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