[mirror_ubuntu-bionic-kernel.git] / sound / core / rawmidi_compat.c

/*
 *   32bit -> 64bit ioctl wrapper for raw MIDI 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 rawmidi.c */

#include <linux/compat.h>

struct snd_rawmidi_params32 {
	s32 stream;
	u32 buffer_size;
	u32 avail_min;
	unsigned int no_active_sensing; /* avoid bit-field */
	unsigned char reserved[16];
} __attribute__((packed));

static int snd_rawmidi_ioctl_params_compat(struct snd_rawmidi_file *rfile,
					   struct snd_rawmidi_params32 __user *src)
{
	struct snd_rawmidi_params params;
	unsigned int val;

	if (get_user(params.stream, &src->stream) ||
	    get_user(params.buffer_size, &src->buffer_size) ||
	    get_user(params.avail_min, &src->avail_min) ||
	    get_user(val, &src->no_active_sensing))
		return -EFAULT;
	params.no_active_sensing = val;
	switch (params.stream) {
	case SNDRV_RAWMIDI_STREAM_OUTPUT:
		if (!rfile->output)
			return -EINVAL;
		return snd_rawmidi_output_params(rfile->output, &params);
	case SNDRV_RAWMIDI_STREAM_INPUT:
		if (!rfile->input)
			return -EINVAL;
		return snd_rawmidi_input_params(rfile->input, &params);
	}
	return -EINVAL;
}

struct snd_rawmidi_status32 {
	s32 stream;
	struct compat_timespec tstamp;
	u32 avail;
	u32 xruns;
	unsigned char reserved[16];
} __attribute__((packed));

static int snd_rawmidi_ioctl_status_compat(struct snd_rawmidi_file *rfile,
					   struct snd_rawmidi_status32 __user *src)
{
	int err;
	struct snd_rawmidi_status status;

	if (get_user(status.stream, &src->stream))
		return -EFAULT;

	switch (status.stream) {
	case SNDRV_RAWMIDI_STREAM_OUTPUT:
		if (!rfile->output)
			return -EINVAL;
		err = snd_rawmidi_output_status(rfile->output, &status);
		break;
	case SNDRV_RAWMIDI_STREAM_INPUT:
		if (!rfile->input)
			return -EINVAL;
		err = snd_rawmidi_input_status(rfile->input, &status);
		break;
	default:
		return -EINVAL;
	}
	if (err < 0)
		return err;

	if (compat_put_timespec(&status.tstamp, &src->tstamp) ||
	    put_user(status.avail, &src->avail) ||
	    put_user(status.xruns, &src->xruns))
		return -EFAULT;

	return 0;
}

#ifdef CONFIG_X86_X32
/* X32 ABI has 64bit timespec and 64bit alignment */
struct snd_rawmidi_status_x32 {
	s32 stream;
	u32 rsvd; /* alignment */
	struct timespec tstamp;
	u32 avail;
	u32 xruns;
	unsigned char reserved[16];
} __attribute__((packed));

#define put_timespec(src, dst) copy_to_user(dst, src, sizeof(*dst))

static int snd_rawmidi_ioctl_status_x32(struct snd_rawmidi_file *rfile,
					struct snd_rawmidi_status_x32 __user *src)
{
	int err;
	struct snd_rawmidi_status status;

	if (get_user(status.stream, &src->stream))
		return -EFAULT;

	switch (status.stream) {
	case SNDRV_RAWMIDI_STREAM_OUTPUT:
		if (!rfile->output)
			return -EINVAL;
		err = snd_rawmidi_output_status(rfile->output, &status);
		break;
	case SNDRV_RAWMIDI_STREAM_INPUT:
		if (!rfile->input)
			return -EINVAL;
		err = snd_rawmidi_input_status(rfile->input, &status);
		break;
	default:
		return -EINVAL;
	}
	if (err < 0)
		return err;

	if (put_timespec(&status.tstamp, &src->tstamp) ||
	    put_user(status.avail, &src->avail) ||
	    put_user(status.xruns, &src->xruns))
		return -EFAULT;

	return 0;
}
#endif /* CONFIG_X86_X32 */

enum {
	SNDRV_RAWMIDI_IOCTL_PARAMS32 = _IOWR('W', 0x10, struct snd_rawmidi_params32),
	SNDRV_RAWMIDI_IOCTL_STATUS32 = _IOWR('W', 0x20, struct snd_rawmidi_status32),
#ifdef CONFIG_X86_X32
	SNDRV_RAWMIDI_IOCTL_STATUS_X32 = _IOWR('W', 0x20, struct snd_rawmidi_status_x32),
#endif /* CONFIG_X86_X32 */
};

static long snd_rawmidi_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
{
	struct snd_rawmidi_file *rfile;
	void __user *argp = compat_ptr(arg);

	rfile = file->private_data;
	switch (cmd) {
	case SNDRV_RAWMIDI_IOCTL_PVERSION:
	case SNDRV_RAWMIDI_IOCTL_INFO:
	case SNDRV_RAWMIDI_IOCTL_DROP:
	case SNDRV_RAWMIDI_IOCTL_DRAIN:
		return snd_rawmidi_ioctl(file, cmd, (unsigned long)argp);
	case SNDRV_RAWMIDI_IOCTL_PARAMS32:
		return snd_rawmidi_ioctl_params_compat(rfile, argp);
	case SNDRV_RAWMIDI_IOCTL_STATUS32:
		return snd_rawmidi_ioctl_status_compat(rfile, argp);
#ifdef CONFIG_X86_X32
	case SNDRV_RAWMIDI_IOCTL_STATUS_X32:
		return snd_rawmidi_ioctl_status_x32(rfile, argp);
#endif /* CONFIG_X86_X32 */
	}
	return -ENOIOCTLCMD;
}
Commit	Line	Data
	1	/*
	2	* 32bit -> 64bit ioctl wrapper for raw MIDI API
	3	* Copyright (c) by Takashi Iwai <tiwai@suse.de>
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License as published by
	7	* the Free Software Foundation; either version 2 of the License, or
	8	* (at your option) any later version.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program; if not, write to the Free Software
	17	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	18	*
	19	*/
	20
	21	/* This file included from rawmidi.c */
	22
	23	#include <linux/compat.h>
	24
	25	struct snd_rawmidi_params32 {
	26	s32 stream;
	27	u32 buffer_size;
	28	u32 avail_min;
	29	unsigned int no_active_sensing; /* avoid bit-field */
	30	unsigned char reserved[16];
	31	} __attribute__((packed));
	32
	33	static int snd_rawmidi_ioctl_params_compat(struct snd_rawmidi_file *rfile,
	34	struct snd_rawmidi_params32 __user *src)
	35	{
	36	struct snd_rawmidi_params params;
	37	unsigned int val;
	38
	39	if (get_user(params.stream, &src->stream) \|\|
	40	get_user(params.buffer_size, &src->buffer_size) \|\|
	41	get_user(params.avail_min, &src->avail_min) \|\|
	42	get_user(val, &src->no_active_sensing))
	43	return -EFAULT;
	44	params.no_active_sensing = val;
	45	switch (params.stream) {
	46	case SNDRV_RAWMIDI_STREAM_OUTPUT:
	47	if (!rfile->output)
	48	return -EINVAL;
	49	return snd_rawmidi_output_params(rfile->output, &params);
	50	case SNDRV_RAWMIDI_STREAM_INPUT:
	51	if (!rfile->input)
	52	return -EINVAL;
	53	return snd_rawmidi_input_params(rfile->input, &params);
	54	}
	55	return -EINVAL;
	56	}
	57
	58	struct snd_rawmidi_status32 {
	59	s32 stream;
	60	struct compat_timespec tstamp;
	61	u32 avail;
	62	u32 xruns;
	63	unsigned char reserved[16];
	64	} __attribute__((packed));
	65
	66	static int snd_rawmidi_ioctl_status_compat(struct snd_rawmidi_file *rfile,
	67	struct snd_rawmidi_status32 __user *src)
	68	{
	69	int err;
	70	struct snd_rawmidi_status status;
	71
	72	if (get_user(status.stream, &src->stream))
	73	return -EFAULT;
	74
	75	switch (status.stream) {
	76	case SNDRV_RAWMIDI_STREAM_OUTPUT:
	77	if (!rfile->output)
	78	return -EINVAL;
	79	err = snd_rawmidi_output_status(rfile->output, &status);
	80	break;
	81	case SNDRV_RAWMIDI_STREAM_INPUT:
	82	if (!rfile->input)
	83	return -EINVAL;
	84	err = snd_rawmidi_input_status(rfile->input, &status);
	85	break;
	86	default:
	87	return -EINVAL;
	88	}
	89	if (err < 0)
	90	return err;
	91
	92	if (compat_put_timespec(&status.tstamp, &src->tstamp) \|\|
	93	put_user(status.avail, &src->avail) \|\|
	94	put_user(status.xruns, &src->xruns))
	95	return -EFAULT;
	96
	97	return 0;
	98	}
	99
	100	#ifdef CONFIG_X86_X32
	101	/* X32 ABI has 64bit timespec and 64bit alignment */
	102	struct snd_rawmidi_status_x32 {
	103	s32 stream;
	104	u32 rsvd; /* alignment */
	105	struct timespec tstamp;
	106	u32 avail;
	107	u32 xruns;
	108	unsigned char reserved[16];
	109	} __attribute__((packed));
	110
	111	#define put_timespec(src, dst) copy_to_user(dst, src, sizeof(*dst))
	112
	113	static int snd_rawmidi_ioctl_status_x32(struct snd_rawmidi_file *rfile,
	114	struct snd_rawmidi_status_x32 __user *src)
	115	{
	116	int err;
	117	struct snd_rawmidi_status status;
	118
	119	if (get_user(status.stream, &src->stream))
	120	return -EFAULT;
	121
	122	switch (status.stream) {
	123	case SNDRV_RAWMIDI_STREAM_OUTPUT:
	124	if (!rfile->output)
	125	return -EINVAL;
	126	err = snd_rawmidi_output_status(rfile->output, &status);
	127	break;
	128	case SNDRV_RAWMIDI_STREAM_INPUT:
	129	if (!rfile->input)
	130	return -EINVAL;
	131	err = snd_rawmidi_input_status(rfile->input, &status);
	132	break;
	133	default:
	134	return -EINVAL;
	135	}
	136	if (err < 0)
	137	return err;
	138
	139	if (put_timespec(&status.tstamp, &src->tstamp) \|\|
	140	put_user(status.avail, &src->avail) \|\|
	141	put_user(status.xruns, &src->xruns))
	142	return -EFAULT;
	143
	144	return 0;
	145	}
	146	#endif /* CONFIG_X86_X32 */
	147
	148	enum {
	149	SNDRV_RAWMIDI_IOCTL_PARAMS32 = _IOWR('W', 0x10, struct snd_rawmidi_params32),
	150	SNDRV_RAWMIDI_IOCTL_STATUS32 = _IOWR('W', 0x20, struct snd_rawmidi_status32),
	151	#ifdef CONFIG_X86_X32
	152	SNDRV_RAWMIDI_IOCTL_STATUS_X32 = _IOWR('W', 0x20, struct snd_rawmidi_status_x32),
	153	#endif /* CONFIG_X86_X32 */
	154	};
	155
	156	static long snd_rawmidi_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
	157	{
	158	struct snd_rawmidi_file *rfile;
	159	void __user *argp = compat_ptr(arg);
	160
	161	rfile = file->private_data;
	162	switch (cmd) {
	163	case SNDRV_RAWMIDI_IOCTL_PVERSION:
	164	case SNDRV_RAWMIDI_IOCTL_INFO:
	165	case SNDRV_RAWMIDI_IOCTL_DROP:
	166	case SNDRV_RAWMIDI_IOCTL_DRAIN:
	167	return snd_rawmidi_ioctl(file, cmd, (unsigned long)argp);
	168	case SNDRV_RAWMIDI_IOCTL_PARAMS32:
	169	return snd_rawmidi_ioctl_params_compat(rfile, argp);
	170	case SNDRV_RAWMIDI_IOCTL_STATUS32:
	171	return snd_rawmidi_ioctl_status_compat(rfile, argp);
	172	#ifdef CONFIG_X86_X32
	173	case SNDRV_RAWMIDI_IOCTL_STATUS_X32:
	174	return snd_rawmidi_ioctl_status_x32(rfile, argp);
	175	#endif /* CONFIG_X86_X32 */
	176	}
	177	return -ENOIOCTLCMD;
	178	}