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, ¶ms); 50 case SNDRV_RAWMIDI_STREAM_INPUT: 51 if (!rfile->input) 52 return -EINVAL; 53 return snd_rawmidi_input_params(rfile->input, ¶ms); 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 } 179