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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2001 Jens Axboe <axboe@suse.de>
4 */
5#include <linux/compat.h>
6#include <linux/kernel.h>
7#include <linux/errno.h>
8#include <linux/string.h>
9#include <linux/module.h>
10#include <linux/blkdev.h>
11#include <linux/capability.h>
12#include <linux/completion.h>
13#include <linux/cdrom.h>
14#include <linux/ratelimit.h>
15#include <linux/slab.h>
16#include <linux/times.h>
17#include <linux/uio.h>
18#include <linux/uaccess.h>
19
20#include <scsi/scsi.h>
21#include <scsi/scsi_ioctl.h>
22#include <scsi/scsi_cmnd.h>
23#include <scsi/sg.h>
24
25struct blk_cmd_filter {
26 unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
27 unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
28};
29
30static struct blk_cmd_filter blk_default_cmd_filter;
31
32/* Command group 3 is reserved and should never be used. */
33const unsigned char scsi_command_size_tbl[8] =
34{
35 6, 10, 10, 12,
36 16, 12, 10, 10
37};
38EXPORT_SYMBOL(scsi_command_size_tbl);
39
40#include <scsi/sg.h>
41
42static int sg_get_version(int __user *p)
43{
44 static const int sg_version_num = 30527;
45 return put_user(sg_version_num, p);
46}
47
48static int scsi_get_idlun(struct request_queue *q, int __user *p)
49{
50 return put_user(0, p);
51}
52
53static int scsi_get_bus(struct request_queue *q, int __user *p)
54{
55 return put_user(0, p);
56}
57
58static int sg_get_timeout(struct request_queue *q)
59{
60 return jiffies_to_clock_t(q->sg_timeout);
61}
62
63static int sg_set_timeout(struct request_queue *q, int __user *p)
64{
65 int timeout, err = get_user(timeout, p);
66
67 if (!err)
68 q->sg_timeout = clock_t_to_jiffies(timeout);
69
70 return err;
71}
72
73static int max_sectors_bytes(struct request_queue *q)
74{
75 unsigned int max_sectors = queue_max_sectors(q);
76
77 max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9);
78
79 return max_sectors << 9;
80}
81
82static int sg_get_reserved_size(struct request_queue *q, int __user *p)
83{
84 int val = min_t(int, q->sg_reserved_size, max_sectors_bytes(q));
85
86 return put_user(val, p);
87}
88
89static int sg_set_reserved_size(struct request_queue *q, int __user *p)
90{
91 int size, err = get_user(size, p);
92
93 if (err)
94 return err;
95
96 if (size < 0)
97 return -EINVAL;
98
99 q->sg_reserved_size = min(size, max_sectors_bytes(q));
100 return 0;
101}
102
103/*
104 * will always return that we are ATAPI even for a real SCSI drive, I'm not
105 * so sure this is worth doing anything about (why would you care??)
106 */
107static int sg_emulated_host(struct request_queue *q, int __user *p)
108{
109 return put_user(1, p);
110}
111
112static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter)
113{
114 /* Basic read-only commands */
115 __set_bit(TEST_UNIT_READY, filter->read_ok);
116 __set_bit(REQUEST_SENSE, filter->read_ok);
117 __set_bit(READ_6, filter->read_ok);
118 __set_bit(READ_10, filter->read_ok);
119 __set_bit(READ_12, filter->read_ok);
120 __set_bit(READ_16, filter->read_ok);
121 __set_bit(READ_BUFFER, filter->read_ok);
122 __set_bit(READ_DEFECT_DATA, filter->read_ok);
123 __set_bit(READ_CAPACITY, filter->read_ok);
124 __set_bit(READ_LONG, filter->read_ok);
125 __set_bit(INQUIRY, filter->read_ok);
126 __set_bit(MODE_SENSE, filter->read_ok);
127 __set_bit(MODE_SENSE_10, filter->read_ok);
128 __set_bit(LOG_SENSE, filter->read_ok);
129 __set_bit(START_STOP, filter->read_ok);
130 __set_bit(GPCMD_VERIFY_10, filter->read_ok);
131 __set_bit(VERIFY_16, filter->read_ok);
132 __set_bit(REPORT_LUNS, filter->read_ok);
133 __set_bit(SERVICE_ACTION_IN_16, filter->read_ok);
134 __set_bit(RECEIVE_DIAGNOSTIC, filter->read_ok);
135 __set_bit(MAINTENANCE_IN, filter->read_ok);
136 __set_bit(GPCMD_READ_BUFFER_CAPACITY, filter->read_ok);
137
138 /* Audio CD commands */
139 __set_bit(GPCMD_PLAY_CD, filter->read_ok);
140 __set_bit(GPCMD_PLAY_AUDIO_10, filter->read_ok);
141 __set_bit(GPCMD_PLAY_AUDIO_MSF, filter->read_ok);
142 __set_bit(GPCMD_PLAY_AUDIO_TI, filter->read_ok);
143 __set_bit(GPCMD_PAUSE_RESUME, filter->read_ok);
144
145 /* CD/DVD data reading */
146 __set_bit(GPCMD_READ_CD, filter->read_ok);
147 __set_bit(GPCMD_READ_CD_MSF, filter->read_ok);
148 __set_bit(GPCMD_READ_DISC_INFO, filter->read_ok);
149 __set_bit(GPCMD_READ_CDVD_CAPACITY, filter->read_ok);
150 __set_bit(GPCMD_READ_DVD_STRUCTURE, filter->read_ok);
151 __set_bit(GPCMD_READ_HEADER, filter->read_ok);
152 __set_bit(GPCMD_READ_TRACK_RZONE_INFO, filter->read_ok);
153 __set_bit(GPCMD_READ_SUBCHANNEL, filter->read_ok);
154 __set_bit(GPCMD_READ_TOC_PMA_ATIP, filter->read_ok);
155 __set_bit(GPCMD_REPORT_KEY, filter->read_ok);
156 __set_bit(GPCMD_SCAN, filter->read_ok);
157 __set_bit(GPCMD_GET_CONFIGURATION, filter->read_ok);
158 __set_bit(GPCMD_READ_FORMAT_CAPACITIES, filter->read_ok);
159 __set_bit(GPCMD_GET_EVENT_STATUS_NOTIFICATION, filter->read_ok);
160 __set_bit(GPCMD_GET_PERFORMANCE, filter->read_ok);
161 __set_bit(GPCMD_SEEK, filter->read_ok);
162 __set_bit(GPCMD_STOP_PLAY_SCAN, filter->read_ok);
163
164 /* Basic writing commands */
165 __set_bit(WRITE_6, filter->write_ok);
166 __set_bit(WRITE_10, filter->write_ok);
167 __set_bit(WRITE_VERIFY, filter->write_ok);
168 __set_bit(WRITE_12, filter->write_ok);
169 __set_bit(WRITE_VERIFY_12, filter->write_ok);
170 __set_bit(WRITE_16, filter->write_ok);
171 __set_bit(WRITE_LONG, filter->write_ok);
172 __set_bit(WRITE_LONG_2, filter->write_ok);
173 __set_bit(WRITE_SAME, filter->write_ok);
174 __set_bit(WRITE_SAME_16, filter->write_ok);
175 __set_bit(WRITE_SAME_32, filter->write_ok);
176 __set_bit(ERASE, filter->write_ok);
177 __set_bit(GPCMD_MODE_SELECT_10, filter->write_ok);
178 __set_bit(MODE_SELECT, filter->write_ok);
179 __set_bit(LOG_SELECT, filter->write_ok);
180 __set_bit(GPCMD_BLANK, filter->write_ok);
181 __set_bit(GPCMD_CLOSE_TRACK, filter->write_ok);
182 __set_bit(GPCMD_FLUSH_CACHE, filter->write_ok);
183 __set_bit(GPCMD_FORMAT_UNIT, filter->write_ok);
184 __set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok);
185 __set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok);
186 __set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok);
187 __set_bit(GPCMD_SEND_EVENT, filter->write_ok);
188 __set_bit(GPCMD_SEND_KEY, filter->write_ok);
189 __set_bit(GPCMD_SEND_OPC, filter->write_ok);
190 __set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok);
191 __set_bit(GPCMD_SET_SPEED, filter->write_ok);
192 __set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok);
193 __set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok);
194 __set_bit(GPCMD_SET_STREAMING, filter->write_ok);
195 __set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok);
196
197 /* ZBC Commands */
198 __set_bit(ZBC_OUT, filter->write_ok);
199 __set_bit(ZBC_IN, filter->read_ok);
200}
201
202int blk_verify_command(unsigned char *cmd, fmode_t mode)
203{
204 struct blk_cmd_filter *filter = &blk_default_cmd_filter;
205
206 /* root can do any command. */
207 if (capable(CAP_SYS_RAWIO))
208 return 0;
209
210 /* Anybody who can open the device can do a read-safe command */
211 if (test_bit(cmd[0], filter->read_ok))
212 return 0;
213
214 /* Write-safe commands require a writable open */
215 if (test_bit(cmd[0], filter->write_ok) && (mode & FMODE_WRITE))
216 return 0;
217
218 return -EPERM;
219}
220EXPORT_SYMBOL(blk_verify_command);
221
222static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq,
223 struct sg_io_hdr *hdr, fmode_t mode)
224{
225 struct scsi_request *req = scsi_req(rq);
226
227 if (copy_from_user(req->cmd, hdr->cmdp, hdr->cmd_len))
228 return -EFAULT;
229 if (blk_verify_command(req->cmd, mode))
230 return -EPERM;
231
232 /*
233 * fill in request structure
234 */
235 req->cmd_len = hdr->cmd_len;
236
237 rq->timeout = msecs_to_jiffies(hdr->timeout);
238 if (!rq->timeout)
239 rq->timeout = q->sg_timeout;
240 if (!rq->timeout)
241 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
242 if (rq->timeout < BLK_MIN_SG_TIMEOUT)
243 rq->timeout = BLK_MIN_SG_TIMEOUT;
244
245 return 0;
246}
247
248static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
249 struct bio *bio)
250{
251 struct scsi_request *req = scsi_req(rq);
252 int r, ret = 0;
253
254 /*
255 * fill in all the output members
256 */
257 hdr->status = req->result & 0xff;
258 hdr->masked_status = status_byte(req->result);
259 hdr->msg_status = msg_byte(req->result);
260 hdr->host_status = host_byte(req->result);
261 hdr->driver_status = driver_byte(req->result);
262 hdr->info = 0;
263 if (hdr->masked_status || hdr->host_status || hdr->driver_status)
264 hdr->info |= SG_INFO_CHECK;
265 hdr->resid = req->resid_len;
266 hdr->sb_len_wr = 0;
267
268 if (req->sense_len && hdr->sbp) {
269 int len = min((unsigned int) hdr->mx_sb_len, req->sense_len);
270
271 if (!copy_to_user(hdr->sbp, req->sense, len))
272 hdr->sb_len_wr = len;
273 else
274 ret = -EFAULT;
275 }
276
277 r = blk_rq_unmap_user(bio);
278 if (!ret)
279 ret = r;
280
281 return ret;
282}
283
284static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
285 struct sg_io_hdr *hdr, fmode_t mode)
286{
287 unsigned long start_time;
288 ssize_t ret = 0;
289 int writing = 0;
290 int at_head = 0;
291 struct request *rq;
292 struct scsi_request *req;
293 struct bio *bio;
294
295 if (hdr->interface_id != 'S')
296 return -EINVAL;
297
298 if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9))
299 return -EIO;
300
301 if (hdr->dxfer_len)
302 switch (hdr->dxfer_direction) {
303 default:
304 return -EINVAL;
305 case SG_DXFER_TO_DEV:
306 writing = 1;
307 break;
308 case SG_DXFER_TO_FROM_DEV:
309 case SG_DXFER_FROM_DEV:
310 break;
311 }
312 if (hdr->flags & SG_FLAG_Q_AT_HEAD)
313 at_head = 1;
314
315 ret = -ENOMEM;
316 rq = blk_get_request(q, writing ? REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0);
317 if (IS_ERR(rq))
318 return PTR_ERR(rq);
319 req = scsi_req(rq);
320
321 if (hdr->cmd_len > BLK_MAX_CDB) {
322 req->cmd = kzalloc(hdr->cmd_len, GFP_KERNEL);
323 if (!req->cmd)
324 goto out_put_request;
325 }
326
327 ret = blk_fill_sghdr_rq(q, rq, hdr, mode);
328 if (ret < 0)
329 goto out_free_cdb;
330
331 ret = 0;
332 if (hdr->iovec_count) {
333 struct iov_iter i;
334 struct iovec *iov = NULL;
335
336#ifdef CONFIG_COMPAT
337 if (in_compat_syscall())
338 ret = compat_import_iovec(rq_data_dir(rq),
339 hdr->dxferp, hdr->iovec_count,
340 0, &iov, &i);
341 else
342#endif
343 ret = import_iovec(rq_data_dir(rq),
344 hdr->dxferp, hdr->iovec_count,
345 0, &iov, &i);
346 if (ret < 0)
347 goto out_free_cdb;
348
349 /* SG_IO howto says that the shorter of the two wins */
350 iov_iter_truncate(&i, hdr->dxfer_len);
351
352 ret = blk_rq_map_user_iov(q, rq, NULL, &i, GFP_KERNEL);
353 kfree(iov);
354 } else if (hdr->dxfer_len)
355 ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
356 GFP_KERNEL);
357
358 if (ret)
359 goto out_free_cdb;
360
361 bio = rq->bio;
362 req->retries = 0;
363
364 start_time = jiffies;
365
366 /* ignore return value. All information is passed back to caller
367 * (if he doesn't check that is his problem).
368 * N.B. a non-zero SCSI status is _not_ necessarily an error.
369 */
370 blk_execute_rq(q, bd_disk, rq, at_head);
371
372 hdr->duration = jiffies_to_msecs(jiffies - start_time);
373
374 ret = blk_complete_sghdr_rq(rq, hdr, bio);
375
376out_free_cdb:
377 scsi_req_free_cmd(req);
378out_put_request:
379 blk_put_request(rq);
380 return ret;
381}
382
383/**
384 * sg_scsi_ioctl -- handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
385 * @q: request queue to send scsi commands down
386 * @disk: gendisk to operate on (option)
387 * @mode: mode used to open the file through which the ioctl has been
388 * submitted
389 * @sic: userspace structure describing the command to perform
390 *
391 * Send down the scsi command described by @sic to the device below
392 * the request queue @q. If @file is non-NULL it's used to perform
393 * fine-grained permission checks that allow users to send down
394 * non-destructive SCSI commands. If the caller has a struct gendisk
395 * available it should be passed in as @disk to allow the low level
396 * driver to use the information contained in it. A non-NULL @disk
397 * is only allowed if the caller knows that the low level driver doesn't
398 * need it (e.g. in the scsi subsystem).
399 *
400 * Notes:
401 * - This interface is deprecated - users should use the SG_IO
402 * interface instead, as this is a more flexible approach to
403 * performing SCSI commands on a device.
404 * - The SCSI command length is determined by examining the 1st byte
405 * of the given command. There is no way to override this.
406 * - Data transfers are limited to PAGE_SIZE
407 * - The length (x + y) must be at least OMAX_SB_LEN bytes long to
408 * accommodate the sense buffer when an error occurs.
409 * The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
410 * old code will not be surprised.
411 * - If a Unix error occurs (e.g. ENOMEM) then the user will receive
412 * a negative return and the Unix error code in 'errno'.
413 * If the SCSI command succeeds then 0 is returned.
414 * Positive numbers returned are the compacted SCSI error codes (4
415 * bytes in one int) where the lowest byte is the SCSI status.
416 */
417int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
418 struct scsi_ioctl_command __user *sic)
419{
420 enum { OMAX_SB_LEN = 16 }; /* For backward compatibility */
421 struct request *rq;
422 struct scsi_request *req;
423 int err;
424 unsigned int in_len, out_len, bytes, opcode, cmdlen;
425 char *buffer = NULL;
426
427 if (!sic)
428 return -EINVAL;
429
430 /*
431 * get in an out lengths, verify they don't exceed a page worth of data
432 */
433 if (get_user(in_len, &sic->inlen))
434 return -EFAULT;
435 if (get_user(out_len, &sic->outlen))
436 return -EFAULT;
437 if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
438 return -EINVAL;
439 if (get_user(opcode, sic->data))
440 return -EFAULT;
441
442 bytes = max(in_len, out_len);
443 if (bytes) {
444 buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
445 if (!buffer)
446 return -ENOMEM;
447
448 }
449
450 rq = blk_get_request(q, in_len ? REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0);
451 if (IS_ERR(rq)) {
452 err = PTR_ERR(rq);
453 goto error_free_buffer;
454 }
455 req = scsi_req(rq);
456
457 cmdlen = COMMAND_SIZE(opcode);
458
459 /*
460 * get command and data to send to device, if any
461 */
462 err = -EFAULT;
463 req->cmd_len = cmdlen;
464 if (copy_from_user(req->cmd, sic->data, cmdlen))
465 goto error;
466
467 if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
468 goto error;
469
470 err = blk_verify_command(req->cmd, mode);
471 if (err)
472 goto error;
473
474 /* default. possible overriden later */
475 req->retries = 5;
476
477 switch (opcode) {
478 case SEND_DIAGNOSTIC:
479 case FORMAT_UNIT:
480 rq->timeout = FORMAT_UNIT_TIMEOUT;
481 req->retries = 1;
482 break;
483 case START_STOP:
484 rq->timeout = START_STOP_TIMEOUT;
485 break;
486 case MOVE_MEDIUM:
487 rq->timeout = MOVE_MEDIUM_TIMEOUT;
488 break;
489 case READ_ELEMENT_STATUS:
490 rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
491 break;
492 case READ_DEFECT_DATA:
493 rq->timeout = READ_DEFECT_DATA_TIMEOUT;
494 req->retries = 1;
495 break;
496 default:
497 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
498 break;
499 }
500
501 if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, GFP_NOIO)) {
502 err = DRIVER_ERROR << 24;
503 goto error;
504 }
505
506 blk_execute_rq(q, disk, rq, 0);
507
508 err = req->result & 0xff; /* only 8 bit SCSI status */
509 if (err) {
510 if (req->sense_len && req->sense) {
511 bytes = (OMAX_SB_LEN > req->sense_len) ?
512 req->sense_len : OMAX_SB_LEN;
513 if (copy_to_user(sic->data, req->sense, bytes))
514 err = -EFAULT;
515 }
516 } else {
517 if (copy_to_user(sic->data, buffer, out_len))
518 err = -EFAULT;
519 }
520
521error:
522 blk_put_request(rq);
523
524error_free_buffer:
525 kfree(buffer);
526
527 return err;
528}
529EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
530
531/* Send basic block requests */
532static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
533 int cmd, int data)
534{
535 struct request *rq;
536 int err;
537
538 rq = blk_get_request(q, REQ_OP_SCSI_OUT, 0);
539 if (IS_ERR(rq))
540 return PTR_ERR(rq);
541 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
542 scsi_req(rq)->cmd[0] = cmd;
543 scsi_req(rq)->cmd[4] = data;
544 scsi_req(rq)->cmd_len = 6;
545 blk_execute_rq(q, bd_disk, rq, 0);
546 err = scsi_req(rq)->result ? -EIO : 0;
547 blk_put_request(rq);
548
549 return err;
550}
551
552static inline int blk_send_start_stop(struct request_queue *q,
553 struct gendisk *bd_disk, int data)
554{
555 return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
556}
557
558int put_sg_io_hdr(const struct sg_io_hdr *hdr, void __user *argp)
559{
560#ifdef CONFIG_COMPAT
561 if (in_compat_syscall()) {
562 struct compat_sg_io_hdr hdr32 = {
563 .interface_id = hdr->interface_id,
564 .dxfer_direction = hdr->dxfer_direction,
565 .cmd_len = hdr->cmd_len,
566 .mx_sb_len = hdr->mx_sb_len,
567 .iovec_count = hdr->iovec_count,
568 .dxfer_len = hdr->dxfer_len,
569 .dxferp = (uintptr_t)hdr->dxferp,
570 .cmdp = (uintptr_t)hdr->cmdp,
571 .sbp = (uintptr_t)hdr->sbp,
572 .timeout = hdr->timeout,
573 .flags = hdr->flags,
574 .pack_id = hdr->pack_id,
575 .usr_ptr = (uintptr_t)hdr->usr_ptr,
576 .status = hdr->status,
577 .masked_status = hdr->masked_status,
578 .msg_status = hdr->msg_status,
579 .sb_len_wr = hdr->sb_len_wr,
580 .host_status = hdr->host_status,
581 .driver_status = hdr->driver_status,
582 .resid = hdr->resid,
583 .duration = hdr->duration,
584 .info = hdr->info,
585 };
586
587 if (copy_to_user(argp, &hdr32, sizeof(hdr32)))
588 return -EFAULT;
589
590 return 0;
591 }
592#endif
593
594 if (copy_to_user(argp, hdr, sizeof(*hdr)))
595 return -EFAULT;
596
597 return 0;
598}
599EXPORT_SYMBOL(put_sg_io_hdr);
600
601int get_sg_io_hdr(struct sg_io_hdr *hdr, const void __user *argp)
602{
603#ifdef CONFIG_COMPAT
604 struct compat_sg_io_hdr hdr32;
605
606 if (in_compat_syscall()) {
607 if (copy_from_user(&hdr32, argp, sizeof(hdr32)))
608 return -EFAULT;
609
610 *hdr = (struct sg_io_hdr) {
611 .interface_id = hdr32.interface_id,
612 .dxfer_direction = hdr32.dxfer_direction,
613 .cmd_len = hdr32.cmd_len,
614 .mx_sb_len = hdr32.mx_sb_len,
615 .iovec_count = hdr32.iovec_count,
616 .dxfer_len = hdr32.dxfer_len,
617 .dxferp = compat_ptr(hdr32.dxferp),
618 .cmdp = compat_ptr(hdr32.cmdp),
619 .sbp = compat_ptr(hdr32.sbp),
620 .timeout = hdr32.timeout,
621 .flags = hdr32.flags,
622 .pack_id = hdr32.pack_id,
623 .usr_ptr = compat_ptr(hdr32.usr_ptr),
624 .status = hdr32.status,
625 .masked_status = hdr32.masked_status,
626 .msg_status = hdr32.msg_status,
627 .sb_len_wr = hdr32.sb_len_wr,
628 .host_status = hdr32.host_status,
629 .driver_status = hdr32.driver_status,
630 .resid = hdr32.resid,
631 .duration = hdr32.duration,
632 .info = hdr32.info,
633 };
634
635 return 0;
636 }
637#endif
638
639 if (copy_from_user(hdr, argp, sizeof(*hdr)))
640 return -EFAULT;
641
642 return 0;
643}
644EXPORT_SYMBOL(get_sg_io_hdr);
645
646#ifdef CONFIG_COMPAT
647struct compat_cdrom_generic_command {
648 unsigned char cmd[CDROM_PACKET_SIZE];
649 compat_caddr_t buffer;
650 compat_uint_t buflen;
651 compat_int_t stat;
652 compat_caddr_t sense;
653 unsigned char data_direction;
654 unsigned char pad[3];
655 compat_int_t quiet;
656 compat_int_t timeout;
657 compat_caddr_t reserved[1];
658};
659#endif
660
661static int scsi_get_cdrom_generic_arg(struct cdrom_generic_command *cgc,
662 const void __user *arg)
663{
664#ifdef CONFIG_COMPAT
665 if (in_compat_syscall()) {
666 struct compat_cdrom_generic_command cgc32;
667
668 if (copy_from_user(&cgc32, arg, sizeof(cgc32)))
669 return -EFAULT;
670
671 *cgc = (struct cdrom_generic_command) {
672 .buffer = compat_ptr(cgc32.buffer),
673 .buflen = cgc32.buflen,
674 .stat = cgc32.stat,
675 .sense = compat_ptr(cgc32.sense),
676 .data_direction = cgc32.data_direction,
677 .quiet = cgc32.quiet,
678 .timeout = cgc32.timeout,
679 .reserved[0] = compat_ptr(cgc32.reserved[0]),
680 };
681 memcpy(&cgc->cmd, &cgc32.cmd, CDROM_PACKET_SIZE);
682 return 0;
683 }
684#endif
685 if (copy_from_user(cgc, arg, sizeof(*cgc)))
686 return -EFAULT;
687
688 return 0;
689}
690
691static int scsi_put_cdrom_generic_arg(const struct cdrom_generic_command *cgc,
692 void __user *arg)
693{
694#ifdef CONFIG_COMPAT
695 if (in_compat_syscall()) {
696 struct compat_cdrom_generic_command cgc32 = {
697 .buffer = (uintptr_t)(cgc->buffer),
698 .buflen = cgc->buflen,
699 .stat = cgc->stat,
700 .sense = (uintptr_t)(cgc->sense),
701 .data_direction = cgc->data_direction,
702 .quiet = cgc->quiet,
703 .timeout = cgc->timeout,
704 .reserved[0] = (uintptr_t)(cgc->reserved[0]),
705 };
706 memcpy(&cgc32.cmd, &cgc->cmd, CDROM_PACKET_SIZE);
707
708 if (copy_to_user(arg, &cgc32, sizeof(cgc32)))
709 return -EFAULT;
710
711 return 0;
712 }
713#endif
714 if (copy_to_user(arg, cgc, sizeof(*cgc)))
715 return -EFAULT;
716
717 return 0;
718}
719
720static int scsi_cdrom_send_packet(struct request_queue *q,
721 struct gendisk *bd_disk,
722 fmode_t mode, void __user *arg)
723{
724 struct cdrom_generic_command cgc;
725 struct sg_io_hdr hdr;
726 int err;
727
728 err = scsi_get_cdrom_generic_arg(&cgc, arg);
729 if (err)
730 return err;
731
732 cgc.timeout = clock_t_to_jiffies(cgc.timeout);
733 memset(&hdr, 0, sizeof(hdr));
734 hdr.interface_id = 'S';
735 hdr.cmd_len = sizeof(cgc.cmd);
736 hdr.dxfer_len = cgc.buflen;
737 switch (cgc.data_direction) {
738 case CGC_DATA_UNKNOWN:
739 hdr.dxfer_direction = SG_DXFER_UNKNOWN;
740 break;
741 case CGC_DATA_WRITE:
742 hdr.dxfer_direction = SG_DXFER_TO_DEV;
743 break;
744 case CGC_DATA_READ:
745 hdr.dxfer_direction = SG_DXFER_FROM_DEV;
746 break;
747 case CGC_DATA_NONE:
748 hdr.dxfer_direction = SG_DXFER_NONE;
749 break;
750 default:
751 return -EINVAL;
752 }
753
754 hdr.dxferp = cgc.buffer;
755 hdr.sbp = cgc.sense;
756 if (hdr.sbp)
757 hdr.mx_sb_len = sizeof(struct request_sense);
758 hdr.timeout = jiffies_to_msecs(cgc.timeout);
759 hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
760 hdr.cmd_len = sizeof(cgc.cmd);
761
762 err = sg_io(q, bd_disk, &hdr, mode);
763 if (err == -EFAULT)
764 return -EFAULT;
765
766 if (hdr.status)
767 return -EIO;
768
769 cgc.stat = err;
770 cgc.buflen = hdr.resid;
771 if (scsi_put_cdrom_generic_arg(&cgc, arg))
772 return -EFAULT;
773
774 return err;
775}
776
777int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode,
778 unsigned int cmd, void __user *arg)
779{
780 int err;
781
782 if (!q)
783 return -ENXIO;
784
785 switch (cmd) {
786 /*
787 * new sgv3 interface
788 */
789 case SG_GET_VERSION_NUM:
790 err = sg_get_version(arg);
791 break;
792 case SCSI_IOCTL_GET_IDLUN:
793 err = scsi_get_idlun(q, arg);
794 break;
795 case SCSI_IOCTL_GET_BUS_NUMBER:
796 err = scsi_get_bus(q, arg);
797 break;
798 case SG_SET_TIMEOUT:
799 err = sg_set_timeout(q, arg);
800 break;
801 case SG_GET_TIMEOUT:
802 err = sg_get_timeout(q);
803 break;
804 case SG_GET_RESERVED_SIZE:
805 err = sg_get_reserved_size(q, arg);
806 break;
807 case SG_SET_RESERVED_SIZE:
808 err = sg_set_reserved_size(q, arg);
809 break;
810 case SG_EMULATED_HOST:
811 err = sg_emulated_host(q, arg);
812 break;
813 case SG_IO: {
814 struct sg_io_hdr hdr;
815
816 err = get_sg_io_hdr(&hdr, arg);
817 if (err)
818 break;
819 err = sg_io(q, bd_disk, &hdr, mode);
820 if (err == -EFAULT)
821 break;
822
823 if (put_sg_io_hdr(&hdr, arg))
824 err = -EFAULT;
825 break;
826 }
827 case CDROM_SEND_PACKET:
828 err = scsi_cdrom_send_packet(q, bd_disk, mode, arg);
829 break;
830
831 /*
832 * old junk scsi send command ioctl
833 */
834 case SCSI_IOCTL_SEND_COMMAND:
835 printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm);
836 err = -EINVAL;
837 if (!arg)
838 break;
839
840 err = sg_scsi_ioctl(q, bd_disk, mode, arg);
841 break;
842 case CDROMCLOSETRAY:
843 err = blk_send_start_stop(q, bd_disk, 0x03);
844 break;
845 case CDROMEJECT:
846 err = blk_send_start_stop(q, bd_disk, 0x02);
847 break;
848 default:
849 err = -ENOTTY;
850 }
851
852 return err;
853}
854EXPORT_SYMBOL(scsi_cmd_ioctl);
855
856int scsi_verify_blk_ioctl(struct block_device *bd, unsigned int cmd)
857{
858 if (bd && bd == bd->bd_contains)
859 return 0;
860
861 if (capable(CAP_SYS_RAWIO))
862 return 0;
863
864 return -ENOIOCTLCMD;
865}
866EXPORT_SYMBOL(scsi_verify_blk_ioctl);
867
868int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode,
869 unsigned int cmd, void __user *arg)
870{
871 int ret;
872
873 ret = scsi_verify_blk_ioctl(bd, cmd);
874 if (ret < 0)
875 return ret;
876
877 return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg);
878}
879EXPORT_SYMBOL(scsi_cmd_blk_ioctl);
880
881/**
882 * scsi_req_init - initialize certain fields of a scsi_request structure
883 * @req: Pointer to a scsi_request structure.
884 * Initializes .__cmd[], .cmd, .cmd_len and .sense_len but no other members
885 * of struct scsi_request.
886 */
887void scsi_req_init(struct scsi_request *req)
888{
889 memset(req->__cmd, 0, sizeof(req->__cmd));
890 req->cmd = req->__cmd;
891 req->cmd_len = BLK_MAX_CDB;
892 req->sense_len = 0;
893}
894EXPORT_SYMBOL(scsi_req_init);
895
896static int __init blk_scsi_ioctl_init(void)
897{
898 blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
899 return 0;
900}
901fs_initcall(blk_scsi_ioctl_init);