[mirror_ubuntu-jammy-kernel.git] / sound / core / control_compat.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * compat ioctls for control API
 *
 *   Copyright (c) by Takashi Iwai <tiwai@suse.de>
 */

/* this file included from control.c */

#include <linux/compat.h>
#include <linux/slab.h>

struct snd_ctl_elem_list32 {
	u32 offset;
	u32 space;
	u32 used;
	u32 count;
	u32 pids;
	unsigned char reserved[50];
} /* don't set packed attribute here */;

static int snd_ctl_elem_list_compat(struct snd_card *card,
				    struct snd_ctl_elem_list32 __user *data32)
{
	struct snd_ctl_elem_list data = {};
	compat_caddr_t ptr;
	int err;

	/* offset, space, used, count */
	if (copy_from_user(&data, data32, 4 * sizeof(u32)))
		return -EFAULT;
	/* pids */
	if (get_user(ptr, &data32->pids))
		return -EFAULT;
	data.pids = compat_ptr(ptr);
	err = snd_ctl_elem_list(card, &data);
	if (err < 0)
		return err;
	/* copy the result */
	if (copy_to_user(data32, &data, 4 * sizeof(u32)))
		return -EFAULT;
	return 0;
}

/*
 * control element info
 * it uses union, so the things are not easy..
 */

struct snd_ctl_elem_info32 {
	struct snd_ctl_elem_id id; // the size of struct is same
	s32 type;
	u32 access;
	u32 count;
	s32 owner;
	union {
		struct {
			s32 min;
			s32 max;
			s32 step;
		} integer;
		struct {
			u64 min;
			u64 max;
			u64 step;
		} integer64;
		struct {
			u32 items;
			u32 item;
			char name[64];
			u64 names_ptr;
			u32 names_length;
		} enumerated;
		unsigned char reserved[128];
	} value;
	unsigned char reserved[64];
} __attribute__((packed));

static int snd_ctl_elem_info_compat(struct snd_ctl_file *ctl,
				    struct snd_ctl_elem_info32 __user *data32)
{
	struct snd_ctl_elem_info *data;
	int err;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (! data)
		return -ENOMEM;

	err = -EFAULT;
	/* copy id */
	if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
		goto error;
	/* we need to copy the item index.
	 * hope this doesn't break anything..
	 */
	if (get_user(data->value.enumerated.item, &data32->value.enumerated.item))
		goto error;

	err = snd_ctl_elem_info(ctl, data);
	if (err < 0)
		goto error;
	/* restore info to 32bit */
	err = -EFAULT;
	/* id, type, access, count */
	if (copy_to_user(&data32->id, &data->id, sizeof(data->id)) ||
	    copy_to_user(&data32->type, &data->type, 3 * sizeof(u32)))
		goto error;
	if (put_user(data->owner, &data32->owner))
		goto error;
	switch (data->type) {
	case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
	case SNDRV_CTL_ELEM_TYPE_INTEGER:
		if (put_user(data->value.integer.min, &data32->value.integer.min) ||
		    put_user(data->value.integer.max, &data32->value.integer.max) ||
		    put_user(data->value.integer.step, &data32->value.integer.step))
			goto error;
		break;
	case SNDRV_CTL_ELEM_TYPE_INTEGER64:
		if (copy_to_user(&data32->value.integer64,
				 &data->value.integer64,
				 sizeof(data->value.integer64)))
			goto error;
		break;
	case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
		if (copy_to_user(&data32->value.enumerated,
				 &data->value.enumerated,
				 sizeof(data->value.enumerated)))
			goto error;
		break;
	default:
		break;
	}
	err = 0;
 error:
	kfree(data);
	return err;
}

/* read / write */
struct snd_ctl_elem_value32 {
	struct snd_ctl_elem_id id;
	unsigned int indirect;	/* bit-field causes misalignment */
        union {
		s32 integer[128];
		unsigned char data[512];
#ifndef CONFIG_X86_64
		s64 integer64[64];
#endif
        } value;
        unsigned char reserved[128];
};

#ifdef CONFIG_X86_X32
/* x32 has a different alignment for 64bit values from ia32 */
struct snd_ctl_elem_value_x32 {
	struct snd_ctl_elem_id id;
	unsigned int indirect;	/* bit-field causes misalignment */
	union {
		s32 integer[128];
		unsigned char data[512];
		s64 integer64[64];
	} value;
	unsigned char reserved[128];
};
#endif /* CONFIG_X86_X32 */

/* get the value type and count of the control */
static int get_ctl_type(struct snd_card *card, struct snd_ctl_elem_id *id,
			int *countp)
{
	struct snd_kcontrol *kctl;
	struct snd_ctl_elem_info *info;
	int err;

	down_read(&card->controls_rwsem);
	kctl = snd_ctl_find_id(card, id);
	if (! kctl) {
		up_read(&card->controls_rwsem);
		return -ENOENT;
	}
	info = kzalloc(sizeof(*info), GFP_KERNEL);
	if (info == NULL) {
		up_read(&card->controls_rwsem);
		return -ENOMEM;
	}
	info->id = *id;
	err = snd_power_ref_and_wait(card);
	if (!err)
		err = kctl->info(kctl, info);
	snd_power_unref(card);
	up_read(&card->controls_rwsem);
	if (err >= 0) {
		err = info->type;
		*countp = info->count;
	}
	kfree(info);
	return err;
}

static int get_elem_size(int type, int count)
{
	switch (type) {
	case SNDRV_CTL_ELEM_TYPE_INTEGER64:
		return sizeof(s64) * count;
	case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
		return sizeof(int) * count;
	case SNDRV_CTL_ELEM_TYPE_BYTES:
		return 512;
	case SNDRV_CTL_ELEM_TYPE_IEC958:
		return sizeof(struct snd_aes_iec958);
	default:
		return -1;
	}
}

static int copy_ctl_value_from_user(struct snd_card *card,
				    struct snd_ctl_elem_value *data,
				    void __user *userdata,
				    void __user *valuep,
				    int *typep, int *countp)
{
	struct snd_ctl_elem_value32 __user *data32 = userdata;
	int i, type, size;
	int count;
	unsigned int indirect;

	if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
		return -EFAULT;
	if (get_user(indirect, &data32->indirect))
		return -EFAULT;
	if (indirect)
		return -EINVAL;
	type = get_ctl_type(card, &data->id, &count);
	if (type < 0)
		return type;

	if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
	    type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
		for (i = 0; i < count; i++) {
			s32 __user *intp = valuep;
			int val;
			if (get_user(val, &intp[i]))
				return -EFAULT;
			data->value.integer.value[i] = val;
		}
	} else {
		size = get_elem_size(type, count);
		if (size < 0) {
			dev_err(card->dev, "snd_ioctl32_ctl_elem_value: unknown type %d\n", type);
			return -EINVAL;
		}
		if (copy_from_user(data->value.bytes.data, valuep, size))
			return -EFAULT;
	}

	*typep = type;
	*countp = count;
	return 0;
}

/* restore the value to 32bit */
static int copy_ctl_value_to_user(void __user *userdata,
				  void __user *valuep,
				  struct snd_ctl_elem_value *data,
				  int type, int count)
{
	struct snd_ctl_elem_value32 __user *data32 = userdata;
	int i, size;

	if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
	    type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
		for (i = 0; i < count; i++) {
			s32 __user *intp = valuep;
			int val;
			val = data->value.integer.value[i];
			if (put_user(val, &intp[i]))
				return -EFAULT;
		}
	} else {
		size = get_elem_size(type, count);
		if (copy_to_user(valuep, data->value.bytes.data, size))
			return -EFAULT;
	}
	if (copy_to_user(&data32->id, &data->id, sizeof(data32->id)))
		return -EFAULT;
	return 0;
}

static int ctl_elem_read_user(struct snd_card *card,
			      void __user *userdata, void __user *valuep)
{
	struct snd_ctl_elem_value *data;
	int err, type, count;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (data == NULL)
		return -ENOMEM;

	err = copy_ctl_value_from_user(card, data, userdata, valuep,
				       &type, &count);
	if (err < 0)
		goto error;

	err = snd_ctl_elem_read(card, data);
	if (err < 0)
		goto error;
	err = copy_ctl_value_to_user(userdata, valuep, data, type, count);
 error:
	kfree(data);
	return err;
}

static int ctl_elem_write_user(struct snd_ctl_file *file,
			       void __user *userdata, void __user *valuep)
{
	struct snd_ctl_elem_value *data;
	struct snd_card *card = file->card;
	int err, type, count;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (data == NULL)
		return -ENOMEM;

	err = copy_ctl_value_from_user(card, data, userdata, valuep,
				       &type, &count);
	if (err < 0)
		goto error;

	err = snd_ctl_elem_write(card, file, data);
	if (err < 0)
		goto error;
	err = copy_ctl_value_to_user(userdata, valuep, data, type, count);
 error:
	kfree(data);
	return err;
}

static int snd_ctl_elem_read_user_compat(struct snd_card *card,
					 struct snd_ctl_elem_value32 __user *data32)
{
	return ctl_elem_read_user(card, data32, &data32->value);
}

static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file,
					  struct snd_ctl_elem_value32 __user *data32)
{
	return ctl_elem_write_user(file, data32, &data32->value);
}

#ifdef CONFIG_X86_X32
static int snd_ctl_elem_read_user_x32(struct snd_card *card,
				      struct snd_ctl_elem_value_x32 __user *data32)
{
	return ctl_elem_read_user(card, data32, &data32->value);
}

static int snd_ctl_elem_write_user_x32(struct snd_ctl_file *file,
				       struct snd_ctl_elem_value_x32 __user *data32)
{
	return ctl_elem_write_user(file, data32, &data32->value);
}
#endif /* CONFIG_X86_X32 */

/* add or replace a user control */
static int snd_ctl_elem_add_compat(struct snd_ctl_file *file,
				   struct snd_ctl_elem_info32 __user *data32,
				   int replace)
{
	struct snd_ctl_elem_info *data;
	int err;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (! data)
		return -ENOMEM;

	err = -EFAULT;
	/* id, type, access, count */ \
	if (copy_from_user(&data->id, &data32->id, sizeof(data->id)) ||
	    copy_from_user(&data->type, &data32->type, 3 * sizeof(u32)))
		goto error;
	if (get_user(data->owner, &data32->owner))
		goto error;
	switch (data->type) {
	case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
	case SNDRV_CTL_ELEM_TYPE_INTEGER:
		if (get_user(data->value.integer.min, &data32->value.integer.min) ||
		    get_user(data->value.integer.max, &data32->value.integer.max) ||
		    get_user(data->value.integer.step, &data32->value.integer.step))
			goto error;
		break;
	case SNDRV_CTL_ELEM_TYPE_INTEGER64:
		if (copy_from_user(&data->value.integer64,
				   &data32->value.integer64,
				   sizeof(data->value.integer64)))
			goto error;
		break;
	case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
		if (copy_from_user(&data->value.enumerated,
				   &data32->value.enumerated,
				   sizeof(data->value.enumerated)))
			goto error;
		data->value.enumerated.names_ptr =
			(uintptr_t)compat_ptr(data->value.enumerated.names_ptr);
		break;
	default:
		break;
	}
	err = snd_ctl_elem_add(file, data, replace);
 error:
	kfree(data);
	return err;
}  

enum {
	SNDRV_CTL_IOCTL_ELEM_LIST32 = _IOWR('U', 0x10, struct snd_ctl_elem_list32),
	SNDRV_CTL_IOCTL_ELEM_INFO32 = _IOWR('U', 0x11, struct snd_ctl_elem_info32),
	SNDRV_CTL_IOCTL_ELEM_READ32 = _IOWR('U', 0x12, struct snd_ctl_elem_value32),
	SNDRV_CTL_IOCTL_ELEM_WRITE32 = _IOWR('U', 0x13, struct snd_ctl_elem_value32),
	SNDRV_CTL_IOCTL_ELEM_ADD32 = _IOWR('U', 0x17, struct snd_ctl_elem_info32),
	SNDRV_CTL_IOCTL_ELEM_REPLACE32 = _IOWR('U', 0x18, struct snd_ctl_elem_info32),
#ifdef CONFIG_X86_X32
	SNDRV_CTL_IOCTL_ELEM_READ_X32 = _IOWR('U', 0x12, struct snd_ctl_elem_value_x32),
	SNDRV_CTL_IOCTL_ELEM_WRITE_X32 = _IOWR('U', 0x13, struct snd_ctl_elem_value_x32),
#endif /* CONFIG_X86_X32 */
};

static inline long snd_ctl_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
{
	struct snd_ctl_file *ctl;
	struct snd_kctl_ioctl *p;
	void __user *argp = compat_ptr(arg);
	int err;

	ctl = file->private_data;
	if (snd_BUG_ON(!ctl || !ctl->card))
		return -ENXIO;

	switch (cmd) {
	case SNDRV_CTL_IOCTL_PVERSION:
	case SNDRV_CTL_IOCTL_CARD_INFO:
	case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS:
	case SNDRV_CTL_IOCTL_POWER:
	case SNDRV_CTL_IOCTL_POWER_STATE:
	case SNDRV_CTL_IOCTL_ELEM_LOCK:
	case SNDRV_CTL_IOCTL_ELEM_UNLOCK:
	case SNDRV_CTL_IOCTL_ELEM_REMOVE:
	case SNDRV_CTL_IOCTL_TLV_READ:
	case SNDRV_CTL_IOCTL_TLV_WRITE:
	case SNDRV_CTL_IOCTL_TLV_COMMAND:
		return snd_ctl_ioctl(file, cmd, (unsigned long)argp);
	case SNDRV_CTL_IOCTL_ELEM_LIST32:
		return snd_ctl_elem_list_compat(ctl->card, argp);
	case SNDRV_CTL_IOCTL_ELEM_INFO32:
		return snd_ctl_elem_info_compat(ctl, argp);
	case SNDRV_CTL_IOCTL_ELEM_READ32:
		return snd_ctl_elem_read_user_compat(ctl->card, argp);
	case SNDRV_CTL_IOCTL_ELEM_WRITE32:
		return snd_ctl_elem_write_user_compat(ctl, argp);
	case SNDRV_CTL_IOCTL_ELEM_ADD32:
		return snd_ctl_elem_add_compat(ctl, argp, 0);
	case SNDRV_CTL_IOCTL_ELEM_REPLACE32:
		return snd_ctl_elem_add_compat(ctl, argp, 1);
#ifdef CONFIG_X86_X32
	case SNDRV_CTL_IOCTL_ELEM_READ_X32:
		return snd_ctl_elem_read_user_x32(ctl->card, argp);
	case SNDRV_CTL_IOCTL_ELEM_WRITE_X32:
		return snd_ctl_elem_write_user_x32(ctl, argp);
#endif /* CONFIG_X86_X32 */
	}

	down_read(&snd_ioctl_rwsem);
	list_for_each_entry(p, &snd_control_compat_ioctls, list) {
		if (p->fioctl) {
			err = p->fioctl(ctl->card, ctl, cmd, arg);
			if (err != -ENOIOCTLCMD) {
				up_read(&snd_ioctl_rwsem);
				return err;
			}
		}
	}
	up_read(&snd_ioctl_rwsem);
	return -ENOIOCTLCMD;
}
Commit	Line	Data
1a59d1b8	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4 LT	2	/*
	3	* compat ioctls for control API
	4	*
	5	* Copyright (c) by Takashi Iwai <tiwai@suse.de>
1da177e4 LT	6	*/
	7
	8	/* this file included from control.c */
	9
	10	#include <linux/compat.h>
5a0e3ad6	11	#include <linux/slab.h>
1da177e4	12
82e9bae6	13	struct snd_ctl_elem_list32 {
1da177e4 LT	14	u32 offset;
	15	u32 space;
	16	u32 used;
	17	u32 count;
	18	u32 pids;
	19	unsigned char reserved[50];
	20	} /* don't set packed attribute here */;
	21
82e9bae6 TI	22	static int snd_ctl_elem_list_compat(struct snd_card *card,
82e9bae6 TI	23	struct snd_ctl_elem_list32 __user *data32)
1da177e4	24	{
18d122c0	25	struct snd_ctl_elem_list data = {};
1da177e4 LT	26	compat_caddr_t ptr;
	27	int err;
	28
1da177e4	29	/* offset, space, used, count */
18d122c0	30	if (copy_from_user(&data, data32, 4 * sizeof(u32)))
1da177e4 LT	31	return -EFAULT;
1da177e4 LT	32	/* pids */
18d122c0	33	if (get_user(ptr, &data32->pids))
1da177e4	34	return -EFAULT;
18d122c0 AB	35	data.pids = compat_ptr(ptr);
18d122c0 AB	36	err = snd_ctl_elem_list(card, &data);
1da177e4 LT	37	if (err < 0)
	38	return err;
	39	/* copy the result */
18d122c0	40	if (copy_to_user(data32, &data, 4 * sizeof(u32)))
1da177e4 LT	41	return -EFAULT;
	42	return 0;
	43	}
	44
	45	/*
	46	* control element info
	47	* it uses union, so the things are not easy..
	48	*/
	49
82e9bae6 TI	50	struct snd_ctl_elem_info32 {
82e9bae6 TI	51	struct snd_ctl_elem_id id; // the size of struct is same
1da177e4 LT	52	s32 type;
	53	u32 access;
	54	u32 count;
	55	s32 owner;
	56	union {
	57	struct {
	58	s32 min;
	59	s32 max;
	60	s32 step;
	61	} integer;
	62	struct {
	63	u64 min;
	64	u64 max;
	65	u64 step;
	66	} integer64;
	67	struct {
	68	u32 items;
	69	u32 item;
	70	char name[64];
8d448162 CL	71	u64 names_ptr;
8d448162 CL	72	u32 names_length;
1da177e4 LT	73	} enumerated;
	74	unsigned char reserved[128];
	75	} value;
	76	unsigned char reserved[64];
	77	} __attribute__((packed));
	78
82e9bae6 TI	79	static int snd_ctl_elem_info_compat(struct snd_ctl_file *ctl,
82e9bae6 TI	80	struct snd_ctl_elem_info32 __user *data32)
1da177e4	81	{
82e9bae6	82	struct snd_ctl_elem_info *data;
1da177e4 LT	83	int err;
1da177e4 LT	84
ca2c0966	85	data = kzalloc(sizeof(*data), GFP_KERNEL);
1da177e4 LT	86	if (! data)
	87	return -ENOMEM;
	88
	89	err = -EFAULT;
	90	/* copy id */
	91	if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
	92	goto error;
	93	/* we need to copy the item index.
	94	* hope this doesn't break anything..
	95	*/
	96	if (get_user(data->value.enumerated.item, &data32->value.enumerated.item))
	97	goto error;
64649400	98
7d8e8292	99	err = snd_ctl_elem_info(ctl, data);
1da177e4 LT	100	if (err < 0)
	101	goto error;
	102	/* restore info to 32bit */
	103	err = -EFAULT;
	104	/* id, type, access, count */
	105	if (copy_to_user(&data32->id, &data->id, sizeof(data->id)) \|\|
	106	copy_to_user(&data32->type, &data->type, 3 * sizeof(u32)))
	107	goto error;
	108	if (put_user(data->owner, &data32->owner))
	109	goto error;
	110	switch (data->type) {
	111	case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
	112	case SNDRV_CTL_ELEM_TYPE_INTEGER:
	113	if (put_user(data->value.integer.min, &data32->value.integer.min) \|\|
	114	put_user(data->value.integer.max, &data32->value.integer.max) \|\|
	115	put_user(data->value.integer.step, &data32->value.integer.step))
	116	goto error;
	117	break;
	118	case SNDRV_CTL_ELEM_TYPE_INTEGER64:
	119	if (copy_to_user(&data32->value.integer64,
	120	&data->value.integer64,
	121	sizeof(data->value.integer64)))
	122	goto error;
	123	break;
	124	case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
	125	if (copy_to_user(&data32->value.enumerated,
	126	&data->value.enumerated,
	127	sizeof(data->value.enumerated)))
	128	goto error;
	129	break;
	130	default:
	131	break;
	132	}
	133	err = 0;
	134	error:
	135	kfree(data);
	136	return err;
	137	}
	138
	139	/* read / write */
82e9bae6 TI	140	struct snd_ctl_elem_value32 {
82e9bae6 TI	141	struct snd_ctl_elem_id id;
1da177e4 LT	142	unsigned int indirect; /* bit-field causes misalignment */
	143	union {
	144	s32 integer[128];
	145	unsigned char data[512];
	146	#ifndef CONFIG_X86_64
	147	s64 integer64[64];
	148	#endif
	149	} value;
	150	unsigned char reserved[128];
	151	};
	152
6236d8bb TI	153	#ifdef CONFIG_X86_X32
	154	/* x32 has a different alignment for 64bit values from ia32 */
	155	struct snd_ctl_elem_value_x32 {
	156	struct snd_ctl_elem_id id;
	157	unsigned int indirect; /* bit-field causes misalignment */
	158	union {
	159	s32 integer[128];
	160	unsigned char data[512];
	161	s64 integer64[64];
	162	} value;
	163	unsigned char reserved[128];
	164	};
	165	#endif /* CONFIG_X86_X32 */
1da177e4 LT	166
1da177e4 LT	167	/* get the value type and count of the control */
82e9bae6 TI	168	static int get_ctl_type(struct snd_card card, struct snd_ctl_elem_id id,
82e9bae6 TI	169	int *countp)
1da177e4	170	{
82e9bae6	171	struct snd_kcontrol *kctl;
aa657ca9	172	struct snd_ctl_elem_info *info;
1da177e4 LT	173	int err;
	174
	175	down_read(&card->controls_rwsem);
	176	kctl = snd_ctl_find_id(card, id);
	177	if (! kctl) {
	178	up_read(&card->controls_rwsem);
6f021744	179	return -ENOENT;
1da177e4	180	}
aa657ca9 JK	181	info = kzalloc(sizeof(*info), GFP_KERNEL);
	182	if (info == NULL) {
	183	up_read(&card->controls_rwsem);
	184	return -ENOMEM;
	185	}
	186	info->id = *id;
e94fdbd7 TI	187	err = snd_power_ref_and_wait(card);
	188	if (!err)
	189	err = kctl->info(kctl, info);
	190	snd_power_unref(card);
1da177e4 LT	191	up_read(&card->controls_rwsem);
1da177e4 LT	192	if (err >= 0) {
aa657ca9 JK	193	err = info->type;
aa657ca9 JK	194	*countp = info->count;
1da177e4	195	}
aa657ca9	196	kfree(info);
1da177e4 LT	197	return err;
	198	}
	199
	200	static int get_elem_size(int type, int count)
	201	{
	202	switch (type) {
	203	case SNDRV_CTL_ELEM_TYPE_INTEGER64:
	204	return sizeof(s64) * count;
	205	case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
	206	return sizeof(int) * count;
	207	case SNDRV_CTL_ELEM_TYPE_BYTES:
	208	return 512;
	209	case SNDRV_CTL_ELEM_TYPE_IEC958:
82e9bae6	210	return sizeof(struct snd_aes_iec958);
1da177e4 LT	211	default:
	212	return -1;
	213	}
	214	}
	215
82e9bae6 TI	216	static int copy_ctl_value_from_user(struct snd_card *card,
82e9bae6 TI	217	struct snd_ctl_elem_value *data,
6236d8bb TI	218	void __user *userdata,
6236d8bb TI	219	void __user *valuep,
1da177e4 LT	220	int typep, int countp)
1da177e4 LT	221	{
6236d8bb	222	struct snd_ctl_elem_value32 __user *data32 = userdata;
5050b092	223	int i, type, size;
3f649ab7	224	int count;
1da177e4 LT	225	unsigned int indirect;
	226
	227	if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
	228	return -EFAULT;
	229	if (get_user(indirect, &data32->indirect))
	230	return -EFAULT;
	231	if (indirect)
	232	return -EINVAL;
	233	type = get_ctl_type(card, &data->id, &count);
	234	if (type < 0)
	235	return type;
	236
	237	if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN \|\|
	238	type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
	239	for (i = 0; i < count; i++) {
6236d8bb	240	s32 __user *intp = valuep;
1da177e4	241	int val;
6236d8bb	242	if (get_user(val, &intp[i]))
1da177e4 LT	243	return -EFAULT;
	244	data->value.integer.value[i] = val;
	245	}
	246	} else {
	247	size = get_elem_size(type, count);
	248	if (size < 0) {
bb009457	249	dev_err(card->dev, "snd_ioctl32_ctl_elem_value: unknown type %d\n", type);
1da177e4 LT	250	return -EINVAL;
1da177e4 LT	251	}
6236d8bb	252	if (copy_from_user(data->value.bytes.data, valuep, size))
1da177e4 LT	253	return -EFAULT;
	254	}
	255
	256	*typep = type;
	257	*countp = count;
	258	return 0;
	259	}
	260
	261	/* restore the value to 32bit */
6236d8bb TI	262	static int copy_ctl_value_to_user(void __user *userdata,
6236d8bb TI	263	void __user *valuep,
82e9bae6	264	struct snd_ctl_elem_value *data,
1da177e4 LT	265	int type, int count)
1da177e4 LT	266	{
26e997c9	267	struct snd_ctl_elem_value32 __user *data32 = userdata;
1da177e4 LT	268	int i, size;
	269
	270	if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN \|\|
	271	type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
	272	for (i = 0; i < count; i++) {
6236d8bb	273	s32 __user *intp = valuep;
1da177e4 LT	274	int val;
1da177e4 LT	275	val = data->value.integer.value[i];
6236d8bb	276	if (put_user(val, &intp[i]))
1da177e4 LT	277	return -EFAULT;
	278	}
	279	} else {
	280	size = get_elem_size(type, count);
6236d8bb	281	if (copy_to_user(valuep, data->value.bytes.data, size))
1da177e4 LT	282	return -EFAULT;
1da177e4 LT	283	}
26e997c9 AY	284	if (copy_to_user(&data32->id, &data->id, sizeof(data32->id)))
26e997c9 AY	285	return -EFAULT;
1da177e4 LT	286	return 0;
	287	}
	288
6236d8bb TI	289	static int ctl_elem_read_user(struct snd_card *card,
6236d8bb TI	290	void __user userdata, void __user valuep)
1da177e4	291	{
82e9bae6	292	struct snd_ctl_elem_value *data;
1da177e4 LT	293	int err, type, count;
1da177e4 LT	294
ca2c0966	295	data = kzalloc(sizeof(*data), GFP_KERNEL);
1da177e4 LT	296	if (data == NULL)
	297	return -ENOMEM;
	298
6236d8bb TI	299	err = copy_ctl_value_from_user(card, data, userdata, valuep,
	300	&type, &count);
	301	if (err < 0)
1da177e4	302	goto error;
64649400	303
7d8e8292 TI	304	err = snd_ctl_elem_read(card, data);
	305	if (err < 0)
	306	goto error;
	307	err = copy_ctl_value_to_user(userdata, valuep, data, type, count);
1da177e4 LT	308	error:
	309	kfree(data);
	310	return err;
	311	}
	312
6236d8bb TI	313	static int ctl_elem_write_user(struct snd_ctl_file *file,
6236d8bb TI	314	void __user userdata, void __user valuep)
1da177e4	315	{
82e9bae6	316	struct snd_ctl_elem_value *data;
64649400	317	struct snd_card *card = file->card;
1da177e4 LT	318	int err, type, count;
1da177e4 LT	319
ca2c0966	320	data = kzalloc(sizeof(*data), GFP_KERNEL);
1da177e4 LT	321	if (data == NULL)
	322	return -ENOMEM;
	323
6236d8bb TI	324	err = copy_ctl_value_from_user(card, data, userdata, valuep,
	325	&type, &count);
	326	if (err < 0)
1da177e4	327	goto error;
64649400	328
7d8e8292 TI	329	err = snd_ctl_elem_write(card, file, data);
	330	if (err < 0)
	331	goto error;
	332	err = copy_ctl_value_to_user(userdata, valuep, data, type, count);
1da177e4 LT	333	error:
	334	kfree(data);
	335	return err;
	336	}
	337
6236d8bb TI	338	static int snd_ctl_elem_read_user_compat(struct snd_card *card,
	339	struct snd_ctl_elem_value32 __user *data32)
	340	{
	341	return ctl_elem_read_user(card, data32, &data32->value);
	342	}
	343
	344	static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file,
	345	struct snd_ctl_elem_value32 __user *data32)
	346	{
	347	return ctl_elem_write_user(file, data32, &data32->value);
	348	}
	349
	350	#ifdef CONFIG_X86_X32
	351	static int snd_ctl_elem_read_user_x32(struct snd_card *card,
	352	struct snd_ctl_elem_value_x32 __user *data32)
	353	{
	354	return ctl_elem_read_user(card, data32, &data32->value);
	355	}
	356
	357	static int snd_ctl_elem_write_user_x32(struct snd_ctl_file *file,
	358	struct snd_ctl_elem_value_x32 __user *data32)
	359	{
	360	return ctl_elem_write_user(file, data32, &data32->value);
	361	}
	362	#endif /* CONFIG_X86_X32 */
	363
1da177e4	364	/* add or replace a user control */
82e9bae6 TI	365	static int snd_ctl_elem_add_compat(struct snd_ctl_file *file,
82e9bae6 TI	366	struct snd_ctl_elem_info32 __user *data32,
1da177e4 LT	367	int replace)
1da177e4 LT	368	{
82e9bae6	369	struct snd_ctl_elem_info *data;
1da177e4 LT	370	int err;
1da177e4 LT	371
ca2c0966	372	data = kzalloc(sizeof(*data), GFP_KERNEL);
1da177e4 LT	373	if (! data)
	374	return -ENOMEM;
	375
	376	err = -EFAULT;
	377	/* id, type, access, count */ \
	378	if (copy_from_user(&data->id, &data32->id, sizeof(data->id)) \|\|
	379	copy_from_user(&data->type, &data32->type, 3 * sizeof(u32)))
	380	goto error;
3f12888d	381	if (get_user(data->owner, &data32->owner))
1da177e4 LT	382	goto error;
	383	switch (data->type) {
	384	case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
	385	case SNDRV_CTL_ELEM_TYPE_INTEGER:
	386	if (get_user(data->value.integer.min, &data32->value.integer.min) \|\|
	387	get_user(data->value.integer.max, &data32->value.integer.max) \|\|
	388	get_user(data->value.integer.step, &data32->value.integer.step))
	389	goto error;
	390	break;
	391	case SNDRV_CTL_ELEM_TYPE_INTEGER64:
	392	if (copy_from_user(&data->value.integer64,
	393	&data32->value.integer64,
	394	sizeof(data->value.integer64)))
	395	goto error;
	396	break;
	397	case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
	398	if (copy_from_user(&data->value.enumerated,
	399	&data32->value.enumerated,
	400	sizeof(data->value.enumerated)))
	401	goto error;
8d448162 CL	402	data->value.enumerated.names_ptr =
8d448162 CL	403	(uintptr_t)compat_ptr(data->value.enumerated.names_ptr);
1da177e4 LT	404	break;
	405	default:
	406	break;
	407	}
	408	err = snd_ctl_elem_add(file, data, replace);
	409	error:
	410	kfree(data);
	411	return err;
	412	}
	413
	414	enum {
82e9bae6 TI	415	SNDRV_CTL_IOCTL_ELEM_LIST32 = _IOWR('U', 0x10, struct snd_ctl_elem_list32),
	416	SNDRV_CTL_IOCTL_ELEM_INFO32 = _IOWR('U', 0x11, struct snd_ctl_elem_info32),
	417	SNDRV_CTL_IOCTL_ELEM_READ32 = _IOWR('U', 0x12, struct snd_ctl_elem_value32),
	418	SNDRV_CTL_IOCTL_ELEM_WRITE32 = _IOWR('U', 0x13, struct snd_ctl_elem_value32),
	419	SNDRV_CTL_IOCTL_ELEM_ADD32 = _IOWR('U', 0x17, struct snd_ctl_elem_info32),
	420	SNDRV_CTL_IOCTL_ELEM_REPLACE32 = _IOWR('U', 0x18, struct snd_ctl_elem_info32),
6236d8bb TI	421	#ifdef CONFIG_X86_X32
	422	SNDRV_CTL_IOCTL_ELEM_READ_X32 = _IOWR('U', 0x12, struct snd_ctl_elem_value_x32),
	423	SNDRV_CTL_IOCTL_ELEM_WRITE_X32 = _IOWR('U', 0x13, struct snd_ctl_elem_value_x32),
	424	#endif /* CONFIG_X86_X32 */
1da177e4 LT	425	};
	426
	427	static inline long snd_ctl_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
	428	{
82e9bae6	429	struct snd_ctl_file *ctl;
9244b2c3	430	struct snd_kctl_ioctl *p;
1da177e4 LT	431	void __user *argp = compat_ptr(arg);
	432	int err;
	433
	434	ctl = file->private_data;
7eaa943c TI	435	if (snd_BUG_ON(!ctl \|\| !ctl->card))
7eaa943c TI	436	return -ENXIO;
1da177e4 LT	437
	438	switch (cmd) {
	439	case SNDRV_CTL_IOCTL_PVERSION:
	440	case SNDRV_CTL_IOCTL_CARD_INFO:
	441	case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS:
	442	case SNDRV_CTL_IOCTL_POWER:
	443	case SNDRV_CTL_IOCTL_POWER_STATE:
	444	case SNDRV_CTL_IOCTL_ELEM_LOCK:
	445	case SNDRV_CTL_IOCTL_ELEM_UNLOCK:
2b1181ed TI	446	case SNDRV_CTL_IOCTL_ELEM_REMOVE:
	447	case SNDRV_CTL_IOCTL_TLV_READ:
	448	case SNDRV_CTL_IOCTL_TLV_WRITE:
	449	case SNDRV_CTL_IOCTL_TLV_COMMAND:
1da177e4 LT	450	return snd_ctl_ioctl(file, cmd, (unsigned long)argp);
	451	case SNDRV_CTL_IOCTL_ELEM_LIST32:
	452	return snd_ctl_elem_list_compat(ctl->card, argp);
	453	case SNDRV_CTL_IOCTL_ELEM_INFO32:
	454	return snd_ctl_elem_info_compat(ctl, argp);
	455	case SNDRV_CTL_IOCTL_ELEM_READ32:
	456	return snd_ctl_elem_read_user_compat(ctl->card, argp);
	457	case SNDRV_CTL_IOCTL_ELEM_WRITE32:
	458	return snd_ctl_elem_write_user_compat(ctl, argp);
	459	case SNDRV_CTL_IOCTL_ELEM_ADD32:
	460	return snd_ctl_elem_add_compat(ctl, argp, 0);
	461	case SNDRV_CTL_IOCTL_ELEM_REPLACE32:
	462	return snd_ctl_elem_add_compat(ctl, argp, 1);
6236d8bb TI	463	#ifdef CONFIG_X86_X32
	464	case SNDRV_CTL_IOCTL_ELEM_READ_X32:
	465	return snd_ctl_elem_read_user_x32(ctl->card, argp);
	466	case SNDRV_CTL_IOCTL_ELEM_WRITE_X32:
	467	return snd_ctl_elem_write_user_x32(ctl, argp);
	468	#endif /* CONFIG_X86_X32 */
1da177e4 LT	469	}
	470
	471	down_read(&snd_ioctl_rwsem);
9244b2c3	472	list_for_each_entry(p, &snd_control_compat_ioctls, list) {
1da177e4 LT	473	if (p->fioctl) {
	474	err = p->fioctl(ctl->card, ctl, cmd, arg);
	475	if (err != -ENOIOCTLCMD) {
	476	up_read(&snd_ioctl_rwsem);
	477	return err;
	478	}
	479	}
	480	}
	481	up_read(&snd_ioctl_rwsem);
	482	return -ENOIOCTLCMD;
	483	}