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