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linux/sound/core/control_compat.c
Thomas Gleixner 1a59d1b8e0 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version this program is distributed in the
  hope that it will be useful but without any warranty without even
  the implied warranty of merchantability or fitness for a particular
  purpose see the gnu general public license for more details you
  should have received a copy of the gnu general public license along
  with this program if not write to the free software foundation inc
  59 temple place suite 330 boston ma 02111 1307 usa

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1334 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:35 -07:00

489 lines
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// 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 __user *data;
compat_caddr_t ptr;
int err;
data = compat_alloc_user_space(sizeof(*data));
/* offset, space, used, count */
if (copy_in_user(data, data32, 4 * sizeof(u32)))
return -EFAULT;
/* pids */
if (get_user(ptr, &data32->pids) ||
put_user(compat_ptr(ptr), &data->pids))
return -EFAULT;
err = snd_ctl_elem_list(card, data);
if (err < 0)
return err;
/* copy the result */
if (copy_in_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_power_wait(ctl->card, SNDRV_CTL_POWER_D0);
if (err < 0)
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 = kctl->info(kctl, info);
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 uninitialized_var(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)
{
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;
}
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_power_wait(card, SNDRV_CTL_POWER_D0);
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_power_wait(card, SNDRV_CTL_POWER_D0);
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;
}
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