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
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
|
/*
* Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include "internal/cryptlib.h"
#include "internal/thread_once.h"
#include <openssl/crypto.h>
#include <openssl/buffer.h>
#include "internal/bio.h"
#include <openssl/lhash.h>
#ifndef OPENSSL_NO_CRYPTO_MDEBUG_BACKTRACE
# include <execinfo.h>
#endif
/*
* The state changes to CRYPTO_MEM_CHECK_ON | CRYPTO_MEM_CHECK_ENABLE when
* the application asks for it (usually after library initialisation for
* which no book-keeping is desired). State CRYPTO_MEM_CHECK_ON exists only
* temporarily when the library thinks that certain allocations should not be
* checked (e.g. the data structures used for memory checking). It is not
* suitable as an initial state: the library will unexpectedly enable memory
* checking when it executes one of those sections that want to disable
* checking temporarily. State CRYPTO_MEM_CHECK_ENABLE without ..._ON makes
* no sense whatsoever.
*/
#ifndef OPENSSL_NO_CRYPTO_MDEBUG
static int mh_mode = CRYPTO_MEM_CHECK_OFF;
#endif
#ifndef OPENSSL_NO_CRYPTO_MDEBUG
static unsigned long order = 0; /* number of memory requests */
/*-
* For application-defined information (static C-string `info')
* to be displayed in memory leak list.
* Each thread has its own stack. For applications, there is
* OPENSSL_mem_debug_push("...") to push an entry,
* OPENSSL_mem_debug_pop() to pop an entry,
*/
struct app_mem_info_st {
CRYPTO_THREAD_ID threadid;
const char *file;
int line;
const char *info;
struct app_mem_info_st *next; /* tail of thread's stack */
int references;
};
static CRYPTO_ONCE memdbg_init = CRYPTO_ONCE_STATIC_INIT;
CRYPTO_RWLOCK *memdbg_lock;
static CRYPTO_RWLOCK *long_memdbg_lock;
static CRYPTO_THREAD_LOCAL appinfokey;
/* memory-block description */
struct mem_st {
void *addr;
int num;
const char *file;
int line;
CRYPTO_THREAD_ID threadid;
unsigned long order;
time_t time;
APP_INFO *app_info;
#ifndef OPENSSL_NO_CRYPTO_MDEBUG_BACKTRACE
void *array[30];
size_t array_siz;
#endif
};
/*
* hash-table of memory requests (address as * key); access requires
* long_memdbg_lock lock
*/
static LHASH_OF(MEM) *mh = NULL;
/* num_disable > 0 iff mh_mode == CRYPTO_MEM_CHECK_ON (w/o ..._ENABLE) */
static unsigned int num_disable = 0;
/*
* Valid iff num_disable > 0. long_memdbg_lock is locked exactly in this
* case (by the thread named in disabling_thread).
*/
static CRYPTO_THREAD_ID disabling_threadid;
DEFINE_RUN_ONCE_STATIC(do_memdbg_init)
{
memdbg_lock = CRYPTO_THREAD_lock_new();
long_memdbg_lock = CRYPTO_THREAD_lock_new();
if (memdbg_lock == NULL || long_memdbg_lock == NULL
|| !CRYPTO_THREAD_init_local(&appinfokey, NULL)) {
CRYPTO_THREAD_lock_free(memdbg_lock);
memdbg_lock = NULL;
CRYPTO_THREAD_lock_free(long_memdbg_lock);
long_memdbg_lock = NULL;
return 0;
}
return 1;
}
static void app_info_free(APP_INFO *inf)
{
if (inf == NULL)
return;
if (--(inf->references) <= 0) {
app_info_free(inf->next);
OPENSSL_free(inf);
}
}
#endif
int CRYPTO_mem_ctrl(int mode)
{
#ifdef OPENSSL_NO_CRYPTO_MDEBUG
return mode - mode;
#else
int ret = mh_mode;
if (!RUN_ONCE(&memdbg_init, do_memdbg_init))
return -1;
CRYPTO_THREAD_write_lock(memdbg_lock);
switch (mode) {
default:
break;
case CRYPTO_MEM_CHECK_ON:
mh_mode = CRYPTO_MEM_CHECK_ON | CRYPTO_MEM_CHECK_ENABLE;
num_disable = 0;
break;
case CRYPTO_MEM_CHECK_OFF:
mh_mode = 0;
num_disable = 0;
break;
/* switch off temporarily (for library-internal use): */
case CRYPTO_MEM_CHECK_DISABLE:
if (mh_mode & CRYPTO_MEM_CHECK_ON) {
CRYPTO_THREAD_ID cur = CRYPTO_THREAD_get_current_id();
/* see if we don't have long_memdbg_lock already */
if (!num_disable
|| !CRYPTO_THREAD_compare_id(disabling_threadid, cur)) {
/*
* Long-time lock long_memdbg_lock must not be claimed
* while we're holding memdbg_lock, or we'll deadlock
* if somebody else holds long_memdbg_lock (and cannot
* release it because we block entry to this function). Give
* them a chance, first, and then claim the locks in
* appropriate order (long-time lock first).
*/
CRYPTO_THREAD_unlock(memdbg_lock);
/*
* Note that after we have waited for long_memdbg_lock and
* memdbg_lock, we'll still be in the right "case" and
* "if" branch because MemCheck_start and MemCheck_stop may
* never be used while there are multiple OpenSSL threads.
*/
CRYPTO_THREAD_write_lock(long_memdbg_lock);
CRYPTO_THREAD_write_lock(memdbg_lock);
mh_mode &= ~CRYPTO_MEM_CHECK_ENABLE;
disabling_threadid = cur;
}
num_disable++;
}
break;
case CRYPTO_MEM_CHECK_ENABLE:
if (mh_mode & CRYPTO_MEM_CHECK_ON) {
if (num_disable) { /* always true, or something is going wrong */
num_disable--;
if (num_disable == 0) {
mh_mode |= CRYPTO_MEM_CHECK_ENABLE;
CRYPTO_THREAD_unlock(long_memdbg_lock);
}
}
}
break;
}
CRYPTO_THREAD_unlock(memdbg_lock);
return ret;
#endif
}
#ifndef OPENSSL_NO_CRYPTO_MDEBUG
static int mem_check_on(void)
{
int ret = 0;
CRYPTO_THREAD_ID cur;
if (mh_mode & CRYPTO_MEM_CHECK_ON) {
if (!RUN_ONCE(&memdbg_init, do_memdbg_init))
return 0;
cur = CRYPTO_THREAD_get_current_id();
CRYPTO_THREAD_read_lock(memdbg_lock);
ret = (mh_mode & CRYPTO_MEM_CHECK_ENABLE)
|| !CRYPTO_THREAD_compare_id(disabling_threadid, cur);
CRYPTO_THREAD_unlock(memdbg_lock);
}
return ret;
}
static int mem_cmp(const MEM *a, const MEM *b)
{
#ifdef _WIN64
const char *ap = (const char *)a->addr, *bp = (const char *)b->addr;
if (ap == bp)
return 0;
else if (ap > bp)
return 1;
else
return -1;
#else
return (const char *)a->addr - (const char *)b->addr;
#endif
}
static unsigned long mem_hash(const MEM *a)
{
size_t ret;
ret = (size_t)a->addr;
ret = ret * 17851 + (ret >> 14) * 7 + (ret >> 4) * 251;
return ret;
}
/* returns 1 if there was an info to pop, 0 if the stack was empty. */
static int pop_info(void)
{
APP_INFO *current = NULL;
if (!RUN_ONCE(&memdbg_init, do_memdbg_init))
return 0;
current = (APP_INFO *)CRYPTO_THREAD_get_local(&appinfokey);
if (current != NULL) {
APP_INFO
|