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12166 resync smatch to 0.6.1-rc1-il-3
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--- old/usr/src/tools/smatch/src/smatch_buf_size.c
+++ new/usr/src/tools/smatch/src/smatch_buf_size.c
1 1 /*
2 2 * Copyright (C) 2010 Dan Carpenter.
3 3 *
4 4 * This program is free software; you can redistribute it and/or
5 5 * modify it under the terms of the GNU General Public License
6 6 * as published by the Free Software Foundation; either version 2
7 7 * of the License, or (at your option) any later version.
8 8 *
9 9 * This program is distributed in the hope that it will be useful,
10 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 12 * GNU General Public License for more details.
13 13 *
14 14 * You should have received a copy of the GNU General Public License
15 15 * along with this program; if not, see http://www.gnu.org/copyleft/gpl.txt
16 16 */
17 17
18 18 #include <stdlib.h>
19 19 #include <errno.h>
20 20 #include "parse.h"
21 21 #include "smatch.h"
22 22 #include "smatch_slist.h"
23 23 #include "smatch_extra.h"
24 24 #include "smatch_function_hashtable.h"
25 25
26 26 #define UNKNOWN_SIZE -1
27 27
28 28 static int my_size_id;
29 29
30 30 static DEFINE_HASHTABLE_INSERT(insert_func, char, int);
31 31 static DEFINE_HASHTABLE_SEARCH(search_func, char, int);
32 32 static struct hashtable *allocation_funcs;
33 33
34 34 static char *get_fn_name(struct expression *expr)
35 35 {
36 36 if (expr->type != EXPR_CALL)
37 37 return NULL;
38 38 if (expr->fn->type != EXPR_SYMBOL)
39 39 return NULL;
40 40 return expr_to_var(expr->fn);
41 41 }
42 42
43 43 static int is_allocation_function(struct expression *expr)
44 44 {
45 45 char *func;
46 46 int ret = 0;
47 47
48 48 func = get_fn_name(expr);
49 49 if (!func)
50 50 return 0;
51 51 if (search_func(allocation_funcs, func))
52 52 ret = 1;
53 53 free_string(func);
54 54 return ret;
55 55 }
56 56
57 57 static void add_allocation_function(const char *func, void *call_back, int param)
58 58 {
59 59 insert_func(allocation_funcs, (char *)func, (int *)1);
60 60 add_function_assign_hook(func, call_back, INT_PTR(param));
61 61 }
62 62
63 63 static int estate_to_size(struct smatch_state *state)
64 64 {
65 65 sval_t sval;
66 66
67 67 if (!state || !estate_rl(state))
68 68 return 0;
69 69 sval = estate_max(state);
70 70 return sval.value;
71 71 }
72 72
73 73 static struct smatch_state *size_to_estate(int size)
74 74 {
75 75 sval_t sval;
76 76
77 77 sval.type = &int_ctype;
78 78 sval.value = size;
79 79
80 80 return alloc_estate_sval(sval);
81 81 }
82 82
83 83 static struct range_list *size_to_rl(int size)
84 84 {
85 85 sval_t sval;
86 86
87 87 sval.type = &int_ctype;
88 88 sval.value = size;
89 89
90 90 return alloc_rl(sval, sval);
91 91 }
92 92
93 93 static struct smatch_state *unmatched_size_state(struct sm_state *sm)
94 94 {
95 95 return size_to_estate(UNKNOWN_SIZE);
96 96 }
97 97
98 98 static void set_size_undefined(struct sm_state *sm, struct expression *mod_expr)
99 99 {
100 100 set_state(sm->owner, sm->name, sm->sym, size_to_estate(UNKNOWN_SIZE));
101 101 }
102 102
103 103 static struct smatch_state *merge_size_func(struct smatch_state *s1, struct smatch_state *s2)
104 104 {
105 105 return merge_estates(s1, s2);
106 106 }
107 107
108 108 void set_param_buf_size(const char *name, struct symbol *sym, char *key, char *value)
109 109 {
110 110 struct range_list *rl = NULL;
111 111 struct smatch_state *state;
112 112 char fullname[256];
113 113
114 114 if (strncmp(key, "$", 1) != 0)
115 115 return;
116 116
117 117 snprintf(fullname, 256, "%s%s", name, key + 1);
118 118
119 119 str_to_rl(&int_ctype, value, &rl);
120 120 if (!rl || is_whole_rl(rl))
121 121 return;
122 122 state = alloc_estate_rl(rl);
123 123 set_state(my_size_id, fullname, sym, state);
124 124 }
125 125
126 126 static int bytes_per_element(struct expression *expr)
127 127 {
128 128 struct symbol *type;
129 129
130 130 if (!expr)
131 131 return 0;
132 132 if (expr->type == EXPR_STRING)
133 133 return 1;
134 134 if (expr->type == EXPR_PREOP && expr->op == '&') {
135 135 type = get_type(expr->unop);
136 136 if (type && type->type == SYM_ARRAY)
137 137 expr = expr->unop;
138 138 }
139 139 type = get_type(expr);
140 140 if (!type)
141 141 return 0;
142 142
143 143 if (type->type != SYM_PTR && type->type != SYM_ARRAY)
144 144 return 0;
145 145
146 146 type = get_base_type(type);
147 147 return type_bytes(type);
148 148 }
149 149
150 150 static int bytes_to_elements(struct expression *expr, int bytes)
151 151 {
152 152 int bpe;
153 153
154 154 bpe = bytes_per_element(expr);
155 155 if (bpe == 0)
156 156 return 0;
157 157 return bytes / bpe;
158 158 }
159 159
160 160 static int elements_to_bytes(struct expression *expr, int elements)
161 161 {
162 162 int bpe;
163 163
164 164 bpe = bytes_per_element(expr);
165 165 return elements * bpe;
166 166 }
167 167
168 168 static int get_initializer_size(struct expression *expr)
169 169 {
170 170 switch (expr->type) {
171 171 case EXPR_STRING:
172 172 return expr->string->length;
173 173 case EXPR_INITIALIZER: {
174 174 struct expression *tmp;
175 175 int i = 0;
176 176
177 177 FOR_EACH_PTR(expr->expr_list, tmp) {
178 178 if (tmp->type == EXPR_INDEX) {
179 179 if (tmp->idx_to >= i)
180 180 i = tmp->idx_to;
181 181 else
182 182 continue;
183 183 }
184 184
185 185 i++;
186 186 } END_FOR_EACH_PTR(tmp);
187 187 return i;
188 188 }
189 189 case EXPR_SYMBOL:
190 190 return get_array_size(expr);
191 191 }
192 192 return 0;
193 193 }
194 194
195 195 static struct range_list *db_size_rl;
196 196 static int db_size_callback(void *unused, int argc, char **argv, char **azColName)
197 197 {
198 198 struct range_list *tmp = NULL;
199 199
200 200 if (!db_size_rl) {
201 201 str_to_rl(&int_ctype, argv[0], &db_size_rl);
202 202 } else {
203 203 str_to_rl(&int_ctype, argv[0], &tmp);
204 204 db_size_rl = rl_union(db_size_rl, tmp);
205 205 }
206 206 return 0;
207 207 }
208 208
209 209 static struct range_list *size_from_db_type(struct expression *expr)
210 210 {
211 211 int this_file_only = 0;
212 212 char *name;
213 213
214 214 name = get_member_name(expr);
215 215 if (!name && is_static(expr)) {
216 216 name = expr_to_var(expr);
217 217 this_file_only = 1;
218 218 }
219 219 if (!name)
220 220 return NULL;
221 221
222 222 if (this_file_only) {
223 223 db_size_rl = NULL;
224 224 run_sql(db_size_callback, NULL,
225 225 "select size from function_type_size where type = '%s' and file = '%s';",
226 226 name, get_filename());
227 227 if (db_size_rl)
228 228 return db_size_rl;
229 229 return NULL;
230 230 }
231 231
232 232 db_size_rl = NULL;
233 233 run_sql(db_size_callback, NULL,
234 234 "select size from type_size where type = '%s';",
235 235 name);
236 236 return db_size_rl;
237 237 }
238 238
239 239 static struct range_list *size_from_db_symbol(struct expression *expr)
240 240 {
241 241 struct symbol *sym;
242 242
243 243 if (expr->type != EXPR_SYMBOL)
244 244 return NULL;
245 245 sym = expr->symbol;
246 246 if (!sym || !sym->ident ||
247 247 !(sym->ctype.modifiers & MOD_TOPLEVEL) ||
248 248 sym->ctype.modifiers & MOD_STATIC)
249 249 return NULL;
250 250
251 251 db_size_rl = NULL;
252 252 run_sql(db_size_callback, NULL,
253 253 "select value from data_info where file = 'extern' and data = '%s' and type = %d;",
254 254 sym->ident->name, BUF_SIZE);
255 255 return db_size_rl;
256 256 }
257 257
258 258 static struct range_list *size_from_db(struct expression *expr)
259 259 {
260 260 struct range_list *rl;
261 261
262 262 rl = size_from_db_symbol(expr);
263 263 if (rl)
264 264 return rl;
265 265 return size_from_db_type(expr);
266 266 }
267 267
268 268 static void db_returns_buf_size(struct expression *expr, int param, char *unused, char *math)
269 269 {
270 270 struct expression *call;
271 271 struct range_list *rl;
272 272
273 273 if (expr->type != EXPR_ASSIGNMENT)
274 274 return;
275 275 call = strip_expr(expr->right);
276 276
277 277 call_results_to_rl(call, &int_ctype, math, &rl);
278 278 rl = cast_rl(&int_ctype, rl);
279 279 set_state_expr(my_size_id, expr->left, alloc_estate_rl(rl));
280 280 }
281 281
282 282 static int get_real_array_size_from_type(struct symbol *type)
283 283 {
284 284 sval_t sval;
285 285
286 286 if (!type)
287 287 return 0;
288 288 if (!type || type->type != SYM_ARRAY)
289 289 return 0;
290 290
291 291 if (!get_implied_value(type->array_size, &sval))
292 292 return 0;
293 293
294 294 return sval.value;
295 295 }
296 296
297 297 int get_real_array_size(struct expression *expr)
298 298 {
299 299 if (!expr)
300 300 return 0;
301 301 if (expr->type == EXPR_PREOP && expr->op == '&')
302 302 expr = expr->unop;
303 303 if (expr->type == EXPR_BINOP) /* array elements foo[5] */
304 304 return 0;
305 305 return get_real_array_size_from_type(get_type(expr));
306 306 }
307 307
308 308 static int get_size_from_initializer(struct expression *expr)
309 309 {
310 310 if (expr->type != EXPR_SYMBOL || !expr->symbol || !expr->symbol->initializer)
311 311 return 0;
312 312 if (expr->symbol->initializer == expr) /* int a = a; */
313 313 return 0;
314 314 return get_initializer_size(expr->symbol->initializer);
315 315 }
316 316
317 317 static struct range_list *get_stored_size_bytes(struct expression *expr)
318 318 {
319 319 struct smatch_state *state;
320 320
321 321 state = get_state_expr(my_size_id, expr);
322 322 if (!state)
323 323 return NULL;
324 324 return estate_rl(state);
325 325 }
326 326
327 327 static int get_bytes_from_address(struct expression *expr)
328 328 {
329 329 struct symbol *type;
330 330 int ret;
331 331
332 332 if (expr->type != EXPR_PREOP || expr->op != '&')
333 333 return 0;
334 334 type = get_type(expr);
335 335 if (!type)
336 336 return 0;
337 337
338 338 if (type->type == SYM_PTR)
339 339 type = get_base_type(type);
340 340
341 341 ret = type_bytes(type);
342 342 if (ret == 1)
343 343 return 0; /* ignore char pointers */
344 344
345 345 return ret;
346 346 }
347 347
348 348 static struct expression *remove_addr_fluff(struct expression *expr)
349 349 {
350 350 struct expression *tmp;
351 351 sval_t sval;
352 352
353 353 expr = strip_expr(expr);
354 354
355 355 /* remove '&' and '*' operations that cancel */
356 356 while (expr && expr->type == EXPR_PREOP && expr->op == '&') {
357 357 tmp = strip_expr(expr->unop);
358 358 if (tmp->type != EXPR_PREOP)
359 359 break;
360 360 if (tmp->op != '*')
361 361 break;
362 362 expr = strip_expr(tmp->unop);
363 363 }
364 364
365 365 if (!expr)
366 366 return NULL;
367 367
368 368 /* "foo + 0" is just "foo" */
369 369 if (expr->type == EXPR_BINOP && expr->op == '+' &&
370 370 get_value(expr->right, &sval) && sval.value == 0)
371 371 return expr->left;
372 372
373 373 return expr;
374 374 }
375 375
376 376 static int is_last_member_of_struct(struct symbol *sym, struct ident *member)
377 377 {
378 378 struct symbol *tmp;
379 379 int i;
380 380
381 381 i = 0;
382 382 FOR_EACH_PTR_REVERSE(sym->symbol_list, tmp) {
383 383 if (i++ || !tmp->ident)
384 384 return 0;
385 385 if (tmp->ident == member)
386 386 return 1;
387 387 return 0;
388 388 } END_FOR_EACH_PTR_REVERSE(tmp);
389 389
390 390 return 0;
391 391 }
392 392
393 393 int last_member_is_resizable(struct symbol *sym)
394 394 {
395 395 struct symbol *last_member;
396 396 struct symbol *type;
397 397 sval_t sval;
398 398
399 399 if (!sym || sym->type != SYM_STRUCT)
400 400 return 0;
401 401
402 402 last_member = last_ptr_list((struct ptr_list *)sym->symbol_list);
403 403 if (!last_member || !last_member->ident)
404 404 return 0;
405 405
406 406 type = get_real_base_type(last_member);
407 407 if (type->type == SYM_STRUCT)
408 408 return last_member_is_resizable(type);
409 409 if (type->type != SYM_ARRAY)
410 410 return 0;
411 411
412 412 if (!get_implied_value(type->array_size, &sval))
413 413 return 0;
414 414
415 415 if (sval.value != 0 && sval.value != 1)
416 416 return 0;
417 417
418 418 return 1;
419 419 }
420 420
421 421 static int get_stored_size_end_struct_bytes(struct expression *expr)
422 422 {
423 423 struct symbol *sym;
424 424 struct symbol *base_sym;
425 425 struct smatch_state *state;
426 426
427 427 if (expr->type == EXPR_BINOP) /* array elements foo[5] */
428 428 return 0;
429 429
430 430 if (expr->type == EXPR_PREOP && expr->op == '&')
431 431 expr = strip_parens(expr->unop);
432 432
433 433 sym = expr_to_sym(expr);
434 434 if (!sym || !sym->ident)
435 435 return 0;
436 436 if (!type_bytes(sym))
437 437 return 0;
438 438 if (sym->type != SYM_NODE)
439 439 return 0;
440 440
441 441 base_sym = get_real_base_type(sym);
442 442 if (!base_sym || base_sym->type != SYM_PTR)
443 443 return 0;
444 444 base_sym = get_real_base_type(base_sym);
445 445 if (!base_sym || base_sym->type != SYM_STRUCT)
446 446 return 0;
447 447
448 448 if (!is_last_member_of_struct(base_sym, expr->member))
449 449 return 0;
450 450 if (!last_member_is_resizable(base_sym))
451 451 return 0;
452 452
453 453 state = get_state(my_size_id, sym->ident->name, sym);
454 454 if (!estate_to_size(state))
455 455 return 0;
456 456
457 457 return estate_to_size(state) - type_bytes(base_sym) + type_bytes(get_type(expr));
458 458 }
459 459
460 460 static struct range_list *alloc_int_rl(int value)
461 461 {
462 462 sval_t sval = {
463 463 .type = &int_ctype,
464 464 {.value = value},
465 465 };
466 466
467 467 return alloc_rl(sval, sval);
468 468 }
469 469
470 470 struct range_list *get_array_size_bytes_rl(struct expression *expr)
471 471 {
472 472 struct range_list *ret = NULL;
473 473 sval_t sval;
474 474 int size;
475 475
476 476 expr = remove_addr_fluff(expr);
477 477 if (!expr)
478 478 return NULL;
479 479
480 480 /* "BAR" */
481 481 if (expr->type == EXPR_STRING)
482 482 return alloc_int_rl(expr->string->length);
483 483
484 484 if (expr->type == EXPR_BINOP && expr->op == '+') {
485 485 sval_t offset;
486 486 struct symbol *type;
487 487 int bytes;
488 488
489 489 if (!get_implied_value(expr->right, &offset))
490 490 return NULL;
491 491 type = get_type(expr->left);
492 492 if (!type)
493 493 return NULL;
494 494 if (type->type != SYM_ARRAY && type->type != SYM_PTR)
495 495 return NULL;
496 496 type = get_real_base_type(type);
497 497 bytes = type_bytes(type);
498 498 if (bytes == 0)
499 499 return NULL;
500 500 offset.value *= bytes;
501 501 size = get_array_size_bytes(expr->left);
502 502 if (size <= 0)
503 503 return NULL;
504 504 return alloc_int_rl(size - offset.value);
505 505 }
506 506
507 507 size = get_stored_size_end_struct_bytes(expr);
508 508 if (size)
509 509 return alloc_int_rl(size);
510 510
511 511 /* buf[4] */
512 512 size = get_real_array_size(expr);
513 513 if (size)
514 514 return alloc_int_rl(elements_to_bytes(expr, size));
515 515
516 516 /* buf = malloc(1024); */
517 517 ret = get_stored_size_bytes(expr);
518 518 if (ret)
519 519 return ret;
520 520
521 521 /* char *foo = "BAR" */
522 522 size = get_size_from_initializer(expr);
523 523 if (size)
524 524 return alloc_int_rl(elements_to_bytes(expr, size));
525 525
526 526 size = get_bytes_from_address(expr);
527 527 if (size)
528 528 return alloc_int_rl(size);
529 529
530 530 ret = size_from_db(expr);
531 531 if (rl_to_sval(ret, &sval) && sval.value == -1)
532 532 return NULL;
533 533 if (ret)
534 534 return ret;
535 535
536 536 return NULL;
537 537 }
538 538
539 539 int get_array_size_bytes(struct expression *expr)
540 540 {
541 541 struct range_list *rl;
542 542 sval_t sval;
543 543
544 544 rl = get_array_size_bytes_rl(expr);
545 545 if (!rl_to_sval(rl, &sval))
546 546 return 0;
547 547 if (sval.uvalue >= INT_MAX)
548 548 return 0;
549 549 return sval.value;
550 550 }
551 551
552 552 int get_array_size_bytes_max(struct expression *expr)
553 553 {
554 554 struct range_list *rl;
555 555 sval_t bytes;
556 556
557 557 rl = get_array_size_bytes_rl(expr);
558 558 if (!rl)
559 559 return 0;
560 560 bytes = rl_min(rl);
561 561 if (bytes.value < 0)
562 562 return 0;
563 563 bytes = rl_max(rl);
564 564 if (bytes.uvalue >= INT_MAX)
565 565 return 0;
566 566 return bytes.value;
567 567 }
568 568
569 569 int get_array_size_bytes_min(struct expression *expr)
570 570 {
571 571 struct range_list *rl;
572 572 struct data_range *range;
573 573
574 574 rl = get_array_size_bytes_rl(expr);
575 575 if (!rl)
576 576 return 0;
577 577
578 578 FOR_EACH_PTR(rl, range) {
579 579 if (range->min.value <= 0)
580 580 return 0;
581 581 if (range->max.value <= 0)
582 582 return 0;
583 583 if (range->min.uvalue >= INT_MAX)
584 584 return 0;
585 585 return range->min.value;
586 586 } END_FOR_EACH_PTR(range);
587 587
588 588 return 0;
589 589 }
590 590
591 591 int get_array_size(struct expression *expr)
592 592 {
593 593 if (!expr)
594 594 return 0;
595 595 return bytes_to_elements(expr, get_array_size_bytes_max(expr));
596 596 }
597 597
598 598 static struct expression *strip_ampersands(struct expression *expr)
599 599 {
600 600 struct symbol *type;
601 601
602 602 if (expr->type != EXPR_PREOP)
603 603 return expr;
604 604 if (expr->op != '&')
605 605 return expr;
606 606 type = get_type(expr->unop);
607 607 if (!type || type->type != SYM_ARRAY)
608 608 return expr;
609 609 return expr->unop;
610 610 }
611 611
612 612 static void info_record_alloction(struct expression *buffer, struct range_list *rl)
613 613 {
614 614 char *name;
615 615
616 616 if (!option_info)
617 617 return;
618 618
619 619 name = get_member_name(buffer);
620 620 if (!name && is_static(buffer))
621 621 name = expr_to_var(buffer);
622 622 if (!name)
623 623 return;
624 624 if (rl && !is_whole_rl(rl))
625 625 sql_insert_function_type_size(name, show_rl(rl));
626 626 else
627 627 sql_insert_function_type_size(name, "(-1)");
628 628
629 629 free_string(name);
630 630 }
631 631
632 632 static void store_alloc(struct expression *expr, struct range_list *rl)
633 633 {
634 634 struct symbol *type;
635 635
636 636 rl = clone_rl(rl); // FIXME!!!
637 637 if (!rl)
638 638 rl = size_to_rl(UNKNOWN_SIZE);
639 639 set_state_expr(my_size_id, expr, alloc_estate_rl(rl));
640 640
641 641 type = get_type(expr);
642 642 if (!type)
643 643 return;
644 644 if (type->type != SYM_PTR)
645 645 return;
646 646 type = get_real_base_type(type);
647 647 if (!type)
648 648 return;
649 649 if (type == &void_ctype)
650 650 return;
651 651 if (type->type != SYM_BASETYPE && type->type != SYM_PTR)
652 652 return;
653 653
654 654 info_record_alloction(expr, rl);
655 655 }
656 656
657 657 static void match_array_assignment(struct expression *expr)
658 658 {
659 659 struct expression *left;
660 660 struct expression *right;
661 661 char *left_member, *right_member;
662 662 struct range_list *rl;
663 663 sval_t sval;
664 664
665 665 if (expr->op != '=')
666 666 return;
667 667 left = strip_expr(expr->left);
668 668 right = strip_expr(expr->right);
669 669 right = strip_ampersands(right);
670 670
671 671 if (!is_pointer(left))
672 672 return;
673 673 if (is_allocation_function(right))
674 674 return;
675 675
676 676 left_member = get_member_name(left);
677 677 right_member = get_member_name(right);
678 678 if (left_member && right_member && strcmp(left_member, right_member) == 0) {
679 679 free_string(left_member);
680 680 free_string(right_member);
681 681 return;
682 682 }
683 683 free_string(left_member);
684 684 free_string(right_member);
685 685
686 686 if (get_implied_value(right, &sval) && sval.value == 0) {
687 687 rl = alloc_int_rl(0);
688 688 goto store;
689 689 }
690 690
691 691 rl = get_array_size_bytes_rl(right);
692 692 if (!rl && __in_fake_assign)
693 693 return;
694 694
695 695 store:
696 696 store_alloc(left, rl);
697 697 }
698 698
699 699 static void match_alloc(const char *fn, struct expression *expr, void *_size_arg)
700 700 {
701 701 int size_arg = PTR_INT(_size_arg);
702 702 struct expression *right;
703 703 struct expression *arg;
704 704 struct range_list *rl;
705 705
706 706 right = strip_expr(expr->right);
707 707 arg = get_argument_from_call_expr(right->args, size_arg);
708 708 get_absolute_rl(arg, &rl);
709 709 rl = cast_rl(&int_ctype, rl);
710 710 store_alloc(expr->left, rl);
711 711 }
712 712
713 713 static void match_calloc(const char *fn, struct expression *expr, void *unused)
714 714 {
715 715 struct expression *right;
716 716 struct expression *size, *nr, *mult;
717 717 struct range_list *rl;
718 718
719 719 right = strip_expr(expr->right);
720 720 nr = get_argument_from_call_expr(right->args, 0);
721 721 size = get_argument_from_call_expr(right->args, 1);
722 722 mult = binop_expression(nr, '*', size);
723 723 if (get_implied_rl(mult, &rl))
724 724 store_alloc(expr->left, rl);
725 725 else
726 726 store_alloc(expr->left, size_to_rl(UNKNOWN_SIZE));
727 727 }
728 728
729 729 static void match_page(const char *fn, struct expression *expr, void *_unused)
730 730 {
731 731 sval_t page_size = {
732 732 .type = &int_ctype,
733 733 {.value = 4096},
734 734 };
735 735
736 736 store_alloc(expr->left, alloc_rl(page_size, page_size));
737 737 }
738 738
739 739 static void match_strndup(const char *fn, struct expression *expr, void *unused)
740 740 {
741 741 struct expression *fn_expr;
742 742 struct expression *size_expr;
743 743 sval_t size;
744 744
745 745 fn_expr = strip_expr(expr->right);
746 746 size_expr = get_argument_from_call_expr(fn_expr->args, 1);
747 747 if (get_implied_max(size_expr, &size)) {
748 748 size.value++;
749 749 store_alloc(expr->left, size_to_rl(size.value));
750 750 } else {
751 751 store_alloc(expr->left, size_to_rl(UNKNOWN_SIZE));
752 752 }
753 753
754 754 }
755 755
756 756 static void match_alloc_pages(const char *fn, struct expression *expr, void *_order_arg)
757 757 {
758 758 int order_arg = PTR_INT(_order_arg);
759 759 struct expression *right;
760 760 struct expression *arg;
761 761 sval_t sval;
762 762
763 763 right = strip_expr(expr->right);
764 764 arg = get_argument_from_call_expr(right->args, order_arg);
765 765 if (!get_implied_value(arg, &sval))
766 766 return;
767 767 if (sval.value < 0 || sval.value > 10)
768 768 return;
769 769
770 770 sval.type = &int_ctype;
771 771 sval.value = 1 << sval.value;
772 772 sval.value *= 4096;
773 773
774 774 store_alloc(expr->left, alloc_rl(sval, sval));
775 775 }
776 776
777 777 static int is_type_bytes(struct range_list *rl, struct expression *arg)
778 778 {
779 779 struct symbol *type;
780 780 sval_t sval;
781 781
782 782 if (!rl_to_sval(rl, &sval))
783 783 return 0;
784 784
785 785 type = get_type(arg);
786 786 if (!type)
787 787 return 0;
788 788 if (type->type != SYM_PTR)
789 789 return 0;
790 790 type = get_real_base_type(type);
791 791 if (type->type != SYM_STRUCT &&
792 792 type->type != SYM_UNION)
793 793 return 0;
794 794 if (sval.value != type_bytes(type))
795 795 return 0;
796 796 return 1;
797 797 }
798 798
799 799 static void match_call(struct expression *expr)
800 800 {
801 801 struct expression *arg;
802 802 struct symbol *type;
803 803 struct range_list *rl;
804 804 int i;
805 805
806 806 i = -1;
807 807 FOR_EACH_PTR(expr->args, arg) {
808 808 i++;
809 809 type = get_type(arg);
810 810 if (!type || (type->type != SYM_PTR && type->type != SYM_ARRAY))
811 811 continue;
812 812 rl = get_array_size_bytes_rl(arg);
813 813 if (!rl)
814 814 continue;
815 815 if (is_whole_rl(rl))
816 816 continue;
817 817 if (is_type_bytes(rl, arg))
818 818 continue;
819 819 sql_insert_caller_info(expr, BUF_SIZE, i, "$", show_rl(rl));
820 820 } END_FOR_EACH_PTR(arg);
821 821 }
822 822
823 823 static void struct_member_callback(struct expression *call, int param, char *printed_name, struct sm_state *sm)
824 824 {
825 825 sval_t sval;
826 826
827 827 if (!estate_rl(sm->state) ||
828 828 (estate_get_single_value(sm->state, &sval) &&
829 829 (sval.value == -1 || sval.value == 0)))
830 830 return;
831 831
832 832 sql_insert_caller_info(call, BUF_SIZE, param, printed_name, sm->state->name);
833 833 }
834 834
835 835 /*
836 836 * This is slightly (very) weird because half of this stuff is handled in
837 837 * smatch_parse_call_math.c which is poorly named. But anyway, add some buf
838 838 * sizes here.
839 839 *
840 840 */
841 841 static void print_returned_allocations(int return_id, char *return_ranges, struct expression *expr)
842 842 {
843 843 const char *param_math;
844 844 struct range_list *rl;
845 845 char buf[64];
846 846 sval_t sval;
847 847
848 848 rl = get_array_size_bytes_rl(expr);
849 849 param_math = get_allocation_math(expr);
850 850 if (!rl && !param_math)
851 851 return;
852 852
853 853 if (!param_math &&
854 854 rl_to_sval(rl, &sval) &&
855 855 (sval.value == -1 || sval.value == 0))
856 856 return;
857 857
858 858 if (param_math)
859 859 snprintf(buf, sizeof(buf), "%s[%s]", show_rl(rl), param_math);
860 860 else
861 861 snprintf(buf, sizeof(buf), "%s", show_rl(rl));
862 862
863 863 // FIXME: don't store if you can guess the size from the type
864 864 // FIXME: return if we allocate a parameter $0->bar
865 865 sql_insert_return_states(return_id, return_ranges, BUF_SIZE, -1, "", buf);
866 866 }
867 867
868 868 static void record_global_size(struct symbol *sym)
869 869 {
870 870 int bytes;
871 871 char buf[16];
872 872
873 873 if (!sym->ident)
874 874 return;
875 875
876 876 if (!(sym->ctype.modifiers & MOD_TOPLEVEL) ||
877 877 sym->ctype.modifiers & MOD_STATIC)
878 878 return;
879 879
880 880 bytes = get_array_size_bytes(symbol_expression(sym));
881 881 if (bytes <= 1)
882 882 return;
883 883
884 884 snprintf(buf, sizeof(buf), "%d", bytes);
885 885 sql_insert_data_info_var_sym(sym->ident->name, sym, BUF_SIZE, buf);
886 886 }
887 887
888 888 void register_buf_size(int id)
889 889 {
890 890 my_size_id = id;
891 891
892 892 set_dynamic_states(my_size_id);
893 893
894 894 add_unmatched_state_hook(my_size_id, &unmatched_size_state);
895 895 add_merge_hook(my_size_id, &merge_estates);
896 896
897 897 select_caller_info_hook(set_param_buf_size, BUF_SIZE);
898 898 select_return_states_hook(BUF_SIZE, &db_returns_buf_size);
899 899 add_split_return_callback(print_returned_allocations);
900 900
901 901 allocation_funcs = create_function_hashtable(100);
902 902 add_allocation_function("malloc", &match_alloc, 0);
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903 903 add_allocation_function("calloc", &match_calloc, 0);
904 904 add_allocation_function("memdup", &match_alloc, 1);
905 905 add_allocation_function("realloc", &match_alloc, 1);
906 906 if (option_project == PROJ_KERNEL) {
907 907 add_allocation_function("kmalloc", &match_alloc, 0);
908 908 add_allocation_function("kmalloc_node", &match_alloc, 0);
909 909 add_allocation_function("kzalloc", &match_alloc, 0);
910 910 add_allocation_function("kzalloc_node", &match_alloc, 0);
911 911 add_allocation_function("vmalloc", &match_alloc, 0);
912 912 add_allocation_function("__vmalloc", &match_alloc, 0);
913 + add_allocation_function("kvmalloc", &match_alloc, 0);
913 914 add_allocation_function("kcalloc", &match_calloc, 0);
914 915 add_allocation_function("kmalloc_array", &match_calloc, 0);
915 916 add_allocation_function("drm_malloc_ab", &match_calloc, 0);
916 917 add_allocation_function("drm_calloc_large", &match_calloc, 0);
917 918 add_allocation_function("sock_kmalloc", &match_alloc, 1);
918 919 add_allocation_function("kmemdup", &match_alloc, 1);
919 920 add_allocation_function("kmemdup_user", &match_alloc, 1);
920 921 add_allocation_function("dma_alloc_attrs", &match_alloc, 1);
921 922 add_allocation_function("pci_alloc_consistent", &match_alloc, 1);
922 923 add_allocation_function("pci_alloc_coherent", &match_alloc, 1);
923 924 add_allocation_function("devm_kmalloc", &match_alloc, 1);
924 925 add_allocation_function("devm_kzalloc", &match_alloc, 1);
925 926 add_allocation_function("krealloc", &match_alloc, 1);
926 927 add_allocation_function("__alloc_bootmem", &match_alloc, 0);
927 928 add_allocation_function("alloc_bootmem", &match_alloc, 0);
928 929 add_allocation_function("kmap", &match_page, 0);
929 930 add_allocation_function("kmap_atomic", &match_page, 0);
930 931 add_allocation_function("get_zeroed_page", &match_page, 0);
931 932 add_allocation_function("alloc_page", &match_page, 0);
932 933 add_allocation_function("alloc_pages", &match_alloc_pages, 1);
933 934 add_allocation_function("alloc_pages_current", &match_alloc_pages, 1);
934 935 add_allocation_function("__get_free_pages", &match_alloc_pages, 1);
935 936 add_allocation_function("dma_alloc_contiguous", &match_alloc, 1);
936 937 add_allocation_function("dma_alloc_coherent", &match_alloc, 1);
937 938 }
938 939
939 940 add_allocation_function("strndup", match_strndup, 0);
940 941 if (option_project == PROJ_KERNEL)
941 942 add_allocation_function("kstrndup", match_strndup, 0);
942 943
943 944 add_modification_hook(my_size_id, &set_size_undefined);
944 945
945 946 add_merge_hook(my_size_id, &merge_size_func);
946 947
947 948 if (option_info)
948 949 add_hook(record_global_size, BASE_HOOK);
949 950 }
950 951
951 952 void register_buf_size_late(int id)
952 953 {
953 954 /* has to happen after match_alloc() */
954 955 add_hook(&match_array_assignment, ASSIGNMENT_HOOK);
955 956
956 957 add_hook(&match_call, FUNCTION_CALL_HOOK);
957 958 add_member_info_callback(my_size_id, struct_member_callback);
958 959 }
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