diff options
Diffstat (limited to 'block/ioctl.c')
| -rw-r--r-- | block/ioctl.c | 691 |
1 files changed, 691 insertions, 0 deletions
diff --git a/block/ioctl.c b/block/ioctl.c new file mode 100644 index 000000000..d1d8e8391 --- /dev/null +++ b/block/ioctl.c @@ -0,0 +1,691 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <linux/capability.h> +#include <linux/compat.h> +#include <linux/blkdev.h> +#include <linux/export.h> +#include <linux/gfp.h> +#include <linux/blkpg.h> +#include <linux/hdreg.h> +#include <linux/backing-dev.h> +#include <linux/fs.h> +#include <linux/blktrace_api.h> +#include <linux/pr.h> +#include <linux/uaccess.h> +#include "blk.h" + +static int blkpg_do_ioctl(struct block_device *bdev, + struct blkpg_partition __user *upart, int op) +{ + struct gendisk *disk = bdev->bd_disk; + struct blkpg_partition p; + sector_t start, length; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + if (copy_from_user(&p, upart, sizeof(struct blkpg_partition))) + return -EFAULT; + if (bdev_is_partition(bdev)) + return -EINVAL; + + if (p.pno <= 0) + return -EINVAL; + + if (op == BLKPG_DEL_PARTITION) + return bdev_del_partition(disk, p.pno); + + if (p.start < 0 || p.length <= 0 || p.start + p.length < 0) + return -EINVAL; + /* Check that the partition is aligned to the block size */ + if (!IS_ALIGNED(p.start | p.length, bdev_logical_block_size(bdev))) + return -EINVAL; + + start = p.start >> SECTOR_SHIFT; + length = p.length >> SECTOR_SHIFT; + + switch (op) { + case BLKPG_ADD_PARTITION: + return bdev_add_partition(disk, p.pno, start, length); + case BLKPG_RESIZE_PARTITION: + return bdev_resize_partition(disk, p.pno, start, length); + default: + return -EINVAL; + } +} + +static int blkpg_ioctl(struct block_device *bdev, + struct blkpg_ioctl_arg __user *arg) +{ + struct blkpg_partition __user *udata; + int op; + + if (get_user(op, &arg->op) || get_user(udata, &arg->data)) + return -EFAULT; + + return blkpg_do_ioctl(bdev, udata, op); +} + +#ifdef CONFIG_COMPAT +struct compat_blkpg_ioctl_arg { + compat_int_t op; + compat_int_t flags; + compat_int_t datalen; + compat_caddr_t data; +}; + +static int compat_blkpg_ioctl(struct block_device *bdev, + struct compat_blkpg_ioctl_arg __user *arg) +{ + compat_caddr_t udata; + int op; + + if (get_user(op, &arg->op) || get_user(udata, &arg->data)) + return -EFAULT; + + return blkpg_do_ioctl(bdev, compat_ptr(udata), op); +} +#endif + +static int blk_ioctl_discard(struct block_device *bdev, blk_mode_t mode, + unsigned long arg) +{ + uint64_t range[2]; + uint64_t start, len; + struct inode *inode = bdev->bd_inode; + int err; + + if (!(mode & BLK_OPEN_WRITE)) + return -EBADF; + + if (!bdev_max_discard_sectors(bdev)) + return -EOPNOTSUPP; + + if (copy_from_user(range, (void __user *)arg, sizeof(range))) + return -EFAULT; + + start = range[0]; + len = range[1]; + + if (start & 511) + return -EINVAL; + if (len & 511) + return -EINVAL; + + if (start + len > bdev_nr_bytes(bdev)) + return -EINVAL; + + filemap_invalidate_lock(inode->i_mapping); + err = truncate_bdev_range(bdev, mode, start, start + len - 1); + if (err) + goto fail; + err = blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_KERNEL); +fail: + filemap_invalidate_unlock(inode->i_mapping); + return err; +} + +static int blk_ioctl_secure_erase(struct block_device *bdev, blk_mode_t mode, + void __user *argp) +{ + uint64_t start, len; + uint64_t range[2]; + int err; + + if (!(mode & BLK_OPEN_WRITE)) + return -EBADF; + if (!bdev_max_secure_erase_sectors(bdev)) + return -EOPNOTSUPP; + if (copy_from_user(range, argp, sizeof(range))) + return -EFAULT; + + start = range[0]; + len = range[1]; + if ((start & 511) || (len & 511)) + return -EINVAL; + if (start + len > bdev_nr_bytes(bdev)) + return -EINVAL; + + filemap_invalidate_lock(bdev->bd_inode->i_mapping); + err = truncate_bdev_range(bdev, mode, start, start + len - 1); + if (!err) + err = blkdev_issue_secure_erase(bdev, start >> 9, len >> 9, + GFP_KERNEL); + filemap_invalidate_unlock(bdev->bd_inode->i_mapping); + return err; +} + + +static int blk_ioctl_zeroout(struct block_device *bdev, blk_mode_t mode, + unsigned long arg) +{ + uint64_t range[2]; + uint64_t start, end, len; + struct inode *inode = bdev->bd_inode; + int err; + + if (!(mode & BLK_OPEN_WRITE)) + return -EBADF; + + if (copy_from_user(range, (void __user *)arg, sizeof(range))) + return -EFAULT; + + start = range[0]; + len = range[1]; + end = start + len - 1; + + if (start & 511) + return -EINVAL; + if (len & 511) + return -EINVAL; + if (end >= (uint64_t)bdev_nr_bytes(bdev)) + return -EINVAL; + if (end < start) + return -EINVAL; + + /* Invalidate the page cache, including dirty pages */ + filemap_invalidate_lock(inode->i_mapping); + err = truncate_bdev_range(bdev, mode, start, end); + if (err) + goto fail; + + err = blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL, + BLKDEV_ZERO_NOUNMAP); + +fail: + filemap_invalidate_unlock(inode->i_mapping); + return err; +} + +static int put_ushort(unsigned short __user *argp, unsigned short val) +{ + return put_user(val, argp); +} + +static int put_int(int __user *argp, int val) +{ + return put_user(val, argp); +} + +static int put_uint(unsigned int __user *argp, unsigned int val) +{ + return put_user(val, argp); +} + +static int put_long(long __user *argp, long val) +{ + return put_user(val, argp); +} + +static int put_ulong(unsigned long __user *argp, unsigned long val) +{ + return put_user(val, argp); +} + +static int put_u64(u64 __user *argp, u64 val) +{ + return put_user(val, argp); +} + +#ifdef CONFIG_COMPAT +static int compat_put_long(compat_long_t __user *argp, long val) +{ + return put_user(val, argp); +} + +static int compat_put_ulong(compat_ulong_t __user *argp, compat_ulong_t val) +{ + return put_user(val, argp); +} +#endif + +#ifdef CONFIG_COMPAT +/* + * This is the equivalent of compat_ptr_ioctl(), to be used by block + * drivers that implement only commands that are completely compatible + * between 32-bit and 64-bit user space + */ +int blkdev_compat_ptr_ioctl(struct block_device *bdev, blk_mode_t mode, + unsigned cmd, unsigned long arg) +{ + struct gendisk *disk = bdev->bd_disk; + + if (disk->fops->ioctl) + return disk->fops->ioctl(bdev, mode, cmd, + (unsigned long)compat_ptr(arg)); + + return -ENOIOCTLCMD; +} +EXPORT_SYMBOL(blkdev_compat_ptr_ioctl); +#endif + +static bool blkdev_pr_allowed(struct block_device *bdev, blk_mode_t mode) +{ + /* no sense to make reservations for partitions */ + if (bdev_is_partition(bdev)) + return false; + + if (capable(CAP_SYS_ADMIN)) + return true; + /* + * Only allow unprivileged reservations if the file descriptor is open + * for writing. + */ + return mode & BLK_OPEN_WRITE; +} + +static int blkdev_pr_register(struct block_device *bdev, blk_mode_t mode, + struct pr_registration __user *arg) +{ + const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; + struct pr_registration reg; + + if (!blkdev_pr_allowed(bdev, mode)) + return -EPERM; + if (!ops || !ops->pr_register) + return -EOPNOTSUPP; + if (copy_from_user(®, arg, sizeof(reg))) + return -EFAULT; + + if (reg.flags & ~PR_FL_IGNORE_KEY) + return -EOPNOTSUPP; + return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags); +} + +static int blkdev_pr_reserve(struct block_device *bdev, blk_mode_t mode, + struct pr_reservation __user *arg) +{ + const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; + struct pr_reservation rsv; + + if (!blkdev_pr_allowed(bdev, mode)) + return -EPERM; + if (!ops || !ops->pr_reserve) + return -EOPNOTSUPP; + if (copy_from_user(&rsv, arg, sizeof(rsv))) + return -EFAULT; + + if (rsv.flags & ~PR_FL_IGNORE_KEY) + return -EOPNOTSUPP; + return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags); +} + +static int blkdev_pr_release(struct block_device *bdev, blk_mode_t mode, + struct pr_reservation __user *arg) +{ + const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; + struct pr_reservation rsv; + + if (!blkdev_pr_allowed(bdev, mode)) + return -EPERM; + if (!ops || !ops->pr_release) + return -EOPNOTSUPP; + if (copy_from_user(&rsv, arg, sizeof(rsv))) + return -EFAULT; + + if (rsv.flags) + return -EOPNOTSUPP; + return ops->pr_release(bdev, rsv.key, rsv.type); +} + +static int blkdev_pr_preempt(struct block_device *bdev, blk_mode_t mode, + struct pr_preempt __user *arg, bool abort) +{ + const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; + struct pr_preempt p; + + if (!blkdev_pr_allowed(bdev, mode)) + return -EPERM; + if (!ops || !ops->pr_preempt) + return -EOPNOTSUPP; + if (copy_from_user(&p, arg, sizeof(p))) + return -EFAULT; + + if (p.flags) + return -EOPNOTSUPP; + return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort); +} + +static int blkdev_pr_clear(struct block_device *bdev, blk_mode_t mode, + struct pr_clear __user *arg) +{ + const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; + struct pr_clear c; + + if (!blkdev_pr_allowed(bdev, mode)) + return -EPERM; + if (!ops || !ops->pr_clear) + return -EOPNOTSUPP; + if (copy_from_user(&c, arg, sizeof(c))) + return -EFAULT; + + if (c.flags) + return -EOPNOTSUPP; + return ops->pr_clear(bdev, c.key); +} + +static int blkdev_flushbuf(struct block_device *bdev, unsigned cmd, + unsigned long arg) +{ + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + + mutex_lock(&bdev->bd_holder_lock); + if (bdev->bd_holder_ops && bdev->bd_holder_ops->sync) + bdev->bd_holder_ops->sync(bdev); + else + sync_blockdev(bdev); + mutex_unlock(&bdev->bd_holder_lock); + + invalidate_bdev(bdev); + return 0; +} + +static int blkdev_roset(struct block_device *bdev, unsigned cmd, + unsigned long arg) +{ + int ret, n; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + + if (get_user(n, (int __user *)arg)) + return -EFAULT; + if (bdev->bd_disk->fops->set_read_only) { + ret = bdev->bd_disk->fops->set_read_only(bdev, n); + if (ret) + return ret; + } + bdev->bd_read_only = n; + return 0; +} + +static int blkdev_getgeo(struct block_device *bdev, + struct hd_geometry __user *argp) +{ + struct gendisk *disk = bdev->bd_disk; + struct hd_geometry geo; + int ret; + + if (!argp) + return -EINVAL; + if (!disk->fops->getgeo) + return -ENOTTY; + + /* + * We need to set the startsect first, the driver may + * want to override it. + */ + memset(&geo, 0, sizeof(geo)); + geo.start = get_start_sect(bdev); + ret = disk->fops->getgeo(bdev, &geo); + if (ret) + return ret; + if (copy_to_user(argp, &geo, sizeof(geo))) + return -EFAULT; + return 0; +} + +#ifdef CONFIG_COMPAT +struct compat_hd_geometry { + unsigned char heads; + unsigned char sectors; + unsigned short cylinders; + u32 start; +}; + +static int compat_hdio_getgeo(struct block_device *bdev, + struct compat_hd_geometry __user *ugeo) +{ + struct gendisk *disk = bdev->bd_disk; + struct hd_geometry geo; + int ret; + + if (!ugeo) + return -EINVAL; + if (!disk->fops->getgeo) + return -ENOTTY; + + memset(&geo, 0, sizeof(geo)); + /* + * We need to set the startsect first, the driver may + * want to override it. + */ + geo.start = get_start_sect(bdev); + ret = disk->fops->getgeo(bdev, &geo); + if (ret) + return ret; + + ret = copy_to_user(ugeo, &geo, 4); + ret |= put_user(geo.start, &ugeo->start); + if (ret) + ret = -EFAULT; + + return ret; +} +#endif + +/* set the logical block size */ +static int blkdev_bszset(struct block_device *bdev, blk_mode_t mode, + int __user *argp) +{ + int ret, n; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + if (!argp) + return -EINVAL; + if (get_user(n, argp)) + return -EFAULT; + + if (mode & BLK_OPEN_EXCL) + return set_blocksize(bdev, n); + + if (IS_ERR(blkdev_get_by_dev(bdev->bd_dev, mode, &bdev, NULL))) + return -EBUSY; + ret = set_blocksize(bdev, n); + blkdev_put(bdev, &bdev); + + return ret; +} + +/* + * Common commands that are handled the same way on native and compat + * user space. Note the separate arg/argp parameters that are needed + * to deal with the compat_ptr() conversion. + */ +static int blkdev_common_ioctl(struct block_device *bdev, blk_mode_t mode, + unsigned int cmd, unsigned long arg, + void __user *argp) +{ + unsigned int max_sectors; + + switch (cmd) { + case BLKFLSBUF: + return blkdev_flushbuf(bdev, cmd, arg); + case BLKROSET: + return blkdev_roset(bdev, cmd, arg); + case BLKDISCARD: + return blk_ioctl_discard(bdev, mode, arg); + case BLKSECDISCARD: + return blk_ioctl_secure_erase(bdev, mode, argp); + case BLKZEROOUT: + return blk_ioctl_zeroout(bdev, mode, arg); + case BLKGETDISKSEQ: + return put_u64(argp, bdev->bd_disk->diskseq); + case BLKREPORTZONE: + return blkdev_report_zones_ioctl(bdev, cmd, arg); + case BLKRESETZONE: + case BLKOPENZONE: + case BLKCLOSEZONE: + case BLKFINISHZONE: + return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg); + case BLKGETZONESZ: + return put_uint(argp, bdev_zone_sectors(bdev)); + case BLKGETNRZONES: + return put_uint(argp, bdev_nr_zones(bdev)); + case BLKROGET: + return put_int(argp, bdev_read_only(bdev) != 0); + case BLKSSZGET: /* get block device logical block size */ + return put_int(argp, bdev_logical_block_size(bdev)); + case BLKPBSZGET: /* get block device physical block size */ + return put_uint(argp, bdev_physical_block_size(bdev)); + case BLKIOMIN: + return put_uint(argp, bdev_io_min(bdev)); + case BLKIOOPT: + return put_uint(argp, bdev_io_opt(bdev)); + case BLKALIGNOFF: + return put_int(argp, bdev_alignment_offset(bdev)); + case BLKDISCARDZEROES: + return put_uint(argp, 0); + case BLKSECTGET: + max_sectors = min_t(unsigned int, USHRT_MAX, + queue_max_sectors(bdev_get_queue(bdev))); + return put_ushort(argp, max_sectors); + case BLKROTATIONAL: + return put_ushort(argp, !bdev_nonrot(bdev)); + case BLKRASET: + case BLKFRASET: + if(!capable(CAP_SYS_ADMIN)) + return -EACCES; + bdev->bd_disk->bdi->ra_pages = (arg * 512) / PAGE_SIZE; + return 0; + case BLKRRPART: + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + if (bdev_is_partition(bdev)) + return -EINVAL; + return disk_scan_partitions(bdev->bd_disk, mode); + case BLKTRACESTART: + case BLKTRACESTOP: + case BLKTRACETEARDOWN: + return blk_trace_ioctl(bdev, cmd, argp); + case IOC_PR_REGISTER: + return blkdev_pr_register(bdev, mode, argp); + case IOC_PR_RESERVE: + return blkdev_pr_reserve(bdev, mode, argp); + case IOC_PR_RELEASE: + return blkdev_pr_release(bdev, mode, argp); + case IOC_PR_PREEMPT: + return blkdev_pr_preempt(bdev, mode, argp, false); + case IOC_PR_PREEMPT_ABORT: + return blkdev_pr_preempt(bdev, mode, argp, true); + case IOC_PR_CLEAR: + return blkdev_pr_clear(bdev, mode, argp); + default: + return -ENOIOCTLCMD; + } +} + +/* + * Always keep this in sync with compat_blkdev_ioctl() + * to handle all incompatible commands in both functions. + * + * New commands must be compatible and go into blkdev_common_ioctl + */ +long blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg) +{ + struct block_device *bdev = I_BDEV(file->f_mapping->host); + void __user *argp = (void __user *)arg; + blk_mode_t mode = file_to_blk_mode(file); + int ret; + + switch (cmd) { + /* These need separate implementations for the data structure */ + case HDIO_GETGEO: + return blkdev_getgeo(bdev, argp); + case BLKPG: + return blkpg_ioctl(bdev, argp); + + /* Compat mode returns 32-bit data instead of 'long' */ + case BLKRAGET: + case BLKFRAGET: + if (!argp) + return -EINVAL; + return put_long(argp, + (bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512); + case BLKGETSIZE: + if (bdev_nr_sectors(bdev) > ~0UL) + return -EFBIG; + return put_ulong(argp, bdev_nr_sectors(bdev)); + + /* The data is compatible, but the command number is different */ + case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */ + return put_int(argp, block_size(bdev)); + case BLKBSZSET: + return blkdev_bszset(bdev, mode, argp); + case BLKGETSIZE64: + return put_u64(argp, bdev_nr_bytes(bdev)); + + /* Incompatible alignment on i386 */ + case BLKTRACESETUP: + return blk_trace_ioctl(bdev, cmd, argp); + default: + break; + } + + ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp); + if (ret != -ENOIOCTLCMD) + return ret; + + if (!bdev->bd_disk->fops->ioctl) + return -ENOTTY; + return bdev->bd_disk->fops->ioctl(bdev, mode, cmd, arg); +} + +#ifdef CONFIG_COMPAT + +#define BLKBSZGET_32 _IOR(0x12, 112, int) +#define BLKBSZSET_32 _IOW(0x12, 113, int) +#define BLKGETSIZE64_32 _IOR(0x12, 114, int) + +/* Most of the generic ioctls are handled in the normal fallback path. + This assumes the blkdev's low level compat_ioctl always returns + ENOIOCTLCMD for unknown ioctls. */ +long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg) +{ + int ret; + void __user *argp = compat_ptr(arg); + struct block_device *bdev = I_BDEV(file->f_mapping->host); + struct gendisk *disk = bdev->bd_disk; + blk_mode_t mode = file_to_blk_mode(file); + + switch (cmd) { + /* These need separate implementations for the data structure */ + case HDIO_GETGEO: + return compat_hdio_getgeo(bdev, argp); + case BLKPG: + return compat_blkpg_ioctl(bdev, argp); + + /* Compat mode returns 32-bit data instead of 'long' */ + case BLKRAGET: + case BLKFRAGET: + if (!argp) + return -EINVAL; + return compat_put_long(argp, + (bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512); + case BLKGETSIZE: + if (bdev_nr_sectors(bdev) > ~(compat_ulong_t)0) + return -EFBIG; + return compat_put_ulong(argp, bdev_nr_sectors(bdev)); + + /* The data is compatible, but the command number is different */ + case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */ + return put_int(argp, bdev_logical_block_size(bdev)); + case BLKBSZSET_32: + return blkdev_bszset(bdev, mode, argp); + case BLKGETSIZE64_32: + return put_u64(argp, bdev_nr_bytes(bdev)); + + /* Incompatible alignment on i386 */ + case BLKTRACESETUP32: + return blk_trace_ioctl(bdev, cmd, argp); + default: + break; + } + + ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp); + if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl) + ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg); + + return ret; +} +#endif |