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, fmode_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 & FMODE_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, fmode_t mode, 124 void __user *argp) 125 { 126 uint64_t start, len; 127 uint64_t range[2]; 128 int err; 129 130 if (!(mode & FMODE_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, fmode_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 & FMODE_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, fmode_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 int blkdev_pr_register(struct block_device *bdev, 258 struct pr_registration __user *arg) 259 { 260 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; 261 struct pr_registration reg; 262 263 if (!capable(CAP_SYS_ADMIN)) 264 return -EPERM; 265 if (!ops || !ops->pr_register) 266 return -EOPNOTSUPP; 267 if (copy_from_user(®, arg, sizeof(reg))) 268 return -EFAULT; 269 270 if (reg.flags & ~PR_FL_IGNORE_KEY) 271 return -EOPNOTSUPP; 272 return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags); 273 } 274 275 static int blkdev_pr_reserve(struct block_device *bdev, 276 struct pr_reservation __user *arg) 277 { 278 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; 279 struct pr_reservation rsv; 280 281 if (!capable(CAP_SYS_ADMIN)) 282 return -EPERM; 283 if (!ops || !ops->pr_reserve) 284 return -EOPNOTSUPP; 285 if (copy_from_user(&rsv, arg, sizeof(rsv))) 286 return -EFAULT; 287 288 if (rsv.flags & ~PR_FL_IGNORE_KEY) 289 return -EOPNOTSUPP; 290 return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags); 291 } 292 293 static int blkdev_pr_release(struct block_device *bdev, 294 struct pr_reservation __user *arg) 295 { 296 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; 297 struct pr_reservation rsv; 298 299 if (!capable(CAP_SYS_ADMIN)) 300 return -EPERM; 301 if (!ops || !ops->pr_release) 302 return -EOPNOTSUPP; 303 if (copy_from_user(&rsv, arg, sizeof(rsv))) 304 return -EFAULT; 305 306 if (rsv.flags) 307 return -EOPNOTSUPP; 308 return ops->pr_release(bdev, rsv.key, rsv.type); 309 } 310 311 static int blkdev_pr_preempt(struct block_device *bdev, 312 struct pr_preempt __user *arg, bool abort) 313 { 314 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; 315 struct pr_preempt p; 316 317 if (!capable(CAP_SYS_ADMIN)) 318 return -EPERM; 319 if (!ops || !ops->pr_preempt) 320 return -EOPNOTSUPP; 321 if (copy_from_user(&p, arg, sizeof(p))) 322 return -EFAULT; 323 324 if (p.flags) 325 return -EOPNOTSUPP; 326 return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort); 327 } 328 329 static int blkdev_pr_clear(struct block_device *bdev, 330 struct pr_clear __user *arg) 331 { 332 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; 333 struct pr_clear c; 334 335 if (!capable(CAP_SYS_ADMIN)) 336 return -EPERM; 337 if (!ops || !ops->pr_clear) 338 return -EOPNOTSUPP; 339 if (copy_from_user(&c, arg, sizeof(c))) 340 return -EFAULT; 341 342 if (c.flags) 343 return -EOPNOTSUPP; 344 return ops->pr_clear(bdev, c.key); 345 } 346 347 static int blkdev_flushbuf(struct block_device *bdev, fmode_t mode, 348 unsigned cmd, unsigned long arg) 349 { 350 if (!capable(CAP_SYS_ADMIN)) 351 return -EACCES; 352 fsync_bdev(bdev); 353 invalidate_bdev(bdev); 354 return 0; 355 } 356 357 static int blkdev_roset(struct block_device *bdev, fmode_t mode, 358 unsigned cmd, unsigned long arg) 359 { 360 int ret, n; 361 362 if (!capable(CAP_SYS_ADMIN)) 363 return -EACCES; 364 365 if (get_user(n, (int __user *)arg)) 366 return -EFAULT; 367 if (bdev->bd_disk->fops->set_read_only) { 368 ret = bdev->bd_disk->fops->set_read_only(bdev, n); 369 if (ret) 370 return ret; 371 } 372 bdev->bd_read_only = n; 373 return 0; 374 } 375 376 static int blkdev_getgeo(struct block_device *bdev, 377 struct hd_geometry __user *argp) 378 { 379 struct gendisk *disk = bdev->bd_disk; 380 struct hd_geometry geo; 381 int ret; 382 383 if (!argp) 384 return -EINVAL; 385 if (!disk->fops->getgeo) 386 return -ENOTTY; 387 388 /* 389 * We need to set the startsect first, the driver may 390 * want to override it. 391 */ 392 memset(&geo, 0, sizeof(geo)); 393 geo.start = get_start_sect(bdev); 394 ret = disk->fops->getgeo(bdev, &geo); 395 if (ret) 396 return ret; 397 if (copy_to_user(argp, &geo, sizeof(geo))) 398 return -EFAULT; 399 return 0; 400 } 401 402 #ifdef CONFIG_COMPAT 403 struct compat_hd_geometry { 404 unsigned char heads; 405 unsigned char sectors; 406 unsigned short cylinders; 407 u32 start; 408 }; 409 410 static int compat_hdio_getgeo(struct block_device *bdev, 411 struct compat_hd_geometry __user *ugeo) 412 { 413 struct gendisk *disk = bdev->bd_disk; 414 struct hd_geometry geo; 415 int ret; 416 417 if (!ugeo) 418 return -EINVAL; 419 if (!disk->fops->getgeo) 420 return -ENOTTY; 421 422 memset(&geo, 0, sizeof(geo)); 423 /* 424 * We need to set the startsect first, the driver may 425 * want to override it. 426 */ 427 geo.start = get_start_sect(bdev); 428 ret = disk->fops->getgeo(bdev, &geo); 429 if (ret) 430 return ret; 431 432 ret = copy_to_user(ugeo, &geo, 4); 433 ret |= put_user(geo.start, &ugeo->start); 434 if (ret) 435 ret = -EFAULT; 436 437 return ret; 438 } 439 #endif 440 441 /* set the logical block size */ 442 static int blkdev_bszset(struct block_device *bdev, fmode_t mode, 443 int __user *argp) 444 { 445 int ret, n; 446 447 if (!capable(CAP_SYS_ADMIN)) 448 return -EACCES; 449 if (!argp) 450 return -EINVAL; 451 if (get_user(n, argp)) 452 return -EFAULT; 453 454 if (mode & FMODE_EXCL) 455 return set_blocksize(bdev, n); 456 457 if (IS_ERR(blkdev_get_by_dev(bdev->bd_dev, mode | FMODE_EXCL, &bdev))) 458 return -EBUSY; 459 ret = set_blocksize(bdev, n); 460 blkdev_put(bdev, mode | FMODE_EXCL); 461 462 return ret; 463 } 464 465 /* 466 * Common commands that are handled the same way on native and compat 467 * user space. Note the separate arg/argp parameters that are needed 468 * to deal with the compat_ptr() conversion. 469 */ 470 static int blkdev_common_ioctl(struct block_device *bdev, fmode_t mode, 471 unsigned cmd, unsigned long arg, void __user *argp) 472 { 473 unsigned int max_sectors; 474 475 switch (cmd) { 476 case BLKFLSBUF: 477 return blkdev_flushbuf(bdev, mode, cmd, arg); 478 case BLKROSET: 479 return blkdev_roset(bdev, mode, cmd, arg); 480 case BLKDISCARD: 481 return blk_ioctl_discard(bdev, mode, arg); 482 case BLKSECDISCARD: 483 return blk_ioctl_secure_erase(bdev, mode, argp); 484 case BLKZEROOUT: 485 return blk_ioctl_zeroout(bdev, mode, arg); 486 case BLKGETDISKSEQ: 487 return put_u64(argp, bdev->bd_disk->diskseq); 488 case BLKREPORTZONE: 489 return blkdev_report_zones_ioctl(bdev, mode, cmd, arg); 490 case BLKRESETZONE: 491 case BLKOPENZONE: 492 case BLKCLOSEZONE: 493 case BLKFINISHZONE: 494 return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg); 495 case BLKGETZONESZ: 496 return put_uint(argp, bdev_zone_sectors(bdev)); 497 case BLKGETNRZONES: 498 return put_uint(argp, bdev_nr_zones(bdev)); 499 case BLKROGET: 500 return put_int(argp, bdev_read_only(bdev) != 0); 501 case BLKSSZGET: /* get block device logical block size */ 502 return put_int(argp, bdev_logical_block_size(bdev)); 503 case BLKPBSZGET: /* get block device physical block size */ 504 return put_uint(argp, bdev_physical_block_size(bdev)); 505 case BLKIOMIN: 506 return put_uint(argp, bdev_io_min(bdev)); 507 case BLKIOOPT: 508 return put_uint(argp, bdev_io_opt(bdev)); 509 case BLKALIGNOFF: 510 return put_int(argp, bdev_alignment_offset(bdev)); 511 case BLKDISCARDZEROES: 512 return put_uint(argp, 0); 513 case BLKSECTGET: 514 max_sectors = min_t(unsigned int, USHRT_MAX, 515 queue_max_sectors(bdev_get_queue(bdev))); 516 return put_ushort(argp, max_sectors); 517 case BLKROTATIONAL: 518 return put_ushort(argp, !bdev_nonrot(bdev)); 519 case BLKRASET: 520 case BLKFRASET: 521 if(!capable(CAP_SYS_ADMIN)) 522 return -EACCES; 523 bdev->bd_disk->bdi->ra_pages = (arg * 512) / PAGE_SIZE; 524 return 0; 525 case BLKRRPART: 526 if (!capable(CAP_SYS_ADMIN)) 527 return -EACCES; 528 if (bdev_is_partition(bdev)) 529 return -EINVAL; 530 return disk_scan_partitions(bdev->bd_disk, mode & ~FMODE_EXCL); 531 case BLKTRACESTART: 532 case BLKTRACESTOP: 533 case BLKTRACETEARDOWN: 534 return blk_trace_ioctl(bdev, cmd, argp); 535 case IOC_PR_REGISTER: 536 return blkdev_pr_register(bdev, argp); 537 case IOC_PR_RESERVE: 538 return blkdev_pr_reserve(bdev, argp); 539 case IOC_PR_RELEASE: 540 return blkdev_pr_release(bdev, argp); 541 case IOC_PR_PREEMPT: 542 return blkdev_pr_preempt(bdev, argp, false); 543 case IOC_PR_PREEMPT_ABORT: 544 return blkdev_pr_preempt(bdev, argp, true); 545 case IOC_PR_CLEAR: 546 return blkdev_pr_clear(bdev, argp); 547 default: 548 return -ENOIOCTLCMD; 549 } 550 } 551 552 /* 553 * Always keep this in sync with compat_blkdev_ioctl() 554 * to handle all incompatible commands in both functions. 555 * 556 * New commands must be compatible and go into blkdev_common_ioctl 557 */ 558 long blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg) 559 { 560 struct block_device *bdev = I_BDEV(file->f_mapping->host); 561 void __user *argp = (void __user *)arg; 562 fmode_t mode = file->f_mode; 563 int ret; 564 565 /* 566 * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have 567 * to updated it before every ioctl. 568 */ 569 if (file->f_flags & O_NDELAY) 570 mode |= FMODE_NDELAY; 571 else 572 mode &= ~FMODE_NDELAY; 573 574 switch (cmd) { 575 /* These need separate implementations for the data structure */ 576 case HDIO_GETGEO: 577 return blkdev_getgeo(bdev, argp); 578 case BLKPG: 579 return blkpg_ioctl(bdev, argp); 580 581 /* Compat mode returns 32-bit data instead of 'long' */ 582 case BLKRAGET: 583 case BLKFRAGET: 584 if (!argp) 585 return -EINVAL; 586 return put_long(argp, 587 (bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512); 588 case BLKGETSIZE: 589 if (bdev_nr_sectors(bdev) > ~0UL) 590 return -EFBIG; 591 return put_ulong(argp, bdev_nr_sectors(bdev)); 592 593 /* The data is compatible, but the command number is different */ 594 case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */ 595 return put_int(argp, block_size(bdev)); 596 case BLKBSZSET: 597 return blkdev_bszset(bdev, mode, argp); 598 case BLKGETSIZE64: 599 return put_u64(argp, bdev_nr_bytes(bdev)); 600 601 /* Incompatible alignment on i386 */ 602 case BLKTRACESETUP: 603 return blk_trace_ioctl(bdev, cmd, argp); 604 default: 605 break; 606 } 607 608 ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp); 609 if (ret != -ENOIOCTLCMD) 610 return ret; 611 612 if (!bdev->bd_disk->fops->ioctl) 613 return -ENOTTY; 614 return bdev->bd_disk->fops->ioctl(bdev, mode, cmd, arg); 615 } 616 617 #ifdef CONFIG_COMPAT 618 619 #define BLKBSZGET_32 _IOR(0x12, 112, int) 620 #define BLKBSZSET_32 _IOW(0x12, 113, int) 621 #define BLKGETSIZE64_32 _IOR(0x12, 114, int) 622 623 /* Most of the generic ioctls are handled in the normal fallback path. 624 This assumes the blkdev's low level compat_ioctl always returns 625 ENOIOCTLCMD for unknown ioctls. */ 626 long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg) 627 { 628 int ret; 629 void __user *argp = compat_ptr(arg); 630 struct block_device *bdev = I_BDEV(file->f_mapping->host); 631 struct gendisk *disk = bdev->bd_disk; 632 fmode_t mode = file->f_mode; 633 634 /* 635 * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have 636 * to updated it before every ioctl. 637 */ 638 if (file->f_flags & O_NDELAY) 639 mode |= FMODE_NDELAY; 640 else 641 mode &= ~FMODE_NDELAY; 642 643 switch (cmd) { 644 /* These need separate implementations for the data structure */ 645 case HDIO_GETGEO: 646 return compat_hdio_getgeo(bdev, argp); 647 case BLKPG: 648 return compat_blkpg_ioctl(bdev, argp); 649 650 /* Compat mode returns 32-bit data instead of 'long' */ 651 case BLKRAGET: 652 case BLKFRAGET: 653 if (!argp) 654 return -EINVAL; 655 return compat_put_long(argp, 656 (bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512); 657 case BLKGETSIZE: 658 if (bdev_nr_sectors(bdev) > ~(compat_ulong_t)0) 659 return -EFBIG; 660 return compat_put_ulong(argp, bdev_nr_sectors(bdev)); 661 662 /* The data is compatible, but the command number is different */ 663 case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */ 664 return put_int(argp, bdev_logical_block_size(bdev)); 665 case BLKBSZSET_32: 666 return blkdev_bszset(bdev, mode, argp); 667 case BLKGETSIZE64_32: 668 return put_u64(argp, bdev_nr_bytes(bdev)); 669 670 /* Incompatible alignment on i386 */ 671 case BLKTRACESETUP32: 672 return blk_trace_ioctl(bdev, cmd, argp); 673 default: 674 break; 675 } 676 677 ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp); 678 if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl) 679 ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg); 680 681 return ret; 682 } 683 #endif 684