct usb_dev_state *ps)
2468 {
2469 int ret;
2470
2471 usb_unlock_device(ps->dev);
2472 ret = wait_event_interruptible(ps->wait_for_resume,
2473 READ_ONCE(ps->not_yet_resumed) == 0);
2474 usb_lock_device(ps->dev);
2475
2476 if (ret != 0)
2477 return -EINTR;
2478 return proc_forbid_suspend(ps);
2479 }
2480
2481 /*
2482 * NOTE: All requests here that have interface numbers as parameters
2483 * are assuming that somehow the configuration has been prevented from
2484 * changing. But there's no mechanism to ensure that...
2485 */
2486 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2487 void __user *p)
2488 {
2489 struct usb_dev_state *ps = file->private_data;
2490 struct inode *inode = file_inode(file);
2491 struct usb_device *dev = ps->dev;
2492 int ret = -ENOTTY;
2493
2494 if (!(file->f_mode & FMODE_WRITE))
2495 return -EPERM;
2496
2497 usb_lock_device(dev);
2498
2499 /* Reap operations are allowed even after disconnection */
2500 switch (cmd) {
2501 case USBDEVFS_REAPURB:
2502 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2503 ret = proc_reapurb(ps, p);
2504 goto done;
2505
2506 case USBDEVFS_REAPURBNDELAY:
2507 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2508 ret = proc_reapurbnonblock(ps, p);
2509 goto done;
2510
2511 #ifdef CONFIG_COMPAT
2512 case USBDEVFS_REAPURB32:
2513 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2514 ret = proc_reapurb_compat(ps, p);
2515 goto done;
2516
2517 case USBDEVFS_REAPURBNDELAY32:
2518 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2519 ret = proc_reapurbnonblock_compat(ps, p);
2520 goto done;
2521 #endif
2522 }
2523
2524 if (!connected(ps)) {
2525 usb_unlock_device(dev);
2526 return -ENODEV;
2527 }
2528
2529 switch (cmd) {
2530 case USBDEVFS_CONTROL:
2531 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2532 ret = proc_control(ps, p);
2533 if (ret >= 0)
2534 inode->i_mtime = current_time(inode);
2535 break;
2536
2537 case USBDEVFS_BULK:
2538 snoop(&dev->dev, "%s: BULK\n", __func__);
2539 ret = proc_bulk(ps, p);
2540 if (ret >= 0)
2541 inode->i_mtime = current_time(inode);
2542 break;
2543
2544 case USBDEVFS_RESETEP:
2545 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2546 ret = proc_resetep(ps, p);
2547 if (ret >= 0)
2548 inode->i_mtime = current_time(inode);
2549 break;
2550
2551 case USBDEVFS_RESET:
2552 snoop(&dev->dev, "%s: RESET\n", __func__);
2553 ret = proc_resetdevice(ps);
2554 break;
2555
2556 case USBDEVFS_CLEAR_HALT:
2557 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2558 ret = proc_clearhalt(ps, p);
2559 if (ret >= 0)
2560 inode->i_mtime = current_time(inode);
2561 break;
2562
2563 case USBDEVFS_GETDRIVER:
2564 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2565 ret = proc_getdriver(ps, p);
2566 break;
2567
2568 case USBDEVFS_CONNECTINFO:
2569 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2570 ret = proc_connectinfo(ps, p);
2571 break;
2572
2573 case USBDEVFS_SETINTERFACE:
2574 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2575 ret = proc_setintf(ps, p);
2576 break;
2577
2578 case USBDEVFS_SETCONFIGURATION:
2579 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2580 ret = proc_setconfig(ps, p);
2581 break;
2582
2583 case USBDEVFS_SUBMITURB:
2584 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2585 ret = proc_submiturb(ps, p);
2586 if (ret >= 0)
2587 inode->i_mtime = current_time(inode);
2588 break;
2589
2590 #ifdef CONFIG_COMPAT
2591 case USBDEVFS_CONTROL32:
2592 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2593 ret = proc_control_compat(ps, p);
2594 if (ret >= 0)
2595 inode->i_mtime = current_time(inode);
2596 break;
2597
2598 case USBDEVFS_BULK32:
2599 snoop(&dev->dev, "%s: BULK32\n", __func__);
2600 ret = proc_bulk_compat(ps, p);
2601 if (ret >= 0)
2602 inode->i_mtime = current_time(inode);
2603 break;
2604
2605 case USBDEVFS_DISCSIGNAL32:
2606 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2607 ret = proc_disconnectsignal_compat(ps, p);
2608 break;
2609
2610 case USBDEVFS_SUBMITURB32:
2611 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2612 ret = proc_submiturb_compat(ps, p);
2613 if (ret >= 0)
2614 inode->i_mtime = current_time(inode);
2615 break;
2616
2617 case USBDEVFS_IOCTL32:
2618 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2619 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2620 break;
2621 #endif
2622
2623 case USBDEVFS_DISCARDURB:
2624 snoop(&dev->dev, "%s: DISCARDURB %pK\n", __func__, p);
2625 ret = proc_unlinkurb(ps, p);
2626 break;
2627
2628 case USBDEVFS_DISCSIGNAL:
2629 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2630 ret = proc_disconnectsignal(ps, p);
2631 break;
2632
2633 case USBDEVFS_CLAIMINTERFACE:
2634 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2635 ret = proc_claiminterface(ps, p);
2636 break;
2637
2638 case USBDEVFS_RELEASEINTERFACE:
2639 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2640 ret = proc_releaseinterface(ps, p);
2641 break;
2642
2643 case USBDEVFS_IOCTL:
2644 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2645 ret = proc_ioctl_default(ps, p);
2646 break;
2647
2648 case USBDEVFS_CLAIM_PORT:
2649 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2650 ret = proc_claim_port(ps, p);
2651 break;
2652
2653 case USBDEVFS_RELEASE_PORT:
2654 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2655 ret = proc_release_port(ps, p);
2656 break;
2657 case USBDEVFS_GET_CAPABILITIES:
2658 ret = proc_get_capabilities(ps, p);
2659 break;
2660 case USBDEVFS_DISCONNECT_CLAIM:
2661 ret = proc_disconnect_claim(ps, p);
2662 break;
2663 case USBDEVFS_ALLOC_STREAMS:
2664 ret = proc_alloc_streams(ps, p);
2665 break;
2666 case USBDEVFS_FREE_STREAMS:
2667 ret = proc_free_streams(ps, p);
2668 break;
2669 case USBDEVFS_DROP_PRIVILEGES:
2670 ret = proc_drop_privileges(ps, p);
2671 break;
2672 case USBDEVFS_GET_SPEED:
2673 ret = ps->dev->speed;
2674 break;
2675 case USBDEVFS_FORBID_SUSPEND:
2676 ret = proc_forbid_suspend(ps);
2677 break;
2678 case USBDEVFS_ALLOW_SUSPEND:
2679 ret = proc_allow_suspend(ps);
2680 break;
2681 case USBDEVFS_WAIT_FOR_RESUME:
2682 ret = proc_wait_for_resume(ps);
2683 break;
2684 }
2685
2686 /* Handle variable-length commands */
2687 switch (cmd & ~IOCSIZE_MASK) {
2688 case USBDEVFS_CONNINFO_EX(0):
2689 ret = proc_conninfo_ex(ps, p, _IOC_SIZE(cmd));
2690 break;
2691 }
2692
2693 done:
2694 usb_unlock_device(dev);
2695 if (ret >= 0)
2696 inode->i_atime = current_time(inode);
2697 return ret;
2698 }
2699
2700 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2701 unsigned long arg)
2702 {
2703 int ret;
2704
2705 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2706
2707 return ret;
2708 }
2709
2710 /* No kernel lock - fine */
2711 static __poll_t usbdev_poll(struct file *file,
2712 struct poll_table_struct *wait)
2713 {
2714 struct usb_dev_state *ps = file->private_data;
2715 __poll_t mask = 0;
2716
2717 poll_wait(file, &ps->wait, wait);
2718 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2719 mask |= EPOLLOUT | EPOLLWRNORM;
2720 if (!connected(ps))
2721 mask |= EPOLLHUP;
2722 if (list_empty(&ps->list))
2723 mask |= EPOLLERR;
2724 return mask;
2725 }
2726
2727 const struct file_operations usbdev_file_operations = {
2728 .owner = THIS_MODULE,
2729 .llseek = no_seek_end_llseek,
2730 .read = usbdev_read,
2731 .poll = usbdev_poll,
2732 .unlocked_ioctl = usbdev_ioctl,
2733 .compat_ioctl = compat_ptr_ioctl,
2734 .mmap = usbdev_mmap,
2735 .open = usbdev_open,
2736 .release = usbdev_release,
2737 };
2738
2739 static void usbdev_remove(struct usb_device *udev)
2740 {
2741 struct usb_dev_state *ps;
2742
2743 /* Protect against simultaneous resume */
2744 mutex_lock(&usbfs_mutex);
2745 while (!list_empty(&udev->filelist)) {
2746 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2747 destroy_all_async(ps);
2748 wake_up_all(&ps->wait);
2749 WRITE_ONCE(ps->not_yet_resumed, 0);
2750 wake_up_all(&ps->wait_for_resume);
2751 list_del_init(&ps->list);
2752 if (ps->discsignr)
2753 kill_pid_usb_asyncio(ps->discsignr, EPIPE, ps->disccontext,
2754 ps->disc_pid, ps->cred);
2755 }
2756 mutex_unlock(&usbfs_mutex);
2757 }
2758
2759 static int usbdev_notify(struct notifier_block *self,
2760 unsigned long action, void *dev)
2761 {
2762 switch (action) {
2763 case USB_DEVICE_ADD:
2764 break;
2765 case USB_DEVICE_REMOVE:
2766 usbdev_remove(dev);
2767 break;
2768 }
2769 return NOTIFY_OK;
2770 }
2771
2772 static struct notifier_block usbdev_nb = {
2773 .notifier_call = usbdev_notify,
2774 };
2775
2776 static struct cdev usb_device_cdev;
2777
2778 int __init usb_devio_init(void)
2779 {
2780 int retval;
2781
2782 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2783 "usb_device");
2784 if (retval) {
2785 printk(KERN_ERR "Unable to register minors for usb_device\n");
2786 goto out;
2787 }
2788 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2789 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2790 if (retval) {
2791 printk(KERN_ERR "Unable to get usb_device major %d\n",
2792 USB_DEVICE_MAJOR);
2793 goto error_cdev;
2794 }
2795 usb_register_notify(&usbdev_nb);
2796 out:
2797 return retval;
2798
2799 error_cdev:
2800 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2801 goto out;
2802 }
2803
2804 void usb_devio_cleanup(void)
2805 {
2806 usb_unregister_notify(&usbdev_nb);
2807 cdev_del(&usb_device_cdev);
2808 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2809 }
A mirror of Linus' kernel repository