Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 691 insertions, 0 deletions

diff --git a/block/ioctl.c b/block/ioctl.c
new file mode 100644
index 0000000000..d1d8e83912
--- /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(&reg, 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