block/scsi_ioctl.c

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