Training courses

Kernel and Embedded Linux

Bootlin training courses

Embedded Linux, kernel,
Yocto Project, Buildroot, real-time,
graphics, boot time, debugging...

Bootlin logo

Elixir Cross Referencer

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
// SPDX-License-Identifier: GPL-2.0+
/*
 * comedi/comedi_compat32.c
 * 32-bit ioctl compatibility for 64-bit comedi kernel module.
 *
 * Author: Ian Abbott, MEV Ltd. <abbotti@mev.co.uk>
 * Copyright (C) 2007 MEV Ltd. <http://www.mev.co.uk/>
 *
 * COMEDI - Linux Control and Measurement Device Interface
 * Copyright (C) 1997-2007 David A. Schleef <ds@schleef.org>
 */

#include <linux/uaccess.h>
#include <linux/compat.h>
#include <linux/fs.h>
#include "comedi.h"
#include "comedi_compat32.h"

#define COMEDI32_CHANINFO _IOR(CIO, 3, struct comedi32_chaninfo_struct)
#define COMEDI32_RANGEINFO _IOR(CIO, 8, struct comedi32_rangeinfo_struct)
/*
 * N.B. COMEDI32_CMD and COMEDI_CMD ought to use _IOWR, not _IOR.
 * It's too late to change it now, but it only affects the command number.
 */
#define COMEDI32_CMD _IOR(CIO, 9, struct comedi32_cmd_struct)
/*
 * N.B. COMEDI32_CMDTEST and COMEDI_CMDTEST ought to use _IOWR, not _IOR.
 * It's too late to change it now, but it only affects the command number.
 */
#define COMEDI32_CMDTEST _IOR(CIO, 10, struct comedi32_cmd_struct)
#define COMEDI32_INSNLIST _IOR(CIO, 11, struct comedi32_insnlist_struct)
#define COMEDI32_INSN _IOR(CIO, 12, struct comedi32_insn_struct)

struct comedi32_chaninfo_struct {
	unsigned int subdev;
	compat_uptr_t maxdata_list;	/* 32-bit 'unsigned int *' */
	compat_uptr_t flaglist;	/* 32-bit 'unsigned int *' */
	compat_uptr_t rangelist;	/* 32-bit 'unsigned int *' */
	unsigned int unused[4];
};

struct comedi32_rangeinfo_struct {
	unsigned int range_type;
	compat_uptr_t range_ptr;	/* 32-bit 'void *' */
};

struct comedi32_cmd_struct {
	unsigned int subdev;
	unsigned int flags;
	unsigned int start_src;
	unsigned int start_arg;
	unsigned int scan_begin_src;
	unsigned int scan_begin_arg;
	unsigned int convert_src;
	unsigned int convert_arg;
	unsigned int scan_end_src;
	unsigned int scan_end_arg;
	unsigned int stop_src;
	unsigned int stop_arg;
	compat_uptr_t chanlist;	/* 32-bit 'unsigned int *' */
	unsigned int chanlist_len;
	compat_uptr_t data;	/* 32-bit 'short *' */
	unsigned int data_len;
};

struct comedi32_insn_struct {
	unsigned int insn;
	unsigned int n;
	compat_uptr_t data;	/* 32-bit 'unsigned int *' */
	unsigned int subdev;
	unsigned int chanspec;
	unsigned int unused[3];
};

struct comedi32_insnlist_struct {
	unsigned int n_insns;
	compat_uptr_t insns;	/* 32-bit 'struct comedi_insn *' */
};

/* Handle translated ioctl. */
static int translated_ioctl(struct file *file, unsigned int cmd,
			    unsigned long arg)
{
	if (file->f_op->unlocked_ioctl)
		return file->f_op->unlocked_ioctl(file, cmd, arg);

	return -ENOTTY;
}

/* Handle 32-bit COMEDI_CHANINFO ioctl. */
static int compat_chaninfo(struct file *file, unsigned long arg)
{
	struct comedi_chaninfo __user *chaninfo;
	struct comedi32_chaninfo_struct __user *chaninfo32;
	int err;
	union {
		unsigned int uint;
		compat_uptr_t uptr;
	} temp;

	chaninfo32 = compat_ptr(arg);
	chaninfo = compat_alloc_user_space(sizeof(*chaninfo));

	/* Copy chaninfo structure.  Ignore unused members. */
	if (!access_ok(chaninfo32, sizeof(*chaninfo32)) ||
	    !access_ok(chaninfo, sizeof(*chaninfo)))
		return -EFAULT;

	err = 0;
	err |= __get_user(temp.uint, &chaninfo32->subdev);
	err |= __put_user(temp.uint, &chaninfo->subdev);
	err |= __get_user(temp.uptr, &chaninfo32->maxdata_list);
	err |= __put_user(compat_ptr(temp.uptr), &chaninfo->maxdata_list);
	err |= __get_user(temp.uptr, &chaninfo32->flaglist);
	err |= __put_user(compat_ptr(temp.uptr), &chaninfo->flaglist);
	err |= __get_user(temp.uptr, &chaninfo32->rangelist);
	err |= __put_user(compat_ptr(temp.uptr), &chaninfo->rangelist);
	if (err)
		return -EFAULT;

	return translated_ioctl(file, COMEDI_CHANINFO, (unsigned long)chaninfo);
}

/* Handle 32-bit COMEDI_RANGEINFO ioctl. */
static int compat_rangeinfo(struct file *file, unsigned long arg)
{
	struct comedi_rangeinfo __user *rangeinfo;
	struct comedi32_rangeinfo_struct __user *rangeinfo32;
	int err;
	union {
		unsigned int uint;
		compat_uptr_t uptr;
	} temp;

	rangeinfo32 = compat_ptr(arg);
	rangeinfo = compat_alloc_user_space(sizeof(*rangeinfo));

	/* Copy rangeinfo structure. */
	if (!access_ok(rangeinfo32, sizeof(*rangeinfo32)) ||
	    !access_ok(rangeinfo, sizeof(*rangeinfo)))
		return -EFAULT;

	err = 0;
	err |= __get_user(temp.uint, &rangeinfo32->range_type);
	err |= __put_user(temp.uint, &rangeinfo->range_type);
	err |= __get_user(temp.uptr, &rangeinfo32->range_ptr);
	err |= __put_user(compat_ptr(temp.uptr), &rangeinfo->range_ptr);
	if (err)
		return -EFAULT;

	return translated_ioctl(file, COMEDI_RANGEINFO,
				(unsigned long)rangeinfo);
}

/* Copy 32-bit cmd structure to native cmd structure. */
static int get_compat_cmd(struct comedi_cmd __user *cmd,
			  struct comedi32_cmd_struct __user *cmd32)
{
	int err;
	union {
		unsigned int uint;
		compat_uptr_t uptr;
	} temp;

	/* Copy cmd structure. */
	if (!access_ok(cmd32, sizeof(*cmd32)) ||
	    !access_ok(cmd, sizeof(*cmd)))
		return -EFAULT;

	err = 0;
	err |= __get_user(temp.uint, &cmd32->subdev);
	err |= __put_user(temp.uint, &cmd->subdev);
	err |= __get_user(temp.uint, &cmd32->flags);
	err |= __put_user(temp.uint, &cmd->flags);
	err |= __get_user(temp.uint, &cmd32->start_src);
	err |= __put_user(temp.uint, &cmd->start_src);
	err |= __get_user(temp.uint, &cmd32->start_arg);
	err |= __put_user(temp.uint, &cmd->start_arg);
	err |= __get_user(temp.uint, &cmd32->scan_begin_src);
	err |= __put_user(temp.uint, &cmd->scan_begin_src);
	err |= __get_user(temp.uint, &cmd32->scan_begin_arg);
	err |= __put_user(temp.uint, &cmd->scan_begin_arg);
	err |= __get_user(temp.uint, &cmd32->convert_src);
	err |= __put_user(temp.uint, &cmd->convert_src);
	err |= __get_user(temp.uint, &cmd32->convert_arg);
	err |= __put_user(temp.uint, &cmd->convert_arg);
	err |= __get_user(temp.uint, &cmd32->scan_end_src);
	err |= __put_user(temp.uint, &cmd->scan_end_src);
	err |= __get_user(temp.uint, &cmd32->scan_end_arg);
	err |= __put_user(temp.uint, &cmd->scan_end_arg);
	err |= __get_user(temp.uint, &cmd32->stop_src);
	err |= __put_user(temp.uint, &cmd->stop_src);
	err |= __get_user(temp.uint, &cmd32->stop_arg);
	err |= __put_user(temp.uint, &cmd->stop_arg);
	err |= __get_user(temp.uptr, &cmd32->chanlist);
	err |= __put_user((unsigned int __force *)compat_ptr(temp.uptr),
			  &cmd->chanlist);
	err |= __get_user(temp.uint, &cmd32->chanlist_len);
	err |= __put_user(temp.uint, &cmd->chanlist_len);
	err |= __get_user(temp.uptr, &cmd32->data);
	err |= __put_user(compat_ptr(temp.uptr), &cmd->data);
	err |= __get_user(temp.uint, &cmd32->data_len);
	err |= __put_user(temp.uint, &cmd->data_len);
	return err ? -EFAULT : 0;
}

/* Copy native cmd structure to 32-bit cmd structure. */
static int put_compat_cmd(struct comedi32_cmd_struct __user *cmd32,
			  struct comedi_cmd __user *cmd)
{
	int err;
	unsigned int temp;

	/*
	 * Copy back most of cmd structure.
	 *
	 * Assume the pointer values are already valid.
	 * (Could use ptr_to_compat() to set them.)
	 */
	if (!access_ok(cmd, sizeof(*cmd)) ||
	    !access_ok(cmd32, sizeof(*cmd32)))
		return -EFAULT;

	err = 0;
	err |= __get_user(temp, &cmd->subdev);
	err |= __put_user(temp, &cmd32->subdev);
	err |= __get_user(temp, &cmd->flags);
	err |= __put_user(temp, &cmd32->flags);
	err |= __get_user(temp, &cmd->start_src);
	err |= __put_user(temp, &cmd32->start_src);
	err |= __get_user(temp, &cmd->start_arg);
	err |= __put_user(temp, &cmd32->start_arg);
	err |= __get_user(temp, &cmd->scan_begin_src);
	err |= __put_user(temp, &cmd32->scan_begin_src);
	err |= __get_user(temp, &cmd->scan_begin_arg);
	err |= __put_user(temp, &cmd32->scan_begin_arg);
	err |= __get_user(temp, &cmd->convert_src);
	err |= __put_user(temp, &cmd32->convert_src);
	err |= __get_user(temp, &cmd->convert_arg);
	err |= __put_user(temp, &cmd32->convert_arg);
	err |= __get_user(temp, &cmd->scan_end_src);
	err |= __put_user(temp, &cmd32->scan_end_src);
	err |= __get_user(temp, &cmd->scan_end_arg);
	err |= __put_user(temp, &cmd32->scan_end_arg);
	err |= __get_user(temp, &cmd->stop_src);
	err |= __put_user(temp, &cmd32->stop_src);
	err |= __get_user(temp, &cmd->stop_arg);
	err |= __put_user(temp, &cmd32->stop_arg);
	/* Assume chanlist pointer is unchanged. */
	err |= __get_user(temp, &cmd->chanlist_len);
	err |= __put_user(temp, &cmd32->chanlist_len);
	/* Assume data pointer is unchanged. */
	err |= __get_user(temp, &cmd->data_len);
	err |= __put_user(temp, &cmd32->data_len);
	return err ? -EFAULT : 0;
}

/* Handle 32-bit COMEDI_CMD ioctl. */
static int compat_cmd(struct file *file, unsigned long arg)
{
	struct comedi_cmd __user *cmd;
	struct comedi32_cmd_struct __user *cmd32;
	int rc, err;

	cmd32 = compat_ptr(arg);
	cmd = compat_alloc_user_space(sizeof(*cmd));

	rc = get_compat_cmd(cmd, cmd32);
	if (rc)
		return rc;

	rc = translated_ioctl(file, COMEDI_CMD, (unsigned long)cmd);
	if (rc == -EAGAIN) {
		/* Special case: copy cmd back to user. */
		err = put_compat_cmd(cmd32, cmd);
		if (err)
			rc = err;
	}

	return rc;
}

/* Handle 32-bit COMEDI_CMDTEST ioctl. */
static int compat_cmdtest(struct file *file, unsigned long arg)
{
	struct comedi_cmd __user *cmd;
	struct comedi32_cmd_struct __user *cmd32;
	int rc, err;

	cmd32 = compat_ptr(arg);
	cmd = compat_alloc_user_space(sizeof(*cmd));

	rc = get_compat_cmd(cmd, cmd32);
	if (rc)
		return rc;

	rc = translated_ioctl(file, COMEDI_CMDTEST, (unsigned long)cmd);
	if (rc < 0)
		return rc;

	err = put_compat_cmd(cmd32, cmd);
	if (err)
		rc = err;

	return rc;
}

/* Copy 32-bit insn structure to native insn structure. */
static int get_compat_insn(struct comedi_insn __user *insn,
			   struct comedi32_insn_struct __user *insn32)
{
	int err;
	union {
		unsigned int uint;
		compat_uptr_t uptr;
	} temp;

	/* Copy insn structure.  Ignore the unused members. */
	err = 0;
	if (!access_ok(insn32, sizeof(*insn32)) ||
	    !access_ok(insn, sizeof(*insn)))
		return -EFAULT;

	err |= __get_user(temp.uint, &insn32->insn);
	err |= __put_user(temp.uint, &insn->insn);
	err |= __get_user(temp.uint, &insn32->n);
	err |= __put_user(temp.uint, &insn->n);
	err |= __get_user(temp.uptr, &insn32->data);
	err |= __put_user(compat_ptr(temp.uptr), &insn->data);
	err |= __get_user(temp.uint, &insn32->subdev);
	err |= __put_user(temp.uint, &insn->subdev);
	err |= __get_user(temp.uint, &insn32->chanspec);
	err |= __put_user(temp.uint, &insn->chanspec);
	return err ? -EFAULT : 0;
}

/* Handle 32-bit COMEDI_INSNLIST ioctl. */
static int compat_insnlist(struct file *file, unsigned long arg)
{
	struct combined_insnlist {
		struct comedi_insnlist insnlist;
		struct comedi_insn insn[1];
	} __user *s;
	struct comedi32_insnlist_struct __user *insnlist32;
	struct comedi32_insn_struct __user *insn32;
	compat_uptr_t uptr;
	unsigned int n_insns, n;
	int err, rc;

	insnlist32 = compat_ptr(arg);

	/* Get 32-bit insnlist structure.  */
	if (!access_ok(insnlist32, sizeof(*insnlist32)))
		return -EFAULT;

	err = 0;
	err |= __get_user(n_insns, &insnlist32->n_insns);
	err |= __get_user(uptr, &insnlist32->insns);
	insn32 = compat_ptr(uptr);
	if (err)
		return -EFAULT;

	/* Allocate user memory to copy insnlist and insns into. */
	s = compat_alloc_user_space(offsetof(struct combined_insnlist,
					     insn[n_insns]));

	/* Set native insnlist structure. */
	if (!access_ok(&s->insnlist, sizeof(s->insnlist)))
		return -EFAULT;

	err |= __put_user(n_insns, &s->insnlist.n_insns);
	err |= __put_user(&s->insn[0], &s->insnlist.insns);
	if (err)
		return -EFAULT;

	/* Copy insn structures. */
	for (n = 0; n < n_insns; n++) {
		rc = get_compat_insn(&s->insn[n], &insn32[n]);
		if (rc)
			return rc;
	}

	return translated_ioctl(file, COMEDI_INSNLIST,
				(unsigned long)&s->insnlist);
}

/* Handle 32-bit COMEDI_INSN ioctl. */
static int compat_insn(struct file *file, unsigned long arg)
{
	struct comedi_insn __user *insn;
	struct comedi32_insn_struct __user *insn32;
	int rc;

	insn32 = compat_ptr(arg);
	insn = compat_alloc_user_space(sizeof(*insn));

	rc = get_compat_insn(insn, insn32);
	if (rc)
		return rc;

	return translated_ioctl(file, COMEDI_INSN, (unsigned long)insn);
}

/*
 * compat_ioctl file operation.
 *
 * Returns -ENOIOCTLCMD for unrecognised ioctl codes.
 */
long comedi_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	int rc;

	switch (cmd) {
	case COMEDI_DEVCONFIG:
	case COMEDI_DEVINFO:
	case COMEDI_SUBDINFO:
	case COMEDI_BUFCONFIG:
	case COMEDI_BUFINFO:
		/* Just need to translate the pointer argument. */
		arg = (unsigned long)compat_ptr(arg);
		rc = translated_ioctl(file, cmd, arg);
		break;
	case COMEDI_LOCK:
	case COMEDI_UNLOCK:
	case COMEDI_CANCEL:
	case COMEDI_POLL:
	case COMEDI_SETRSUBD:
	case COMEDI_SETWSUBD:
		/* No translation needed. */
		rc = translated_ioctl(file, cmd, arg);
		break;
	case COMEDI32_CHANINFO:
		rc = compat_chaninfo(file, arg);
		break;
	case COMEDI32_RANGEINFO:
		rc = compat_rangeinfo(file, arg);
		break;
	case COMEDI32_CMD:
		rc = compat_cmd(file, arg);
		break;
	case COMEDI32_CMDTEST:
		rc = compat_cmdtest(file, arg);
		break;
	case COMEDI32_INSNLIST:
		rc = compat_insnlist(file, arg);
		break;
	case COMEDI32_INSN:
		rc = compat_insn(file, arg);
		break;
	default:
		rc = -ENOIOCTLCMD;
		break;
	}
	return rc;
}