1/* 2 comedi/comedi_compat32.c 3 32-bit ioctl compatibility for 64-bit comedi kernel module. 4 5 Author: Ian Abbott, MEV Ltd. <abbotti@mev.co.uk> 6 Copyright (C) 2007 MEV Ltd. <http://www.mev.co.uk/> 7 8 COMEDI - Linux Control and Measurement Device Interface 9 Copyright (C) 1997-2007 David A. Schleef <ds@schleef.org> 10 11 This program is free software; you can redistribute it and/or modify 12 it under the terms of the GNU General Public License as published by 13 the Free Software Foundation; either version 2 of the License, or 14 (at your option) any later version. 15 16 This program is distributed in the hope that it will be useful, 17 but WITHOUT ANY WARRANTY; without even the implied warranty of 18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19 GNU General Public License for more details. 20*/ 21 22#include <linux/uaccess.h> 23#include <linux/compat.h> 24#include <linux/fs.h> 25#include "comedi.h" 26#include "comedi_compat32.h" 27 28#define COMEDI32_CHANINFO _IOR(CIO, 3, struct comedi32_chaninfo_struct) 29#define COMEDI32_RANGEINFO _IOR(CIO, 8, struct comedi32_rangeinfo_struct) 30/* N.B. COMEDI32_CMD and COMEDI_CMD ought to use _IOWR, not _IOR. 31 * It's too late to change it now, but it only affects the command number. */ 32#define COMEDI32_CMD _IOR(CIO, 9, struct comedi32_cmd_struct) 33/* N.B. COMEDI32_CMDTEST and COMEDI_CMDTEST ought to use _IOWR, not _IOR. 34 * It's too late to change it now, but it only affects the command number. */ 35#define COMEDI32_CMDTEST _IOR(CIO, 10, struct comedi32_cmd_struct) 36#define COMEDI32_INSNLIST _IOR(CIO, 11, struct comedi32_insnlist_struct) 37#define COMEDI32_INSN _IOR(CIO, 12, struct comedi32_insn_struct) 38 39struct comedi32_chaninfo_struct { 40 unsigned int subdev; 41 compat_uptr_t maxdata_list; /* 32-bit 'unsigned int *' */ 42 compat_uptr_t flaglist; /* 32-bit 'unsigned int *' */ 43 compat_uptr_t rangelist; /* 32-bit 'unsigned int *' */ 44 unsigned int unused[4]; 45}; 46 47struct comedi32_rangeinfo_struct { 48 unsigned int range_type; 49 compat_uptr_t range_ptr; /* 32-bit 'void *' */ 50}; 51 52struct comedi32_cmd_struct { 53 unsigned int subdev; 54 unsigned int flags; 55 unsigned int start_src; 56 unsigned int start_arg; 57 unsigned int scan_begin_src; 58 unsigned int scan_begin_arg; 59 unsigned int convert_src; 60 unsigned int convert_arg; 61 unsigned int scan_end_src; 62 unsigned int scan_end_arg; 63 unsigned int stop_src; 64 unsigned int stop_arg; 65 compat_uptr_t chanlist; /* 32-bit 'unsigned int *' */ 66 unsigned int chanlist_len; 67 compat_uptr_t data; /* 32-bit 'short *' */ 68 unsigned int data_len; 69}; 70 71struct comedi32_insn_struct { 72 unsigned int insn; 73 unsigned int n; 74 compat_uptr_t data; /* 32-bit 'unsigned int *' */ 75 unsigned int subdev; 76 unsigned int chanspec; 77 unsigned int unused[3]; 78}; 79 80struct comedi32_insnlist_struct { 81 unsigned int n_insns; 82 compat_uptr_t insns; /* 32-bit 'struct comedi_insn *' */ 83}; 84 85/* Handle translated ioctl. */ 86static int translated_ioctl(struct file *file, unsigned int cmd, 87 unsigned long arg) 88{ 89 if (file->f_op->unlocked_ioctl) 90 return file->f_op->unlocked_ioctl(file, cmd, arg); 91 92 return -ENOTTY; 93} 94 95/* Handle 32-bit COMEDI_CHANINFO ioctl. */ 96static int compat_chaninfo(struct file *file, unsigned long arg) 97{ 98 struct comedi_chaninfo __user *chaninfo; 99 struct comedi32_chaninfo_struct __user *chaninfo32; 100 int err; 101 union { 102 unsigned int uint; 103 compat_uptr_t uptr; 104 } temp; 105 106 chaninfo32 = compat_ptr(arg); 107 chaninfo = compat_alloc_user_space(sizeof(*chaninfo)); 108 109 /* Copy chaninfo structure. Ignore unused members. */ 110 if (!access_ok(VERIFY_READ, chaninfo32, sizeof(*chaninfo32)) || 111 !access_ok(VERIFY_WRITE, chaninfo, sizeof(*chaninfo))) 112 return -EFAULT; 113 114 err = 0; 115 err |= __get_user(temp.uint, &chaninfo32->subdev); 116 err |= __put_user(temp.uint, &chaninfo->subdev); 117 err |= __get_user(temp.uptr, &chaninfo32->maxdata_list); 118 err |= __put_user(compat_ptr(temp.uptr), &chaninfo->maxdata_list); 119 err |= __get_user(temp.uptr, &chaninfo32->flaglist); 120 err |= __put_user(compat_ptr(temp.uptr), &chaninfo->flaglist); 121 err |= __get_user(temp.uptr, &chaninfo32->rangelist); 122 err |= __put_user(compat_ptr(temp.uptr), &chaninfo->rangelist); 123 if (err) 124 return -EFAULT; 125 126 return translated_ioctl(file, COMEDI_CHANINFO, (unsigned long)chaninfo); 127} 128 129/* Handle 32-bit COMEDI_RANGEINFO ioctl. */ 130static int compat_rangeinfo(struct file *file, unsigned long arg) 131{ 132 struct comedi_rangeinfo __user *rangeinfo; 133 struct comedi32_rangeinfo_struct __user *rangeinfo32; 134 int err; 135 union { 136 unsigned int uint; 137 compat_uptr_t uptr; 138 } temp; 139 140 rangeinfo32 = compat_ptr(arg); 141 rangeinfo = compat_alloc_user_space(sizeof(*rangeinfo)); 142 143 /* Copy rangeinfo structure. */ 144 if (!access_ok(VERIFY_READ, rangeinfo32, sizeof(*rangeinfo32)) || 145 !access_ok(VERIFY_WRITE, rangeinfo, sizeof(*rangeinfo))) 146 return -EFAULT; 147 148 err = 0; 149 err |= __get_user(temp.uint, &rangeinfo32->range_type); 150 err |= __put_user(temp.uint, &rangeinfo->range_type); 151 err |= __get_user(temp.uptr, &rangeinfo32->range_ptr); 152 err |= __put_user(compat_ptr(temp.uptr), &rangeinfo->range_ptr); 153 if (err) 154 return -EFAULT; 155 156 return translated_ioctl(file, COMEDI_RANGEINFO, 157 (unsigned long)rangeinfo); 158} 159 160/* Copy 32-bit cmd structure to native cmd structure. */ 161static int get_compat_cmd(struct comedi_cmd __user *cmd, 162 struct comedi32_cmd_struct __user *cmd32) 163{ 164 int err; 165 union { 166 unsigned int uint; 167 compat_uptr_t uptr; 168 } temp; 169 170 /* Copy cmd structure. */ 171 if (!access_ok(VERIFY_READ, cmd32, sizeof(*cmd32)) || 172 !access_ok(VERIFY_WRITE, cmd, sizeof(*cmd))) 173 return -EFAULT; 174 175 err = 0; 176 err |= __get_user(temp.uint, &cmd32->subdev); 177 err |= __put_user(temp.uint, &cmd->subdev); 178 err |= __get_user(temp.uint, &cmd32->flags); 179 err |= __put_user(temp.uint, &cmd->flags); 180 err |= __get_user(temp.uint, &cmd32->start_src); 181 err |= __put_user(temp.uint, &cmd->start_src); 182 err |= __get_user(temp.uint, &cmd32->start_arg); 183 err |= __put_user(temp.uint, &cmd->start_arg); 184 err |= __get_user(temp.uint, &cmd32->scan_begin_src); 185 err |= __put_user(temp.uint, &cmd->scan_begin_src); 186 err |= __get_user(temp.uint, &cmd32->scan_begin_arg); 187 err |= __put_user(temp.uint, &cmd->scan_begin_arg); 188 err |= __get_user(temp.uint, &cmd32->convert_src); 189 err |= __put_user(temp.uint, &cmd->convert_src); 190 err |= __get_user(temp.uint, &cmd32->convert_arg); 191 err |= __put_user(temp.uint, &cmd->convert_arg); 192 err |= __get_user(temp.uint, &cmd32->scan_end_src); 193 err |= __put_user(temp.uint, &cmd->scan_end_src); 194 err |= __get_user(temp.uint, &cmd32->scan_end_arg); 195 err |= __put_user(temp.uint, &cmd->scan_end_arg); 196 err |= __get_user(temp.uint, &cmd32->stop_src); 197 err |= __put_user(temp.uint, &cmd->stop_src); 198 err |= __get_user(temp.uint, &cmd32->stop_arg); 199 err |= __put_user(temp.uint, &cmd->stop_arg); 200 err |= __get_user(temp.uptr, &cmd32->chanlist); 201 err |= __put_user(compat_ptr(temp.uptr), &cmd->chanlist); 202 err |= __get_user(temp.uint, &cmd32->chanlist_len); 203 err |= __put_user(temp.uint, &cmd->chanlist_len); 204 err |= __get_user(temp.uptr, &cmd32->data); 205 err |= __put_user(compat_ptr(temp.uptr), &cmd->data); 206 err |= __get_user(temp.uint, &cmd32->data_len); 207 err |= __put_user(temp.uint, &cmd->data_len); 208 return err ? -EFAULT : 0; 209} 210 211/* Copy native cmd structure to 32-bit cmd structure. */ 212static int put_compat_cmd(struct comedi32_cmd_struct __user *cmd32, 213 struct comedi_cmd __user *cmd) 214{ 215 int err; 216 unsigned int temp; 217 218 /* Copy back most of cmd structure. */ 219 /* Assume the pointer values are already valid. */ 220 /* (Could use ptr_to_compat() to set them, but that wasn't implemented 221 * until kernel version 2.6.11.) */ 222 if (!access_ok(VERIFY_READ, cmd, sizeof(*cmd)) || 223 !access_ok(VERIFY_WRITE, cmd32, sizeof(*cmd32))) 224 return -EFAULT; 225 226 err = 0; 227 err |= __get_user(temp, &cmd->subdev); 228 err |= __put_user(temp, &cmd32->subdev); 229 err |= __get_user(temp, &cmd->flags); 230 err |= __put_user(temp, &cmd32->flags); 231 err |= __get_user(temp, &cmd->start_src); 232 err |= __put_user(temp, &cmd32->start_src); 233 err |= __get_user(temp, &cmd->start_arg); 234 err |= __put_user(temp, &cmd32->start_arg); 235 err |= __get_user(temp, &cmd->scan_begin_src); 236 err |= __put_user(temp, &cmd32->scan_begin_src); 237 err |= __get_user(temp, &cmd->scan_begin_arg); 238 err |= __put_user(temp, &cmd32->scan_begin_arg); 239 err |= __get_user(temp, &cmd->convert_src); 240 err |= __put_user(temp, &cmd32->convert_src); 241 err |= __get_user(temp, &cmd->convert_arg); 242 err |= __put_user(temp, &cmd32->convert_arg); 243 err |= __get_user(temp, &cmd->scan_end_src); 244 err |= __put_user(temp, &cmd32->scan_end_src); 245 err |= __get_user(temp, &cmd->scan_end_arg); 246 err |= __put_user(temp, &cmd32->scan_end_arg); 247 err |= __get_user(temp, &cmd->stop_src); 248 err |= __put_user(temp, &cmd32->stop_src); 249 err |= __get_user(temp, &cmd->stop_arg); 250 err |= __put_user(temp, &cmd32->stop_arg); 251 /* Assume chanlist pointer is unchanged. */ 252 err |= __get_user(temp, &cmd->chanlist_len); 253 err |= __put_user(temp, &cmd32->chanlist_len); 254 /* Assume data pointer is unchanged. */ 255 err |= __get_user(temp, &cmd->data_len); 256 err |= __put_user(temp, &cmd32->data_len); 257 return err ? -EFAULT : 0; 258} 259 260/* Handle 32-bit COMEDI_CMD ioctl. */ 261static int compat_cmd(struct file *file, unsigned long arg) 262{ 263 struct comedi_cmd __user *cmd; 264 struct comedi32_cmd_struct __user *cmd32; 265 int rc; 266 267 cmd32 = compat_ptr(arg); 268 cmd = compat_alloc_user_space(sizeof(*cmd)); 269 270 rc = get_compat_cmd(cmd, cmd32); 271 if (rc) 272 return rc; 273 274 return translated_ioctl(file, COMEDI_CMD, (unsigned long)cmd); 275} 276 277/* Handle 32-bit COMEDI_CMDTEST ioctl. */ 278static int compat_cmdtest(struct file *file, unsigned long arg) 279{ 280 struct comedi_cmd __user *cmd; 281 struct comedi32_cmd_struct __user *cmd32; 282 int rc, err; 283 284 cmd32 = compat_ptr(arg); 285 cmd = compat_alloc_user_space(sizeof(*cmd)); 286 287 rc = get_compat_cmd(cmd, cmd32); 288 if (rc) 289 return rc; 290 291 rc = translated_ioctl(file, COMEDI_CMDTEST, (unsigned long)cmd); 292 if (rc < 0) 293 return rc; 294 295 err = put_compat_cmd(cmd32, cmd); 296 if (err) 297 rc = err; 298 299 return rc; 300} 301 302/* Copy 32-bit insn structure to native insn structure. */ 303static int get_compat_insn(struct comedi_insn __user *insn, 304 struct comedi32_insn_struct __user *insn32) 305{ 306 int err; 307 union { 308 unsigned int uint; 309 compat_uptr_t uptr; 310 } temp; 311 312 /* Copy insn structure. Ignore the unused members. */ 313 err = 0; 314 if (!access_ok(VERIFY_READ, insn32, sizeof(*insn32)) || 315 !access_ok(VERIFY_WRITE, insn, sizeof(*insn))) 316 return -EFAULT; 317 318 err |= __get_user(temp.uint, &insn32->insn); 319 err |= __put_user(temp.uint, &insn->insn); 320 err |= __get_user(temp.uint, &insn32->n); 321 err |= __put_user(temp.uint, &insn->n); 322 err |= __get_user(temp.uptr, &insn32->data); 323 err |= __put_user(compat_ptr(temp.uptr), &insn->data); 324 err |= __get_user(temp.uint, &insn32->subdev); 325 err |= __put_user(temp.uint, &insn->subdev); 326 err |= __get_user(temp.uint, &insn32->chanspec); 327 err |= __put_user(temp.uint, &insn->chanspec); 328 return err ? -EFAULT : 0; 329} 330 331/* Handle 32-bit COMEDI_INSNLIST ioctl. */ 332static int compat_insnlist(struct file *file, unsigned long arg) 333{ 334 struct combined_insnlist { 335 struct comedi_insnlist insnlist; 336 struct comedi_insn insn[1]; 337 } __user *s; 338 struct comedi32_insnlist_struct __user *insnlist32; 339 struct comedi32_insn_struct __user *insn32; 340 compat_uptr_t uptr; 341 unsigned int n_insns, n; 342 int err, rc; 343 344 insnlist32 = compat_ptr(arg); 345 346 /* Get 32-bit insnlist structure. */ 347 if (!access_ok(VERIFY_READ, insnlist32, sizeof(*insnlist32))) 348 return -EFAULT; 349 350 err = 0; 351 err |= __get_user(n_insns, &insnlist32->n_insns); 352 err |= __get_user(uptr, &insnlist32->insns); 353 insn32 = compat_ptr(uptr); 354 if (err) 355 return -EFAULT; 356 357 /* Allocate user memory to copy insnlist and insns into. */ 358 s = compat_alloc_user_space(offsetof(struct combined_insnlist, 359 insn[n_insns])); 360 361 /* Set native insnlist structure. */ 362 if (!access_ok(VERIFY_WRITE, &s->insnlist, sizeof(s->insnlist))) 363 return -EFAULT; 364 365 err |= __put_user(n_insns, &s->insnlist.n_insns); 366 err |= __put_user(&s->insn[0], &s->insnlist.insns); 367 if (err) 368 return -EFAULT; 369 370 /* Copy insn structures. */ 371 for (n = 0; n < n_insns; n++) { 372 rc = get_compat_insn(&s->insn[n], &insn32[n]); 373 if (rc) 374 return rc; 375 } 376 377 return translated_ioctl(file, COMEDI_INSNLIST, 378 (unsigned long)&s->insnlist); 379} 380 381/* Handle 32-bit COMEDI_INSN ioctl. */ 382static int compat_insn(struct file *file, unsigned long arg) 383{ 384 struct comedi_insn __user *insn; 385 struct comedi32_insn_struct __user *insn32; 386 int rc; 387 388 insn32 = compat_ptr(arg); 389 insn = compat_alloc_user_space(sizeof(*insn)); 390 391 rc = get_compat_insn(insn, insn32); 392 if (rc) 393 return rc; 394 395 return translated_ioctl(file, COMEDI_INSN, (unsigned long)insn); 396} 397 398/* Process untranslated ioctl. */ 399/* Returns -ENOIOCTLCMD for unrecognised ioctl codes. */ 400static inline int raw_ioctl(struct file *file, unsigned int cmd, 401 unsigned long arg) 402{ 403 int rc; 404 405 switch (cmd) { 406 case COMEDI_DEVCONFIG: 407 case COMEDI_DEVINFO: 408 case COMEDI_SUBDINFO: 409 case COMEDI_BUFCONFIG: 410 case COMEDI_BUFINFO: 411 /* Just need to translate the pointer argument. */ 412 arg = (unsigned long)compat_ptr(arg); 413 rc = translated_ioctl(file, cmd, arg); 414 break; 415 case COMEDI_LOCK: 416 case COMEDI_UNLOCK: 417 case COMEDI_CANCEL: 418 case COMEDI_POLL: 419 /* No translation needed. */ 420 rc = translated_ioctl(file, cmd, arg); 421 break; 422 case COMEDI32_CHANINFO: 423 rc = compat_chaninfo(file, arg); 424 break; 425 case COMEDI32_RANGEINFO: 426 rc = compat_rangeinfo(file, arg); 427 break; 428 case COMEDI32_CMD: 429 rc = compat_cmd(file, arg); 430 break; 431 case COMEDI32_CMDTEST: 432 rc = compat_cmdtest(file, arg); 433 break; 434 case COMEDI32_INSNLIST: 435 rc = compat_insnlist(file, arg); 436 break; 437 case COMEDI32_INSN: 438 rc = compat_insn(file, arg); 439 break; 440 default: 441 rc = -ENOIOCTLCMD; 442 break; 443 } 444 return rc; 445} 446 447/* compat_ioctl file operation. */ 448/* Returns -ENOIOCTLCMD for unrecognised ioctl codes. */ 449long comedi_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 450{ 451 return raw_ioctl(file, cmd, arg); 452} 453