// SPDX-License-Identifier: GPL-2.0-or-later
/*
* compat ioctls for control API
*
* Copyright (c) by Takashi Iwai <[email protected]>
*/
/* 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];
} __packed;
static int snd_ctl_elem_info_compat(struct snd_ctl_file *ctl,
struct snd_ctl_elem_info32 __user *data32)
{
struct snd_card *card = ctl->card;
struct snd_ctl_elem_info *data __free(kfree) = NULL;
int err;
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (! data)
return -ENOMEM;
/* copy id */
if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
return -EFAULT;
/* we need to copy the item index.
* hope this doesn't break anything..
*/
if (get_user(data->value.enumerated.item, &data32->value.enumerated.item))
return -EFAULT;
err = snd_power_ref_and_wait(card);
if (err < 0)
return err;
err = snd_ctl_elem_info(ctl, data);
snd_power_unref(card);
if (err < 0)
return err;
/* restore info to 32bit */
/* 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)))
return -EFAULT;
if (put_user(data->owner, &data32->owner))
return -EFAULT;
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))
return -EFAULT;
break;
case SNDRV_CTL_ELEM_TYPE_INTEGER64:
if (copy_to_user(&data32->value.integer64,
&data->value.integer64,
sizeof(data->value.integer64)))
return -EFAULT;
break;
case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
if (copy_to_user(&data32->value.enumerated,
&data->value.enumerated,
sizeof(data->value.enumerated)))
return -EFAULT;
break;
default:
break;
}
return 0;
}
/* 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_ABI
/* 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_ABI */
/* 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 __free(kfree) = NULL;
int err;
guard(rwsem_read)(&card->controls_rwsem);
kctl = snd_ctl_find_id(card, id);
if (!kctl)
return -ENOENT;
info = kzalloc(sizeof(*info), GFP_KERNEL);
if (info == NULL)
return -ENOMEM;
info->id = *id;
err = kctl->info(kctl, info);
if (err >= 0) {
err = info->type;
*countp = info->count;
}
return err;
}
static int get_elem_size(snd_ctl_elem_type_t 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 == (__force int)SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
type == (__force int)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((__force snd_ctl_elem_type_t)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 == (__force int)SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
type == (__force int)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((__force snd_ctl_elem_type_t)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 __free(kfree) = NULL;
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)
return err;
err = snd_ctl_elem_read(card, data);
if (err < 0)
return err;
return copy_ctl_value_to_user(userdata, valuep, data, type, count);
}
static int ctl_elem_read_user(struct snd_card *card,
void __user *userdata, void __user *valuep)
{
int err;
err = snd_power_ref_and_wait(card);
if (err < 0)
return err;
err = __ctl_elem_read_user(card, userdata, valuep);
snd_power_unref(card);
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 __free(kfree) = NULL;
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)
return err;
err = snd_ctl_elem_write(card, file, data);
if (err < 0)
return err;
return copy_ctl_value_to_user(userdata, valuep, data, type, count);
}
static int ctl_elem_write_user(struct snd_ctl_file *file,
void __user *userdata, void __user *valuep)
{
struct snd_card *card = file->card;
int err;
err = snd_power_ref_and_wait(card);
if (err < 0)
return err;
err = __ctl_elem_write_user(file, userdata, valuep);
snd_power_unref(card);
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_ABI
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_ABI */
/* 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 __free(kfree) = NULL;
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (! data)
return -ENOMEM;
/* 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)))
return -EFAULT;
if (get_user(data->owner, &data32->owner))
return -EFAULT;
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))
return -EFAULT;
break;
case SNDRV_CTL_ELEM_TYPE_INTEGER64:
if (copy_from_user(&data->value.integer64,
&data32->value.integer64,
sizeof(data->value.integer64)))
return -EFAULT;
break;
case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
if (copy_from_user(&data->value.enumerated,
&data32->value.enumerated,
sizeof(data->value.enumerated)))
return -EFAULT;
data->value.enumerated.names_ptr =
(uintptr_t)compat_ptr(data->value.enumerated.names_ptr);
break;
default:
break;
}
return snd_ctl_elem_add(file, data, replace);
}
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_ABI
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_ABI */
};
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_ABI
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_ABI */
}
guard(rwsem_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)
return err;
}
}
return -ENOIOCTLCMD;
}
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