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 16static 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 sector_t start, length, capacity, end; 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 if (p.start < 0 || p.length <= 0 || p.start + p.length < 0) 37 return -EINVAL; 38 /* Check that the partition is aligned to the block size */ 39 if (!IS_ALIGNED(p.start | p.length, bdev_logical_block_size(bdev))) 40 return -EINVAL; 41 42 start = p.start >> SECTOR_SHIFT; 43 length = p.length >> SECTOR_SHIFT; 44 capacity = get_capacity(disk); 45 46 if (check_add_overflow(start, length, &end)) 47 return -EINVAL; 48 49 if (start >= capacity || end > capacity) 50 return -EINVAL; 51 52 switch (op) { 53 case BLKPG_ADD_PARTITION: 54 return bdev_add_partition(disk, p.pno, start, length); 55 case BLKPG_RESIZE_PARTITION: 56 return bdev_resize_partition(disk, p.pno, start, length); 57 default: 58 return -EINVAL; 59 } 60} 61 62static int blkpg_ioctl(struct block_device *bdev, 63 struct blkpg_ioctl_arg __user *arg) 64{ 65 struct blkpg_partition __user *udata; 66 int op; 67 68 if (get_user(op, &arg->op) || get_user(udata, &arg->data)) 69 return -EFAULT; 70 71 return blkpg_do_ioctl(bdev, udata, op); 72} 73 74#ifdef CONFIG_COMPAT 75struct compat_blkpg_ioctl_arg { 76 compat_int_t op; 77 compat_int_t flags; 78 compat_int_t datalen; 79 compat_caddr_t data; 80}; 81 82static int compat_blkpg_ioctl(struct block_device *bdev, 83 struct compat_blkpg_ioctl_arg __user *arg) 84{ 85 compat_caddr_t udata; 86 int op; 87 88 if (get_user(op, &arg->op) || get_user(udata, &arg->data)) 89 return -EFAULT; 90 91 return blkpg_do_ioctl(bdev, compat_ptr(udata), op); 92} 93#endif 94 95static int blk_ioctl_discard(struct block_device *bdev, blk_mode_t mode, 96 unsigned long arg) 97{ 98 uint64_t range[2]; 99 uint64_t start, len, end; 100 struct inode *inode = bdev->bd_inode; 101 int err; 102 103 if (!(mode & BLK_OPEN_WRITE)) 104 return -EBADF; 105 106 if (!bdev_max_discard_sectors(bdev)) 107 return -EOPNOTSUPP; 108 109 if (copy_from_user(range, (void __user *)arg, sizeof(range))) 110 return -EFAULT; 111 112 start = range[0]; 113 len = range[1]; 114 115 if (start & 511) 116 return -EINVAL; 117 if (len & 511) 118 return -EINVAL; 119 120 if (check_add_overflow(start, len, &end) || 121 end > bdev_nr_bytes(bdev)) 122 return -EINVAL; 123 124 filemap_invalidate_lock(inode->i_mapping); 125 err = truncate_bdev_range(bdev, mode, start, start + len - 1); 126 if (err) 127 goto fail; 128 err = blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_KERNEL); 129fail: 130 filemap_invalidate_unlock(inode->i_mapping); 131 return err; 132} 133 134static int blk_ioctl_secure_erase(struct block_device *bdev, blk_mode_t mode, 135 void __user *argp) 136{ 137 uint64_t start, len; 138 uint64_t range[2]; 139 int err; 140 141 if (!(mode & BLK_OPEN_WRITE)) 142 return -EBADF; 143 if (!bdev_max_secure_erase_sectors(bdev)) 144 return -EOPNOTSUPP; 145 if (copy_from_user(range, argp, sizeof(range))) 146 return -EFAULT; 147 148 start = range[0]; 149 len = range[1]; 150 if ((start & 511) || (len & 511)) 151 return -EINVAL; 152 if (start + len > bdev_nr_bytes(bdev)) 153 return -EINVAL; 154 155 filemap_invalidate_lock(bdev->bd_inode->i_mapping); 156 err = truncate_bdev_range(bdev, mode, start, start + len - 1); 157 if (!err) 158 err = blkdev_issue_secure_erase(bdev, start >> 9, len >> 9, 159 GFP_KERNEL); 160 filemap_invalidate_unlock(bdev->bd_inode->i_mapping); 161 return err; 162} 163 164 165static int blk_ioctl_zeroout(struct block_device *bdev, blk_mode_t mode, 166 unsigned long arg) 167{ 168 uint64_t range[2]; 169 uint64_t start, end, len; 170 struct inode *inode = bdev->bd_inode; 171 int err; 172 173 if (!(mode & BLK_OPEN_WRITE)) 174 return -EBADF; 175 176 if (copy_from_user(range, (void __user *)arg, sizeof(range))) 177 return -EFAULT; 178 179 start = range[0]; 180 len = range[1]; 181 end = start + len - 1; 182 183 if (start & 511) 184 return -EINVAL; 185 if (len & 511) 186 return -EINVAL; 187 if (end >= (uint64_t)bdev_nr_bytes(bdev)) 188 return -EINVAL; 189 if (end < start) 190 return -EINVAL; 191 192 /* Invalidate the page cache, including dirty pages */ 193 filemap_invalidate_lock(inode->i_mapping); 194 err = truncate_bdev_range(bdev, mode, start, end); 195 if (err) 196 goto fail; 197 198 err = blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL, 199 BLKDEV_ZERO_NOUNMAP); 200 201fail: 202 filemap_invalidate_unlock(inode->i_mapping); 203 return err; 204} 205 206static int put_ushort(unsigned short __user *argp, unsigned short val) 207{ 208 return put_user(val, argp); 209} 210 211static int put_int(int __user *argp, int val) 212{ 213 return put_user(val, argp); 214} 215 216static int put_uint(unsigned int __user *argp, unsigned int val) 217{ 218 return put_user(val, argp); 219} 220 221static int put_long(long __user *argp, long val) 222{ 223 return put_user(val, argp); 224} 225 226static int put_ulong(unsigned long __user *argp, unsigned long val) 227{ 228 return put_user(val, argp); 229} 230 231static int put_u64(u64 __user *argp, u64 val) 232{ 233 return put_user(val, argp); 234} 235 236#ifdef CONFIG_COMPAT 237static int compat_put_long(compat_long_t __user *argp, long val) 238{ 239 return put_user(val, argp); 240} 241 242static int compat_put_ulong(compat_ulong_t __user *argp, compat_ulong_t val) 243{ 244 return put_user(val, argp); 245} 246#endif 247 248#ifdef CONFIG_COMPAT 249/* 250 * This is the equivalent of compat_ptr_ioctl(), to be used by block 251 * drivers that implement only commands that are completely compatible 252 * between 32-bit and 64-bit user space 253 */ 254int blkdev_compat_ptr_ioctl(struct block_device *bdev, blk_mode_t mode, 255 unsigned cmd, unsigned long arg) 256{ 257 struct gendisk *disk = bdev->bd_disk; 258 259 if (disk->fops->ioctl) 260 return disk->fops->ioctl(bdev, mode, cmd, 261 (unsigned long)compat_ptr(arg)); 262 263 return -ENOIOCTLCMD; 264} 265EXPORT_SYMBOL(blkdev_compat_ptr_ioctl); 266#endif 267 268static bool blkdev_pr_allowed(struct block_device *bdev, blk_mode_t mode) 269{ 270 /* no sense to make reservations for partitions */ 271 if (bdev_is_partition(bdev)) 272 return false; 273 274 if (capable(CAP_SYS_ADMIN)) 275 return true; 276 /* 277 * Only allow unprivileged reservations if the file descriptor is open 278 * for writing. 279 */ 280 return mode & BLK_OPEN_WRITE; 281} 282 283static int blkdev_pr_register(struct block_device *bdev, blk_mode_t mode, 284 struct pr_registration __user *arg) 285{ 286 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; 287 struct pr_registration reg; 288 289 if (!blkdev_pr_allowed(bdev, mode)) 290 return -EPERM; 291 if (!ops || !ops->pr_register) 292 return -EOPNOTSUPP; 293 if (copy_from_user(®, arg, sizeof(reg))) 294 return -EFAULT; 295 296 if (reg.flags & ~PR_FL_IGNORE_KEY) 297 return -EOPNOTSUPP; 298 return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags); 299} 300 301static int blkdev_pr_reserve(struct block_device *bdev, blk_mode_t mode, 302 struct pr_reservation __user *arg) 303{ 304 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; 305 struct pr_reservation rsv; 306 307 if (!blkdev_pr_allowed(bdev, mode)) 308 return -EPERM; 309 if (!ops || !ops->pr_reserve) 310 return -EOPNOTSUPP; 311 if (copy_from_user(&rsv, arg, sizeof(rsv))) 312 return -EFAULT; 313 314 if (rsv.flags & ~PR_FL_IGNORE_KEY) 315 return -EOPNOTSUPP; 316 return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags); 317} 318 319static int blkdev_pr_release(struct block_device *bdev, blk_mode_t mode, 320 struct pr_reservation __user *arg) 321{ 322 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; 323 struct pr_reservation rsv; 324 325 if (!blkdev_pr_allowed(bdev, mode)) 326 return -EPERM; 327 if (!ops || !ops->pr_release) 328 return -EOPNOTSUPP; 329 if (copy_from_user(&rsv, arg, sizeof(rsv))) 330 return -EFAULT; 331 332 if (rsv.flags) 333 return -EOPNOTSUPP; 334 return ops->pr_release(bdev, rsv.key, rsv.type); 335} 336 337static int blkdev_pr_preempt(struct block_device *bdev, blk_mode_t mode, 338 struct pr_preempt __user *arg, bool abort) 339{ 340 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; 341 struct pr_preempt p; 342 343 if (!blkdev_pr_allowed(bdev, mode)) 344 return -EPERM; 345 if (!ops || !ops->pr_preempt) 346 return -EOPNOTSUPP; 347 if (copy_from_user(&p, arg, sizeof(p))) 348 return -EFAULT; 349 350 if (p.flags) 351 return -EOPNOTSUPP; 352 return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort); 353} 354 355static int blkdev_pr_clear(struct block_device *bdev, blk_mode_t mode, 356 struct pr_clear __user *arg) 357{ 358 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; 359 struct pr_clear c; 360 361 if (!blkdev_pr_allowed(bdev, mode)) 362 return -EPERM; 363 if (!ops || !ops->pr_clear) 364 return -EOPNOTSUPP; 365 if (copy_from_user(&c, arg, sizeof(c))) 366 return -EFAULT; 367 368 if (c.flags) 369 return -EOPNOTSUPP; 370 return ops->pr_clear(bdev, c.key); 371} 372 373static int blkdev_flushbuf(struct block_device *bdev, unsigned cmd, 374 unsigned long arg) 375{ 376 if (!capable(CAP_SYS_ADMIN)) 377 return -EACCES; 378 379 mutex_lock(&bdev->bd_holder_lock); 380 if (bdev->bd_holder_ops && bdev->bd_holder_ops->sync) 381 bdev->bd_holder_ops->sync(bdev); 382 else { 383 mutex_unlock(&bdev->bd_holder_lock); 384 sync_blockdev(bdev); 385 } 386 387 invalidate_bdev(bdev); 388 return 0; 389} 390 391static int blkdev_roset(struct block_device *bdev, unsigned cmd, 392 unsigned long arg) 393{ 394 int ret, n; 395 396 if (!capable(CAP_SYS_ADMIN)) 397 return -EACCES; 398 399 if (get_user(n, (int __user *)arg)) 400 return -EFAULT; 401 if (bdev->bd_disk->fops->set_read_only) { 402 ret = bdev->bd_disk->fops->set_read_only(bdev, n); 403 if (ret) 404 return ret; 405 } 406 bdev->bd_read_only = n; 407 return 0; 408} 409 410static int blkdev_getgeo(struct block_device *bdev, 411 struct hd_geometry __user *argp) 412{ 413 struct gendisk *disk = bdev->bd_disk; 414 struct hd_geometry geo; 415 int ret; 416 417 if (!argp) 418 return -EINVAL; 419 if (!disk->fops->getgeo) 420 return -ENOTTY; 421 422 /* 423 * We need to set the startsect first, the driver may 424 * want to override it. 425 */ 426 memset(&geo, 0, sizeof(geo)); 427 geo.start = get_start_sect(bdev); 428 ret = disk->fops->getgeo(bdev, &geo); 429 if (ret) 430 return ret; 431 if (copy_to_user(argp, &geo, sizeof(geo))) 432 return -EFAULT; 433 return 0; 434} 435 436#ifdef CONFIG_COMPAT 437struct compat_hd_geometry { 438 unsigned char heads; 439 unsigned char sectors; 440 unsigned short cylinders; 441 u32 start; 442}; 443 444static int compat_hdio_getgeo(struct block_device *bdev, 445 struct compat_hd_geometry __user *ugeo) 446{ 447 struct gendisk *disk = bdev->bd_disk; 448 struct hd_geometry geo; 449 int ret; 450 451 if (!ugeo) 452 return -EINVAL; 453 if (!disk->fops->getgeo) 454 return -ENOTTY; 455 456 memset(&geo, 0, sizeof(geo)); 457 /* 458 * We need to set the startsect first, the driver may 459 * want to override it. 460 */ 461 geo.start = get_start_sect(bdev); 462 ret = disk->fops->getgeo(bdev, &geo); 463 if (ret) 464 return ret; 465 466 ret = copy_to_user(ugeo, &geo, 4); 467 ret |= put_user(geo.start, &ugeo->start); 468 if (ret) 469 ret = -EFAULT; 470 471 return ret; 472} 473#endif 474 475/* set the logical block size */ 476static int blkdev_bszset(struct block_device *bdev, blk_mode_t mode, 477 int __user *argp) 478{ 479 int ret, n; 480 struct file *file; 481 482 if (!capable(CAP_SYS_ADMIN)) 483 return -EACCES; 484 if (!argp) 485 return -EINVAL; 486 if (get_user(n, argp)) 487 return -EFAULT; 488 489 if (mode & BLK_OPEN_EXCL) 490 return set_blocksize(bdev, n); 491 492 file = bdev_file_open_by_dev(bdev->bd_dev, mode, &bdev, NULL); 493 if (IS_ERR(file)) 494 return -EBUSY; 495 ret = set_blocksize(bdev, n); 496 fput(file); 497 return ret; 498} 499 500/* 501 * Common commands that are handled the same way on native and compat 502 * user space. Note the separate arg/argp parameters that are needed 503 * to deal with the compat_ptr() conversion. 504 */ 505static int blkdev_common_ioctl(struct block_device *bdev, blk_mode_t mode, 506 unsigned int cmd, unsigned long arg, 507 void __user *argp) 508{ 509 unsigned int max_sectors; 510 511 switch (cmd) { 512 case BLKFLSBUF: 513 return blkdev_flushbuf(bdev, cmd, arg); 514 case BLKROSET: 515 return blkdev_roset(bdev, cmd, arg); 516 case BLKDISCARD: 517 return blk_ioctl_discard(bdev, mode, arg); 518 case BLKSECDISCARD: 519 return blk_ioctl_secure_erase(bdev, mode, argp); 520 case BLKZEROOUT: 521 return blk_ioctl_zeroout(bdev, mode, arg); 522 case BLKGETDISKSEQ: 523 return put_u64(argp, bdev->bd_disk->diskseq); 524 case BLKREPORTZONE: 525 return blkdev_report_zones_ioctl(bdev, cmd, arg); 526 case BLKRESETZONE: 527 case BLKOPENZONE: 528 case BLKCLOSEZONE: 529 case BLKFINISHZONE: 530 return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg); 531 case BLKGETZONESZ: 532 return put_uint(argp, bdev_zone_sectors(bdev)); 533 case BLKGETNRZONES: 534 return put_uint(argp, bdev_nr_zones(bdev)); 535 case BLKROGET: 536 return put_int(argp, bdev_read_only(bdev) != 0); 537 case BLKSSZGET: /* get block device logical block size */ 538 return put_int(argp, bdev_logical_block_size(bdev)); 539 case BLKPBSZGET: /* get block device physical block size */ 540 return put_uint(argp, bdev_physical_block_size(bdev)); 541 case BLKIOMIN: 542 return put_uint(argp, bdev_io_min(bdev)); 543 case BLKIOOPT: 544 return put_uint(argp, bdev_io_opt(bdev)); 545 case BLKALIGNOFF: 546 return put_int(argp, bdev_alignment_offset(bdev)); 547 case BLKDISCARDZEROES: 548 return put_uint(argp, 0); 549 case BLKSECTGET: 550 max_sectors = min_t(unsigned int, USHRT_MAX, 551 queue_max_sectors(bdev_get_queue(bdev))); 552 return put_ushort(argp, max_sectors); 553 case BLKROTATIONAL: 554 return put_ushort(argp, !bdev_nonrot(bdev)); 555 case BLKRASET: 556 case BLKFRASET: 557 if(!capable(CAP_SYS_ADMIN)) 558 return -EACCES; 559 bdev->bd_disk->bdi->ra_pages = (arg * 512) / PAGE_SIZE; 560 return 0; 561 case BLKRRPART: 562 if (!capable(CAP_SYS_ADMIN)) 563 return -EACCES; 564 if (bdev_is_partition(bdev)) 565 return -EINVAL; 566 return disk_scan_partitions(bdev->bd_disk, 567 mode | BLK_OPEN_STRICT_SCAN); 568 case BLKTRACESTART: 569 case BLKTRACESTOP: 570 case BLKTRACETEARDOWN: 571 return blk_trace_ioctl(bdev, cmd, argp); 572 case IOC_PR_REGISTER: 573 return blkdev_pr_register(bdev, mode, argp); 574 case IOC_PR_RESERVE: 575 return blkdev_pr_reserve(bdev, mode, argp); 576 case IOC_PR_RELEASE: 577 return blkdev_pr_release(bdev, mode, argp); 578 case IOC_PR_PREEMPT: 579 return blkdev_pr_preempt(bdev, mode, argp, false); 580 case IOC_PR_PREEMPT_ABORT: 581 return blkdev_pr_preempt(bdev, mode, argp, true); 582 case IOC_PR_CLEAR: 583 return blkdev_pr_clear(bdev, mode, argp); 584 default: 585 return -ENOIOCTLCMD; 586 } 587} 588 589/* 590 * Always keep this in sync with compat_blkdev_ioctl() 591 * to handle all incompatible commands in both functions. 592 * 593 * New commands must be compatible and go into blkdev_common_ioctl 594 */ 595long blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg) 596{ 597 struct block_device *bdev = I_BDEV(file->f_mapping->host); 598 void __user *argp = (void __user *)arg; 599 blk_mode_t mode = file_to_blk_mode(file); 600 int ret; 601 602 switch (cmd) { 603 /* These need separate implementations for the data structure */ 604 case HDIO_GETGEO: 605 return blkdev_getgeo(bdev, argp); 606 case BLKPG: 607 return blkpg_ioctl(bdev, argp); 608 609 /* Compat mode returns 32-bit data instead of 'long' */ 610 case BLKRAGET: 611 case BLKFRAGET: 612 if (!argp) 613 return -EINVAL; 614 return put_long(argp, 615 (bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512); 616 case BLKGETSIZE: 617 if (bdev_nr_sectors(bdev) > ~0UL) 618 return -EFBIG; 619 return put_ulong(argp, bdev_nr_sectors(bdev)); 620 621 /* The data is compatible, but the command number is different */ 622 case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */ 623 return put_int(argp, block_size(bdev)); 624 case BLKBSZSET: 625 return blkdev_bszset(bdev, mode, argp); 626 case BLKGETSIZE64: 627 return put_u64(argp, bdev_nr_bytes(bdev)); 628 629 /* Incompatible alignment on i386 */ 630 case BLKTRACESETUP: 631 return blk_trace_ioctl(bdev, cmd, argp); 632 default: 633 break; 634 } 635 636 ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp); 637 if (ret != -ENOIOCTLCMD) 638 return ret; 639 640 if (!bdev->bd_disk->fops->ioctl) 641 return -ENOTTY; 642 return bdev->bd_disk->fops->ioctl(bdev, mode, cmd, arg); 643} 644 645#ifdef CONFIG_COMPAT 646 647#define BLKBSZGET_32 _IOR(0x12, 112, int) 648#define BLKBSZSET_32 _IOW(0x12, 113, int) 649#define BLKGETSIZE64_32 _IOR(0x12, 114, int) 650 651/* Most of the generic ioctls are handled in the normal fallback path. 652 This assumes the blkdev's low level compat_ioctl always returns 653 ENOIOCTLCMD for unknown ioctls. */ 654long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg) 655{ 656 int ret; 657 void __user *argp = compat_ptr(arg); 658 struct block_device *bdev = I_BDEV(file->f_mapping->host); 659 struct gendisk *disk = bdev->bd_disk; 660 blk_mode_t mode = file_to_blk_mode(file); 661 662 switch (cmd) { 663 /* These need separate implementations for the data structure */ 664 case HDIO_GETGEO: 665 return compat_hdio_getgeo(bdev, argp); 666 case BLKPG: 667 return compat_blkpg_ioctl(bdev, argp); 668 669 /* Compat mode returns 32-bit data instead of 'long' */ 670 case BLKRAGET: 671 case BLKFRAGET: 672 if (!argp) 673 return -EINVAL; 674 return compat_put_long(argp, 675 (bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512); 676 case BLKGETSIZE: 677 if (bdev_nr_sectors(bdev) > ~(compat_ulong_t)0) 678 return -EFBIG; 679 return compat_put_ulong(argp, bdev_nr_sectors(bdev)); 680 681 /* The data is compatible, but the command number is different */ 682 case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */ 683 return put_int(argp, bdev_logical_block_size(bdev)); 684 case BLKBSZSET_32: 685 return blkdev_bszset(bdev, mode, argp); 686 case BLKGETSIZE64_32: 687 return put_u64(argp, bdev_nr_bytes(bdev)); 688 689 /* Incompatible alignment on i386 */ 690 case BLKTRACESETUP32: 691 return blk_trace_ioctl(bdev, cmd, argp); 692 default: 693 break; 694 } 695 696 ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp); 697 if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl) 698 ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg); 699 700 return ret; 701} 702#endif 703