1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/capability.h> 3 #include <linux/blkdev.h> 4 #include <linux/export.h> 5 #include <linux/gfp.h> 6 #include <linux/blkpg.h> 7 #include <linux/hdreg.h> 8 #include <linux/backing-dev.h> 9 #include <linux/fs.h> 10 #include <linux/blktrace_api.h> 11 #include <linux/pr.h> 12 #include <linux/uaccess.h> 13 14 static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user *arg) 15 { 16 struct block_device *bdevp; 17 struct gendisk *disk; 18 struct hd_struct *part, *lpart; 19 struct blkpg_ioctl_arg a; 20 struct blkpg_partition p; 21 struct disk_part_iter piter; 22 long long start, length; 23 int partno; 24 25 if (!capable(CAP_SYS_ADMIN)) 26 return -EACCES; 27 if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg))) 28 return -EFAULT; 29 if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition))) 30 return -EFAULT; 31 disk = bdev->bd_disk; 32 if (bdev != bdev->bd_contains) 33 return -EINVAL; 34 partno = p.pno; 35 if (partno <= 0) 36 return -EINVAL; 37 switch (a.op) { 38 case BLKPG_ADD_PARTITION: 39 start = p.start >> 9; 40 length = p.length >> 9; 41 /* check for fit in a hd_struct */ 42 if (sizeof(sector_t) == sizeof(long) && 43 sizeof(long long) > sizeof(long)) { 44 long pstart = start, plength = length; 45 if (pstart != start || plength != length 46 || pstart < 0 || plength < 0 || partno > 65535) 47 return -EINVAL; 48 } 49 /* check if partition is aligned to blocksize */ 50 if (p.start & (bdev_logical_block_size(bdev) - 1)) 51 return -EINVAL; 52 53 mutex_lock(&bdev->bd_mutex); 54 55 /* overlap? */ 56 disk_part_iter_init(&piter, disk, 57 DISK_PITER_INCL_EMPTY); 58 while ((part = disk_part_iter_next(&piter))) { 59 if (!(start + length <= part->start_sect || 60 start >= part->start_sect + part->nr_sects)) { 61 disk_part_iter_exit(&piter); 62 mutex_unlock(&bdev->bd_mutex); 63 return -EBUSY; 64 } 65 } 66 disk_part_iter_exit(&piter); 67 68 /* all seems OK */ 69 part = add_partition(disk, partno, start, length, 70 ADDPART_FLAG_NONE, NULL); 71 mutex_unlock(&bdev->bd_mutex); 72 return PTR_ERR_OR_ZERO(part); 73 case BLKPG_DEL_PARTITION: 74 part = disk_get_part(disk, partno); 75 if (!part) 76 return -ENXIO; 77 78 bdevp = bdget(part_devt(part)); 79 disk_put_part(part); 80 if (!bdevp) 81 return -ENOMEM; 82 83 mutex_lock(&bdevp->bd_mutex); 84 if (bdevp->bd_openers) { 85 mutex_unlock(&bdevp->bd_mutex); 86 bdput(bdevp); 87 return -EBUSY; 88 } 89 /* all seems OK */ 90 fsync_bdev(bdevp); 91 invalidate_bdev(bdevp); 92 93 mutex_lock_nested(&bdev->bd_mutex, 1); 94 delete_partition(disk, partno); 95 mutex_unlock(&bdev->bd_mutex); 96 mutex_unlock(&bdevp->bd_mutex); 97 bdput(bdevp); 98 99 return 0; 100 case BLKPG_RESIZE_PARTITION: 101 start = p.start >> 9; 102 /* new length of partition in bytes */ 103 length = p.length >> 9; 104 /* check for fit in a hd_struct */ 105 if (sizeof(sector_t) == sizeof(long) && 106 sizeof(long long) > sizeof(long)) { 107 long pstart = start, plength = length; 108 if (pstart != start || plength != length 109 || pstart < 0 || plength < 0) 110 return -EINVAL; 111 } 112 part = disk_get_part(disk, partno); 113 if (!part) 114 return -ENXIO; 115 bdevp = bdget(part_devt(part)); 116 if (!bdevp) { 117 disk_put_part(part); 118 return -ENOMEM; 119 } 120 mutex_lock(&bdevp->bd_mutex); 121 mutex_lock_nested(&bdev->bd_mutex, 1); 122 if (start != part->start_sect) { 123 mutex_unlock(&bdevp->bd_mutex); 124 mutex_unlock(&bdev->bd_mutex); 125 bdput(bdevp); 126 disk_put_part(part); 127 return -EINVAL; 128 } 129 /* overlap? */ 130 disk_part_iter_init(&piter, disk, 131 DISK_PITER_INCL_EMPTY); 132 while ((lpart = disk_part_iter_next(&piter))) { 133 if (lpart->partno != partno && 134 !(start + length <= lpart->start_sect || 135 start >= lpart->start_sect + lpart->nr_sects) 136 ) { 137 disk_part_iter_exit(&piter); 138 mutex_unlock(&bdevp->bd_mutex); 139 mutex_unlock(&bdev->bd_mutex); 140 bdput(bdevp); 141 disk_put_part(part); 142 return -EBUSY; 143 } 144 } 145 disk_part_iter_exit(&piter); 146 part_nr_sects_write(part, (sector_t)length); 147 i_size_write(bdevp->bd_inode, p.length); 148 mutex_unlock(&bdevp->bd_mutex); 149 mutex_unlock(&bdev->bd_mutex); 150 bdput(bdevp); 151 disk_put_part(part); 152 return 0; 153 default: 154 return -EINVAL; 155 } 156 } 157 158 static int blkdev_reread_part(struct block_device *bdev) 159 { 160 int ret; 161 162 if (!disk_part_scan_enabled(bdev->bd_disk) || bdev != bdev->bd_contains) 163 return -EINVAL; 164 if (!capable(CAP_SYS_ADMIN)) 165 return -EACCES; 166 167 mutex_lock(&bdev->bd_mutex); 168 ret = bdev_disk_changed(bdev, false); 169 mutex_unlock(&bdev->bd_mutex); 170 171 return ret; 172 } 173 174 static int blk_ioctl_discard(struct block_device *bdev, fmode_t mode, 175 unsigned long arg, unsigned long flags) 176 { 177 uint64_t range[2]; 178 uint64_t start, len; 179 struct request_queue *q = bdev_get_queue(bdev); 180 struct address_space *mapping = bdev->bd_inode->i_mapping; 181 182 183 if (!(mode & FMODE_WRITE)) 184 return -EBADF; 185 186 if (!blk_queue_discard(q)) 187 return -EOPNOTSUPP; 188 189 if (copy_from_user(range, (void __user *)arg, sizeof(range))) 190 return -EFAULT; 191 192 start = range[0]; 193 len = range[1]; 194 195 if (start & 511) 196 return -EINVAL; 197 if (len & 511) 198 return -EINVAL; 199 200 if (start + len > i_size_read(bdev->bd_inode)) 201 return -EINVAL; 202 truncate_inode_pages_range(mapping, start, start + len - 1); 203 return blkdev_issue_discard(bdev, start >> 9, len >> 9, 204 GFP_KERNEL, flags); 205 } 206 207 static int blk_ioctl_zeroout(struct block_device *bdev, fmode_t mode, 208 unsigned long arg) 209 { 210 uint64_t range[2]; 211 struct address_space *mapping; 212 uint64_t start, end, len; 213 214 if (!(mode & FMODE_WRITE)) 215 return -EBADF; 216 217 if (copy_from_user(range, (void __user *)arg, sizeof(range))) 218 return -EFAULT; 219 220 start = range[0]; 221 len = range[1]; 222 end = start + len - 1; 223 224 if (start & 511) 225 return -EINVAL; 226 if (len & 511) 227 return -EINVAL; 228 if (end >= (uint64_t)i_size_read(bdev->bd_inode)) 229 return -EINVAL; 230 if (end < start) 231 return -EINVAL; 232 233 /* Invalidate the page cache, including dirty pages */ 234 mapping = bdev->bd_inode->i_mapping; 235 truncate_inode_pages_range(mapping, start, end); 236 237 return blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL, 238 BLKDEV_ZERO_NOUNMAP); 239 } 240 241 static int put_ushort(unsigned long arg, unsigned short val) 242 { 243 return put_user(val, (unsigned short __user *)arg); 244 } 245 246 static int put_int(unsigned long arg, int val) 247 { 248 return put_user(val, (int __user *)arg); 249 } 250 251 static int put_uint(unsigned long arg, unsigned int val) 252 { 253 return put_user(val, (unsigned int __user *)arg); 254 } 255 256 static int put_long(unsigned long arg, long val) 257 { 258 return put_user(val, (long __user *)arg); 259 } 260 261 static int put_ulong(unsigned long arg, unsigned long val) 262 { 263 return put_user(val, (unsigned long __user *)arg); 264 } 265 266 static int put_u64(unsigned long arg, u64 val) 267 { 268 return put_user(val, (u64 __user *)arg); 269 } 270 271 int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode, 272 unsigned cmd, unsigned long arg) 273 { 274 struct gendisk *disk = bdev->bd_disk; 275 276 if (disk->fops->ioctl) 277 return disk->fops->ioctl(bdev, mode, cmd, arg); 278 279 return -ENOTTY; 280 } 281 /* 282 * For the record: _GPL here is only because somebody decided to slap it 283 * on the previous export. Sheer idiocy, since it wasn't copyrightable 284 * at all and could be open-coded without any exports by anybody who cares. 285 */ 286 EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl); 287 288 static int blkdev_pr_register(struct block_device *bdev, 289 struct pr_registration __user *arg) 290 { 291 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; 292 struct pr_registration reg; 293 294 if (!capable(CAP_SYS_ADMIN)) 295 return -EPERM; 296 if (!ops || !ops->pr_register) 297 return -EOPNOTSUPP; 298 if (copy_from_user(®, arg, sizeof(reg))) 299 return -EFAULT; 300 301 if (reg.flags & ~PR_FL_IGNORE_KEY) 302 return -EOPNOTSUPP; 303 return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags); 304 } 305 306 static int blkdev_pr_reserve(struct block_device *bdev, 307 struct pr_reservation __user *arg) 308 { 309 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; 310 struct pr_reservation rsv; 311 312 if (!capable(CAP_SYS_ADMIN)) 313 return -EPERM; 314 if (!ops || !ops->pr_reserve) 315 return -EOPNOTSUPP; 316 if (copy_from_user(&rsv, arg, sizeof(rsv))) 317 return -EFAULT; 318 319 if (rsv.flags & ~PR_FL_IGNORE_KEY) 320 return -EOPNOTSUPP; 321 return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags); 322 } 323 324 static int blkdev_pr_release(struct block_device *bdev, 325 struct pr_reservation __user *arg) 326 { 327 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; 328 struct pr_reservation rsv; 329 330 if (!capable(CAP_SYS_ADMIN)) 331 return -EPERM; 332 if (!ops || !ops->pr_release) 333 return -EOPNOTSUPP; 334 if (copy_from_user(&rsv, arg, sizeof(rsv))) 335 return -EFAULT; 336 337 if (rsv.flags) 338 return -EOPNOTSUPP; 339 return ops->pr_release(bdev, rsv.key, rsv.type); 340 } 341 342 static int blkdev_pr_preempt(struct block_device *bdev, 343 struct pr_preempt __user *arg, bool abort) 344 { 345 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; 346 struct pr_preempt p; 347 348 if (!capable(CAP_SYS_ADMIN)) 349 return -EPERM; 350 if (!ops || !ops->pr_preempt) 351 return -EOPNOTSUPP; 352 if (copy_from_user(&p, arg, sizeof(p))) 353 return -EFAULT; 354 355 if (p.flags) 356 return -EOPNOTSUPP; 357 return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort); 358 } 359 360 static int blkdev_pr_clear(struct block_device *bdev, 361 struct pr_clear __user *arg) 362 { 363 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; 364 struct pr_clear c; 365 366 if (!capable(CAP_SYS_ADMIN)) 367 return -EPERM; 368 if (!ops || !ops->pr_clear) 369 return -EOPNOTSUPP; 370 if (copy_from_user(&c, arg, sizeof(c))) 371 return -EFAULT; 372 373 if (c.flags) 374 return -EOPNOTSUPP; 375 return ops->pr_clear(bdev, c.key); 376 } 377 378 /* 379 * Is it an unrecognized ioctl? The correct returns are either 380 * ENOTTY (final) or ENOIOCTLCMD ("I don't know this one, try a 381 * fallback"). ENOIOCTLCMD gets turned into ENOTTY by the ioctl 382 * code before returning. 383 * 384 * Confused drivers sometimes return EINVAL, which is wrong. It 385 * means "I understood the ioctl command, but the parameters to 386 * it were wrong". 387 * 388 * We should aim to just fix the broken drivers, the EINVAL case 389 * should go away. 390 */ 391 static inline int is_unrecognized_ioctl(int ret) 392 { 393 return ret == -EINVAL || 394 ret == -ENOTTY || 395 ret == -ENOIOCTLCMD; 396 } 397 398 static int blkdev_flushbuf(struct block_device *bdev, fmode_t mode, 399 unsigned cmd, unsigned long arg) 400 { 401 int ret; 402 403 if (!capable(CAP_SYS_ADMIN)) 404 return -EACCES; 405 406 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg); 407 if (!is_unrecognized_ioctl(ret)) 408 return ret; 409 410 fsync_bdev(bdev); 411 invalidate_bdev(bdev); 412 return 0; 413 } 414 415 static int blkdev_roset(struct block_device *bdev, fmode_t mode, 416 unsigned cmd, unsigned long arg) 417 { 418 int ret, n; 419 420 if (!capable(CAP_SYS_ADMIN)) 421 return -EACCES; 422 423 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg); 424 if (!is_unrecognized_ioctl(ret)) 425 return ret; 426 if (get_user(n, (int __user *)arg)) 427 return -EFAULT; 428 set_device_ro(bdev, n); 429 return 0; 430 } 431 432 static int blkdev_getgeo(struct block_device *bdev, 433 struct hd_geometry __user *argp) 434 { 435 struct gendisk *disk = bdev->bd_disk; 436 struct hd_geometry geo; 437 int ret; 438 439 if (!argp) 440 return -EINVAL; 441 if (!disk->fops->getgeo) 442 return -ENOTTY; 443 444 /* 445 * We need to set the startsect first, the driver may 446 * want to override it. 447 */ 448 memset(&geo, 0, sizeof(geo)); 449 geo.start = get_start_sect(bdev); 450 ret = disk->fops->getgeo(bdev, &geo); 451 if (ret) 452 return ret; 453 if (copy_to_user(argp, &geo, sizeof(geo))) 454 return -EFAULT; 455 return 0; 456 } 457 458 /* set the logical block size */ 459 static int blkdev_bszset(struct block_device *bdev, fmode_t mode, 460 int __user *argp) 461 { 462 int ret, n; 463 464 if (!capable(CAP_SYS_ADMIN)) 465 return -EACCES; 466 if (!argp) 467 return -EINVAL; 468 if (get_user(n, argp)) 469 return -EFAULT; 470 471 if (!(mode & FMODE_EXCL)) { 472 bdgrab(bdev); 473 if (blkdev_get(bdev, mode | FMODE_EXCL, &bdev) < 0) 474 return -EBUSY; 475 } 476 477 ret = set_blocksize(bdev, n); 478 if (!(mode & FMODE_EXCL)) 479 blkdev_put(bdev, mode | FMODE_EXCL); 480 return ret; 481 } 482 483 /* 484 * always keep this in sync with compat_blkdev_ioctl() 485 */ 486 int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, 487 unsigned long arg) 488 { 489 void __user *argp = (void __user *)arg; 490 loff_t size; 491 unsigned int max_sectors; 492 493 switch (cmd) { 494 case BLKFLSBUF: 495 return blkdev_flushbuf(bdev, mode, cmd, arg); 496 case BLKROSET: 497 return blkdev_roset(bdev, mode, cmd, arg); 498 case BLKDISCARD: 499 return blk_ioctl_discard(bdev, mode, arg, 0); 500 case BLKSECDISCARD: 501 return blk_ioctl_discard(bdev, mode, arg, 502 BLKDEV_DISCARD_SECURE); 503 case BLKZEROOUT: 504 return blk_ioctl_zeroout(bdev, mode, arg); 505 case BLKREPORTZONE: 506 return blkdev_report_zones_ioctl(bdev, mode, cmd, arg); 507 case BLKRESETZONE: 508 case BLKOPENZONE: 509 case BLKCLOSEZONE: 510 case BLKFINISHZONE: 511 return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg); 512 case BLKGETZONESZ: 513 return put_uint(arg, bdev_zone_sectors(bdev)); 514 case BLKGETNRZONES: 515 return put_uint(arg, blkdev_nr_zones(bdev->bd_disk)); 516 case HDIO_GETGEO: 517 return blkdev_getgeo(bdev, argp); 518 case BLKRAGET: 519 case BLKFRAGET: 520 if (!arg) 521 return -EINVAL; 522 return put_long(arg, (bdev->bd_bdi->ra_pages*PAGE_SIZE) / 512); 523 case BLKROGET: 524 return put_int(arg, bdev_read_only(bdev) != 0); 525 case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */ 526 return put_int(arg, block_size(bdev)); 527 case BLKSSZGET: /* get block device logical block size */ 528 return put_int(arg, bdev_logical_block_size(bdev)); 529 case BLKPBSZGET: /* get block device physical block size */ 530 return put_uint(arg, bdev_physical_block_size(bdev)); 531 case BLKIOMIN: 532 return put_uint(arg, bdev_io_min(bdev)); 533 case BLKIOOPT: 534 return put_uint(arg, bdev_io_opt(bdev)); 535 case BLKALIGNOFF: 536 return put_int(arg, bdev_alignment_offset(bdev)); 537 case BLKDISCARDZEROES: 538 return put_uint(arg, 0); 539 case BLKSECTGET: 540 max_sectors = min_t(unsigned int, USHRT_MAX, 541 queue_max_sectors(bdev_get_queue(bdev))); 542 return put_ushort(arg, max_sectors); 543 case BLKROTATIONAL: 544 return put_ushort(arg, !blk_queue_nonrot(bdev_get_queue(bdev))); 545 case BLKRASET: 546 case BLKFRASET: 547 if(!capable(CAP_SYS_ADMIN)) 548 return -EACCES; 549 bdev->bd_bdi->ra_pages = (arg * 512) / PAGE_SIZE; 550 return 0; 551 case BLKBSZSET: 552 return blkdev_bszset(bdev, mode, argp); 553 case BLKPG: 554 return blkpg_ioctl(bdev, argp); 555 case BLKRRPART: 556 return blkdev_reread_part(bdev); 557 case BLKGETSIZE: 558 size = i_size_read(bdev->bd_inode); 559 if ((size >> 9) > ~0UL) 560 return -EFBIG; 561 return put_ulong(arg, size >> 9); 562 case BLKGETSIZE64: 563 return put_u64(arg, i_size_read(bdev->bd_inode)); 564 case BLKTRACESTART: 565 case BLKTRACESTOP: 566 case BLKTRACESETUP: 567 case BLKTRACETEARDOWN: 568 return blk_trace_ioctl(bdev, cmd, argp); 569 case IOC_PR_REGISTER: 570 return blkdev_pr_register(bdev, argp); 571 case IOC_PR_RESERVE: 572 return blkdev_pr_reserve(bdev, argp); 573 case IOC_PR_RELEASE: 574 return blkdev_pr_release(bdev, argp); 575 case IOC_PR_PREEMPT: 576 return blkdev_pr_preempt(bdev, argp, false); 577 case IOC_PR_PREEMPT_ABORT: 578 return blkdev_pr_preempt(bdev, argp, true); 579 case IOC_PR_CLEAR: 580 return blkdev_pr_clear(bdev, argp); 581 default: 582 return __blkdev_driver_ioctl(bdev, mode, cmd, arg); 583 } 584 } 585 EXPORT_SYMBOL_GPL(blkdev_ioctl); 586