1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/capability.h> 3 #include <linux/compat.h> 4 #include <linux/blkdev.h> 5 #include <linux/export.h> 6 #include <linux/gfp.h> 7 #include <linux/blkpg.h> 8 #include <linux/hdreg.h> 9 #include <linux/backing-dev.h> 10 #include <linux/fs.h> 11 #include <linux/blktrace_api.h> 12 #include <linux/pr.h> 13 #include <linux/uaccess.h> 14 #include "blk.h" 15 16 static int blkpg_do_ioctl(struct block_device *bdev, 17 struct blkpg_partition __user *upart, int op) 18 { 19 struct gendisk *disk = bdev->bd_disk; 20 struct blkpg_partition p; 21 long long start, length; 22 23 if (!capable(CAP_SYS_ADMIN)) 24 return -EACCES; 25 if (copy_from_user(&p, upart, sizeof(struct blkpg_partition))) 26 return -EFAULT; 27 if (bdev_is_partition(bdev)) 28 return -EINVAL; 29 30 if (p.pno <= 0) 31 return -EINVAL; 32 33 if (op == BLKPG_DEL_PARTITION) 34 return bdev_del_partition(disk, p.pno); 35 36 start = p.start >> SECTOR_SHIFT; 37 length = p.length >> SECTOR_SHIFT; 38 39 switch (op) { 40 case BLKPG_ADD_PARTITION: 41 /* check if partition is aligned to blocksize */ 42 if (p.start & (bdev_logical_block_size(bdev) - 1)) 43 return -EINVAL; 44 return bdev_add_partition(disk, p.pno, start, length); 45 case BLKPG_RESIZE_PARTITION: 46 return bdev_resize_partition(disk, p.pno, start, length); 47 default: 48 return -EINVAL; 49 } 50 } 51 52 static int blkpg_ioctl(struct block_device *bdev, 53 struct blkpg_ioctl_arg __user *arg) 54 { 55 struct blkpg_partition __user *udata; 56 int op; 57 58 if (get_user(op, &arg->op) || get_user(udata, &arg->data)) 59 return -EFAULT; 60 61 return blkpg_do_ioctl(bdev, udata, op); 62 } 63 64 #ifdef CONFIG_COMPAT 65 struct compat_blkpg_ioctl_arg { 66 compat_int_t op; 67 compat_int_t flags; 68 compat_int_t datalen; 69 compat_caddr_t data; 70 }; 71 72 static int compat_blkpg_ioctl(struct block_device *bdev, 73 struct compat_blkpg_ioctl_arg __user *arg) 74 { 75 compat_caddr_t udata; 76 int op; 77 78 if (get_user(op, &arg->op) || get_user(udata, &arg->data)) 79 return -EFAULT; 80 81 return blkpg_do_ioctl(bdev, compat_ptr(udata), op); 82 } 83 #endif 84 85 static int blk_ioctl_discard(struct block_device *bdev, blk_mode_t mode, 86 unsigned long arg) 87 { 88 uint64_t range[2]; 89 uint64_t start, len; 90 struct inode *inode = bdev->bd_inode; 91 int err; 92 93 if (!(mode & BLK_OPEN_WRITE)) 94 return -EBADF; 95 96 if (!bdev_max_discard_sectors(bdev)) 97 return -EOPNOTSUPP; 98 99 if (copy_from_user(range, (void __user *)arg, sizeof(range))) 100 return -EFAULT; 101 102 start = range[0]; 103 len = range[1]; 104 105 if (start & 511) 106 return -EINVAL; 107 if (len & 511) 108 return -EINVAL; 109 110 if (start + len > bdev_nr_bytes(bdev)) 111 return -EINVAL; 112 113 filemap_invalidate_lock(inode->i_mapping); 114 err = truncate_bdev_range(bdev, mode, start, start + len - 1); 115 if (err) 116 goto fail; 117 err = blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_KERNEL); 118 fail: 119 filemap_invalidate_unlock(inode->i_mapping); 120 return err; 121 } 122 123 static int blk_ioctl_secure_erase(struct block_device *bdev, blk_mode_t mode, 124 void __user *argp) 125 { 126 uint64_t start, len; 127 uint64_t range[2]; 128 int err; 129 130 if (!(mode & BLK_OPEN_WRITE)) 131 return -EBADF; 132 if (!bdev_max_secure_erase_sectors(bdev)) 133 return -EOPNOTSUPP; 134 if (copy_from_user(range, argp, sizeof(range))) 135 return -EFAULT; 136 137 start = range[0]; 138 len = range[1]; 139 if ((start & 511) || (len & 511)) 140 return -EINVAL; 141 if (start + len > bdev_nr_bytes(bdev)) 142 return -EINVAL; 143 144 filemap_invalidate_lock(bdev->bd_inode->i_mapping); 145 err = truncate_bdev_range(bdev, mode, start, start + len - 1); 146 if (!err) 147 err = blkdev_issue_secure_erase(bdev, start >> 9, len >> 9, 148 GFP_KERNEL); 149 filemap_invalidate_unlock(bdev->bd_inode->i_mapping); 150 return err; 151 } 152 153 154 static int blk_ioctl_zeroout(struct block_device *bdev, blk_mode_t mode, 155 unsigned long arg) 156 { 157 uint64_t range[2]; 158 uint64_t start, end, len; 159 struct inode *inode = bdev->bd_inode; 160 int err; 161 162 if (!(mode & BLK_OPEN_WRITE)) 163 return -EBADF; 164 165 if (copy_from_user(range, (void __user *)arg, sizeof(range))) 166 return -EFAULT; 167 168 start = range[0]; 169 len = range[1]; 170 end = start + len - 1; 171 172 if (start & 511) 173 return -EINVAL; 174 if (len & 511) 175 return -EINVAL; 176 if (end >= (uint64_t)bdev_nr_bytes(bdev)) 177 return -EINVAL; 178 if (end < start) 179 return -EINVAL; 180 181 /* Invalidate the page cache, including dirty pages */ 182 filemap_invalidate_lock(inode->i_mapping); 183 err = truncate_bdev_range(bdev, mode, start, end); 184 if (err) 185 goto fail; 186 187 err = blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL, 188 BLKDEV_ZERO_NOUNMAP); 189 190 fail: 191 filemap_invalidate_unlock(inode->i_mapping); 192 return err; 193 } 194 195 static int put_ushort(unsigned short __user *argp, unsigned short val) 196 { 197 return put_user(val, argp); 198 } 199 200 static int put_int(int __user *argp, int val) 201 { 202 return put_user(val, argp); 203 } 204 205 static int put_uint(unsigned int __user *argp, unsigned int val) 206 { 207 return put_user(val, argp); 208 } 209 210 static int put_long(long __user *argp, long val) 211 { 212 return put_user(val, argp); 213 } 214 215 static int put_ulong(unsigned long __user *argp, unsigned long val) 216 { 217 return put_user(val, argp); 218 } 219 220 static int put_u64(u64 __user *argp, u64 val) 221 { 222 return put_user(val, argp); 223 } 224 225 #ifdef CONFIG_COMPAT 226 static int compat_put_long(compat_long_t __user *argp, long val) 227 { 228 return put_user(val, argp); 229 } 230 231 static int compat_put_ulong(compat_ulong_t __user *argp, compat_ulong_t val) 232 { 233 return put_user(val, argp); 234 } 235 #endif 236 237 #ifdef CONFIG_COMPAT 238 /* 239 * This is the equivalent of compat_ptr_ioctl(), to be used by block 240 * drivers that implement only commands that are completely compatible 241 * between 32-bit and 64-bit user space 242 */ 243 int blkdev_compat_ptr_ioctl(struct block_device *bdev, blk_mode_t mode, 244 unsigned cmd, unsigned long arg) 245 { 246 struct gendisk *disk = bdev->bd_disk; 247 248 if (disk->fops->ioctl) 249 return disk->fops->ioctl(bdev, mode, cmd, 250 (unsigned long)compat_ptr(arg)); 251 252 return -ENOIOCTLCMD; 253 } 254 EXPORT_SYMBOL(blkdev_compat_ptr_ioctl); 255 #endif 256 257 static bool blkdev_pr_allowed(struct block_device *bdev, blk_mode_t mode) 258 { 259 /* no sense to make reservations for partitions */ 260 if (bdev_is_partition(bdev)) 261 return false; 262 263 if (capable(CAP_SYS_ADMIN)) 264 return true; 265 /* 266 * Only allow unprivileged reservations if the file descriptor is open 267 * for writing. 268 */ 269 return mode & BLK_OPEN_WRITE; 270 } 271 272 static int blkdev_pr_register(struct block_device *bdev, blk_mode_t mode, 273 struct pr_registration __user *arg) 274 { 275 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; 276 struct pr_registration reg; 277 278 if (!blkdev_pr_allowed(bdev, mode)) 279 return -EPERM; 280 if (!ops || !ops->pr_register) 281 return -EOPNOTSUPP; 282 if (copy_from_user(®, arg, sizeof(reg))) 283 return -EFAULT; 284 285 if (reg.flags & ~PR_FL_IGNORE_KEY) 286 return -EOPNOTSUPP; 287 return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags); 288 } 289 290 static int blkdev_pr_reserve(struct block_device *bdev, blk_mode_t mode, 291 struct pr_reservation __user *arg) 292 { 293 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; 294 struct pr_reservation rsv; 295 296 if (!blkdev_pr_allowed(bdev, mode)) 297 return -EPERM; 298 if (!ops || !ops->pr_reserve) 299 return -EOPNOTSUPP; 300 if (copy_from_user(&rsv, arg, sizeof(rsv))) 301 return -EFAULT; 302 303 if (rsv.flags & ~PR_FL_IGNORE_KEY) 304 return -EOPNOTSUPP; 305 return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags); 306 } 307 308 static int blkdev_pr_release(struct block_device *bdev, blk_mode_t mode, 309 struct pr_reservation __user *arg) 310 { 311 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; 312 struct pr_reservation rsv; 313 314 if (!blkdev_pr_allowed(bdev, mode)) 315 return -EPERM; 316 if (!ops || !ops->pr_release) 317 return -EOPNOTSUPP; 318 if (copy_from_user(&rsv, arg, sizeof(rsv))) 319 return -EFAULT; 320 321 if (rsv.flags) 322 return -EOPNOTSUPP; 323 return ops->pr_release(bdev, rsv.key, rsv.type); 324 } 325 326 static int blkdev_pr_preempt(struct block_device *bdev, blk_mode_t mode, 327 struct pr_preempt __user *arg, bool abort) 328 { 329 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; 330 struct pr_preempt p; 331 332 if (!blkdev_pr_allowed(bdev, mode)) 333 return -EPERM; 334 if (!ops || !ops->pr_preempt) 335 return -EOPNOTSUPP; 336 if (copy_from_user(&p, arg, sizeof(p))) 337 return -EFAULT; 338 339 if (p.flags) 340 return -EOPNOTSUPP; 341 return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort); 342 } 343 344 static int blkdev_pr_clear(struct block_device *bdev, blk_mode_t mode, 345 struct pr_clear __user *arg) 346 { 347 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; 348 struct pr_clear c; 349 350 if (!blkdev_pr_allowed(bdev, mode)) 351 return -EPERM; 352 if (!ops || !ops->pr_clear) 353 return -EOPNOTSUPP; 354 if (copy_from_user(&c, arg, sizeof(c))) 355 return -EFAULT; 356 357 if (c.flags) 358 return -EOPNOTSUPP; 359 return ops->pr_clear(bdev, c.key); 360 } 361 362 static int blkdev_flushbuf(struct block_device *bdev, unsigned cmd, 363 unsigned long arg) 364 { 365 if (!capable(CAP_SYS_ADMIN)) 366 return -EACCES; 367 fsync_bdev(bdev); 368 invalidate_bdev(bdev); 369 return 0; 370 } 371 372 static int blkdev_roset(struct block_device *bdev, unsigned cmd, 373 unsigned long arg) 374 { 375 int ret, n; 376 377 if (!capable(CAP_SYS_ADMIN)) 378 return -EACCES; 379 380 if (get_user(n, (int __user *)arg)) 381 return -EFAULT; 382 if (bdev->bd_disk->fops->set_read_only) { 383 ret = bdev->bd_disk->fops->set_read_only(bdev, n); 384 if (ret) 385 return ret; 386 } 387 bdev->bd_read_only = n; 388 return 0; 389 } 390 391 static int blkdev_getgeo(struct block_device *bdev, 392 struct hd_geometry __user *argp) 393 { 394 struct gendisk *disk = bdev->bd_disk; 395 struct hd_geometry geo; 396 int ret; 397 398 if (!argp) 399 return -EINVAL; 400 if (!disk->fops->getgeo) 401 return -ENOTTY; 402 403 /* 404 * We need to set the startsect first, the driver may 405 * want to override it. 406 */ 407 memset(&geo, 0, sizeof(geo)); 408 geo.start = get_start_sect(bdev); 409 ret = disk->fops->getgeo(bdev, &geo); 410 if (ret) 411 return ret; 412 if (copy_to_user(argp, &geo, sizeof(geo))) 413 return -EFAULT; 414 return 0; 415 } 416 417 #ifdef CONFIG_COMPAT 418 struct compat_hd_geometry { 419 unsigned char heads; 420 unsigned char sectors; 421 unsigned short cylinders; 422 u32 start; 423 }; 424 425 static int compat_hdio_getgeo(struct block_device *bdev, 426 struct compat_hd_geometry __user *ugeo) 427 { 428 struct gendisk *disk = bdev->bd_disk; 429 struct hd_geometry geo; 430 int ret; 431 432 if (!ugeo) 433 return -EINVAL; 434 if (!disk->fops->getgeo) 435 return -ENOTTY; 436 437 memset(&geo, 0, sizeof(geo)); 438 /* 439 * We need to set the startsect first, the driver may 440 * want to override it. 441 */ 442 geo.start = get_start_sect(bdev); 443 ret = disk->fops->getgeo(bdev, &geo); 444 if (ret) 445 return ret; 446 447 ret = copy_to_user(ugeo, &geo, 4); 448 ret |= put_user(geo.start, &ugeo->start); 449 if (ret) 450 ret = -EFAULT; 451 452 return ret; 453 } 454 #endif 455 456 /* set the logical block size */ 457 static int blkdev_bszset(struct block_device *bdev, blk_mode_t mode, 458 int __user *argp) 459 { 460 int ret, n; 461 462 if (!capable(CAP_SYS_ADMIN)) 463 return -EACCES; 464 if (!argp) 465 return -EINVAL; 466 if (get_user(n, argp)) 467 return -EFAULT; 468 469 if (mode & BLK_OPEN_EXCL) 470 return set_blocksize(bdev, n); 471 472 if (IS_ERR(blkdev_get_by_dev(bdev->bd_dev, mode, &bdev, NULL))) 473 return -EBUSY; 474 ret = set_blocksize(bdev, n); 475 blkdev_put(bdev, &bdev); 476 477 return ret; 478 } 479 480 /* 481 * Common commands that are handled the same way on native and compat 482 * user space. Note the separate arg/argp parameters that are needed 483 * to deal with the compat_ptr() conversion. 484 */ 485 static int blkdev_common_ioctl(struct block_device *bdev, blk_mode_t mode, 486 unsigned int cmd, unsigned long arg, 487 void __user *argp) 488 { 489 unsigned int max_sectors; 490 491 switch (cmd) { 492 case BLKFLSBUF: 493 return blkdev_flushbuf(bdev, cmd, arg); 494 case BLKROSET: 495 return blkdev_roset(bdev, cmd, arg); 496 case BLKDISCARD: 497 return blk_ioctl_discard(bdev, mode, arg); 498 case BLKSECDISCARD: 499 return blk_ioctl_secure_erase(bdev, mode, argp); 500 case BLKZEROOUT: 501 return blk_ioctl_zeroout(bdev, mode, arg); 502 case BLKGETDISKSEQ: 503 return put_u64(argp, bdev->bd_disk->diskseq); 504 case BLKREPORTZONE: 505 return blkdev_report_zones_ioctl(bdev, cmd, arg); 506 case BLKRESETZONE: 507 case BLKOPENZONE: 508 case BLKCLOSEZONE: 509 case BLKFINISHZONE: 510 return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg); 511 case BLKGETZONESZ: 512 return put_uint(argp, bdev_zone_sectors(bdev)); 513 case BLKGETNRZONES: 514 return put_uint(argp, bdev_nr_zones(bdev)); 515 case BLKROGET: 516 return put_int(argp, bdev_read_only(bdev) != 0); 517 case BLKSSZGET: /* get block device logical block size */ 518 return put_int(argp, bdev_logical_block_size(bdev)); 519 case BLKPBSZGET: /* get block device physical block size */ 520 return put_uint(argp, bdev_physical_block_size(bdev)); 521 case BLKIOMIN: 522 return put_uint(argp, bdev_io_min(bdev)); 523 case BLKIOOPT: 524 return put_uint(argp, bdev_io_opt(bdev)); 525 case BLKALIGNOFF: 526 return put_int(argp, bdev_alignment_offset(bdev)); 527 case BLKDISCARDZEROES: 528 return put_uint(argp, 0); 529 case BLKSECTGET: 530 max_sectors = min_t(unsigned int, USHRT_MAX, 531 queue_max_sectors(bdev_get_queue(bdev))); 532 return put_ushort(argp, max_sectors); 533 case BLKROTATIONAL: 534 return put_ushort(argp, !bdev_nonrot(bdev)); 535 case BLKRASET: 536 case BLKFRASET: 537 if(!capable(CAP_SYS_ADMIN)) 538 return -EACCES; 539 bdev->bd_disk->bdi->ra_pages = (arg * 512) / PAGE_SIZE; 540 return 0; 541 case BLKRRPART: 542 if (!capable(CAP_SYS_ADMIN)) 543 return -EACCES; 544 if (bdev_is_partition(bdev)) 545 return -EINVAL; 546 return disk_scan_partitions(bdev->bd_disk, mode); 547 case BLKTRACESTART: 548 case BLKTRACESTOP: 549 case BLKTRACETEARDOWN: 550 return blk_trace_ioctl(bdev, cmd, argp); 551 case IOC_PR_REGISTER: 552 return blkdev_pr_register(bdev, mode, argp); 553 case IOC_PR_RESERVE: 554 return blkdev_pr_reserve(bdev, mode, argp); 555 case IOC_PR_RELEASE: 556 return blkdev_pr_release(bdev, mode, argp); 557 case IOC_PR_PREEMPT: 558 return blkdev_pr_preempt(bdev, mode, argp, false); 559 case IOC_PR_PREEMPT_ABORT: 560 return blkdev_pr_preempt(bdev, mode, argp, true); 561 case IOC_PR_CLEAR: 562 return blkdev_pr_clear(bdev, mode, argp); 563 default: 564 return -ENOIOCTLCMD; 565 } 566 } 567 568 /* 569 * Always keep this in sync with compat_blkdev_ioctl() 570 * to handle all incompatible commands in both functions. 571 * 572 * New commands must be compatible and go into blkdev_common_ioctl 573 */ 574 long blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg) 575 { 576 struct block_device *bdev = I_BDEV(file->f_mapping->host); 577 void __user *argp = (void __user *)arg; 578 blk_mode_t mode = file_to_blk_mode(file); 579 int ret; 580 581 switch (cmd) { 582 /* These need separate implementations for the data structure */ 583 case HDIO_GETGEO: 584 return blkdev_getgeo(bdev, argp); 585 case BLKPG: 586 return blkpg_ioctl(bdev, argp); 587 588 /* Compat mode returns 32-bit data instead of 'long' */ 589 case BLKRAGET: 590 case BLKFRAGET: 591 if (!argp) 592 return -EINVAL; 593 return put_long(argp, 594 (bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512); 595 case BLKGETSIZE: 596 if (bdev_nr_sectors(bdev) > ~0UL) 597 return -EFBIG; 598 return put_ulong(argp, bdev_nr_sectors(bdev)); 599 600 /* The data is compatible, but the command number is different */ 601 case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */ 602 return put_int(argp, block_size(bdev)); 603 case BLKBSZSET: 604 return blkdev_bszset(bdev, mode, argp); 605 case BLKGETSIZE64: 606 return put_u64(argp, bdev_nr_bytes(bdev)); 607 608 /* Incompatible alignment on i386 */ 609 case BLKTRACESETUP: 610 return blk_trace_ioctl(bdev, cmd, argp); 611 default: 612 break; 613 } 614 615 ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp); 616 if (ret != -ENOIOCTLCMD) 617 return ret; 618 619 if (!bdev->bd_disk->fops->ioctl) 620 return -ENOTTY; 621 return bdev->bd_disk->fops->ioctl(bdev, mode, cmd, arg); 622 } 623 624 #ifdef CONFIG_COMPAT 625 626 #define BLKBSZGET_32 _IOR(0x12, 112, int) 627 #define BLKBSZSET_32 _IOW(0x12, 113, int) 628 #define BLKGETSIZE64_32 _IOR(0x12, 114, int) 629 630 /* Most of the generic ioctls are handled in the normal fallback path. 631 This assumes the blkdev's low level compat_ioctl always returns 632 ENOIOCTLCMD for unknown ioctls. */ 633 long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg) 634 { 635 int ret; 636 void __user *argp = compat_ptr(arg); 637 struct block_device *bdev = I_BDEV(file->f_mapping->host); 638 struct gendisk *disk = bdev->bd_disk; 639 blk_mode_t mode = file_to_blk_mode(file); 640 641 switch (cmd) { 642 /* These need separate implementations for the data structure */ 643 case HDIO_GETGEO: 644 return compat_hdio_getgeo(bdev, argp); 645 case BLKPG: 646 return compat_blkpg_ioctl(bdev, argp); 647 648 /* Compat mode returns 32-bit data instead of 'long' */ 649 case BLKRAGET: 650 case BLKFRAGET: 651 if (!argp) 652 return -EINVAL; 653 return compat_put_long(argp, 654 (bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512); 655 case BLKGETSIZE: 656 if (bdev_nr_sectors(bdev) > ~(compat_ulong_t)0) 657 return -EFBIG; 658 return compat_put_ulong(argp, bdev_nr_sectors(bdev)); 659 660 /* The data is compatible, but the command number is different */ 661 case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */ 662 return put_int(argp, bdev_logical_block_size(bdev)); 663 case BLKBSZSET_32: 664 return blkdev_bszset(bdev, mode, argp); 665 case BLKGETSIZE64_32: 666 return put_u64(argp, bdev_nr_bytes(bdev)); 667 668 /* Incompatible alignment on i386 */ 669 case BLKTRACESETUP32: 670 return blk_trace_ioctl(bdev, cmd, argp); 671 default: 672 break; 673 } 674 675 ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp); 676 if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl) 677 ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg); 678 679 return ret; 680 } 681 #endif 682