1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Changes: 4 * Arnaldo Carvalho de Melo <acme@conectiva.com.br> 08/23/2000 5 * - get rid of some verify_areas and use __copy*user and __get/put_user 6 * for the ones that remain 7 */ 8 #include <linux/module.h> 9 #include <linux/blkdev.h> 10 #include <linux/interrupt.h> 11 #include <linux/errno.h> 12 #include <linux/kernel.h> 13 #include <linux/sched.h> 14 #include <linux/mm.h> 15 #include <linux/string.h> 16 #include <linux/uaccess.h> 17 #include <linux/cdrom.h> 18 19 #include <scsi/scsi.h> 20 #include <scsi/scsi_cmnd.h> 21 #include <scsi/scsi_device.h> 22 #include <scsi/scsi_eh.h> 23 #include <scsi/scsi_host.h> 24 #include <scsi/scsi_ioctl.h> 25 #include <scsi/sg.h> 26 #include <scsi/scsi_dbg.h> 27 28 #include "scsi_logging.h" 29 30 #define NORMAL_RETRIES 5 31 #define IOCTL_NORMAL_TIMEOUT (10 * HZ) 32 33 #define MAX_BUF PAGE_SIZE 34 35 /** 36 * ioctl_probe -- return host identification 37 * @host: host to identify 38 * @buffer: userspace buffer for identification 39 * 40 * Return an identifying string at @buffer, if @buffer is non-NULL, filling 41 * to the length stored at * (int *) @buffer. 42 */ 43 static int ioctl_probe(struct Scsi_Host *host, void __user *buffer) 44 { 45 unsigned int len, slen; 46 const char *string; 47 48 if (buffer) { 49 if (get_user(len, (unsigned int __user *) buffer)) 50 return -EFAULT; 51 52 if (host->hostt->info) 53 string = host->hostt->info(host); 54 else 55 string = host->hostt->name; 56 if (string) { 57 slen = strlen(string); 58 if (len > slen) 59 len = slen + 1; 60 if (copy_to_user(buffer, string, len)) 61 return -EFAULT; 62 } 63 } 64 return 1; 65 } 66 67 static int ioctl_internal_command(struct scsi_device *sdev, char *cmd, 68 int timeout, int retries) 69 { 70 int result; 71 struct scsi_sense_hdr sshdr; 72 73 SCSI_LOG_IOCTL(1, sdev_printk(KERN_INFO, sdev, 74 "Trying ioctl with scsi command %d\n", *cmd)); 75 76 result = scsi_execute_req(sdev, cmd, DMA_NONE, NULL, 0, 77 &sshdr, timeout, retries, NULL); 78 79 SCSI_LOG_IOCTL(2, sdev_printk(KERN_INFO, sdev, 80 "Ioctl returned 0x%x\n", result)); 81 82 if (result < 0) 83 goto out; 84 if (scsi_sense_valid(&sshdr)) { 85 switch (sshdr.sense_key) { 86 case ILLEGAL_REQUEST: 87 if (cmd[0] == ALLOW_MEDIUM_REMOVAL) 88 sdev->lockable = 0; 89 else 90 sdev_printk(KERN_INFO, sdev, 91 "ioctl_internal_command: " 92 "ILLEGAL REQUEST " 93 "asc=0x%x ascq=0x%x\n", 94 sshdr.asc, sshdr.ascq); 95 break; 96 case NOT_READY: /* This happens if there is no disc in drive */ 97 if (sdev->removable) 98 break; 99 fallthrough; 100 case UNIT_ATTENTION: 101 if (sdev->removable) { 102 sdev->changed = 1; 103 result = 0; /* This is no longer considered an error */ 104 break; 105 } 106 fallthrough; /* for non-removable media */ 107 default: 108 sdev_printk(KERN_INFO, sdev, 109 "ioctl_internal_command return code = %x\n", 110 result); 111 scsi_print_sense_hdr(sdev, NULL, &sshdr); 112 break; 113 } 114 } 115 out: 116 SCSI_LOG_IOCTL(2, sdev_printk(KERN_INFO, sdev, 117 "IOCTL Releasing command\n")); 118 return result; 119 } 120 121 int scsi_set_medium_removal(struct scsi_device *sdev, char state) 122 { 123 char scsi_cmd[MAX_COMMAND_SIZE]; 124 int ret; 125 126 if (!sdev->removable || !sdev->lockable) 127 return 0; 128 129 scsi_cmd[0] = ALLOW_MEDIUM_REMOVAL; 130 scsi_cmd[1] = 0; 131 scsi_cmd[2] = 0; 132 scsi_cmd[3] = 0; 133 scsi_cmd[4] = state; 134 scsi_cmd[5] = 0; 135 136 ret = ioctl_internal_command(sdev, scsi_cmd, 137 IOCTL_NORMAL_TIMEOUT, NORMAL_RETRIES); 138 if (ret == 0) 139 sdev->locked = (state == SCSI_REMOVAL_PREVENT); 140 return ret; 141 } 142 EXPORT_SYMBOL(scsi_set_medium_removal); 143 144 /* 145 * The scsi_ioctl_get_pci() function places into arg the value 146 * pci_dev::slot_name (8 characters) for the PCI device (if any). 147 * Returns: 0 on success 148 * -ENXIO if there isn't a PCI device pointer 149 * (could be because the SCSI driver hasn't been 150 * updated yet, or because it isn't a SCSI 151 * device) 152 * any copy_to_user() error on failure there 153 */ 154 static int scsi_ioctl_get_pci(struct scsi_device *sdev, void __user *arg) 155 { 156 struct device *dev = scsi_get_device(sdev->host); 157 const char *name; 158 159 if (!dev) 160 return -ENXIO; 161 162 name = dev_name(dev); 163 164 /* compatibility with old ioctl which only returned 165 * 20 characters */ 166 return copy_to_user(arg, name, min(strlen(name), (size_t)20)) 167 ? -EFAULT: 0; 168 } 169 170 static int sg_get_version(int __user *p) 171 { 172 static const int sg_version_num = 30527; 173 return put_user(sg_version_num, p); 174 } 175 176 static int sg_set_timeout(struct scsi_device *sdev, int __user *p) 177 { 178 int timeout, err = get_user(timeout, p); 179 180 if (!err) 181 sdev->sg_timeout = clock_t_to_jiffies(timeout); 182 183 return err; 184 } 185 186 static int sg_get_reserved_size(struct scsi_device *sdev, int __user *p) 187 { 188 int val = min(sdev->sg_reserved_size, 189 queue_max_bytes(sdev->request_queue)); 190 191 return put_user(val, p); 192 } 193 194 static int sg_set_reserved_size(struct scsi_device *sdev, int __user *p) 195 { 196 int size, err = get_user(size, p); 197 198 if (err) 199 return err; 200 201 if (size < 0) 202 return -EINVAL; 203 204 sdev->sg_reserved_size = min_t(unsigned int, size, 205 queue_max_bytes(sdev->request_queue)); 206 return 0; 207 } 208 209 /* 210 * will always return that we are ATAPI even for a real SCSI drive, I'm not 211 * so sure this is worth doing anything about (why would you care??) 212 */ 213 static int sg_emulated_host(struct request_queue *q, int __user *p) 214 { 215 return put_user(1, p); 216 } 217 218 static int scsi_get_idlun(struct scsi_device *sdev, void __user *argp) 219 { 220 struct scsi_idlun v = { 221 .dev_id = (sdev->id & 0xff) + 222 ((sdev->lun & 0xff) << 8) + 223 ((sdev->channel & 0xff) << 16) + 224 ((sdev->host->host_no & 0xff) << 24), 225 .host_unique_id = sdev->host->unique_id 226 }; 227 if (copy_to_user(argp, &v, sizeof(struct scsi_idlun))) 228 return -EFAULT; 229 return 0; 230 } 231 232 static int scsi_send_start_stop(struct scsi_device *sdev, int data) 233 { 234 u8 cdb[MAX_COMMAND_SIZE] = { }; 235 236 cdb[0] = START_STOP; 237 cdb[4] = data; 238 return ioctl_internal_command(sdev, cdb, START_STOP_TIMEOUT, 239 NORMAL_RETRIES); 240 } 241 242 /* 243 * Check if the given command is allowed. 244 * 245 * Only a subset of commands are allowed for unprivileged users. Commands used 246 * to format the media, update the firmware, etc. are not permitted. 247 */ 248 bool scsi_cmd_allowed(unsigned char *cmd, fmode_t mode) 249 { 250 /* root can do any command. */ 251 if (capable(CAP_SYS_RAWIO)) 252 return true; 253 254 /* Anybody who can open the device can do a read-safe command */ 255 switch (cmd[0]) { 256 /* Basic read-only commands */ 257 case TEST_UNIT_READY: 258 case REQUEST_SENSE: 259 case READ_6: 260 case READ_10: 261 case READ_12: 262 case READ_16: 263 case READ_BUFFER: 264 case READ_DEFECT_DATA: 265 case READ_CAPACITY: /* also GPCMD_READ_CDVD_CAPACITY */ 266 case READ_LONG: 267 case INQUIRY: 268 case MODE_SENSE: 269 case MODE_SENSE_10: 270 case LOG_SENSE: 271 case START_STOP: 272 case GPCMD_VERIFY_10: 273 case VERIFY_16: 274 case REPORT_LUNS: 275 case SERVICE_ACTION_IN_16: 276 case RECEIVE_DIAGNOSTIC: 277 case MAINTENANCE_IN: /* also GPCMD_SEND_KEY, which is a write command */ 278 case GPCMD_READ_BUFFER_CAPACITY: 279 /* Audio CD commands */ 280 case GPCMD_PLAY_CD: 281 case GPCMD_PLAY_AUDIO_10: 282 case GPCMD_PLAY_AUDIO_MSF: 283 case GPCMD_PLAY_AUDIO_TI: 284 case GPCMD_PAUSE_RESUME: 285 /* CD/DVD data reading */ 286 case GPCMD_READ_CD: 287 case GPCMD_READ_CD_MSF: 288 case GPCMD_READ_DISC_INFO: 289 case GPCMD_READ_DVD_STRUCTURE: 290 case GPCMD_READ_HEADER: 291 case GPCMD_READ_TRACK_RZONE_INFO: 292 case GPCMD_READ_SUBCHANNEL: 293 case GPCMD_READ_TOC_PMA_ATIP: 294 case GPCMD_REPORT_KEY: 295 case GPCMD_SCAN: 296 case GPCMD_GET_CONFIGURATION: 297 case GPCMD_READ_FORMAT_CAPACITIES: 298 case GPCMD_GET_EVENT_STATUS_NOTIFICATION: 299 case GPCMD_GET_PERFORMANCE: 300 case GPCMD_SEEK: 301 case GPCMD_STOP_PLAY_SCAN: 302 /* ZBC */ 303 case ZBC_IN: 304 return true; 305 /* Basic writing commands */ 306 case WRITE_6: 307 case WRITE_10: 308 case WRITE_VERIFY: 309 case WRITE_12: 310 case WRITE_VERIFY_12: 311 case WRITE_16: 312 case WRITE_LONG: 313 case WRITE_LONG_2: 314 case WRITE_SAME: 315 case WRITE_SAME_16: 316 case WRITE_SAME_32: 317 case ERASE: 318 case GPCMD_MODE_SELECT_10: 319 case MODE_SELECT: 320 case LOG_SELECT: 321 case GPCMD_BLANK: 322 case GPCMD_CLOSE_TRACK: 323 case GPCMD_FLUSH_CACHE: 324 case GPCMD_FORMAT_UNIT: 325 case GPCMD_REPAIR_RZONE_TRACK: 326 case GPCMD_RESERVE_RZONE_TRACK: 327 case GPCMD_SEND_DVD_STRUCTURE: 328 case GPCMD_SEND_EVENT: 329 case GPCMD_SEND_OPC: 330 case GPCMD_SEND_CUE_SHEET: 331 case GPCMD_SET_SPEED: 332 case GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL: 333 case GPCMD_LOAD_UNLOAD: 334 case GPCMD_SET_STREAMING: 335 case GPCMD_SET_READ_AHEAD: 336 /* ZBC */ 337 case ZBC_OUT: 338 return (mode & FMODE_WRITE); 339 default: 340 return false; 341 } 342 } 343 EXPORT_SYMBOL(scsi_cmd_allowed); 344 345 static int scsi_fill_sghdr_rq(struct scsi_device *sdev, struct request *rq, 346 struct sg_io_hdr *hdr, fmode_t mode) 347 { 348 struct scsi_request *req = scsi_req(rq); 349 350 if (copy_from_user(req->cmd, hdr->cmdp, hdr->cmd_len)) 351 return -EFAULT; 352 if (!scsi_cmd_allowed(req->cmd, mode)) 353 return -EPERM; 354 355 /* 356 * fill in request structure 357 */ 358 req->cmd_len = hdr->cmd_len; 359 360 rq->timeout = msecs_to_jiffies(hdr->timeout); 361 if (!rq->timeout) 362 rq->timeout = sdev->sg_timeout; 363 if (!rq->timeout) 364 rq->timeout = BLK_DEFAULT_SG_TIMEOUT; 365 if (rq->timeout < BLK_MIN_SG_TIMEOUT) 366 rq->timeout = BLK_MIN_SG_TIMEOUT; 367 368 return 0; 369 } 370 371 static int scsi_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr, 372 struct bio *bio) 373 { 374 struct scsi_request *req = scsi_req(rq); 375 int r, ret = 0; 376 377 /* 378 * fill in all the output members 379 */ 380 hdr->status = req->result & 0xff; 381 hdr->masked_status = status_byte(req->result); 382 hdr->msg_status = COMMAND_COMPLETE; 383 hdr->host_status = host_byte(req->result); 384 hdr->driver_status = 0; 385 if (scsi_status_is_check_condition(hdr->status)) 386 hdr->driver_status = DRIVER_SENSE; 387 hdr->info = 0; 388 if (hdr->masked_status || hdr->host_status || hdr->driver_status) 389 hdr->info |= SG_INFO_CHECK; 390 hdr->resid = req->resid_len; 391 hdr->sb_len_wr = 0; 392 393 if (req->sense_len && hdr->sbp) { 394 int len = min((unsigned int) hdr->mx_sb_len, req->sense_len); 395 396 if (!copy_to_user(hdr->sbp, req->sense, len)) 397 hdr->sb_len_wr = len; 398 else 399 ret = -EFAULT; 400 } 401 402 r = blk_rq_unmap_user(bio); 403 if (!ret) 404 ret = r; 405 406 return ret; 407 } 408 409 static int sg_io(struct scsi_device *sdev, struct gendisk *disk, 410 struct sg_io_hdr *hdr, fmode_t mode) 411 { 412 unsigned long start_time; 413 ssize_t ret = 0; 414 int writing = 0; 415 int at_head = 0; 416 struct request *rq; 417 struct scsi_request *req; 418 struct bio *bio; 419 420 if (hdr->interface_id != 'S') 421 return -EINVAL; 422 423 if (hdr->dxfer_len > (queue_max_hw_sectors(sdev->request_queue) << 9)) 424 return -EIO; 425 426 if (hdr->dxfer_len) 427 switch (hdr->dxfer_direction) { 428 default: 429 return -EINVAL; 430 case SG_DXFER_TO_DEV: 431 writing = 1; 432 break; 433 case SG_DXFER_TO_FROM_DEV: 434 case SG_DXFER_FROM_DEV: 435 break; 436 } 437 if (hdr->flags & SG_FLAG_Q_AT_HEAD) 438 at_head = 1; 439 440 ret = -ENOMEM; 441 rq = blk_get_request(sdev->request_queue, writing ? 442 REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0); 443 if (IS_ERR(rq)) 444 return PTR_ERR(rq); 445 req = scsi_req(rq); 446 447 if (hdr->cmd_len > BLK_MAX_CDB) { 448 req->cmd = kzalloc(hdr->cmd_len, GFP_KERNEL); 449 if (!req->cmd) 450 goto out_put_request; 451 } 452 453 ret = scsi_fill_sghdr_rq(sdev, rq, hdr, mode); 454 if (ret < 0) 455 goto out_free_cdb; 456 457 ret = 0; 458 if (hdr->iovec_count) { 459 struct iov_iter i; 460 struct iovec *iov = NULL; 461 462 ret = import_iovec(rq_data_dir(rq), hdr->dxferp, 463 hdr->iovec_count, 0, &iov, &i); 464 if (ret < 0) 465 goto out_free_cdb; 466 467 /* SG_IO howto says that the shorter of the two wins */ 468 iov_iter_truncate(&i, hdr->dxfer_len); 469 470 ret = blk_rq_map_user_iov(rq->q, rq, NULL, &i, GFP_KERNEL); 471 kfree(iov); 472 } else if (hdr->dxfer_len) 473 ret = blk_rq_map_user(rq->q, rq, NULL, hdr->dxferp, 474 hdr->dxfer_len, GFP_KERNEL); 475 476 if (ret) 477 goto out_free_cdb; 478 479 bio = rq->bio; 480 req->retries = 0; 481 482 start_time = jiffies; 483 484 blk_execute_rq(disk, rq, at_head); 485 486 hdr->duration = jiffies_to_msecs(jiffies - start_time); 487 488 ret = scsi_complete_sghdr_rq(rq, hdr, bio); 489 490 out_free_cdb: 491 scsi_req_free_cmd(req); 492 out_put_request: 493 blk_put_request(rq); 494 return ret; 495 } 496 497 /** 498 * sg_scsi_ioctl -- handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl 499 * @q: request queue to send scsi commands down 500 * @disk: gendisk to operate on (option) 501 * @mode: mode used to open the file through which the ioctl has been 502 * submitted 503 * @sic: userspace structure describing the command to perform 504 * 505 * Send down the scsi command described by @sic to the device below 506 * the request queue @q. If @file is non-NULL it's used to perform 507 * fine-grained permission checks that allow users to send down 508 * non-destructive SCSI commands. If the caller has a struct gendisk 509 * available it should be passed in as @disk to allow the low level 510 * driver to use the information contained in it. A non-NULL @disk 511 * is only allowed if the caller knows that the low level driver doesn't 512 * need it (e.g. in the scsi subsystem). 513 * 514 * Notes: 515 * - This interface is deprecated - users should use the SG_IO 516 * interface instead, as this is a more flexible approach to 517 * performing SCSI commands on a device. 518 * - The SCSI command length is determined by examining the 1st byte 519 * of the given command. There is no way to override this. 520 * - Data transfers are limited to PAGE_SIZE 521 * - The length (x + y) must be at least OMAX_SB_LEN bytes long to 522 * accommodate the sense buffer when an error occurs. 523 * The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that 524 * old code will not be surprised. 525 * - If a Unix error occurs (e.g. ENOMEM) then the user will receive 526 * a negative return and the Unix error code in 'errno'. 527 * If the SCSI command succeeds then 0 is returned. 528 * Positive numbers returned are the compacted SCSI error codes (4 529 * bytes in one int) where the lowest byte is the SCSI status. 530 */ 531 static int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, 532 fmode_t mode, struct scsi_ioctl_command __user *sic) 533 { 534 enum { OMAX_SB_LEN = 16 }; /* For backward compatibility */ 535 struct request *rq; 536 struct scsi_request *req; 537 int err; 538 unsigned int in_len, out_len, bytes, opcode, cmdlen; 539 char *buffer = NULL; 540 541 if (!sic) 542 return -EINVAL; 543 544 /* 545 * get in an out lengths, verify they don't exceed a page worth of data 546 */ 547 if (get_user(in_len, &sic->inlen)) 548 return -EFAULT; 549 if (get_user(out_len, &sic->outlen)) 550 return -EFAULT; 551 if (in_len > PAGE_SIZE || out_len > PAGE_SIZE) 552 return -EINVAL; 553 if (get_user(opcode, sic->data)) 554 return -EFAULT; 555 556 bytes = max(in_len, out_len); 557 if (bytes) { 558 buffer = kzalloc(bytes, GFP_NOIO | GFP_USER | __GFP_NOWARN); 559 if (!buffer) 560 return -ENOMEM; 561 562 } 563 564 rq = blk_get_request(q, in_len ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0); 565 if (IS_ERR(rq)) { 566 err = PTR_ERR(rq); 567 goto error_free_buffer; 568 } 569 req = scsi_req(rq); 570 571 cmdlen = COMMAND_SIZE(opcode); 572 573 /* 574 * get command and data to send to device, if any 575 */ 576 err = -EFAULT; 577 req->cmd_len = cmdlen; 578 if (copy_from_user(req->cmd, sic->data, cmdlen)) 579 goto error; 580 581 if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len)) 582 goto error; 583 584 err = -EPERM; 585 if (!scsi_cmd_allowed(req->cmd, mode)) 586 goto error; 587 588 /* default. possible overridden later */ 589 req->retries = 5; 590 591 switch (opcode) { 592 case SEND_DIAGNOSTIC: 593 case FORMAT_UNIT: 594 rq->timeout = FORMAT_UNIT_TIMEOUT; 595 req->retries = 1; 596 break; 597 case START_STOP: 598 rq->timeout = START_STOP_TIMEOUT; 599 break; 600 case MOVE_MEDIUM: 601 rq->timeout = MOVE_MEDIUM_TIMEOUT; 602 break; 603 case READ_ELEMENT_STATUS: 604 rq->timeout = READ_ELEMENT_STATUS_TIMEOUT; 605 break; 606 case READ_DEFECT_DATA: 607 rq->timeout = READ_DEFECT_DATA_TIMEOUT; 608 req->retries = 1; 609 break; 610 default: 611 rq->timeout = BLK_DEFAULT_SG_TIMEOUT; 612 break; 613 } 614 615 if (bytes) { 616 err = blk_rq_map_kern(q, rq, buffer, bytes, GFP_NOIO); 617 if (err) 618 goto error; 619 } 620 621 blk_execute_rq(disk, rq, 0); 622 623 err = req->result & 0xff; /* only 8 bit SCSI status */ 624 if (err) { 625 if (req->sense_len && req->sense) { 626 bytes = (OMAX_SB_LEN > req->sense_len) ? 627 req->sense_len : OMAX_SB_LEN; 628 if (copy_to_user(sic->data, req->sense, bytes)) 629 err = -EFAULT; 630 } 631 } else { 632 if (copy_to_user(sic->data, buffer, out_len)) 633 err = -EFAULT; 634 } 635 636 error: 637 blk_put_request(rq); 638 639 error_free_buffer: 640 kfree(buffer); 641 642 return err; 643 } 644 645 int put_sg_io_hdr(const struct sg_io_hdr *hdr, void __user *argp) 646 { 647 #ifdef CONFIG_COMPAT 648 if (in_compat_syscall()) { 649 struct compat_sg_io_hdr hdr32 = { 650 .interface_id = hdr->interface_id, 651 .dxfer_direction = hdr->dxfer_direction, 652 .cmd_len = hdr->cmd_len, 653 .mx_sb_len = hdr->mx_sb_len, 654 .iovec_count = hdr->iovec_count, 655 .dxfer_len = hdr->dxfer_len, 656 .dxferp = (uintptr_t)hdr->dxferp, 657 .cmdp = (uintptr_t)hdr->cmdp, 658 .sbp = (uintptr_t)hdr->sbp, 659 .timeout = hdr->timeout, 660 .flags = hdr->flags, 661 .pack_id = hdr->pack_id, 662 .usr_ptr = (uintptr_t)hdr->usr_ptr, 663 .status = hdr->status, 664 .masked_status = hdr->masked_status, 665 .msg_status = hdr->msg_status, 666 .sb_len_wr = hdr->sb_len_wr, 667 .host_status = hdr->host_status, 668 .driver_status = hdr->driver_status, 669 .resid = hdr->resid, 670 .duration = hdr->duration, 671 .info = hdr->info, 672 }; 673 674 if (copy_to_user(argp, &hdr32, sizeof(hdr32))) 675 return -EFAULT; 676 677 return 0; 678 } 679 #endif 680 681 if (copy_to_user(argp, hdr, sizeof(*hdr))) 682 return -EFAULT; 683 684 return 0; 685 } 686 EXPORT_SYMBOL(put_sg_io_hdr); 687 688 int get_sg_io_hdr(struct sg_io_hdr *hdr, const void __user *argp) 689 { 690 #ifdef CONFIG_COMPAT 691 struct compat_sg_io_hdr hdr32; 692 693 if (in_compat_syscall()) { 694 if (copy_from_user(&hdr32, argp, sizeof(hdr32))) 695 return -EFAULT; 696 697 *hdr = (struct sg_io_hdr) { 698 .interface_id = hdr32.interface_id, 699 .dxfer_direction = hdr32.dxfer_direction, 700 .cmd_len = hdr32.cmd_len, 701 .mx_sb_len = hdr32.mx_sb_len, 702 .iovec_count = hdr32.iovec_count, 703 .dxfer_len = hdr32.dxfer_len, 704 .dxferp = compat_ptr(hdr32.dxferp), 705 .cmdp = compat_ptr(hdr32.cmdp), 706 .sbp = compat_ptr(hdr32.sbp), 707 .timeout = hdr32.timeout, 708 .flags = hdr32.flags, 709 .pack_id = hdr32.pack_id, 710 .usr_ptr = compat_ptr(hdr32.usr_ptr), 711 .status = hdr32.status, 712 .masked_status = hdr32.masked_status, 713 .msg_status = hdr32.msg_status, 714 .sb_len_wr = hdr32.sb_len_wr, 715 .host_status = hdr32.host_status, 716 .driver_status = hdr32.driver_status, 717 .resid = hdr32.resid, 718 .duration = hdr32.duration, 719 .info = hdr32.info, 720 }; 721 722 return 0; 723 } 724 #endif 725 726 if (copy_from_user(hdr, argp, sizeof(*hdr))) 727 return -EFAULT; 728 729 return 0; 730 } 731 EXPORT_SYMBOL(get_sg_io_hdr); 732 733 #ifdef CONFIG_COMPAT 734 struct compat_cdrom_generic_command { 735 unsigned char cmd[CDROM_PACKET_SIZE]; 736 compat_caddr_t buffer; 737 compat_uint_t buflen; 738 compat_int_t stat; 739 compat_caddr_t sense; 740 unsigned char data_direction; 741 unsigned char pad[3]; 742 compat_int_t quiet; 743 compat_int_t timeout; 744 compat_caddr_t unused; 745 }; 746 #endif 747 748 static int scsi_get_cdrom_generic_arg(struct cdrom_generic_command *cgc, 749 const void __user *arg) 750 { 751 #ifdef CONFIG_COMPAT 752 if (in_compat_syscall()) { 753 struct compat_cdrom_generic_command cgc32; 754 755 if (copy_from_user(&cgc32, arg, sizeof(cgc32))) 756 return -EFAULT; 757 758 *cgc = (struct cdrom_generic_command) { 759 .buffer = compat_ptr(cgc32.buffer), 760 .buflen = cgc32.buflen, 761 .stat = cgc32.stat, 762 .sense = compat_ptr(cgc32.sense), 763 .data_direction = cgc32.data_direction, 764 .quiet = cgc32.quiet, 765 .timeout = cgc32.timeout, 766 .unused = compat_ptr(cgc32.unused), 767 }; 768 memcpy(&cgc->cmd, &cgc32.cmd, CDROM_PACKET_SIZE); 769 return 0; 770 } 771 #endif 772 if (copy_from_user(cgc, arg, sizeof(*cgc))) 773 return -EFAULT; 774 775 return 0; 776 } 777 778 static int scsi_put_cdrom_generic_arg(const struct cdrom_generic_command *cgc, 779 void __user *arg) 780 { 781 #ifdef CONFIG_COMPAT 782 if (in_compat_syscall()) { 783 struct compat_cdrom_generic_command cgc32 = { 784 .buffer = (uintptr_t)(cgc->buffer), 785 .buflen = cgc->buflen, 786 .stat = cgc->stat, 787 .sense = (uintptr_t)(cgc->sense), 788 .data_direction = cgc->data_direction, 789 .quiet = cgc->quiet, 790 .timeout = cgc->timeout, 791 .unused = (uintptr_t)(cgc->unused), 792 }; 793 memcpy(&cgc32.cmd, &cgc->cmd, CDROM_PACKET_SIZE); 794 795 if (copy_to_user(arg, &cgc32, sizeof(cgc32))) 796 return -EFAULT; 797 798 return 0; 799 } 800 #endif 801 if (copy_to_user(arg, cgc, sizeof(*cgc))) 802 return -EFAULT; 803 804 return 0; 805 } 806 807 static int scsi_cdrom_send_packet(struct scsi_device *sdev, struct gendisk *disk, 808 fmode_t mode, void __user *arg) 809 { 810 struct cdrom_generic_command cgc; 811 struct sg_io_hdr hdr; 812 int err; 813 814 err = scsi_get_cdrom_generic_arg(&cgc, arg); 815 if (err) 816 return err; 817 818 cgc.timeout = clock_t_to_jiffies(cgc.timeout); 819 memset(&hdr, 0, sizeof(hdr)); 820 hdr.interface_id = 'S'; 821 hdr.cmd_len = sizeof(cgc.cmd); 822 hdr.dxfer_len = cgc.buflen; 823 switch (cgc.data_direction) { 824 case CGC_DATA_UNKNOWN: 825 hdr.dxfer_direction = SG_DXFER_UNKNOWN; 826 break; 827 case CGC_DATA_WRITE: 828 hdr.dxfer_direction = SG_DXFER_TO_DEV; 829 break; 830 case CGC_DATA_READ: 831 hdr.dxfer_direction = SG_DXFER_FROM_DEV; 832 break; 833 case CGC_DATA_NONE: 834 hdr.dxfer_direction = SG_DXFER_NONE; 835 break; 836 default: 837 return -EINVAL; 838 } 839 840 hdr.dxferp = cgc.buffer; 841 hdr.sbp = cgc.sense; 842 if (hdr.sbp) 843 hdr.mx_sb_len = sizeof(struct request_sense); 844 hdr.timeout = jiffies_to_msecs(cgc.timeout); 845 hdr.cmdp = ((struct cdrom_generic_command __user *) arg)->cmd; 846 hdr.cmd_len = sizeof(cgc.cmd); 847 848 err = sg_io(sdev, disk, &hdr, mode); 849 if (err == -EFAULT) 850 return -EFAULT; 851 852 if (hdr.status) 853 return -EIO; 854 855 cgc.stat = err; 856 cgc.buflen = hdr.resid; 857 if (scsi_put_cdrom_generic_arg(&cgc, arg)) 858 return -EFAULT; 859 860 return err; 861 } 862 863 static int scsi_ioctl_sg_io(struct scsi_device *sdev, struct gendisk *disk, 864 fmode_t mode, void __user *argp) 865 { 866 struct sg_io_hdr hdr; 867 int error; 868 869 error = get_sg_io_hdr(&hdr, argp); 870 if (error) 871 return error; 872 error = sg_io(sdev, disk, &hdr, mode); 873 if (error == -EFAULT) 874 return error; 875 if (put_sg_io_hdr(&hdr, argp)) 876 return -EFAULT; 877 return error; 878 } 879 880 /** 881 * scsi_ioctl - Dispatch ioctl to scsi device 882 * @sdev: scsi device receiving ioctl 883 * @disk: disk receiving the ioctl 884 * @mode: mode the block/char device is opened with 885 * @cmd: which ioctl is it 886 * @arg: data associated with ioctl 887 * 888 * Description: The scsi_ioctl() function differs from most ioctls in that it 889 * does not take a major/minor number as the dev field. Rather, it takes 890 * a pointer to a &struct scsi_device. 891 */ 892 int scsi_ioctl(struct scsi_device *sdev, struct gendisk *disk, fmode_t mode, 893 int cmd, void __user *arg) 894 { 895 struct request_queue *q = sdev->request_queue; 896 struct scsi_sense_hdr sense_hdr; 897 898 /* Check for deprecated ioctls ... all the ioctls which don't 899 * follow the new unique numbering scheme are deprecated */ 900 switch (cmd) { 901 case SCSI_IOCTL_SEND_COMMAND: 902 case SCSI_IOCTL_TEST_UNIT_READY: 903 case SCSI_IOCTL_BENCHMARK_COMMAND: 904 case SCSI_IOCTL_SYNC: 905 case SCSI_IOCTL_START_UNIT: 906 case SCSI_IOCTL_STOP_UNIT: 907 printk(KERN_WARNING "program %s is using a deprecated SCSI " 908 "ioctl, please convert it to SG_IO\n", current->comm); 909 break; 910 default: 911 break; 912 } 913 914 switch (cmd) { 915 case SG_GET_VERSION_NUM: 916 return sg_get_version(arg); 917 case SG_SET_TIMEOUT: 918 return sg_set_timeout(sdev, arg); 919 case SG_GET_TIMEOUT: 920 return jiffies_to_clock_t(sdev->sg_timeout); 921 case SG_GET_RESERVED_SIZE: 922 return sg_get_reserved_size(sdev, arg); 923 case SG_SET_RESERVED_SIZE: 924 return sg_set_reserved_size(sdev, arg); 925 case SG_EMULATED_HOST: 926 return sg_emulated_host(q, arg); 927 case SG_IO: 928 return scsi_ioctl_sg_io(sdev, disk, mode, arg); 929 case SCSI_IOCTL_SEND_COMMAND: 930 return sg_scsi_ioctl(q, disk, mode, arg); 931 case CDROM_SEND_PACKET: 932 return scsi_cdrom_send_packet(sdev, disk, mode, arg); 933 case CDROMCLOSETRAY: 934 return scsi_send_start_stop(sdev, 3); 935 case CDROMEJECT: 936 return scsi_send_start_stop(sdev, 2); 937 case SCSI_IOCTL_GET_IDLUN: 938 return scsi_get_idlun(sdev, arg); 939 case SCSI_IOCTL_GET_BUS_NUMBER: 940 return put_user(sdev->host->host_no, (int __user *)arg); 941 case SCSI_IOCTL_PROBE_HOST: 942 return ioctl_probe(sdev->host, arg); 943 case SCSI_IOCTL_DOORLOCK: 944 return scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT); 945 case SCSI_IOCTL_DOORUNLOCK: 946 return scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW); 947 case SCSI_IOCTL_TEST_UNIT_READY: 948 return scsi_test_unit_ready(sdev, IOCTL_NORMAL_TIMEOUT, 949 NORMAL_RETRIES, &sense_hdr); 950 case SCSI_IOCTL_START_UNIT: 951 return scsi_send_start_stop(sdev, 1); 952 case SCSI_IOCTL_STOP_UNIT: 953 return scsi_send_start_stop(sdev, 0); 954 case SCSI_IOCTL_GET_PCI: 955 return scsi_ioctl_get_pci(sdev, arg); 956 case SG_SCSI_RESET: 957 return scsi_ioctl_reset(sdev, arg); 958 } 959 960 #ifdef CONFIG_COMPAT 961 if (in_compat_syscall()) { 962 if (!sdev->host->hostt->compat_ioctl) 963 return -EINVAL; 964 return sdev->host->hostt->compat_ioctl(sdev, cmd, arg); 965 } 966 #endif 967 if (!sdev->host->hostt->ioctl) 968 return -EINVAL; 969 return sdev->host->hostt->ioctl(sdev, cmd, arg); 970 } 971 EXPORT_SYMBOL(scsi_ioctl); 972 973 /* 974 * We can process a reset even when a device isn't fully operable. 975 */ 976 int scsi_ioctl_block_when_processing_errors(struct scsi_device *sdev, int cmd, 977 bool ndelay) 978 { 979 if (cmd == SG_SCSI_RESET && ndelay) { 980 if (scsi_host_in_recovery(sdev->host)) 981 return -EAGAIN; 982 } else { 983 if (!scsi_block_when_processing_errors(sdev)) 984 return -ENODEV; 985 } 986 987 return 0; 988 } 989 EXPORT_SYMBOL_GPL(scsi_ioctl_block_when_processing_errors); 990