1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Changes:
4  * Arnaldo Carvalho de Melo <acme@conectiva.com.br> 08/23/2000
5  * - get rid of some verify_areas and use __copy*user and __get/put_user
6  *   for the ones that remain
7  */
8 #include <linux/module.h>
9 #include <linux/blkdev.h>
10 #include <linux/interrupt.h>
11 #include <linux/errno.h>
12 #include <linux/kernel.h>
13 #include <linux/sched.h>
14 #include <linux/mm.h>
15 #include <linux/string.h>
16 #include <linux/uaccess.h>
17 #include <linux/cdrom.h>
18 
19 #include <scsi/scsi.h>
20 #include <scsi/scsi_cmnd.h>
21 #include <scsi/scsi_device.h>
22 #include <scsi/scsi_eh.h>
23 #include <scsi/scsi_host.h>
24 #include <scsi/scsi_ioctl.h>
25 #include <scsi/sg.h>
26 #include <scsi/scsi_dbg.h>
27 
28 #include "scsi_logging.h"
29 
30 #define NORMAL_RETRIES			5
31 #define IOCTL_NORMAL_TIMEOUT			(10 * HZ)
32 
33 #define MAX_BUF PAGE_SIZE
34 
35 /**
36  * ioctl_probe  --  return host identification
37  * @host:	host to identify
38  * @buffer:	userspace buffer for identification
39  *
40  * Return an identifying string at @buffer, if @buffer is non-NULL, filling
41  * to the length stored at * (int *) @buffer.
42  */
ioctl_probe(struct Scsi_Host * host,void __user * buffer)43 static int ioctl_probe(struct Scsi_Host *host, void __user *buffer)
44 {
45 	unsigned int len, slen;
46 	const char *string;
47 
48 	if (buffer) {
49 		if (get_user(len, (unsigned int __user *) buffer))
50 			return -EFAULT;
51 
52 		if (host->hostt->info)
53 			string = host->hostt->info(host);
54 		else
55 			string = host->hostt->name;
56 		if (string) {
57 			slen = strlen(string);
58 			if (len > slen)
59 				len = slen + 1;
60 			if (copy_to_user(buffer, string, len))
61 				return -EFAULT;
62 		}
63 	}
64 	return 1;
65 }
66 
ioctl_internal_command(struct scsi_device * sdev,char * cmd,int timeout,int retries)67 static int ioctl_internal_command(struct scsi_device *sdev, char *cmd,
68 				  int timeout, int retries)
69 {
70 	int result;
71 	struct scsi_sense_hdr sshdr;
72 
73 	SCSI_LOG_IOCTL(1, sdev_printk(KERN_INFO, sdev,
74 				      "Trying ioctl with scsi command %d\n", *cmd));
75 
76 	result = scsi_execute_req(sdev, cmd, DMA_NONE, NULL, 0,
77 				  &sshdr, timeout, retries, NULL);
78 
79 	SCSI_LOG_IOCTL(2, sdev_printk(KERN_INFO, sdev,
80 				      "Ioctl returned  0x%x\n", result));
81 
82 	if (result < 0)
83 		goto out;
84 	if (scsi_sense_valid(&sshdr)) {
85 		switch (sshdr.sense_key) {
86 		case ILLEGAL_REQUEST:
87 			if (cmd[0] == ALLOW_MEDIUM_REMOVAL)
88 				sdev->lockable = 0;
89 			else
90 				sdev_printk(KERN_INFO, sdev,
91 					    "ioctl_internal_command: "
92 					    "ILLEGAL REQUEST "
93 					    "asc=0x%x ascq=0x%x\n",
94 					    sshdr.asc, sshdr.ascq);
95 			break;
96 		case NOT_READY:	/* This happens if there is no disc in drive */
97 			if (sdev->removable)
98 				break;
99 			fallthrough;
100 		case UNIT_ATTENTION:
101 			if (sdev->removable) {
102 				sdev->changed = 1;
103 				result = 0;	/* This is no longer considered an error */
104 				break;
105 			}
106 			fallthrough;	/* for non-removable media */
107 		default:
108 			sdev_printk(KERN_INFO, sdev,
109 				    "ioctl_internal_command return code = %x\n",
110 				    result);
111 			scsi_print_sense_hdr(sdev, NULL, &sshdr);
112 			break;
113 		}
114 	}
115 out:
116 	SCSI_LOG_IOCTL(2, sdev_printk(KERN_INFO, sdev,
117 				      "IOCTL Releasing command\n"));
118 	return result;
119 }
120 
scsi_set_medium_removal(struct scsi_device * sdev,char state)121 int scsi_set_medium_removal(struct scsi_device *sdev, char state)
122 {
123 	char scsi_cmd[MAX_COMMAND_SIZE];
124 	int ret;
125 
126 	if (!sdev->removable || !sdev->lockable)
127 	       return 0;
128 
129 	scsi_cmd[0] = ALLOW_MEDIUM_REMOVAL;
130 	scsi_cmd[1] = 0;
131 	scsi_cmd[2] = 0;
132 	scsi_cmd[3] = 0;
133 	scsi_cmd[4] = state;
134 	scsi_cmd[5] = 0;
135 
136 	ret = ioctl_internal_command(sdev, scsi_cmd,
137 			IOCTL_NORMAL_TIMEOUT, NORMAL_RETRIES);
138 	if (ret == 0)
139 		sdev->locked = (state == SCSI_REMOVAL_PREVENT);
140 	return ret;
141 }
142 EXPORT_SYMBOL(scsi_set_medium_removal);
143 
144 /*
145  * The scsi_ioctl_get_pci() function places into arg the value
146  * pci_dev::slot_name (8 characters) for the PCI device (if any).
147  * Returns: 0 on success
148  *          -ENXIO if there isn't a PCI device pointer
149  *                 (could be because the SCSI driver hasn't been
150  *                  updated yet, or because it isn't a SCSI
151  *                  device)
152  *          any copy_to_user() error on failure there
153  */
scsi_ioctl_get_pci(struct scsi_device * sdev,void __user * arg)154 static int scsi_ioctl_get_pci(struct scsi_device *sdev, void __user *arg)
155 {
156 	struct device *dev = scsi_get_device(sdev->host);
157 	const char *name;
158 
159         if (!dev)
160 		return -ENXIO;
161 
162 	name = dev_name(dev);
163 
164 	/* compatibility with old ioctl which only returned
165 	 * 20 characters */
166         return copy_to_user(arg, name, min(strlen(name), (size_t)20))
167 		? -EFAULT: 0;
168 }
169 
sg_get_version(int __user * p)170 static int sg_get_version(int __user *p)
171 {
172 	static const int sg_version_num = 30527;
173 	return put_user(sg_version_num, p);
174 }
175 
sg_set_timeout(struct scsi_device * sdev,int __user * p)176 static int sg_set_timeout(struct scsi_device *sdev, int __user *p)
177 {
178 	int timeout, err = get_user(timeout, p);
179 
180 	if (!err)
181 		sdev->sg_timeout = clock_t_to_jiffies(timeout);
182 
183 	return err;
184 }
185 
sg_get_reserved_size(struct scsi_device * sdev,int __user * p)186 static int sg_get_reserved_size(struct scsi_device *sdev, int __user *p)
187 {
188 	int val = min(sdev->sg_reserved_size,
189 		      queue_max_bytes(sdev->request_queue));
190 
191 	return put_user(val, p);
192 }
193 
sg_set_reserved_size(struct scsi_device * sdev,int __user * p)194 static int sg_set_reserved_size(struct scsi_device *sdev, int __user *p)
195 {
196 	int size, err = get_user(size, p);
197 
198 	if (err)
199 		return err;
200 
201 	if (size < 0)
202 		return -EINVAL;
203 
204 	sdev->sg_reserved_size = min_t(unsigned int, size,
205 				       queue_max_bytes(sdev->request_queue));
206 	return 0;
207 }
208 
209 /*
210  * will always return that we are ATAPI even for a real SCSI drive, I'm not
211  * so sure this is worth doing anything about (why would you care??)
212  */
sg_emulated_host(struct request_queue * q,int __user * p)213 static int sg_emulated_host(struct request_queue *q, int __user *p)
214 {
215 	return put_user(1, p);
216 }
217 
scsi_get_idlun(struct scsi_device * sdev,void __user * argp)218 static int scsi_get_idlun(struct scsi_device *sdev, void __user *argp)
219 {
220 	struct scsi_idlun v = {
221 		.dev_id = (sdev->id & 0xff) +
222 			((sdev->lun & 0xff) << 8) +
223 			((sdev->channel & 0xff) << 16) +
224 			((sdev->host->host_no & 0xff) << 24),
225 		.host_unique_id = sdev->host->unique_id
226 	};
227 	if (copy_to_user(argp, &v, sizeof(struct scsi_idlun)))
228 		return -EFAULT;
229 	return 0;
230 }
231 
scsi_send_start_stop(struct scsi_device * sdev,int data)232 static int scsi_send_start_stop(struct scsi_device *sdev, int data)
233 {
234 	u8 cdb[MAX_COMMAND_SIZE] = { };
235 
236 	cdb[0] = START_STOP;
237 	cdb[4] = data;
238 	return ioctl_internal_command(sdev, cdb, START_STOP_TIMEOUT,
239 				      NORMAL_RETRIES);
240 }
241 
242 /*
243  * Check if the given command is allowed.
244  *
245  * Only a subset of commands are allowed for unprivileged users. Commands used
246  * to format the media, update the firmware, etc. are not permitted.
247  */
scsi_cmd_allowed(unsigned char * cmd,fmode_t mode)248 bool scsi_cmd_allowed(unsigned char *cmd, fmode_t mode)
249 {
250 	/* root can do any command. */
251 	if (capable(CAP_SYS_RAWIO))
252 		return true;
253 
254 	/* Anybody who can open the device can do a read-safe command */
255 	switch (cmd[0]) {
256 	/* Basic read-only commands */
257 	case TEST_UNIT_READY:
258 	case REQUEST_SENSE:
259 	case READ_6:
260 	case READ_10:
261 	case READ_12:
262 	case READ_16:
263 	case READ_BUFFER:
264 	case READ_DEFECT_DATA:
265 	case READ_CAPACITY: /* also GPCMD_READ_CDVD_CAPACITY */
266 	case READ_LONG:
267 	case INQUIRY:
268 	case MODE_SENSE:
269 	case MODE_SENSE_10:
270 	case LOG_SENSE:
271 	case START_STOP:
272 	case GPCMD_VERIFY_10:
273 	case VERIFY_16:
274 	case REPORT_LUNS:
275 	case SERVICE_ACTION_IN_16:
276 	case RECEIVE_DIAGNOSTIC:
277 	case MAINTENANCE_IN: /* also GPCMD_SEND_KEY, which is a write command */
278 	case GPCMD_READ_BUFFER_CAPACITY:
279 	/* Audio CD commands */
280 	case GPCMD_PLAY_CD:
281 	case GPCMD_PLAY_AUDIO_10:
282 	case GPCMD_PLAY_AUDIO_MSF:
283 	case GPCMD_PLAY_AUDIO_TI:
284 	case GPCMD_PAUSE_RESUME:
285 	/* CD/DVD data reading */
286 	case GPCMD_READ_CD:
287 	case GPCMD_READ_CD_MSF:
288 	case GPCMD_READ_DISC_INFO:
289 	case GPCMD_READ_DVD_STRUCTURE:
290 	case GPCMD_READ_HEADER:
291 	case GPCMD_READ_TRACK_RZONE_INFO:
292 	case GPCMD_READ_SUBCHANNEL:
293 	case GPCMD_READ_TOC_PMA_ATIP:
294 	case GPCMD_REPORT_KEY:
295 	case GPCMD_SCAN:
296 	case GPCMD_GET_CONFIGURATION:
297 	case GPCMD_READ_FORMAT_CAPACITIES:
298 	case GPCMD_GET_EVENT_STATUS_NOTIFICATION:
299 	case GPCMD_GET_PERFORMANCE:
300 	case GPCMD_SEEK:
301 	case GPCMD_STOP_PLAY_SCAN:
302 	/* ZBC */
303 	case ZBC_IN:
304 		return true;
305 	/* Basic writing commands */
306 	case WRITE_6:
307 	case WRITE_10:
308 	case WRITE_VERIFY:
309 	case WRITE_12:
310 	case WRITE_VERIFY_12:
311 	case WRITE_16:
312 	case WRITE_LONG:
313 	case WRITE_LONG_2:
314 	case WRITE_SAME:
315 	case WRITE_SAME_16:
316 	case WRITE_SAME_32:
317 	case ERASE:
318 	case GPCMD_MODE_SELECT_10:
319 	case MODE_SELECT:
320 	case LOG_SELECT:
321 	case GPCMD_BLANK:
322 	case GPCMD_CLOSE_TRACK:
323 	case GPCMD_FLUSH_CACHE:
324 	case GPCMD_FORMAT_UNIT:
325 	case GPCMD_REPAIR_RZONE_TRACK:
326 	case GPCMD_RESERVE_RZONE_TRACK:
327 	case GPCMD_SEND_DVD_STRUCTURE:
328 	case GPCMD_SEND_EVENT:
329 	case GPCMD_SEND_OPC:
330 	case GPCMD_SEND_CUE_SHEET:
331 	case GPCMD_SET_SPEED:
332 	case GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL:
333 	case GPCMD_LOAD_UNLOAD:
334 	case GPCMD_SET_STREAMING:
335 	case GPCMD_SET_READ_AHEAD:
336 	/* ZBC */
337 	case ZBC_OUT:
338 		return (mode & FMODE_WRITE);
339 	default:
340 		return false;
341 	}
342 }
343 EXPORT_SYMBOL(scsi_cmd_allowed);
344 
scsi_fill_sghdr_rq(struct scsi_device * sdev,struct request * rq,struct sg_io_hdr * hdr,fmode_t mode)345 static int scsi_fill_sghdr_rq(struct scsi_device *sdev, struct request *rq,
346 		struct sg_io_hdr *hdr, fmode_t mode)
347 {
348 	struct scsi_cmnd *scmd = blk_mq_rq_to_pdu(rq);
349 
350 	if (hdr->cmd_len < 6)
351 		return -EMSGSIZE;
352 	if (copy_from_user(scmd->cmnd, hdr->cmdp, hdr->cmd_len))
353 		return -EFAULT;
354 	if (!scsi_cmd_allowed(scmd->cmnd, mode))
355 		return -EPERM;
356 	scmd->cmd_len = hdr->cmd_len;
357 
358 	rq->timeout = msecs_to_jiffies(hdr->timeout);
359 	if (!rq->timeout)
360 		rq->timeout = sdev->sg_timeout;
361 	if (!rq->timeout)
362 		rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
363 	if (rq->timeout < BLK_MIN_SG_TIMEOUT)
364 		rq->timeout = BLK_MIN_SG_TIMEOUT;
365 
366 	return 0;
367 }
368 
scsi_complete_sghdr_rq(struct request * rq,struct sg_io_hdr * hdr,struct bio * bio)369 static int scsi_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
370 		struct bio *bio)
371 {
372 	struct scsi_cmnd *scmd = blk_mq_rq_to_pdu(rq);
373 	int r, ret = 0;
374 
375 	/*
376 	 * fill in all the output members
377 	 */
378 	hdr->status = scmd->result & 0xff;
379 	hdr->masked_status = status_byte(scmd->result);
380 	hdr->msg_status = COMMAND_COMPLETE;
381 	hdr->host_status = host_byte(scmd->result);
382 	hdr->driver_status = 0;
383 	if (scsi_status_is_check_condition(hdr->status))
384 		hdr->driver_status = DRIVER_SENSE;
385 	hdr->info = 0;
386 	if (hdr->masked_status || hdr->host_status || hdr->driver_status)
387 		hdr->info |= SG_INFO_CHECK;
388 	hdr->resid = scmd->resid_len;
389 	hdr->sb_len_wr = 0;
390 
391 	if (scmd->sense_len && hdr->sbp) {
392 		int len = min((unsigned int) hdr->mx_sb_len, scmd->sense_len);
393 
394 		if (!copy_to_user(hdr->sbp, scmd->sense_buffer, len))
395 			hdr->sb_len_wr = len;
396 		else
397 			ret = -EFAULT;
398 	}
399 
400 	r = blk_rq_unmap_user(bio);
401 	if (!ret)
402 		ret = r;
403 
404 	return ret;
405 }
406 
sg_io(struct scsi_device * sdev,struct sg_io_hdr * hdr,fmode_t mode)407 static int sg_io(struct scsi_device *sdev, struct sg_io_hdr *hdr, fmode_t mode)
408 {
409 	unsigned long start_time;
410 	ssize_t ret = 0;
411 	int writing = 0;
412 	int at_head = 0;
413 	struct request *rq;
414 	struct scsi_cmnd *scmd;
415 	struct bio *bio;
416 
417 	if (hdr->interface_id != 'S')
418 		return -EINVAL;
419 
420 	if (hdr->dxfer_len > (queue_max_hw_sectors(sdev->request_queue) << 9))
421 		return -EIO;
422 
423 	if (hdr->dxfer_len)
424 		switch (hdr->dxfer_direction) {
425 		default:
426 			return -EINVAL;
427 		case SG_DXFER_TO_DEV:
428 			writing = 1;
429 			break;
430 		case SG_DXFER_TO_FROM_DEV:
431 		case SG_DXFER_FROM_DEV:
432 			break;
433 		}
434 	if (hdr->flags & SG_FLAG_Q_AT_HEAD)
435 		at_head = 1;
436 
437 	rq = scsi_alloc_request(sdev->request_queue, writing ?
438 			     REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
439 	if (IS_ERR(rq))
440 		return PTR_ERR(rq);
441 	scmd = blk_mq_rq_to_pdu(rq);
442 
443 	if (hdr->cmd_len > sizeof(scmd->cmnd)) {
444 		ret = -EINVAL;
445 		goto out_put_request;
446 	}
447 
448 	ret = scsi_fill_sghdr_rq(sdev, rq, hdr, mode);
449 	if (ret < 0)
450 		goto out_put_request;
451 
452 	ret = 0;
453 	if (hdr->iovec_count && hdr->dxfer_len) {
454 		struct iov_iter i;
455 		struct iovec *iov = NULL;
456 
457 		ret = import_iovec(rq_data_dir(rq), hdr->dxferp,
458 				   hdr->iovec_count, 0, &iov, &i);
459 		if (ret < 0)
460 			goto out_put_request;
461 
462 		/* SG_IO howto says that the shorter of the two wins */
463 		iov_iter_truncate(&i, hdr->dxfer_len);
464 
465 		ret = blk_rq_map_user_iov(rq->q, rq, NULL, &i, GFP_KERNEL);
466 		kfree(iov);
467 	} else if (hdr->dxfer_len)
468 		ret = blk_rq_map_user(rq->q, rq, NULL, hdr->dxferp,
469 				      hdr->dxfer_len, GFP_KERNEL);
470 
471 	if (ret)
472 		goto out_put_request;
473 
474 	bio = rq->bio;
475 	scmd->allowed = 0;
476 
477 	start_time = jiffies;
478 
479 	blk_execute_rq(rq, at_head);
480 
481 	hdr->duration = jiffies_to_msecs(jiffies - start_time);
482 
483 	ret = scsi_complete_sghdr_rq(rq, hdr, bio);
484 
485 out_put_request:
486 	blk_mq_free_request(rq);
487 	return ret;
488 }
489 
490 /**
491  * sg_scsi_ioctl  --  handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
492  * @q:		request queue to send scsi commands down
493  * @mode:	mode used to open the file through which the ioctl has been
494  *		submitted
495  * @sic:	userspace structure describing the command to perform
496  *
497  * Send down the scsi command described by @sic to the device below
498  * the request queue @q.
499  *
500  * Notes:
501  *   -  This interface is deprecated - users should use the SG_IO
502  *      interface instead, as this is a more flexible approach to
503  *      performing SCSI commands on a device.
504  *   -  The SCSI command length is determined by examining the 1st byte
505  *      of the given command. There is no way to override this.
506  *   -  Data transfers are limited to PAGE_SIZE
507  *   -  The length (x + y) must be at least OMAX_SB_LEN bytes long to
508  *      accommodate the sense buffer when an error occurs.
509  *      The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
510  *      old code will not be surprised.
511  *   -  If a Unix error occurs (e.g. ENOMEM) then the user will receive
512  *      a negative return and the Unix error code in 'errno'.
513  *      If the SCSI command succeeds then 0 is returned.
514  *      Positive numbers returned are the compacted SCSI error codes (4
515  *      bytes in one int) where the lowest byte is the SCSI status.
516  */
sg_scsi_ioctl(struct request_queue * q,fmode_t mode,struct scsi_ioctl_command __user * sic)517 static int sg_scsi_ioctl(struct request_queue *q, fmode_t mode,
518 		struct scsi_ioctl_command __user *sic)
519 {
520 	struct request *rq;
521 	int err;
522 	unsigned int in_len, out_len, bytes, opcode, cmdlen;
523 	struct scsi_cmnd *scmd;
524 	char *buffer = NULL;
525 
526 	if (!sic)
527 		return -EINVAL;
528 
529 	/*
530 	 * get in an out lengths, verify they don't exceed a page worth of data
531 	 */
532 	if (get_user(in_len, &sic->inlen))
533 		return -EFAULT;
534 	if (get_user(out_len, &sic->outlen))
535 		return -EFAULT;
536 	if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
537 		return -EINVAL;
538 	if (get_user(opcode, sic->data))
539 		return -EFAULT;
540 
541 	bytes = max(in_len, out_len);
542 	if (bytes) {
543 		buffer = kzalloc(bytes, GFP_NOIO | GFP_USER | __GFP_NOWARN);
544 		if (!buffer)
545 			return -ENOMEM;
546 
547 	}
548 
549 	rq = scsi_alloc_request(q, in_len ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
550 	if (IS_ERR(rq)) {
551 		err = PTR_ERR(rq);
552 		goto error_free_buffer;
553 	}
554 	scmd = blk_mq_rq_to_pdu(rq);
555 
556 	cmdlen = COMMAND_SIZE(opcode);
557 
558 	/*
559 	 * get command and data to send to device, if any
560 	 */
561 	err = -EFAULT;
562 	scmd->cmd_len = cmdlen;
563 	if (copy_from_user(scmd->cmnd, sic->data, cmdlen))
564 		goto error;
565 
566 	if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
567 		goto error;
568 
569 	err = -EPERM;
570 	if (!scsi_cmd_allowed(scmd->cmnd, mode))
571 		goto error;
572 
573 	/* default.  possible overridden later */
574 	scmd->allowed = 5;
575 
576 	switch (opcode) {
577 	case SEND_DIAGNOSTIC:
578 	case FORMAT_UNIT:
579 		rq->timeout = FORMAT_UNIT_TIMEOUT;
580 		scmd->allowed = 1;
581 		break;
582 	case START_STOP:
583 		rq->timeout = START_STOP_TIMEOUT;
584 		break;
585 	case MOVE_MEDIUM:
586 		rq->timeout = MOVE_MEDIUM_TIMEOUT;
587 		break;
588 	case READ_ELEMENT_STATUS:
589 		rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
590 		break;
591 	case READ_DEFECT_DATA:
592 		rq->timeout = READ_DEFECT_DATA_TIMEOUT;
593 		scmd->allowed = 1;
594 		break;
595 	default:
596 		rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
597 		break;
598 	}
599 
600 	if (bytes) {
601 		err = blk_rq_map_kern(q, rq, buffer, bytes, GFP_NOIO);
602 		if (err)
603 			goto error;
604 	}
605 
606 	blk_execute_rq(rq, false);
607 
608 	err = scmd->result & 0xff;	/* only 8 bit SCSI status */
609 	if (err) {
610 		if (scmd->sense_len && scmd->sense_buffer) {
611 			/* limit sense len for backward compatibility */
612 			if (copy_to_user(sic->data, scmd->sense_buffer,
613 					 min(scmd->sense_len, 16U)))
614 				err = -EFAULT;
615 		}
616 	} else {
617 		if (copy_to_user(sic->data, buffer, out_len))
618 			err = -EFAULT;
619 	}
620 
621 error:
622 	blk_mq_free_request(rq);
623 
624 error_free_buffer:
625 	kfree(buffer);
626 
627 	return err;
628 }
629 
put_sg_io_hdr(const struct sg_io_hdr * hdr,void __user * argp)630 int put_sg_io_hdr(const struct sg_io_hdr *hdr, void __user *argp)
631 {
632 #ifdef CONFIG_COMPAT
633 	if (in_compat_syscall()) {
634 		struct compat_sg_io_hdr hdr32 =  {
635 			.interface_id	 = hdr->interface_id,
636 			.dxfer_direction = hdr->dxfer_direction,
637 			.cmd_len	 = hdr->cmd_len,
638 			.mx_sb_len	 = hdr->mx_sb_len,
639 			.iovec_count	 = hdr->iovec_count,
640 			.dxfer_len	 = hdr->dxfer_len,
641 			.dxferp		 = (uintptr_t)hdr->dxferp,
642 			.cmdp		 = (uintptr_t)hdr->cmdp,
643 			.sbp		 = (uintptr_t)hdr->sbp,
644 			.timeout	 = hdr->timeout,
645 			.flags		 = hdr->flags,
646 			.pack_id	 = hdr->pack_id,
647 			.usr_ptr	 = (uintptr_t)hdr->usr_ptr,
648 			.status		 = hdr->status,
649 			.masked_status	 = hdr->masked_status,
650 			.msg_status	 = hdr->msg_status,
651 			.sb_len_wr	 = hdr->sb_len_wr,
652 			.host_status	 = hdr->host_status,
653 			.driver_status	 = hdr->driver_status,
654 			.resid		 = hdr->resid,
655 			.duration	 = hdr->duration,
656 			.info		 = hdr->info,
657 		};
658 
659 		if (copy_to_user(argp, &hdr32, sizeof(hdr32)))
660 			return -EFAULT;
661 
662 		return 0;
663 	}
664 #endif
665 
666 	if (copy_to_user(argp, hdr, sizeof(*hdr)))
667 		return -EFAULT;
668 
669 	return 0;
670 }
671 EXPORT_SYMBOL(put_sg_io_hdr);
672 
get_sg_io_hdr(struct sg_io_hdr * hdr,const void __user * argp)673 int get_sg_io_hdr(struct sg_io_hdr *hdr, const void __user *argp)
674 {
675 #ifdef CONFIG_COMPAT
676 	struct compat_sg_io_hdr hdr32;
677 
678 	if (in_compat_syscall()) {
679 		if (copy_from_user(&hdr32, argp, sizeof(hdr32)))
680 			return -EFAULT;
681 
682 		*hdr = (struct sg_io_hdr) {
683 			.interface_id	 = hdr32.interface_id,
684 			.dxfer_direction = hdr32.dxfer_direction,
685 			.cmd_len	 = hdr32.cmd_len,
686 			.mx_sb_len	 = hdr32.mx_sb_len,
687 			.iovec_count	 = hdr32.iovec_count,
688 			.dxfer_len	 = hdr32.dxfer_len,
689 			.dxferp		 = compat_ptr(hdr32.dxferp),
690 			.cmdp		 = compat_ptr(hdr32.cmdp),
691 			.sbp		 = compat_ptr(hdr32.sbp),
692 			.timeout	 = hdr32.timeout,
693 			.flags		 = hdr32.flags,
694 			.pack_id	 = hdr32.pack_id,
695 			.usr_ptr	 = compat_ptr(hdr32.usr_ptr),
696 			.status		 = hdr32.status,
697 			.masked_status	 = hdr32.masked_status,
698 			.msg_status	 = hdr32.msg_status,
699 			.sb_len_wr	 = hdr32.sb_len_wr,
700 			.host_status	 = hdr32.host_status,
701 			.driver_status	 = hdr32.driver_status,
702 			.resid		 = hdr32.resid,
703 			.duration	 = hdr32.duration,
704 			.info		 = hdr32.info,
705 		};
706 
707 		return 0;
708 	}
709 #endif
710 
711 	if (copy_from_user(hdr, argp, sizeof(*hdr)))
712 		return -EFAULT;
713 
714 	return 0;
715 }
716 EXPORT_SYMBOL(get_sg_io_hdr);
717 
718 #ifdef CONFIG_COMPAT
719 struct compat_cdrom_generic_command {
720 	unsigned char	cmd[CDROM_PACKET_SIZE];
721 	compat_caddr_t	buffer;
722 	compat_uint_t	buflen;
723 	compat_int_t	stat;
724 	compat_caddr_t	sense;
725 	unsigned char	data_direction;
726 	unsigned char	pad[3];
727 	compat_int_t	quiet;
728 	compat_int_t	timeout;
729 	compat_caddr_t	unused;
730 };
731 #endif
732 
scsi_get_cdrom_generic_arg(struct cdrom_generic_command * cgc,const void __user * arg)733 static int scsi_get_cdrom_generic_arg(struct cdrom_generic_command *cgc,
734 				      const void __user *arg)
735 {
736 #ifdef CONFIG_COMPAT
737 	if (in_compat_syscall()) {
738 		struct compat_cdrom_generic_command cgc32;
739 
740 		if (copy_from_user(&cgc32, arg, sizeof(cgc32)))
741 			return -EFAULT;
742 
743 		*cgc = (struct cdrom_generic_command) {
744 			.buffer		= compat_ptr(cgc32.buffer),
745 			.buflen		= cgc32.buflen,
746 			.stat		= cgc32.stat,
747 			.sense		= compat_ptr(cgc32.sense),
748 			.data_direction	= cgc32.data_direction,
749 			.quiet		= cgc32.quiet,
750 			.timeout	= cgc32.timeout,
751 			.unused		= compat_ptr(cgc32.unused),
752 		};
753 		memcpy(&cgc->cmd, &cgc32.cmd, CDROM_PACKET_SIZE);
754 		return 0;
755 	}
756 #endif
757 	if (copy_from_user(cgc, arg, sizeof(*cgc)))
758 		return -EFAULT;
759 
760 	return 0;
761 }
762 
scsi_put_cdrom_generic_arg(const struct cdrom_generic_command * cgc,void __user * arg)763 static int scsi_put_cdrom_generic_arg(const struct cdrom_generic_command *cgc,
764 				      void __user *arg)
765 {
766 #ifdef CONFIG_COMPAT
767 	if (in_compat_syscall()) {
768 		struct compat_cdrom_generic_command cgc32 = {
769 			.buffer		= (uintptr_t)(cgc->buffer),
770 			.buflen		= cgc->buflen,
771 			.stat		= cgc->stat,
772 			.sense		= (uintptr_t)(cgc->sense),
773 			.data_direction	= cgc->data_direction,
774 			.quiet		= cgc->quiet,
775 			.timeout	= cgc->timeout,
776 			.unused		= (uintptr_t)(cgc->unused),
777 		};
778 		memcpy(&cgc32.cmd, &cgc->cmd, CDROM_PACKET_SIZE);
779 
780 		if (copy_to_user(arg, &cgc32, sizeof(cgc32)))
781 			return -EFAULT;
782 
783 		return 0;
784 	}
785 #endif
786 	if (copy_to_user(arg, cgc, sizeof(*cgc)))
787 		return -EFAULT;
788 
789 	return 0;
790 }
791 
scsi_cdrom_send_packet(struct scsi_device * sdev,fmode_t mode,void __user * arg)792 static int scsi_cdrom_send_packet(struct scsi_device *sdev, fmode_t mode,
793 		void __user *arg)
794 {
795 	struct cdrom_generic_command cgc;
796 	struct sg_io_hdr hdr;
797 	int err;
798 
799 	err = scsi_get_cdrom_generic_arg(&cgc, arg);
800 	if (err)
801 		return err;
802 
803 	cgc.timeout = clock_t_to_jiffies(cgc.timeout);
804 	memset(&hdr, 0, sizeof(hdr));
805 	hdr.interface_id = 'S';
806 	hdr.cmd_len = sizeof(cgc.cmd);
807 	hdr.dxfer_len = cgc.buflen;
808 	switch (cgc.data_direction) {
809 	case CGC_DATA_UNKNOWN:
810 		hdr.dxfer_direction = SG_DXFER_UNKNOWN;
811 		break;
812 	case CGC_DATA_WRITE:
813 		hdr.dxfer_direction = SG_DXFER_TO_DEV;
814 		break;
815 	case CGC_DATA_READ:
816 		hdr.dxfer_direction = SG_DXFER_FROM_DEV;
817 		break;
818 	case CGC_DATA_NONE:
819 		hdr.dxfer_direction = SG_DXFER_NONE;
820 		break;
821 	default:
822 		return -EINVAL;
823 	}
824 
825 	hdr.dxferp = cgc.buffer;
826 	hdr.sbp = cgc.sense;
827 	if (hdr.sbp)
828 		hdr.mx_sb_len = sizeof(struct request_sense);
829 	hdr.timeout = jiffies_to_msecs(cgc.timeout);
830 	hdr.cmdp = ((struct cdrom_generic_command __user *) arg)->cmd;
831 	hdr.cmd_len = sizeof(cgc.cmd);
832 
833 	err = sg_io(sdev, &hdr, mode);
834 	if (err == -EFAULT)
835 		return -EFAULT;
836 
837 	if (hdr.status)
838 		return -EIO;
839 
840 	cgc.stat = err;
841 	cgc.buflen = hdr.resid;
842 	if (scsi_put_cdrom_generic_arg(&cgc, arg))
843 		return -EFAULT;
844 
845 	return err;
846 }
847 
scsi_ioctl_sg_io(struct scsi_device * sdev,fmode_t mode,void __user * argp)848 static int scsi_ioctl_sg_io(struct scsi_device *sdev, fmode_t mode,
849 		void __user *argp)
850 {
851 	struct sg_io_hdr hdr;
852 	int error;
853 
854 	error = get_sg_io_hdr(&hdr, argp);
855 	if (error)
856 		return error;
857 	error = sg_io(sdev, &hdr, mode);
858 	if (error == -EFAULT)
859 		return error;
860 	if (put_sg_io_hdr(&hdr, argp))
861 		return -EFAULT;
862 	return error;
863 }
864 
865 /**
866  * scsi_ioctl - Dispatch ioctl to scsi device
867  * @sdev: scsi device receiving ioctl
868  * @mode: mode the block/char device is opened with
869  * @cmd: which ioctl is it
870  * @arg: data associated with ioctl
871  *
872  * Description: The scsi_ioctl() function differs from most ioctls in that it
873  * does not take a major/minor number as the dev field.  Rather, it takes
874  * a pointer to a &struct scsi_device.
875  */
scsi_ioctl(struct scsi_device * sdev,fmode_t mode,int cmd,void __user * arg)876 int scsi_ioctl(struct scsi_device *sdev, fmode_t mode, int cmd,
877 		void __user *arg)
878 {
879 	struct request_queue *q = sdev->request_queue;
880 	struct scsi_sense_hdr sense_hdr;
881 
882 	/* Check for deprecated ioctls ... all the ioctls which don't
883 	 * follow the new unique numbering scheme are deprecated */
884 	switch (cmd) {
885 	case SCSI_IOCTL_SEND_COMMAND:
886 	case SCSI_IOCTL_TEST_UNIT_READY:
887 	case SCSI_IOCTL_BENCHMARK_COMMAND:
888 	case SCSI_IOCTL_SYNC:
889 	case SCSI_IOCTL_START_UNIT:
890 	case SCSI_IOCTL_STOP_UNIT:
891 		printk(KERN_WARNING "program %s is using a deprecated SCSI "
892 		       "ioctl, please convert it to SG_IO\n", current->comm);
893 		break;
894 	default:
895 		break;
896 	}
897 
898 	switch (cmd) {
899 	case SG_GET_VERSION_NUM:
900 		return sg_get_version(arg);
901 	case SG_SET_TIMEOUT:
902 		return sg_set_timeout(sdev, arg);
903 	case SG_GET_TIMEOUT:
904 		return jiffies_to_clock_t(sdev->sg_timeout);
905 	case SG_GET_RESERVED_SIZE:
906 		return sg_get_reserved_size(sdev, arg);
907 	case SG_SET_RESERVED_SIZE:
908 		return sg_set_reserved_size(sdev, arg);
909 	case SG_EMULATED_HOST:
910 		return sg_emulated_host(q, arg);
911 	case SG_IO:
912 		return scsi_ioctl_sg_io(sdev, mode, arg);
913 	case SCSI_IOCTL_SEND_COMMAND:
914 		return sg_scsi_ioctl(q, mode, arg);
915 	case CDROM_SEND_PACKET:
916 		return scsi_cdrom_send_packet(sdev, mode, arg);
917 	case CDROMCLOSETRAY:
918 		return scsi_send_start_stop(sdev, 3);
919 	case CDROMEJECT:
920 		return scsi_send_start_stop(sdev, 2);
921 	case SCSI_IOCTL_GET_IDLUN:
922 		return scsi_get_idlun(sdev, arg);
923 	case SCSI_IOCTL_GET_BUS_NUMBER:
924 		return put_user(sdev->host->host_no, (int __user *)arg);
925 	case SCSI_IOCTL_PROBE_HOST:
926 		return ioctl_probe(sdev->host, arg);
927 	case SCSI_IOCTL_DOORLOCK:
928 		return scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
929 	case SCSI_IOCTL_DOORUNLOCK:
930 		return scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
931 	case SCSI_IOCTL_TEST_UNIT_READY:
932 		return scsi_test_unit_ready(sdev, IOCTL_NORMAL_TIMEOUT,
933 					    NORMAL_RETRIES, &sense_hdr);
934 	case SCSI_IOCTL_START_UNIT:
935 		return scsi_send_start_stop(sdev, 1);
936 	case SCSI_IOCTL_STOP_UNIT:
937 		return scsi_send_start_stop(sdev, 0);
938         case SCSI_IOCTL_GET_PCI:
939                 return scsi_ioctl_get_pci(sdev, arg);
940 	case SG_SCSI_RESET:
941 		return scsi_ioctl_reset(sdev, arg);
942 	}
943 
944 #ifdef CONFIG_COMPAT
945 	if (in_compat_syscall()) {
946 		if (!sdev->host->hostt->compat_ioctl)
947 			return -EINVAL;
948 		return sdev->host->hostt->compat_ioctl(sdev, cmd, arg);
949 	}
950 #endif
951 	if (!sdev->host->hostt->ioctl)
952 		return -EINVAL;
953 	return sdev->host->hostt->ioctl(sdev, cmd, arg);
954 }
955 EXPORT_SYMBOL(scsi_ioctl);
956 
957 /*
958  * We can process a reset even when a device isn't fully operable.
959  */
scsi_ioctl_block_when_processing_errors(struct scsi_device * sdev,int cmd,bool ndelay)960 int scsi_ioctl_block_when_processing_errors(struct scsi_device *sdev, int cmd,
961 		bool ndelay)
962 {
963 	if (cmd == SG_SCSI_RESET && ndelay) {
964 		if (scsi_host_in_recovery(sdev->host))
965 			return -EAGAIN;
966 	} else {
967 		if (!scsi_block_when_processing_errors(sdev))
968 			return -ENODEV;
969 	}
970 
971 	return 0;
972 }
973 EXPORT_SYMBOL_GPL(scsi_ioctl_block_when_processing_errors);
974