diff options
Diffstat (limited to 'sound/core/rawmidi_compat.c')
| -rw-r--r-- | sound/core/rawmidi_compat.c | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/sound/core/rawmidi_compat.c b/sound/core/rawmidi_compat.c new file mode 100644 index 000000000..68a934435 --- /dev/null +++ b/sound/core/rawmidi_compat.c @@ -0,0 +1,123 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * 32bit -> 64bit ioctl wrapper for raw MIDI API + * Copyright (c) by Takashi Iwai <tiwai@suse.de> + */ + +/* 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, ¶ms); + case SNDRV_RAWMIDI_STREAM_INPUT: + if (!rfile->input) + return -EINVAL; + return snd_rawmidi_input_params(rfile->input, ¶ms); + } + 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; +} |