[linux.git] / sound / core / rawmidi_compat.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *   32bit -> 64bit ioctl wrapper for raw MIDI API
 *   Copyright (c) by Takashi Iwai <[email protected]>
 */

/* 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 int mode;
	unsigned char reserved[12];
} __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(params.mode, &src->mode) ||
	    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 compat_snd_rawmidi_status64 {
	s32 stream;
	u8 rsvd[4]; /* alignment */
	s64 tstamp_sec;
	s64 tstamp_nsec;
	u32 avail;
	u32 xruns;
	unsigned char reserved[16];
} __attribute__((packed));

static int snd_rawmidi_ioctl_status_compat64(struct snd_rawmidi_file *rfile,
					     struct compat_snd_rawmidi_status64 __user *src)
{
	int err;
	struct snd_rawmidi_status64 status;
	struct compat_snd_rawmidi_status64 compat_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;

	compat_status = (struct compat_snd_rawmidi_status64) {
		.stream = status.stream,
		.tstamp_sec = status.tstamp_sec,
		.tstamp_nsec = status.tstamp_nsec,
		.avail = status.avail,
		.xruns = status.xruns,
	};

	if (copy_to_user(src, &compat_status, sizeof(*src)))
		return -EFAULT;

	return 0;
}

enum {
	SNDRV_RAWMIDI_IOCTL_PARAMS32 = _IOWR('W', 0x10, struct snd_rawmidi_params32),
	SNDRV_RAWMIDI_IOCTL_STATUS_COMPAT32 = _IOWR('W', 0x20, struct snd_rawmidi_status32),
	SNDRV_RAWMIDI_IOCTL_STATUS_COMPAT64 = _IOWR('W', 0x20, struct compat_snd_rawmidi_status64),
};

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_STATUS_COMPAT32:
		return snd_rawmidi_ioctl_status32(rfile, argp);
	case SNDRV_RAWMIDI_IOCTL_STATUS_COMPAT64:
		return snd_rawmidi_ioctl_status_compat64(rfile, argp);
	}
	return -ENOIOCTLCMD;
}
Commit	Line	Data
1a59d1b8	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4 LT	2	/*
	3	* 32bit -> 64bit ioctl wrapper for raw MIDI API
	4	* Copyright (c) by Takashi Iwai <[email protected]>
1da177e4 LT	5	*/
	6
	7	/* This file included from rawmidi.c */
	8
	9	#include <linux/compat.h>
	10
48c9d417	11	struct snd_rawmidi_params32 {
1da177e4 LT	12	s32 stream;
	13	u32 buffer_size;
	14	u32 avail_min;
	15	unsigned int no_active_sensing; /* avoid bit-field */
08fdced6 DH	16	unsigned int mode;
08fdced6 DH	17	unsigned char reserved[12];
1da177e4 LT	18	} __attribute__((packed));
1da177e4 LT	19
48c9d417 TI	20	static int snd_rawmidi_ioctl_params_compat(struct snd_rawmidi_file *rfile,
48c9d417 TI	21	struct snd_rawmidi_params32 __user *src)
1da177e4	22	{
48c9d417	23	struct snd_rawmidi_params params;
1da177e4 LT	24	unsigned int val;
1da177e4 LT	25
1da177e4 LT	26	if (get_user(params.stream, &src->stream) \|\|
	27	get_user(params.buffer_size, &src->buffer_size) \|\|
	28	get_user(params.avail_min, &src->avail_min) \|\|
08fdced6	29	get_user(params.mode, &src->mode) \|\|
1da177e4 LT	30	get_user(val, &src->no_active_sensing))
	31	return -EFAULT;
	32	params.no_active_sensing = val;
	33	switch (params.stream) {
	34	case SNDRV_RAWMIDI_STREAM_OUTPUT:
8a56ef4f TI	35	if (!rfile->output)
8a56ef4f TI	36	return -EINVAL;
1da177e4 LT	37	return snd_rawmidi_output_params(rfile->output, &params);
1da177e4 LT	38	case SNDRV_RAWMIDI_STREAM_INPUT:
8a56ef4f TI	39	if (!rfile->input)
8a56ef4f TI	40	return -EINVAL;
1da177e4 LT	41	return snd_rawmidi_input_params(rfile->input, &params);
	42	}
	43	return -EINVAL;
	44	}
	45
d9e5582c	46	struct compat_snd_rawmidi_status64 {
1da177e4	47	s32 stream;
d9e5582c BW	48	u8 rsvd[4]; /* alignment */
	49	s64 tstamp_sec;
	50	s64 tstamp_nsec;
1da177e4 LT	51	u32 avail;
	52	u32 xruns;
	53	unsigned char reserved[16];
	54	} __attribute__((packed));
	55
d9e5582c BW	56	static int snd_rawmidi_ioctl_status_compat64(struct snd_rawmidi_file *rfile,
d9e5582c BW	57	struct compat_snd_rawmidi_status64 __user *src)
1da177e4 LT	58	{
1da177e4 LT	59	int err;
d9e5582c BW	60	struct snd_rawmidi_status64 status;
d9e5582c BW	61	struct compat_snd_rawmidi_status64 compat_status;
1da177e4	62
1da177e4 LT	63	if (get_user(status.stream, &src->stream))
	64	return -EFAULT;
	65
	66	switch (status.stream) {
	67	case SNDRV_RAWMIDI_STREAM_OUTPUT:
8a56ef4f TI	68	if (!rfile->output)
8a56ef4f TI	69	return -EINVAL;
1da177e4 LT	70	err = snd_rawmidi_output_status(rfile->output, &status);
	71	break;
	72	case SNDRV_RAWMIDI_STREAM_INPUT:
8a56ef4f TI	73	if (!rfile->input)
8a56ef4f TI	74	return -EINVAL;
1da177e4 LT	75	err = snd_rawmidi_input_status(rfile->input, &status);
	76	break;
	77	default:
	78	return -EINVAL;
	79	}
	80	if (err < 0)
	81	return err;
	82
d9e5582c BW	83	compat_status = (struct compat_snd_rawmidi_status64) {
	84	.stream = status.stream,
	85	.tstamp_sec = status.tstamp_sec,
	86	.tstamp_nsec = status.tstamp_nsec,
	87	.avail = status.avail,
	88	.xruns = status.xruns,
	89	};
2251fbbc	90
d9e5582c	91	if (copy_to_user(src, &compat_status, sizeof(*src)))
2251fbbc TI	92	return -EFAULT;
	93
	94	return 0;
	95	}
2251fbbc	96
1da177e4	97	enum {
48c9d417	98	SNDRV_RAWMIDI_IOCTL_PARAMS32 = _IOWR('W', 0x10, struct snd_rawmidi_params32),
d9e5582c BW	99	SNDRV_RAWMIDI_IOCTL_STATUS_COMPAT32 = _IOWR('W', 0x20, struct snd_rawmidi_status32),
d9e5582c BW	100	SNDRV_RAWMIDI_IOCTL_STATUS_COMPAT64 = _IOWR('W', 0x20, struct compat_snd_rawmidi_status64),
1da177e4 LT	101	};
	102
	103	static long snd_rawmidi_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
	104	{
48c9d417	105	struct snd_rawmidi_file *rfile;
1da177e4 LT	106	void __user *argp = compat_ptr(arg);
	107
	108	rfile = file->private_data;
	109	switch (cmd) {
	110	case SNDRV_RAWMIDI_IOCTL_PVERSION:
	111	case SNDRV_RAWMIDI_IOCTL_INFO:
	112	case SNDRV_RAWMIDI_IOCTL_DROP:
	113	case SNDRV_RAWMIDI_IOCTL_DRAIN:
	114	return snd_rawmidi_ioctl(file, cmd, (unsigned long)argp);
	115	case SNDRV_RAWMIDI_IOCTL_PARAMS32:
	116	return snd_rawmidi_ioctl_params_compat(rfile, argp);
d9e5582c BW	117	case SNDRV_RAWMIDI_IOCTL_STATUS_COMPAT32:
	118	return snd_rawmidi_ioctl_status32(rfile, argp);
	119	case SNDRV_RAWMIDI_IOCTL_STATUS_COMPAT64:
	120	return snd_rawmidi_ioctl_status_compat64(rfile, argp);
1da177e4 LT	121	}
	122	return -ENOIOCTLCMD;
	123	}