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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/usb/quirks.h>
36#include <linux/cdev.h>
37#include <linux/notifier.h>
38#include <linux/security.h>
39#include <linux/user_namespace.h>
40#include <linux/scatterlist.h>
41#include <linux/uaccess.h>
42#include <linux/dma-mapping.h>
43#include <asm/byteorder.h>
44#include <linux/moduleparam.h>
45
46#include "usb.h"
47
48#ifdef CONFIG_PM
49#define MAYBE_CAP_SUSPEND USBDEVFS_CAP_SUSPEND
50#else
51#define MAYBE_CAP_SUSPEND 0
52#endif
53
54#define USB_MAXBUS 64
55#define USB_DEVICE_MAX (USB_MAXBUS * 128)
56#define USB_SG_SIZE 16384 /* split-size for large txs */
57
58/* Mutual exclusion for ps->list in resume vs. release and remove */
59static DEFINE_MUTEX(usbfs_mutex);
60
61struct usb_dev_state {
62 struct list_head list; /* state list */
63 struct usb_device *dev;
64 struct file *file;
65 spinlock_t lock; /* protects the async urb lists */
66 struct list_head async_pending;
67 struct list_head async_completed;
68 struct list_head memory_list;
69 wait_queue_head_t wait; /* wake up if a request completed */
70 wait_queue_head_t wait_for_resume; /* wake up upon runtime resume */
71 unsigned int discsignr;
72 struct pid *disc_pid;
73 const struct cred *cred;
74 sigval_t disccontext;
75 unsigned long ifclaimed;
76 u32 disabled_bulk_eps;
77 unsigned long interface_allowed_mask;
78 int not_yet_resumed;
79 bool suspend_allowed;
80 bool privileges_dropped;
81};
82
83struct usb_memory {
84 struct list_head memlist;
85 int vma_use_count;
86 int urb_use_count;
87 u32 size;
88 void *mem;
89 dma_addr_t dma_handle;
90 unsigned long vm_start;
91 struct usb_dev_state *ps;
92};
93
94struct async {
95 struct list_head asynclist;
96 struct usb_dev_state *ps;
97 struct pid *pid;
98 const struct cred *cred;
99 unsigned int signr;
100 unsigned int ifnum;
101 void __user *userbuffer;
102 void __user *userurb;
103 sigval_t userurb_sigval;
104 struct urb *urb;
105 struct usb_memory *usbm;
106 unsigned int mem_usage;
107 int status;
108 u8 bulk_addr;
109 u8 bulk_status;
110};
111
112static bool usbfs_snoop;
113module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
114MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
115
116static unsigned usbfs_snoop_max = 65536;
117module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR);
118MODULE_PARM_DESC(usbfs_snoop_max,
119 "maximum number of bytes to print while snooping");
120
121#define snoop(dev, format, arg...) \
122 do { \
123 if (usbfs_snoop) \
124 dev_info(dev, format, ## arg); \
125 } while (0)
126
127enum snoop_when {
128 SUBMIT, COMPLETE
129};
130
131#define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
132
133/* Limit on the total amount of memory we can allocate for transfers */
134static u32 usbfs_memory_mb = 16;
135module_param(usbfs_memory_mb, uint, 0644);
136MODULE_PARM_DESC(usbfs_memory_mb,
137 "maximum MB allowed for usbfs buffers (0 = no limit)");
138
139/* Hard limit, necessary to avoid arithmetic overflow */
140#define USBFS_XFER_MAX (UINT_MAX / 2 - 1000000)
141
142static DEFINE_SPINLOCK(usbfs_memory_usage_lock);
143static u64 usbfs_memory_usage; /* Total memory currently allocated */
144
145/* Check whether it's okay to allocate more memory for a transfer */
146static int usbfs_increase_memory_usage(u64 amount)
147{
148 u64 lim, total_mem;
149 unsigned long flags;
150 int ret;
151
152 lim = READ_ONCE(usbfs_memory_mb);
153 lim <<= 20;
154
155 ret = 0;
156 spin_lock_irqsave(&usbfs_memory_usage_lock, flags);
157 total_mem = usbfs_memory_usage + amount;
158 if (lim > 0 && total_mem > lim)
159 ret = -ENOMEM;
160 else
161 usbfs_memory_usage = total_mem;
162 spin_unlock_irqrestore(&usbfs_memory_usage_lock, flags);
163
164 return ret;
165}
166
167/* Memory for a transfer is being deallocated */
168static void usbfs_decrease_memory_usage(u64 amount)
169{
170 unsigned long flags;
171
172 spin_lock_irqsave(&usbfs_memory_usage_lock, flags);
173 if (amount > usbfs_memory_usage)
174 usbfs_memory_usage = 0;
175 else
176 usbfs_memory_usage -= amount;
177 spin_unlock_irqrestore(&usbfs_memory_usage_lock, flags);
178}
179
180static int connected(struct usb_dev_state *ps)
181{
182 return (!list_empty(&ps->list) &&
183 ps->dev->state != USB_STATE_NOTATTACHED);
184}
185
186static void dec_usb_memory_use_count(struct usb_memory *usbm, int *count)
187{
188 struct usb_dev_state *ps = usbm->ps;
189 unsigned long flags;
190
191 spin_lock_irqsave(&ps->lock, flags);
192 --*count;
193 if (usbm->urb_use_count == 0 && usbm->vma_use_count == 0) {
194 list_del(&usbm->memlist);
195 spin_unlock_irqrestore(&ps->lock, flags);
196
197 usb_free_coherent(ps->dev, usbm->size, usbm->mem,
198 usbm->dma_handle);
199 usbfs_decrease_memory_usage(
200 usbm->size + sizeof(struct usb_memory));
201 kfree(usbm);
202 } else {
203 spin_unlock_irqrestore(&ps->lock, flags);
204 }
205}
206
207static void usbdev_vm_open(struct vm_area_struct *vma)
208{
209 struct usb_memory *usbm = vma->vm_private_data;
210 unsigned long flags;
211
212 spin_lock_irqsave(&usbm->ps->lock, flags);
213 ++usbm->vma_use_count;
214 spin_unlock_irqrestore(&usbm->ps->lock, flags);
215}
216
217static void usbdev_vm_close(struct vm_area_struct *vma)
218{
219 struct usb_memory *usbm = vma->vm_private_data;
220
221 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
222}
223
224static const struct vm_operations_struct usbdev_vm_ops = {
225 .open = usbdev_vm_open,
226 .close = usbdev_vm_close
227};
228
229static int usbdev_mmap(struct file *file, struct vm_area_struct *vma)
230{
231 struct usb_memory *usbm = NULL;
232 struct usb_dev_state *ps = file->private_data;
233 struct usb_hcd *hcd = bus_to_hcd(ps->dev->bus);
234 size_t size = vma->vm_end - vma->vm_start;
235 void *mem;
236 unsigned long flags;
237 dma_addr_t dma_handle;
238 int ret;
239
240 ret = usbfs_increase_memory_usage(size + sizeof(struct usb_memory));
241 if (ret)
242 goto error;
243
244 usbm = kzalloc(sizeof(struct usb_memory), GFP_KERNEL);
245 if (!usbm) {
246 ret = -ENOMEM;
247 goto error_decrease_mem;
248 }
249
250 mem = usb_alloc_coherent(ps->dev, size, GFP_USER | __GFP_NOWARN,
251 &dma_handle);
252 if (!mem) {
253 ret = -ENOMEM;
254 goto error_free_usbm;
255 }
256
257 memset(mem, 0, size);
258
259 usbm->mem = mem;
260 usbm->dma_handle = dma_handle;
261 usbm->size = size;
262 usbm->ps = ps;
263 usbm->vm_start = vma->vm_start;
264 usbm->vma_use_count = 1;
265 INIT_LIST_HEAD(&usbm->memlist);
266
267 if (hcd->localmem_pool || !hcd_uses_dma(hcd)) {
268 if (remap_pfn_range(vma, vma->vm_start,
269 virt_to_phys(usbm->mem) >> PAGE_SHIFT,
270 size, vma->vm_page_prot) < 0) {
271 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
272 return -EAGAIN;
273 }
274 } else {
275 if (dma_mmap_coherent(hcd->self.sysdev, vma, mem, dma_handle,
276 size)) {
277 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
278 return -EAGAIN;
279 }
280 }
281
282 vma->vm_flags |= VM_IO;
283 vma->vm_flags |= (VM_DONTEXPAND | VM_DONTDUMP);
284 vma->vm_ops = &usbdev_vm_ops;
285 vma->vm_private_data = usbm;
286
287 spin_lock_irqsave(&ps->lock, flags);
288 list_add_tail(&usbm->memlist, &ps->memory_list);
289 spin_unlock_irqrestore(&ps->lock, flags);
290
291 return 0;
292
293error_free_usbm:
294 kfree(usbm);
295error_decrease_mem:
296 usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
297error:
298 return ret;
299}
300
301static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
302 loff_t *ppos)
303{
304 struct usb_dev_state *ps = file->private_data;
305 struct usb_device *dev = ps->dev;
306 ssize_t ret = 0;
307 unsigned len;
308 loff_t pos;
309 int i;
310
311 pos = *ppos;
312 usb_lock_device(dev);
313 if (!connected(ps)) {
314 ret = -ENODEV;
315 goto err;
316 } else if (pos < 0) {
317 ret = -EINVAL;
318 goto err;
319 }
320
321 if (pos < sizeof(struct usb_device_descriptor)) {
322 /* 18 bytes - fits on the stack */
323 struct usb_device_descriptor temp_desc;
324
325 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
326 le16_to_cpus(&temp_desc.bcdUSB);
327 le16_to_cpus(&temp_desc.idVendor);
328 le16_to_cpus(&temp_desc.idProduct);
329 le16_to_cpus(&temp_desc.bcdDevice);
330
331 len = sizeof(struct usb_device_descriptor) - pos;
332 if (len > nbytes)
333 len = nbytes;
334 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
335 ret = -EFAULT;
336 goto err;
337 }
338
339 *ppos += len;
340 buf += len;
341 nbytes -= len;
342 ret += len;
343 }
344
345 pos = sizeof(struct usb_device_descriptor);
346 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
347 struct usb_config_descriptor *config =
348 (struct usb_config_descriptor *)dev->rawdescriptors[i];
349 unsigned int length = le16_to_cpu(config->wTotalLength);
350
351 if (*ppos < pos + length) {
352
353 /* The descriptor may claim to be longer than it
354 * really is. Here is the actual allocated length. */
355 unsigned alloclen =
356 le16_to_cpu(dev->config[i].desc.wTotalLength);
357
358 len = length - (*ppos - pos);
359 if (len > nbytes)
360 len = nbytes;
361
362 /* Simply don't write (skip over) unallocated parts */
363 if (alloclen > (*ppos - pos)) {
364 alloclen -= (*ppos - pos);
365 if (copy_to_user(buf,
366 dev->rawdescriptors[i] + (*ppos - pos),
367 min(len, alloclen))) {
368 ret = -EFAULT;
369 goto err;
370 }
371 }
372
373 *ppos += len;
374 buf += len;
375 nbytes -= len;
376 ret += len;
377 }
378
379 pos += length;
380 }
381
382err:
383 usb_unlock_device(dev);
384 return ret;
385}
386
387/*
388 * async list handling
389 */
390
391static struct async *alloc_async(unsigned int numisoframes)
392{
393 struct async *as;
394
395 as = kzalloc(sizeof(struct async), GFP_KERNEL);
396 if (!as)
397 return NULL;
398 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
399 if (!as->urb) {
400 kfree(as);
401 return NULL;
402 }
403 return as;
404}
405
406static void free_async(struct async *as)
407{
408 int i;
409
410 put_pid(as->pid);
411 if (as->cred)
412 put_cred(as->cred);
413 for (i = 0; i < as->urb->num_sgs; i++) {
414 if (sg_page(&as->urb->sg[i]))
415 kfree(sg_virt(&as->urb->sg[i]));
416 }
417
418 kfree(as->urb->sg);
419 if (as->usbm == NULL)
420 kfree(as->urb->transfer_buffer);
421 else
422 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
423
424 kfree(as->urb->setup_packet);
425 usb_free_urb(as->urb);
426 usbfs_decrease_memory_usage(as->mem_usage);
427 kfree(as);
428}
429
430static void async_newpending(struct async *as)
431{
432 struct usb_dev_state *ps = as->ps;
433 unsigned long flags;
434
435 spin_lock_irqsave(&ps->lock, flags);
436 list_add_tail(&as->asynclist, &ps->async_pending);
437 spin_unlock_irqrestore(&ps->lock, flags);
438}
439
440static void async_removepending(struct async *as)
441{
442 struct usb_dev_state *ps = as->ps;
443 unsigned long flags;
444
445 spin_lock_irqsave(&ps->lock, flags);
446 list_del_init(&as->asynclist);
447 spin_unlock_irqrestore(&ps->lock, flags);
448}
449
450static struct async *async_getcompleted(struct usb_dev_state *ps)
451{
452 unsigned long flags;
453 struct async *as = NULL;
454
455 spin_lock_irqsave(&ps->lock, flags);
456 if (!list_empty(&ps->async_completed)) {
457 as = list_entry(ps->async_completed.next, struct async,
458 asynclist);
459 list_del_init(&as->asynclist);
460 }
461 spin_unlock_irqrestore(&ps->lock, flags);
462 return as;
463}
464
465static struct async *async_getpending(struct usb_dev_state *ps,
466 void __user *userurb)
467{
468 struct async *as;
469
470 list_for_each_entry(as, &ps->async_pending, asynclist)
471 if (as->userurb == userurb) {
472 list_del_init(&as->asynclist);
473 return as;
474 }
475
476 return NULL;
477}
478
479static void snoop_urb(struct usb_device *udev,
480 void __user *userurb, int pipe, unsigned length,
481 int timeout_or_status, enum snoop_when when,
482 unsigned char *data, unsigned data_len)
483{
484 static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
485 static const char *dirs[] = {"out", "in"};
486 int ep;
487 const char *t, *d;
488
489 if (!usbfs_snoop)
490 return;
491
492 ep = usb_pipeendpoint(pipe);
493 t = types[usb_pipetype(pipe)];
494 d = dirs[!!usb_pipein(pipe)];
495
496 if (userurb) { /* Async */
497 if (when == SUBMIT)
498 dev_info(&udev->dev, "userurb %px, ep%d %s-%s, "
499 "length %u\n",
500 userurb, ep, t, d, length);
501 else
502 dev_info(&udev->dev, "userurb %px, ep%d %s-%s, "
503 "actual_length %u status %d\n",
504 userurb, ep, t, d, length,
505 timeout_or_status);
506 } else {
507 if (when == SUBMIT)
508 dev_info(&udev->dev, "ep%d %s-%s, length %u, "
509 "timeout %d\n",
510 ep, t, d, length, timeout_or_status);
511 else
512 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
513 "status %d\n",
514 ep, t, d, length, timeout_or_status);
515 }
516
517 data_len = min(data_len, usbfs_snoop_max);
518 if (data && data_len > 0) {
519 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
520 data, data_len, 1);
521 }
522}
523
524static void snoop_urb_data(struct urb *urb, unsigned len)
525{
526 int i, size;
527
528 len = min(len, usbfs_snoop_max);
529 if (!usbfs_snoop || len == 0)
530 return;
531
532 if (urb->num_sgs == 0) {
533 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
534 urb->transfer_buffer, len, 1);
535 return;
536 }
537
538 for (i = 0; i < urb->num_sgs && len; i++) {
539 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
540 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
541 sg_virt(&urb->sg[i]), size, 1);
542 len -= size;
543 }
544}
545
546static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
547{
548 unsigned i, len, size;
549
550 if (urb->number_of_packets > 0) /* Isochronous */
551 len = urb->transfer_buffer_length;
552 else /* Non-Isoc */
553 len = urb->actual_length;
554
555 if (urb->num_sgs == 0) {
556 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
557 return -EFAULT;
558 return 0;
559 }
560
561 for (i = 0; i < urb->num_sgs && len; i++) {
562 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
563 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
564 return -EFAULT;
565 userbuffer += size;
566 len -= size;
567 }
568
569 return 0;
570}
571
572#define AS_CONTINUATION 1
573#define AS_UNLINK 2
574
575static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
576__releases(ps->lock)
577__acquires(ps->lock)
578{
579 struct urb *urb;
580 struct async *as;
581
582 /* Mark all the pending URBs that match bulk_addr, up to but not
583 * including the first one without AS_CONTINUATION. If such an
584 * URB is encountered then a new transfer has already started so
585 * the endpoint doesn't need to be disabled; otherwise it does.
586 */
587 list_for_each_entry(as, &ps->async_pending, asynclist) {
588 if (as->bulk_addr == bulk_addr) {
589 if (as->bulk_status != AS_CONTINUATION)
590 goto rescan;
591 as->bulk_status = AS_UNLINK;
592 as->bulk_addr = 0;
593 }
594 }
595 ps->disabled_bulk_eps |= (1 << bulk_addr);
596
597 /* Now carefully unlink all the marked pending URBs */
598 rescan:
599 list_for_each_entry_reverse(as, &ps->async_pending, asynclist) {
600 if (as->bulk_status == AS_UNLINK) {
601 as->bulk_status = 0; /* Only once */
602 urb = as->urb;
603 usb_get_urb(urb);
604 spin_unlock(&ps->lock); /* Allow completions */
605 usb_unlink_urb(urb);
606 usb_put_urb(urb);
607 spin_lock(&ps->lock);
608 goto rescan;
609 }
610 }
611}
612
613static void async_completed(struct urb *urb)
614{
615 struct async *as = urb->context;
616 struct usb_dev_state *ps = as->ps;
617 struct pid *pid = NULL;
618 const struct cred *cred = NULL;
619 unsigned long flags;
620 sigval_t addr;
621 int signr, errno;
622
623 spin_lock_irqsave(&ps->lock, flags);
624 list_move_tail(&as->asynclist, &ps->async_completed);
625 as->status = urb->status;
626 signr = as->signr;
627 if (signr) {
628 errno = as->status;
629 addr = as->userurb_sigval;
630 pid = get_pid(as->pid);
631 cred = get_cred(as->cred);
632 }
633 snoop(&urb->dev->dev, "urb complete\n");
634 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
635 as->status, COMPLETE, NULL, 0);
636 if (usb_urb_dir_in(urb))
637 snoop_urb_data(urb, urb->actual_length);
638
639 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
640 as->status != -ENOENT)
641 cancel_bulk_urbs(ps, as->bulk_addr);
642
643 wake_up(&ps->wait);
644 spin_unlock_irqrestore(&ps->lock, flags);
645
646 if (signr) {
647 kill_pid_usb_asyncio(signr, errno, addr, pid, cred);
648 put_pid(pid);
649 put_cred(cred);
650 }
651}
652
653static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
654{
655 struct urb *urb;
656 struct async *as;
657 unsigned long flags;
658
659 spin_lock_irqsave(&ps->lock, flags);
660 while (!list_empty(list)) {
661 as = list_last_entry(list, struct async, asynclist);
662 list_del_init(&as->asynclist);
663 urb = as->urb;
664 usb_get_urb(urb);
665
666 /* drop the spinlock so the completion handler can run */
667 spin_unlock_irqrestore(&ps->lock, flags);
668 usb_kill_urb(urb);
669 usb_put_urb(urb);
670 spin_lock_irqsave(&ps->lock, flags);
671 }
672 spin_unlock_irqrestore(&ps->lock, flags);
673}
674
675static void destroy_async_on_interface(struct usb_dev_state *ps,
676 unsigned int ifnum)
677{
678 struct list_head *p, *q, hitlist;
679 unsigned long flags;
680
681 INIT_LIST_HEAD(&hitlist);
682 spin_lock_irqsave(&ps->lock, flags);
683 list_for_each_safe(p, q, &ps->async_pending)
684 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
685 list_move_tail(p, &hitlist);
686 spin_unlock_irqrestore(&ps->lock, flags);
687 destroy_async(ps, &hitlist);
688}
689
690static void destroy_all_async(struct usb_dev_state *ps)
691{
692 destroy_async(ps, &ps->async_pending);
693}
694
695/*
696 * interface claims are made only at the request of user level code,
697 * which can also release them (explicitly or by closing files).
698 * they're also undone when devices disconnect.
699 */
700
701static int driver_probe(struct usb_interface *intf,
702 const struct usb_device_id *id)
703{
704 return -ENODEV;
705}
706
707static void driver_disconnect(struct usb_interface *intf)
708{
709 struct usb_dev_state *ps = usb_get_intfdata(intf);
710 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
711
712 if (!ps)
713 return;
714
715 /* NOTE: this relies on usbcore having canceled and completed
716 * all pending I/O requests; 2.6 does that.
717 */
718
719 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
720 clear_bit(ifnum, &ps->ifclaimed);
721 else
722 dev_warn(&intf->dev, "interface number %u out of range\n",
723 ifnum);
724
725 usb_set_intfdata(intf, NULL);
726
727 /* force async requests to complete */
728 destroy_async_on_interface(ps, ifnum);
729}
730
731/* We don't care about suspend/resume of claimed interfaces */
732static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
733{
734 return 0;
735}
736
737static int driver_resume(struct usb_interface *intf)
738{
739 return 0;
740}
741
742/* The following routines apply to the entire device, not interfaces */
743void usbfs_notify_suspend(struct usb_device *udev)
744{
745 /* We don't need to handle this */
746}
747
748void usbfs_notify_resume(struct usb_device *udev)
749{
750 struct usb_dev_state *ps;
751
752 /* Protect against simultaneous remove or release */
753 mutex_lock(&usbfs_mutex);
754 list_for_each_entry(ps, &udev->filelist, list) {
755 WRITE_ONCE(ps->not_yet_resumed, 0);
756 wake_up_all(&ps->wait_for_resume);
757 }
758 mutex_unlock(&usbfs_mutex);
759}
760
761struct usb_driver usbfs_driver = {
762 .name = "usbfs",
763 .probe = driver_probe,
764 .disconnect = driver_disconnect,
765 .suspend = driver_suspend,
766 .resume = driver_resume,
767 .supports_autosuspend = 1,
768};
769
770static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
771{
772 struct usb_device *dev = ps->dev;
773 struct usb_interface *intf;
774 int err;
775
776 if (ifnum >= 8*sizeof(ps->ifclaimed))
777 return -EINVAL;
778 /* already claimed */
779 if (test_bit(ifnum, &ps->ifclaimed))
780 return 0;
781
782 if (ps->privileges_dropped &&
783 !test_bit(ifnum, &ps->interface_allowed_mask))
784 return -EACCES;
785
786 intf = usb_ifnum_to_if(dev, ifnum);
787 if (!intf)
788 err = -ENOENT;
789 else {
790 unsigned int old_suppress;
791
792 /* suppress uevents while claiming interface */
793 old_suppress = dev_get_uevent_suppress(&intf->dev);
794 dev_set_uevent_suppress(&intf->dev, 1);
795 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
796 dev_set_uevent_suppress(&intf->dev, old_suppress);
797 }
798 if (err == 0)
799 set_bit(ifnum, &ps->ifclaimed);
800 return err;
801}
802
803static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
804{
805 struct usb_device *dev;
806 struct usb_interface *intf;
807 int err;
808
809 err = -EINVAL;
810 if (ifnum >= 8*sizeof(ps->ifclaimed))
811 return err;
812 dev = ps->dev;
813 intf = usb_ifnum_to_if(dev, ifnum);
814 if (!intf)
815 err = -ENOENT;
816 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
817 unsigned int old_suppress;
818
819 /* suppress uevents while releasing interface */
820 old_suppress = dev_get_uevent_suppress(&intf->dev);
821 dev_set_uevent_suppress(&intf->dev, 1);
822 usb_driver_release_interface(&usbfs_driver, intf);
823 dev_set_uevent_suppress(&intf->dev, old_suppress);
824 err = 0;
825 }
826 return err;
827}
828
829static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
830{
831 if (ps->dev->state != USB_STATE_CONFIGURED)
832 return -EHOSTUNREACH;
833 if (ifnum >= 8*sizeof(ps->ifclaimed))
834 return -EINVAL;
835 if (test_bit(ifnum, &ps->ifclaimed))
836 return 0;
837 /* if not yet claimed, claim it for the driver */
838 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
839 "interface %u before use\n", task_pid_nr(current),
840 current->comm, ifnum);
841 return claimintf(ps, ifnum);
842}
843
844static int findintfep(struct usb_device *dev, unsigned int ep)
845{
846 unsigned int i, j, e;
847 struct usb_interface *intf;
848 struct usb_host_interface *alts;
849 struct usb_endpoint_descriptor *endpt;
850
851 if (ep & ~(USB_DIR_IN|0xf))
852 return -EINVAL;
853 if (!dev->actconfig)
854 return -ESRCH;
855 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
856 intf = dev->actconfig->interface[i];
857 for (j = 0; j < intf->num_altsetting; j++) {
858 alts = &intf->altsetting[j];
859 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
860 endpt = &alts->endpoint[e].desc;
861 if (endpt->bEndpointAddress == ep)
862 return alts->desc.bInterfaceNumber;
863 }
864 }
865 }
866 return -ENOENT;
867}
868
869static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
870 unsigned int request, unsigned int index)
871{
872 int ret = 0;
873 struct usb_host_interface *alt_setting;
874
875 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
876 && ps->dev->state != USB_STATE_ADDRESS
877 && ps->dev->state != USB_STATE_CONFIGURED)
878 return -EHOSTUNREACH;
879 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
880 return 0;
881
882 /*
883 * check for the special corner case 'get_device_id' in the printer
884 * class specification, which we always want to allow as it is used
885 * to query things like ink level, etc.
886 */
887 if (requesttype == 0xa1 && request == 0) {
888 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
889 index >> 8, index & 0xff);
890 if (alt_setting
891 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
892 return 0;
893 }
894
895 index &= 0xff;
896 switch (requesttype & USB_RECIP_MASK) {
897 case USB_RECIP_ENDPOINT:
898 if ((index & ~USB_DIR_IN) == 0)
899 return 0;
900 ret = findintfep(ps->dev, index);
901 if (ret < 0) {
902 /*
903 * Some not fully compliant Win apps seem to get
904 * index wrong and have the endpoint number here
905 * rather than the endpoint address (with the
906 * correct direction). Win does let this through,
907 * so we'll not reject it here but leave it to
908 * the device to not break KVM. But we warn.
909 */
910 ret = findintfep(ps->dev, index ^ 0x80);
911 if (ret >= 0)
912 dev_info(&ps->dev->dev,
913 "%s: process %i (%s) requesting ep %02x but needs %02x\n",
914 __func__, task_pid_nr(current),
915 current->comm, index, index ^ 0x80);
916 }
917 if (ret >= 0)
918 ret = checkintf(ps, ret);
919 break;
920
921 case USB_RECIP_INTERFACE:
922 ret = checkintf(ps, index);
923 break;
924 }
925 return ret;
926}
927
928static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
929 unsigned char ep)
930{
931 if (ep & USB_ENDPOINT_DIR_MASK)
932 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
933 else
934 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
935}
936
937static int parse_usbdevfs_streams(struct usb_dev_state *ps,
938 struct usbdevfs_streams __user *streams,
939 unsigned int *num_streams_ret,
940 unsigned int *num_eps_ret,
941 struct usb_host_endpoint ***eps_ret,
942 struct usb_interface **intf_ret)
943{
944 unsigned int i, num_streams, num_eps;
945 struct usb_host_endpoint **eps;
946 struct usb_interface *intf = NULL;
947 unsigned char ep;
948 int ifnum, ret;
949
950 if (get_user(num_streams, &streams->num_streams) ||
951 get_user(num_eps, &streams->num_eps))
952 return -EFAULT;
953
954 if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
955 return -EINVAL;
956
957 /* The XHCI controller allows max 2 ^ 16 streams */
958 if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
959 return -EINVAL;
960
961 eps = kmalloc_array(num_eps, sizeof(*eps), GFP_KERNEL);
962 if (!eps)
963 return -ENOMEM;
964
965 for (i = 0; i < num_eps; i++) {
966 if (get_user(ep, &streams->eps[i])) {
967 ret = -EFAULT;
968 goto error;
969 }
970 eps[i] = ep_to_host_endpoint(ps->dev, ep);
971 if (!eps[i]) {
972 ret = -EINVAL;
973 goto error;
974 }
975
976 /* usb_alloc/free_streams operate on an usb_interface */
977 ifnum = findintfep(ps->dev, ep);
978 if (ifnum < 0) {
979 ret = ifnum;
980 goto error;
981 }
982
983 if (i == 0) {
984 ret = checkintf(ps, ifnum);
985 if (ret < 0)
986 goto error;
987 intf = usb_ifnum_to_if(ps->dev, ifnum);
988 } else {
989 /* Verify all eps belong to the same interface */
990 if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
991 ret = -EINVAL;
992 goto error;
993 }
994 }
995 }
996
997 if (num_streams_ret)
998 *num_streams_ret = num_streams;
999 *num_eps_ret = num_eps;
1000 *eps_ret = eps;
1001 *intf_ret = intf;
1002
1003 return 0;
1004
1005error:
1006 kfree(eps);
1007 return ret;
1008}
1009
1010static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
1011{
1012 struct device *dev;
1013
1014 dev = bus_find_device_by_devt(&usb_bus_type, devt);
1015 if (!dev)
1016 return NULL;
1017 return to_usb_device(dev);
1018}
1019
1020/*
1021 * file operations
1022 */
1023static int usbdev_open(struct inode *inode, struct file *file)
1024{
1025 struct usb_device *dev = NULL;
1026 struct usb_dev_state *ps;
1027 int ret;
1028
1029 ret = -ENOMEM;
1030 ps = kzalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
1031 if (!ps)
1032 goto out_free_ps;
1033
1034 ret = -ENODEV;
1035
1036 /* usbdev device-node */
1037 if (imajor(inode) == USB_DEVICE_MAJOR)
1038 dev = usbdev_lookup_by_devt(inode->i_rdev);
1039 if (!dev)
1040 goto out_free_ps;
1041
1042 usb_lock_device(dev);
1043 if (dev->state == USB_STATE_NOTATTACHED)
1044 goto out_unlock_device;
1045
1046 ret = usb_autoresume_device(dev);
1047 if (ret)
1048 goto out_unlock_device;
1049
1050 ps->dev = dev;
1051 ps->file = file;
1052 ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
1053 spin_lock_init(&ps->lock);
1054 INIT_LIST_HEAD(&ps->list);
1055 INIT_LIST_HEAD(&ps->async_pending);
1056 INIT_LIST_HEAD(&ps->async_completed);
1057 INIT_LIST_HEAD(&ps->memory_list);
1058 init_waitqueue_head(&ps->wait);
1059 init_waitqueue_head(&ps->wait_for_resume);
1060 ps->disc_pid = get_pid(task_pid(current));
1061 ps->cred = get_current_cred();
1062 smp_wmb();
1063
1064 /* Can't race with resume; the device is already active */
1065 list_add_tail(&ps->list, &dev->filelist);
1066 file->private_data = ps;
1067 usb_unlock_device(dev);
1068 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
1069 current->comm);
1070 return ret;
1071
1072 out_unlock_device:
1073 usb_unlock_device(dev);
1074 usb_put_dev(dev);
1075 out_free_ps:
1076 kfree(ps);
1077 return ret;
1078}
1079
1080static int usbdev_release(struct inode *inode, struct file *file)
1081{
1082 struct usb_dev_state *ps = file->private_data;
1083 struct usb_device *dev = ps->dev;
1084 unsigned int ifnum;
1085 struct async *as;
1086
1087 usb_lock_device(dev);
1088 usb_hub_release_all_ports(dev, ps);
1089
1090 /* Protect against simultaneous resume */
1091 mutex_lock(&usbfs_mutex);
1092 list_del_init(&ps->list);
1093 mutex_unlock(&usbfs_mutex);
1094
1095 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
1096 ifnum++) {
1097 if (test_bit(ifnum, &ps->ifclaimed))
1098 releaseintf(ps, ifnum);
1099 }
1100 destroy_all_async(ps);
1101 if (!ps->suspend_allowed)
1102 usb_autosuspend_device(dev);
1103 usb_unlock_device(dev);
1104 usb_put_dev(dev);
1105 put_pid(ps->disc_pid);
1106 put_cred(ps->cred);
1107
1108 as = async_getcompleted(ps);
1109 while (as) {
1110 free_async(as);
1111 as = async_getcompleted(ps);
1112 }
1113
1114 kfree(ps);
1115 return 0;
1116}
1117
1118static void usbfs_blocking_completion(struct urb *urb)
1119{
1120 complete((struct completion *) urb->context);
1121}
1122
1123/*
1124 * Much like usb_start_wait_urb, but returns status separately from
1125 * actual_length and uses a killable wait.
1126 */
1127static int usbfs_start_wait_urb(struct urb *urb, int timeout,
1128 unsigned int *actlen)
1129{
1130 DECLARE_COMPLETION_ONSTACK(ctx);
1131 unsigned long expire;
1132 int rc;
1133
1134 urb->context = &ctx;
1135 urb->complete = usbfs_blocking_completion;
1136 *actlen = 0;
1137 rc = usb_submit_urb(urb, GFP_KERNEL);
1138 if (unlikely(rc))
1139 return rc;
1140
1141 expire = (timeout ? msecs_to_jiffies(timeout) : MAX_SCHEDULE_TIMEOUT);
1142 rc = wait_for_completion_killable_timeout(&ctx, expire);
1143 if (rc <= 0) {
1144 usb_kill_urb(urb);
1145 *actlen = urb->actual_length;
1146 if (urb->status != -ENOENT)
1147 ; /* Completed before it was killed */
1148 else if (rc < 0)
1149 return -EINTR;
1150 else
1151 return -ETIMEDOUT;
1152 }
1153 *actlen = urb->actual_length;
1154 return urb->status;
1155}
1156
1157static int do_proc_control(struct usb_dev_state *ps,
1158 struct usbdevfs_ctrltransfer *ctrl)
1159{
1160 struct usb_device *dev = ps->dev;
1161 unsigned int tmo;
1162 unsigned char *tbuf;
1163 unsigned int wLength, actlen;
1164 int i, pipe, ret;
1165 struct urb *urb = NULL;
1166 struct usb_ctrlrequest *dr = NULL;
1167
1168 ret = check_ctrlrecip(ps, ctrl->bRequestType, ctrl->bRequest,
1169 ctrl->wIndex);
1170 if (ret)
1171 return ret;
1172 wLength = ctrl->wLength; /* To suppress 64k PAGE_SIZE warning */
1173 if (wLength > PAGE_SIZE)
1174 return -EINVAL;
1175 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1176 sizeof(struct usb_ctrlrequest));
1177 if (ret)
1178 return ret;
1179
1180 ret = -ENOMEM;
1181 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1182 if (!tbuf)
1183 goto done;
1184 urb = usb_alloc_urb(0, GFP_NOIO);
1185 if (!urb)
1186 goto done;
1187 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_NOIO);
1188 if (!dr)
1189 goto done;
1190
1191 dr->bRequestType = ctrl->bRequestType;
1192 dr->bRequest = ctrl->bRequest;
1193 dr->wValue = cpu_to_le16(ctrl->wValue);
1194 dr->wIndex = cpu_to_le16(ctrl->wIndex);
1195 dr->wLength = cpu_to_le16(ctrl->wLength);
1196
1197 tmo = ctrl->timeout;
1198 snoop(&dev->dev, "control urb: bRequestType=%02x "
1199 "bRequest=%02x wValue=%04x "
1200 "wIndex=%04x wLength=%04x\n",
1201 ctrl->bRequestType, ctrl->bRequest, ctrl->wValue,
1202 ctrl->wIndex, ctrl->wLength);
1203
1204 if ((ctrl->bRequestType & USB_DIR_IN) && wLength) {
1205 pipe = usb_rcvctrlpipe(dev, 0);
1206 usb_fill_control_urb(urb, dev, pipe, (unsigned char *) dr, tbuf,
1207 wLength, NULL, NULL);
1208 snoop_urb(dev, NULL, pipe, wLength, tmo, SUBMIT, NULL, 0);
1209
1210 usb_unlock_device(dev);
1211 i = usbfs_start_wait_urb(urb, tmo, &actlen);
1212
1213 /* Linger a bit, prior to the next control message. */
1214 if (dev->quirks & USB_QUIRK_DELAY_CTRL_MSG)
1215 msleep(200);
1216 usb_lock_device(dev);
1217 snoop_urb(dev, NULL, pipe, actlen, i, COMPLETE, tbuf, actlen);
1218 if (!i && actlen) {
1219 if (copy_to_user(ctrl->data, tbuf, actlen)) {
1220 ret = -EFAULT;
1221 goto done;
1222 }
1223 }
1224 } else {
1225 if (wLength) {
1226 if (copy_from_user(tbuf, ctrl->data, wLength)) {
1227 ret = -EFAULT;
1228 goto done;
1229 }
1230 }
1231 pipe = usb_sndctrlpipe(dev, 0);
1232 usb_fill_control_urb(urb, dev, pipe, (unsigned char *) dr, tbuf,
1233 wLength, NULL, NULL);
1234 snoop_urb(dev, NULL, pipe, wLength, tmo, SUBMIT, tbuf, wLength);
1235
1236 usb_unlock_device(dev);
1237 i = usbfs_start_wait_urb(urb, tmo, &actlen);
1238
1239 /* Linger a bit, prior to the next control message. */
1240 if (dev->quirks & USB_QUIRK_DELAY_CTRL_MSG)
1241 msleep(200);
1242 usb_lock_device(dev);
1243 snoop_urb(dev, NULL, pipe, actlen, i, COMPLETE, NULL, 0);
1244 }
1245 if (i < 0 && i != -EPIPE) {
1246 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1247 "failed cmd %s rqt %u rq %u len %u ret %d\n",
1248 current->comm, ctrl->bRequestType, ctrl->bRequest,
1249 ctrl->wLength, i);
1250 }
1251 ret = (i < 0 ? i : actlen);
1252
1253 done:
1254 kfree(dr);
1255 usb_free_urb(urb);
1256 free_page((unsigned long) tbuf);
1257 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1258 sizeof(struct usb_ctrlrequest));
1259 return ret;
1260}
1261
1262static int proc_control(struct usb_dev_state *ps, void __user *arg)
1263{
1264 struct usbdevfs_ctrltransfer ctrl;
1265
1266 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1267 return -EFAULT;
1268 return do_proc_control(ps, &ctrl);
1269}
1270
1271static int do_proc_bulk(struct usb_dev_state *ps,
1272 struct usbdevfs_bulktransfer *bulk)
1273{
1274 struct usb_device *dev = ps->dev;
1275 unsigned int tmo, len1, len2, pipe;
1276 unsigned char *tbuf;
1277 int i, ret;
1278 struct urb *urb = NULL;
1279 struct usb_host_endpoint *ep;
1280
1281 ret = findintfep(ps->dev, bulk->ep);
1282 if (ret < 0)
1283 return ret;
1284 ret = checkintf(ps, ret);
1285 if (ret)
1286 return ret;
1287
1288 len1 = bulk->len;
1289 if (len1 < 0 || len1 >= (INT_MAX - sizeof(struct urb)))
1290 return -EINVAL;
1291
1292 if (bulk->ep & USB_DIR_IN)
1293 pipe = usb_rcvbulkpipe(dev, bulk->ep & 0x7f);
1294 else
1295 pipe = usb_sndbulkpipe(dev, bulk->ep & 0x7f);
1296 ep = usb_pipe_endpoint(dev, pipe);
1297 if (!ep || !usb_endpoint_maxp(&ep->desc))
1298 return -EINVAL;
1299 ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1300 if (ret)
1301 return ret;
1302
1303 /*
1304 * len1 can be almost arbitrarily large. Don't WARN if it's
1305 * too big, just fail the request.
1306 */
1307 ret = -ENOMEM;
1308 tbuf = kmalloc(len1, GFP_KERNEL | __GFP_NOWARN);
1309 if (!tbuf)
1310 goto done;
1311 urb = usb_alloc_urb(0, GFP_KERNEL);
1312 if (!urb)
1313 goto done;
1314
1315 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
1316 USB_ENDPOINT_XFER_INT) {
1317 pipe = (pipe & ~(3 << 30)) | (PIPE_INTERRUPT << 30);
1318 usb_fill_int_urb(urb, dev, pipe, tbuf, len1,
1319 NULL, NULL, ep->desc.bInterval);
1320 } else {
1321 usb_fill_bulk_urb(urb, dev, pipe, tbuf, len1, NULL, NULL);
1322 }
1323
1324 tmo = bulk->timeout;
1325 if (bulk->ep & 0x80) {
1326 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1327
1328 usb_unlock_device(dev);
1329 i = usbfs_start_wait_urb(urb, tmo, &len2);
1330 usb_lock_device(dev);
1331 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1332
1333 if (!i && len2) {
1334 if (copy_to_user(bulk->data, tbuf, len2)) {
1335 ret = -EFAULT;
1336 goto done;
1337 }
1338 }
1339 } else {
1340 if (len1) {
1341 if (copy_from_user(tbuf, bulk->data, len1)) {
1342 ret = -EFAULT;
1343 goto done;
1344 }
1345 }
1346 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1347
1348 usb_unlock_device(dev);
1349 i = usbfs_start_wait_urb(urb, tmo, &len2);
1350 usb_lock_device(dev);
1351 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1352 }
1353 ret = (i < 0 ? i : len2);
1354 done:
1355 usb_free_urb(urb);
1356 kfree(tbuf);
1357 usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1358 return ret;
1359}
1360
1361static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1362{
1363 struct usbdevfs_bulktransfer bulk;
1364
1365 if (copy_from_user(&bulk, arg, sizeof(bulk)))
1366 return -EFAULT;
1367 return do_proc_bulk(ps, &bulk);
1368}
1369
1370static void check_reset_of_active_ep(struct usb_device *udev,
1371 unsigned int epnum, char *ioctl_name)
1372{
1373 struct usb_host_endpoint **eps;
1374 struct usb_host_endpoint *ep;
1375
1376 eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1377 ep = eps[epnum & 0x0f];
1378 if (ep && !list_empty(&ep->urb_list))
1379 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1380 task_pid_nr(current), current->comm,
1381 ioctl_name, epnum);
1382}
1383
1384static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1385{
1386 unsigned int ep;
1387 int ret;
1388
1389 if (get_user(ep, (unsigned int __user *)arg))
1390 return -EFAULT;
1391 ret = findintfep(ps->dev, ep);
1392 if (ret < 0)
1393 return ret;
1394 ret = checkintf(ps, ret);
1395 if (ret)
1396 return ret;
1397 check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1398 usb_reset_endpoint(ps->dev, ep);
1399 return 0;
1400}
1401
1402static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1403{
1404 unsigned int ep;
1405 int pipe;
1406 int ret;
1407
1408 if (get_user(ep, (unsigned int __user *)arg))
1409 return -EFAULT;
1410 ret = findintfep(ps->dev, ep);
1411 if (ret < 0)
1412 return ret;
1413 ret = checkintf(ps, ret);
1414 if (ret)
1415 return ret;
1416 check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1417 if (ep & USB_DIR_IN)
1418 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1419 else
1420 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1421
1422 return usb_clear_halt(ps->dev, pipe);
1423}
1424
1425static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1426{
1427 struct usbdevfs_getdriver gd;
1428 struct usb_interface *intf;
1429 int ret;
1430
1431 if (copy_from_user(&gd, arg, sizeof(gd)))
1432 return -EFAULT;
1433 intf = usb_ifnum_to_if(ps->dev, gd.interface);
1434 if (!intf || !intf->dev.driver)
1435 ret = -ENODATA;
1436 else {
1437 strscpy(gd.driver, intf->dev.driver->name,
1438 sizeof(gd.driver));
1439 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1440 }
1441 return ret;
1442}
1443
1444static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1445{
1446 struct usbdevfs_connectinfo ci;
1447
1448 memset(&ci, 0, sizeof(ci));
1449 ci.devnum = ps->dev->devnum;
1450 ci.slow = ps->dev->speed == USB_SPEED_LOW;
1451
1452 if (copy_to_user(arg, &ci, sizeof(ci)))
1453 return -EFAULT;
1454 return 0;
1455}
1456
1457static int proc_conninfo_ex(struct usb_dev_state *ps,
1458 void __user *arg, size_t size)
1459{
1460 struct usbdevfs_conninfo_ex ci;
1461 struct usb_device *udev = ps->dev;
1462
1463 if (size < sizeof(ci.size))
1464 return -EINVAL;
1465
1466 memset(&ci, 0, sizeof(ci));
1467 ci.size = sizeof(ci);
1468 ci.busnum = udev->bus->busnum;
1469 ci.devnum = udev->devnum;
1470 ci.speed = udev->speed;
1471
1472 while (udev && udev->portnum != 0) {
1473 if (++ci.num_ports <= ARRAY_SIZE(ci.ports))
1474 ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports] =
1475 udev->portnum;
1476 udev = udev->parent;
1477 }
1478
1479 if (ci.num_ports < ARRAY_SIZE(ci.ports))
1480 memmove(&ci.ports[0],
1481 &ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports],
1482 ci.num_ports);
1483
1484 if (copy_to_user(arg, &ci, min(sizeof(ci), size)))
1485 return -EFAULT;
1486
1487 return 0;
1488}
1489
1490static int proc_resetdevice(struct usb_dev_state *ps)
1491{
1492 struct usb_host_config *actconfig = ps->dev->actconfig;
1493 struct usb_interface *interface;
1494 int i, number;
1495
1496 /* Don't allow a device reset if the process has dropped the
1497 * privilege to do such things and any of the interfaces are
1498 * currently claimed.
1499 */
1500 if (ps->privileges_dropped && actconfig) {
1501 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1502 interface = actconfig->interface[i];
1503 number = interface->cur_altsetting->desc.bInterfaceNumber;
1504 if (usb_interface_claimed(interface) &&
1505 !test_bit(number, &ps->ifclaimed)) {
1506 dev_warn(&ps->dev->dev,
1507 "usbfs: interface %d claimed by %s while '%s' resets device\n",
1508 number, interface->dev.driver->name, current->comm);
1509 return -EACCES;
1510 }
1511 }
1512 }
1513
1514 return usb_reset_device(ps->dev);
1515}
1516
1517static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1518{
1519 struct usbdevfs_setinterface setintf;
1520 int ret;
1521
1522 if (copy_from_user(&setintf, arg, sizeof(setintf)))
1523 return -EFAULT;
1524 ret = checkintf(ps, setintf.interface);
1525 if (ret)
1526 return ret;
1527
1528 destroy_async_on_interface(ps, setintf.interface);
1529
1530 return usb_set_interface(ps->dev, setintf.interface,
1531 setintf.altsetting);
1532}
1533
1534static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1535{
1536 int u;
1537 int status = 0;
1538 struct usb_host_config *actconfig;
1539
1540 if (get_user(u, (int __user *)arg))
1541 return -EFAULT;
1542
1543 actconfig = ps->dev->actconfig;
1544
1545 /* Don't touch the device if any interfaces are claimed.
1546 * It could interfere with other drivers' operations, and if
1547 * an interface is claimed by usbfs it could easily deadlock.
1548 */
1549 if (actconfig) {
1550 int i;
1551
1552 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1553 if (usb_interface_claimed(actconfig->interface[i])) {
1554 dev_warn(&ps->dev->dev,
1555 "usbfs: interface %d claimed by %s "
1556 "while '%s' sets config #%d\n",
1557 actconfig->interface[i]
1558 ->cur_altsetting
1559 ->desc.bInterfaceNumber,
1560 actconfig->interface[i]
1561 ->dev.driver->name,
1562 current->comm, u);
1563 status = -EBUSY;
1564 break;
1565 }
1566 }
1567 }
1568
1569 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1570 * so avoid usb_set_configuration()'s kick to sysfs
1571 */
1572 if (status == 0) {
1573 if (actconfig && actconfig->desc.bConfigurationValue == u)
1574 status = usb_reset_configuration(ps->dev);
1575 else
1576 status = usb_set_configuration(ps->dev, u);
1577 }
1578
1579 return status;
1580}
1581
1582static struct usb_memory *
1583find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
1584{
1585 struct usb_memory *usbm = NULL, *iter;
1586 unsigned long flags;
1587 unsigned long uurb_start = (unsigned long)uurb->buffer;
1588
1589 spin_lock_irqsave(&ps->lock, flags);
1590 list_for_each_entry(iter, &ps->memory_list, memlist) {
1591 if (uurb_start >= iter->vm_start &&
1592 uurb_start < iter->vm_start + iter->size) {
1593 if (uurb->buffer_length > iter->vm_start + iter->size -
1594 uurb_start) {
1595 usbm = ERR_PTR(-EINVAL);
1596 } else {
1597 usbm = iter;
1598 usbm->urb_use_count++;
1599 }
1600 break;
1601 }
1602 }
1603 spin_unlock_irqrestore(&ps->lock, flags);
1604 return usbm;
1605}
1606
1607static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1608 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1609 void __user *arg, sigval_t userurb_sigval)
1610{
1611 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1612 struct usb_host_endpoint *ep;
1613 struct async *as = NULL;
1614 struct usb_ctrlrequest *dr = NULL;
1615 unsigned int u, totlen, isofrmlen;
1616 int i, ret, num_sgs = 0, ifnum = -1;
1617 int number_of_packets = 0;
1618 unsigned int stream_id = 0;
1619 void *buf;
1620 bool is_in;
1621 bool allow_short = false;
1622 bool allow_zero = false;
1623 unsigned long mask = USBDEVFS_URB_SHORT_NOT_OK |
1624 USBDEVFS_URB_BULK_CONTINUATION |
1625 USBDEVFS_URB_NO_FSBR |
1626 USBDEVFS_URB_ZERO_PACKET |
1627 USBDEVFS_URB_NO_INTERRUPT;
1628 /* USBDEVFS_URB_ISO_ASAP is a special case */
1629 if (uurb->type == USBDEVFS_URB_TYPE_ISO)
1630 mask |= USBDEVFS_URB_ISO_ASAP;
1631
1632 if (uurb->flags & ~mask)
1633 return -EINVAL;
1634
1635 if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
1636 return -EINVAL;
1637 if (uurb->buffer_length > 0 && !uurb->buffer)
1638 return -EINVAL;
1639 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1640 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1641 ifnum = findintfep(ps->dev, uurb->endpoint);
1642 if (ifnum < 0)
1643 return ifnum;
1644 ret = checkintf(ps, ifnum);
1645 if (ret)
1646 return ret;
1647 }
1648 ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1649 if (!ep)
1650 return -ENOENT;
1651 is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1652
1653 u = 0;
1654 switch (uurb->type) {
1655 case USBDEVFS_URB_TYPE_CONTROL:
1656 if (!usb_endpoint_xfer_control(&ep->desc))
1657 return -EINVAL;
1658 /* min 8 byte setup packet */
1659 if (uurb->buffer_length < 8)
1660 return -EINVAL;
1661 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1662 if (!dr)
1663 return -ENOMEM;
1664 if (copy_from_user(dr, uurb->buffer, 8)) {
1665 ret = -EFAULT;
1666 goto error;
1667 }
1668 if (uurb->buffer_length < (le16_to_cpu(dr->wLength) + 8)) {
1669 ret = -EINVAL;
1670 goto error;
1671 }
1672 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1673 le16_to_cpu(dr->wIndex));
1674 if (ret)
1675 goto error;
1676 uurb->buffer_length = le16_to_cpu(dr->wLength);
1677 uurb->buffer += 8;
1678 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1679 is_in = true;
1680 uurb->endpoint |= USB_DIR_IN;
1681 } else {
1682 is_in = false;
1683 uurb->endpoint &= ~USB_DIR_IN;
1684 }
1685 if (is_in)
1686 allow_short = true;
1687 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1688 "bRequest=%02x wValue=%04x "
1689 "wIndex=%04x wLength=%04x\n",
1690 dr->bRequestType, dr->bRequest,
1691 __le16_to_cpu(dr->wValue),
1692 __le16_to_cpu(dr->wIndex),
1693 __le16_to_cpu(dr->wLength));
1694 u = sizeof(struct usb_ctrlrequest);
1695 break;
1696
1697 case USBDEVFS_URB_TYPE_BULK:
1698 if (!is_in)
1699 allow_zero = true;
1700 else
1701 allow_short = true;
1702 switch (usb_endpoint_type(&ep->desc)) {
1703 case USB_ENDPOINT_XFER_CONTROL:
1704 case USB_ENDPOINT_XFER_ISOC:
1705 return -EINVAL;
1706 case USB_ENDPOINT_XFER_INT:
1707 /* allow single-shot interrupt transfers */
1708 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1709 goto interrupt_urb;
1710 }
1711 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1712 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1713 num_sgs = 0;
1714 if (ep->streams)
1715 stream_id = uurb->stream_id;
1716 break;
1717
1718 case USBDEVFS_URB_TYPE_INTERRUPT:
1719 if (!usb_endpoint_xfer_int(&ep->desc))
1720 return -EINVAL;
1721 interrupt_urb:
1722 if (!is_in)
1723 allow_zero = true;
1724 else
1725 allow_short = true;
1726 break;
1727
1728 case USBDEVFS_URB_TYPE_ISO:
1729 /* arbitrary limit */
1730 if (uurb->number_of_packets < 1 ||
1731 uurb->number_of_packets > 128)
1732 return -EINVAL;
1733 if (!usb_endpoint_xfer_isoc(&ep->desc))
1734 return -EINVAL;
1735 number_of_packets = uurb->number_of_packets;
1736 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1737 number_of_packets;
1738 isopkt = memdup_user(iso_frame_desc, isofrmlen);
1739 if (IS_ERR(isopkt)) {
1740 ret = PTR_ERR(isopkt);
1741 isopkt = NULL;
1742 goto error;
1743 }
1744 for (totlen = u = 0; u < number_of_packets; u++) {
1745 /*
1746 * arbitrary limit need for USB 3.1 Gen2
1747 * sizemax: 96 DPs at SSP, 96 * 1024 = 98304
1748 */
1749 if (isopkt[u].length > 98304) {
1750 ret = -EINVAL;
1751 goto error;
1752 }
1753 totlen += isopkt[u].length;
1754 }
1755 u *= sizeof(struct usb_iso_packet_descriptor);
1756 uurb->buffer_length = totlen;
1757 break;
1758
1759 default:
1760 return -EINVAL;
1761 }
1762
1763 if (uurb->buffer_length > 0 &&
1764 !access_ok(uurb->buffer, uurb->buffer_length)) {
1765 ret = -EFAULT;
1766 goto error;
1767 }
1768 as = alloc_async(number_of_packets);
1769 if (!as) {
1770 ret = -ENOMEM;
1771 goto error;
1772 }
1773
1774 as->usbm = find_memory_area(ps, uurb);
1775 if (IS_ERR(as->usbm)) {
1776 ret = PTR_ERR(as->usbm);
1777 as->usbm = NULL;
1778 goto error;
1779 }
1780
1781 /* do not use SG buffers when memory mapped segments
1782 * are in use
1783 */
1784 if (as->usbm)
1785 num_sgs = 0;
1786
1787 u += sizeof(struct async) + sizeof(struct urb) +
1788 (as->usbm ? 0 : uurb->buffer_length) +
1789 num_sgs * sizeof(struct scatterlist);
1790 ret = usbfs_increase_memory_usage(u);
1791 if (ret)
1792 goto error;
1793 as->mem_usage = u;
1794
1795 if (num_sgs) {
1796 as->urb->sg = kmalloc_array(num_sgs,
1797 sizeof(struct scatterlist),
1798 GFP_KERNEL | __GFP_NOWARN);
1799 if (!as->urb->sg) {
1800 ret = -ENOMEM;
1801 goto error;
1802 }
1803 as->urb->num_sgs = num_sgs;
1804 sg_init_table(as->urb->sg, as->urb->num_sgs);
1805
1806 totlen = uurb->buffer_length;
1807 for (i = 0; i < as->urb->num_sgs; i++) {
1808 u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1809 buf = kmalloc(u, GFP_KERNEL);
1810 if (!buf) {
1811 ret = -ENOMEM;
1812 goto error;
1813 }
1814 sg_set_buf(&as->urb->sg[i], buf, u);
1815
1816 if (!is_in) {
1817 if (copy_from_user(buf, uurb->buffer, u)) {
1818 ret = -EFAULT;
1819 goto error;
1820 }
1821 uurb->buffer += u;
1822 }
1823 totlen -= u;
1824 }
1825 } else if (uurb->buffer_length > 0) {
1826 if (as->usbm) {
1827 unsigned long uurb_start = (unsigned long)uurb->buffer;
1828
1829 as->urb->transfer_buffer = as->usbm->mem +
1830 (uurb_start - as->usbm->vm_start);
1831 } else {
1832 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1833 GFP_KERNEL | __GFP_NOWARN);
1834 if (!as->urb->transfer_buffer) {
1835 ret = -ENOMEM;
1836 goto error;
1837 }
1838 if (!is_in) {
1839 if (copy_from_user(as->urb->transfer_buffer,
1840 uurb->buffer,
1841 uurb->buffer_length)) {
1842 ret = -EFAULT;
1843 goto error;
1844 }
1845 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1846 /*
1847 * Isochronous input data may end up being
1848 * discontiguous if some of the packets are
1849 * short. Clear the buffer so that the gaps
1850 * don't leak kernel data to userspace.
1851 */
1852 memset(as->urb->transfer_buffer, 0,
1853 uurb->buffer_length);
1854 }
1855 }
1856 }
1857 as->urb->dev = ps->dev;
1858 as->urb->pipe = (uurb->type << 30) |
1859 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1860 (uurb->endpoint & USB_DIR_IN);
1861
1862 /* This tedious sequence is necessary because the URB_* flags
1863 * are internal to the kernel and subject to change, whereas
1864 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1865 */
1866 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1867 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1868 u |= URB_ISO_ASAP;
1869 if (allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1870 u |= URB_SHORT_NOT_OK;
1871 if (allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1872 u |= URB_ZERO_PACKET;
1873 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1874 u |= URB_NO_INTERRUPT;
1875 as->urb->transfer_flags = u;
1876
1877 if (!allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1878 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_SHORT_NOT_OK.\n");
1879 if (!allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1880 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_ZERO_PACKET.\n");
1881
1882 as->urb->transfer_buffer_length = uurb->buffer_length;
1883 as->urb->setup_packet = (unsigned char *)dr;
1884 dr = NULL;
1885 as->urb->start_frame = uurb->start_frame;
1886 as->urb->number_of_packets = number_of_packets;
1887 as->urb->stream_id = stream_id;
1888
1889 if (ep->desc.bInterval) {
1890 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1891 ps->dev->speed == USB_SPEED_HIGH ||
1892 ps->dev->speed >= USB_SPEED_SUPER)
1893 as->urb->interval = 1 <<
1894 min(15, ep->desc.bInterval - 1);
1895 else
1896 as->urb->interval = ep->desc.bInterval;
1897 }
1898
1899 as->urb->context = as;
1900 as->urb->complete = async_completed;
1901 for (totlen = u = 0; u < number_of_packets; u++) {
1902 as->urb->iso_frame_desc[u].offset = totlen;
1903 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1904 totlen += isopkt[u].length;
1905 }
1906 kfree(isopkt);
1907 isopkt = NULL;
1908 as->ps = ps;
1909 as->userurb = arg;
1910 as->userurb_sigval = userurb_sigval;
1911 if (as->usbm) {
1912 unsigned long uurb_start = (unsigned long)uurb->buffer;
1913
1914 as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1915 as->urb->transfer_dma = as->usbm->dma_handle +
1916 (uurb_start - as->usbm->vm_start);
1917 } else if (is_in && uurb->buffer_length > 0)
1918 as->userbuffer = uurb->buffer;
1919 as->signr = uurb->signr;
1920 as->ifnum = ifnum;
1921 as->pid = get_pid(task_pid(current));
1922 as->cred = get_current_cred();
1923 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1924 as->urb->transfer_buffer_length, 0, SUBMIT,
1925 NULL, 0);
1926 if (!is_in)
1927 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1928
1929 async_newpending(as);
1930
1931 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1932 spin_lock_irq(&ps->lock);
1933
1934 /* Not exactly the endpoint address; the direction bit is
1935 * shifted to the 0x10 position so that the value will be
1936 * between 0 and 31.
1937 */
1938 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1939 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1940 >> 3);
1941
1942 /* If this bulk URB is the start of a new transfer, re-enable
1943 * the endpoint. Otherwise mark it as a continuation URB.
1944 */
1945 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1946 as->bulk_status = AS_CONTINUATION;
1947 else
1948 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1949
1950 /* Don't accept continuation URBs if the endpoint is
1951 * disabled because of an earlier error.
1952 */
1953 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1954 ret = -EREMOTEIO;
1955 else
1956 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1957 spin_unlock_irq(&ps->lock);
1958 } else {
1959 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1960 }
1961
1962 if (ret) {
1963 dev_printk(KERN_DEBUG, &ps->dev->dev,
1964 "usbfs: usb_submit_urb returned %d\n", ret);
1965 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1966 0, ret, COMPLETE, NULL, 0);
1967 async_removepending(as);
1968 goto error;
1969 }
1970 return 0;
1971
1972 error:
1973 kfree(isopkt);
1974 kfree(dr);
1975 if (as)
1976 free_async(as);
1977 return ret;
1978}
1979
1980static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1981{
1982 struct usbdevfs_urb uurb;
1983 sigval_t userurb_sigval;
1984
1985 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1986 return -EFAULT;
1987
1988 memset(&userurb_sigval, 0, sizeof(userurb_sigval));
1989 userurb_sigval.sival_ptr = arg;
1990
1991 return proc_do_submiturb(ps, &uurb,
1992 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1993 arg, userurb_sigval);
1994}
1995
1996static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1997{
1998 struct urb *urb;
1999 struct async *as;
2000 unsigned long flags;
2001
2002 spin_lock_irqsave(&ps->lock, flags);
2003 as = async_getpending(ps, arg);
2004 if (!as) {
2005 spin_unlock_irqrestore(&ps->lock, flags);
2006 return -EINVAL;
2007 }
2008
2009 urb = as->urb;
2010 usb_get_urb(urb);
2011 spin_unlock_irqrestore(&ps->lock, flags);
2012
2013 usb_kill_urb(urb);
2014 usb_put_urb(urb);
2015
2016 return 0;
2017}
2018
2019static void compute_isochronous_actual_length(struct urb *urb)
2020{
2021 unsigned int i;
2022
2023 if (urb->number_of_packets > 0) {
2024 urb->actual_length = 0;
2025 for (i = 0; i < urb->number_of_packets; i++)
2026 urb->actual_length +=
2027 urb->iso_frame_desc[i].actual_length;
2028 }
2029}
2030
2031static int processcompl(struct async *as, void __user * __user *arg)
2032{
2033 struct urb *urb = as->urb;
2034 struct usbdevfs_urb __user *userurb = as->userurb;
2035 void __user *addr = as->userurb;
2036 unsigned int i;
2037
2038 compute_isochronous_actual_length(urb);
2039 if (as->userbuffer && urb->actual_length) {
2040 if (copy_urb_data_to_user(as->userbuffer, urb))
2041 goto err_out;
2042 }
2043 if (put_user(as->status, &userurb->status))
2044 goto err_out;
2045 if (put_user(urb->actual_length, &userurb->actual_length))
2046 goto err_out;
2047 if (put_user(urb->error_count, &userurb->error_count))
2048 goto err_out;
2049
2050 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2051 for (i = 0; i < urb->number_of_packets; i++) {
2052 if (put_user(urb->iso_frame_desc[i].actual_length,
2053 &userurb->iso_frame_desc[i].actual_length))
2054 goto err_out;
2055 if (put_user(urb->iso_frame_desc[i].status,
2056 &userurb->iso_frame_desc[i].status))
2057 goto err_out;
2058 }
2059 }
2060
2061 if (put_user(addr, (void __user * __user *)arg))
2062 return -EFAULT;
2063 return 0;
2064
2065err_out:
2066 return -EFAULT;
2067}
2068
2069static struct async *reap_as(struct usb_dev_state *ps)
2070{
2071 DECLARE_WAITQUEUE(wait, current);
2072 struct async *as = NULL;
2073 struct usb_device *dev = ps->dev;
2074
2075 add_wait_queue(&ps->wait, &wait);
2076 for (;;) {
2077 __set_current_state(TASK_INTERRUPTIBLE);
2078 as = async_getcompleted(ps);
2079 if (as || !connected(ps))
2080 break;
2081 if (signal_pending(current))
2082 break;
2083 usb_unlock_device(dev);
2084 schedule();
2085 usb_lock_device(dev);
2086 }
2087 remove_wait_queue(&ps->wait, &wait);
2088 set_current_state(TASK_RUNNING);
2089 return as;
2090}
2091
2092static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
2093{
2094 struct async *as = reap_as(ps);
2095
2096 if (as) {
2097 int retval;
2098
2099 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2100 retval = processcompl(as, (void __user * __user *)arg);
2101 free_async(as);
2102 return retval;
2103 }
2104 if (signal_pending(current))
2105 return -EINTR;
2106 return -ENODEV;
2107}
2108
2109static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
2110{
2111 int retval;
2112 struct async *as;
2113
2114 as = async_getcompleted(ps);
2115 if (as) {
2116 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2117 retval = processcompl(as, (void __user * __user *)arg);
2118 free_async(as);
2119 } else {
2120 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2121 }
2122 return retval;
2123}
2124
2125#ifdef CONFIG_COMPAT
2126static int proc_control_compat(struct usb_dev_state *ps,
2127 struct usbdevfs_ctrltransfer32 __user *p32)
2128{
2129 struct usbdevfs_ctrltransfer ctrl;
2130 u32 udata;
2131
2132 if (copy_from_user(&ctrl, p32, sizeof(*p32) - sizeof(compat_caddr_t)) ||
2133 get_user(udata, &p32->data))
2134 return -EFAULT;
2135 ctrl.data = compat_ptr(udata);
2136 return do_proc_control(ps, &ctrl);
2137}
2138
2139static int proc_bulk_compat(struct usb_dev_state *ps,
2140 struct usbdevfs_bulktransfer32 __user *p32)
2141{
2142 struct usbdevfs_bulktransfer bulk;
2143 compat_caddr_t addr;
2144
2145 if (get_user(bulk.ep, &p32->ep) ||
2146 get_user(bulk.len, &p32->len) ||
2147 get_user(bulk.timeout, &p32->timeout) ||
2148 get_user(addr, &p32->data))
2149 return -EFAULT;
2150 bulk.data = compat_ptr(addr);
2151 return do_proc_bulk(ps, &bulk);
2152}
2153
2154static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
2155{
2156 struct usbdevfs_disconnectsignal32 ds;
2157
2158 if (copy_from_user(&ds, arg, sizeof(ds)))
2159 return -EFAULT;
2160 ps->discsignr = ds.signr;
2161 ps->disccontext.sival_int = ds.context;
2162 return 0;
2163}
2164
2165static int get_urb32(struct usbdevfs_urb *kurb,
2166 struct usbdevfs_urb32 __user *uurb)
2167{
2168 struct usbdevfs_urb32 urb32;
2169 if (copy_from_user(&urb32, uurb, sizeof(*uurb)))
2170 return -EFAULT;
2171 kurb->type = urb32.type;
2172 kurb->endpoint = urb32.endpoint;
2173 kurb->status = urb32.status;
2174 kurb->flags = urb32.flags;
2175 kurb->buffer = compat_ptr(urb32.buffer);
2176 kurb->buffer_length = urb32.buffer_length;
2177 kurb->actual_length = urb32.actual_length;
2178 kurb->start_frame = urb32.start_frame;
2179 kurb->number_of_packets = urb32.number_of_packets;
2180 kurb->error_count = urb32.error_count;
2181 kurb->signr = urb32.signr;
2182 kurb->usercontext = compat_ptr(urb32.usercontext);
2183 return 0;
2184}
2185
2186static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
2187{
2188 struct usbdevfs_urb uurb;
2189 sigval_t userurb_sigval;
2190
2191 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
2192 return -EFAULT;
2193
2194 memset(&userurb_sigval, 0, sizeof(userurb_sigval));
2195 userurb_sigval.sival_int = ptr_to_compat(arg);
2196
2197 return proc_do_submiturb(ps, &uurb,
2198 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
2199 arg, userurb_sigval);
2200}
2201
2202static int processcompl_compat(struct async *as, void __user * __user *arg)
2203{
2204 struct urb *urb = as->urb;
2205 struct usbdevfs_urb32 __user *userurb = as->userurb;
2206 void __user *addr = as->userurb;
2207 unsigned int i;
2208
2209 compute_isochronous_actual_length(urb);
2210 if (as->userbuffer && urb->actual_length) {
2211 if (copy_urb_data_to_user(as->userbuffer, urb))
2212 return -EFAULT;
2213 }
2214 if (put_user(as->status, &userurb->status))
2215 return -EFAULT;
2216 if (put_user(urb->actual_length, &userurb->actual_length))
2217 return -EFAULT;
2218 if (put_user(urb->error_count, &userurb->error_count))
2219 return -EFAULT;
2220
2221 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2222 for (i = 0; i < urb->number_of_packets; i++) {
2223 if (put_user(urb->iso_frame_desc[i].actual_length,
2224 &userurb->iso_frame_desc[i].actual_length))
2225 return -EFAULT;
2226 if (put_user(urb->iso_frame_desc[i].status,
2227 &userurb->iso_frame_desc[i].status))
2228 return -EFAULT;
2229 }
2230 }
2231
2232 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2233 return -EFAULT;
2234 return 0;
2235}
2236
2237static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
2238{
2239 struct async *as = reap_as(ps);
2240
2241 if (as) {
2242 int retval;
2243
2244 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2245 retval = processcompl_compat(as, (void __user * __user *)arg);
2246 free_async(as);
2247 return retval;
2248 }
2249 if (signal_pending(current))
2250 return -EINTR;
2251 return -ENODEV;
2252}
2253
2254static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
2255{
2256 int retval;
2257 struct async *as;
2258
2259 as = async_getcompleted(ps);
2260 if (as) {
2261 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2262 retval = processcompl_compat(as, (void __user * __user *)arg);
2263 free_async(as);
2264 } else {
2265 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2266 }
2267 return retval;
2268}
2269
2270
2271#endif
2272
2273static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
2274{
2275 struct usbdevfs_disconnectsignal ds;
2276
2277 if (copy_from_user(&ds, arg, sizeof(ds)))
2278 return -EFAULT;
2279 ps->discsignr = ds.signr;
2280 ps->disccontext.sival_ptr = ds.context;
2281 return 0;
2282}
2283
2284static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
2285{
2286 unsigned int ifnum;
2287
2288 if (get_user(ifnum, (unsigned int __user *)arg))
2289 return -EFAULT;
2290 return claimintf(ps, ifnum);
2291}
2292
2293static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
2294{
2295 unsigned int ifnum;
2296 int ret;
2297
2298 if (get_user(ifnum, (unsigned int __user *)arg))
2299 return -EFAULT;
2300 ret = releaseintf(ps, ifnum);
2301 if (ret < 0)
2302 return ret;
2303 destroy_async_on_interface(ps, ifnum);
2304 return 0;
2305}
2306
2307static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
2308{
2309 int size;
2310 void *buf = NULL;
2311 int retval = 0;
2312 struct usb_interface *intf = NULL;
2313 struct usb_driver *driver = NULL;
2314
2315 if (ps->privileges_dropped)
2316 return -EACCES;
2317
2318 if (!connected(ps))
2319 return -ENODEV;
2320
2321 /* alloc buffer */
2322 size = _IOC_SIZE(ctl->ioctl_code);
2323 if (size > 0) {
2324 buf = kmalloc(size, GFP_KERNEL);
2325 if (buf == NULL)
2326 return -ENOMEM;
2327 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2328 if (copy_from_user(buf, ctl->data, size)) {
2329 kfree(buf);
2330 return -EFAULT;
2331 }
2332 } else {
2333 memset(buf, 0, size);
2334 }
2335 }
2336
2337 if (ps->dev->state != USB_STATE_CONFIGURED)
2338 retval = -EHOSTUNREACH;
2339 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
2340 retval = -EINVAL;
2341 else switch (ctl->ioctl_code) {
2342
2343 /* disconnect kernel driver from interface */
2344 case USBDEVFS_DISCONNECT:
2345 if (intf->dev.driver) {
2346 driver = to_usb_driver(intf->dev.driver);
2347 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2348 usb_driver_release_interface(driver, intf);
2349 } else
2350 retval = -ENODATA;
2351 break;
2352
2353 /* let kernel drivers try to (re)bind to the interface */
2354 case USBDEVFS_CONNECT:
2355 if (!intf->dev.driver)
2356 retval = device_attach(&intf->dev);
2357 else
2358 retval = -EBUSY;
2359 break;
2360
2361 /* talk directly to the interface's driver */
2362 default:
2363 if (intf->dev.driver)
2364 driver = to_usb_driver(intf->dev.driver);
2365 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2366 retval = -ENOTTY;
2367 } else {
2368 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2369 if (retval == -ENOIOCTLCMD)
2370 retval = -ENOTTY;
2371 }
2372 }
2373
2374 /* cleanup and return */
2375 if (retval >= 0
2376 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2377 && size > 0
2378 && copy_to_user(ctl->data, buf, size) != 0)
2379 retval = -EFAULT;
2380
2381 kfree(buf);
2382 return retval;
2383}
2384
2385static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2386{
2387 struct usbdevfs_ioctl ctrl;
2388
2389 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2390 return -EFAULT;
2391 return proc_ioctl(ps, &ctrl);
2392}
2393
2394#ifdef CONFIG_COMPAT
2395static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2396{
2397 struct usbdevfs_ioctl32 ioc32;
2398 struct usbdevfs_ioctl ctrl;
2399
2400 if (copy_from_user(&ioc32, compat_ptr(arg), sizeof(ioc32)))
2401 return -EFAULT;
2402 ctrl.ifno = ioc32.ifno;
2403 ctrl.ioctl_code = ioc32.ioctl_code;
2404 ctrl.data = compat_ptr(ioc32.data);
2405 return proc_ioctl(ps, &ctrl);
2406}
2407#endif
2408
2409static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2410{
2411 unsigned portnum;
2412 int rc;
2413
2414 if (get_user(portnum, (unsigned __user *) arg))
2415 return -EFAULT;
2416 rc = usb_hub_claim_port(ps->dev, portnum, ps);
2417 if (rc == 0)
2418 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2419 portnum, task_pid_nr(current), current->comm);
2420 return rc;
2421}
2422
2423static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2424{
2425 unsigned portnum;
2426
2427 if (get_user(portnum, (unsigned __user *) arg))
2428 return -EFAULT;
2429 return usb_hub_release_port(ps->dev, portnum, ps);
2430}
2431
2432static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2433{
2434 __u32 caps;
2435
2436 caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2437 USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
2438 USBDEVFS_CAP_DROP_PRIVILEGES |
2439 USBDEVFS_CAP_CONNINFO_EX | MAYBE_CAP_SUSPEND;
2440 if (!ps->dev->bus->no_stop_on_short)
2441 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2442 if (ps->dev->bus->sg_tablesize)
2443 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2444
2445 if (put_user(caps, (__u32 __user *)arg))
2446 return -EFAULT;
2447
2448 return 0;
2449}
2450
2451static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2452{
2453 struct usbdevfs_disconnect_claim dc;
2454 struct usb_interface *intf;
2455
2456 if (copy_from_user(&dc, arg, sizeof(dc)))
2457 return -EFAULT;
2458
2459 intf = usb_ifnum_to_if(ps->dev, dc.interface);
2460 if (!intf)
2461 return -EINVAL;
2462
2463 if (intf->dev.driver) {
2464 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2465
2466 if (ps->privileges_dropped)
2467 return -EACCES;
2468
2469 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2470 strncmp(dc.driver, intf->dev.driver->name,
2471 sizeof(dc.driver)) != 0)
2472 return -EBUSY;
2473
2474 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2475 strncmp(dc.driver, intf->dev.driver->name,
2476 sizeof(dc.driver)) == 0)
2477 return -EBUSY;
2478
2479 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2480 usb_driver_release_interface(driver, intf);
2481 }
2482
2483 return claimintf(ps, dc.interface);
2484}
2485
2486static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2487{
2488 unsigned num_streams, num_eps;
2489 struct usb_host_endpoint **eps;
2490 struct usb_interface *intf;
2491 int r;
2492
2493 r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2494 &eps, &intf);
2495 if (r)
2496 return r;
2497
2498 destroy_async_on_interface(ps,
2499 intf->altsetting[0].desc.bInterfaceNumber);
2500
2501 r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2502 kfree(eps);
2503 return r;
2504}
2505
2506static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2507{
2508 unsigned num_eps;
2509 struct usb_host_endpoint **eps;
2510 struct usb_interface *intf;
2511 int r;
2512
2513 r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2514 if (r)
2515 return r;
2516
2517 destroy_async_on_interface(ps,
2518 intf->altsetting[0].desc.bInterfaceNumber);
2519
2520 r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2521 kfree(eps);
2522 return r;
2523}
2524
2525static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
2526{
2527 u32 data;
2528
2529 if (copy_from_user(&data, arg, sizeof(data)))
2530 return -EFAULT;
2531
2532 /* This is a one way operation. Once privileges are
2533 * dropped, you cannot regain them. You may however reissue
2534 * this ioctl to shrink the allowed interfaces mask.
2535 */
2536 ps->interface_allowed_mask &= data;
2537 ps->privileges_dropped = true;
2538
2539 return 0;
2540}
2541
2542static int proc_forbid_suspend(struct usb_dev_state *ps)
2543{
2544 int ret = 0;
2545
2546 if (ps->suspend_allowed) {
2547 ret = usb_autoresume_device(ps->dev);
2548 if (ret == 0)
2549 ps->suspend_allowed = false;
2550 else if (ret != -ENODEV)
2551 ret = -EIO;
2552 }
2553 return ret;
2554}
2555
2556static int proc_allow_suspend(struct usb_dev_state *ps)
2557{
2558 if (!connected(ps))
2559 return -ENODEV;
2560
2561 WRITE_ONCE(ps->not_yet_resumed, 1);
2562 if (!ps->suspend_allowed) {
2563 usb_autosuspend_device(ps->dev);
2564 ps->suspend_allowed = true;
2565 }
2566 return 0;
2567}
2568
2569static int proc_wait_for_resume(struct usb_dev_state *ps)
2570{
2571 int ret;
2572
2573 usb_unlock_device(ps->dev);
2574 ret = wait_event_interruptible(ps->wait_for_resume,
2575 READ_ONCE(ps->not_yet_resumed) == 0);
2576 usb_lock_device(ps->dev);
2577
2578 if (ret != 0)
2579 return -EINTR;
2580 return proc_forbid_suspend(ps);
2581}
2582
2583/*
2584 * NOTE: All requests here that have interface numbers as parameters
2585 * are assuming that somehow the configuration has been prevented from
2586 * changing. But there's no mechanism to ensure that...
2587 */
2588static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2589 void __user *p)
2590{
2591 struct usb_dev_state *ps = file->private_data;
2592 struct inode *inode = file_inode(file);
2593 struct usb_device *dev = ps->dev;
2594 int ret = -ENOTTY;
2595
2596 if (!(file->f_mode & FMODE_WRITE))
2597 return -EPERM;
2598
2599 usb_lock_device(dev);
2600
2601 /* Reap operations are allowed even after disconnection */
2602 switch (cmd) {
2603 case USBDEVFS_REAPURB:
2604 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2605 ret = proc_reapurb(ps, p);
2606 goto done;
2607
2608 case USBDEVFS_REAPURBNDELAY:
2609 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2610 ret = proc_reapurbnonblock(ps, p);
2611 goto done;
2612
2613#ifdef CONFIG_COMPAT
2614 case USBDEVFS_REAPURB32:
2615 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2616 ret = proc_reapurb_compat(ps, p);
2617 goto done;
2618
2619 case USBDEVFS_REAPURBNDELAY32:
2620 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2621 ret = proc_reapurbnonblock_compat(ps, p);
2622 goto done;
2623#endif
2624 }
2625
2626 if (!connected(ps)) {
2627 usb_unlock_device(dev);
2628 return -ENODEV;
2629 }
2630
2631 switch (cmd) {
2632 case USBDEVFS_CONTROL:
2633 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2634 ret = proc_control(ps, p);
2635 if (ret >= 0)
2636 inode->i_mtime = current_time(inode);
2637 break;
2638
2639 case USBDEVFS_BULK:
2640 snoop(&dev->dev, "%s: BULK\n", __func__);
2641 ret = proc_bulk(ps, p);
2642 if (ret >= 0)
2643 inode->i_mtime = current_time(inode);
2644 break;
2645
2646 case USBDEVFS_RESETEP:
2647 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2648 ret = proc_resetep(ps, p);
2649 if (ret >= 0)
2650 inode->i_mtime = current_time(inode);
2651 break;
2652
2653 case USBDEVFS_RESET:
2654 snoop(&dev->dev, "%s: RESET\n", __func__);
2655 ret = proc_resetdevice(ps);
2656 break;
2657
2658 case USBDEVFS_CLEAR_HALT:
2659 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2660 ret = proc_clearhalt(ps, p);
2661 if (ret >= 0)
2662 inode->i_mtime = current_time(inode);
2663 break;
2664
2665 case USBDEVFS_GETDRIVER:
2666 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2667 ret = proc_getdriver(ps, p);
2668 break;
2669
2670 case USBDEVFS_CONNECTINFO:
2671 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2672 ret = proc_connectinfo(ps, p);
2673 break;
2674
2675 case USBDEVFS_SETINTERFACE:
2676 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2677 ret = proc_setintf(ps, p);
2678 break;
2679
2680 case USBDEVFS_SETCONFIGURATION:
2681 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2682 ret = proc_setconfig(ps, p);
2683 break;
2684
2685 case USBDEVFS_SUBMITURB:
2686 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2687 ret = proc_submiturb(ps, p);
2688 if (ret >= 0)
2689 inode->i_mtime = current_time(inode);
2690 break;
2691
2692#ifdef CONFIG_COMPAT
2693 case USBDEVFS_CONTROL32:
2694 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2695 ret = proc_control_compat(ps, p);
2696 if (ret >= 0)
2697 inode->i_mtime = current_time(inode);
2698 break;
2699
2700 case USBDEVFS_BULK32:
2701 snoop(&dev->dev, "%s: BULK32\n", __func__);
2702 ret = proc_bulk_compat(ps, p);
2703 if (ret >= 0)
2704 inode->i_mtime = current_time(inode);
2705 break;
2706
2707 case USBDEVFS_DISCSIGNAL32:
2708 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2709 ret = proc_disconnectsignal_compat(ps, p);
2710 break;
2711
2712 case USBDEVFS_SUBMITURB32:
2713 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2714 ret = proc_submiturb_compat(ps, p);
2715 if (ret >= 0)
2716 inode->i_mtime = current_time(inode);
2717 break;
2718
2719 case USBDEVFS_IOCTL32:
2720 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2721 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2722 break;
2723#endif
2724
2725 case USBDEVFS_DISCARDURB:
2726 snoop(&dev->dev, "%s: DISCARDURB %px\n", __func__, p);
2727 ret = proc_unlinkurb(ps, p);
2728 break;
2729
2730 case USBDEVFS_DISCSIGNAL:
2731 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2732 ret = proc_disconnectsignal(ps, p);
2733 break;
2734
2735 case USBDEVFS_CLAIMINTERFACE:
2736 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2737 ret = proc_claiminterface(ps, p);
2738 break;
2739
2740 case USBDEVFS_RELEASEINTERFACE:
2741 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2742 ret = proc_releaseinterface(ps, p);
2743 break;
2744
2745 case USBDEVFS_IOCTL:
2746 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2747 ret = proc_ioctl_default(ps, p);
2748 break;
2749
2750 case USBDEVFS_CLAIM_PORT:
2751 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2752 ret = proc_claim_port(ps, p);
2753 break;
2754
2755 case USBDEVFS_RELEASE_PORT:
2756 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2757 ret = proc_release_port(ps, p);
2758 break;
2759 case USBDEVFS_GET_CAPABILITIES:
2760 ret = proc_get_capabilities(ps, p);
2761 break;
2762 case USBDEVFS_DISCONNECT_CLAIM:
2763 ret = proc_disconnect_claim(ps, p);
2764 break;
2765 case USBDEVFS_ALLOC_STREAMS:
2766 ret = proc_alloc_streams(ps, p);
2767 break;
2768 case USBDEVFS_FREE_STREAMS:
2769 ret = proc_free_streams(ps, p);
2770 break;
2771 case USBDEVFS_DROP_PRIVILEGES:
2772 ret = proc_drop_privileges(ps, p);
2773 break;
2774 case USBDEVFS_GET_SPEED:
2775 ret = ps->dev->speed;
2776 break;
2777 case USBDEVFS_FORBID_SUSPEND:
2778 ret = proc_forbid_suspend(ps);
2779 break;
2780 case USBDEVFS_ALLOW_SUSPEND:
2781 ret = proc_allow_suspend(ps);
2782 break;
2783 case USBDEVFS_WAIT_FOR_RESUME:
2784 ret = proc_wait_for_resume(ps);
2785 break;
2786 }
2787
2788 /* Handle variable-length commands */
2789 switch (cmd & ~IOCSIZE_MASK) {
2790 case USBDEVFS_CONNINFO_EX(0):
2791 ret = proc_conninfo_ex(ps, p, _IOC_SIZE(cmd));
2792 break;
2793 }
2794
2795 done:
2796 usb_unlock_device(dev);
2797 if (ret >= 0)
2798 inode->i_atime = current_time(inode);
2799 return ret;
2800}
2801
2802static long usbdev_ioctl(struct file *file, unsigned int cmd,
2803 unsigned long arg)
2804{
2805 int ret;
2806
2807 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2808
2809 return ret;
2810}
2811
2812/* No kernel lock - fine */
2813static __poll_t usbdev_poll(struct file *file,
2814 struct poll_table_struct *wait)
2815{
2816 struct usb_dev_state *ps = file->private_data;
2817 __poll_t mask = 0;
2818
2819 poll_wait(file, &ps->wait, wait);
2820 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2821 mask |= EPOLLOUT | EPOLLWRNORM;
2822 if (!connected(ps))
2823 mask |= EPOLLHUP;
2824 if (list_empty(&ps->list))
2825 mask |= EPOLLERR;
2826 return mask;
2827}
2828
2829const struct file_operations usbdev_file_operations = {
2830 .owner = THIS_MODULE,
2831 .llseek = no_seek_end_llseek,
2832 .read = usbdev_read,
2833 .poll = usbdev_poll,
2834 .unlocked_ioctl = usbdev_ioctl,
2835 .compat_ioctl = compat_ptr_ioctl,
2836 .mmap = usbdev_mmap,
2837 .open = usbdev_open,
2838 .release = usbdev_release,
2839};
2840
2841static void usbdev_remove(struct usb_device *udev)
2842{
2843 struct usb_dev_state *ps;
2844
2845 /* Protect against simultaneous resume */
2846 mutex_lock(&usbfs_mutex);
2847 while (!list_empty(&udev->filelist)) {
2848 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2849 destroy_all_async(ps);
2850 wake_up_all(&ps->wait);
2851 WRITE_ONCE(ps->not_yet_resumed, 0);
2852 wake_up_all(&ps->wait_for_resume);
2853 list_del_init(&ps->list);
2854 if (ps->discsignr)
2855 kill_pid_usb_asyncio(ps->discsignr, EPIPE, ps->disccontext,
2856 ps->disc_pid, ps->cred);
2857 }
2858 mutex_unlock(&usbfs_mutex);
2859}
2860
2861static int usbdev_notify(struct notifier_block *self,
2862 unsigned long action, void *dev)
2863{
2864 switch (action) {
2865 case USB_DEVICE_ADD:
2866 break;
2867 case USB_DEVICE_REMOVE:
2868 usbdev_remove(dev);
2869 break;
2870 }
2871 return NOTIFY_OK;
2872}
2873
2874static struct notifier_block usbdev_nb = {
2875 .notifier_call = usbdev_notify,
2876};
2877
2878static struct cdev usb_device_cdev;
2879
2880int __init usb_devio_init(void)
2881{
2882 int retval;
2883
2884 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2885 "usb_device");
2886 if (retval) {
2887 printk(KERN_ERR "Unable to register minors for usb_device\n");
2888 goto out;
2889 }
2890 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2891 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2892 if (retval) {
2893 printk(KERN_ERR "Unable to get usb_device major %d\n",
2894 USB_DEVICE_MAJOR);
2895 goto error_cdev;
2896 }
2897 usb_register_notify(&usbdev_nb);
2898out:
2899 return retval;
2900
2901error_cdev:
2902 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2903 goto out;
2904}
2905
2906void usb_devio_cleanup(void)
2907{
2908 usb_unregister_notify(&usbdev_nb);
2909 cdev_del(&usb_device_cdev);
2910 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2911}
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 */
58static DEFINE_MUTEX(usbfs_mutex);
59
60struct 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
82struct 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
93struct 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
111static bool usbfs_snoop;
112module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
113MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
114
115static unsigned usbfs_snoop_max = 65536;
116module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR);
117MODULE_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
126enum 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 */
133static u32 usbfs_memory_mb = 16;
134module_param(usbfs_memory_mb, uint, 0644);
135MODULE_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
141static atomic64_t usbfs_memory_usage; /* Total memory currently allocated */
142
143/* Check whether it's okay to allocate more memory for a transfer */
144static 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 */
162static void usbfs_decrease_memory_usage(u64 amount)
163{
164 atomic64_sub(amount, &usbfs_memory_usage);
165}
166
167static int connected(struct usb_dev_state *ps)
168{
169 return (!list_empty(&ps->list) &&
170 ps->dev->state != USB_STATE_NOTATTACHED);
171}
172
173static 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
194static 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
204static 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
211static const struct vm_operations_struct usbdev_vm_ops = {
212 .open = usbdev_vm_open,
213 .close = usbdev_vm_close
214};
215
216static 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
280error_free_usbm:
281 kfree(usbm);
282error_decrease_mem:
283 usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
284error:
285 return ret;
286}
287
288static 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
369err:
370 usb_unlock_device(dev);
371 return ret;
372}
373
374/*
375 * async list handling
376 */
377
378static 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
393static 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
417static 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
427static 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
437static 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
452static 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
466static 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 %px, ep%d %s-%s, "
486 "length %u\n",
487 userurb, ep, t, d, length);
488 else
489 dev_info(&udev->dev, "userurb %px, 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
511static 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
533static 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
562static 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
600static 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
640static 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
662static 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
677static 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
688static int driver_probe(struct usb_interface *intf,
689 const struct usb_device_id *id)
690{
691 return -ENODEV;
692}
693
694static 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 */
719static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
720{
721 return 0;
722}
723
724static int driver_resume(struct usb_interface *intf)
725{
726 return 0;
727}
728
729/* The following routines apply to the entire device, not interfaces */
730void usbfs_notify_suspend(struct usb_device *udev)
731{
732 /* We don't need to handle this */
733}
734
735void 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
748struct 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
757static 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
790static 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
816static 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
831static 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
856static 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
915static 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
924static 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
992error:
993 kfree(eps);
994 return ret;
995}
996
997static 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 */
1010static 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
1067static 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
1105static int do_proc_control(struct usb_dev_state *ps,
1106 struct usbdevfs_ctrltransfer *ctrl)
1107{
1108 struct usb_device *dev = ps->dev;
1109 unsigned int tmo;
1110 unsigned char *tbuf;
1111 unsigned wLength;
1112 int i, pipe, ret;
1113
1114 ret = check_ctrlrecip(ps, ctrl->bRequestType, ctrl->bRequest,
1115 ctrl->wIndex);
1116 if (ret)
1117 return ret;
1118 wLength = ctrl->wLength; /* To suppress 64k PAGE_SIZE warning */
1119 if (wLength > PAGE_SIZE)
1120 return -EINVAL;
1121 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1122 sizeof(struct usb_ctrlrequest));
1123 if (ret)
1124 return ret;
1125 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1126 if (!tbuf) {
1127 ret = -ENOMEM;
1128 goto done;
1129 }
1130 tmo = ctrl->timeout;
1131 snoop(&dev->dev, "control urb: bRequestType=%02x "
1132 "bRequest=%02x wValue=%04x "
1133 "wIndex=%04x wLength=%04x\n",
1134 ctrl->bRequestType, ctrl->bRequest, ctrl->wValue,
1135 ctrl->wIndex, ctrl->wLength);
1136 if ((ctrl->bRequestType & USB_DIR_IN) && ctrl->wLength) {
1137 pipe = usb_rcvctrlpipe(dev, 0);
1138 snoop_urb(dev, NULL, pipe, ctrl->wLength, tmo, SUBMIT, NULL, 0);
1139
1140 usb_unlock_device(dev);
1141 i = usb_control_msg(dev, pipe, ctrl->bRequest,
1142 ctrl->bRequestType, ctrl->wValue, ctrl->wIndex,
1143 tbuf, ctrl->wLength, tmo);
1144 usb_lock_device(dev);
1145 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
1146 tbuf, max(i, 0));
1147 if ((i > 0) && ctrl->wLength) {
1148 if (copy_to_user(ctrl->data, tbuf, i)) {
1149 ret = -EFAULT;
1150 goto done;
1151 }
1152 }
1153 } else {
1154 if (ctrl->wLength) {
1155 if (copy_from_user(tbuf, ctrl->data, ctrl->wLength)) {
1156 ret = -EFAULT;
1157 goto done;
1158 }
1159 }
1160 pipe = usb_sndctrlpipe(dev, 0);
1161 snoop_urb(dev, NULL, pipe, ctrl->wLength, tmo, SUBMIT,
1162 tbuf, ctrl->wLength);
1163
1164 usb_unlock_device(dev);
1165 i = usb_control_msg(dev, pipe, ctrl->bRequest,
1166 ctrl->bRequestType, ctrl->wValue, ctrl->wIndex,
1167 tbuf, ctrl->wLength, tmo);
1168 usb_lock_device(dev);
1169 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
1170 }
1171 if (i < 0 && i != -EPIPE) {
1172 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1173 "failed cmd %s rqt %u rq %u len %u ret %d\n",
1174 current->comm, ctrl->bRequestType, ctrl->bRequest,
1175 ctrl->wLength, i);
1176 }
1177 ret = i;
1178 done:
1179 free_page((unsigned long) tbuf);
1180 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1181 sizeof(struct usb_ctrlrequest));
1182 return ret;
1183}
1184
1185static int proc_control(struct usb_dev_state *ps, void __user *arg)
1186{
1187 struct usbdevfs_ctrltransfer ctrl;
1188
1189 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1190 return -EFAULT;
1191 return do_proc_control(ps, &ctrl);
1192}
1193
1194static int do_proc_bulk(struct usb_dev_state *ps,
1195 struct usbdevfs_bulktransfer *bulk)
1196{
1197 struct usb_device *dev = ps->dev;
1198 unsigned int tmo, len1, pipe;
1199 int len2;
1200 unsigned char *tbuf;
1201 int i, ret;
1202
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
1222 /*
1223 * len1 can be almost arbitrarily large. Don't WARN if it's
1224 * too big, just fail the request.
1225 */
1226 tbuf = kmalloc(len1, GFP_KERNEL | __GFP_NOWARN);
1227 if (!tbuf) {
1228 ret = -ENOMEM;
1229 goto done;
1230 }
1231 tmo = bulk->timeout;
1232 if (bulk->ep & 0x80) {
1233 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1234
1235 usb_unlock_device(dev);
1236 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1237 usb_lock_device(dev);
1238 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1239
1240 if (!i && len2) {
1241 if (copy_to_user(bulk->data, tbuf, len2)) {
1242 ret = -EFAULT;
1243 goto done;
1244 }
1245 }
1246 } else {
1247 if (len1) {
1248 if (copy_from_user(tbuf, bulk->data, len1)) {
1249 ret = -EFAULT;
1250 goto done;
1251 }
1252 }
1253 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1254
1255 usb_unlock_device(dev);
1256 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1257 usb_lock_device(dev);
1258 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1259 }
1260 ret = (i < 0 ? i : len2);
1261 done:
1262 kfree(tbuf);
1263 usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1264 return ret;
1265}
1266
1267static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1268{
1269 struct usbdevfs_bulktransfer bulk;
1270
1271 if (copy_from_user(&bulk, arg, sizeof(bulk)))
1272 return -EFAULT;
1273 return do_proc_bulk(ps, &bulk);
1274}
1275
1276static void check_reset_of_active_ep(struct usb_device *udev,
1277 unsigned int epnum, char *ioctl_name)
1278{
1279 struct usb_host_endpoint **eps;
1280 struct usb_host_endpoint *ep;
1281
1282 eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1283 ep = eps[epnum & 0x0f];
1284 if (ep && !list_empty(&ep->urb_list))
1285 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1286 task_pid_nr(current), current->comm,
1287 ioctl_name, epnum);
1288}
1289
1290static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1291{
1292 unsigned int ep;
1293 int ret;
1294
1295 if (get_user(ep, (unsigned int __user *)arg))
1296 return -EFAULT;
1297 ret = findintfep(ps->dev, ep);
1298 if (ret < 0)
1299 return ret;
1300 ret = checkintf(ps, ret);
1301 if (ret)
1302 return ret;
1303 check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1304 usb_reset_endpoint(ps->dev, ep);
1305 return 0;
1306}
1307
1308static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1309{
1310 unsigned int ep;
1311 int pipe;
1312 int ret;
1313
1314 if (get_user(ep, (unsigned int __user *)arg))
1315 return -EFAULT;
1316 ret = findintfep(ps->dev, ep);
1317 if (ret < 0)
1318 return ret;
1319 ret = checkintf(ps, ret);
1320 if (ret)
1321 return ret;
1322 check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1323 if (ep & USB_DIR_IN)
1324 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1325 else
1326 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1327
1328 return usb_clear_halt(ps->dev, pipe);
1329}
1330
1331static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1332{
1333 struct usbdevfs_getdriver gd;
1334 struct usb_interface *intf;
1335 int ret;
1336
1337 if (copy_from_user(&gd, arg, sizeof(gd)))
1338 return -EFAULT;
1339 intf = usb_ifnum_to_if(ps->dev, gd.interface);
1340 if (!intf || !intf->dev.driver)
1341 ret = -ENODATA;
1342 else {
1343 strlcpy(gd.driver, intf->dev.driver->name,
1344 sizeof(gd.driver));
1345 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1346 }
1347 return ret;
1348}
1349
1350static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1351{
1352 struct usbdevfs_connectinfo ci;
1353
1354 memset(&ci, 0, sizeof(ci));
1355 ci.devnum = ps->dev->devnum;
1356 ci.slow = ps->dev->speed == USB_SPEED_LOW;
1357
1358 if (copy_to_user(arg, &ci, sizeof(ci)))
1359 return -EFAULT;
1360 return 0;
1361}
1362
1363static int proc_conninfo_ex(struct usb_dev_state *ps,
1364 void __user *arg, size_t size)
1365{
1366 struct usbdevfs_conninfo_ex ci;
1367 struct usb_device *udev = ps->dev;
1368
1369 if (size < sizeof(ci.size))
1370 return -EINVAL;
1371
1372 memset(&ci, 0, sizeof(ci));
1373 ci.size = sizeof(ci);
1374 ci.busnum = udev->bus->busnum;
1375 ci.devnum = udev->devnum;
1376 ci.speed = udev->speed;
1377
1378 while (udev && udev->portnum != 0) {
1379 if (++ci.num_ports <= ARRAY_SIZE(ci.ports))
1380 ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports] =
1381 udev->portnum;
1382 udev = udev->parent;
1383 }
1384
1385 if (ci.num_ports < ARRAY_SIZE(ci.ports))
1386 memmove(&ci.ports[0],
1387 &ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports],
1388 ci.num_ports);
1389
1390 if (copy_to_user(arg, &ci, min(sizeof(ci), size)))
1391 return -EFAULT;
1392
1393 return 0;
1394}
1395
1396static int proc_resetdevice(struct usb_dev_state *ps)
1397{
1398 struct usb_host_config *actconfig = ps->dev->actconfig;
1399 struct usb_interface *interface;
1400 int i, number;
1401
1402 /* Don't allow a device reset if the process has dropped the
1403 * privilege to do such things and any of the interfaces are
1404 * currently claimed.
1405 */
1406 if (ps->privileges_dropped && actconfig) {
1407 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1408 interface = actconfig->interface[i];
1409 number = interface->cur_altsetting->desc.bInterfaceNumber;
1410 if (usb_interface_claimed(interface) &&
1411 !test_bit(number, &ps->ifclaimed)) {
1412 dev_warn(&ps->dev->dev,
1413 "usbfs: interface %d claimed by %s while '%s' resets device\n",
1414 number, interface->dev.driver->name, current->comm);
1415 return -EACCES;
1416 }
1417 }
1418 }
1419
1420 return usb_reset_device(ps->dev);
1421}
1422
1423static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1424{
1425 struct usbdevfs_setinterface setintf;
1426 int ret;
1427
1428 if (copy_from_user(&setintf, arg, sizeof(setintf)))
1429 return -EFAULT;
1430 ret = checkintf(ps, setintf.interface);
1431 if (ret)
1432 return ret;
1433
1434 destroy_async_on_interface(ps, setintf.interface);
1435
1436 return usb_set_interface(ps->dev, setintf.interface,
1437 setintf.altsetting);
1438}
1439
1440static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1441{
1442 int u;
1443 int status = 0;
1444 struct usb_host_config *actconfig;
1445
1446 if (get_user(u, (int __user *)arg))
1447 return -EFAULT;
1448
1449 actconfig = ps->dev->actconfig;
1450
1451 /* Don't touch the device if any interfaces are claimed.
1452 * It could interfere with other drivers' operations, and if
1453 * an interface is claimed by usbfs it could easily deadlock.
1454 */
1455 if (actconfig) {
1456 int i;
1457
1458 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1459 if (usb_interface_claimed(actconfig->interface[i])) {
1460 dev_warn(&ps->dev->dev,
1461 "usbfs: interface %d claimed by %s "
1462 "while '%s' sets config #%d\n",
1463 actconfig->interface[i]
1464 ->cur_altsetting
1465 ->desc.bInterfaceNumber,
1466 actconfig->interface[i]
1467 ->dev.driver->name,
1468 current->comm, u);
1469 status = -EBUSY;
1470 break;
1471 }
1472 }
1473 }
1474
1475 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1476 * so avoid usb_set_configuration()'s kick to sysfs
1477 */
1478 if (status == 0) {
1479 if (actconfig && actconfig->desc.bConfigurationValue == u)
1480 status = usb_reset_configuration(ps->dev);
1481 else
1482 status = usb_set_configuration(ps->dev, u);
1483 }
1484
1485 return status;
1486}
1487
1488static struct usb_memory *
1489find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
1490{
1491 struct usb_memory *usbm = NULL, *iter;
1492 unsigned long flags;
1493 unsigned long uurb_start = (unsigned long)uurb->buffer;
1494
1495 spin_lock_irqsave(&ps->lock, flags);
1496 list_for_each_entry(iter, &ps->memory_list, memlist) {
1497 if (uurb_start >= iter->vm_start &&
1498 uurb_start < iter->vm_start + iter->size) {
1499 if (uurb->buffer_length > iter->vm_start + iter->size -
1500 uurb_start) {
1501 usbm = ERR_PTR(-EINVAL);
1502 } else {
1503 usbm = iter;
1504 usbm->urb_use_count++;
1505 }
1506 break;
1507 }
1508 }
1509 spin_unlock_irqrestore(&ps->lock, flags);
1510 return usbm;
1511}
1512
1513static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1514 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1515 void __user *arg, sigval_t userurb_sigval)
1516{
1517 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1518 struct usb_host_endpoint *ep;
1519 struct async *as = NULL;
1520 struct usb_ctrlrequest *dr = NULL;
1521 unsigned int u, totlen, isofrmlen;
1522 int i, ret, num_sgs = 0, ifnum = -1;
1523 int number_of_packets = 0;
1524 unsigned int stream_id = 0;
1525 void *buf;
1526 bool is_in;
1527 bool allow_short = false;
1528 bool allow_zero = false;
1529 unsigned long mask = USBDEVFS_URB_SHORT_NOT_OK |
1530 USBDEVFS_URB_BULK_CONTINUATION |
1531 USBDEVFS_URB_NO_FSBR |
1532 USBDEVFS_URB_ZERO_PACKET |
1533 USBDEVFS_URB_NO_INTERRUPT;
1534 /* USBDEVFS_URB_ISO_ASAP is a special case */
1535 if (uurb->type == USBDEVFS_URB_TYPE_ISO)
1536 mask |= USBDEVFS_URB_ISO_ASAP;
1537
1538 if (uurb->flags & ~mask)
1539 return -EINVAL;
1540
1541 if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
1542 return -EINVAL;
1543 if (uurb->buffer_length > 0 && !uurb->buffer)
1544 return -EINVAL;
1545 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1546 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1547 ifnum = findintfep(ps->dev, uurb->endpoint);
1548 if (ifnum < 0)
1549 return ifnum;
1550 ret = checkintf(ps, ifnum);
1551 if (ret)
1552 return ret;
1553 }
1554 ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1555 if (!ep)
1556 return -ENOENT;
1557 is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1558
1559 u = 0;
1560 switch (uurb->type) {
1561 case USBDEVFS_URB_TYPE_CONTROL:
1562 if (!usb_endpoint_xfer_control(&ep->desc))
1563 return -EINVAL;
1564 /* min 8 byte setup packet */
1565 if (uurb->buffer_length < 8)
1566 return -EINVAL;
1567 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1568 if (!dr)
1569 return -ENOMEM;
1570 if (copy_from_user(dr, uurb->buffer, 8)) {
1571 ret = -EFAULT;
1572 goto error;
1573 }
1574 if (uurb->buffer_length < (le16_to_cpu(dr->wLength) + 8)) {
1575 ret = -EINVAL;
1576 goto error;
1577 }
1578 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1579 le16_to_cpu(dr->wIndex));
1580 if (ret)
1581 goto error;
1582 uurb->buffer_length = le16_to_cpu(dr->wLength);
1583 uurb->buffer += 8;
1584 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1585 is_in = true;
1586 uurb->endpoint |= USB_DIR_IN;
1587 } else {
1588 is_in = false;
1589 uurb->endpoint &= ~USB_DIR_IN;
1590 }
1591 if (is_in)
1592 allow_short = true;
1593 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1594 "bRequest=%02x wValue=%04x "
1595 "wIndex=%04x wLength=%04x\n",
1596 dr->bRequestType, dr->bRequest,
1597 __le16_to_cpu(dr->wValue),
1598 __le16_to_cpu(dr->wIndex),
1599 __le16_to_cpu(dr->wLength));
1600 u = sizeof(struct usb_ctrlrequest);
1601 break;
1602
1603 case USBDEVFS_URB_TYPE_BULK:
1604 if (!is_in)
1605 allow_zero = true;
1606 else
1607 allow_short = true;
1608 switch (usb_endpoint_type(&ep->desc)) {
1609 case USB_ENDPOINT_XFER_CONTROL:
1610 case USB_ENDPOINT_XFER_ISOC:
1611 return -EINVAL;
1612 case USB_ENDPOINT_XFER_INT:
1613 /* allow single-shot interrupt transfers */
1614 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1615 goto interrupt_urb;
1616 }
1617 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1618 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1619 num_sgs = 0;
1620 if (ep->streams)
1621 stream_id = uurb->stream_id;
1622 break;
1623
1624 case USBDEVFS_URB_TYPE_INTERRUPT:
1625 if (!usb_endpoint_xfer_int(&ep->desc))
1626 return -EINVAL;
1627 interrupt_urb:
1628 if (!is_in)
1629 allow_zero = true;
1630 else
1631 allow_short = true;
1632 break;
1633
1634 case USBDEVFS_URB_TYPE_ISO:
1635 /* arbitrary limit */
1636 if (uurb->number_of_packets < 1 ||
1637 uurb->number_of_packets > 128)
1638 return -EINVAL;
1639 if (!usb_endpoint_xfer_isoc(&ep->desc))
1640 return -EINVAL;
1641 number_of_packets = uurb->number_of_packets;
1642 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1643 number_of_packets;
1644 isopkt = memdup_user(iso_frame_desc, isofrmlen);
1645 if (IS_ERR(isopkt)) {
1646 ret = PTR_ERR(isopkt);
1647 isopkt = NULL;
1648 goto error;
1649 }
1650 for (totlen = u = 0; u < number_of_packets; u++) {
1651 /*
1652 * arbitrary limit need for USB 3.1 Gen2
1653 * sizemax: 96 DPs at SSP, 96 * 1024 = 98304
1654 */
1655 if (isopkt[u].length > 98304) {
1656 ret = -EINVAL;
1657 goto error;
1658 }
1659 totlen += isopkt[u].length;
1660 }
1661 u *= sizeof(struct usb_iso_packet_descriptor);
1662 uurb->buffer_length = totlen;
1663 break;
1664
1665 default:
1666 return -EINVAL;
1667 }
1668
1669 if (uurb->buffer_length > 0 &&
1670 !access_ok(uurb->buffer, uurb->buffer_length)) {
1671 ret = -EFAULT;
1672 goto error;
1673 }
1674 as = alloc_async(number_of_packets);
1675 if (!as) {
1676 ret = -ENOMEM;
1677 goto error;
1678 }
1679
1680 as->usbm = find_memory_area(ps, uurb);
1681 if (IS_ERR(as->usbm)) {
1682 ret = PTR_ERR(as->usbm);
1683 as->usbm = NULL;
1684 goto error;
1685 }
1686
1687 /* do not use SG buffers when memory mapped segments
1688 * are in use
1689 */
1690 if (as->usbm)
1691 num_sgs = 0;
1692
1693 u += sizeof(struct async) + sizeof(struct urb) +
1694 (as->usbm ? 0 : uurb->buffer_length) +
1695 num_sgs * sizeof(struct scatterlist);
1696 ret = usbfs_increase_memory_usage(u);
1697 if (ret)
1698 goto error;
1699 as->mem_usage = u;
1700
1701 if (num_sgs) {
1702 as->urb->sg = kmalloc_array(num_sgs,
1703 sizeof(struct scatterlist),
1704 GFP_KERNEL | __GFP_NOWARN);
1705 if (!as->urb->sg) {
1706 ret = -ENOMEM;
1707 goto error;
1708 }
1709 as->urb->num_sgs = num_sgs;
1710 sg_init_table(as->urb->sg, as->urb->num_sgs);
1711
1712 totlen = uurb->buffer_length;
1713 for (i = 0; i < as->urb->num_sgs; i++) {
1714 u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1715 buf = kmalloc(u, GFP_KERNEL);
1716 if (!buf) {
1717 ret = -ENOMEM;
1718 goto error;
1719 }
1720 sg_set_buf(&as->urb->sg[i], buf, u);
1721
1722 if (!is_in) {
1723 if (copy_from_user(buf, uurb->buffer, u)) {
1724 ret = -EFAULT;
1725 goto error;
1726 }
1727 uurb->buffer += u;
1728 }
1729 totlen -= u;
1730 }
1731 } else if (uurb->buffer_length > 0) {
1732 if (as->usbm) {
1733 unsigned long uurb_start = (unsigned long)uurb->buffer;
1734
1735 as->urb->transfer_buffer = as->usbm->mem +
1736 (uurb_start - as->usbm->vm_start);
1737 } else {
1738 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1739 GFP_KERNEL | __GFP_NOWARN);
1740 if (!as->urb->transfer_buffer) {
1741 ret = -ENOMEM;
1742 goto error;
1743 }
1744 if (!is_in) {
1745 if (copy_from_user(as->urb->transfer_buffer,
1746 uurb->buffer,
1747 uurb->buffer_length)) {
1748 ret = -EFAULT;
1749 goto error;
1750 }
1751 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1752 /*
1753 * Isochronous input data may end up being
1754 * discontiguous if some of the packets are
1755 * short. Clear the buffer so that the gaps
1756 * don't leak kernel data to userspace.
1757 */
1758 memset(as->urb->transfer_buffer, 0,
1759 uurb->buffer_length);
1760 }
1761 }
1762 }
1763 as->urb->dev = ps->dev;
1764 as->urb->pipe = (uurb->type << 30) |
1765 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1766 (uurb->endpoint & USB_DIR_IN);
1767
1768 /* This tedious sequence is necessary because the URB_* flags
1769 * are internal to the kernel and subject to change, whereas
1770 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1771 */
1772 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1773 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1774 u |= URB_ISO_ASAP;
1775 if (allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1776 u |= URB_SHORT_NOT_OK;
1777 if (allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1778 u |= URB_ZERO_PACKET;
1779 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1780 u |= URB_NO_INTERRUPT;
1781 as->urb->transfer_flags = u;
1782
1783 if (!allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1784 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_SHORT_NOT_OK.\n");
1785 if (!allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1786 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_ZERO_PACKET.\n");
1787
1788 as->urb->transfer_buffer_length = uurb->buffer_length;
1789 as->urb->setup_packet = (unsigned char *)dr;
1790 dr = NULL;
1791 as->urb->start_frame = uurb->start_frame;
1792 as->urb->number_of_packets = number_of_packets;
1793 as->urb->stream_id = stream_id;
1794
1795 if (ep->desc.bInterval) {
1796 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1797 ps->dev->speed == USB_SPEED_HIGH ||
1798 ps->dev->speed >= USB_SPEED_SUPER)
1799 as->urb->interval = 1 <<
1800 min(15, ep->desc.bInterval - 1);
1801 else
1802 as->urb->interval = ep->desc.bInterval;
1803 }
1804
1805 as->urb->context = as;
1806 as->urb->complete = async_completed;
1807 for (totlen = u = 0; u < number_of_packets; u++) {
1808 as->urb->iso_frame_desc[u].offset = totlen;
1809 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1810 totlen += isopkt[u].length;
1811 }
1812 kfree(isopkt);
1813 isopkt = NULL;
1814 as->ps = ps;
1815 as->userurb = arg;
1816 as->userurb_sigval = userurb_sigval;
1817 if (as->usbm) {
1818 unsigned long uurb_start = (unsigned long)uurb->buffer;
1819
1820 as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1821 as->urb->transfer_dma = as->usbm->dma_handle +
1822 (uurb_start - as->usbm->vm_start);
1823 } else if (is_in && uurb->buffer_length > 0)
1824 as->userbuffer = uurb->buffer;
1825 as->signr = uurb->signr;
1826 as->ifnum = ifnum;
1827 as->pid = get_pid(task_pid(current));
1828 as->cred = get_current_cred();
1829 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1830 as->urb->transfer_buffer_length, 0, SUBMIT,
1831 NULL, 0);
1832 if (!is_in)
1833 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1834
1835 async_newpending(as);
1836
1837 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1838 spin_lock_irq(&ps->lock);
1839
1840 /* Not exactly the endpoint address; the direction bit is
1841 * shifted to the 0x10 position so that the value will be
1842 * between 0 and 31.
1843 */
1844 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1845 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1846 >> 3);
1847
1848 /* If this bulk URB is the start of a new transfer, re-enable
1849 * the endpoint. Otherwise mark it as a continuation URB.
1850 */
1851 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1852 as->bulk_status = AS_CONTINUATION;
1853 else
1854 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1855
1856 /* Don't accept continuation URBs if the endpoint is
1857 * disabled because of an earlier error.
1858 */
1859 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1860 ret = -EREMOTEIO;
1861 else
1862 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1863 spin_unlock_irq(&ps->lock);
1864 } else {
1865 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1866 }
1867
1868 if (ret) {
1869 dev_printk(KERN_DEBUG, &ps->dev->dev,
1870 "usbfs: usb_submit_urb returned %d\n", ret);
1871 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1872 0, ret, COMPLETE, NULL, 0);
1873 async_removepending(as);
1874 goto error;
1875 }
1876 return 0;
1877
1878 error:
1879 kfree(isopkt);
1880 kfree(dr);
1881 if (as)
1882 free_async(as);
1883 return ret;
1884}
1885
1886static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1887{
1888 struct usbdevfs_urb uurb;
1889 sigval_t userurb_sigval;
1890
1891 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1892 return -EFAULT;
1893
1894 memset(&userurb_sigval, 0, sizeof(userurb_sigval));
1895 userurb_sigval.sival_ptr = arg;
1896
1897 return proc_do_submiturb(ps, &uurb,
1898 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1899 arg, userurb_sigval);
1900}
1901
1902static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1903{
1904 struct urb *urb;
1905 struct async *as;
1906 unsigned long flags;
1907
1908 spin_lock_irqsave(&ps->lock, flags);
1909 as = async_getpending(ps, arg);
1910 if (!as) {
1911 spin_unlock_irqrestore(&ps->lock, flags);
1912 return -EINVAL;
1913 }
1914
1915 urb = as->urb;
1916 usb_get_urb(urb);
1917 spin_unlock_irqrestore(&ps->lock, flags);
1918
1919 usb_kill_urb(urb);
1920 usb_put_urb(urb);
1921
1922 return 0;
1923}
1924
1925static void compute_isochronous_actual_length(struct urb *urb)
1926{
1927 unsigned int i;
1928
1929 if (urb->number_of_packets > 0) {
1930 urb->actual_length = 0;
1931 for (i = 0; i < urb->number_of_packets; i++)
1932 urb->actual_length +=
1933 urb->iso_frame_desc[i].actual_length;
1934 }
1935}
1936
1937static int processcompl(struct async *as, void __user * __user *arg)
1938{
1939 struct urb *urb = as->urb;
1940 struct usbdevfs_urb __user *userurb = as->userurb;
1941 void __user *addr = as->userurb;
1942 unsigned int i;
1943
1944 compute_isochronous_actual_length(urb);
1945 if (as->userbuffer && urb->actual_length) {
1946 if (copy_urb_data_to_user(as->userbuffer, urb))
1947 goto err_out;
1948 }
1949 if (put_user(as->status, &userurb->status))
1950 goto err_out;
1951 if (put_user(urb->actual_length, &userurb->actual_length))
1952 goto err_out;
1953 if (put_user(urb->error_count, &userurb->error_count))
1954 goto err_out;
1955
1956 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1957 for (i = 0; i < urb->number_of_packets; i++) {
1958 if (put_user(urb->iso_frame_desc[i].actual_length,
1959 &userurb->iso_frame_desc[i].actual_length))
1960 goto err_out;
1961 if (put_user(urb->iso_frame_desc[i].status,
1962 &userurb->iso_frame_desc[i].status))
1963 goto err_out;
1964 }
1965 }
1966
1967 if (put_user(addr, (void __user * __user *)arg))
1968 return -EFAULT;
1969 return 0;
1970
1971err_out:
1972 return -EFAULT;
1973}
1974
1975static struct async *reap_as(struct usb_dev_state *ps)
1976{
1977 DECLARE_WAITQUEUE(wait, current);
1978 struct async *as = NULL;
1979 struct usb_device *dev = ps->dev;
1980
1981 add_wait_queue(&ps->wait, &wait);
1982 for (;;) {
1983 __set_current_state(TASK_INTERRUPTIBLE);
1984 as = async_getcompleted(ps);
1985 if (as || !connected(ps))
1986 break;
1987 if (signal_pending(current))
1988 break;
1989 usb_unlock_device(dev);
1990 schedule();
1991 usb_lock_device(dev);
1992 }
1993 remove_wait_queue(&ps->wait, &wait);
1994 set_current_state(TASK_RUNNING);
1995 return as;
1996}
1997
1998static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
1999{
2000 struct async *as = reap_as(ps);
2001
2002 if (as) {
2003 int retval;
2004
2005 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2006 retval = processcompl(as, (void __user * __user *)arg);
2007 free_async(as);
2008 return retval;
2009 }
2010 if (signal_pending(current))
2011 return -EINTR;
2012 return -ENODEV;
2013}
2014
2015static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
2016{
2017 int retval;
2018 struct async *as;
2019
2020 as = async_getcompleted(ps);
2021 if (as) {
2022 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2023 retval = processcompl(as, (void __user * __user *)arg);
2024 free_async(as);
2025 } else {
2026 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2027 }
2028 return retval;
2029}
2030
2031#ifdef CONFIG_COMPAT
2032static int proc_control_compat(struct usb_dev_state *ps,
2033 struct usbdevfs_ctrltransfer32 __user *p32)
2034{
2035 struct usbdevfs_ctrltransfer ctrl;
2036 u32 udata;
2037
2038 if (copy_from_user(&ctrl, p32, sizeof(*p32) - sizeof(compat_caddr_t)) ||
2039 get_user(udata, &p32->data))
2040 return -EFAULT;
2041 ctrl.data = compat_ptr(udata);
2042 return do_proc_control(ps, &ctrl);
2043}
2044
2045static int proc_bulk_compat(struct usb_dev_state *ps,
2046 struct usbdevfs_bulktransfer32 __user *p32)
2047{
2048 struct usbdevfs_bulktransfer bulk;
2049 compat_caddr_t addr;
2050
2051 if (get_user(bulk.ep, &p32->ep) ||
2052 get_user(bulk.len, &p32->len) ||
2053 get_user(bulk.timeout, &p32->timeout) ||
2054 get_user(addr, &p32->data))
2055 return -EFAULT;
2056 bulk.data = compat_ptr(addr);
2057 return do_proc_bulk(ps, &bulk);
2058}
2059
2060static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
2061{
2062 struct usbdevfs_disconnectsignal32 ds;
2063
2064 if (copy_from_user(&ds, arg, sizeof(ds)))
2065 return -EFAULT;
2066 ps->discsignr = ds.signr;
2067 ps->disccontext.sival_int = ds.context;
2068 return 0;
2069}
2070
2071static int get_urb32(struct usbdevfs_urb *kurb,
2072 struct usbdevfs_urb32 __user *uurb)
2073{
2074 struct usbdevfs_urb32 urb32;
2075 if (copy_from_user(&urb32, uurb, sizeof(*uurb)))
2076 return -EFAULT;
2077 kurb->type = urb32.type;
2078 kurb->endpoint = urb32.endpoint;
2079 kurb->status = urb32.status;
2080 kurb->flags = urb32.flags;
2081 kurb->buffer = compat_ptr(urb32.buffer);
2082 kurb->buffer_length = urb32.buffer_length;
2083 kurb->actual_length = urb32.actual_length;
2084 kurb->start_frame = urb32.start_frame;
2085 kurb->number_of_packets = urb32.number_of_packets;
2086 kurb->error_count = urb32.error_count;
2087 kurb->signr = urb32.signr;
2088 kurb->usercontext = compat_ptr(urb32.usercontext);
2089 return 0;
2090}
2091
2092static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
2093{
2094 struct usbdevfs_urb uurb;
2095 sigval_t userurb_sigval;
2096
2097 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
2098 return -EFAULT;
2099
2100 memset(&userurb_sigval, 0, sizeof(userurb_sigval));
2101 userurb_sigval.sival_int = ptr_to_compat(arg);
2102
2103 return proc_do_submiturb(ps, &uurb,
2104 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
2105 arg, userurb_sigval);
2106}
2107
2108static int processcompl_compat(struct async *as, void __user * __user *arg)
2109{
2110 struct urb *urb = as->urb;
2111 struct usbdevfs_urb32 __user *userurb = as->userurb;
2112 void __user *addr = as->userurb;
2113 unsigned int i;
2114
2115 compute_isochronous_actual_length(urb);
2116 if (as->userbuffer && urb->actual_length) {
2117 if (copy_urb_data_to_user(as->userbuffer, urb))
2118 return -EFAULT;
2119 }
2120 if (put_user(as->status, &userurb->status))
2121 return -EFAULT;
2122 if (put_user(urb->actual_length, &userurb->actual_length))
2123 return -EFAULT;
2124 if (put_user(urb->error_count, &userurb->error_count))
2125 return -EFAULT;
2126
2127 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2128 for (i = 0; i < urb->number_of_packets; i++) {
2129 if (put_user(urb->iso_frame_desc[i].actual_length,
2130 &userurb->iso_frame_desc[i].actual_length))
2131 return -EFAULT;
2132 if (put_user(urb->iso_frame_desc[i].status,
2133 &userurb->iso_frame_desc[i].status))
2134 return -EFAULT;
2135 }
2136 }
2137
2138 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2139 return -EFAULT;
2140 return 0;
2141}
2142
2143static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
2144{
2145 struct async *as = reap_as(ps);
2146
2147 if (as) {
2148 int retval;
2149
2150 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2151 retval = processcompl_compat(as, (void __user * __user *)arg);
2152 free_async(as);
2153 return retval;
2154 }
2155 if (signal_pending(current))
2156 return -EINTR;
2157 return -ENODEV;
2158}
2159
2160static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
2161{
2162 int retval;
2163 struct async *as;
2164
2165 as = async_getcompleted(ps);
2166 if (as) {
2167 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2168 retval = processcompl_compat(as, (void __user * __user *)arg);
2169 free_async(as);
2170 } else {
2171 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2172 }
2173 return retval;
2174}
2175
2176
2177#endif
2178
2179static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
2180{
2181 struct usbdevfs_disconnectsignal ds;
2182
2183 if (copy_from_user(&ds, arg, sizeof(ds)))
2184 return -EFAULT;
2185 ps->discsignr = ds.signr;
2186 ps->disccontext.sival_ptr = ds.context;
2187 return 0;
2188}
2189
2190static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
2191{
2192 unsigned int ifnum;
2193
2194 if (get_user(ifnum, (unsigned int __user *)arg))
2195 return -EFAULT;
2196 return claimintf(ps, ifnum);
2197}
2198
2199static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
2200{
2201 unsigned int ifnum;
2202 int ret;
2203
2204 if (get_user(ifnum, (unsigned int __user *)arg))
2205 return -EFAULT;
2206 ret = releaseintf(ps, ifnum);
2207 if (ret < 0)
2208 return ret;
2209 destroy_async_on_interface(ps, ifnum);
2210 return 0;
2211}
2212
2213static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
2214{
2215 int size;
2216 void *buf = NULL;
2217 int retval = 0;
2218 struct usb_interface *intf = NULL;
2219 struct usb_driver *driver = NULL;
2220
2221 if (ps->privileges_dropped)
2222 return -EACCES;
2223
2224 if (!connected(ps))
2225 return -ENODEV;
2226
2227 /* alloc buffer */
2228 size = _IOC_SIZE(ctl->ioctl_code);
2229 if (size > 0) {
2230 buf = kmalloc(size, GFP_KERNEL);
2231 if (buf == NULL)
2232 return -ENOMEM;
2233 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2234 if (copy_from_user(buf, ctl->data, size)) {
2235 kfree(buf);
2236 return -EFAULT;
2237 }
2238 } else {
2239 memset(buf, 0, size);
2240 }
2241 }
2242
2243 if (ps->dev->state != USB_STATE_CONFIGURED)
2244 retval = -EHOSTUNREACH;
2245 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
2246 retval = -EINVAL;
2247 else switch (ctl->ioctl_code) {
2248
2249 /* disconnect kernel driver from interface */
2250 case USBDEVFS_DISCONNECT:
2251 if (intf->dev.driver) {
2252 driver = to_usb_driver(intf->dev.driver);
2253 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2254 usb_driver_release_interface(driver, intf);
2255 } else
2256 retval = -ENODATA;
2257 break;
2258
2259 /* let kernel drivers try to (re)bind to the interface */
2260 case USBDEVFS_CONNECT:
2261 if (!intf->dev.driver)
2262 retval = device_attach(&intf->dev);
2263 else
2264 retval = -EBUSY;
2265 break;
2266
2267 /* talk directly to the interface's driver */
2268 default:
2269 if (intf->dev.driver)
2270 driver = to_usb_driver(intf->dev.driver);
2271 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2272 retval = -ENOTTY;
2273 } else {
2274 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2275 if (retval == -ENOIOCTLCMD)
2276 retval = -ENOTTY;
2277 }
2278 }
2279
2280 /* cleanup and return */
2281 if (retval >= 0
2282 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2283 && size > 0
2284 && copy_to_user(ctl->data, buf, size) != 0)
2285 retval = -EFAULT;
2286
2287 kfree(buf);
2288 return retval;
2289}
2290
2291static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2292{
2293 struct usbdevfs_ioctl ctrl;
2294
2295 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2296 return -EFAULT;
2297 return proc_ioctl(ps, &ctrl);
2298}
2299
2300#ifdef CONFIG_COMPAT
2301static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2302{
2303 struct usbdevfs_ioctl32 ioc32;
2304 struct usbdevfs_ioctl ctrl;
2305
2306 if (copy_from_user(&ioc32, compat_ptr(arg), sizeof(ioc32)))
2307 return -EFAULT;
2308 ctrl.ifno = ioc32.ifno;
2309 ctrl.ioctl_code = ioc32.ioctl_code;
2310 ctrl.data = compat_ptr(ioc32.data);
2311 return proc_ioctl(ps, &ctrl);
2312}
2313#endif
2314
2315static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2316{
2317 unsigned portnum;
2318 int rc;
2319
2320 if (get_user(portnum, (unsigned __user *) arg))
2321 return -EFAULT;
2322 rc = usb_hub_claim_port(ps->dev, portnum, ps);
2323 if (rc == 0)
2324 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2325 portnum, task_pid_nr(current), current->comm);
2326 return rc;
2327}
2328
2329static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2330{
2331 unsigned portnum;
2332
2333 if (get_user(portnum, (unsigned __user *) arg))
2334 return -EFAULT;
2335 return usb_hub_release_port(ps->dev, portnum, ps);
2336}
2337
2338static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2339{
2340 __u32 caps;
2341
2342 caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2343 USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
2344 USBDEVFS_CAP_DROP_PRIVILEGES |
2345 USBDEVFS_CAP_CONNINFO_EX | MAYBE_CAP_SUSPEND;
2346 if (!ps->dev->bus->no_stop_on_short)
2347 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2348 if (ps->dev->bus->sg_tablesize)
2349 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2350
2351 if (put_user(caps, (__u32 __user *)arg))
2352 return -EFAULT;
2353
2354 return 0;
2355}
2356
2357static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2358{
2359 struct usbdevfs_disconnect_claim dc;
2360 struct usb_interface *intf;
2361
2362 if (copy_from_user(&dc, arg, sizeof(dc)))
2363 return -EFAULT;
2364
2365 intf = usb_ifnum_to_if(ps->dev, dc.interface);
2366 if (!intf)
2367 return -EINVAL;
2368
2369 if (intf->dev.driver) {
2370 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2371
2372 if (ps->privileges_dropped)
2373 return -EACCES;
2374
2375 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2376 strncmp(dc.driver, intf->dev.driver->name,
2377 sizeof(dc.driver)) != 0)
2378 return -EBUSY;
2379
2380 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2381 strncmp(dc.driver, intf->dev.driver->name,
2382 sizeof(dc.driver)) == 0)
2383 return -EBUSY;
2384
2385 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2386 usb_driver_release_interface(driver, intf);
2387 }
2388
2389 return claimintf(ps, dc.interface);
2390}
2391
2392static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2393{
2394 unsigned num_streams, num_eps;
2395 struct usb_host_endpoint **eps;
2396 struct usb_interface *intf;
2397 int r;
2398
2399 r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2400 &eps, &intf);
2401 if (r)
2402 return r;
2403
2404 destroy_async_on_interface(ps,
2405 intf->altsetting[0].desc.bInterfaceNumber);
2406
2407 r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2408 kfree(eps);
2409 return r;
2410}
2411
2412static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2413{
2414 unsigned num_eps;
2415 struct usb_host_endpoint **eps;
2416 struct usb_interface *intf;
2417 int r;
2418
2419 r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2420 if (r)
2421 return r;
2422
2423 destroy_async_on_interface(ps,
2424 intf->altsetting[0].desc.bInterfaceNumber);
2425
2426 r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2427 kfree(eps);
2428 return r;
2429}
2430
2431static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
2432{
2433 u32 data;
2434
2435 if (copy_from_user(&data, arg, sizeof(data)))
2436 return -EFAULT;
2437
2438 /* This is a one way operation. Once privileges are
2439 * dropped, you cannot regain them. You may however reissue
2440 * this ioctl to shrink the allowed interfaces mask.
2441 */
2442 ps->interface_allowed_mask &= data;
2443 ps->privileges_dropped = true;
2444
2445 return 0;
2446}
2447
2448static int proc_forbid_suspend(struct usb_dev_state *ps)
2449{
2450 int ret = 0;
2451
2452 if (ps->suspend_allowed) {
2453 ret = usb_autoresume_device(ps->dev);
2454 if (ret == 0)
2455 ps->suspend_allowed = false;
2456 else if (ret != -ENODEV)
2457 ret = -EIO;
2458 }
2459 return ret;
2460}
2461
2462static int proc_allow_suspend(struct usb_dev_state *ps)
2463{
2464 if (!connected(ps))
2465 return -ENODEV;
2466
2467 WRITE_ONCE(ps->not_yet_resumed, 1);
2468 if (!ps->suspend_allowed) {
2469 usb_autosuspend_device(ps->dev);
2470 ps->suspend_allowed = true;
2471 }
2472 return 0;
2473}
2474
2475static int proc_wait_for_resume(struct usb_dev_state *ps)
2476{
2477 int ret;
2478
2479 usb_unlock_device(ps->dev);
2480 ret = wait_event_interruptible(ps->wait_for_resume,
2481 READ_ONCE(ps->not_yet_resumed) == 0);
2482 usb_lock_device(ps->dev);
2483
2484 if (ret != 0)
2485 return -EINTR;
2486 return proc_forbid_suspend(ps);
2487}
2488
2489/*
2490 * NOTE: All requests here that have interface numbers as parameters
2491 * are assuming that somehow the configuration has been prevented from
2492 * changing. But there's no mechanism to ensure that...
2493 */
2494static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2495 void __user *p)
2496{
2497 struct usb_dev_state *ps = file->private_data;
2498 struct inode *inode = file_inode(file);
2499 struct usb_device *dev = ps->dev;
2500 int ret = -ENOTTY;
2501
2502 if (!(file->f_mode & FMODE_WRITE))
2503 return -EPERM;
2504
2505 usb_lock_device(dev);
2506
2507 /* Reap operations are allowed even after disconnection */
2508 switch (cmd) {
2509 case USBDEVFS_REAPURB:
2510 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2511 ret = proc_reapurb(ps, p);
2512 goto done;
2513
2514 case USBDEVFS_REAPURBNDELAY:
2515 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2516 ret = proc_reapurbnonblock(ps, p);
2517 goto done;
2518
2519#ifdef CONFIG_COMPAT
2520 case USBDEVFS_REAPURB32:
2521 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2522 ret = proc_reapurb_compat(ps, p);
2523 goto done;
2524
2525 case USBDEVFS_REAPURBNDELAY32:
2526 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2527 ret = proc_reapurbnonblock_compat(ps, p);
2528 goto done;
2529#endif
2530 }
2531
2532 if (!connected(ps)) {
2533 usb_unlock_device(dev);
2534 return -ENODEV;
2535 }
2536
2537 switch (cmd) {
2538 case USBDEVFS_CONTROL:
2539 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2540 ret = proc_control(ps, p);
2541 if (ret >= 0)
2542 inode->i_mtime = current_time(inode);
2543 break;
2544
2545 case USBDEVFS_BULK:
2546 snoop(&dev->dev, "%s: BULK\n", __func__);
2547 ret = proc_bulk(ps, p);
2548 if (ret >= 0)
2549 inode->i_mtime = current_time(inode);
2550 break;
2551
2552 case USBDEVFS_RESETEP:
2553 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2554 ret = proc_resetep(ps, p);
2555 if (ret >= 0)
2556 inode->i_mtime = current_time(inode);
2557 break;
2558
2559 case USBDEVFS_RESET:
2560 snoop(&dev->dev, "%s: RESET\n", __func__);
2561 ret = proc_resetdevice(ps);
2562 break;
2563
2564 case USBDEVFS_CLEAR_HALT:
2565 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2566 ret = proc_clearhalt(ps, p);
2567 if (ret >= 0)
2568 inode->i_mtime = current_time(inode);
2569 break;
2570
2571 case USBDEVFS_GETDRIVER:
2572 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2573 ret = proc_getdriver(ps, p);
2574 break;
2575
2576 case USBDEVFS_CONNECTINFO:
2577 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2578 ret = proc_connectinfo(ps, p);
2579 break;
2580
2581 case USBDEVFS_SETINTERFACE:
2582 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2583 ret = proc_setintf(ps, p);
2584 break;
2585
2586 case USBDEVFS_SETCONFIGURATION:
2587 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2588 ret = proc_setconfig(ps, p);
2589 break;
2590
2591 case USBDEVFS_SUBMITURB:
2592 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2593 ret = proc_submiturb(ps, p);
2594 if (ret >= 0)
2595 inode->i_mtime = current_time(inode);
2596 break;
2597
2598#ifdef CONFIG_COMPAT
2599 case USBDEVFS_CONTROL32:
2600 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2601 ret = proc_control_compat(ps, p);
2602 if (ret >= 0)
2603 inode->i_mtime = current_time(inode);
2604 break;
2605
2606 case USBDEVFS_BULK32:
2607 snoop(&dev->dev, "%s: BULK32\n", __func__);
2608 ret = proc_bulk_compat(ps, p);
2609 if (ret >= 0)
2610 inode->i_mtime = current_time(inode);
2611 break;
2612
2613 case USBDEVFS_DISCSIGNAL32:
2614 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2615 ret = proc_disconnectsignal_compat(ps, p);
2616 break;
2617
2618 case USBDEVFS_SUBMITURB32:
2619 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2620 ret = proc_submiturb_compat(ps, p);
2621 if (ret >= 0)
2622 inode->i_mtime = current_time(inode);
2623 break;
2624
2625 case USBDEVFS_IOCTL32:
2626 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2627 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2628 break;
2629#endif
2630
2631 case USBDEVFS_DISCARDURB:
2632 snoop(&dev->dev, "%s: DISCARDURB %px\n", __func__, p);
2633 ret = proc_unlinkurb(ps, p);
2634 break;
2635
2636 case USBDEVFS_DISCSIGNAL:
2637 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2638 ret = proc_disconnectsignal(ps, p);
2639 break;
2640
2641 case USBDEVFS_CLAIMINTERFACE:
2642 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2643 ret = proc_claiminterface(ps, p);
2644 break;
2645
2646 case USBDEVFS_RELEASEINTERFACE:
2647 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2648 ret = proc_releaseinterface(ps, p);
2649 break;
2650
2651 case USBDEVFS_IOCTL:
2652 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2653 ret = proc_ioctl_default(ps, p);
2654 break;
2655
2656 case USBDEVFS_CLAIM_PORT:
2657 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2658 ret = proc_claim_port(ps, p);
2659 break;
2660
2661 case USBDEVFS_RELEASE_PORT:
2662 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2663 ret = proc_release_port(ps, p);
2664 break;
2665 case USBDEVFS_GET_CAPABILITIES:
2666 ret = proc_get_capabilities(ps, p);
2667 break;
2668 case USBDEVFS_DISCONNECT_CLAIM:
2669 ret = proc_disconnect_claim(ps, p);
2670 break;
2671 case USBDEVFS_ALLOC_STREAMS:
2672 ret = proc_alloc_streams(ps, p);
2673 break;
2674 case USBDEVFS_FREE_STREAMS:
2675 ret = proc_free_streams(ps, p);
2676 break;
2677 case USBDEVFS_DROP_PRIVILEGES:
2678 ret = proc_drop_privileges(ps, p);
2679 break;
2680 case USBDEVFS_GET_SPEED:
2681 ret = ps->dev->speed;
2682 break;
2683 case USBDEVFS_FORBID_SUSPEND:
2684 ret = proc_forbid_suspend(ps);
2685 break;
2686 case USBDEVFS_ALLOW_SUSPEND:
2687 ret = proc_allow_suspend(ps);
2688 break;
2689 case USBDEVFS_WAIT_FOR_RESUME:
2690 ret = proc_wait_for_resume(ps);
2691 break;
2692 }
2693
2694 /* Handle variable-length commands */
2695 switch (cmd & ~IOCSIZE_MASK) {
2696 case USBDEVFS_CONNINFO_EX(0):
2697 ret = proc_conninfo_ex(ps, p, _IOC_SIZE(cmd));
2698 break;
2699 }
2700
2701 done:
2702 usb_unlock_device(dev);
2703 if (ret >= 0)
2704 inode->i_atime = current_time(inode);
2705 return ret;
2706}
2707
2708static long usbdev_ioctl(struct file *file, unsigned int cmd,
2709 unsigned long arg)
2710{
2711 int ret;
2712
2713 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2714
2715 return ret;
2716}
2717
2718/* No kernel lock - fine */
2719static __poll_t usbdev_poll(struct file *file,
2720 struct poll_table_struct *wait)
2721{
2722 struct usb_dev_state *ps = file->private_data;
2723 __poll_t mask = 0;
2724
2725 poll_wait(file, &ps->wait, wait);
2726 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2727 mask |= EPOLLOUT | EPOLLWRNORM;
2728 if (!connected(ps))
2729 mask |= EPOLLHUP;
2730 if (list_empty(&ps->list))
2731 mask |= EPOLLERR;
2732 return mask;
2733}
2734
2735const struct file_operations usbdev_file_operations = {
2736 .owner = THIS_MODULE,
2737 .llseek = no_seek_end_llseek,
2738 .read = usbdev_read,
2739 .poll = usbdev_poll,
2740 .unlocked_ioctl = usbdev_ioctl,
2741 .compat_ioctl = compat_ptr_ioctl,
2742 .mmap = usbdev_mmap,
2743 .open = usbdev_open,
2744 .release = usbdev_release,
2745};
2746
2747static void usbdev_remove(struct usb_device *udev)
2748{
2749 struct usb_dev_state *ps;
2750
2751 /* Protect against simultaneous resume */
2752 mutex_lock(&usbfs_mutex);
2753 while (!list_empty(&udev->filelist)) {
2754 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2755 destroy_all_async(ps);
2756 wake_up_all(&ps->wait);
2757 WRITE_ONCE(ps->not_yet_resumed, 0);
2758 wake_up_all(&ps->wait_for_resume);
2759 list_del_init(&ps->list);
2760 if (ps->discsignr)
2761 kill_pid_usb_asyncio(ps->discsignr, EPIPE, ps->disccontext,
2762 ps->disc_pid, ps->cred);
2763 }
2764 mutex_unlock(&usbfs_mutex);
2765}
2766
2767static int usbdev_notify(struct notifier_block *self,
2768 unsigned long action, void *dev)
2769{
2770 switch (action) {
2771 case USB_DEVICE_ADD:
2772 break;
2773 case USB_DEVICE_REMOVE:
2774 usbdev_remove(dev);
2775 break;
2776 }
2777 return NOTIFY_OK;
2778}
2779
2780static struct notifier_block usbdev_nb = {
2781 .notifier_call = usbdev_notify,
2782};
2783
2784static struct cdev usb_device_cdev;
2785
2786int __init usb_devio_init(void)
2787{
2788 int retval;
2789
2790 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2791 "usb_device");
2792 if (retval) {
2793 printk(KERN_ERR "Unable to register minors for usb_device\n");
2794 goto out;
2795 }
2796 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2797 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2798 if (retval) {
2799 printk(KERN_ERR "Unable to get usb_device major %d\n",
2800 USB_DEVICE_MAJOR);
2801 goto error_cdev;
2802 }
2803 usb_register_notify(&usbdev_nb);
2804out:
2805 return retval;
2806
2807error_cdev:
2808 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2809 goto out;
2810}
2811
2812void usb_devio_cleanup(void)
2813{
2814 usb_unregister_notify(&usbdev_nb);
2815 cdev_del(&usb_device_cdev);
2816 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2817}