--- /dev/null
+/*
+ * compat ioctls for control API
+ *
+ * Copyright (c) by Takashi Iwai <tiwai@suse.de>
+ *
+ * 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
+ */
+
+/* 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;
+
+ snd_power_lock(ctl->card);
+ err = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0);
+ if (err >= 0)
+ err = snd_ctl_elem_info(ctl, data);
+ snd_power_unlock(ctl->card);
+
+ 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];
+};
+
+
+/* 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 -ENXIO;
+ }
+ 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,
+ struct snd_ctl_elem_value32 __user *data32,
+ int *typep, int *countp)
+{
+ 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++) {
+ int val;
+ if (get_user(val, &data32->value.integer[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,
+ data32->value.data, size))
+ return -EFAULT;
+ }
+
+ *typep = type;
+ *countp = count;
+ return 0;
+}
+
+/* restore the value to 32bit */
+static int copy_ctl_value_to_user(struct snd_ctl_elem_value32 __user *data32,
+ 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++) {
+ int val;
+ val = data->value.integer.value[i];
+ if (put_user(val, &data32->value.integer[i]))
+ return -EFAULT;
+ }
+ } else {
+ size = get_elem_size(type, count);
+ if (copy_to_user(data32->value.data,
+ data->value.bytes.data, size))
+ return -EFAULT;
+ }
+ return 0;
+}
+
+static int snd_ctl_elem_read_user_compat(struct snd_card *card,
+ struct snd_ctl_elem_value32 __user *data32)
+{
+ struct snd_ctl_elem_value *data;
+ int err, type, count;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (data == NULL)
+ return -ENOMEM;
+
+ if ((err = copy_ctl_value_from_user(card, data, data32, &type, &count)) < 0)
+ goto error;
+
+ snd_power_lock(card);
+ err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
+ if (err >= 0)
+ err = snd_ctl_elem_read(card, data);
+ snd_power_unlock(card);
+ if (err >= 0)
+ err = copy_ctl_value_to_user(data32, data, type, count);
+ error:
+ kfree(data);
+ return err;
+}
+
+static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file,
+ struct snd_ctl_elem_value32 __user *data32)
+{
+ 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;
+
+ if ((err = copy_ctl_value_from_user(card, data, data32, &type, &count)) < 0)
+ goto error;
+
+ snd_power_lock(card);
+ err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
+ if (err >= 0)
+ err = snd_ctl_elem_write(card, file, data);
+ snd_power_unlock(card);
+ if (err >= 0)
+ err = copy_ctl_value_to_user(data32, data, type, count);
+ error:
+ kfree(data);
+ return err;
+}
+
+/* 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) ||
+ get_user(data->type, &data32->type))
+ 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),
+};
+
+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);
+ }
+
+ 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;
+}
Code Review / kvmfornfv.git / blobdiff