1 // SPDX-License-Identifier: GPL-2.0+
2 /*****************************************************************************/
3
4 /*
5 * devio.c -- User space communication with USB devices.
6 *
7 * Copyright (C) 1999-2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
8 *
9 * This file implements the usbfs/x/y files, where
10 * x is the bus number and y the device number.
11 *
12 * It allows user space programs/"drivers" to communicate directly
13 * with USB devices without intervening kernel driver.
14 *
15 * Revision history
16 * 22.12.1999 0.1 Initial release (split from proc_usb.c)
17 * 04.01.2000 0.2 Turned into its own filesystem
18 * 30.09.2005 0.3 Fix user-triggerable oops in async URB delivery
19 * (CAN-2005-3055)
20 */
21
22 /*****************************************************************************/
23
24 #include <linux/fs.h>
25 #include <linux/mm.h>
26 #include <linux/sched/signal.h>
27 #include <linux/slab.h>
28 #include <linux/signal.h>
29 #include <linux/poll.h>
30 #include <linux/module.h>
31 #include <linux/string.h>
32 #include <linux/usb.h>
33 #include <linux/usbdevice_fs.h>
34 #include <linux/usb/hcd.h> /* for usbcore internals */
35 #include <linux/usb/quirks.h>
36 #include <linux/cdev.h>
37 #include <linux/notifier.h>
38 #include <linux/security.h>
39 #include <linux/user_namespace.h>
40 #include <linux/scatterlist.h>
41 #include <linux/uaccess.h>
42 #include <linux/dma-mapping.h>
43 #include <asm/byteorder.h>
44 #include <linux/moduleparam.h>
45
46 #include "usb.h"
47
48 #ifdef CONFIG_PM
49 #define MAYBE_CAP_SUSPEND USBDEVFS_CAP_SUSPEND
50 #else
51 #define MAYBE_CAP_SUSPEND 0
52 #endif
53
54 #define USB_MAXBUS 64
55 #define USB_DEVICE_MAX (USB_MAXBUS * 128)
56 #define USB_SG_SIZE 16384 /* split-size for large txs */
57
58 /* Mutual exclusion for ps->list in resume vs. release and remove */
59 static DEFINE_MUTEX(usbfs_mutex);
60
61 struct usb_dev_state {
62 struct list_head list; /* state list */
63 struct usb_device *dev;
64 struct file *file;
65 spinlock_t lock; /* protects the async urb lists */
66 struct list_head async_pending;
67 struct list_head async_completed;
68 struct list_head memory_list;
69 wait_queue_head_t wait; /* wake up if a request completed */
70 wait_queue_head_t wait_for_resume; /* wake up upon runtime resume */
71 unsigned int discsignr;
72 struct pid *disc_pid;
73 const struct cred *cred;
74 sigval_t disccontext;
75 unsigned long ifclaimed;
76 u32 disabled_bulk_eps;
77 unsigned long interface_allowed_mask;
78 int not_yet_resumed;
79 bool suspend_allowed;
80 bool privileges_dropped;
81 };
82
83 struct usb_memory {
84 struct list_head memlist;
85 int vma_use_count;
86 int urb_use_count;
87 u32 size;
88 void *mem;
89 dma_addr_t dma_handle;
90 unsigned long vm_start;
91 struct usb_dev_state *ps;
92 };
93
94 struct async {
95 struct list_head asynclist;
96 struct usb_dev_state *ps;
97 struct pid *pid;
98 const struct cred *cred;
99 unsigned int signr;
100 unsigned int ifnum;
101 void __user *userbuffer;
102 void __user *userurb;
103 sigval_t userurb_sigval;
104 struct urb *urb;
105 struct usb_memory *usbm;
106 unsigned int mem_usage;
107 int status;
108 u8 bulk_addr;
109 u8 bulk_status;
110 };
111
112 static bool usbfs_snoop;
113 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
114 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
115
116 static unsigned usbfs_snoop_max = 65536;
117 module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR);
118 MODULE_PARM_DESC(usbfs_snoop_max,
119 "maximum number of bytes to print while snooping");
120
121 #define snoop(dev, format, arg...) \
122 do { \
123 if (usbfs_snoop) \
124 dev_info(dev, format, ## arg); \
125 } while (0)
126
127 enum snoop_when {
128 SUBMIT, COMPLETE
129 };
130
131 #define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
132
133 /* Limit on the total amount of memory we can allocate for transfers */
134 static u32 usbfs_memory_mb = 16;
135 module_param(usbfs_memory_mb, uint, 0644);
136 MODULE_PARM_DESC(usbfs_memory_mb,
137 "maximum MB allowed for usbfs buffers (0 = no limit)");
138
139 /* Hard limit, necessary to avoid arithmetic overflow */
140 #define USBFS_XFER_MAX (UINT_MAX / 2 - 1000000)
141
142 static DEFINE_SPINLOCK(usbfs_memory_usage_lock);
143 static u64 usbfs_memory_usage; /* Total memory currently allocated */
144
145 /* Check whether it's okay to allocate more memory for a transfer */
usbfs_increase_memory_usage(u64 amount)146 static int usbfs_increase_memory_usage(u64 amount)
147 {
148 u64 lim, total_mem;
149 unsigned long flags;
150 int ret;
151
152 lim = READ_ONCE(usbfs_memory_mb);
153 lim <<= 20;
154
155 ret = 0;
156 spin_lock_irqsave(&usbfs_memory_usage_lock, flags);
157 total_mem = usbfs_memory_usage + amount;
158 if (lim > 0 && total_mem > lim)
159 ret = -ENOMEM;
160 else
161 usbfs_memory_usage = total_mem;
162 spin_unlock_irqrestore(&usbfs_memory_usage_lock, flags);
163
164 return ret;
165 }
166
167 /* Memory for a transfer is being deallocated */
usbfs_decrease_memory_usage(u64 amount)168 static void usbfs_decrease_memory_usage(u64 amount)
169 {
170 unsigned long flags;
171
172 spin_lock_irqsave(&usbfs_memory_usage_lock, flags);
173 if (amount > usbfs_memory_usage)
174 usbfs_memory_usage = 0;
175 else
176 usbfs_memory_usage -= amount;
177 spin_unlock_irqrestore(&usbfs_memory_usage_lock, flags);
178 }
179
connected(struct usb_dev_state * ps)180 static int connected(struct usb_dev_state *ps)
181 {
182 return (!list_empty(&ps->list) &&
183 ps->dev->state != USB_STATE_NOTATTACHED);
184 }
185
dec_usb_memory_use_count(struct usb_memory * usbm,int * count)186 static void dec_usb_memory_use_count(struct usb_memory *usbm, int *count)
187 {
188 struct usb_dev_state *ps = usbm->ps;
189 struct usb_hcd *hcd = bus_to_hcd(ps->dev->bus);
190 unsigned long flags;
191
192 spin_lock_irqsave(&ps->lock, flags);
193 --*count;
194 if (usbm->urb_use_count == 0 && usbm->vma_use_count == 0) {
195 list_del(&usbm->memlist);
196 spin_unlock_irqrestore(&ps->lock, flags);
197
198 hcd_buffer_free_pages(hcd, usbm->size,
199 usbm->mem, usbm->dma_handle);
200 usbfs_decrease_memory_usage(
201 usbm->size + sizeof(struct usb_memory));
202 kfree(usbm);
203 } else {
204 spin_unlock_irqrestore(&ps->lock, flags);
205 }
206 }
207
usbdev_vm_open(struct vm_area_struct * vma)208 static void usbdev_vm_open(struct vm_area_struct *vma)
209 {
210 struct usb_memory *usbm = vma->vm_private_data;
211 unsigned long flags;
212
213 spin_lock_irqsave(&usbm->ps->lock, flags);
214 ++usbm->vma_use_count;
215 spin_unlock_irqrestore(&usbm->ps->lock, flags);
216 }
217
usbdev_vm_close(struct vm_area_struct * vma)218 static void usbdev_vm_close(struct vm_area_struct *vma)
219 {
220 struct usb_memory *usbm = vma->vm_private_data;
221
222 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
223 }
224
225 static const struct vm_operations_struct usbdev_vm_ops = {
226 .open = usbdev_vm_open,
227 .close = usbdev_vm_close
228 };
229
usbdev_mmap(struct file * file,struct vm_area_struct * vma)230 static int usbdev_mmap(struct file *file, struct vm_area_struct *vma)
231 {
232 struct usb_memory *usbm = NULL;
233 struct usb_dev_state *ps = file->private_data;
234 struct usb_hcd *hcd = bus_to_hcd(ps->dev->bus);
235 size_t size = vma->vm_end - vma->vm_start;
236 void *mem;
237 unsigned long flags;
238 dma_addr_t dma_handle = DMA_MAPPING_ERROR;
239 int ret;
240
241 if (!(file->f_mode & FMODE_WRITE))
242 return -EPERM;
243
244 ret = usbfs_increase_memory_usage(size + sizeof(struct usb_memory));
245 if (ret)
246 goto error;
247
248 usbm = kzalloc_obj(struct usb_memory);
249 if (!usbm) {
250 ret = -ENOMEM;
251 goto error_decrease_mem;
252 }
253
254 mem = hcd_buffer_alloc_pages(hcd,
255 size, GFP_USER | __GFP_NOWARN, &dma_handle);
256 if (!mem) {
257 ret = -ENOMEM;
258 goto error_free_usbm;
259 }
260
261 memset(mem, 0, size);
262
263 usbm->mem = mem;
264 usbm->dma_handle = dma_handle;
265 usbm->size = size;
266 usbm->ps = ps;
267 usbm->vm_start = vma->vm_start;
268 usbm->vma_use_count = 1;
269 INIT_LIST_HEAD(&usbm->memlist);
270
271 /*
272 * In DMA-unavailable cases, hcd_buffer_alloc_pages allocates
273 * normal pages and assigns DMA_MAPPING_ERROR to dma_handle. Check
274 * whether we are in such cases, and then use remap_pfn_range (or
275 * dma_mmap_coherent) to map normal (or DMA) pages into the user
276 * space, respectively.
277 */
278 if (dma_handle == DMA_MAPPING_ERROR) {
279 if (remap_pfn_range(vma, vma->vm_start,
280 virt_to_phys(usbm->mem) >> PAGE_SHIFT,
281 size, vma->vm_page_prot) < 0) {
282 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
283 return -EAGAIN;
284 }
285 } else {
286 if (dma_mmap_coherent(hcd->self.sysdev, vma, mem, dma_handle,
287 size)) {
288 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
289 return -EAGAIN;
290 }
291 }
292
293 vm_flags_set(vma, VM_IO | VM_DONTEXPAND | VM_DONTDUMP);
294 vma->vm_ops = &usbdev_vm_ops;
295 vma->vm_private_data = usbm;
296
297 spin_lock_irqsave(&ps->lock, flags);
298 list_add_tail(&usbm->memlist, &ps->memory_list);
299 spin_unlock_irqrestore(&ps->lock, flags);
300
301 return 0;
302
303 error_free_usbm:
304 kfree(usbm);
305 error_decrease_mem:
306 usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
307 error:
308 return ret;
309 }
310
usbdev_read(struct file * file,char __user * buf,size_t nbytes,loff_t * ppos)311 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
312 loff_t *ppos)
313 {
314 struct usb_dev_state *ps = file->private_data;
315 struct usb_device *dev = ps->dev;
316 ssize_t ret = 0;
317 unsigned len;
318 loff_t pos;
319 int i;
320
321 pos = *ppos;
322 usb_lock_device(dev);
323 if (!connected(ps)) {
324 ret = -ENODEV;
325 goto err;
326 } else if (pos < 0) {
327 ret = -EINVAL;
328 goto err;
329 }
330
331 if (pos < sizeof(struct usb_device_descriptor)) {
332 /* 18 bytes - fits on the stack */
333 struct usb_device_descriptor temp_desc;
334
335 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
336 le16_to_cpus(&temp_desc.bcdUSB);
337 le16_to_cpus(&temp_desc.idVendor);
338 le16_to_cpus(&temp_desc.idProduct);
339 le16_to_cpus(&temp_desc.bcdDevice);
340
341 len = sizeof(struct usb_device_descriptor) - pos;
342 if (len > nbytes)
343 len = nbytes;
344 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
345 ret = -EFAULT;
346 goto err;
347 }
348
349 *ppos += len;
350 buf += len;
351 nbytes -= len;
352 ret += len;
353 }
354
355 pos = sizeof(struct usb_device_descriptor);
356 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
357 struct usb_config_descriptor *config =
358 (struct usb_config_descriptor *)dev->rawdescriptors[i];
359 unsigned int length = le16_to_cpu(config->wTotalLength);
360
361 if (*ppos < pos + length) {
362
363 /* The descriptor may claim to be longer than it
364 * really is. Here is the actual allocated length. */
365 unsigned alloclen =
366 le16_to_cpu(dev->config[i].desc.wTotalLength);
367
368 len = length - (*ppos - pos);
369 if (len > nbytes)
370 len = nbytes;
371
372 /* Simply don't write (skip over) unallocated parts */
373 if (alloclen > (*ppos - pos)) {
374 alloclen -= (*ppos - pos);
375 if (copy_to_user(buf,
376 dev->rawdescriptors[i] + (*ppos - pos),
377 min(len, alloclen))) {
378 ret = -EFAULT;
379 goto err;
380 }
381 }
382
383 *ppos += len;
384 buf += len;
385 nbytes -= len;
386 ret += len;
387 }
388
389 pos += length;
390 }
391
392 err:
393 usb_unlock_device(dev);
394 return ret;
395 }
396
397 /*
398 * async list handling
399 */
400
alloc_async(unsigned int numisoframes)401 static struct async *alloc_async(unsigned int numisoframes)
402 {
403 struct async *as;
404
405 as = kzalloc_obj(struct async);
406 if (!as)
407 return NULL;
408 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
409 if (!as->urb) {
410 kfree(as);
411 return NULL;
412 }
413 return as;
414 }
415
free_async(struct async * as)416 static void free_async(struct async *as)
417 {
418 int i;
419
420 put_pid(as->pid);
421 if (as->cred)
422 put_cred(as->cred);
423 for (i = 0; i < as->urb->num_sgs; i++) {
424 if (sg_page(&as->urb->sg[i]))
425 kfree(sg_virt(&as->urb->sg[i]));
426 }
427
428 kfree(as->urb->sg);
429 if (as->usbm == NULL)
430 kfree(as->urb->transfer_buffer);
431 else
432 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
433
434 kfree(as->urb->setup_packet);
435 usb_free_urb(as->urb);
436 usbfs_decrease_memory_usage(as->mem_usage);
437 kfree(as);
438 }
439
async_newpending(struct async * as)440 static void async_newpending(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_add_tail(&as->asynclist, &ps->async_pending);
447 spin_unlock_irqrestore(&ps->lock, flags);
448 }
449
async_removepending(struct async * as)450 static void async_removepending(struct async *as)
451 {
452 struct usb_dev_state *ps = as->ps;
453 unsigned long flags;
454
455 spin_lock_irqsave(&ps->lock, flags);
456 list_del_init(&as->asynclist);
457 spin_unlock_irqrestore(&ps->lock, flags);
458 }
459
async_getcompleted(struct usb_dev_state * ps)460 static struct async *async_getcompleted(struct usb_dev_state *ps)
461 {
462 unsigned long flags;
463 struct async *as = NULL;
464
465 spin_lock_irqsave(&ps->lock, flags);
466 if (!list_empty(&ps->async_completed)) {
467 as = list_entry(ps->async_completed.next, struct async,
468 asynclist);
469 list_del_init(&as->asynclist);
470 }
471 spin_unlock_irqrestore(&ps->lock, flags);
472 return as;
473 }
474
async_getpending(struct usb_dev_state * ps,void __user * userurb)475 static struct async *async_getpending(struct usb_dev_state *ps,
476 void __user *userurb)
477 {
478 struct async *as;
479
480 list_for_each_entry(as, &ps->async_pending, asynclist)
481 if (as->userurb == userurb) {
482 list_del_init(&as->asynclist);
483 return as;
484 }
485
486 return NULL;
487 }
488
snoop_urb(struct usb_device * udev,void __user * userurb,int pipe,unsigned length,int timeout_or_status,enum snoop_when when,unsigned char * data,unsigned data_len)489 static void snoop_urb(struct usb_device *udev,
490 void __user *userurb, int pipe, unsigned length,
491 int timeout_or_status, enum snoop_when when,
492 unsigned char *data, unsigned data_len)
493 {
494 static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
495 static const char *dirs[] = {"out", "in"};
496 int ep;
497 const char *t, *d;
498
499 if (!usbfs_snoop)
500 return;
501
502 ep = usb_pipeendpoint(pipe);
503 t = types[usb_pipetype(pipe)];
504 d = dirs[!!usb_pipein(pipe)];
505
506 if (userurb) { /* Async */
507 if (when == SUBMIT)
508 dev_info(&udev->dev, "userurb %px, ep%d %s-%s, "
509 "length %u\n",
510 userurb, ep, t, d, length);
511 else
512 dev_info(&udev->dev, "userurb %px, ep%d %s-%s, "
513 "actual_length %u status %d\n",
514 userurb, ep, t, d, length,
515 timeout_or_status);
516 } else {
517 if (when == SUBMIT)
518 dev_info(&udev->dev, "ep%d %s-%s, length %u, "
519 "timeout %d\n",
520 ep, t, d, length, timeout_or_status);
521 else
522 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
523 "status %d\n",
524 ep, t, d, length, timeout_or_status);
525 }
526
527 data_len = min(data_len, usbfs_snoop_max);
528 if (data && data_len > 0) {
529 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
530 data, data_len, 1);
531 }
532 }
533
snoop_urb_data(struct urb * urb,unsigned len)534 static void snoop_urb_data(struct urb *urb, unsigned len)
535 {
536 int i, size;
537
538 len = min(len, usbfs_snoop_max);
539 if (!usbfs_snoop || len == 0)
540 return;
541
542 if (urb->num_sgs == 0) {
543 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
544 urb->transfer_buffer, len, 1);
545 return;
546 }
547
548 for (i = 0; i < urb->num_sgs && len; i++) {
549 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
550 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
551 sg_virt(&urb->sg[i]), size, 1);
552 len -= size;
553 }
554 }
555
copy_urb_data_to_user(u8 __user * userbuffer,struct urb * urb)556 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
557 {
558 unsigned i, len, size;
559
560 if (urb->number_of_packets > 0) /* Isochronous */
561 len = urb->transfer_buffer_length;
562 else /* Non-Isoc */
563 len = urb->actual_length;
564
565 if (urb->num_sgs == 0) {
566 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
567 return -EFAULT;
568 return 0;
569 }
570
571 for (i = 0; i < urb->num_sgs && len; i++) {
572 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
573 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
574 return -EFAULT;
575 userbuffer += size;
576 len -= size;
577 }
578
579 return 0;
580 }
581
582 #define AS_CONTINUATION 1
583 #define AS_UNLINK 2
584
cancel_bulk_urbs(struct usb_dev_state * ps,unsigned bulk_addr)585 static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
586 __releases(ps->lock)
587 __acquires(ps->lock)
588 {
589 struct urb *urb;
590 struct async *as;
591
592 /* Mark all the pending URBs that match bulk_addr, up to but not
593 * including the first one without AS_CONTINUATION. If such an
594 * URB is encountered then a new transfer has already started so
595 * the endpoint doesn't need to be disabled; otherwise it does.
596 */
597 list_for_each_entry(as, &ps->async_pending, asynclist) {
598 if (as->bulk_addr == bulk_addr) {
599 if (as->bulk_status != AS_CONTINUATION)
600 goto rescan;
601 as->bulk_status = AS_UNLINK;
602 as->bulk_addr = 0;
603 }
604 }
605 ps->disabled_bulk_eps |= (1 << bulk_addr);
606
607 /* Now carefully unlink all the marked pending URBs */
608 rescan:
609 list_for_each_entry_reverse(as, &ps->async_pending, asynclist) {
610 if (as->bulk_status == AS_UNLINK) {
611 as->bulk_status = 0; /* Only once */
612 urb = as->urb;
613 usb_get_urb(urb);
614 spin_unlock(&ps->lock); /* Allow completions */
615 usb_unlink_urb(urb);
616 usb_put_urb(urb);
617 spin_lock(&ps->lock);
618 goto rescan;
619 }
620 }
621 }
622
async_completed(struct urb * urb)623 static void async_completed(struct urb *urb)
624 {
625 struct async *as = urb->context;
626 struct usb_dev_state *ps = as->ps;
627 struct pid *pid = NULL;
628 const struct cred *cred = NULL;
629 unsigned long flags;
630 sigval_t addr;
631 int signr, errno;
632
633 spin_lock_irqsave(&ps->lock, flags);
634 list_move_tail(&as->asynclist, &ps->async_completed);
635 as->status = urb->status;
636 signr = as->signr;
637 if (signr) {
638 errno = as->status;
639 addr = as->userurb_sigval;
640 pid = get_pid(as->pid);
641 cred = get_cred(as->cred);
642 }
643 snoop(&urb->dev->dev, "urb complete\n");
644 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
645 as->status, COMPLETE, NULL, 0);
646 if (usb_urb_dir_in(urb))
647 snoop_urb_data(urb, urb->actual_length);
648
649 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
650 as->status != -ENOENT)
651 cancel_bulk_urbs(ps, as->bulk_addr);
652
653 wake_up(&ps->wait);
654 spin_unlock_irqrestore(&ps->lock, flags);
655
656 if (signr) {
657 kill_pid_usb_asyncio(signr, errno, addr, pid, cred);
658 put_pid(pid);
659 put_cred(cred);
660 }
661 }
662
destroy_async(struct usb_dev_state * ps,struct list_head * list)663 static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
664 {
665 struct urb *urb;
666 struct async *as;
667 unsigned long flags;
668
669 spin_lock_irqsave(&ps->lock, flags);
670 while (!list_empty(list)) {
671 as = list_last_entry(list, struct async, asynclist);
672 list_del_init(&as->asynclist);
673 urb = as->urb;
674 usb_get_urb(urb);
675
676 /* drop the spinlock so the completion handler can run */
677 spin_unlock_irqrestore(&ps->lock, flags);
678 usb_kill_urb(urb);
679 usb_put_urb(urb);
680 spin_lock_irqsave(&ps->lock, flags);
681 }
682 spin_unlock_irqrestore(&ps->lock, flags);
683 }
684
destroy_async_on_interface(struct usb_dev_state * ps,unsigned int ifnum)685 static void destroy_async_on_interface(struct usb_dev_state *ps,
686 unsigned int ifnum)
687 {
688 struct list_head *p, *q, hitlist;
689 unsigned long flags;
690
691 INIT_LIST_HEAD(&hitlist);
692 spin_lock_irqsave(&ps->lock, flags);
693 list_for_each_safe(p, q, &ps->async_pending)
694 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
695 list_move_tail(p, &hitlist);
696 spin_unlock_irqrestore(&ps->lock, flags);
697 destroy_async(ps, &hitlist);
698 }
699
destroy_all_async(struct usb_dev_state * ps)700 static void destroy_all_async(struct usb_dev_state *ps)
701 {
702 destroy_async(ps, &ps->async_pending);
703 }
704
705 /*
706 * interface claims are made only at the request of user level code,
707 * which can also release them (explicitly or by closing files).
708 * they're also undone when devices disconnect.
709 */
710
driver_probe(struct usb_interface * intf,const struct usb_device_id * id)711 static int driver_probe(struct usb_interface *intf,
712 const struct usb_device_id *id)
713 {
714 return -ENODEV;
715 }
716
driver_disconnect(struct usb_interface * intf)717 static void driver_disconnect(struct usb_interface *intf)
718 {
719 struct usb_dev_state *ps = usb_get_intfdata(intf);
720 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
721
722 if (!ps)
723 return;
724
725 /* NOTE: this relies on usbcore having canceled and completed
726 * all pending I/O requests; 2.6 does that.
727 */
728
729 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
730 clear_bit(ifnum, &ps->ifclaimed);
731 else
732 dev_warn(&intf->dev, "interface number %u out of range\n",
733 ifnum);
734
735 usb_set_intfdata(intf, NULL);
736
737 /* force async requests to complete */
738 destroy_async_on_interface(ps, ifnum);
739 }
740
741 /* We don't care about suspend/resume of claimed interfaces */
driver_suspend(struct usb_interface * intf,pm_message_t msg)742 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
743 {
744 return 0;
745 }
746
driver_resume(struct usb_interface * intf)747 static int driver_resume(struct usb_interface *intf)
748 {
749 return 0;
750 }
751
752 #ifdef CONFIG_PM
753 /* The following routines apply to the entire device, not interfaces */
usbfs_notify_suspend(struct usb_device * udev)754 void usbfs_notify_suspend(struct usb_device *udev)
755 {
756 /* We don't need to handle this */
757 }
758
usbfs_notify_resume(struct usb_device * udev)759 void usbfs_notify_resume(struct usb_device *udev)
760 {
761 struct usb_dev_state *ps;
762
763 /* Protect against simultaneous remove or release */
764 mutex_lock(&usbfs_mutex);
765 list_for_each_entry(ps, &udev->filelist, list) {
766 WRITE_ONCE(ps->not_yet_resumed, 0);
767 wake_up_all(&ps->wait_for_resume);
768 }
769 mutex_unlock(&usbfs_mutex);
770 }
771 #endif
772
773 struct usb_driver usbfs_driver = {
774 .name = "usbfs",
775 .probe = driver_probe,
776 .disconnect = driver_disconnect,
777 .suspend = driver_suspend,
778 .resume = driver_resume,
779 .supports_autosuspend = 1,
780 };
781
claimintf(struct usb_dev_state * ps,unsigned int ifnum)782 static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
783 {
784 struct usb_device *dev = ps->dev;
785 struct usb_interface *intf;
786 int err;
787
788 if (ifnum >= 8*sizeof(ps->ifclaimed))
789 return -EINVAL;
790 /* already claimed */
791 if (test_bit(ifnum, &ps->ifclaimed))
792 return 0;
793
794 if (ps->privileges_dropped &&
795 !test_bit(ifnum, &ps->interface_allowed_mask))
796 return -EACCES;
797
798 intf = usb_ifnum_to_if(dev, ifnum);
799 if (!intf)
800 err = -ENOENT;
801 else {
802 unsigned int old_suppress;
803
804 /* suppress uevents while claiming interface */
805 old_suppress = dev_get_uevent_suppress(&intf->dev);
806 dev_set_uevent_suppress(&intf->dev, 1);
807 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
808 dev_set_uevent_suppress(&intf->dev, old_suppress);
809 }
810 if (err == 0)
811 set_bit(ifnum, &ps->ifclaimed);
812 return err;
813 }
814
releaseintf(struct usb_dev_state * ps,unsigned int ifnum)815 static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
816 {
817 struct usb_device *dev;
818 struct usb_interface *intf;
819 int err;
820
821 err = -EINVAL;
822 if (ifnum >= 8*sizeof(ps->ifclaimed))
823 return err;
824 dev = ps->dev;
825 intf = usb_ifnum_to_if(dev, ifnum);
826 if (!intf)
827 err = -ENOENT;
828 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
829 unsigned int old_suppress;
830
831 /* suppress uevents while releasing interface */
832 old_suppress = dev_get_uevent_suppress(&intf->dev);
833 dev_set_uevent_suppress(&intf->dev, 1);
834 usb_driver_release_interface(&usbfs_driver, intf);
835 dev_set_uevent_suppress(&intf->dev, old_suppress);
836 err = 0;
837 }
838 return err;
839 }
840
checkintf(struct usb_dev_state * ps,unsigned int ifnum)841 static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
842 {
843 if (ps->dev->state != USB_STATE_CONFIGURED)
844 return -EHOSTUNREACH;
845 if (ifnum >= 8*sizeof(ps->ifclaimed))
846 return -EINVAL;
847 if (test_bit(ifnum, &ps->ifclaimed))
848 return 0;
849 /* if not yet claimed, claim it for the driver */
850 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
851 "interface %u before use\n", task_pid_nr(current),
852 current->comm, ifnum);
853 return claimintf(ps, ifnum);
854 }
855
findintfep(struct usb_device * dev,unsigned int ep)856 static int findintfep(struct usb_device *dev, unsigned int ep)
857 {
858 unsigned int i, j, e;
859 struct usb_interface *intf;
860 struct usb_host_interface *alts;
861 struct usb_endpoint_descriptor *endpt;
862
863 if (ep & ~(USB_DIR_IN|0xf))
864 return -EINVAL;
865 if (!dev->actconfig)
866 return -ESRCH;
867 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
868 intf = dev->actconfig->interface[i];
869 for (j = 0; j < intf->num_altsetting; j++) {
870 alts = &intf->altsetting[j];
871 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
872 endpt = &alts->endpoint[e].desc;
873 if (endpt->bEndpointAddress == ep)
874 return alts->desc.bInterfaceNumber;
875 }
876 }
877 }
878 return -ENOENT;
879 }
880
check_ctrlrecip(struct usb_dev_state * ps,unsigned int requesttype,unsigned int request,unsigned int index)881 static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
882 unsigned int request, unsigned int index)
883 {
884 int ret = 0;
885 struct usb_host_interface *alt_setting;
886
887 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
888 && ps->dev->state != USB_STATE_ADDRESS
889 && ps->dev->state != USB_STATE_CONFIGURED)
890 return -EHOSTUNREACH;
891 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
892 return 0;
893
894 /*
895 * check for the special corner case 'get_device_id' in the printer
896 * class specification, which we always want to allow as it is used
897 * to query things like ink level, etc.
898 */
899 if (requesttype == 0xa1 && request == 0) {
900 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
901 index >> 8, index & 0xff);
902 if (alt_setting
903 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
904 return 0;
905 }
906
907 index &= 0xff;
908 switch (requesttype & USB_RECIP_MASK) {
909 case USB_RECIP_ENDPOINT:
910 if ((index & ~USB_DIR_IN) == 0)
911 return 0;
912 ret = findintfep(ps->dev, index);
913 if (ret < 0) {
914 /*
915 * Some not fully compliant Win apps seem to get
916 * index wrong and have the endpoint number here
917 * rather than the endpoint address (with the
918 * correct direction). Win does let this through,
919 * so we'll not reject it here but leave it to
920 * the device to not break KVM. But we warn.
921 */
922 ret = findintfep(ps->dev, index ^ 0x80);
923 if (ret >= 0)
924 dev_info(&ps->dev->dev,
925 "%s: process %i (%s) requesting ep %02x but needs %02x\n",
926 __func__, task_pid_nr(current),
927 current->comm, index, index ^ 0x80);
928 }
929 if (ret >= 0)
930 ret = checkintf(ps, ret);
931 break;
932
933 case USB_RECIP_INTERFACE:
934 ret = checkintf(ps, index);
935 break;
936 }
937 return ret;
938 }
939
ep_to_host_endpoint(struct usb_device * dev,unsigned char ep)940 static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
941 unsigned char ep)
942 {
943 if (ep & USB_ENDPOINT_DIR_MASK)
944 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
945 else
946 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
947 }
948
parse_usbdevfs_streams(struct usb_dev_state * ps,struct usbdevfs_streams __user * streams,unsigned int * num_streams_ret,unsigned int * num_eps_ret,struct usb_host_endpoint *** eps_ret,struct usb_interface ** intf_ret)949 static int parse_usbdevfs_streams(struct usb_dev_state *ps,
950 struct usbdevfs_streams __user *streams,
951 unsigned int *num_streams_ret,
952 unsigned int *num_eps_ret,
953 struct usb_host_endpoint ***eps_ret,
954 struct usb_interface **intf_ret)
955 {
956 unsigned int i, num_streams, num_eps;
957 struct usb_host_endpoint **eps;
958 struct usb_interface *intf = NULL;
959 unsigned char ep;
960 int ifnum, ret;
961
962 if (get_user(num_streams, &streams->num_streams) ||
963 get_user(num_eps, &streams->num_eps))
964 return -EFAULT;
965
966 if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
967 return -EINVAL;
968
969 /* The XHCI controller allows max 2 ^ 16 streams */
970 if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
971 return -EINVAL;
972
973 eps = kmalloc_objs(*eps, num_eps);
974 if (!eps)
975 return -ENOMEM;
976
977 for (i = 0; i < num_eps; i++) {
978 if (get_user(ep, &streams->eps[i])) {
979 ret = -EFAULT;
980 goto error;
981 }
982 eps[i] = ep_to_host_endpoint(ps->dev, ep);
983 if (!eps[i]) {
984 ret = -EINVAL;
985 goto error;
986 }
987
988 /* usb_alloc/free_streams operate on an usb_interface */
989 ifnum = findintfep(ps->dev, ep);
990 if (ifnum < 0) {
991 ret = ifnum;
992 goto error;
993 }
994
995 if (i == 0) {
996 ret = checkintf(ps, ifnum);
997 if (ret < 0)
998 goto error;
999 intf = usb_ifnum_to_if(ps->dev, ifnum);
1000 } else {
1001 /* Verify all eps belong to the same interface */
1002 if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
1003 ret = -EINVAL;
1004 goto error;
1005 }
1006 }
1007 }
1008
1009 if (num_streams_ret)
1010 *num_streams_ret = num_streams;
1011 *num_eps_ret = num_eps;
1012 *eps_ret = eps;
1013 *intf_ret = intf;
1014
1015 return 0;
1016
1017 error:
1018 kfree(eps);
1019 return ret;
1020 }
1021
usbdev_lookup_by_devt(dev_t devt)1022 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
1023 {
1024 struct device *dev;
1025
1026 dev = bus_find_device_by_devt(&usb_bus_type, devt);
1027 if (!dev)
1028 return NULL;
1029 return to_usb_device(dev);
1030 }
1031
1032 /*
1033 * file operations
1034 */
usbdev_open(struct inode * inode,struct file * file)1035 static int usbdev_open(struct inode *inode, struct file *file)
1036 {
1037 struct usb_device *dev = NULL;
1038 struct usb_dev_state *ps;
1039 int ret;
1040
1041 ret = -ENOMEM;
1042 ps = kzalloc_obj(struct usb_dev_state);
1043 if (!ps)
1044 goto out_free_ps;
1045
1046 ret = -ENODEV;
1047
1048 /* usbdev device-node */
1049 if (imajor(inode) == USB_DEVICE_MAJOR)
1050 dev = usbdev_lookup_by_devt(inode->i_rdev);
1051 if (!dev)
1052 goto out_free_ps;
1053
1054 usb_lock_device(dev);
1055 if (dev->state == USB_STATE_NOTATTACHED)
1056 goto out_unlock_device;
1057
1058 ret = usb_autoresume_device(dev);
1059 if (ret)
1060 goto out_unlock_device;
1061
1062 ps->dev = dev;
1063 ps->file = file;
1064 ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
1065 spin_lock_init(&ps->lock);
1066 INIT_LIST_HEAD(&ps->list);
1067 INIT_LIST_HEAD(&ps->async_pending);
1068 INIT_LIST_HEAD(&ps->async_completed);
1069 INIT_LIST_HEAD(&ps->memory_list);
1070 init_waitqueue_head(&ps->wait);
1071 init_waitqueue_head(&ps->wait_for_resume);
1072 ps->disc_pid = get_pid(task_pid(current));
1073 ps->cred = get_current_cred();
1074 smp_wmb();
1075
1076 /* Can't race with resume; the device is already active */
1077 list_add_tail(&ps->list, &dev->filelist);
1078 file->private_data = ps;
1079 usb_unlock_device(dev);
1080 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
1081 current->comm);
1082 return ret;
1083
1084 out_unlock_device:
1085 usb_unlock_device(dev);
1086 usb_put_dev(dev);
1087 out_free_ps:
1088 kfree(ps);
1089 return ret;
1090 }
1091
usbdev_release(struct inode * inode,struct file * file)1092 static int usbdev_release(struct inode *inode, struct file *file)
1093 {
1094 struct usb_dev_state *ps = file->private_data;
1095 struct usb_device *dev = ps->dev;
1096 unsigned int ifnum;
1097 struct async *as;
1098
1099 usb_lock_device(dev);
1100 usb_hub_release_all_ports(dev, ps);
1101
1102 /* Protect against simultaneous resume */
1103 mutex_lock(&usbfs_mutex);
1104 list_del_init(&ps->list);
1105 mutex_unlock(&usbfs_mutex);
1106
1107 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
1108 ifnum++) {
1109 if (test_bit(ifnum, &ps->ifclaimed))
1110 releaseintf(ps, ifnum);
1111 }
1112 destroy_all_async(ps);
1113 if (!ps->suspend_allowed)
1114 usb_autosuspend_device(dev);
1115 usb_unlock_device(dev);
1116 usb_put_dev(dev);
1117 put_pid(ps->disc_pid);
1118 put_cred(ps->cred);
1119
1120 as = async_getcompleted(ps);
1121 while (as) {
1122 free_async(as);
1123 as = async_getcompleted(ps);
1124 }
1125
1126 kfree(ps);
1127 return 0;
1128 }
1129
usbfs_blocking_completion(struct urb * urb)1130 static void usbfs_blocking_completion(struct urb *urb)
1131 {
1132 complete((struct completion *) urb->context);
1133 }
1134
1135 /*
1136 * Much like usb_start_wait_urb, but returns status separately from
1137 * actual_length and uses a killable wait.
1138 */
usbfs_start_wait_urb(struct urb * urb,int timeout,unsigned int * actlen)1139 static int usbfs_start_wait_urb(struct urb *urb, int timeout,
1140 unsigned int *actlen)
1141 {
1142 DECLARE_COMPLETION_ONSTACK(ctx);
1143 unsigned long expire;
1144 int rc;
1145
1146 urb->context = &ctx;
1147 urb->complete = usbfs_blocking_completion;
1148 *actlen = 0;
1149 rc = usb_submit_urb(urb, GFP_KERNEL);
1150 if (unlikely(rc))
1151 return rc;
1152
1153 expire = (timeout ? msecs_to_jiffies(timeout) : MAX_SCHEDULE_TIMEOUT);
1154 rc = wait_for_completion_killable_timeout(&ctx, expire);
1155 if (rc <= 0) {
1156 usb_kill_urb(urb);
1157 *actlen = urb->actual_length;
1158 if (urb->status != -ENOENT)
1159 ; /* Completed before it was killed */
1160 else if (rc < 0)
1161 return -EINTR;
1162 else
1163 return -ETIMEDOUT;
1164 }
1165 *actlen = urb->actual_length;
1166 return urb->status;
1167 }
1168
do_proc_control(struct usb_dev_state * ps,struct usbdevfs_ctrltransfer * ctrl)1169 static int do_proc_control(struct usb_dev_state *ps,
1170 struct usbdevfs_ctrltransfer *ctrl)
1171 {
1172 struct usb_device *dev = ps->dev;
1173 unsigned int tmo;
1174 unsigned char *tbuf;
1175 unsigned int wLength, actlen;
1176 int i, pipe, ret;
1177 struct urb *urb = NULL;
1178 struct usb_ctrlrequest *dr = NULL;
1179
1180 ret = check_ctrlrecip(ps, ctrl->bRequestType, ctrl->bRequest,
1181 ctrl->wIndex);
1182 if (ret)
1183 return ret;
1184 wLength = ctrl->wLength; /* To suppress 64k PAGE_SIZE warning */
1185 if (wLength > PAGE_SIZE)
1186 return -EINVAL;
1187 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1188 sizeof(struct usb_ctrlrequest));
1189 if (ret)
1190 return ret;
1191
1192 ret = -ENOMEM;
1193 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1194 if (!tbuf)
1195 goto done;
1196 urb = usb_alloc_urb(0, GFP_NOIO);
1197 if (!urb)
1198 goto done;
1199 dr = kmalloc_obj(struct usb_ctrlrequest, GFP_NOIO);
1200 if (!dr)
1201 goto done;
1202
1203 dr->bRequestType = ctrl->bRequestType;
1204 dr->bRequest = ctrl->bRequest;
1205 dr->wValue = cpu_to_le16(ctrl->wValue);
1206 dr->wIndex = cpu_to_le16(ctrl->wIndex);
1207 dr->wLength = cpu_to_le16(ctrl->wLength);
1208
1209 tmo = ctrl->timeout;
1210 snoop(&dev->dev, "control urb: bRequestType=%02x "
1211 "bRequest=%02x wValue=%04x "
1212 "wIndex=%04x wLength=%04x\n",
1213 ctrl->bRequestType, ctrl->bRequest, ctrl->wValue,
1214 ctrl->wIndex, ctrl->wLength);
1215
1216 if ((ctrl->bRequestType & USB_DIR_IN) && wLength) {
1217 pipe = usb_rcvctrlpipe(dev, 0);
1218 usb_fill_control_urb(urb, dev, pipe, (unsigned char *) dr, tbuf,
1219 wLength, NULL, NULL);
1220 snoop_urb(dev, NULL, pipe, wLength, tmo, SUBMIT, NULL, 0);
1221
1222 usb_unlock_device(dev);
1223 i = usbfs_start_wait_urb(urb, tmo, &actlen);
1224
1225 /* Linger a bit, prior to the next control message. */
1226 if (dev->quirks & USB_QUIRK_DELAY_CTRL_MSG)
1227 msleep(200);
1228 usb_lock_device(dev);
1229 snoop_urb(dev, NULL, pipe, actlen, i, COMPLETE, tbuf, actlen);
1230 if (!i && actlen) {
1231 if (copy_to_user(ctrl->data, tbuf, actlen)) {
1232 ret = -EFAULT;
1233 goto done;
1234 }
1235 }
1236 } else {
1237 if (wLength) {
1238 if (copy_from_user(tbuf, ctrl->data, wLength)) {
1239 ret = -EFAULT;
1240 goto done;
1241 }
1242 }
1243 pipe = usb_sndctrlpipe(dev, 0);
1244 usb_fill_control_urb(urb, dev, pipe, (unsigned char *) dr, tbuf,
1245 wLength, NULL, NULL);
1246 snoop_urb(dev, NULL, pipe, wLength, tmo, SUBMIT, tbuf, wLength);
1247
1248 usb_unlock_device(dev);
1249 i = usbfs_start_wait_urb(urb, tmo, &actlen);
1250
1251 /* Linger a bit, prior to the next control message. */
1252 if (dev->quirks & USB_QUIRK_DELAY_CTRL_MSG)
1253 msleep(200);
1254 usb_lock_device(dev);
1255 snoop_urb(dev, NULL, pipe, actlen, i, COMPLETE, NULL, 0);
1256 }
1257 if (i < 0 && i != -EPIPE) {
1258 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1259 "failed cmd %s rqt %u rq %u len %u ret %d\n",
1260 current->comm, ctrl->bRequestType, ctrl->bRequest,
1261 ctrl->wLength, i);
1262 }
1263 ret = (i < 0 ? i : actlen);
1264
1265 done:
1266 kfree(dr);
1267 usb_free_urb(urb);
1268 free_page((unsigned long) tbuf);
1269 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1270 sizeof(struct usb_ctrlrequest));
1271 return ret;
1272 }
1273
proc_control(struct usb_dev_state * ps,void __user * arg)1274 static int proc_control(struct usb_dev_state *ps, void __user *arg)
1275 {
1276 struct usbdevfs_ctrltransfer ctrl;
1277
1278 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1279 return -EFAULT;
1280 return do_proc_control(ps, &ctrl);
1281 }
1282
do_proc_bulk(struct usb_dev_state * ps,struct usbdevfs_bulktransfer * bulk)1283 static int do_proc_bulk(struct usb_dev_state *ps,
1284 struct usbdevfs_bulktransfer *bulk)
1285 {
1286 struct usb_device *dev = ps->dev;
1287 unsigned int tmo, len1, len2, pipe;
1288 unsigned char *tbuf;
1289 int i, ret;
1290 struct urb *urb = NULL;
1291 struct usb_host_endpoint *ep;
1292
1293 ret = findintfep(ps->dev, bulk->ep);
1294 if (ret < 0)
1295 return ret;
1296 ret = checkintf(ps, ret);
1297 if (ret)
1298 return ret;
1299
1300 len1 = bulk->len;
1301 if (len1 >= (INT_MAX - sizeof(struct urb)))
1302 return -EINVAL;
1303
1304 if (bulk->ep & USB_DIR_IN)
1305 pipe = usb_rcvbulkpipe(dev, bulk->ep & 0x7f);
1306 else
1307 pipe = usb_sndbulkpipe(dev, bulk->ep & 0x7f);
1308 ep = usb_pipe_endpoint(dev, pipe);
1309 if (!ep || !usb_endpoint_maxp(&ep->desc))
1310 return -EINVAL;
1311 ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1312 if (ret)
1313 return ret;
1314
1315 /*
1316 * len1 can be almost arbitrarily large. Don't WARN if it's
1317 * too big, just fail the request.
1318 */
1319 ret = -ENOMEM;
1320 tbuf = kmalloc(len1, GFP_KERNEL | __GFP_NOWARN);
1321 if (!tbuf)
1322 goto done;
1323 urb = usb_alloc_urb(0, GFP_KERNEL);
1324 if (!urb)
1325 goto done;
1326
1327 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
1328 USB_ENDPOINT_XFER_INT) {
1329 pipe = (pipe & ~(3 << 30)) | (PIPE_INTERRUPT << 30);
1330 usb_fill_int_urb(urb, dev, pipe, tbuf, len1,
1331 NULL, NULL, ep->desc.bInterval);
1332 } else {
1333 usb_fill_bulk_urb(urb, dev, pipe, tbuf, len1, NULL, NULL);
1334 }
1335
1336 tmo = bulk->timeout;
1337 if (bulk->ep & 0x80) {
1338 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1339
1340 usb_unlock_device(dev);
1341 i = usbfs_start_wait_urb(urb, tmo, &len2);
1342 usb_lock_device(dev);
1343 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1344
1345 if (!i && len2) {
1346 if (copy_to_user(bulk->data, tbuf, len2)) {
1347 ret = -EFAULT;
1348 goto done;
1349 }
1350 }
1351 } else {
1352 if (len1) {
1353 if (copy_from_user(tbuf, bulk->data, len1)) {
1354 ret = -EFAULT;
1355 goto done;
1356 }
1357 }
1358 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1359
1360 usb_unlock_device(dev);
1361 i = usbfs_start_wait_urb(urb, tmo, &len2);
1362 usb_lock_device(dev);
1363 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1364 }
1365 ret = (i < 0 ? i : len2);
1366 done:
1367 usb_free_urb(urb);
1368 kfree(tbuf);
1369 usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1370 return ret;
1371 }
1372
proc_bulk(struct usb_dev_state * ps,void __user * arg)1373 static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1374 {
1375 struct usbdevfs_bulktransfer bulk;
1376
1377 if (copy_from_user(&bulk, arg, sizeof(bulk)))
1378 return -EFAULT;
1379 return do_proc_bulk(ps, &bulk);
1380 }
1381
check_reset_of_active_ep(struct usb_device * udev,unsigned int epnum,char * ioctl_name)1382 static void check_reset_of_active_ep(struct usb_device *udev,
1383 unsigned int epnum, char *ioctl_name)
1384 {
1385 struct usb_host_endpoint **eps;
1386 struct usb_host_endpoint *ep;
1387
1388 eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1389 ep = eps[epnum & 0x0f];
1390 if (ep && !list_empty(&ep->urb_list))
1391 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1392 task_pid_nr(current), current->comm,
1393 ioctl_name, epnum);
1394 }
1395
proc_resetep(struct usb_dev_state * ps,void __user * arg)1396 static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1397 {
1398 unsigned int ep;
1399 int ret;
1400
1401 if (get_user(ep, (unsigned int __user *)arg))
1402 return -EFAULT;
1403 ret = findintfep(ps->dev, ep);
1404 if (ret < 0)
1405 return ret;
1406 ret = checkintf(ps, ret);
1407 if (ret)
1408 return ret;
1409 check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1410 usb_reset_endpoint(ps->dev, ep);
1411 return 0;
1412 }
1413
proc_clearhalt(struct usb_dev_state * ps,void __user * arg)1414 static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1415 {
1416 unsigned int ep;
1417 int pipe;
1418 int ret;
1419
1420 if (get_user(ep, (unsigned int __user *)arg))
1421 return -EFAULT;
1422 ret = findintfep(ps->dev, ep);
1423 if (ret < 0)
1424 return ret;
1425 ret = checkintf(ps, ret);
1426 if (ret)
1427 return ret;
1428 check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1429 if (ep & USB_DIR_IN)
1430 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1431 else
1432 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1433
1434 return usb_clear_halt(ps->dev, pipe);
1435 }
1436
proc_getdriver(struct usb_dev_state * ps,void __user * arg)1437 static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1438 {
1439 struct usbdevfs_getdriver gd;
1440 struct usb_interface *intf;
1441 int ret;
1442
1443 if (copy_from_user(&gd, arg, sizeof(gd)))
1444 return -EFAULT;
1445 intf = usb_ifnum_to_if(ps->dev, gd.interface);
1446 if (!intf || !intf->dev.driver)
1447 ret = -ENODATA;
1448 else {
1449 strscpy(gd.driver, intf->dev.driver->name,
1450 sizeof(gd.driver));
1451 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1452 }
1453 return ret;
1454 }
1455
proc_connectinfo(struct usb_dev_state * ps,void __user * arg)1456 static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1457 {
1458 struct usbdevfs_connectinfo ci;
1459
1460 memset(&ci, 0, sizeof(ci));
1461 ci.devnum = ps->dev->devnum;
1462 ci.slow = ps->dev->speed == USB_SPEED_LOW;
1463
1464 if (copy_to_user(arg, &ci, sizeof(ci)))
1465 return -EFAULT;
1466 return 0;
1467 }
1468
proc_conninfo_ex(struct usb_dev_state * ps,void __user * arg,size_t size)1469 static int proc_conninfo_ex(struct usb_dev_state *ps,
1470 void __user *arg, size_t size)
1471 {
1472 struct usbdevfs_conninfo_ex ci;
1473 struct usb_device *udev = ps->dev;
1474
1475 if (size < sizeof(ci.size))
1476 return -EINVAL;
1477
1478 memset(&ci, 0, sizeof(ci));
1479 ci.size = sizeof(ci);
1480 ci.busnum = udev->bus->busnum;
1481 ci.devnum = udev->devnum;
1482 ci.speed = udev->speed;
1483
1484 while (udev && udev->portnum != 0) {
1485 if (++ci.num_ports <= ARRAY_SIZE(ci.ports))
1486 ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports] =
1487 udev->portnum;
1488 udev = udev->parent;
1489 }
1490
1491 if (ci.num_ports < ARRAY_SIZE(ci.ports))
1492 memmove(&ci.ports[0],
1493 &ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports],
1494 ci.num_ports);
1495
1496 if (copy_to_user(arg, &ci, min(sizeof(ci), size)))
1497 return -EFAULT;
1498
1499 return 0;
1500 }
1501
proc_resetdevice(struct usb_dev_state * ps)1502 static int proc_resetdevice(struct usb_dev_state *ps)
1503 {
1504 struct usb_host_config *actconfig = ps->dev->actconfig;
1505 struct usb_interface *interface;
1506 int i, number;
1507
1508 /* Don't allow a device reset if the process has dropped the
1509 * privilege to do such things and any of the interfaces are
1510 * currently claimed.
1511 */
1512 if (ps->privileges_dropped && actconfig) {
1513 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1514 interface = actconfig->interface[i];
1515 number = interface->cur_altsetting->desc.bInterfaceNumber;
1516 if (usb_interface_claimed(interface) &&
1517 !test_bit(number, &ps->ifclaimed)) {
1518 dev_warn(&ps->dev->dev,
1519 "usbfs: interface %d claimed by %s while '%s' resets device\n",
1520 number, interface->dev.driver->name, current->comm);
1521 return -EACCES;
1522 }
1523 }
1524 }
1525
1526 return usb_reset_device(ps->dev);
1527 }
1528
proc_setintf(struct usb_dev_state * ps,void __user * arg)1529 static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1530 {
1531 struct usbdevfs_setinterface setintf;
1532 int ret;
1533
1534 if (copy_from_user(&setintf, arg, sizeof(setintf)))
1535 return -EFAULT;
1536 ret = checkintf(ps, setintf.interface);
1537 if (ret)
1538 return ret;
1539
1540 destroy_async_on_interface(ps, setintf.interface);
1541
1542 return usb_set_interface(ps->dev, setintf.interface,
1543 setintf.altsetting);
1544 }
1545
proc_setconfig(struct usb_dev_state * ps,void __user * arg)1546 static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1547 {
1548 int u;
1549 int status = 0;
1550 struct usb_host_config *actconfig;
1551
1552 if (get_user(u, (int __user *)arg))
1553 return -EFAULT;
1554
1555 actconfig = ps->dev->actconfig;
1556
1557 /* Don't touch the device if any interfaces are claimed.
1558 * It could interfere with other drivers' operations, and if
1559 * an interface is claimed by usbfs it could easily deadlock.
1560 */
1561 if (actconfig) {
1562 int i;
1563
1564 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1565 if (usb_interface_claimed(actconfig->interface[i])) {
1566 dev_warn(&ps->dev->dev,
1567 "usbfs: interface %d claimed by %s "
1568 "while '%s' sets config #%d\n",
1569 actconfig->interface[i]
1570 ->cur_altsetting
1571 ->desc.bInterfaceNumber,
1572 actconfig->interface[i]
1573 ->dev.driver->name,
1574 current->comm, u);
1575 status = -EBUSY;
1576 break;
1577 }
1578 }
1579 }
1580
1581 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1582 * so avoid usb_set_configuration()'s kick to sysfs
1583 */
1584 if (status == 0) {
1585 if (actconfig && actconfig->desc.bConfigurationValue == u)
1586 status = usb_reset_configuration(ps->dev);
1587 else
1588 status = usb_set_configuration(ps->dev, u);
1589 }
1590
1591 return status;
1592 }
1593
1594 static struct usb_memory *
find_memory_area(struct usb_dev_state * ps,const struct usbdevfs_urb * uurb)1595 find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
1596 {
1597 struct usb_memory *usbm = NULL, *iter;
1598 unsigned long flags;
1599 unsigned long uurb_start = (unsigned long)uurb->buffer;
1600
1601 spin_lock_irqsave(&ps->lock, flags);
1602 list_for_each_entry(iter, &ps->memory_list, memlist) {
1603 if (uurb_start >= iter->vm_start &&
1604 uurb_start < iter->vm_start + iter->size) {
1605 if (uurb->buffer_length > iter->vm_start + iter->size -
1606 uurb_start) {
1607 usbm = ERR_PTR(-EINVAL);
1608 } else {
1609 usbm = iter;
1610 usbm->urb_use_count++;
1611 }
1612 break;
1613 }
1614 }
1615 spin_unlock_irqrestore(&ps->lock, flags);
1616 return usbm;
1617 }
1618
proc_do_submiturb(struct usb_dev_state * ps,struct usbdevfs_urb * uurb,struct usbdevfs_iso_packet_desc __user * iso_frame_desc,void __user * arg,sigval_t userurb_sigval)1619 static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1620 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1621 void __user *arg, sigval_t userurb_sigval)
1622 {
1623 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1624 struct usb_host_endpoint *ep;
1625 struct async *as = NULL;
1626 struct usb_ctrlrequest *dr = NULL;
1627 unsigned int u, totlen, isofrmlen;
1628 int i, ret, num_sgs = 0, ifnum = -1;
1629 int number_of_packets = 0;
1630 unsigned int stream_id = 0;
1631 void *buf;
1632 bool is_in;
1633 bool allow_short = false;
1634 bool allow_zero = false;
1635 unsigned long mask = USBDEVFS_URB_SHORT_NOT_OK |
1636 USBDEVFS_URB_BULK_CONTINUATION |
1637 USBDEVFS_URB_NO_FSBR |
1638 USBDEVFS_URB_ZERO_PACKET |
1639 USBDEVFS_URB_NO_INTERRUPT;
1640 /* USBDEVFS_URB_ISO_ASAP is a special case */
1641 if (uurb->type == USBDEVFS_URB_TYPE_ISO)
1642 mask |= USBDEVFS_URB_ISO_ASAP;
1643
1644 if (uurb->flags & ~mask)
1645 return -EINVAL;
1646
1647 if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
1648 return -EINVAL;
1649 if (uurb->buffer_length > 0 && !uurb->buffer)
1650 return -EINVAL;
1651 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1652 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1653 ifnum = findintfep(ps->dev, uurb->endpoint);
1654 if (ifnum < 0)
1655 return ifnum;
1656 ret = checkintf(ps, ifnum);
1657 if (ret)
1658 return ret;
1659 }
1660 ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1661 if (!ep)
1662 return -ENOENT;
1663 is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1664
1665 u = 0;
1666 switch (uurb->type) {
1667 case USBDEVFS_URB_TYPE_CONTROL:
1668 if (!usb_endpoint_xfer_control(&ep->desc))
1669 return -EINVAL;
1670 /* min 8 byte setup packet */
1671 if (uurb->buffer_length < 8)
1672 return -EINVAL;
1673 dr = kmalloc_obj(struct usb_ctrlrequest);
1674 if (!dr)
1675 return -ENOMEM;
1676 if (copy_from_user(dr, uurb->buffer, 8)) {
1677 ret = -EFAULT;
1678 goto error;
1679 }
1680 if (uurb->buffer_length < (le16_to_cpu(dr->wLength) + 8)) {
1681 ret = -EINVAL;
1682 goto error;
1683 }
1684 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1685 le16_to_cpu(dr->wIndex));
1686 if (ret)
1687 goto error;
1688 uurb->buffer_length = le16_to_cpu(dr->wLength);
1689 uurb->buffer += 8;
1690 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1691 is_in = true;
1692 uurb->endpoint |= USB_DIR_IN;
1693 } else {
1694 is_in = false;
1695 uurb->endpoint &= ~USB_DIR_IN;
1696 }
1697 if (is_in)
1698 allow_short = true;
1699 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1700 "bRequest=%02x wValue=%04x "
1701 "wIndex=%04x wLength=%04x\n",
1702 dr->bRequestType, dr->bRequest,
1703 __le16_to_cpu(dr->wValue),
1704 __le16_to_cpu(dr->wIndex),
1705 __le16_to_cpu(dr->wLength));
1706 u = sizeof(struct usb_ctrlrequest);
1707 break;
1708
1709 case USBDEVFS_URB_TYPE_BULK:
1710 if (!is_in)
1711 allow_zero = true;
1712 else
1713 allow_short = true;
1714 switch (usb_endpoint_type(&ep->desc)) {
1715 case USB_ENDPOINT_XFER_CONTROL:
1716 case USB_ENDPOINT_XFER_ISOC:
1717 return -EINVAL;
1718 case USB_ENDPOINT_XFER_INT:
1719 /* allow single-shot interrupt transfers */
1720 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1721 goto interrupt_urb;
1722 }
1723 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1724 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1725 num_sgs = 0;
1726 if (ep->streams)
1727 stream_id = uurb->stream_id;
1728 break;
1729
1730 case USBDEVFS_URB_TYPE_INTERRUPT:
1731 if (!usb_endpoint_xfer_int(&ep->desc))
1732 return -EINVAL;
1733 interrupt_urb:
1734 if (!is_in)
1735 allow_zero = true;
1736 else
1737 allow_short = true;
1738 break;
1739
1740 case USBDEVFS_URB_TYPE_ISO:
1741 /* arbitrary limit */
1742 if (uurb->number_of_packets < 1 ||
1743 uurb->number_of_packets > 128)
1744 return -EINVAL;
1745 if (!usb_endpoint_xfer_isoc(&ep->desc))
1746 return -EINVAL;
1747 number_of_packets = uurb->number_of_packets;
1748 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1749 number_of_packets;
1750 isopkt = memdup_user(iso_frame_desc, isofrmlen);
1751 if (IS_ERR(isopkt)) {
1752 ret = PTR_ERR(isopkt);
1753 isopkt = NULL;
1754 goto error;
1755 }
1756 for (totlen = u = 0; u < number_of_packets; u++) {
1757 /*
1758 * arbitrary limit need for USB 3.1 Gen2
1759 * sizemax: 96 DPs at SSP, 96 * 1024 = 98304
1760 */
1761 if (isopkt[u].length > 98304) {
1762 ret = -EINVAL;
1763 goto error;
1764 }
1765 totlen += isopkt[u].length;
1766 }
1767 u *= sizeof(struct usb_iso_packet_descriptor);
1768 uurb->buffer_length = totlen;
1769 break;
1770
1771 default:
1772 return -EINVAL;
1773 }
1774
1775 if (uurb->buffer_length > 0 &&
1776 !access_ok(uurb->buffer, uurb->buffer_length)) {
1777 ret = -EFAULT;
1778 goto error;
1779 }
1780 as = alloc_async(number_of_packets);
1781 if (!as) {
1782 ret = -ENOMEM;
1783 goto error;
1784 }
1785
1786 as->usbm = find_memory_area(ps, uurb);
1787 if (IS_ERR(as->usbm)) {
1788 ret = PTR_ERR(as->usbm);
1789 as->usbm = NULL;
1790 goto error;
1791 }
1792
1793 /* do not use SG buffers when memory mapped segments
1794 * are in use
1795 */
1796 if (as->usbm)
1797 num_sgs = 0;
1798
1799 u += sizeof(struct async) + sizeof(struct urb) +
1800 (as->usbm ? 0 : uurb->buffer_length) +
1801 num_sgs * sizeof(struct scatterlist);
1802 ret = usbfs_increase_memory_usage(u);
1803 if (ret)
1804 goto error;
1805 as->mem_usage = u;
1806
1807 if (num_sgs) {
1808 as->urb->sg = kmalloc_objs(struct scatterlist, num_sgs,
1809 GFP_KERNEL | __GFP_NOWARN);
1810 if (!as->urb->sg) {
1811 ret = -ENOMEM;
1812 goto error;
1813 }
1814 as->urb->num_sgs = num_sgs;
1815 sg_init_table(as->urb->sg, as->urb->num_sgs);
1816
1817 totlen = uurb->buffer_length;
1818 for (i = 0; i < as->urb->num_sgs; i++) {
1819 u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1820 buf = kmalloc(u, GFP_KERNEL);
1821 if (!buf) {
1822 ret = -ENOMEM;
1823 goto error;
1824 }
1825 sg_set_buf(&as->urb->sg[i], buf, u);
1826
1827 if (!is_in) {
1828 if (copy_from_user(buf, uurb->buffer, u)) {
1829 ret = -EFAULT;
1830 goto error;
1831 }
1832 uurb->buffer += u;
1833 }
1834 totlen -= u;
1835 }
1836 } else if (uurb->buffer_length > 0) {
1837 if (as->usbm) {
1838 unsigned long uurb_start = (unsigned long)uurb->buffer;
1839
1840 as->urb->transfer_buffer = as->usbm->mem +
1841 (uurb_start - as->usbm->vm_start);
1842 } else {
1843 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1844 GFP_KERNEL | __GFP_NOWARN);
1845 if (!as->urb->transfer_buffer) {
1846 ret = -ENOMEM;
1847 goto error;
1848 }
1849 if (!is_in) {
1850 if (copy_from_user(as->urb->transfer_buffer,
1851 uurb->buffer,
1852 uurb->buffer_length)) {
1853 ret = -EFAULT;
1854 goto error;
1855 }
1856 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1857 /*
1858 * Isochronous input data may end up being
1859 * discontiguous if some of the packets are
1860 * short. Clear the buffer so that the gaps
1861 * don't leak kernel data to userspace.
1862 */
1863 memset(as->urb->transfer_buffer, 0,
1864 uurb->buffer_length);
1865 }
1866 }
1867 }
1868 as->urb->dev = ps->dev;
1869 as->urb->pipe = (uurb->type << 30) |
1870 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1871 (uurb->endpoint & USB_DIR_IN);
1872
1873 /* This tedious sequence is necessary because the URB_* flags
1874 * are internal to the kernel and subject to change, whereas
1875 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1876 */
1877 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1878 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1879 u |= URB_ISO_ASAP;
1880 if (allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1881 u |= URB_SHORT_NOT_OK;
1882 if (allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1883 u |= URB_ZERO_PACKET;
1884 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1885 u |= URB_NO_INTERRUPT;
1886 as->urb->transfer_flags = u;
1887
1888 if (!allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1889 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_SHORT_NOT_OK.\n");
1890 if (!allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1891 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_ZERO_PACKET.\n");
1892
1893 as->urb->transfer_buffer_length = uurb->buffer_length;
1894 as->urb->setup_packet = (unsigned char *)dr;
1895 dr = NULL;
1896 as->urb->start_frame = uurb->start_frame;
1897 as->urb->number_of_packets = number_of_packets;
1898 as->urb->stream_id = stream_id;
1899
1900 if (ep->desc.bInterval) {
1901 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1902 ps->dev->speed == USB_SPEED_HIGH ||
1903 ps->dev->speed >= USB_SPEED_SUPER)
1904 as->urb->interval = 1 <<
1905 min(15, ep->desc.bInterval - 1);
1906 else
1907 as->urb->interval = ep->desc.bInterval;
1908 }
1909
1910 as->urb->context = as;
1911 as->urb->complete = async_completed;
1912 for (totlen = u = 0; u < number_of_packets; u++) {
1913 as->urb->iso_frame_desc[u].offset = totlen;
1914 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1915 totlen += isopkt[u].length;
1916 }
1917 kfree(isopkt);
1918 isopkt = NULL;
1919 as->ps = ps;
1920 as->userurb = arg;
1921 as->userurb_sigval = userurb_sigval;
1922 if (as->usbm) {
1923 unsigned long uurb_start = (unsigned long)uurb->buffer;
1924
1925 as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1926 as->urb->transfer_dma = as->usbm->dma_handle +
1927 (uurb_start - as->usbm->vm_start);
1928 } else if (is_in && uurb->buffer_length > 0)
1929 as->userbuffer = uurb->buffer;
1930 as->signr = uurb->signr;
1931 as->ifnum = ifnum;
1932 as->pid = get_pid(task_pid(current));
1933 as->cred = get_current_cred();
1934 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1935 as->urb->transfer_buffer_length, 0, SUBMIT,
1936 NULL, 0);
1937 if (!is_in)
1938 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1939
1940 async_newpending(as);
1941
1942 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1943 spin_lock_irq(&ps->lock);
1944
1945 /* Not exactly the endpoint address; the direction bit is
1946 * shifted to the 0x10 position so that the value will be
1947 * between 0 and 31.
1948 */
1949 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1950 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1951 >> 3);
1952
1953 /* If this bulk URB is the start of a new transfer, re-enable
1954 * the endpoint. Otherwise mark it as a continuation URB.
1955 */
1956 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1957 as->bulk_status = AS_CONTINUATION;
1958 else
1959 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1960
1961 /* Don't accept continuation URBs if the endpoint is
1962 * disabled because of an earlier error.
1963 */
1964 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1965 ret = -EREMOTEIO;
1966 else
1967 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1968 spin_unlock_irq(&ps->lock);
1969 } else {
1970 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1971 }
1972
1973 if (ret) {
1974 dev_printk(KERN_DEBUG, &ps->dev->dev,
1975 "usbfs: usb_submit_urb returned %d\n", ret);
1976 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1977 0, ret, COMPLETE, NULL, 0);
1978 async_removepending(as);
1979 goto error;
1980 }
1981 return 0;
1982
1983 error:
1984 kfree(isopkt);
1985 kfree(dr);
1986 if (as)
1987 free_async(as);
1988 return ret;
1989 }
1990
proc_submiturb(struct usb_dev_state * ps,void __user * arg)1991 static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1992 {
1993 struct usbdevfs_urb uurb;
1994 sigval_t userurb_sigval;
1995
1996 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1997 return -EFAULT;
1998
1999 memset(&userurb_sigval, 0, sizeof(userurb_sigval));
2000 userurb_sigval.sival_ptr = arg;
2001
2002 return proc_do_submiturb(ps, &uurb,
2003 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
2004 arg, userurb_sigval);
2005 }
2006
proc_unlinkurb(struct usb_dev_state * ps,void __user * arg)2007 static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
2008 {
2009 struct urb *urb;
2010 struct async *as;
2011 unsigned long flags;
2012
2013 spin_lock_irqsave(&ps->lock, flags);
2014 as = async_getpending(ps, arg);
2015 if (!as) {
2016 spin_unlock_irqrestore(&ps->lock, flags);
2017 return -EINVAL;
2018 }
2019
2020 urb = as->urb;
2021 usb_get_urb(urb);
2022 spin_unlock_irqrestore(&ps->lock, flags);
2023
2024 usb_kill_urb(urb);
2025 usb_put_urb(urb);
2026
2027 return 0;
2028 }
2029
compute_isochronous_actual_length(struct urb * urb)2030 static void compute_isochronous_actual_length(struct urb *urb)
2031 {
2032 unsigned int i;
2033
2034 if (urb->number_of_packets > 0) {
2035 urb->actual_length = 0;
2036 for (i = 0; i < urb->number_of_packets; i++)
2037 urb->actual_length +=
2038 urb->iso_frame_desc[i].actual_length;
2039 }
2040 }
2041
processcompl(struct async * as,void __user * __user * arg)2042 static int processcompl(struct async *as, void __user * __user *arg)
2043 {
2044 struct urb *urb = as->urb;
2045 struct usbdevfs_urb __user *userurb = as->userurb;
2046 void __user *addr = as->userurb;
2047 unsigned int i;
2048
2049 compute_isochronous_actual_length(urb);
2050 if (as->userbuffer && urb->actual_length) {
2051 if (copy_urb_data_to_user(as->userbuffer, urb))
2052 goto err_out;
2053 }
2054 if (put_user(as->status, &userurb->status))
2055 goto err_out;
2056 if (put_user(urb->actual_length, &userurb->actual_length))
2057 goto err_out;
2058 if (put_user(urb->error_count, &userurb->error_count))
2059 goto err_out;
2060
2061 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2062 for (i = 0; i < urb->number_of_packets; i++) {
2063 if (put_user(urb->iso_frame_desc[i].actual_length,
2064 &userurb->iso_frame_desc[i].actual_length))
2065 goto err_out;
2066 if (put_user(urb->iso_frame_desc[i].status,
2067 &userurb->iso_frame_desc[i].status))
2068 goto err_out;
2069 }
2070 }
2071
2072 if (put_user(addr, (void __user * __user *)arg))
2073 return -EFAULT;
2074 return 0;
2075
2076 err_out:
2077 return -EFAULT;
2078 }
2079
reap_as(struct usb_dev_state * ps)2080 static struct async *reap_as(struct usb_dev_state *ps)
2081 {
2082 DECLARE_WAITQUEUE(wait, current);
2083 struct async *as = NULL;
2084 struct usb_device *dev = ps->dev;
2085
2086 add_wait_queue(&ps->wait, &wait);
2087 for (;;) {
2088 __set_current_state(TASK_INTERRUPTIBLE);
2089 as = async_getcompleted(ps);
2090 if (as || !connected(ps))
2091 break;
2092 if (signal_pending(current))
2093 break;
2094 usb_unlock_device(dev);
2095 schedule();
2096 usb_lock_device(dev);
2097 }
2098 remove_wait_queue(&ps->wait, &wait);
2099 set_current_state(TASK_RUNNING);
2100 return as;
2101 }
2102
proc_reapurb(struct usb_dev_state * ps,void __user * arg)2103 static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
2104 {
2105 struct async *as = reap_as(ps);
2106
2107 if (as) {
2108 int retval;
2109
2110 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2111 retval = processcompl(as, (void __user * __user *)arg);
2112 free_async(as);
2113 return retval;
2114 }
2115 if (signal_pending(current))
2116 return -EINTR;
2117 return -ENODEV;
2118 }
2119
proc_reapurbnonblock(struct usb_dev_state * ps,void __user * arg)2120 static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
2121 {
2122 int retval;
2123 struct async *as;
2124
2125 as = async_getcompleted(ps);
2126 if (as) {
2127 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2128 retval = processcompl(as, (void __user * __user *)arg);
2129 free_async(as);
2130 } else {
2131 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2132 }
2133 return retval;
2134 }
2135
2136 #ifdef CONFIG_COMPAT
proc_control_compat(struct usb_dev_state * ps,struct usbdevfs_ctrltransfer32 __user * p32)2137 static int proc_control_compat(struct usb_dev_state *ps,
2138 struct usbdevfs_ctrltransfer32 __user *p32)
2139 {
2140 struct usbdevfs_ctrltransfer ctrl;
2141 u32 udata;
2142
2143 if (copy_from_user(&ctrl, p32, sizeof(*p32) - sizeof(compat_caddr_t)) ||
2144 get_user(udata, &p32->data))
2145 return -EFAULT;
2146 ctrl.data = compat_ptr(udata);
2147 return do_proc_control(ps, &ctrl);
2148 }
2149
proc_bulk_compat(struct usb_dev_state * ps,struct usbdevfs_bulktransfer32 __user * p32)2150 static int proc_bulk_compat(struct usb_dev_state *ps,
2151 struct usbdevfs_bulktransfer32 __user *p32)
2152 {
2153 struct usbdevfs_bulktransfer bulk;
2154 compat_caddr_t addr;
2155
2156 if (get_user(bulk.ep, &p32->ep) ||
2157 get_user(bulk.len, &p32->len) ||
2158 get_user(bulk.timeout, &p32->timeout) ||
2159 get_user(addr, &p32->data))
2160 return -EFAULT;
2161 bulk.data = compat_ptr(addr);
2162 return do_proc_bulk(ps, &bulk);
2163 }
2164
proc_disconnectsignal_compat(struct usb_dev_state * ps,void __user * arg)2165 static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
2166 {
2167 struct usbdevfs_disconnectsignal32 ds;
2168
2169 if (copy_from_user(&ds, arg, sizeof(ds)))
2170 return -EFAULT;
2171 ps->discsignr = ds.signr;
2172 ps->disccontext.sival_int = ds.context;
2173 return 0;
2174 }
2175
get_urb32(struct usbdevfs_urb * kurb,struct usbdevfs_urb32 __user * uurb)2176 static int get_urb32(struct usbdevfs_urb *kurb,
2177 struct usbdevfs_urb32 __user *uurb)
2178 {
2179 struct usbdevfs_urb32 urb32;
2180 if (copy_from_user(&urb32, uurb, sizeof(*uurb)))
2181 return -EFAULT;
2182 kurb->type = urb32.type;
2183 kurb->endpoint = urb32.endpoint;
2184 kurb->status = urb32.status;
2185 kurb->flags = urb32.flags;
2186 kurb->buffer = compat_ptr(urb32.buffer);
2187 kurb->buffer_length = urb32.buffer_length;
2188 kurb->actual_length = urb32.actual_length;
2189 kurb->start_frame = urb32.start_frame;
2190 kurb->number_of_packets = urb32.number_of_packets;
2191 kurb->error_count = urb32.error_count;
2192 kurb->signr = urb32.signr;
2193 kurb->usercontext = compat_ptr(urb32.usercontext);
2194 return 0;
2195 }
2196
proc_submiturb_compat(struct usb_dev_state * ps,void __user * arg)2197 static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
2198 {
2199 struct usbdevfs_urb uurb;
2200 sigval_t userurb_sigval;
2201
2202 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
2203 return -EFAULT;
2204
2205 memset(&userurb_sigval, 0, sizeof(userurb_sigval));
2206 userurb_sigval.sival_int = ptr_to_compat(arg);
2207
2208 return proc_do_submiturb(ps, &uurb,
2209 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
2210 arg, userurb_sigval);
2211 }
2212
processcompl_compat(struct async * as,void __user * __user * arg)2213 static int processcompl_compat(struct async *as, void __user * __user *arg)
2214 {
2215 struct urb *urb = as->urb;
2216 struct usbdevfs_urb32 __user *userurb = as->userurb;
2217 void __user *addr = as->userurb;
2218 unsigned int i;
2219
2220 compute_isochronous_actual_length(urb);
2221 if (as->userbuffer && urb->actual_length) {
2222 if (copy_urb_data_to_user(as->userbuffer, urb))
2223 return -EFAULT;
2224 }
2225 if (put_user(as->status, &userurb->status))
2226 return -EFAULT;
2227 if (put_user(urb->actual_length, &userurb->actual_length))
2228 return -EFAULT;
2229 if (put_user(urb->error_count, &userurb->error_count))
2230 return -EFAULT;
2231
2232 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2233 for (i = 0; i < urb->number_of_packets; i++) {
2234 if (put_user(urb->iso_frame_desc[i].actual_length,
2235 &userurb->iso_frame_desc[i].actual_length))
2236 return -EFAULT;
2237 if (put_user(urb->iso_frame_desc[i].status,
2238 &userurb->iso_frame_desc[i].status))
2239 return -EFAULT;
2240 }
2241 }
2242
2243 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2244 return -EFAULT;
2245 return 0;
2246 }
2247
proc_reapurb_compat(struct usb_dev_state * ps,void __user * arg)2248 static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
2249 {
2250 struct async *as = reap_as(ps);
2251
2252 if (as) {
2253 int retval;
2254
2255 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2256 retval = processcompl_compat(as, (void __user * __user *)arg);
2257 free_async(as);
2258 return retval;
2259 }
2260 if (signal_pending(current))
2261 return -EINTR;
2262 return -ENODEV;
2263 }
2264
proc_reapurbnonblock_compat(struct usb_dev_state * ps,void __user * arg)2265 static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
2266 {
2267 int retval;
2268 struct async *as;
2269
2270 as = async_getcompleted(ps);
2271 if (as) {
2272 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2273 retval = processcompl_compat(as, (void __user * __user *)arg);
2274 free_async(as);
2275 } else {
2276 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2277 }
2278 return retval;
2279 }
2280
2281
2282 #endif
2283
proc_disconnectsignal(struct usb_dev_state * ps,void __user * arg)2284 static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
2285 {
2286 struct usbdevfs_disconnectsignal ds;
2287
2288 if (copy_from_user(&ds, arg, sizeof(ds)))
2289 return -EFAULT;
2290 ps->discsignr = ds.signr;
2291 ps->disccontext.sival_ptr = ds.context;
2292 return 0;
2293 }
2294
proc_claiminterface(struct usb_dev_state * ps,void __user * arg)2295 static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
2296 {
2297 unsigned int ifnum;
2298
2299 if (get_user(ifnum, (unsigned int __user *)arg))
2300 return -EFAULT;
2301 return claimintf(ps, ifnum);
2302 }
2303
proc_releaseinterface(struct usb_dev_state * ps,void __user * arg)2304 static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
2305 {
2306 unsigned int ifnum;
2307 int ret;
2308
2309 if (get_user(ifnum, (unsigned int __user *)arg))
2310 return -EFAULT;
2311 ret = releaseintf(ps, ifnum);
2312 if (ret < 0)
2313 return ret;
2314 destroy_async_on_interface(ps, ifnum);
2315 return 0;
2316 }
2317
proc_ioctl(struct usb_dev_state * ps,struct usbdevfs_ioctl * ctl)2318 static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
2319 {
2320 int size;
2321 void *buf = NULL;
2322 int retval = 0;
2323 struct usb_interface *intf = NULL;
2324 struct usb_driver *driver = NULL;
2325
2326 if (ps->privileges_dropped)
2327 return -EACCES;
2328
2329 if (!connected(ps))
2330 return -ENODEV;
2331
2332 /* alloc buffer */
2333 size = _IOC_SIZE(ctl->ioctl_code);
2334 if (size > 0) {
2335 buf = kmalloc(size, GFP_KERNEL);
2336 if (buf == NULL)
2337 return -ENOMEM;
2338 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2339 if (copy_from_user(buf, ctl->data, size)) {
2340 kfree(buf);
2341 return -EFAULT;
2342 }
2343 } else {
2344 memset(buf, 0, size);
2345 }
2346 }
2347
2348 if (ps->dev->state != USB_STATE_CONFIGURED)
2349 retval = -EHOSTUNREACH;
2350 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
2351 retval = -EINVAL;
2352 else switch (ctl->ioctl_code) {
2353
2354 /* disconnect kernel driver from interface */
2355 case USBDEVFS_DISCONNECT:
2356 if (intf->dev.driver) {
2357 driver = to_usb_driver(intf->dev.driver);
2358 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2359 usb_driver_release_interface(driver, intf);
2360 } else
2361 retval = -ENODATA;
2362 break;
2363
2364 /* let kernel drivers try to (re)bind to the interface */
2365 case USBDEVFS_CONNECT:
2366 if (!intf->dev.driver)
2367 retval = device_attach(&intf->dev);
2368 else
2369 retval = -EBUSY;
2370 break;
2371
2372 /* talk directly to the interface's driver */
2373 default:
2374 if (intf->dev.driver)
2375 driver = to_usb_driver(intf->dev.driver);
2376 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2377 retval = -ENOTTY;
2378 } else {
2379 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2380 if (retval == -ENOIOCTLCMD)
2381 retval = -ENOTTY;
2382 }
2383 }
2384
2385 /* cleanup and return */
2386 if (retval >= 0
2387 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2388 && size > 0
2389 && copy_to_user(ctl->data, buf, size) != 0)
2390 retval = -EFAULT;
2391
2392 kfree(buf);
2393 return retval;
2394 }
2395
proc_ioctl_default(struct usb_dev_state * ps,void __user * arg)2396 static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2397 {
2398 struct usbdevfs_ioctl ctrl;
2399
2400 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2401 return -EFAULT;
2402 return proc_ioctl(ps, &ctrl);
2403 }
2404
2405 #ifdef CONFIG_COMPAT
proc_ioctl_compat(struct usb_dev_state * ps,compat_uptr_t arg)2406 static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2407 {
2408 struct usbdevfs_ioctl32 ioc32;
2409 struct usbdevfs_ioctl ctrl;
2410
2411 if (copy_from_user(&ioc32, compat_ptr(arg), sizeof(ioc32)))
2412 return -EFAULT;
2413 ctrl.ifno = ioc32.ifno;
2414 ctrl.ioctl_code = ioc32.ioctl_code;
2415 ctrl.data = compat_ptr(ioc32.data);
2416 return proc_ioctl(ps, &ctrl);
2417 }
2418 #endif
2419
proc_claim_port(struct usb_dev_state * ps,void __user * arg)2420 static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2421 {
2422 unsigned portnum;
2423 int rc;
2424
2425 if (get_user(portnum, (unsigned __user *) arg))
2426 return -EFAULT;
2427 rc = usb_hub_claim_port(ps->dev, portnum, ps);
2428 if (rc == 0)
2429 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2430 portnum, task_pid_nr(current), current->comm);
2431 return rc;
2432 }
2433
proc_release_port(struct usb_dev_state * ps,void __user * arg)2434 static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2435 {
2436 unsigned portnum;
2437
2438 if (get_user(portnum, (unsigned __user *) arg))
2439 return -EFAULT;
2440 return usb_hub_release_port(ps->dev, portnum, ps);
2441 }
2442
proc_get_capabilities(struct usb_dev_state * ps,void __user * arg)2443 static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2444 {
2445 __u32 caps;
2446
2447 caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2448 USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
2449 USBDEVFS_CAP_DROP_PRIVILEGES |
2450 USBDEVFS_CAP_CONNINFO_EX | MAYBE_CAP_SUSPEND;
2451 if (!ps->dev->bus->no_stop_on_short)
2452 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2453 if (ps->dev->bus->sg_tablesize)
2454 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2455
2456 if (put_user(caps, (__u32 __user *)arg))
2457 return -EFAULT;
2458
2459 return 0;
2460 }
2461
proc_disconnect_claim(struct usb_dev_state * ps,void __user * arg)2462 static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2463 {
2464 struct usbdevfs_disconnect_claim dc;
2465 struct usb_interface *intf;
2466
2467 if (copy_from_user(&dc, arg, sizeof(dc)))
2468 return -EFAULT;
2469
2470 intf = usb_ifnum_to_if(ps->dev, dc.interface);
2471 if (!intf)
2472 return -EINVAL;
2473
2474 if (intf->dev.driver) {
2475 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2476
2477 if (ps->privileges_dropped)
2478 return -EACCES;
2479
2480 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2481 strncmp(dc.driver, intf->dev.driver->name,
2482 sizeof(dc.driver)) != 0)
2483 return -EBUSY;
2484
2485 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2486 strncmp(dc.driver, intf->dev.driver->name,
2487 sizeof(dc.driver)) == 0)
2488 return -EBUSY;
2489
2490 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2491 usb_driver_release_interface(driver, intf);
2492 }
2493
2494 return claimintf(ps, dc.interface);
2495 }
2496
proc_alloc_streams(struct usb_dev_state * ps,void __user * arg)2497 static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2498 {
2499 unsigned num_streams, num_eps;
2500 struct usb_host_endpoint **eps;
2501 struct usb_interface *intf;
2502 int r;
2503
2504 r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2505 &eps, &intf);
2506 if (r)
2507 return r;
2508
2509 destroy_async_on_interface(ps,
2510 intf->altsetting[0].desc.bInterfaceNumber);
2511
2512 r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2513 kfree(eps);
2514 return r;
2515 }
2516
proc_free_streams(struct usb_dev_state * ps,void __user * arg)2517 static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2518 {
2519 unsigned num_eps;
2520 struct usb_host_endpoint **eps;
2521 struct usb_interface *intf;
2522 int r;
2523
2524 r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2525 if (r)
2526 return r;
2527
2528 destroy_async_on_interface(ps,
2529 intf->altsetting[0].desc.bInterfaceNumber);
2530
2531 r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2532 kfree(eps);
2533 return r;
2534 }
2535
proc_drop_privileges(struct usb_dev_state * ps,void __user * arg)2536 static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
2537 {
2538 u32 data;
2539
2540 if (copy_from_user(&data, arg, sizeof(data)))
2541 return -EFAULT;
2542
2543 /* This is a one way operation. Once privileges are
2544 * dropped, you cannot regain them. You may however reissue
2545 * this ioctl to shrink the allowed interfaces mask.
2546 */
2547 ps->interface_allowed_mask &= data;
2548 ps->privileges_dropped = true;
2549
2550 return 0;
2551 }
2552
proc_forbid_suspend(struct usb_dev_state * ps)2553 static int proc_forbid_suspend(struct usb_dev_state *ps)
2554 {
2555 int ret = 0;
2556
2557 if (ps->suspend_allowed) {
2558 ret = usb_autoresume_device(ps->dev);
2559 if (ret == 0)
2560 ps->suspend_allowed = false;
2561 else if (ret != -ENODEV)
2562 ret = -EIO;
2563 }
2564 return ret;
2565 }
2566
proc_allow_suspend(struct usb_dev_state * ps)2567 static int proc_allow_suspend(struct usb_dev_state *ps)
2568 {
2569 if (!connected(ps))
2570 return -ENODEV;
2571
2572 WRITE_ONCE(ps->not_yet_resumed, 1);
2573 if (!ps->suspend_allowed) {
2574 usb_autosuspend_device(ps->dev);
2575 ps->suspend_allowed = true;
2576 }
2577 return 0;
2578 }
2579
proc_wait_for_resume(struct usb_dev_state * ps)2580 static int proc_wait_for_resume(struct usb_dev_state *ps)
2581 {
2582 int ret;
2583
2584 usb_unlock_device(ps->dev);
2585 ret = wait_event_interruptible(ps->wait_for_resume,
2586 READ_ONCE(ps->not_yet_resumed) == 0);
2587 usb_lock_device(ps->dev);
2588
2589 if (ret != 0)
2590 return -EINTR;
2591 return proc_forbid_suspend(ps);
2592 }
2593
2594 /*
2595 * NOTE: All requests here that have interface numbers as parameters
2596 * are assuming that somehow the configuration has been prevented from
2597 * changing. But there's no mechanism to ensure that...
2598 */
usbdev_do_ioctl(struct file * file,unsigned int cmd,void __user * p)2599 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2600 void __user *p)
2601 {
2602 struct usb_dev_state *ps = file->private_data;
2603 struct inode *inode = file_inode(file);
2604 struct usb_device *dev = ps->dev;
2605 int ret = -ENOTTY;
2606
2607 if (!(file->f_mode & FMODE_WRITE))
2608 return -EPERM;
2609
2610 usb_lock_device(dev);
2611
2612 /* Reap operations are allowed even after disconnection */
2613 switch (cmd) {
2614 case USBDEVFS_REAPURB:
2615 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2616 ret = proc_reapurb(ps, p);
2617 goto done;
2618
2619 case USBDEVFS_REAPURBNDELAY:
2620 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2621 ret = proc_reapurbnonblock(ps, p);
2622 goto done;
2623
2624 #ifdef CONFIG_COMPAT
2625 case USBDEVFS_REAPURB32:
2626 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2627 ret = proc_reapurb_compat(ps, p);
2628 goto done;
2629
2630 case USBDEVFS_REAPURBNDELAY32:
2631 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2632 ret = proc_reapurbnonblock_compat(ps, p);
2633 goto done;
2634 #endif
2635 }
2636
2637 if (!connected(ps)) {
2638 usb_unlock_device(dev);
2639 return -ENODEV;
2640 }
2641
2642 switch (cmd) {
2643 case USBDEVFS_CONTROL:
2644 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2645 ret = proc_control(ps, p);
2646 if (ret >= 0)
2647 inode_set_mtime_to_ts(inode,
2648 inode_set_ctime_current(inode));
2649 break;
2650
2651 case USBDEVFS_BULK:
2652 snoop(&dev->dev, "%s: BULK\n", __func__);
2653 ret = proc_bulk(ps, p);
2654 if (ret >= 0)
2655 inode_set_mtime_to_ts(inode,
2656 inode_set_ctime_current(inode));
2657 break;
2658
2659 case USBDEVFS_RESETEP:
2660 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2661 ret = proc_resetep(ps, p);
2662 if (ret >= 0)
2663 inode_set_mtime_to_ts(inode,
2664 inode_set_ctime_current(inode));
2665 break;
2666
2667 case USBDEVFS_RESET:
2668 snoop(&dev->dev, "%s: RESET\n", __func__);
2669 ret = proc_resetdevice(ps);
2670 break;
2671
2672 case USBDEVFS_CLEAR_HALT:
2673 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2674 ret = proc_clearhalt(ps, p);
2675 if (ret >= 0)
2676 inode_set_mtime_to_ts(inode,
2677 inode_set_ctime_current(inode));
2678 break;
2679
2680 case USBDEVFS_GETDRIVER:
2681 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2682 ret = proc_getdriver(ps, p);
2683 break;
2684
2685 case USBDEVFS_CONNECTINFO:
2686 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2687 ret = proc_connectinfo(ps, p);
2688 break;
2689
2690 case USBDEVFS_SETINTERFACE:
2691 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2692 ret = proc_setintf(ps, p);
2693 break;
2694
2695 case USBDEVFS_SETCONFIGURATION:
2696 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2697 ret = proc_setconfig(ps, p);
2698 break;
2699
2700 case USBDEVFS_SUBMITURB:
2701 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2702 ret = proc_submiturb(ps, p);
2703 if (ret >= 0)
2704 inode_set_mtime_to_ts(inode,
2705 inode_set_ctime_current(inode));
2706 break;
2707
2708 #ifdef CONFIG_COMPAT
2709 case USBDEVFS_CONTROL32:
2710 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2711 ret = proc_control_compat(ps, p);
2712 if (ret >= 0)
2713 inode_set_mtime_to_ts(inode,
2714 inode_set_ctime_current(inode));
2715 break;
2716
2717 case USBDEVFS_BULK32:
2718 snoop(&dev->dev, "%s: BULK32\n", __func__);
2719 ret = proc_bulk_compat(ps, p);
2720 if (ret >= 0)
2721 inode_set_mtime_to_ts(inode,
2722 inode_set_ctime_current(inode));
2723 break;
2724
2725 case USBDEVFS_DISCSIGNAL32:
2726 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2727 ret = proc_disconnectsignal_compat(ps, p);
2728 break;
2729
2730 case USBDEVFS_SUBMITURB32:
2731 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2732 ret = proc_submiturb_compat(ps, p);
2733 if (ret >= 0)
2734 inode_set_mtime_to_ts(inode,
2735 inode_set_ctime_current(inode));
2736 break;
2737
2738 case USBDEVFS_IOCTL32:
2739 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2740 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2741 break;
2742 #endif
2743
2744 case USBDEVFS_DISCARDURB:
2745 snoop(&dev->dev, "%s: DISCARDURB %px\n", __func__, p);
2746 ret = proc_unlinkurb(ps, p);
2747 break;
2748
2749 case USBDEVFS_DISCSIGNAL:
2750 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2751 ret = proc_disconnectsignal(ps, p);
2752 break;
2753
2754 case USBDEVFS_CLAIMINTERFACE:
2755 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2756 ret = proc_claiminterface(ps, p);
2757 break;
2758
2759 case USBDEVFS_RELEASEINTERFACE:
2760 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2761 ret = proc_releaseinterface(ps, p);
2762 break;
2763
2764 case USBDEVFS_IOCTL:
2765 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2766 ret = proc_ioctl_default(ps, p);
2767 break;
2768
2769 case USBDEVFS_CLAIM_PORT:
2770 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2771 ret = proc_claim_port(ps, p);
2772 break;
2773
2774 case USBDEVFS_RELEASE_PORT:
2775 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2776 ret = proc_release_port(ps, p);
2777 break;
2778 case USBDEVFS_GET_CAPABILITIES:
2779 ret = proc_get_capabilities(ps, p);
2780 break;
2781 case USBDEVFS_DISCONNECT_CLAIM:
2782 ret = proc_disconnect_claim(ps, p);
2783 break;
2784 case USBDEVFS_ALLOC_STREAMS:
2785 ret = proc_alloc_streams(ps, p);
2786 break;
2787 case USBDEVFS_FREE_STREAMS:
2788 ret = proc_free_streams(ps, p);
2789 break;
2790 case USBDEVFS_DROP_PRIVILEGES:
2791 ret = proc_drop_privileges(ps, p);
2792 break;
2793 case USBDEVFS_GET_SPEED:
2794 ret = ps->dev->speed;
2795 break;
2796 case USBDEVFS_FORBID_SUSPEND:
2797 ret = proc_forbid_suspend(ps);
2798 break;
2799 case USBDEVFS_ALLOW_SUSPEND:
2800 ret = proc_allow_suspend(ps);
2801 break;
2802 case USBDEVFS_WAIT_FOR_RESUME:
2803 ret = proc_wait_for_resume(ps);
2804 break;
2805 }
2806
2807 /* Handle variable-length commands */
2808 switch (cmd & ~IOCSIZE_MASK) {
2809 case USBDEVFS_CONNINFO_EX(0):
2810 ret = proc_conninfo_ex(ps, p, _IOC_SIZE(cmd));
2811 break;
2812 }
2813
2814 done:
2815 usb_unlock_device(dev);
2816 if (ret >= 0)
2817 inode_set_atime_to_ts(inode, current_time(inode));
2818 return ret;
2819 }
2820
usbdev_ioctl(struct file * file,unsigned int cmd,unsigned long arg)2821 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2822 unsigned long arg)
2823 {
2824 int ret;
2825
2826 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2827
2828 return ret;
2829 }
2830
2831 /* No kernel lock - fine */
usbdev_poll(struct file * file,struct poll_table_struct * wait)2832 static __poll_t usbdev_poll(struct file *file,
2833 struct poll_table_struct *wait)
2834 {
2835 struct usb_dev_state *ps = file->private_data;
2836 __poll_t mask = 0;
2837
2838 poll_wait(file, &ps->wait, wait);
2839 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2840 mask |= EPOLLOUT | EPOLLWRNORM;
2841 if (!connected(ps))
2842 mask |= EPOLLHUP;
2843 if (list_empty(&ps->list))
2844 mask |= EPOLLERR;
2845 return mask;
2846 }
2847
2848 const struct file_operations usbdev_file_operations = {
2849 .owner = THIS_MODULE,
2850 .llseek = no_seek_end_llseek,
2851 .read = usbdev_read,
2852 .poll = usbdev_poll,
2853 .unlocked_ioctl = usbdev_ioctl,
2854 .compat_ioctl = compat_ptr_ioctl,
2855 .mmap = usbdev_mmap,
2856 .open = usbdev_open,
2857 .release = usbdev_release,
2858 };
2859
usbdev_remove(struct usb_device * udev)2860 static void usbdev_remove(struct usb_device *udev)
2861 {
2862 struct usb_dev_state *ps;
2863
2864 /* Protect against simultaneous resume */
2865 mutex_lock(&usbfs_mutex);
2866 while (!list_empty(&udev->filelist)) {
2867 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2868 destroy_all_async(ps);
2869 wake_up_all(&ps->wait);
2870 WRITE_ONCE(ps->not_yet_resumed, 0);
2871 wake_up_all(&ps->wait_for_resume);
2872 list_del_init(&ps->list);
2873 if (ps->discsignr)
2874 kill_pid_usb_asyncio(ps->discsignr, EPIPE, ps->disccontext,
2875 ps->disc_pid, ps->cred);
2876 }
2877 mutex_unlock(&usbfs_mutex);
2878 }
2879
usbdev_notify(struct notifier_block * self,unsigned long action,void * dev)2880 static int usbdev_notify(struct notifier_block *self,
2881 unsigned long action, void *dev)
2882 {
2883 switch (action) {
2884 case USB_DEVICE_ADD:
2885 break;
2886 case USB_DEVICE_REMOVE:
2887 usbdev_remove(dev);
2888 break;
2889 }
2890 return NOTIFY_OK;
2891 }
2892
2893 static struct notifier_block usbdev_nb = {
2894 .notifier_call = usbdev_notify,
2895 };
2896
2897 static struct cdev usb_device_cdev;
2898
usb_devio_init(void)2899 int __init usb_devio_init(void)
2900 {
2901 int retval;
2902
2903 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2904 "usb_device");
2905 if (retval) {
2906 printk(KERN_ERR "Unable to register minors for usb_device\n");
2907 goto out;
2908 }
2909 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2910 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2911 if (retval) {
2912 printk(KERN_ERR "Unable to get usb_device major %d\n",
2913 USB_DEVICE_MAJOR);
2914 goto error_cdev;
2915 }
2916 usb_register_notify(&usbdev_nb);
2917 out:
2918 return retval;
2919
2920 error_cdev:
2921 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2922 goto out;
2923 }
2924
usb_devio_cleanup(void)2925 void usb_devio_cleanup(void)
2926 {
2927 usb_unregister_notify(&usbdev_nb);
2928 cdev_del(&usb_device_cdev);
2929 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2930 }
2931