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1 /*****************************************************************************/
2 
3 /*
4  *      devio.c  --  User space communication with USB devices.
5  *
6  *      Copyright (C) 1999-2000  Thomas Sailer (sailer@ife.ee.ethz.ch)
7  *
8  *      This program is free software; you can redistribute it and/or modify
9  *      it under the terms of the GNU General Public License as published by
10  *      the Free Software Foundation; either version 2 of the License, or
11  *      (at your option) any later version.
12  *
13  *      This program is distributed in the hope that it will be useful,
14  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
15  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  *      GNU General Public License for more details.
17  *
18  *      You should have received a copy of the GNU General Public License
19  *      along with this program; if not, write to the Free Software
20  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21  *
22  *  This file implements the usbfs/x/y files, where
23  *  x is the bus number and y the device number.
24  *
25  *  It allows user space programs/"drivers" to communicate directly
26  *  with USB devices without intervening kernel driver.
27  *
28  *  Revision history
29  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
30  *    04.01.2000   0.2   Turned into its own filesystem
31  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
32  *    			 (CAN-2005-3055)
33  */
34 
35 /*****************************************************************************/
36 
37 #include <linux/fs.h>
38 #include <linux/mm.h>
39 #include <linux/slab.h>
40 #include <linux/signal.h>
41 #include <linux/poll.h>
42 #include <linux/module.h>
43 #include <linux/string.h>
44 #include <linux/usb.h>
45 #include <linux/usbdevice_fs.h>
46 #include <linux/usb/hcd.h>	/* for usbcore internals */
47 #include <linux/cdev.h>
48 #include <linux/notifier.h>
49 #include <linux/security.h>
50 #include <linux/user_namespace.h>
51 #include <linux/scatterlist.h>
52 #include <linux/uaccess.h>
53 #include <asm/byteorder.h>
54 #include <linux/moduleparam.h>
55 
56 #include "usb.h"
57 
58 #define USB_MAXBUS			64
59 #define USB_DEVICE_MAX			(USB_MAXBUS * 128)
60 #define USB_SG_SIZE			16384 /* split-size for large txs */
61 
62 /* Mutual exclusion for removal, open, and release */
63 DEFINE_MUTEX(usbfs_mutex);
64 
65 struct usb_dev_state {
66 	struct list_head list;      /* state list */
67 	struct usb_device *dev;
68 	struct file *file;
69 	spinlock_t lock;            /* protects the async urb lists */
70 	struct list_head async_pending;
71 	struct list_head async_completed;
72 	wait_queue_head_t wait;     /* wake up if a request completed */
73 	unsigned int discsignr;
74 	struct pid *disc_pid;
75 	const struct cred *cred;
76 	void __user *disccontext;
77 	unsigned long ifclaimed;
78 	u32 secid;
79 	u32 disabled_bulk_eps;
80 };
81 
82 struct async {
83 	struct list_head asynclist;
84 	struct usb_dev_state *ps;
85 	struct pid *pid;
86 	const struct cred *cred;
87 	unsigned int signr;
88 	unsigned int ifnum;
89 	void __user *userbuffer;
90 	void __user *userurb;
91 	struct urb *urb;
92 	unsigned int mem_usage;
93 	int status;
94 	u32 secid;
95 	u8 bulk_addr;
96 	u8 bulk_status;
97 };
98 
99 static bool usbfs_snoop;
100 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
101 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
102 
103 #define snoop(dev, format, arg...)				\
104 	do {							\
105 		if (usbfs_snoop)				\
106 			dev_info(dev, format, ## arg);		\
107 	} while (0)
108 
109 enum snoop_when {
110 	SUBMIT, COMPLETE
111 };
112 
113 #define USB_DEVICE_DEV		MKDEV(USB_DEVICE_MAJOR, 0)
114 
115 /* Limit on the total amount of memory we can allocate for transfers */
116 static u32 usbfs_memory_mb = 16;
117 module_param(usbfs_memory_mb, uint, 0644);
118 MODULE_PARM_DESC(usbfs_memory_mb,
119 		"maximum MB allowed for usbfs buffers (0 = no limit)");
120 
121 /* Hard limit, necessary to avoid arithmetic overflow */
122 #define USBFS_XFER_MAX         (UINT_MAX / 2 - 1000000)
123 
124 static atomic64_t usbfs_memory_usage;	/* Total memory currently allocated */
125 
126 /* Check whether it's okay to allocate more memory for a transfer */
usbfs_increase_memory_usage(u64 amount)127 static int usbfs_increase_memory_usage(u64 amount)
128 {
129 	u64 lim;
130 
131 	lim = ACCESS_ONCE(usbfs_memory_mb);
132 	lim <<= 20;
133 
134 	atomic64_add(amount, &usbfs_memory_usage);
135 
136 	if (lim > 0 && atomic64_read(&usbfs_memory_usage) > lim) {
137 		atomic64_sub(amount, &usbfs_memory_usage);
138 		return -ENOMEM;
139 	}
140 
141 	return 0;
142 }
143 
144 /* Memory for a transfer is being deallocated */
usbfs_decrease_memory_usage(u64 amount)145 static void usbfs_decrease_memory_usage(u64 amount)
146 {
147 	atomic64_sub(amount, &usbfs_memory_usage);
148 }
149 
connected(struct usb_dev_state * ps)150 static int connected(struct usb_dev_state *ps)
151 {
152 	return (!list_empty(&ps->list) &&
153 			ps->dev->state != USB_STATE_NOTATTACHED);
154 }
155 
usbdev_lseek(struct file * file,loff_t offset,int orig)156 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
157 {
158 	loff_t ret;
159 
160 	mutex_lock(&file_inode(file)->i_mutex);
161 
162 	switch (orig) {
163 	case 0:
164 		file->f_pos = offset;
165 		ret = file->f_pos;
166 		break;
167 	case 1:
168 		file->f_pos += offset;
169 		ret = file->f_pos;
170 		break;
171 	case 2:
172 	default:
173 		ret = -EINVAL;
174 	}
175 
176 	mutex_unlock(&file_inode(file)->i_mutex);
177 	return ret;
178 }
179 
usbdev_read(struct file * file,char __user * buf,size_t nbytes,loff_t * ppos)180 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
181 			   loff_t *ppos)
182 {
183 	struct usb_dev_state *ps = file->private_data;
184 	struct usb_device *dev = ps->dev;
185 	ssize_t ret = 0;
186 	unsigned len;
187 	loff_t pos;
188 	int i;
189 
190 	pos = *ppos;
191 	usb_lock_device(dev);
192 	if (!connected(ps)) {
193 		ret = -ENODEV;
194 		goto err;
195 	} else if (pos < 0) {
196 		ret = -EINVAL;
197 		goto err;
198 	}
199 
200 	if (pos < sizeof(struct usb_device_descriptor)) {
201 		/* 18 bytes - fits on the stack */
202 		struct usb_device_descriptor temp_desc;
203 
204 		memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
205 		le16_to_cpus(&temp_desc.bcdUSB);
206 		le16_to_cpus(&temp_desc.idVendor);
207 		le16_to_cpus(&temp_desc.idProduct);
208 		le16_to_cpus(&temp_desc.bcdDevice);
209 
210 		len = sizeof(struct usb_device_descriptor) - pos;
211 		if (len > nbytes)
212 			len = nbytes;
213 		if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
214 			ret = -EFAULT;
215 			goto err;
216 		}
217 
218 		*ppos += len;
219 		buf += len;
220 		nbytes -= len;
221 		ret += len;
222 	}
223 
224 	pos = sizeof(struct usb_device_descriptor);
225 	for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
226 		struct usb_config_descriptor *config =
227 			(struct usb_config_descriptor *)dev->rawdescriptors[i];
228 		unsigned int length = le16_to_cpu(config->wTotalLength);
229 
230 		if (*ppos < pos + length) {
231 
232 			/* The descriptor may claim to be longer than it
233 			 * really is.  Here is the actual allocated length. */
234 			unsigned alloclen =
235 				le16_to_cpu(dev->config[i].desc.wTotalLength);
236 
237 			len = length - (*ppos - pos);
238 			if (len > nbytes)
239 				len = nbytes;
240 
241 			/* Simply don't write (skip over) unallocated parts */
242 			if (alloclen > (*ppos - pos)) {
243 				alloclen -= (*ppos - pos);
244 				if (copy_to_user(buf,
245 				    dev->rawdescriptors[i] + (*ppos - pos),
246 				    min(len, alloclen))) {
247 					ret = -EFAULT;
248 					goto err;
249 				}
250 			}
251 
252 			*ppos += len;
253 			buf += len;
254 			nbytes -= len;
255 			ret += len;
256 		}
257 
258 		pos += length;
259 	}
260 
261 err:
262 	usb_unlock_device(dev);
263 	return ret;
264 }
265 
266 /*
267  * async list handling
268  */
269 
alloc_async(unsigned int numisoframes)270 static struct async *alloc_async(unsigned int numisoframes)
271 {
272 	struct async *as;
273 
274 	as = kzalloc(sizeof(struct async), GFP_KERNEL);
275 	if (!as)
276 		return NULL;
277 	as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
278 	if (!as->urb) {
279 		kfree(as);
280 		return NULL;
281 	}
282 	return as;
283 }
284 
free_async(struct async * as)285 static void free_async(struct async *as)
286 {
287 	int i;
288 
289 	put_pid(as->pid);
290 	if (as->cred)
291 		put_cred(as->cred);
292 	for (i = 0; i < as->urb->num_sgs; i++) {
293 		if (sg_page(&as->urb->sg[i]))
294 			kfree(sg_virt(&as->urb->sg[i]));
295 	}
296 	kfree(as->urb->sg);
297 	kfree(as->urb->transfer_buffer);
298 	kfree(as->urb->setup_packet);
299 	usb_free_urb(as->urb);
300 	usbfs_decrease_memory_usage(as->mem_usage);
301 	kfree(as);
302 }
303 
async_newpending(struct async * as)304 static void async_newpending(struct async *as)
305 {
306 	struct usb_dev_state *ps = as->ps;
307 	unsigned long flags;
308 
309 	spin_lock_irqsave(&ps->lock, flags);
310 	list_add_tail(&as->asynclist, &ps->async_pending);
311 	spin_unlock_irqrestore(&ps->lock, flags);
312 }
313 
async_removepending(struct async * as)314 static void async_removepending(struct async *as)
315 {
316 	struct usb_dev_state *ps = as->ps;
317 	unsigned long flags;
318 
319 	spin_lock_irqsave(&ps->lock, flags);
320 	list_del_init(&as->asynclist);
321 	spin_unlock_irqrestore(&ps->lock, flags);
322 }
323 
async_getcompleted(struct usb_dev_state * ps)324 static struct async *async_getcompleted(struct usb_dev_state *ps)
325 {
326 	unsigned long flags;
327 	struct async *as = NULL;
328 
329 	spin_lock_irqsave(&ps->lock, flags);
330 	if (!list_empty(&ps->async_completed)) {
331 		as = list_entry(ps->async_completed.next, struct async,
332 				asynclist);
333 		list_del_init(&as->asynclist);
334 	}
335 	spin_unlock_irqrestore(&ps->lock, flags);
336 	return as;
337 }
338 
async_getpending(struct usb_dev_state * ps,void __user * userurb)339 static struct async *async_getpending(struct usb_dev_state *ps,
340 					     void __user *userurb)
341 {
342 	struct async *as;
343 
344 	list_for_each_entry(as, &ps->async_pending, asynclist)
345 		if (as->userurb == userurb) {
346 			list_del_init(&as->asynclist);
347 			return as;
348 		}
349 
350 	return NULL;
351 }
352 
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)353 static void snoop_urb(struct usb_device *udev,
354 		void __user *userurb, int pipe, unsigned length,
355 		int timeout_or_status, enum snoop_when when,
356 		unsigned char *data, unsigned data_len)
357 {
358 	static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
359 	static const char *dirs[] = {"out", "in"};
360 	int ep;
361 	const char *t, *d;
362 
363 	if (!usbfs_snoop)
364 		return;
365 
366 	ep = usb_pipeendpoint(pipe);
367 	t = types[usb_pipetype(pipe)];
368 	d = dirs[!!usb_pipein(pipe)];
369 
370 	if (userurb) {		/* Async */
371 		if (when == SUBMIT)
372 			dev_info(&udev->dev, "userurb %px, ep%d %s-%s, "
373 					"length %u\n",
374 					userurb, ep, t, d, length);
375 		else
376 			dev_info(&udev->dev, "userurb %px, ep%d %s-%s, "
377 					"actual_length %u status %d\n",
378 					userurb, ep, t, d, length,
379 					timeout_or_status);
380 	} else {
381 		if (when == SUBMIT)
382 			dev_info(&udev->dev, "ep%d %s-%s, length %u, "
383 					"timeout %d\n",
384 					ep, t, d, length, timeout_or_status);
385 		else
386 			dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
387 					"status %d\n",
388 					ep, t, d, length, timeout_or_status);
389 	}
390 
391 	if (data && data_len > 0) {
392 		print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
393 			data, data_len, 1);
394 	}
395 }
396 
snoop_urb_data(struct urb * urb,unsigned len)397 static void snoop_urb_data(struct urb *urb, unsigned len)
398 {
399 	int i, size;
400 
401 	if (!usbfs_snoop)
402 		return;
403 
404 	if (urb->num_sgs == 0) {
405 		print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
406 			urb->transfer_buffer, len, 1);
407 		return;
408 	}
409 
410 	for (i = 0; i < urb->num_sgs && len; i++) {
411 		size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
412 		print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
413 			sg_virt(&urb->sg[i]), size, 1);
414 		len -= size;
415 	}
416 }
417 
copy_urb_data_to_user(u8 __user * userbuffer,struct urb * urb)418 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
419 {
420 	unsigned i, len, size;
421 
422 	if (urb->number_of_packets > 0)		/* Isochronous */
423 		len = urb->transfer_buffer_length;
424 	else					/* Non-Isoc */
425 		len = urb->actual_length;
426 
427 	if (urb->num_sgs == 0) {
428 		if (copy_to_user(userbuffer, urb->transfer_buffer, len))
429 			return -EFAULT;
430 		return 0;
431 	}
432 
433 	for (i = 0; i < urb->num_sgs && len; i++) {
434 		size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
435 		if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
436 			return -EFAULT;
437 		userbuffer += size;
438 		len -= size;
439 	}
440 
441 	return 0;
442 }
443 
444 #define AS_CONTINUATION	1
445 #define AS_UNLINK	2
446 
cancel_bulk_urbs(struct usb_dev_state * ps,unsigned bulk_addr)447 static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
448 __releases(ps->lock)
449 __acquires(ps->lock)
450 {
451 	struct urb *urb;
452 	struct async *as;
453 
454 	/* Mark all the pending URBs that match bulk_addr, up to but not
455 	 * including the first one without AS_CONTINUATION.  If such an
456 	 * URB is encountered then a new transfer has already started so
457 	 * the endpoint doesn't need to be disabled; otherwise it does.
458 	 */
459 	list_for_each_entry(as, &ps->async_pending, asynclist) {
460 		if (as->bulk_addr == bulk_addr) {
461 			if (as->bulk_status != AS_CONTINUATION)
462 				goto rescan;
463 			as->bulk_status = AS_UNLINK;
464 			as->bulk_addr = 0;
465 		}
466 	}
467 	ps->disabled_bulk_eps |= (1 << bulk_addr);
468 
469 	/* Now carefully unlink all the marked pending URBs */
470  rescan:
471 	list_for_each_entry(as, &ps->async_pending, asynclist) {
472 		if (as->bulk_status == AS_UNLINK) {
473 			as->bulk_status = 0;		/* Only once */
474 			urb = as->urb;
475 			usb_get_urb(urb);
476 			spin_unlock(&ps->lock);		/* Allow completions */
477 			usb_unlink_urb(urb);
478 			usb_put_urb(urb);
479 			spin_lock(&ps->lock);
480 			goto rescan;
481 		}
482 	}
483 }
484 
async_completed(struct urb * urb)485 static void async_completed(struct urb *urb)
486 {
487 	struct async *as = urb->context;
488 	struct usb_dev_state *ps = as->ps;
489 	struct siginfo sinfo;
490 	struct pid *pid = NULL;
491 	u32 secid = 0;
492 	const struct cred *cred = NULL;
493 	int signr;
494 
495 	spin_lock(&ps->lock);
496 	list_move_tail(&as->asynclist, &ps->async_completed);
497 	as->status = urb->status;
498 	signr = as->signr;
499 	if (signr) {
500 		memset(&sinfo, 0, sizeof(sinfo));
501 		sinfo.si_signo = as->signr;
502 		sinfo.si_errno = as->status;
503 		sinfo.si_code = SI_ASYNCIO;
504 		sinfo.si_addr = as->userurb;
505 		pid = get_pid(as->pid);
506 		cred = get_cred(as->cred);
507 		secid = as->secid;
508 	}
509 	snoop(&urb->dev->dev, "urb complete\n");
510 	snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
511 			as->status, COMPLETE, NULL, 0);
512 	if ((urb->transfer_flags & URB_DIR_MASK) == URB_DIR_IN)
513 		snoop_urb_data(urb, urb->actual_length);
514 
515 	if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
516 			as->status != -ENOENT)
517 		cancel_bulk_urbs(ps, as->bulk_addr);
518 
519 	wake_up(&ps->wait);
520 	spin_unlock(&ps->lock);
521 
522 	if (signr) {
523 		kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid);
524 		put_pid(pid);
525 		put_cred(cred);
526 	}
527 }
528 
destroy_async(struct usb_dev_state * ps,struct list_head * list)529 static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
530 {
531 	struct urb *urb;
532 	struct async *as;
533 	unsigned long flags;
534 
535 	spin_lock_irqsave(&ps->lock, flags);
536 	while (!list_empty(list)) {
537 		as = list_entry(list->next, struct async, asynclist);
538 		list_del_init(&as->asynclist);
539 		urb = as->urb;
540 		usb_get_urb(urb);
541 
542 		/* drop the spinlock so the completion handler can run */
543 		spin_unlock_irqrestore(&ps->lock, flags);
544 		usb_kill_urb(urb);
545 		usb_put_urb(urb);
546 		spin_lock_irqsave(&ps->lock, flags);
547 	}
548 	spin_unlock_irqrestore(&ps->lock, flags);
549 }
550 
destroy_async_on_interface(struct usb_dev_state * ps,unsigned int ifnum)551 static void destroy_async_on_interface(struct usb_dev_state *ps,
552 				       unsigned int ifnum)
553 {
554 	struct list_head *p, *q, hitlist;
555 	unsigned long flags;
556 
557 	INIT_LIST_HEAD(&hitlist);
558 	spin_lock_irqsave(&ps->lock, flags);
559 	list_for_each_safe(p, q, &ps->async_pending)
560 		if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
561 			list_move_tail(p, &hitlist);
562 	spin_unlock_irqrestore(&ps->lock, flags);
563 	destroy_async(ps, &hitlist);
564 }
565 
destroy_all_async(struct usb_dev_state * ps)566 static void destroy_all_async(struct usb_dev_state *ps)
567 {
568 	destroy_async(ps, &ps->async_pending);
569 }
570 
571 /*
572  * interface claims are made only at the request of user level code,
573  * which can also release them (explicitly or by closing files).
574  * they're also undone when devices disconnect.
575  */
576 
driver_probe(struct usb_interface * intf,const struct usb_device_id * id)577 static int driver_probe(struct usb_interface *intf,
578 			const struct usb_device_id *id)
579 {
580 	return -ENODEV;
581 }
582 
driver_disconnect(struct usb_interface * intf)583 static void driver_disconnect(struct usb_interface *intf)
584 {
585 	struct usb_dev_state *ps = usb_get_intfdata(intf);
586 	unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
587 
588 	if (!ps)
589 		return;
590 
591 	/* NOTE:  this relies on usbcore having canceled and completed
592 	 * all pending I/O requests; 2.6 does that.
593 	 */
594 
595 	if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
596 		clear_bit(ifnum, &ps->ifclaimed);
597 	else
598 		dev_warn(&intf->dev, "interface number %u out of range\n",
599 			 ifnum);
600 
601 	usb_set_intfdata(intf, NULL);
602 
603 	/* force async requests to complete */
604 	destroy_async_on_interface(ps, ifnum);
605 }
606 
607 /* The following routines are merely placeholders.  There is no way
608  * to inform a user task about suspend or resumes.
609  */
driver_suspend(struct usb_interface * intf,pm_message_t msg)610 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
611 {
612 	return 0;
613 }
614 
driver_resume(struct usb_interface * intf)615 static int driver_resume(struct usb_interface *intf)
616 {
617 	return 0;
618 }
619 
620 struct usb_driver usbfs_driver = {
621 	.name =		"usbfs",
622 	.probe =	driver_probe,
623 	.disconnect =	driver_disconnect,
624 	.suspend =	driver_suspend,
625 	.resume =	driver_resume,
626 };
627 
claimintf(struct usb_dev_state * ps,unsigned int ifnum)628 static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
629 {
630 	struct usb_device *dev = ps->dev;
631 	struct usb_interface *intf;
632 	int err;
633 
634 	if (ifnum >= 8*sizeof(ps->ifclaimed))
635 		return -EINVAL;
636 	/* already claimed */
637 	if (test_bit(ifnum, &ps->ifclaimed))
638 		return 0;
639 
640 	intf = usb_ifnum_to_if(dev, ifnum);
641 	if (!intf)
642 		err = -ENOENT;
643 	else
644 		err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
645 	if (err == 0)
646 		set_bit(ifnum, &ps->ifclaimed);
647 	return err;
648 }
649 
releaseintf(struct usb_dev_state * ps,unsigned int ifnum)650 static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
651 {
652 	struct usb_device *dev;
653 	struct usb_interface *intf;
654 	int err;
655 
656 	err = -EINVAL;
657 	if (ifnum >= 8*sizeof(ps->ifclaimed))
658 		return err;
659 	dev = ps->dev;
660 	intf = usb_ifnum_to_if(dev, ifnum);
661 	if (!intf)
662 		err = -ENOENT;
663 	else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
664 		usb_driver_release_interface(&usbfs_driver, intf);
665 		err = 0;
666 	}
667 	return err;
668 }
669 
checkintf(struct usb_dev_state * ps,unsigned int ifnum)670 static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
671 {
672 	if (ps->dev->state != USB_STATE_CONFIGURED)
673 		return -EHOSTUNREACH;
674 	if (ifnum >= 8*sizeof(ps->ifclaimed))
675 		return -EINVAL;
676 	if (test_bit(ifnum, &ps->ifclaimed))
677 		return 0;
678 	/* if not yet claimed, claim it for the driver */
679 	dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
680 		 "interface %u before use\n", task_pid_nr(current),
681 		 current->comm, ifnum);
682 	return claimintf(ps, ifnum);
683 }
684 
findintfep(struct usb_device * dev,unsigned int ep)685 static int findintfep(struct usb_device *dev, unsigned int ep)
686 {
687 	unsigned int i, j, e;
688 	struct usb_interface *intf;
689 	struct usb_host_interface *alts;
690 	struct usb_endpoint_descriptor *endpt;
691 
692 	if (ep & ~(USB_DIR_IN|0xf))
693 		return -EINVAL;
694 	if (!dev->actconfig)
695 		return -ESRCH;
696 	for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
697 		intf = dev->actconfig->interface[i];
698 		for (j = 0; j < intf->num_altsetting; j++) {
699 			alts = &intf->altsetting[j];
700 			for (e = 0; e < alts->desc.bNumEndpoints; e++) {
701 				endpt = &alts->endpoint[e].desc;
702 				if (endpt->bEndpointAddress == ep)
703 					return alts->desc.bInterfaceNumber;
704 			}
705 		}
706 	}
707 	return -ENOENT;
708 }
709 
check_ctrlrecip(struct usb_dev_state * ps,unsigned int requesttype,unsigned int request,unsigned int index)710 static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
711 			   unsigned int request, unsigned int index)
712 {
713 	int ret = 0;
714 	struct usb_host_interface *alt_setting;
715 
716 	if (ps->dev->state != USB_STATE_UNAUTHENTICATED
717 	 && ps->dev->state != USB_STATE_ADDRESS
718 	 && ps->dev->state != USB_STATE_CONFIGURED)
719 		return -EHOSTUNREACH;
720 	if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
721 		return 0;
722 
723 	/*
724 	 * check for the special corner case 'get_device_id' in the printer
725 	 * class specification, which we always want to allow as it is used
726 	 * to query things like ink level, etc.
727 	 */
728 	if (requesttype == 0xa1 && request == 0) {
729 		alt_setting = usb_find_alt_setting(ps->dev->actconfig,
730 						   index >> 8, index & 0xff);
731 		if (alt_setting
732 		 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
733 			return 0;
734 	}
735 
736 	index &= 0xff;
737 	switch (requesttype & USB_RECIP_MASK) {
738 	case USB_RECIP_ENDPOINT:
739 		if ((index & ~USB_DIR_IN) == 0)
740 			return 0;
741 		ret = findintfep(ps->dev, index);
742 		if (ret < 0) {
743 			/*
744 			 * Some not fully compliant Win apps seem to get
745 			 * index wrong and have the endpoint number here
746 			 * rather than the endpoint address (with the
747 			 * correct direction). Win does let this through,
748 			 * so we'll not reject it here but leave it to
749 			 * the device to not break KVM. But we warn.
750 			 */
751 			ret = findintfep(ps->dev, index ^ 0x80);
752 			if (ret >= 0)
753 				dev_info(&ps->dev->dev,
754 					"%s: process %i (%s) requesting ep %02x but needs %02x\n",
755 					__func__, task_pid_nr(current),
756 					current->comm, index, index ^ 0x80);
757 		}
758 		if (ret >= 0)
759 			ret = checkintf(ps, ret);
760 		break;
761 
762 	case USB_RECIP_INTERFACE:
763 		ret = checkintf(ps, index);
764 		break;
765 	}
766 	return ret;
767 }
768 
ep_to_host_endpoint(struct usb_device * dev,unsigned char ep)769 static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
770 						     unsigned char ep)
771 {
772 	if (ep & USB_ENDPOINT_DIR_MASK)
773 		return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
774 	else
775 		return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
776 }
777 
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)778 static int parse_usbdevfs_streams(struct usb_dev_state *ps,
779 				  struct usbdevfs_streams __user *streams,
780 				  unsigned int *num_streams_ret,
781 				  unsigned int *num_eps_ret,
782 				  struct usb_host_endpoint ***eps_ret,
783 				  struct usb_interface **intf_ret)
784 {
785 	unsigned int i, num_streams, num_eps;
786 	struct usb_host_endpoint **eps;
787 	struct usb_interface *intf = NULL;
788 	unsigned char ep;
789 	int ifnum, ret;
790 
791 	if (get_user(num_streams, &streams->num_streams) ||
792 	    get_user(num_eps, &streams->num_eps))
793 		return -EFAULT;
794 
795 	if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
796 		return -EINVAL;
797 
798 	/* The XHCI controller allows max 2 ^ 16 streams */
799 	if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
800 		return -EINVAL;
801 
802 	eps = kmalloc(num_eps * sizeof(*eps), GFP_KERNEL);
803 	if (!eps)
804 		return -ENOMEM;
805 
806 	for (i = 0; i < num_eps; i++) {
807 		if (get_user(ep, &streams->eps[i])) {
808 			ret = -EFAULT;
809 			goto error;
810 		}
811 		eps[i] = ep_to_host_endpoint(ps->dev, ep);
812 		if (!eps[i]) {
813 			ret = -EINVAL;
814 			goto error;
815 		}
816 
817 		/* usb_alloc/free_streams operate on an usb_interface */
818 		ifnum = findintfep(ps->dev, ep);
819 		if (ifnum < 0) {
820 			ret = ifnum;
821 			goto error;
822 		}
823 
824 		if (i == 0) {
825 			ret = checkintf(ps, ifnum);
826 			if (ret < 0)
827 				goto error;
828 			intf = usb_ifnum_to_if(ps->dev, ifnum);
829 		} else {
830 			/* Verify all eps belong to the same interface */
831 			if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
832 				ret = -EINVAL;
833 				goto error;
834 			}
835 		}
836 	}
837 
838 	if (num_streams_ret)
839 		*num_streams_ret = num_streams;
840 	*num_eps_ret = num_eps;
841 	*eps_ret = eps;
842 	*intf_ret = intf;
843 
844 	return 0;
845 
846 error:
847 	kfree(eps);
848 	return ret;
849 }
850 
match_devt(struct device * dev,void * data)851 static int match_devt(struct device *dev, void *data)
852 {
853 	return dev->devt == (dev_t) (unsigned long) data;
854 }
855 
usbdev_lookup_by_devt(dev_t devt)856 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
857 {
858 	struct device *dev;
859 
860 	dev = bus_find_device(&usb_bus_type, NULL,
861 			      (void *) (unsigned long) devt, match_devt);
862 	if (!dev)
863 		return NULL;
864 	return container_of(dev, struct usb_device, dev);
865 }
866 
867 /*
868  * file operations
869  */
usbdev_open(struct inode * inode,struct file * file)870 static int usbdev_open(struct inode *inode, struct file *file)
871 {
872 	struct usb_device *dev = NULL;
873 	struct usb_dev_state *ps;
874 	int ret;
875 
876 	ret = -ENOMEM;
877 	ps = kmalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
878 	if (!ps)
879 		goto out_free_ps;
880 
881 	ret = -ENODEV;
882 
883 	/* Protect against simultaneous removal or release */
884 	mutex_lock(&usbfs_mutex);
885 
886 	/* usbdev device-node */
887 	if (imajor(inode) == USB_DEVICE_MAJOR)
888 		dev = usbdev_lookup_by_devt(inode->i_rdev);
889 
890 	mutex_unlock(&usbfs_mutex);
891 
892 	if (!dev)
893 		goto out_free_ps;
894 
895 	usb_lock_device(dev);
896 	if (dev->state == USB_STATE_NOTATTACHED)
897 		goto out_unlock_device;
898 
899 	ret = usb_autoresume_device(dev);
900 	if (ret)
901 		goto out_unlock_device;
902 
903 	ps->dev = dev;
904 	ps->file = file;
905 	spin_lock_init(&ps->lock);
906 	INIT_LIST_HEAD(&ps->list);
907 	INIT_LIST_HEAD(&ps->async_pending);
908 	INIT_LIST_HEAD(&ps->async_completed);
909 	init_waitqueue_head(&ps->wait);
910 	ps->discsignr = 0;
911 	ps->disc_pid = get_pid(task_pid(current));
912 	ps->cred = get_current_cred();
913 	ps->disccontext = NULL;
914 	ps->ifclaimed = 0;
915 	security_task_getsecid(current, &ps->secid);
916 	smp_wmb();
917 	list_add_tail(&ps->list, &dev->filelist);
918 	file->private_data = ps;
919 	usb_unlock_device(dev);
920 	snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
921 			current->comm);
922 	return ret;
923 
924  out_unlock_device:
925 	usb_unlock_device(dev);
926 	usb_put_dev(dev);
927  out_free_ps:
928 	kfree(ps);
929 	return ret;
930 }
931 
usbdev_release(struct inode * inode,struct file * file)932 static int usbdev_release(struct inode *inode, struct file *file)
933 {
934 	struct usb_dev_state *ps = file->private_data;
935 	struct usb_device *dev = ps->dev;
936 	unsigned int ifnum;
937 	struct async *as;
938 
939 	usb_lock_device(dev);
940 	usb_hub_release_all_ports(dev, ps);
941 
942 	list_del_init(&ps->list);
943 
944 	for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
945 			ifnum++) {
946 		if (test_bit(ifnum, &ps->ifclaimed))
947 			releaseintf(ps, ifnum);
948 	}
949 	destroy_all_async(ps);
950 	usb_autosuspend_device(dev);
951 	usb_unlock_device(dev);
952 	usb_put_dev(dev);
953 	put_pid(ps->disc_pid);
954 	put_cred(ps->cred);
955 
956 	as = async_getcompleted(ps);
957 	while (as) {
958 		free_async(as);
959 		as = async_getcompleted(ps);
960 	}
961 	kfree(ps);
962 	return 0;
963 }
964 
proc_control(struct usb_dev_state * ps,void __user * arg)965 static int proc_control(struct usb_dev_state *ps, void __user *arg)
966 {
967 	struct usb_device *dev = ps->dev;
968 	struct usbdevfs_ctrltransfer ctrl;
969 	unsigned int tmo;
970 	unsigned char *tbuf;
971 	unsigned wLength;
972 	int i, pipe, ret;
973 
974 	if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
975 		return -EFAULT;
976 	ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
977 			      ctrl.wIndex);
978 	if (ret)
979 		return ret;
980 	wLength = ctrl.wLength;		/* To suppress 64k PAGE_SIZE warning */
981 	if (wLength > PAGE_SIZE)
982 		return -EINVAL;
983 	ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
984 			sizeof(struct usb_ctrlrequest));
985 	if (ret)
986 		return ret;
987 	tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
988 	if (!tbuf) {
989 		ret = -ENOMEM;
990 		goto done;
991 	}
992 	tmo = ctrl.timeout;
993 	snoop(&dev->dev, "control urb: bRequestType=%02x "
994 		"bRequest=%02x wValue=%04x "
995 		"wIndex=%04x wLength=%04x\n",
996 		ctrl.bRequestType, ctrl.bRequest, ctrl.wValue,
997 		ctrl.wIndex, ctrl.wLength);
998 	if (ctrl.bRequestType & 0x80) {
999 		if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
1000 					       ctrl.wLength)) {
1001 			ret = -EINVAL;
1002 			goto done;
1003 		}
1004 		pipe = usb_rcvctrlpipe(dev, 0);
1005 		snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
1006 
1007 		usb_unlock_device(dev);
1008 		i = usb_control_msg(dev, pipe, ctrl.bRequest,
1009 				    ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1010 				    tbuf, ctrl.wLength, tmo);
1011 		usb_lock_device(dev);
1012 		snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
1013 			  tbuf, max(i, 0));
1014 		if ((i > 0) && ctrl.wLength) {
1015 			if (copy_to_user(ctrl.data, tbuf, i)) {
1016 				ret = -EFAULT;
1017 				goto done;
1018 			}
1019 		}
1020 	} else {
1021 		if (ctrl.wLength) {
1022 			if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
1023 				ret = -EFAULT;
1024 				goto done;
1025 			}
1026 		}
1027 		pipe = usb_sndctrlpipe(dev, 0);
1028 		snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
1029 			tbuf, ctrl.wLength);
1030 
1031 		usb_unlock_device(dev);
1032 		i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
1033 				    ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1034 				    tbuf, ctrl.wLength, tmo);
1035 		usb_lock_device(dev);
1036 		snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
1037 	}
1038 	if (i < 0 && i != -EPIPE) {
1039 		dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1040 			   "failed cmd %s rqt %u rq %u len %u ret %d\n",
1041 			   current->comm, ctrl.bRequestType, ctrl.bRequest,
1042 			   ctrl.wLength, i);
1043 	}
1044 	ret = i;
1045  done:
1046 	free_page((unsigned long) tbuf);
1047 	usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1048 			sizeof(struct usb_ctrlrequest));
1049 	return ret;
1050 }
1051 
proc_bulk(struct usb_dev_state * ps,void __user * arg)1052 static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1053 {
1054 	struct usb_device *dev = ps->dev;
1055 	struct usbdevfs_bulktransfer bulk;
1056 	unsigned int tmo, len1, pipe;
1057 	int len2;
1058 	unsigned char *tbuf;
1059 	int i, ret;
1060 
1061 	if (copy_from_user(&bulk, arg, sizeof(bulk)))
1062 		return -EFAULT;
1063 	ret = findintfep(ps->dev, bulk.ep);
1064 	if (ret < 0)
1065 		return ret;
1066 	ret = checkintf(ps, ret);
1067 	if (ret)
1068 		return ret;
1069 	if (bulk.ep & USB_DIR_IN)
1070 		pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
1071 	else
1072 		pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
1073 	if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
1074 		return -EINVAL;
1075 	len1 = bulk.len;
1076 	if (len1 >= (INT_MAX - sizeof(struct urb)))
1077 		return -EINVAL;
1078 	ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1079 	if (ret)
1080 		return ret;
1081 	tbuf = kmalloc(len1, GFP_KERNEL);
1082 	if (!tbuf) {
1083 		ret = -ENOMEM;
1084 		goto done;
1085 	}
1086 	tmo = bulk.timeout;
1087 	if (bulk.ep & 0x80) {
1088 		if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
1089 			ret = -EINVAL;
1090 			goto done;
1091 		}
1092 		snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1093 
1094 		usb_unlock_device(dev);
1095 		i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1096 		usb_lock_device(dev);
1097 		snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1098 
1099 		if (!i && len2) {
1100 			if (copy_to_user(bulk.data, tbuf, len2)) {
1101 				ret = -EFAULT;
1102 				goto done;
1103 			}
1104 		}
1105 	} else {
1106 		if (len1) {
1107 			if (copy_from_user(tbuf, bulk.data, len1)) {
1108 				ret = -EFAULT;
1109 				goto done;
1110 			}
1111 		}
1112 		snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1113 
1114 		usb_unlock_device(dev);
1115 		i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1116 		usb_lock_device(dev);
1117 		snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1118 	}
1119 	ret = (i < 0 ? i : len2);
1120  done:
1121 	kfree(tbuf);
1122 	usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1123 	return ret;
1124 }
1125 
check_reset_of_active_ep(struct usb_device * udev,unsigned int epnum,char * ioctl_name)1126 static void check_reset_of_active_ep(struct usb_device *udev,
1127 		unsigned int epnum, char *ioctl_name)
1128 {
1129 	struct usb_host_endpoint **eps;
1130 	struct usb_host_endpoint *ep;
1131 
1132 	eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1133 	ep = eps[epnum & 0x0f];
1134 	if (ep && !list_empty(&ep->urb_list))
1135 		dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1136 				task_pid_nr(current), current->comm,
1137 				ioctl_name, epnum);
1138 }
1139 
proc_resetep(struct usb_dev_state * ps,void __user * arg)1140 static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1141 {
1142 	unsigned int ep;
1143 	int ret;
1144 
1145 	if (get_user(ep, (unsigned int __user *)arg))
1146 		return -EFAULT;
1147 	ret = findintfep(ps->dev, ep);
1148 	if (ret < 0)
1149 		return ret;
1150 	ret = checkintf(ps, ret);
1151 	if (ret)
1152 		return ret;
1153 	check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1154 	usb_reset_endpoint(ps->dev, ep);
1155 	return 0;
1156 }
1157 
proc_clearhalt(struct usb_dev_state * ps,void __user * arg)1158 static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1159 {
1160 	unsigned int ep;
1161 	int pipe;
1162 	int ret;
1163 
1164 	if (get_user(ep, (unsigned int __user *)arg))
1165 		return -EFAULT;
1166 	ret = findintfep(ps->dev, ep);
1167 	if (ret < 0)
1168 		return ret;
1169 	ret = checkintf(ps, ret);
1170 	if (ret)
1171 		return ret;
1172 	check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1173 	if (ep & USB_DIR_IN)
1174 		pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1175 	else
1176 		pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1177 
1178 	return usb_clear_halt(ps->dev, pipe);
1179 }
1180 
proc_getdriver(struct usb_dev_state * ps,void __user * arg)1181 static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1182 {
1183 	struct usbdevfs_getdriver gd;
1184 	struct usb_interface *intf;
1185 	int ret;
1186 
1187 	if (copy_from_user(&gd, arg, sizeof(gd)))
1188 		return -EFAULT;
1189 	intf = usb_ifnum_to_if(ps->dev, gd.interface);
1190 	if (!intf || !intf->dev.driver)
1191 		ret = -ENODATA;
1192 	else {
1193 		strlcpy(gd.driver, intf->dev.driver->name,
1194 				sizeof(gd.driver));
1195 		ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1196 	}
1197 	return ret;
1198 }
1199 
proc_connectinfo(struct usb_dev_state * ps,void __user * arg)1200 static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1201 {
1202 	struct usbdevfs_connectinfo ci;
1203 
1204 	memset(&ci, 0, sizeof(ci));
1205 	ci.devnum = ps->dev->devnum;
1206 	ci.slow = ps->dev->speed == USB_SPEED_LOW;
1207 
1208 	if (copy_to_user(arg, &ci, sizeof(ci)))
1209 		return -EFAULT;
1210 	return 0;
1211 }
1212 
proc_resetdevice(struct usb_dev_state * ps)1213 static int proc_resetdevice(struct usb_dev_state *ps)
1214 {
1215 	return usb_reset_device(ps->dev);
1216 }
1217 
proc_setintf(struct usb_dev_state * ps,void __user * arg)1218 static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1219 {
1220 	struct usbdevfs_setinterface setintf;
1221 	int ret;
1222 
1223 	if (copy_from_user(&setintf, arg, sizeof(setintf)))
1224 		return -EFAULT;
1225 	ret = checkintf(ps, setintf.interface);
1226 	if (ret)
1227 		return ret;
1228 
1229 	destroy_async_on_interface(ps, setintf.interface);
1230 
1231 	return usb_set_interface(ps->dev, setintf.interface,
1232 			setintf.altsetting);
1233 }
1234 
proc_setconfig(struct usb_dev_state * ps,void __user * arg)1235 static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1236 {
1237 	int u;
1238 	int status = 0;
1239 	struct usb_host_config *actconfig;
1240 
1241 	if (get_user(u, (int __user *)arg))
1242 		return -EFAULT;
1243 
1244 	actconfig = ps->dev->actconfig;
1245 
1246 	/* Don't touch the device if any interfaces are claimed.
1247 	 * It could interfere with other drivers' operations, and if
1248 	 * an interface is claimed by usbfs it could easily deadlock.
1249 	 */
1250 	if (actconfig) {
1251 		int i;
1252 
1253 		for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1254 			if (usb_interface_claimed(actconfig->interface[i])) {
1255 				dev_warn(&ps->dev->dev,
1256 					"usbfs: interface %d claimed by %s "
1257 					"while '%s' sets config #%d\n",
1258 					actconfig->interface[i]
1259 						->cur_altsetting
1260 						->desc.bInterfaceNumber,
1261 					actconfig->interface[i]
1262 						->dev.driver->name,
1263 					current->comm, u);
1264 				status = -EBUSY;
1265 				break;
1266 			}
1267 		}
1268 	}
1269 
1270 	/* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1271 	 * so avoid usb_set_configuration()'s kick to sysfs
1272 	 */
1273 	if (status == 0) {
1274 		if (actconfig && actconfig->desc.bConfigurationValue == u)
1275 			status = usb_reset_configuration(ps->dev);
1276 		else
1277 			status = usb_set_configuration(ps->dev, u);
1278 	}
1279 
1280 	return status;
1281 }
1282 
proc_do_submiturb(struct usb_dev_state * ps,struct usbdevfs_urb * uurb,struct usbdevfs_iso_packet_desc __user * iso_frame_desc,void __user * arg)1283 static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1284 			struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1285 			void __user *arg)
1286 {
1287 	struct usbdevfs_iso_packet_desc *isopkt = NULL;
1288 	struct usb_host_endpoint *ep;
1289 	struct async *as = NULL;
1290 	struct usb_ctrlrequest *dr = NULL;
1291 	unsigned int u, totlen, isofrmlen;
1292 	int i, ret, num_sgs = 0, ifnum = -1;
1293 	int number_of_packets = 0;
1294 	unsigned int stream_id = 0;
1295 	void *buf;
1296 	bool is_in;
1297 	bool allow_short = false;
1298 	bool allow_zero = false;
1299 	unsigned long mask =	USBDEVFS_URB_SHORT_NOT_OK |
1300 				USBDEVFS_URB_BULK_CONTINUATION |
1301 				USBDEVFS_URB_NO_FSBR |
1302 				USBDEVFS_URB_ZERO_PACKET |
1303 				USBDEVFS_URB_NO_INTERRUPT;
1304 	/* USBDEVFS_URB_ISO_ASAP is a special case */
1305 	if (uurb->type == USBDEVFS_URB_TYPE_ISO)
1306 		mask |= USBDEVFS_URB_ISO_ASAP;
1307 
1308 	if (uurb->flags & ~mask)
1309 			return -EINVAL;
1310 
1311 	if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
1312 		return -EINVAL;
1313 	if (uurb->buffer_length > 0 && !uurb->buffer)
1314 		return -EINVAL;
1315 	if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1316 	    (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1317 		ifnum = findintfep(ps->dev, uurb->endpoint);
1318 		if (ifnum < 0)
1319 			return ifnum;
1320 		ret = checkintf(ps, ifnum);
1321 		if (ret)
1322 			return ret;
1323 	}
1324 	ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1325 	if (!ep)
1326 		return -ENOENT;
1327 	is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1328 
1329 	u = 0;
1330 	switch (uurb->type) {
1331 	case USBDEVFS_URB_TYPE_CONTROL:
1332 		if (!usb_endpoint_xfer_control(&ep->desc))
1333 			return -EINVAL;
1334 		/* min 8 byte setup packet */
1335 		if (uurb->buffer_length < 8)
1336 			return -EINVAL;
1337 		dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1338 		if (!dr)
1339 			return -ENOMEM;
1340 		if (copy_from_user(dr, uurb->buffer, 8)) {
1341 			ret = -EFAULT;
1342 			goto error;
1343 		}
1344 		if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1345 			ret = -EINVAL;
1346 			goto error;
1347 		}
1348 		ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1349 				      le16_to_cpup(&dr->wIndex));
1350 		if (ret)
1351 			goto error;
1352 		uurb->buffer_length = le16_to_cpup(&dr->wLength);
1353 		uurb->buffer += 8;
1354 		if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1355 			is_in = 1;
1356 			uurb->endpoint |= USB_DIR_IN;
1357 		} else {
1358 			is_in = 0;
1359 			uurb->endpoint &= ~USB_DIR_IN;
1360 		}
1361 		if (is_in)
1362 			allow_short = true;
1363 		snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1364 			"bRequest=%02x wValue=%04x "
1365 			"wIndex=%04x wLength=%04x\n",
1366 			dr->bRequestType, dr->bRequest,
1367 			__le16_to_cpup(&dr->wValue),
1368 			__le16_to_cpup(&dr->wIndex),
1369 			__le16_to_cpup(&dr->wLength));
1370 		u = sizeof(struct usb_ctrlrequest);
1371 		break;
1372 
1373 	case USBDEVFS_URB_TYPE_BULK:
1374 		if (!is_in)
1375 			allow_zero = true;
1376 		else
1377 			allow_short = true;
1378 		switch (usb_endpoint_type(&ep->desc)) {
1379 		case USB_ENDPOINT_XFER_CONTROL:
1380 		case USB_ENDPOINT_XFER_ISOC:
1381 			return -EINVAL;
1382 		case USB_ENDPOINT_XFER_INT:
1383 			/* allow single-shot interrupt transfers */
1384 			uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1385 			goto interrupt_urb;
1386 		}
1387 		num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1388 		if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1389 			num_sgs = 0;
1390 		if (ep->streams)
1391 			stream_id = uurb->stream_id;
1392 		break;
1393 
1394 	case USBDEVFS_URB_TYPE_INTERRUPT:
1395 		if (!usb_endpoint_xfer_int(&ep->desc))
1396 			return -EINVAL;
1397  interrupt_urb:
1398 		if (!is_in)
1399 			allow_zero = true;
1400 		else
1401 			allow_short = true;
1402 		break;
1403 
1404 	case USBDEVFS_URB_TYPE_ISO:
1405 		/* arbitrary limit */
1406 		if (uurb->number_of_packets < 1 ||
1407 		    uurb->number_of_packets > 128)
1408 			return -EINVAL;
1409 		if (!usb_endpoint_xfer_isoc(&ep->desc))
1410 			return -EINVAL;
1411 		number_of_packets = uurb->number_of_packets;
1412 		isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1413 				   number_of_packets;
1414 		isopkt = kmalloc(isofrmlen, GFP_KERNEL);
1415 		if (!isopkt)
1416 			return -ENOMEM;
1417 		if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1418 			ret = -EFAULT;
1419 			goto error;
1420 		}
1421 		for (totlen = u = 0; u < number_of_packets; u++) {
1422 			/*
1423 			 * arbitrary limit need for USB 3.0
1424 			 * bMaxBurst (0~15 allowed, 1~16 packets)
1425 			 * bmAttributes (bit 1:0, mult 0~2, 1~3 packets)
1426 			 * sizemax: 1024 * 16 * 3 = 49152
1427 			 */
1428 			if (isopkt[u].length > 49152) {
1429 				ret = -EINVAL;
1430 				goto error;
1431 			}
1432 			totlen += isopkt[u].length;
1433 		}
1434 		u *= sizeof(struct usb_iso_packet_descriptor);
1435 		uurb->buffer_length = totlen;
1436 		break;
1437 
1438 	default:
1439 		return -EINVAL;
1440 	}
1441 
1442 	if (uurb->buffer_length > 0 &&
1443 			!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1444 				uurb->buffer, uurb->buffer_length)) {
1445 		ret = -EFAULT;
1446 		goto error;
1447 	}
1448 	as = alloc_async(number_of_packets);
1449 	if (!as) {
1450 		ret = -ENOMEM;
1451 		goto error;
1452 	}
1453 
1454 	u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1455 	     num_sgs * sizeof(struct scatterlist);
1456 	ret = usbfs_increase_memory_usage(u);
1457 	if (ret)
1458 		goto error;
1459 	as->mem_usage = u;
1460 
1461 	if (num_sgs) {
1462 		as->urb->sg = kmalloc(num_sgs * sizeof(struct scatterlist),
1463 				      GFP_KERNEL);
1464 		if (!as->urb->sg) {
1465 			ret = -ENOMEM;
1466 			goto error;
1467 		}
1468 		as->urb->num_sgs = num_sgs;
1469 		sg_init_table(as->urb->sg, as->urb->num_sgs);
1470 
1471 		totlen = uurb->buffer_length;
1472 		for (i = 0; i < as->urb->num_sgs; i++) {
1473 			u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1474 			buf = kmalloc(u, GFP_KERNEL);
1475 			if (!buf) {
1476 				ret = -ENOMEM;
1477 				goto error;
1478 			}
1479 			sg_set_buf(&as->urb->sg[i], buf, u);
1480 
1481 			if (!is_in) {
1482 				if (copy_from_user(buf, uurb->buffer, u)) {
1483 					ret = -EFAULT;
1484 					goto error;
1485 				}
1486 				uurb->buffer += u;
1487 			}
1488 			totlen -= u;
1489 		}
1490 	} else if (uurb->buffer_length > 0) {
1491 		as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1492 				GFP_KERNEL);
1493 		if (!as->urb->transfer_buffer) {
1494 			ret = -ENOMEM;
1495 			goto error;
1496 		}
1497 
1498 		if (!is_in) {
1499 			if (copy_from_user(as->urb->transfer_buffer,
1500 					   uurb->buffer,
1501 					   uurb->buffer_length)) {
1502 				ret = -EFAULT;
1503 				goto error;
1504 			}
1505 		} else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1506 			/*
1507 			 * Isochronous input data may end up being
1508 			 * discontiguous if some of the packets are short.
1509 			 * Clear the buffer so that the gaps don't leak
1510 			 * kernel data to userspace.
1511 			 */
1512 			memset(as->urb->transfer_buffer, 0,
1513 					uurb->buffer_length);
1514 		}
1515 	}
1516 	as->urb->dev = ps->dev;
1517 	as->urb->pipe = (uurb->type << 30) |
1518 			__create_pipe(ps->dev, uurb->endpoint & 0xf) |
1519 			(uurb->endpoint & USB_DIR_IN);
1520 
1521 	/* This tedious sequence is necessary because the URB_* flags
1522 	 * are internal to the kernel and subject to change, whereas
1523 	 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1524 	 */
1525 	u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1526 	if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1527 		u |= URB_ISO_ASAP;
1528 	if (allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1529 		u |= URB_SHORT_NOT_OK;
1530 	if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1531 		u |= URB_NO_FSBR;
1532 	if (allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1533 		u |= URB_ZERO_PACKET;
1534 	if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1535 		u |= URB_NO_INTERRUPT;
1536 	as->urb->transfer_flags = u;
1537 
1538 	if (!allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1539 		dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_SHORT_NOT_OK.\n");
1540 	if (!allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1541 		dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_ZERO_PACKET.\n");
1542 
1543 	as->urb->transfer_buffer_length = uurb->buffer_length;
1544 	as->urb->setup_packet = (unsigned char *)dr;
1545 	dr = NULL;
1546 	as->urb->start_frame = uurb->start_frame;
1547 	as->urb->number_of_packets = number_of_packets;
1548 	as->urb->stream_id = stream_id;
1549 
1550 	if (ep->desc.bInterval) {
1551 		if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1552 				ps->dev->speed == USB_SPEED_HIGH ||
1553 				ps->dev->speed >= USB_SPEED_SUPER)
1554 			as->urb->interval = 1 <<
1555 					min(15, ep->desc.bInterval - 1);
1556 		else
1557 			as->urb->interval = ep->desc.bInterval;
1558 	}
1559 
1560 	as->urb->context = as;
1561 	as->urb->complete = async_completed;
1562 	for (totlen = u = 0; u < number_of_packets; u++) {
1563 		as->urb->iso_frame_desc[u].offset = totlen;
1564 		as->urb->iso_frame_desc[u].length = isopkt[u].length;
1565 		totlen += isopkt[u].length;
1566 	}
1567 	kfree(isopkt);
1568 	isopkt = NULL;
1569 	as->ps = ps;
1570 	as->userurb = arg;
1571 	if (is_in && uurb->buffer_length > 0)
1572 		as->userbuffer = uurb->buffer;
1573 	else
1574 		as->userbuffer = NULL;
1575 	as->signr = uurb->signr;
1576 	as->ifnum = ifnum;
1577 	as->pid = get_pid(task_pid(current));
1578 	as->cred = get_current_cred();
1579 	security_task_getsecid(current, &as->secid);
1580 	snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1581 			as->urb->transfer_buffer_length, 0, SUBMIT,
1582 			NULL, 0);
1583 	if (!is_in)
1584 		snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1585 
1586 	async_newpending(as);
1587 
1588 	if (usb_endpoint_xfer_bulk(&ep->desc)) {
1589 		spin_lock_irq(&ps->lock);
1590 
1591 		/* Not exactly the endpoint address; the direction bit is
1592 		 * shifted to the 0x10 position so that the value will be
1593 		 * between 0 and 31.
1594 		 */
1595 		as->bulk_addr = usb_endpoint_num(&ep->desc) |
1596 			((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1597 				>> 3);
1598 
1599 		/* If this bulk URB is the start of a new transfer, re-enable
1600 		 * the endpoint.  Otherwise mark it as a continuation URB.
1601 		 */
1602 		if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1603 			as->bulk_status = AS_CONTINUATION;
1604 		else
1605 			ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1606 
1607 		/* Don't accept continuation URBs if the endpoint is
1608 		 * disabled because of an earlier error.
1609 		 */
1610 		if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1611 			ret = -EREMOTEIO;
1612 		else
1613 			ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1614 		spin_unlock_irq(&ps->lock);
1615 	} else {
1616 		ret = usb_submit_urb(as->urb, GFP_KERNEL);
1617 	}
1618 
1619 	if (ret) {
1620 		dev_printk(KERN_DEBUG, &ps->dev->dev,
1621 			   "usbfs: usb_submit_urb returned %d\n", ret);
1622 		snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1623 				0, ret, COMPLETE, NULL, 0);
1624 		async_removepending(as);
1625 		goto error;
1626 	}
1627 	return 0;
1628 
1629  error:
1630 	kfree(isopkt);
1631 	kfree(dr);
1632 	if (as)
1633 		free_async(as);
1634 	return ret;
1635 }
1636 
proc_submiturb(struct usb_dev_state * ps,void __user * arg)1637 static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1638 {
1639 	struct usbdevfs_urb uurb;
1640 
1641 	if (copy_from_user(&uurb, arg, sizeof(uurb)))
1642 		return -EFAULT;
1643 
1644 	return proc_do_submiturb(ps, &uurb,
1645 			(((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1646 			arg);
1647 }
1648 
proc_unlinkurb(struct usb_dev_state * ps,void __user * arg)1649 static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1650 {
1651 	struct urb *urb;
1652 	struct async *as;
1653 	unsigned long flags;
1654 
1655 	spin_lock_irqsave(&ps->lock, flags);
1656 	as = async_getpending(ps, arg);
1657 	if (!as) {
1658 		spin_unlock_irqrestore(&ps->lock, flags);
1659 		return -EINVAL;
1660 	}
1661 
1662 	urb = as->urb;
1663 	usb_get_urb(urb);
1664 	spin_unlock_irqrestore(&ps->lock, flags);
1665 
1666 	usb_kill_urb(urb);
1667 	usb_put_urb(urb);
1668 
1669 	return 0;
1670 }
1671 
compute_isochronous_actual_length(struct urb * urb)1672 static void compute_isochronous_actual_length(struct urb *urb)
1673 {
1674 	unsigned int i;
1675 
1676 	if (urb->number_of_packets > 0) {
1677 		urb->actual_length = 0;
1678 		for (i = 0; i < urb->number_of_packets; i++)
1679 			urb->actual_length +=
1680 					urb->iso_frame_desc[i].actual_length;
1681 	}
1682 }
1683 
processcompl(struct async * as,void __user * __user * arg)1684 static int processcompl(struct async *as, void __user * __user *arg)
1685 {
1686 	struct urb *urb = as->urb;
1687 	struct usbdevfs_urb __user *userurb = as->userurb;
1688 	void __user *addr = as->userurb;
1689 	unsigned int i;
1690 
1691 	compute_isochronous_actual_length(urb);
1692 	if (as->userbuffer && urb->actual_length) {
1693 		if (copy_urb_data_to_user(as->userbuffer, urb))
1694 			goto err_out;
1695 	}
1696 	if (put_user(as->status, &userurb->status))
1697 		goto err_out;
1698 	if (put_user(urb->actual_length, &userurb->actual_length))
1699 		goto err_out;
1700 	if (put_user(urb->error_count, &userurb->error_count))
1701 		goto err_out;
1702 
1703 	if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1704 		for (i = 0; i < urb->number_of_packets; i++) {
1705 			if (put_user(urb->iso_frame_desc[i].actual_length,
1706 				     &userurb->iso_frame_desc[i].actual_length))
1707 				goto err_out;
1708 			if (put_user(urb->iso_frame_desc[i].status,
1709 				     &userurb->iso_frame_desc[i].status))
1710 				goto err_out;
1711 		}
1712 	}
1713 
1714 	if (put_user(addr, (void __user * __user *)arg))
1715 		return -EFAULT;
1716 	return 0;
1717 
1718 err_out:
1719 	return -EFAULT;
1720 }
1721 
reap_as(struct usb_dev_state * ps)1722 static struct async *reap_as(struct usb_dev_state *ps)
1723 {
1724 	DECLARE_WAITQUEUE(wait, current);
1725 	struct async *as = NULL;
1726 	struct usb_device *dev = ps->dev;
1727 
1728 	add_wait_queue(&ps->wait, &wait);
1729 	for (;;) {
1730 		__set_current_state(TASK_INTERRUPTIBLE);
1731 		as = async_getcompleted(ps);
1732 		if (as || !connected(ps))
1733 			break;
1734 		if (signal_pending(current))
1735 			break;
1736 		usb_unlock_device(dev);
1737 		schedule();
1738 		usb_lock_device(dev);
1739 	}
1740 	remove_wait_queue(&ps->wait, &wait);
1741 	set_current_state(TASK_RUNNING);
1742 	return as;
1743 }
1744 
proc_reapurb(struct usb_dev_state * ps,void __user * arg)1745 static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
1746 {
1747 	struct async *as = reap_as(ps);
1748 	if (as) {
1749 		int retval = processcompl(as, (void __user * __user *)arg);
1750 		free_async(as);
1751 		return retval;
1752 	}
1753 	if (signal_pending(current))
1754 		return -EINTR;
1755 	return -ENODEV;
1756 }
1757 
proc_reapurbnonblock(struct usb_dev_state * ps,void __user * arg)1758 static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
1759 {
1760 	int retval;
1761 	struct async *as;
1762 
1763 	as = async_getcompleted(ps);
1764 	if (as) {
1765 		retval = processcompl(as, (void __user * __user *)arg);
1766 		free_async(as);
1767 	} else {
1768 		retval = (connected(ps) ? -EAGAIN : -ENODEV);
1769 	}
1770 	return retval;
1771 }
1772 
1773 #ifdef CONFIG_COMPAT
proc_control_compat(struct usb_dev_state * ps,struct usbdevfs_ctrltransfer32 __user * p32)1774 static int proc_control_compat(struct usb_dev_state *ps,
1775 				struct usbdevfs_ctrltransfer32 __user *p32)
1776 {
1777 	struct usbdevfs_ctrltransfer __user *p;
1778 	__u32 udata;
1779 	p = compat_alloc_user_space(sizeof(*p));
1780 	if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1781 	    get_user(udata, &p32->data) ||
1782 	    put_user(compat_ptr(udata), &p->data))
1783 		return -EFAULT;
1784 	return proc_control(ps, p);
1785 }
1786 
proc_bulk_compat(struct usb_dev_state * ps,struct usbdevfs_bulktransfer32 __user * p32)1787 static int proc_bulk_compat(struct usb_dev_state *ps,
1788 			struct usbdevfs_bulktransfer32 __user *p32)
1789 {
1790 	struct usbdevfs_bulktransfer __user *p;
1791 	compat_uint_t n;
1792 	compat_caddr_t addr;
1793 
1794 	p = compat_alloc_user_space(sizeof(*p));
1795 
1796 	if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1797 	    get_user(n, &p32->len) || put_user(n, &p->len) ||
1798 	    get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1799 	    get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1800 		return -EFAULT;
1801 
1802 	return proc_bulk(ps, p);
1803 }
proc_disconnectsignal_compat(struct usb_dev_state * ps,void __user * arg)1804 static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
1805 {
1806 	struct usbdevfs_disconnectsignal32 ds;
1807 
1808 	if (copy_from_user(&ds, arg, sizeof(ds)))
1809 		return -EFAULT;
1810 	ps->discsignr = ds.signr;
1811 	ps->disccontext = compat_ptr(ds.context);
1812 	return 0;
1813 }
1814 
get_urb32(struct usbdevfs_urb * kurb,struct usbdevfs_urb32 __user * uurb)1815 static int get_urb32(struct usbdevfs_urb *kurb,
1816 		     struct usbdevfs_urb32 __user *uurb)
1817 {
1818 	__u32  uptr;
1819 	if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1820 	    __get_user(kurb->type, &uurb->type) ||
1821 	    __get_user(kurb->endpoint, &uurb->endpoint) ||
1822 	    __get_user(kurb->status, &uurb->status) ||
1823 	    __get_user(kurb->flags, &uurb->flags) ||
1824 	    __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1825 	    __get_user(kurb->actual_length, &uurb->actual_length) ||
1826 	    __get_user(kurb->start_frame, &uurb->start_frame) ||
1827 	    __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1828 	    __get_user(kurb->error_count, &uurb->error_count) ||
1829 	    __get_user(kurb->signr, &uurb->signr))
1830 		return -EFAULT;
1831 
1832 	if (__get_user(uptr, &uurb->buffer))
1833 		return -EFAULT;
1834 	kurb->buffer = compat_ptr(uptr);
1835 	if (__get_user(uptr, &uurb->usercontext))
1836 		return -EFAULT;
1837 	kurb->usercontext = compat_ptr(uptr);
1838 
1839 	return 0;
1840 }
1841 
proc_submiturb_compat(struct usb_dev_state * ps,void __user * arg)1842 static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
1843 {
1844 	struct usbdevfs_urb uurb;
1845 
1846 	if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1847 		return -EFAULT;
1848 
1849 	return proc_do_submiturb(ps, &uurb,
1850 			((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1851 			arg);
1852 }
1853 
processcompl_compat(struct async * as,void __user * __user * arg)1854 static int processcompl_compat(struct async *as, void __user * __user *arg)
1855 {
1856 	struct urb *urb = as->urb;
1857 	struct usbdevfs_urb32 __user *userurb = as->userurb;
1858 	void __user *addr = as->userurb;
1859 	unsigned int i;
1860 
1861 	compute_isochronous_actual_length(urb);
1862 	if (as->userbuffer && urb->actual_length) {
1863 		if (copy_urb_data_to_user(as->userbuffer, urb))
1864 			return -EFAULT;
1865 	}
1866 	if (put_user(as->status, &userurb->status))
1867 		return -EFAULT;
1868 	if (put_user(urb->actual_length, &userurb->actual_length))
1869 		return -EFAULT;
1870 	if (put_user(urb->error_count, &userurb->error_count))
1871 		return -EFAULT;
1872 
1873 	if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1874 		for (i = 0; i < urb->number_of_packets; i++) {
1875 			if (put_user(urb->iso_frame_desc[i].actual_length,
1876 				     &userurb->iso_frame_desc[i].actual_length))
1877 				return -EFAULT;
1878 			if (put_user(urb->iso_frame_desc[i].status,
1879 				     &userurb->iso_frame_desc[i].status))
1880 				return -EFAULT;
1881 		}
1882 	}
1883 
1884 	if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1885 		return -EFAULT;
1886 	return 0;
1887 }
1888 
proc_reapurb_compat(struct usb_dev_state * ps,void __user * arg)1889 static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
1890 {
1891 	struct async *as = reap_as(ps);
1892 	if (as) {
1893 		int retval = processcompl_compat(as, (void __user * __user *)arg);
1894 		free_async(as);
1895 		return retval;
1896 	}
1897 	if (signal_pending(current))
1898 		return -EINTR;
1899 	return -ENODEV;
1900 }
1901 
proc_reapurbnonblock_compat(struct usb_dev_state * ps,void __user * arg)1902 static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
1903 {
1904 	int retval;
1905 	struct async *as;
1906 
1907 	as = async_getcompleted(ps);
1908 	if (as) {
1909 		retval = processcompl_compat(as, (void __user * __user *)arg);
1910 		free_async(as);
1911 	} else {
1912 		retval = (connected(ps) ? -EAGAIN : -ENODEV);
1913 	}
1914 	return retval;
1915 }
1916 
1917 
1918 #endif
1919 
proc_disconnectsignal(struct usb_dev_state * ps,void __user * arg)1920 static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
1921 {
1922 	struct usbdevfs_disconnectsignal ds;
1923 
1924 	if (copy_from_user(&ds, arg, sizeof(ds)))
1925 		return -EFAULT;
1926 	ps->discsignr = ds.signr;
1927 	ps->disccontext = ds.context;
1928 	return 0;
1929 }
1930 
proc_claiminterface(struct usb_dev_state * ps,void __user * arg)1931 static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
1932 {
1933 	unsigned int ifnum;
1934 
1935 	if (get_user(ifnum, (unsigned int __user *)arg))
1936 		return -EFAULT;
1937 	return claimintf(ps, ifnum);
1938 }
1939 
proc_releaseinterface(struct usb_dev_state * ps,void __user * arg)1940 static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
1941 {
1942 	unsigned int ifnum;
1943 	int ret;
1944 
1945 	if (get_user(ifnum, (unsigned int __user *)arg))
1946 		return -EFAULT;
1947 	ret = releaseintf(ps, ifnum);
1948 	if (ret < 0)
1949 		return ret;
1950 	destroy_async_on_interface (ps, ifnum);
1951 	return 0;
1952 }
1953 
proc_ioctl(struct usb_dev_state * ps,struct usbdevfs_ioctl * ctl)1954 static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
1955 {
1956 	int			size;
1957 	void			*buf = NULL;
1958 	int			retval = 0;
1959 	struct usb_interface    *intf = NULL;
1960 	struct usb_driver       *driver = NULL;
1961 
1962 	/* alloc buffer */
1963 	size = _IOC_SIZE(ctl->ioctl_code);
1964 	if (size > 0) {
1965 		buf = kmalloc(size, GFP_KERNEL);
1966 		if (buf == NULL)
1967 			return -ENOMEM;
1968 		if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1969 			if (copy_from_user(buf, ctl->data, size)) {
1970 				kfree(buf);
1971 				return -EFAULT;
1972 			}
1973 		} else {
1974 			memset(buf, 0, size);
1975 		}
1976 	}
1977 
1978 	if (!connected(ps)) {
1979 		kfree(buf);
1980 		return -ENODEV;
1981 	}
1982 
1983 	if (ps->dev->state != USB_STATE_CONFIGURED)
1984 		retval = -EHOSTUNREACH;
1985 	else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1986 		retval = -EINVAL;
1987 	else switch (ctl->ioctl_code) {
1988 
1989 	/* disconnect kernel driver from interface */
1990 	case USBDEVFS_DISCONNECT:
1991 		if (intf->dev.driver) {
1992 			driver = to_usb_driver(intf->dev.driver);
1993 			dev_dbg(&intf->dev, "disconnect by usbfs\n");
1994 			usb_driver_release_interface(driver, intf);
1995 		} else
1996 			retval = -ENODATA;
1997 		break;
1998 
1999 	/* let kernel drivers try to (re)bind to the interface */
2000 	case USBDEVFS_CONNECT:
2001 		if (!intf->dev.driver)
2002 			retval = device_attach(&intf->dev);
2003 		else
2004 			retval = -EBUSY;
2005 		break;
2006 
2007 	/* talk directly to the interface's driver */
2008 	default:
2009 		if (intf->dev.driver)
2010 			driver = to_usb_driver(intf->dev.driver);
2011 		if (driver == NULL || driver->unlocked_ioctl == NULL) {
2012 			retval = -ENOTTY;
2013 		} else {
2014 			retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2015 			if (retval == -ENOIOCTLCMD)
2016 				retval = -ENOTTY;
2017 		}
2018 	}
2019 
2020 	/* cleanup and return */
2021 	if (retval >= 0
2022 			&& (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2023 			&& size > 0
2024 			&& copy_to_user(ctl->data, buf, size) != 0)
2025 		retval = -EFAULT;
2026 
2027 	kfree(buf);
2028 	return retval;
2029 }
2030 
proc_ioctl_default(struct usb_dev_state * ps,void __user * arg)2031 static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2032 {
2033 	struct usbdevfs_ioctl	ctrl;
2034 
2035 	if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2036 		return -EFAULT;
2037 	return proc_ioctl(ps, &ctrl);
2038 }
2039 
2040 #ifdef CONFIG_COMPAT
proc_ioctl_compat(struct usb_dev_state * ps,compat_uptr_t arg)2041 static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2042 {
2043 	struct usbdevfs_ioctl32 __user *uioc;
2044 	struct usbdevfs_ioctl ctrl;
2045 	u32 udata;
2046 
2047 	uioc = compat_ptr((long)arg);
2048 	if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
2049 	    __get_user(ctrl.ifno, &uioc->ifno) ||
2050 	    __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
2051 	    __get_user(udata, &uioc->data))
2052 		return -EFAULT;
2053 	ctrl.data = compat_ptr(udata);
2054 
2055 	return proc_ioctl(ps, &ctrl);
2056 }
2057 #endif
2058 
proc_claim_port(struct usb_dev_state * ps,void __user * arg)2059 static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2060 {
2061 	unsigned portnum;
2062 	int rc;
2063 
2064 	if (get_user(portnum, (unsigned __user *) arg))
2065 		return -EFAULT;
2066 	rc = usb_hub_claim_port(ps->dev, portnum, ps);
2067 	if (rc == 0)
2068 		snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2069 			portnum, task_pid_nr(current), current->comm);
2070 	return rc;
2071 }
2072 
proc_release_port(struct usb_dev_state * ps,void __user * arg)2073 static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2074 {
2075 	unsigned portnum;
2076 
2077 	if (get_user(portnum, (unsigned __user *) arg))
2078 		return -EFAULT;
2079 	return usb_hub_release_port(ps->dev, portnum, ps);
2080 }
2081 
proc_get_capabilities(struct usb_dev_state * ps,void __user * arg)2082 static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2083 {
2084 	__u32 caps;
2085 
2086 	caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2087 			USBDEVFS_CAP_REAP_AFTER_DISCONNECT;
2088 	if (!ps->dev->bus->no_stop_on_short)
2089 		caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2090 	if (ps->dev->bus->sg_tablesize)
2091 		caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2092 
2093 	if (put_user(caps, (__u32 __user *)arg))
2094 		return -EFAULT;
2095 
2096 	return 0;
2097 }
2098 
proc_disconnect_claim(struct usb_dev_state * ps,void __user * arg)2099 static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2100 {
2101 	struct usbdevfs_disconnect_claim dc;
2102 	struct usb_interface *intf;
2103 
2104 	if (copy_from_user(&dc, arg, sizeof(dc)))
2105 		return -EFAULT;
2106 
2107 	intf = usb_ifnum_to_if(ps->dev, dc.interface);
2108 	if (!intf)
2109 		return -EINVAL;
2110 
2111 	if (intf->dev.driver) {
2112 		struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2113 
2114 		if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2115 				strncmp(dc.driver, intf->dev.driver->name,
2116 					sizeof(dc.driver)) != 0)
2117 			return -EBUSY;
2118 
2119 		if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2120 				strncmp(dc.driver, intf->dev.driver->name,
2121 					sizeof(dc.driver)) == 0)
2122 			return -EBUSY;
2123 
2124 		dev_dbg(&intf->dev, "disconnect by usbfs\n");
2125 		usb_driver_release_interface(driver, intf);
2126 	}
2127 
2128 	return claimintf(ps, dc.interface);
2129 }
2130 
proc_alloc_streams(struct usb_dev_state * ps,void __user * arg)2131 static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2132 {
2133 	unsigned num_streams, num_eps;
2134 	struct usb_host_endpoint **eps;
2135 	struct usb_interface *intf;
2136 	int r;
2137 
2138 	r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2139 				   &eps, &intf);
2140 	if (r)
2141 		return r;
2142 
2143 	destroy_async_on_interface(ps,
2144 				   intf->altsetting[0].desc.bInterfaceNumber);
2145 
2146 	r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2147 	kfree(eps);
2148 	return r;
2149 }
2150 
proc_free_streams(struct usb_dev_state * ps,void __user * arg)2151 static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2152 {
2153 	unsigned num_eps;
2154 	struct usb_host_endpoint **eps;
2155 	struct usb_interface *intf;
2156 	int r;
2157 
2158 	r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2159 	if (r)
2160 		return r;
2161 
2162 	destroy_async_on_interface(ps,
2163 				   intf->altsetting[0].desc.bInterfaceNumber);
2164 
2165 	r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2166 	kfree(eps);
2167 	return r;
2168 }
2169 
2170 /*
2171  * NOTE:  All requests here that have interface numbers as parameters
2172  * are assuming that somehow the configuration has been prevented from
2173  * changing.  But there's no mechanism to ensure that...
2174  */
usbdev_do_ioctl(struct file * file,unsigned int cmd,void __user * p)2175 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2176 				void __user *p)
2177 {
2178 	struct usb_dev_state *ps = file->private_data;
2179 	struct inode *inode = file_inode(file);
2180 	struct usb_device *dev = ps->dev;
2181 	int ret = -ENOTTY;
2182 
2183 	if (!(file->f_mode & FMODE_WRITE))
2184 		return -EPERM;
2185 
2186 	usb_lock_device(dev);
2187 
2188 	/* Reap operations are allowed even after disconnection */
2189 	switch (cmd) {
2190 	case USBDEVFS_REAPURB:
2191 		snoop(&dev->dev, "%s: REAPURB\n", __func__);
2192 		ret = proc_reapurb(ps, p);
2193 		goto done;
2194 
2195 	case USBDEVFS_REAPURBNDELAY:
2196 		snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2197 		ret = proc_reapurbnonblock(ps, p);
2198 		goto done;
2199 
2200 #ifdef CONFIG_COMPAT
2201 	case USBDEVFS_REAPURB32:
2202 		snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2203 		ret = proc_reapurb_compat(ps, p);
2204 		goto done;
2205 
2206 	case USBDEVFS_REAPURBNDELAY32:
2207 		snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2208 		ret = proc_reapurbnonblock_compat(ps, p);
2209 		goto done;
2210 #endif
2211 	}
2212 
2213 	if (!connected(ps)) {
2214 		usb_unlock_device(dev);
2215 		return -ENODEV;
2216 	}
2217 
2218 	switch (cmd) {
2219 	case USBDEVFS_CONTROL:
2220 		snoop(&dev->dev, "%s: CONTROL\n", __func__);
2221 		ret = proc_control(ps, p);
2222 		if (ret >= 0)
2223 			inode->i_mtime = CURRENT_TIME;
2224 		break;
2225 
2226 	case USBDEVFS_BULK:
2227 		snoop(&dev->dev, "%s: BULK\n", __func__);
2228 		ret = proc_bulk(ps, p);
2229 		if (ret >= 0)
2230 			inode->i_mtime = CURRENT_TIME;
2231 		break;
2232 
2233 	case USBDEVFS_RESETEP:
2234 		snoop(&dev->dev, "%s: RESETEP\n", __func__);
2235 		ret = proc_resetep(ps, p);
2236 		if (ret >= 0)
2237 			inode->i_mtime = CURRENT_TIME;
2238 		break;
2239 
2240 	case USBDEVFS_RESET:
2241 		snoop(&dev->dev, "%s: RESET\n", __func__);
2242 		ret = proc_resetdevice(ps);
2243 		break;
2244 
2245 	case USBDEVFS_CLEAR_HALT:
2246 		snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2247 		ret = proc_clearhalt(ps, p);
2248 		if (ret >= 0)
2249 			inode->i_mtime = CURRENT_TIME;
2250 		break;
2251 
2252 	case USBDEVFS_GETDRIVER:
2253 		snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2254 		ret = proc_getdriver(ps, p);
2255 		break;
2256 
2257 	case USBDEVFS_CONNECTINFO:
2258 		snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2259 		ret = proc_connectinfo(ps, p);
2260 		break;
2261 
2262 	case USBDEVFS_SETINTERFACE:
2263 		snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2264 		ret = proc_setintf(ps, p);
2265 		break;
2266 
2267 	case USBDEVFS_SETCONFIGURATION:
2268 		snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2269 		ret = proc_setconfig(ps, p);
2270 		break;
2271 
2272 	case USBDEVFS_SUBMITURB:
2273 		snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2274 		ret = proc_submiturb(ps, p);
2275 		if (ret >= 0)
2276 			inode->i_mtime = CURRENT_TIME;
2277 		break;
2278 
2279 #ifdef CONFIG_COMPAT
2280 	case USBDEVFS_CONTROL32:
2281 		snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2282 		ret = proc_control_compat(ps, p);
2283 		if (ret >= 0)
2284 			inode->i_mtime = CURRENT_TIME;
2285 		break;
2286 
2287 	case USBDEVFS_BULK32:
2288 		snoop(&dev->dev, "%s: BULK32\n", __func__);
2289 		ret = proc_bulk_compat(ps, p);
2290 		if (ret >= 0)
2291 			inode->i_mtime = CURRENT_TIME;
2292 		break;
2293 
2294 	case USBDEVFS_DISCSIGNAL32:
2295 		snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2296 		ret = proc_disconnectsignal_compat(ps, p);
2297 		break;
2298 
2299 	case USBDEVFS_SUBMITURB32:
2300 		snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2301 		ret = proc_submiturb_compat(ps, p);
2302 		if (ret >= 0)
2303 			inode->i_mtime = CURRENT_TIME;
2304 		break;
2305 
2306 	case USBDEVFS_IOCTL32:
2307 		snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2308 		ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2309 		break;
2310 #endif
2311 
2312 	case USBDEVFS_DISCARDURB:
2313 		snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
2314 		ret = proc_unlinkurb(ps, p);
2315 		break;
2316 
2317 	case USBDEVFS_DISCSIGNAL:
2318 		snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2319 		ret = proc_disconnectsignal(ps, p);
2320 		break;
2321 
2322 	case USBDEVFS_CLAIMINTERFACE:
2323 		snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2324 		ret = proc_claiminterface(ps, p);
2325 		break;
2326 
2327 	case USBDEVFS_RELEASEINTERFACE:
2328 		snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2329 		ret = proc_releaseinterface(ps, p);
2330 		break;
2331 
2332 	case USBDEVFS_IOCTL:
2333 		snoop(&dev->dev, "%s: IOCTL\n", __func__);
2334 		ret = proc_ioctl_default(ps, p);
2335 		break;
2336 
2337 	case USBDEVFS_CLAIM_PORT:
2338 		snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2339 		ret = proc_claim_port(ps, p);
2340 		break;
2341 
2342 	case USBDEVFS_RELEASE_PORT:
2343 		snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2344 		ret = proc_release_port(ps, p);
2345 		break;
2346 	case USBDEVFS_GET_CAPABILITIES:
2347 		ret = proc_get_capabilities(ps, p);
2348 		break;
2349 	case USBDEVFS_DISCONNECT_CLAIM:
2350 		ret = proc_disconnect_claim(ps, p);
2351 		break;
2352 	case USBDEVFS_ALLOC_STREAMS:
2353 		ret = proc_alloc_streams(ps, p);
2354 		break;
2355 	case USBDEVFS_FREE_STREAMS:
2356 		ret = proc_free_streams(ps, p);
2357 		break;
2358 	}
2359 
2360  done:
2361 	usb_unlock_device(dev);
2362 	if (ret >= 0)
2363 		inode->i_atime = CURRENT_TIME;
2364 	return ret;
2365 }
2366 
usbdev_ioctl(struct file * file,unsigned int cmd,unsigned long arg)2367 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2368 			unsigned long arg)
2369 {
2370 	int ret;
2371 
2372 	ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2373 
2374 	return ret;
2375 }
2376 
2377 #ifdef CONFIG_COMPAT
usbdev_compat_ioctl(struct file * file,unsigned int cmd,unsigned long arg)2378 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2379 			unsigned long arg)
2380 {
2381 	int ret;
2382 
2383 	ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2384 
2385 	return ret;
2386 }
2387 #endif
2388 
2389 /* No kernel lock - fine */
usbdev_poll(struct file * file,struct poll_table_struct * wait)2390 static unsigned int usbdev_poll(struct file *file,
2391 				struct poll_table_struct *wait)
2392 {
2393 	struct usb_dev_state *ps = file->private_data;
2394 	unsigned int mask = 0;
2395 
2396 	poll_wait(file, &ps->wait, wait);
2397 	if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2398 		mask |= POLLOUT | POLLWRNORM;
2399 	if (!connected(ps))
2400 		mask |= POLLERR | POLLHUP;
2401 	return mask;
2402 }
2403 
2404 const struct file_operations usbdev_file_operations = {
2405 	.owner =	  THIS_MODULE,
2406 	.llseek =	  usbdev_lseek,
2407 	.read =		  usbdev_read,
2408 	.poll =		  usbdev_poll,
2409 	.unlocked_ioctl = usbdev_ioctl,
2410 #ifdef CONFIG_COMPAT
2411 	.compat_ioctl =   usbdev_compat_ioctl,
2412 #endif
2413 	.open =		  usbdev_open,
2414 	.release =	  usbdev_release,
2415 };
2416 
usbdev_remove(struct usb_device * udev)2417 static void usbdev_remove(struct usb_device *udev)
2418 {
2419 	struct usb_dev_state *ps;
2420 	struct siginfo sinfo;
2421 
2422 	while (!list_empty(&udev->filelist)) {
2423 		ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2424 		destroy_all_async(ps);
2425 		wake_up_all(&ps->wait);
2426 		list_del_init(&ps->list);
2427 		if (ps->discsignr) {
2428 			memset(&sinfo, 0, sizeof(sinfo));
2429 			sinfo.si_signo = ps->discsignr;
2430 			sinfo.si_errno = EPIPE;
2431 			sinfo.si_code = SI_ASYNCIO;
2432 			sinfo.si_addr = ps->disccontext;
2433 			kill_pid_info_as_cred(ps->discsignr, &sinfo,
2434 					ps->disc_pid, ps->cred, ps->secid);
2435 		}
2436 	}
2437 }
2438 
usbdev_notify(struct notifier_block * self,unsigned long action,void * dev)2439 static int usbdev_notify(struct notifier_block *self,
2440 			       unsigned long action, void *dev)
2441 {
2442 	switch (action) {
2443 	case USB_DEVICE_ADD:
2444 		break;
2445 	case USB_DEVICE_REMOVE:
2446 		usbdev_remove(dev);
2447 		break;
2448 	}
2449 	return NOTIFY_OK;
2450 }
2451 
2452 static struct notifier_block usbdev_nb = {
2453 	.notifier_call =	usbdev_notify,
2454 };
2455 
2456 static struct cdev usb_device_cdev;
2457 
usb_devio_init(void)2458 int __init usb_devio_init(void)
2459 {
2460 	int retval;
2461 
2462 	retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2463 					"usb_device");
2464 	if (retval) {
2465 		printk(KERN_ERR "Unable to register minors for usb_device\n");
2466 		goto out;
2467 	}
2468 	cdev_init(&usb_device_cdev, &usbdev_file_operations);
2469 	retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2470 	if (retval) {
2471 		printk(KERN_ERR "Unable to get usb_device major %d\n",
2472 		       USB_DEVICE_MAJOR);
2473 		goto error_cdev;
2474 	}
2475 	usb_register_notify(&usbdev_nb);
2476 out:
2477 	return retval;
2478 
2479 error_cdev:
2480 	unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2481 	goto out;
2482 }
2483 
usb_devio_cleanup(void)2484 void usb_devio_cleanup(void)
2485 {
2486 	usb_unregister_notify(&usbdev_nb);
2487 	cdev_del(&usb_device_cdev);
2488 	unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2489 }
2490