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>
7 #include <linux/blkpg.h>
8 #include <linux/hdreg.h>
9 #include <linux/backing-dev.h>
11 #include <linux/blktrace_api.h>
13 #include <linux/uaccess.h>
16 static int blkpg_do_ioctl(struct block_device *bdev,
17 struct blkpg_partition __user *upart, int op)
19 struct gendisk *disk = bdev->bd_disk;
20 struct blkpg_partition p;
21 sector_t start, length, capacity, end;
23 if (!capable(CAP_SYS_ADMIN))
25 if (copy_from_user(&p, upart, sizeof(struct blkpg_partition)))
27 if (bdev_is_partition(bdev))
33 if (op == BLKPG_DEL_PARTITION)
34 return bdev_del_partition(disk, p.pno);
36 if (p.start < 0 || p.length <= 0 || p.start + p.length < 0)
38 /* Check that the partition is aligned to the block size */
39 if (!IS_ALIGNED(p.start | p.length, bdev_logical_block_size(bdev)))
42 start = p.start >> SECTOR_SHIFT;
43 length = p.length >> SECTOR_SHIFT;
44 capacity = get_capacity(disk);
46 if (check_add_overflow(start, length, &end))
49 if (start >= capacity || end > capacity)
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);
62 static int blkpg_ioctl(struct block_device *bdev,
63 struct blkpg_ioctl_arg __user *arg)
65 struct blkpg_partition __user *udata;
68 if (get_user(op, &arg->op) || get_user(udata, &arg->data))
71 return blkpg_do_ioctl(bdev, udata, op);
75 struct compat_blkpg_ioctl_arg {
82 static int compat_blkpg_ioctl(struct block_device *bdev,
83 struct compat_blkpg_ioctl_arg __user *arg)
88 if (get_user(op, &arg->op) || get_user(udata, &arg->data))
91 return blkpg_do_ioctl(bdev, compat_ptr(udata), op);
95 static int blk_ioctl_discard(struct block_device *bdev, blk_mode_t mode,
100 struct inode *inode = bdev->bd_inode;
103 if (!(mode & BLK_OPEN_WRITE))
106 if (!bdev_max_discard_sectors(bdev))
109 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
120 if (start + len > bdev_nr_bytes(bdev))
123 filemap_invalidate_lock(inode->i_mapping);
124 err = truncate_bdev_range(bdev, mode, start, start + len - 1);
127 err = blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_KERNEL);
129 filemap_invalidate_unlock(inode->i_mapping);
133 static int blk_ioctl_secure_erase(struct block_device *bdev, blk_mode_t mode,
140 if (!(mode & BLK_OPEN_WRITE))
142 if (!bdev_max_secure_erase_sectors(bdev))
144 if (copy_from_user(range, argp, sizeof(range)))
149 if ((start & 511) || (len & 511))
151 if (start + len > bdev_nr_bytes(bdev))
154 filemap_invalidate_lock(bdev->bd_inode->i_mapping);
155 err = truncate_bdev_range(bdev, mode, start, start + len - 1);
157 err = blkdev_issue_secure_erase(bdev, start >> 9, len >> 9,
159 filemap_invalidate_unlock(bdev->bd_inode->i_mapping);
164 static int blk_ioctl_zeroout(struct block_device *bdev, blk_mode_t mode,
168 uint64_t start, end, len;
169 struct inode *inode = bdev->bd_inode;
172 if (!(mode & BLK_OPEN_WRITE))
175 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
180 end = start + len - 1;
186 if (end >= (uint64_t)bdev_nr_bytes(bdev))
191 /* Invalidate the page cache, including dirty pages */
192 filemap_invalidate_lock(inode->i_mapping);
193 err = truncate_bdev_range(bdev, mode, start, end);
197 err = blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL,
198 BLKDEV_ZERO_NOUNMAP);
201 filemap_invalidate_unlock(inode->i_mapping);
205 static int put_ushort(unsigned short __user *argp, unsigned short val)
207 return put_user(val, argp);
210 static int put_int(int __user *argp, int val)
212 return put_user(val, argp);
215 static int put_uint(unsigned int __user *argp, unsigned int val)
217 return put_user(val, argp);
220 static int put_long(long __user *argp, long val)
222 return put_user(val, argp);
225 static int put_ulong(unsigned long __user *argp, unsigned long val)
227 return put_user(val, argp);
230 static int put_u64(u64 __user *argp, u64 val)
232 return put_user(val, argp);
236 static int compat_put_long(compat_long_t __user *argp, long val)
238 return put_user(val, argp);
241 static int compat_put_ulong(compat_ulong_t __user *argp, compat_ulong_t val)
243 return put_user(val, argp);
249 * This is the equivalent of compat_ptr_ioctl(), to be used by block
250 * drivers that implement only commands that are completely compatible
251 * between 32-bit and 64-bit user space
253 int blkdev_compat_ptr_ioctl(struct block_device *bdev, blk_mode_t mode,
254 unsigned cmd, unsigned long arg)
256 struct gendisk *disk = bdev->bd_disk;
258 if (disk->fops->ioctl)
259 return disk->fops->ioctl(bdev, mode, cmd,
260 (unsigned long)compat_ptr(arg));
264 EXPORT_SYMBOL(blkdev_compat_ptr_ioctl);
267 static bool blkdev_pr_allowed(struct block_device *bdev, blk_mode_t mode)
269 /* no sense to make reservations for partitions */
270 if (bdev_is_partition(bdev))
273 if (capable(CAP_SYS_ADMIN))
276 * Only allow unprivileged reservations if the file descriptor is open
279 return mode & BLK_OPEN_WRITE;
282 static int blkdev_pr_register(struct block_device *bdev, blk_mode_t mode,
283 struct pr_registration __user *arg)
285 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
286 struct pr_registration reg;
288 if (!blkdev_pr_allowed(bdev, mode))
290 if (!ops || !ops->pr_register)
292 if (copy_from_user(®, arg, sizeof(reg)))
295 if (reg.flags & ~PR_FL_IGNORE_KEY)
297 return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags);
300 static int blkdev_pr_reserve(struct block_device *bdev, blk_mode_t mode,
301 struct pr_reservation __user *arg)
303 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
304 struct pr_reservation rsv;
306 if (!blkdev_pr_allowed(bdev, mode))
308 if (!ops || !ops->pr_reserve)
310 if (copy_from_user(&rsv, arg, sizeof(rsv)))
313 if (rsv.flags & ~PR_FL_IGNORE_KEY)
315 return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags);
318 static int blkdev_pr_release(struct block_device *bdev, blk_mode_t mode,
319 struct pr_reservation __user *arg)
321 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
322 struct pr_reservation rsv;
324 if (!blkdev_pr_allowed(bdev, mode))
326 if (!ops || !ops->pr_release)
328 if (copy_from_user(&rsv, arg, sizeof(rsv)))
333 return ops->pr_release(bdev, rsv.key, rsv.type);
336 static int blkdev_pr_preempt(struct block_device *bdev, blk_mode_t mode,
337 struct pr_preempt __user *arg, bool abort)
339 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
342 if (!blkdev_pr_allowed(bdev, mode))
344 if (!ops || !ops->pr_preempt)
346 if (copy_from_user(&p, arg, sizeof(p)))
351 return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort);
354 static int blkdev_pr_clear(struct block_device *bdev, blk_mode_t mode,
355 struct pr_clear __user *arg)
357 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
360 if (!blkdev_pr_allowed(bdev, mode))
362 if (!ops || !ops->pr_clear)
364 if (copy_from_user(&c, arg, sizeof(c)))
369 return ops->pr_clear(bdev, c.key);
372 static int blkdev_flushbuf(struct block_device *bdev, unsigned cmd,
375 if (!capable(CAP_SYS_ADMIN))
378 mutex_lock(&bdev->bd_holder_lock);
379 if (bdev->bd_holder_ops && bdev->bd_holder_ops->sync)
380 bdev->bd_holder_ops->sync(bdev);
382 mutex_unlock(&bdev->bd_holder_lock);
386 invalidate_bdev(bdev);
390 static int blkdev_roset(struct block_device *bdev, unsigned cmd,
395 if (!capable(CAP_SYS_ADMIN))
398 if (get_user(n, (int __user *)arg))
400 if (bdev->bd_disk->fops->set_read_only) {
401 ret = bdev->bd_disk->fops->set_read_only(bdev, n);
405 bdev->bd_read_only = n;
409 static int blkdev_getgeo(struct block_device *bdev,
410 struct hd_geometry __user *argp)
412 struct gendisk *disk = bdev->bd_disk;
413 struct hd_geometry geo;
418 if (!disk->fops->getgeo)
422 * We need to set the startsect first, the driver may
423 * want to override it.
425 memset(&geo, 0, sizeof(geo));
426 geo.start = get_start_sect(bdev);
427 ret = disk->fops->getgeo(bdev, &geo);
430 if (copy_to_user(argp, &geo, sizeof(geo)))
436 struct compat_hd_geometry {
438 unsigned char sectors;
439 unsigned short cylinders;
443 static int compat_hdio_getgeo(struct block_device *bdev,
444 struct compat_hd_geometry __user *ugeo)
446 struct gendisk *disk = bdev->bd_disk;
447 struct hd_geometry geo;
452 if (!disk->fops->getgeo)
455 memset(&geo, 0, sizeof(geo));
457 * We need to set the startsect first, the driver may
458 * want to override it.
460 geo.start = get_start_sect(bdev);
461 ret = disk->fops->getgeo(bdev, &geo);
465 ret = copy_to_user(ugeo, &geo, 4);
466 ret |= put_user(geo.start, &ugeo->start);
474 /* set the logical block size */
475 static int blkdev_bszset(struct block_device *bdev, blk_mode_t mode,
481 if (!capable(CAP_SYS_ADMIN))
485 if (get_user(n, argp))
488 if (mode & BLK_OPEN_EXCL)
489 return set_blocksize(bdev, n);
491 file = bdev_file_open_by_dev(bdev->bd_dev, mode, &bdev, NULL);
494 ret = set_blocksize(bdev, n);
500 * Common commands that are handled the same way on native and compat
501 * user space. Note the separate arg/argp parameters that are needed
502 * to deal with the compat_ptr() conversion.
504 static int blkdev_common_ioctl(struct block_device *bdev, blk_mode_t mode,
505 unsigned int cmd, unsigned long arg,
508 unsigned int max_sectors;
512 return blkdev_flushbuf(bdev, cmd, arg);
514 return blkdev_roset(bdev, cmd, arg);
516 return blk_ioctl_discard(bdev, mode, arg);
518 return blk_ioctl_secure_erase(bdev, mode, argp);
520 return blk_ioctl_zeroout(bdev, mode, arg);
522 return put_u64(argp, bdev->bd_disk->diskseq);
524 return blkdev_report_zones_ioctl(bdev, cmd, arg);
529 return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg);
531 return put_uint(argp, bdev_zone_sectors(bdev));
533 return put_uint(argp, bdev_nr_zones(bdev));
535 return put_int(argp, bdev_read_only(bdev) != 0);
536 case BLKSSZGET: /* get block device logical block size */
537 return put_int(argp, bdev_logical_block_size(bdev));
538 case BLKPBSZGET: /* get block device physical block size */
539 return put_uint(argp, bdev_physical_block_size(bdev));
541 return put_uint(argp, bdev_io_min(bdev));
543 return put_uint(argp, bdev_io_opt(bdev));
545 return put_int(argp, bdev_alignment_offset(bdev));
546 case BLKDISCARDZEROES:
547 return put_uint(argp, 0);
549 max_sectors = min_t(unsigned int, USHRT_MAX,
550 queue_max_sectors(bdev_get_queue(bdev)));
551 return put_ushort(argp, max_sectors);
553 return put_ushort(argp, !bdev_nonrot(bdev));
556 if(!capable(CAP_SYS_ADMIN))
558 bdev->bd_disk->bdi->ra_pages = (arg * 512) / PAGE_SIZE;
561 if (!capable(CAP_SYS_ADMIN))
563 if (bdev_is_partition(bdev))
565 return disk_scan_partitions(bdev->bd_disk, mode);
568 case BLKTRACETEARDOWN:
569 return blk_trace_ioctl(bdev, cmd, argp);
570 case IOC_PR_REGISTER:
571 return blkdev_pr_register(bdev, mode, argp);
573 return blkdev_pr_reserve(bdev, mode, argp);
575 return blkdev_pr_release(bdev, mode, argp);
577 return blkdev_pr_preempt(bdev, mode, argp, false);
578 case IOC_PR_PREEMPT_ABORT:
579 return blkdev_pr_preempt(bdev, mode, argp, true);
581 return blkdev_pr_clear(bdev, mode, argp);
588 * Always keep this in sync with compat_blkdev_ioctl()
589 * to handle all incompatible commands in both functions.
591 * New commands must be compatible and go into blkdev_common_ioctl
593 long blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
595 struct block_device *bdev = I_BDEV(file->f_mapping->host);
596 void __user *argp = (void __user *)arg;
597 blk_mode_t mode = file_to_blk_mode(file);
601 /* These need separate implementations for the data structure */
603 return blkdev_getgeo(bdev, argp);
605 return blkpg_ioctl(bdev, argp);
607 /* Compat mode returns 32-bit data instead of 'long' */
612 return put_long(argp,
613 (bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512);
615 if (bdev_nr_sectors(bdev) > ~0UL)
617 return put_ulong(argp, bdev_nr_sectors(bdev));
619 /* The data is compatible, but the command number is different */
620 case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
621 return put_int(argp, block_size(bdev));
623 return blkdev_bszset(bdev, mode, argp);
625 return put_u64(argp, bdev_nr_bytes(bdev));
627 /* Incompatible alignment on i386 */
629 return blk_trace_ioctl(bdev, cmd, argp);
634 ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
635 if (ret != -ENOIOCTLCMD)
638 if (!bdev->bd_disk->fops->ioctl)
640 return bdev->bd_disk->fops->ioctl(bdev, mode, cmd, arg);
645 #define BLKBSZGET_32 _IOR(0x12, 112, int)
646 #define BLKBSZSET_32 _IOW(0x12, 113, int)
647 #define BLKGETSIZE64_32 _IOR(0x12, 114, int)
649 /* Most of the generic ioctls are handled in the normal fallback path.
650 This assumes the blkdev's low level compat_ioctl always returns
651 ENOIOCTLCMD for unknown ioctls. */
652 long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
655 void __user *argp = compat_ptr(arg);
656 struct block_device *bdev = I_BDEV(file->f_mapping->host);
657 struct gendisk *disk = bdev->bd_disk;
658 blk_mode_t mode = file_to_blk_mode(file);
661 /* These need separate implementations for the data structure */
663 return compat_hdio_getgeo(bdev, argp);
665 return compat_blkpg_ioctl(bdev, argp);
667 /* Compat mode returns 32-bit data instead of 'long' */
672 return compat_put_long(argp,
673 (bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512);
675 if (bdev_nr_sectors(bdev) > ~(compat_ulong_t)0)
677 return compat_put_ulong(argp, bdev_nr_sectors(bdev));
679 /* The data is compatible, but the command number is different */
680 case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
681 return put_int(argp, bdev_logical_block_size(bdev));
683 return blkdev_bszset(bdev, mode, argp);
684 case BLKGETSIZE64_32:
685 return put_u64(argp, bdev_nr_bytes(bdev));
687 /* Incompatible alignment on i386 */
688 case BLKTRACESETUP32:
689 return blk_trace_ioctl(bdev, cmd, argp);
694 ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
695 if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
696 ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);