2 * comedi/comedi_compat32.c
3 * 32-bit ioctl compatibility for 64-bit comedi kernel module.
5 * Author: Ian Abbott, MEV Ltd. <abbotti@mev.co.uk>
6 * Copyright (C) 2007 MEV Ltd. <http://www.mev.co.uk/>
8 * COMEDI - Linux Control and Measurement Device Interface
9 * Copyright (C) 1997-2007 David A. Schleef <ds@schleef.org>
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.
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.
22 #include <linux/uaccess.h>
23 #include <linux/compat.h>
26 #include "comedi_compat32.h"
28 #define COMEDI32_CHANINFO _IOR(CIO, 3, struct comedi32_chaninfo_struct)
29 #define COMEDI32_RANGEINFO _IOR(CIO, 8, struct comedi32_rangeinfo_struct)
31 * N.B. COMEDI32_CMD and COMEDI_CMD ought to use _IOWR, not _IOR.
32 * It's too late to change it now, but it only affects the command number.
34 #define COMEDI32_CMD _IOR(CIO, 9, struct comedi32_cmd_struct)
36 * N.B. COMEDI32_CMDTEST and COMEDI_CMDTEST ought to use _IOWR, not _IOR.
37 * It's too late to change it now, but it only affects the command number.
39 #define COMEDI32_CMDTEST _IOR(CIO, 10, struct comedi32_cmd_struct)
40 #define COMEDI32_INSNLIST _IOR(CIO, 11, struct comedi32_insnlist_struct)
41 #define COMEDI32_INSN _IOR(CIO, 12, struct comedi32_insn_struct)
43 struct comedi32_chaninfo_struct {
45 compat_uptr_t maxdata_list; /* 32-bit 'unsigned int *' */
46 compat_uptr_t flaglist; /* 32-bit 'unsigned int *' */
47 compat_uptr_t rangelist; /* 32-bit 'unsigned int *' */
48 unsigned int unused[4];
51 struct comedi32_rangeinfo_struct {
52 unsigned int range_type;
53 compat_uptr_t range_ptr; /* 32-bit 'void *' */
56 struct comedi32_cmd_struct {
59 unsigned int start_src;
60 unsigned int start_arg;
61 unsigned int scan_begin_src;
62 unsigned int scan_begin_arg;
63 unsigned int convert_src;
64 unsigned int convert_arg;
65 unsigned int scan_end_src;
66 unsigned int scan_end_arg;
67 unsigned int stop_src;
68 unsigned int stop_arg;
69 compat_uptr_t chanlist; /* 32-bit 'unsigned int *' */
70 unsigned int chanlist_len;
71 compat_uptr_t data; /* 32-bit 'short *' */
72 unsigned int data_len;
75 struct comedi32_insn_struct {
78 compat_uptr_t data; /* 32-bit 'unsigned int *' */
80 unsigned int chanspec;
81 unsigned int unused[3];
84 struct comedi32_insnlist_struct {
86 compat_uptr_t insns; /* 32-bit 'struct comedi_insn *' */
89 /* Handle translated ioctl. */
90 static int translated_ioctl(struct file *file, unsigned int cmd,
93 if (file->f_op->unlocked_ioctl)
94 return file->f_op->unlocked_ioctl(file, cmd, arg);
99 /* Handle 32-bit COMEDI_CHANINFO ioctl. */
100 static int compat_chaninfo(struct file *file, unsigned long arg)
102 struct comedi_chaninfo __user *chaninfo;
103 struct comedi32_chaninfo_struct __user *chaninfo32;
110 chaninfo32 = compat_ptr(arg);
111 chaninfo = compat_alloc_user_space(sizeof(*chaninfo));
113 /* Copy chaninfo structure. Ignore unused members. */
114 if (!access_ok(VERIFY_READ, chaninfo32, sizeof(*chaninfo32)) ||
115 !access_ok(VERIFY_WRITE, chaninfo, sizeof(*chaninfo)))
119 err |= __get_user(temp.uint, &chaninfo32->subdev);
120 err |= __put_user(temp.uint, &chaninfo->subdev);
121 err |= __get_user(temp.uptr, &chaninfo32->maxdata_list);
122 err |= __put_user(compat_ptr(temp.uptr), &chaninfo->maxdata_list);
123 err |= __get_user(temp.uptr, &chaninfo32->flaglist);
124 err |= __put_user(compat_ptr(temp.uptr), &chaninfo->flaglist);
125 err |= __get_user(temp.uptr, &chaninfo32->rangelist);
126 err |= __put_user(compat_ptr(temp.uptr), &chaninfo->rangelist);
130 return translated_ioctl(file, COMEDI_CHANINFO, (unsigned long)chaninfo);
133 /* Handle 32-bit COMEDI_RANGEINFO ioctl. */
134 static int compat_rangeinfo(struct file *file, unsigned long arg)
136 struct comedi_rangeinfo __user *rangeinfo;
137 struct comedi32_rangeinfo_struct __user *rangeinfo32;
144 rangeinfo32 = compat_ptr(arg);
145 rangeinfo = compat_alloc_user_space(sizeof(*rangeinfo));
147 /* Copy rangeinfo structure. */
148 if (!access_ok(VERIFY_READ, rangeinfo32, sizeof(*rangeinfo32)) ||
149 !access_ok(VERIFY_WRITE, rangeinfo, sizeof(*rangeinfo)))
153 err |= __get_user(temp.uint, &rangeinfo32->range_type);
154 err |= __put_user(temp.uint, &rangeinfo->range_type);
155 err |= __get_user(temp.uptr, &rangeinfo32->range_ptr);
156 err |= __put_user(compat_ptr(temp.uptr), &rangeinfo->range_ptr);
160 return translated_ioctl(file, COMEDI_RANGEINFO,
161 (unsigned long)rangeinfo);
164 /* Copy 32-bit cmd structure to native cmd structure. */
165 static int get_compat_cmd(struct comedi_cmd __user *cmd,
166 struct comedi32_cmd_struct __user *cmd32)
174 /* Copy cmd structure. */
175 if (!access_ok(VERIFY_READ, cmd32, sizeof(*cmd32)) ||
176 !access_ok(VERIFY_WRITE, cmd, sizeof(*cmd)))
180 err |= __get_user(temp.uint, &cmd32->subdev);
181 err |= __put_user(temp.uint, &cmd->subdev);
182 err |= __get_user(temp.uint, &cmd32->flags);
183 err |= __put_user(temp.uint, &cmd->flags);
184 err |= __get_user(temp.uint, &cmd32->start_src);
185 err |= __put_user(temp.uint, &cmd->start_src);
186 err |= __get_user(temp.uint, &cmd32->start_arg);
187 err |= __put_user(temp.uint, &cmd->start_arg);
188 err |= __get_user(temp.uint, &cmd32->scan_begin_src);
189 err |= __put_user(temp.uint, &cmd->scan_begin_src);
190 err |= __get_user(temp.uint, &cmd32->scan_begin_arg);
191 err |= __put_user(temp.uint, &cmd->scan_begin_arg);
192 err |= __get_user(temp.uint, &cmd32->convert_src);
193 err |= __put_user(temp.uint, &cmd->convert_src);
194 err |= __get_user(temp.uint, &cmd32->convert_arg);
195 err |= __put_user(temp.uint, &cmd->convert_arg);
196 err |= __get_user(temp.uint, &cmd32->scan_end_src);
197 err |= __put_user(temp.uint, &cmd->scan_end_src);
198 err |= __get_user(temp.uint, &cmd32->scan_end_arg);
199 err |= __put_user(temp.uint, &cmd->scan_end_arg);
200 err |= __get_user(temp.uint, &cmd32->stop_src);
201 err |= __put_user(temp.uint, &cmd->stop_src);
202 err |= __get_user(temp.uint, &cmd32->stop_arg);
203 err |= __put_user(temp.uint, &cmd->stop_arg);
204 err |= __get_user(temp.uptr, &cmd32->chanlist);
205 err |= __put_user((unsigned int __force *)compat_ptr(temp.uptr),
207 err |= __get_user(temp.uint, &cmd32->chanlist_len);
208 err |= __put_user(temp.uint, &cmd->chanlist_len);
209 err |= __get_user(temp.uptr, &cmd32->data);
210 err |= __put_user(compat_ptr(temp.uptr), &cmd->data);
211 err |= __get_user(temp.uint, &cmd32->data_len);
212 err |= __put_user(temp.uint, &cmd->data_len);
213 return err ? -EFAULT : 0;
216 /* Copy native cmd structure to 32-bit cmd structure. */
217 static int put_compat_cmd(struct comedi32_cmd_struct __user *cmd32,
218 struct comedi_cmd __user *cmd)
224 * Copy back most of cmd structure.
226 * Assume the pointer values are already valid.
227 * (Could use ptr_to_compat() to set them.)
229 if (!access_ok(VERIFY_READ, cmd, sizeof(*cmd)) ||
230 !access_ok(VERIFY_WRITE, cmd32, sizeof(*cmd32)))
234 err |= __get_user(temp, &cmd->subdev);
235 err |= __put_user(temp, &cmd32->subdev);
236 err |= __get_user(temp, &cmd->flags);
237 err |= __put_user(temp, &cmd32->flags);
238 err |= __get_user(temp, &cmd->start_src);
239 err |= __put_user(temp, &cmd32->start_src);
240 err |= __get_user(temp, &cmd->start_arg);
241 err |= __put_user(temp, &cmd32->start_arg);
242 err |= __get_user(temp, &cmd->scan_begin_src);
243 err |= __put_user(temp, &cmd32->scan_begin_src);
244 err |= __get_user(temp, &cmd->scan_begin_arg);
245 err |= __put_user(temp, &cmd32->scan_begin_arg);
246 err |= __get_user(temp, &cmd->convert_src);
247 err |= __put_user(temp, &cmd32->convert_src);
248 err |= __get_user(temp, &cmd->convert_arg);
249 err |= __put_user(temp, &cmd32->convert_arg);
250 err |= __get_user(temp, &cmd->scan_end_src);
251 err |= __put_user(temp, &cmd32->scan_end_src);
252 err |= __get_user(temp, &cmd->scan_end_arg);
253 err |= __put_user(temp, &cmd32->scan_end_arg);
254 err |= __get_user(temp, &cmd->stop_src);
255 err |= __put_user(temp, &cmd32->stop_src);
256 err |= __get_user(temp, &cmd->stop_arg);
257 err |= __put_user(temp, &cmd32->stop_arg);
258 /* Assume chanlist pointer is unchanged. */
259 err |= __get_user(temp, &cmd->chanlist_len);
260 err |= __put_user(temp, &cmd32->chanlist_len);
261 /* Assume data pointer is unchanged. */
262 err |= __get_user(temp, &cmd->data_len);
263 err |= __put_user(temp, &cmd32->data_len);
264 return err ? -EFAULT : 0;
267 /* Handle 32-bit COMEDI_CMD ioctl. */
268 static int compat_cmd(struct file *file, unsigned long arg)
270 struct comedi_cmd __user *cmd;
271 struct comedi32_cmd_struct __user *cmd32;
274 cmd32 = compat_ptr(arg);
275 cmd = compat_alloc_user_space(sizeof(*cmd));
277 rc = get_compat_cmd(cmd, cmd32);
281 rc = translated_ioctl(file, COMEDI_CMD, (unsigned long)cmd);
283 /* Special case: copy cmd back to user. */
284 err = put_compat_cmd(cmd32, cmd);
292 /* Handle 32-bit COMEDI_CMDTEST ioctl. */
293 static int compat_cmdtest(struct file *file, unsigned long arg)
295 struct comedi_cmd __user *cmd;
296 struct comedi32_cmd_struct __user *cmd32;
299 cmd32 = compat_ptr(arg);
300 cmd = compat_alloc_user_space(sizeof(*cmd));
302 rc = get_compat_cmd(cmd, cmd32);
306 rc = translated_ioctl(file, COMEDI_CMDTEST, (unsigned long)cmd);
310 err = put_compat_cmd(cmd32, cmd);
317 /* Copy 32-bit insn structure to native insn structure. */
318 static int get_compat_insn(struct comedi_insn __user *insn,
319 struct comedi32_insn_struct __user *insn32)
327 /* Copy insn structure. Ignore the unused members. */
329 if (!access_ok(VERIFY_READ, insn32, sizeof(*insn32)) ||
330 !access_ok(VERIFY_WRITE, insn, sizeof(*insn)))
333 err |= __get_user(temp.uint, &insn32->insn);
334 err |= __put_user(temp.uint, &insn->insn);
335 err |= __get_user(temp.uint, &insn32->n);
336 err |= __put_user(temp.uint, &insn->n);
337 err |= __get_user(temp.uptr, &insn32->data);
338 err |= __put_user(compat_ptr(temp.uptr), &insn->data);
339 err |= __get_user(temp.uint, &insn32->subdev);
340 err |= __put_user(temp.uint, &insn->subdev);
341 err |= __get_user(temp.uint, &insn32->chanspec);
342 err |= __put_user(temp.uint, &insn->chanspec);
343 return err ? -EFAULT : 0;
346 /* Handle 32-bit COMEDI_INSNLIST ioctl. */
347 static int compat_insnlist(struct file *file, unsigned long arg)
349 struct combined_insnlist {
350 struct comedi_insnlist insnlist;
351 struct comedi_insn insn[1];
353 struct comedi32_insnlist_struct __user *insnlist32;
354 struct comedi32_insn_struct __user *insn32;
356 unsigned int n_insns, n;
359 insnlist32 = compat_ptr(arg);
361 /* Get 32-bit insnlist structure. */
362 if (!access_ok(VERIFY_READ, insnlist32, sizeof(*insnlist32)))
366 err |= __get_user(n_insns, &insnlist32->n_insns);
367 err |= __get_user(uptr, &insnlist32->insns);
368 insn32 = compat_ptr(uptr);
372 /* Allocate user memory to copy insnlist and insns into. */
373 s = compat_alloc_user_space(offsetof(struct combined_insnlist,
376 /* Set native insnlist structure. */
377 if (!access_ok(VERIFY_WRITE, &s->insnlist, sizeof(s->insnlist)))
380 err |= __put_user(n_insns, &s->insnlist.n_insns);
381 err |= __put_user(&s->insn[0], &s->insnlist.insns);
385 /* Copy insn structures. */
386 for (n = 0; n < n_insns; n++) {
387 rc = get_compat_insn(&s->insn[n], &insn32[n]);
392 return translated_ioctl(file, COMEDI_INSNLIST,
393 (unsigned long)&s->insnlist);
396 /* Handle 32-bit COMEDI_INSN ioctl. */
397 static int compat_insn(struct file *file, unsigned long arg)
399 struct comedi_insn __user *insn;
400 struct comedi32_insn_struct __user *insn32;
403 insn32 = compat_ptr(arg);
404 insn = compat_alloc_user_space(sizeof(*insn));
406 rc = get_compat_insn(insn, insn32);
410 return translated_ioctl(file, COMEDI_INSN, (unsigned long)insn);
414 * compat_ioctl file operation.
416 * Returns -ENOIOCTLCMD for unrecognised ioctl codes.
418 long comedi_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
423 case COMEDI_DEVCONFIG:
425 case COMEDI_SUBDINFO:
426 case COMEDI_BUFCONFIG:
428 /* Just need to translate the pointer argument. */
429 arg = (unsigned long)compat_ptr(arg);
430 rc = translated_ioctl(file, cmd, arg);
436 case COMEDI_SETRSUBD:
437 case COMEDI_SETWSUBD:
438 /* No translation needed. */
439 rc = translated_ioctl(file, cmd, arg);
441 case COMEDI32_CHANINFO:
442 rc = compat_chaninfo(file, arg);
444 case COMEDI32_RANGEINFO:
445 rc = compat_rangeinfo(file, arg);
448 rc = compat_cmd(file, arg);
450 case COMEDI32_CMDTEST:
451 rc = compat_cmdtest(file, arg);
453 case COMEDI32_INSNLIST:
454 rc = compat_insnlist(file, arg);
457 rc = compat_insn(file, arg);