1/* 2 * Copyright (C) 2001 Jens Axboe <axboe@suse.de> 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public Licens 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111- 17 * 18 */ 19#include <linux/kernel.h> 20#include <linux/errno.h> 21#include <linux/string.h> 22#include <linux/module.h> 23#include <linux/blkdev.h> 24#include <linux/capability.h> 25#include <linux/completion.h> 26#include <linux/cdrom.h> 27#include <linux/ratelimit.h> 28#include <linux/slab.h> 29#include <linux/times.h> 30#include <linux/uio.h> 31#include <asm/uaccess.h> 32 33#include <scsi/scsi.h> 34#include <scsi/scsi_ioctl.h> 35#include <scsi/scsi_cmnd.h> 36 37struct blk_cmd_filter { 38 unsigned long read_ok[BLK_SCSI_CMD_PER_LONG]; 39 unsigned long write_ok[BLK_SCSI_CMD_PER_LONG]; 40}; 41 42static struct blk_cmd_filter blk_default_cmd_filter; 43 44/* Command group 3 is reserved and should never be used. */ 45const unsigned char scsi_command_size_tbl[8] = 46{ 47 6, 10, 10, 12, 48 16, 12, 10, 10 49}; 50EXPORT_SYMBOL(scsi_command_size_tbl); 51 52#include <scsi/sg.h> 53 54static int sg_get_version(int __user *p) 55{ 56 static const int sg_version_num = 30527; 57 return put_user(sg_version_num, p); 58} 59 60static int scsi_get_idlun(struct request_queue *q, int __user *p) 61{ 62 return put_user(0, p); 63} 64 65static int scsi_get_bus(struct request_queue *q, int __user *p) 66{ 67 return put_user(0, p); 68} 69 70static int sg_get_timeout(struct request_queue *q) 71{ 72 return jiffies_to_clock_t(q->sg_timeout); 73} 74 75static int sg_set_timeout(struct request_queue *q, int __user *p) 76{ 77 int timeout, err = get_user(timeout, p); 78 79 if (!err) 80 q->sg_timeout = clock_t_to_jiffies(timeout); 81 82 return err; 83} 84 85static int max_sectors_bytes(struct request_queue *q) 86{ 87 unsigned int max_sectors = queue_max_sectors(q); 88 89 max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9); 90 91 return max_sectors << 9; 92} 93 94static int sg_get_reserved_size(struct request_queue *q, int __user *p) 95{ 96 int val = min_t(int, q->sg_reserved_size, max_sectors_bytes(q)); 97 98 return put_user(val, p); 99} 100 101static int sg_set_reserved_size(struct request_queue *q, int __user *p) 102{ 103 int size, err = get_user(size, p); 104 105 if (err) 106 return err; 107 108 if (size < 0) 109 return -EINVAL; 110 111 q->sg_reserved_size = min(size, max_sectors_bytes(q)); 112 return 0; 113} 114 115/* 116 * will always return that we are ATAPI even for a real SCSI drive, I'm not 117 * so sure this is worth doing anything about (why would you care??) 118 */ 119static int sg_emulated_host(struct request_queue *q, int __user *p) 120{ 121 return put_user(1, p); 122} 123 124static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter) 125{ 126 /* Basic read-only commands */ 127 __set_bit(TEST_UNIT_READY, filter->read_ok); 128 __set_bit(REQUEST_SENSE, filter->read_ok); 129 __set_bit(READ_6, filter->read_ok); 130 __set_bit(READ_10, filter->read_ok); 131 __set_bit(READ_12, filter->read_ok); 132 __set_bit(READ_16, filter->read_ok); 133 __set_bit(READ_BUFFER, filter->read_ok); 134 __set_bit(READ_DEFECT_DATA, filter->read_ok); 135 __set_bit(READ_CAPACITY, filter->read_ok); 136 __set_bit(READ_LONG, filter->read_ok); 137 __set_bit(INQUIRY, filter->read_ok); 138 __set_bit(MODE_SENSE, filter->read_ok); 139 __set_bit(MODE_SENSE_10, filter->read_ok); 140 __set_bit(LOG_SENSE, filter->read_ok); 141 __set_bit(START_STOP, filter->read_ok); 142 __set_bit(GPCMD_VERIFY_10, filter->read_ok); 143 __set_bit(VERIFY_16, filter->read_ok); 144 __set_bit(REPORT_LUNS, filter->read_ok); 145 __set_bit(SERVICE_ACTION_IN_16, filter->read_ok); 146 __set_bit(RECEIVE_DIAGNOSTIC, filter->read_ok); 147 __set_bit(MAINTENANCE_IN, filter->read_ok); 148 __set_bit(GPCMD_READ_BUFFER_CAPACITY, filter->read_ok); 149 150 /* Audio CD commands */ 151 __set_bit(GPCMD_PLAY_CD, filter->read_ok); 152 __set_bit(GPCMD_PLAY_AUDIO_10, filter->read_ok); 153 __set_bit(GPCMD_PLAY_AUDIO_MSF, filter->read_ok); 154 __set_bit(GPCMD_PLAY_AUDIO_TI, filter->read_ok); 155 __set_bit(GPCMD_PAUSE_RESUME, filter->read_ok); 156 157 /* CD/DVD data reading */ 158 __set_bit(GPCMD_READ_CD, filter->read_ok); 159 __set_bit(GPCMD_READ_CD_MSF, filter->read_ok); 160 __set_bit(GPCMD_READ_DISC_INFO, filter->read_ok); 161 __set_bit(GPCMD_READ_CDVD_CAPACITY, filter->read_ok); 162 __set_bit(GPCMD_READ_DVD_STRUCTURE, filter->read_ok); 163 __set_bit(GPCMD_READ_HEADER, filter->read_ok); 164 __set_bit(GPCMD_READ_TRACK_RZONE_INFO, filter->read_ok); 165 __set_bit(GPCMD_READ_SUBCHANNEL, filter->read_ok); 166 __set_bit(GPCMD_READ_TOC_PMA_ATIP, filter->read_ok); 167 __set_bit(GPCMD_REPORT_KEY, filter->read_ok); 168 __set_bit(GPCMD_SCAN, filter->read_ok); 169 __set_bit(GPCMD_GET_CONFIGURATION, filter->read_ok); 170 __set_bit(GPCMD_READ_FORMAT_CAPACITIES, filter->read_ok); 171 __set_bit(GPCMD_GET_EVENT_STATUS_NOTIFICATION, filter->read_ok); 172 __set_bit(GPCMD_GET_PERFORMANCE, filter->read_ok); 173 __set_bit(GPCMD_SEEK, filter->read_ok); 174 __set_bit(GPCMD_STOP_PLAY_SCAN, filter->read_ok); 175 176 /* Basic writing commands */ 177 __set_bit(WRITE_6, filter->write_ok); 178 __set_bit(WRITE_10, filter->write_ok); 179 __set_bit(WRITE_VERIFY, filter->write_ok); 180 __set_bit(WRITE_12, filter->write_ok); 181 __set_bit(WRITE_VERIFY_12, filter->write_ok); 182 __set_bit(WRITE_16, filter->write_ok); 183 __set_bit(WRITE_LONG, filter->write_ok); 184 __set_bit(WRITE_LONG_2, filter->write_ok); 185 __set_bit(ERASE, filter->write_ok); 186 __set_bit(GPCMD_MODE_SELECT_10, filter->write_ok); 187 __set_bit(MODE_SELECT, filter->write_ok); 188 __set_bit(LOG_SELECT, filter->write_ok); 189 __set_bit(GPCMD_BLANK, filter->write_ok); 190 __set_bit(GPCMD_CLOSE_TRACK, filter->write_ok); 191 __set_bit(GPCMD_FLUSH_CACHE, filter->write_ok); 192 __set_bit(GPCMD_FORMAT_UNIT, filter->write_ok); 193 __set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok); 194 __set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok); 195 __set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok); 196 __set_bit(GPCMD_SEND_EVENT, filter->write_ok); 197 __set_bit(GPCMD_SEND_KEY, filter->write_ok); 198 __set_bit(GPCMD_SEND_OPC, filter->write_ok); 199 __set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok); 200 __set_bit(GPCMD_SET_SPEED, filter->write_ok); 201 __set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok); 202 __set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok); 203 __set_bit(GPCMD_SET_STREAMING, filter->write_ok); 204 __set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok); 205} 206 207int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm) 208{ 209 struct blk_cmd_filter *filter = &blk_default_cmd_filter; 210 211 /* root can do any command. */ 212 if (capable(CAP_SYS_RAWIO)) 213 return 0; 214 215 /* Anybody who can open the device can do a read-safe command */ 216 if (test_bit(cmd[0], filter->read_ok)) 217 return 0; 218 219 /* Write-safe commands require a writable open */ 220 if (test_bit(cmd[0], filter->write_ok) && has_write_perm) 221 return 0; 222 223 return -EPERM; 224} 225EXPORT_SYMBOL(blk_verify_command); 226 227static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq, 228 struct sg_io_hdr *hdr, fmode_t mode) 229{ 230 if (copy_from_user(rq->cmd, hdr->cmdp, hdr->cmd_len)) 231 return -EFAULT; 232 if (blk_verify_command(rq->cmd, mode & FMODE_WRITE)) 233 return -EPERM; 234 235 /* 236 * fill in request structure 237 */ 238 rq->cmd_len = hdr->cmd_len; 239 240 rq->timeout = msecs_to_jiffies(hdr->timeout); 241 if (!rq->timeout) 242 rq->timeout = q->sg_timeout; 243 if (!rq->timeout) 244 rq->timeout = BLK_DEFAULT_SG_TIMEOUT; 245 if (rq->timeout < BLK_MIN_SG_TIMEOUT) 246 rq->timeout = BLK_MIN_SG_TIMEOUT; 247 248 return 0; 249} 250 251static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr, 252 struct bio *bio) 253{ 254 int r, ret = 0; 255 256 /* 257 * fill in all the output members 258 */ 259 hdr->status = rq->errors & 0xff; 260 hdr->masked_status = status_byte(rq->errors); 261 hdr->msg_status = msg_byte(rq->errors); 262 hdr->host_status = host_byte(rq->errors); 263 hdr->driver_status = driver_byte(rq->errors); 264 hdr->info = 0; 265 if (hdr->masked_status || hdr->host_status || hdr->driver_status) 266 hdr->info |= SG_INFO_CHECK; 267 hdr->resid = rq->resid_len; 268 hdr->sb_len_wr = 0; 269 270 if (rq->sense_len && hdr->sbp) { 271 int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len); 272 273 if (!copy_to_user(hdr->sbp, rq->sense, len)) 274 hdr->sb_len_wr = len; 275 else 276 ret = -EFAULT; 277 } 278 279 r = blk_rq_unmap_user(bio); 280 if (!ret) 281 ret = r; 282 283 return ret; 284} 285 286static int sg_io(struct request_queue *q, struct gendisk *bd_disk, 287 struct sg_io_hdr *hdr, fmode_t mode) 288{ 289 unsigned long start_time; 290 ssize_t ret = 0; 291 int writing = 0; 292 int at_head = 0; 293 struct request *rq; 294 char sense[SCSI_SENSE_BUFFERSIZE]; 295 struct bio *bio; 296 297 if (hdr->interface_id != 'S') 298 return -EINVAL; 299 300 if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9)) 301 return -EIO; 302 303 if (hdr->dxfer_len) 304 switch (hdr->dxfer_direction) { 305 default: 306 return -EINVAL; 307 case SG_DXFER_TO_DEV: 308 writing = 1; 309 break; 310 case SG_DXFER_TO_FROM_DEV: 311 case SG_DXFER_FROM_DEV: 312 break; 313 } 314 if (hdr->flags & SG_FLAG_Q_AT_HEAD) 315 at_head = 1; 316 317 ret = -ENOMEM; 318 rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL); 319 if (IS_ERR(rq)) 320 return PTR_ERR(rq); 321 blk_rq_set_block_pc(rq); 322 323 if (hdr->cmd_len > BLK_MAX_CDB) { 324 rq->cmd = kzalloc(hdr->cmd_len, GFP_KERNEL); 325 if (!rq->cmd) 326 goto out_put_request; 327 } 328 329 ret = -EFAULT; 330 if (blk_fill_sghdr_rq(q, rq, hdr, mode)) 331 goto out_free_cdb; 332 333 ret = 0; 334 if (hdr->iovec_count) { 335 struct iov_iter i; 336 struct iovec *iov = NULL; 337 338 ret = import_iovec(rq_data_dir(rq), 339 hdr->dxferp, hdr->iovec_count, 340 0, &iov, &i); 341 if (ret < 0) 342 goto out_free_cdb; 343 344 /* SG_IO howto says that the shorter of the two wins */ 345 iov_iter_truncate(&i, hdr->dxfer_len); 346 347 ret = blk_rq_map_user_iov(q, rq, NULL, &i, GFP_KERNEL); 348 kfree(iov); 349 } else if (hdr->dxfer_len) 350 ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len, 351 GFP_KERNEL); 352 353 if (ret) 354 goto out_free_cdb; 355 356 bio = rq->bio; 357 memset(sense, 0, sizeof(sense)); 358 rq->sense = sense; 359 rq->sense_len = 0; 360 rq->retries = 0; 361 362 start_time = jiffies; 363 364 /* ignore return value. All information is passed back to caller 365 * (if he doesn't check that is his problem). 366 * N.B. a non-zero SCSI status is _not_ necessarily an error. 367 */ 368 blk_execute_rq(q, bd_disk, rq, at_head); 369 370 hdr->duration = jiffies_to_msecs(jiffies - start_time); 371 372 ret = blk_complete_sghdr_rq(rq, hdr, bio); 373 374out_free_cdb: 375 if (rq->cmd != rq->__cmd) 376 kfree(rq->cmd); 377out_put_request: 378 blk_put_request(rq); 379 return ret; 380} 381 382/** 383 * sg_scsi_ioctl -- handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl 384 * @file: file this ioctl operates on (optional) 385 * @q: request queue to send scsi commands down 386 * @disk: gendisk to operate on (option) 387 * @sic: userspace structure describing the command to perform 388 * 389 * Send down the scsi command described by @sic to the device below 390 * the request queue @q. If @file is non-NULL it's used to perform 391 * fine-grained permission checks that allow users to send down 392 * non-destructive SCSI commands. If the caller has a struct gendisk 393 * available it should be passed in as @disk to allow the low level 394 * driver to use the information contained in it. A non-NULL @disk 395 * is only allowed if the caller knows that the low level driver doesn't 396 * need it (e.g. in the scsi subsystem). 397 * 398 * Notes: 399 * - This interface is deprecated - users should use the SG_IO 400 * interface instead, as this is a more flexible approach to 401 * performing SCSI commands on a device. 402 * - The SCSI command length is determined by examining the 1st byte 403 * of the given command. There is no way to override this. 404 * - Data transfers are limited to PAGE_SIZE 405 * - The length (x + y) must be at least OMAX_SB_LEN bytes long to 406 * accommodate the sense buffer when an error occurs. 407 * The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that 408 * old code will not be surprised. 409 * - If a Unix error occurs (e.g. ENOMEM) then the user will receive 410 * a negative return and the Unix error code in 'errno'. 411 * If the SCSI command succeeds then 0 is returned. 412 * Positive numbers returned are the compacted SCSI error codes (4 413 * bytes in one int) where the lowest byte is the SCSI status. 414 */ 415#define OMAX_SB_LEN 16 /* For backward compatibility */ 416int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode, 417 struct scsi_ioctl_command __user *sic) 418{ 419 struct request *rq; 420 int err; 421 unsigned int in_len, out_len, bytes, opcode, cmdlen; 422 char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE]; 423 424 if (!sic) 425 return -EINVAL; 426 427 /* 428 * get in an out lengths, verify they don't exceed a page worth of data 429 */ 430 if (get_user(in_len, &sic->inlen)) 431 return -EFAULT; 432 if (get_user(out_len, &sic->outlen)) 433 return -EFAULT; 434 if (in_len > PAGE_SIZE || out_len > PAGE_SIZE) 435 return -EINVAL; 436 if (get_user(opcode, sic->data)) 437 return -EFAULT; 438 439 bytes = max(in_len, out_len); 440 if (bytes) { 441 buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN); 442 if (!buffer) 443 return -ENOMEM; 444 445 } 446 447 rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_WAIT); 448 if (IS_ERR(rq)) { 449 err = PTR_ERR(rq); 450 goto error_free_buffer; 451 } 452 blk_rq_set_block_pc(rq); 453 454 cmdlen = COMMAND_SIZE(opcode); 455 456 /* 457 * get command and data to send to device, if any 458 */ 459 err = -EFAULT; 460 rq->cmd_len = cmdlen; 461 if (copy_from_user(rq->cmd, sic->data, cmdlen)) 462 goto error; 463 464 if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len)) 465 goto error; 466 467 err = blk_verify_command(rq->cmd, mode & FMODE_WRITE); 468 if (err) 469 goto error; 470 471 /* default. possible overriden later */ 472 rq->retries = 5; 473 474 switch (opcode) { 475 case SEND_DIAGNOSTIC: 476 case FORMAT_UNIT: 477 rq->timeout = FORMAT_UNIT_TIMEOUT; 478 rq->retries = 1; 479 break; 480 case START_STOP: 481 rq->timeout = START_STOP_TIMEOUT; 482 break; 483 case MOVE_MEDIUM: 484 rq->timeout = MOVE_MEDIUM_TIMEOUT; 485 break; 486 case READ_ELEMENT_STATUS: 487 rq->timeout = READ_ELEMENT_STATUS_TIMEOUT; 488 break; 489 case READ_DEFECT_DATA: 490 rq->timeout = READ_DEFECT_DATA_TIMEOUT; 491 rq->retries = 1; 492 break; 493 default: 494 rq->timeout = BLK_DEFAULT_SG_TIMEOUT; 495 break; 496 } 497 498 if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_WAIT)) { 499 err = DRIVER_ERROR << 24; 500 goto error; 501 } 502 503 memset(sense, 0, sizeof(sense)); 504 rq->sense = sense; 505 rq->sense_len = 0; 506 507 blk_execute_rq(q, disk, rq, 0); 508 509 err = rq->errors & 0xff; /* only 8 bit SCSI status */ 510 if (err) { 511 if (rq->sense_len && rq->sense) { 512 bytes = (OMAX_SB_LEN > rq->sense_len) ? 513 rq->sense_len : OMAX_SB_LEN; 514 if (copy_to_user(sic->data, rq->sense, bytes)) 515 err = -EFAULT; 516 } 517 } else { 518 if (copy_to_user(sic->data, buffer, out_len)) 519 err = -EFAULT; 520 } 521 522error: 523 blk_put_request(rq); 524 525error_free_buffer: 526 kfree(buffer); 527 528 return err; 529} 530EXPORT_SYMBOL_GPL(sg_scsi_ioctl); 531 532/* Send basic block requests */ 533static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk, 534 int cmd, int data) 535{ 536 struct request *rq; 537 int err; 538 539 rq = blk_get_request(q, WRITE, __GFP_WAIT); 540 if (IS_ERR(rq)) 541 return PTR_ERR(rq); 542 blk_rq_set_block_pc(rq); 543 rq->timeout = BLK_DEFAULT_SG_TIMEOUT; 544 rq->cmd[0] = cmd; 545 rq->cmd[4] = data; 546 rq->cmd_len = 6; 547 err = blk_execute_rq(q, bd_disk, rq, 0); 548 blk_put_request(rq); 549 550 return err; 551} 552 553static inline int blk_send_start_stop(struct request_queue *q, 554 struct gendisk *bd_disk, int data) 555{ 556 return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data); 557} 558 559int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode, 560 unsigned int cmd, void __user *arg) 561{ 562 int err; 563 564 if (!q) 565 return -ENXIO; 566 567 switch (cmd) { 568 /* 569 * new sgv3 interface 570 */ 571 case SG_GET_VERSION_NUM: 572 err = sg_get_version(arg); 573 break; 574 case SCSI_IOCTL_GET_IDLUN: 575 err = scsi_get_idlun(q, arg); 576 break; 577 case SCSI_IOCTL_GET_BUS_NUMBER: 578 err = scsi_get_bus(q, arg); 579 break; 580 case SG_SET_TIMEOUT: 581 err = sg_set_timeout(q, arg); 582 break; 583 case SG_GET_TIMEOUT: 584 err = sg_get_timeout(q); 585 break; 586 case SG_GET_RESERVED_SIZE: 587 err = sg_get_reserved_size(q, arg); 588 break; 589 case SG_SET_RESERVED_SIZE: 590 err = sg_set_reserved_size(q, arg); 591 break; 592 case SG_EMULATED_HOST: 593 err = sg_emulated_host(q, arg); 594 break; 595 case SG_IO: { 596 struct sg_io_hdr hdr; 597 598 err = -EFAULT; 599 if (copy_from_user(&hdr, arg, sizeof(hdr))) 600 break; 601 err = sg_io(q, bd_disk, &hdr, mode); 602 if (err == -EFAULT) 603 break; 604 605 if (copy_to_user(arg, &hdr, sizeof(hdr))) 606 err = -EFAULT; 607 break; 608 } 609 case CDROM_SEND_PACKET: { 610 struct cdrom_generic_command cgc; 611 struct sg_io_hdr hdr; 612 613 err = -EFAULT; 614 if (copy_from_user(&cgc, arg, sizeof(cgc))) 615 break; 616 cgc.timeout = clock_t_to_jiffies(cgc.timeout); 617 memset(&hdr, 0, sizeof(hdr)); 618 hdr.interface_id = 'S'; 619 hdr.cmd_len = sizeof(cgc.cmd); 620 hdr.dxfer_len = cgc.buflen; 621 err = 0; 622 switch (cgc.data_direction) { 623 case CGC_DATA_UNKNOWN: 624 hdr.dxfer_direction = SG_DXFER_UNKNOWN; 625 break; 626 case CGC_DATA_WRITE: 627 hdr.dxfer_direction = SG_DXFER_TO_DEV; 628 break; 629 case CGC_DATA_READ: 630 hdr.dxfer_direction = SG_DXFER_FROM_DEV; 631 break; 632 case CGC_DATA_NONE: 633 hdr.dxfer_direction = SG_DXFER_NONE; 634 break; 635 default: 636 err = -EINVAL; 637 } 638 if (err) 639 break; 640 641 hdr.dxferp = cgc.buffer; 642 hdr.sbp = cgc.sense; 643 if (hdr.sbp) 644 hdr.mx_sb_len = sizeof(struct request_sense); 645 hdr.timeout = jiffies_to_msecs(cgc.timeout); 646 hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd; 647 hdr.cmd_len = sizeof(cgc.cmd); 648 649 err = sg_io(q, bd_disk, &hdr, mode); 650 if (err == -EFAULT) 651 break; 652 653 if (hdr.status) 654 err = -EIO; 655 656 cgc.stat = err; 657 cgc.buflen = hdr.resid; 658 if (copy_to_user(arg, &cgc, sizeof(cgc))) 659 err = -EFAULT; 660 661 break; 662 } 663 664 /* 665 * old junk scsi send command ioctl 666 */ 667 case SCSI_IOCTL_SEND_COMMAND: 668 printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm); 669 err = -EINVAL; 670 if (!arg) 671 break; 672 673 err = sg_scsi_ioctl(q, bd_disk, mode, arg); 674 break; 675 case CDROMCLOSETRAY: 676 err = blk_send_start_stop(q, bd_disk, 0x03); 677 break; 678 case CDROMEJECT: 679 err = blk_send_start_stop(q, bd_disk, 0x02); 680 break; 681 default: 682 err = -ENOTTY; 683 } 684 685 return err; 686} 687EXPORT_SYMBOL(scsi_cmd_ioctl); 688 689int scsi_verify_blk_ioctl(struct block_device *bd, unsigned int cmd) 690{ 691 if (bd && bd == bd->bd_contains) 692 return 0; 693 694 /* Actually none of these is particularly useful on a partition, 695 * but they are safe. 696 */ 697 switch (cmd) { 698 case SCSI_IOCTL_GET_IDLUN: 699 case SCSI_IOCTL_GET_BUS_NUMBER: 700 case SCSI_IOCTL_GET_PCI: 701 case SCSI_IOCTL_PROBE_HOST: 702 case SG_GET_VERSION_NUM: 703 case SG_SET_TIMEOUT: 704 case SG_GET_TIMEOUT: 705 case SG_GET_RESERVED_SIZE: 706 case SG_SET_RESERVED_SIZE: 707 case SG_EMULATED_HOST: 708 return 0; 709 case CDROM_GET_CAPABILITY: 710 /* Keep this until we remove the printk below. udev sends it 711 * and we do not want to spam dmesg about it. CD-ROMs do 712 * not have partitions, so we get here only for disks. 713 */ 714 return -ENOIOCTLCMD; 715 default: 716 break; 717 } 718 719 if (capable(CAP_SYS_RAWIO)) 720 return 0; 721 722 /* In particular, rule out all resets and host-specific ioctls. */ 723 printk_ratelimited(KERN_WARNING 724 "%s: sending ioctl %x to a partition!\n", current->comm, cmd); 725 726 return -ENOIOCTLCMD; 727} 728EXPORT_SYMBOL(scsi_verify_blk_ioctl); 729 730int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode, 731 unsigned int cmd, void __user *arg) 732{ 733 int ret; 734 735 ret = scsi_verify_blk_ioctl(bd, cmd); 736 if (ret < 0) 737 return ret; 738 739 return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg); 740} 741EXPORT_SYMBOL(scsi_cmd_blk_ioctl); 742 743static int __init blk_scsi_ioctl_init(void) 744{ 745 blk_set_cmd_filter_defaults(&blk_default_cmd_filter); 746 return 0; 747} 748fs_initcall(blk_scsi_ioctl_init); 749