mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-15 00:04:15 +08:00
30c0702246
This commit is a fix for Linux 4.9-rc1.
In former commit, a function call of compatibility layer for ALSA sequencer
core was obsoleted by an alternative. Although, the alternative gets a
pointer to kernel stack due to mis-programming. As a result, ALSA sequencer
core unexpectedly refers over kernel stack.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Fixes: 8ce8eb601c ("ALSA: seq: add an alternative way to handle ioctl requests")
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
137 lines
4.6 KiB
C
137 lines
4.6 KiB
C
/*
|
|
* 32bit -> 64bit ioctl wrapper for sequencer 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 seq.c */
|
|
|
|
#include <linux/compat.h>
|
|
#include <linux/slab.h>
|
|
|
|
struct snd_seq_port_info32 {
|
|
struct snd_seq_addr addr; /* client/port numbers */
|
|
char name[64]; /* port name */
|
|
|
|
u32 capability; /* port capability bits */
|
|
u32 type; /* port type bits */
|
|
s32 midi_channels; /* channels per MIDI port */
|
|
s32 midi_voices; /* voices per MIDI port */
|
|
s32 synth_voices; /* voices per SYNTH port */
|
|
|
|
s32 read_use; /* R/O: subscribers for output (from this port) */
|
|
s32 write_use; /* R/O: subscribers for input (to this port) */
|
|
|
|
u32 kernel; /* reserved for kernel use (must be NULL) */
|
|
u32 flags; /* misc. conditioning */
|
|
unsigned char time_queue; /* queue # for timestamping */
|
|
char reserved[59]; /* for future use */
|
|
};
|
|
|
|
static int snd_seq_call_port_info_ioctl(struct snd_seq_client *client, unsigned int cmd,
|
|
struct snd_seq_port_info32 __user *data32)
|
|
{
|
|
int err = -EFAULT;
|
|
struct snd_seq_port_info *data;
|
|
|
|
data = kmalloc(sizeof(*data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
if (copy_from_user(data, data32, sizeof(*data32)) ||
|
|
get_user(data->flags, &data32->flags) ||
|
|
get_user(data->time_queue, &data32->time_queue))
|
|
goto error;
|
|
data->kernel = NULL;
|
|
|
|
err = snd_seq_kernel_client_ctl(client->number, cmd, data);
|
|
if (err < 0)
|
|
goto error;
|
|
|
|
if (copy_to_user(data32, data, sizeof(*data32)) ||
|
|
put_user(data->flags, &data32->flags) ||
|
|
put_user(data->time_queue, &data32->time_queue))
|
|
err = -EFAULT;
|
|
|
|
error:
|
|
kfree(data);
|
|
return err;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
*/
|
|
|
|
enum {
|
|
SNDRV_SEQ_IOCTL_CREATE_PORT32 = _IOWR('S', 0x20, struct snd_seq_port_info32),
|
|
SNDRV_SEQ_IOCTL_DELETE_PORT32 = _IOW ('S', 0x21, struct snd_seq_port_info32),
|
|
SNDRV_SEQ_IOCTL_GET_PORT_INFO32 = _IOWR('S', 0x22, struct snd_seq_port_info32),
|
|
SNDRV_SEQ_IOCTL_SET_PORT_INFO32 = _IOW ('S', 0x23, struct snd_seq_port_info32),
|
|
SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT32 = _IOWR('S', 0x52, struct snd_seq_port_info32),
|
|
};
|
|
|
|
static long snd_seq_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct snd_seq_client *client = file->private_data;
|
|
void __user *argp = compat_ptr(arg);
|
|
|
|
if (snd_BUG_ON(!client))
|
|
return -ENXIO;
|
|
|
|
switch (cmd) {
|
|
case SNDRV_SEQ_IOCTL_PVERSION:
|
|
case SNDRV_SEQ_IOCTL_CLIENT_ID:
|
|
case SNDRV_SEQ_IOCTL_SYSTEM_INFO:
|
|
case SNDRV_SEQ_IOCTL_GET_CLIENT_INFO:
|
|
case SNDRV_SEQ_IOCTL_SET_CLIENT_INFO:
|
|
case SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT:
|
|
case SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT:
|
|
case SNDRV_SEQ_IOCTL_CREATE_QUEUE:
|
|
case SNDRV_SEQ_IOCTL_DELETE_QUEUE:
|
|
case SNDRV_SEQ_IOCTL_GET_QUEUE_INFO:
|
|
case SNDRV_SEQ_IOCTL_SET_QUEUE_INFO:
|
|
case SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE:
|
|
case SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS:
|
|
case SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO:
|
|
case SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO:
|
|
case SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER:
|
|
case SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER:
|
|
case SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT:
|
|
case SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT:
|
|
case SNDRV_SEQ_IOCTL_GET_CLIENT_POOL:
|
|
case SNDRV_SEQ_IOCTL_SET_CLIENT_POOL:
|
|
case SNDRV_SEQ_IOCTL_REMOVE_EVENTS:
|
|
case SNDRV_SEQ_IOCTL_QUERY_SUBS:
|
|
case SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION:
|
|
case SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT:
|
|
case SNDRV_SEQ_IOCTL_RUNNING_MODE:
|
|
return snd_seq_ioctl(file, cmd, arg);
|
|
case SNDRV_SEQ_IOCTL_CREATE_PORT32:
|
|
return snd_seq_call_port_info_ioctl(client, SNDRV_SEQ_IOCTL_CREATE_PORT, argp);
|
|
case SNDRV_SEQ_IOCTL_DELETE_PORT32:
|
|
return snd_seq_call_port_info_ioctl(client, SNDRV_SEQ_IOCTL_DELETE_PORT, argp);
|
|
case SNDRV_SEQ_IOCTL_GET_PORT_INFO32:
|
|
return snd_seq_call_port_info_ioctl(client, SNDRV_SEQ_IOCTL_GET_PORT_INFO, argp);
|
|
case SNDRV_SEQ_IOCTL_SET_PORT_INFO32:
|
|
return snd_seq_call_port_info_ioctl(client, SNDRV_SEQ_IOCTL_SET_PORT_INFO, argp);
|
|
case SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT32:
|
|
return snd_seq_call_port_info_ioctl(client, SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, argp);
|
|
}
|
|
return -ENOIOCTLCMD;
|
|
}
|