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smatch: check libld_* allocation functions
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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 if (!parse_call_math_rl(call, math, &rl))
278 278 return;
279 279 rl = cast_rl(&int_ctype, rl);
280 280 set_state_expr(my_size_id, expr->left, alloc_estate_rl(rl));
281 281 }
282 282
283 283 static int get_real_array_size_from_type(struct symbol *type)
284 284 {
285 285 sval_t sval;
286 286
287 287 if (!type)
288 288 return 0;
289 289 if (!type || type->type != SYM_ARRAY)
290 290 return 0;
291 291
292 292 if (!get_implied_value(type->array_size, &sval))
293 293 return 0;
294 294
295 295 return sval.value;
296 296 }
297 297
298 298 int get_real_array_size(struct expression *expr)
299 299 {
300 300 if (!expr)
301 301 return 0;
302 302 if (expr->type == EXPR_PREOP && expr->op == '&')
303 303 expr = expr->unop;
304 304 if (expr->type == EXPR_BINOP) /* array elements foo[5] */
305 305 return 0;
306 306 return get_real_array_size_from_type(get_type(expr));
307 307 }
308 308
309 309 static int get_size_from_initializer(struct expression *expr)
310 310 {
311 311 if (expr->type != EXPR_SYMBOL || !expr->symbol || !expr->symbol->initializer)
312 312 return 0;
313 313 if (expr->symbol->initializer == expr) /* int a = a; */
314 314 return 0;
315 315 return get_initializer_size(expr->symbol->initializer);
316 316 }
317 317
318 318 static struct range_list *get_stored_size_bytes(struct expression *expr)
319 319 {
320 320 struct smatch_state *state;
321 321
322 322 state = get_state_expr(my_size_id, expr);
323 323 if (!state)
324 324 return NULL;
325 325 return estate_rl(state);
326 326 }
327 327
328 328 static int get_bytes_from_address(struct expression *expr)
329 329 {
330 330 struct symbol *type;
331 331 int ret;
332 332
333 333 if (!option_spammy)
334 334 return 0;
335 335 if (expr->type != EXPR_PREOP || expr->op != '&')
336 336 return 0;
337 337 type = get_type(expr);
338 338 if (!type)
339 339 return 0;
340 340
341 341 if (type->type == SYM_PTR)
342 342 type = get_base_type(type);
343 343
344 344 ret = type_bytes(type);
345 345 if (ret == 1)
346 346 return 0; /* ignore char pointers */
347 347
348 348 return ret;
349 349 }
350 350
351 351 static struct expression *remove_addr_fluff(struct expression *expr)
352 352 {
353 353 struct expression *tmp;
354 354 sval_t sval;
355 355
356 356 expr = strip_expr(expr);
357 357
358 358 /* remove '&' and '*' operations that cancel */
359 359 while (expr && expr->type == EXPR_PREOP && expr->op == '&') {
360 360 tmp = strip_expr(expr->unop);
361 361 if (tmp->type != EXPR_PREOP)
362 362 break;
363 363 if (tmp->op != '*')
364 364 break;
365 365 expr = strip_expr(tmp->unop);
366 366 }
367 367
368 368 if (!expr)
369 369 return NULL;
370 370
371 371 /* "foo + 0" is just "foo" */
372 372 if (expr->type == EXPR_BINOP && expr->op == '+' &&
373 373 get_value(expr->right, &sval) && sval.value == 0)
374 374 return expr->left;
375 375
376 376 return expr;
377 377 }
378 378
379 379 static int is_last_member_of_struct(struct symbol *sym, struct ident *member)
380 380 {
381 381 struct symbol *tmp;
382 382 int i;
383 383
384 384 i = 0;
385 385 FOR_EACH_PTR_REVERSE(sym->symbol_list, tmp) {
386 386 if (i++ || !tmp->ident)
387 387 return 0;
388 388 if (tmp->ident == member)
389 389 return 1;
390 390 return 0;
391 391 } END_FOR_EACH_PTR_REVERSE(tmp);
392 392
393 393 return 0;
394 394 }
395 395
396 396 int last_member_is_resizable(struct symbol *sym)
397 397 {
398 398 struct symbol *last_member;
399 399 struct symbol *type;
400 400 sval_t sval;
401 401
402 402 if (!sym || sym->type != SYM_STRUCT)
403 403 return 0;
404 404
405 405 last_member = last_ptr_list((struct ptr_list *)sym->symbol_list);
406 406 if (!last_member || !last_member->ident)
407 407 return 0;
408 408
409 409 type = get_real_base_type(last_member);
410 410 if (type->type == SYM_STRUCT)
411 411 return last_member_is_resizable(type);
412 412 if (type->type != SYM_ARRAY)
413 413 return 0;
414 414
415 415 if (!get_implied_value(type->array_size, &sval))
416 416 return 0;
417 417
418 418 if (sval.value != 0 && sval.value != 1)
419 419 return 0;
420 420
421 421 return 1;
422 422 }
423 423
424 424 static int get_stored_size_end_struct_bytes(struct expression *expr)
425 425 {
426 426 struct symbol *sym;
427 427 struct symbol *base_sym;
428 428 struct smatch_state *state;
429 429
430 430 if (expr->type == EXPR_BINOP) /* array elements foo[5] */
431 431 return 0;
432 432
433 433 if (expr->type == EXPR_PREOP && expr->op == '&')
434 434 expr = strip_parens(expr->unop);
435 435
436 436 sym = expr_to_sym(expr);
437 437 if (!sym || !sym->ident)
438 438 return 0;
439 439 if (!type_bytes(sym))
440 440 return 0;
441 441 if (sym->type != SYM_NODE)
442 442 return 0;
443 443
444 444 base_sym = get_real_base_type(sym);
445 445 if (!base_sym || base_sym->type != SYM_PTR)
446 446 return 0;
447 447 base_sym = get_real_base_type(base_sym);
448 448 if (!base_sym || base_sym->type != SYM_STRUCT)
449 449 return 0;
450 450
451 451 if (!is_last_member_of_struct(base_sym, expr->member))
452 452 return 0;
453 453 if (!last_member_is_resizable(base_sym))
454 454 return 0;
455 455
456 456 state = get_state(my_size_id, sym->ident->name, sym);
457 457 if (!estate_to_size(state))
458 458 return 0;
459 459
460 460 return estate_to_size(state) - type_bytes(base_sym) + type_bytes(get_type(expr));
461 461 }
462 462
463 463 static struct range_list *alloc_int_rl(int value)
464 464 {
465 465 sval_t sval = {
466 466 .type = &int_ctype,
467 467 {.value = value},
468 468 };
469 469
470 470 return alloc_rl(sval, sval);
471 471 }
472 472
473 473 struct range_list *get_array_size_bytes_rl(struct expression *expr)
474 474 {
475 475 struct range_list *ret = NULL;
476 476 int size;
477 477
478 478 expr = remove_addr_fluff(expr);
479 479 if (!expr)
480 480 return NULL;
481 481
482 482 /* "BAR" */
483 483 if (expr->type == EXPR_STRING)
484 484 return alloc_int_rl(expr->string->length);
485 485
486 486 if (expr->type == EXPR_BINOP && expr->op == '+') {
487 487 sval_t offset;
488 488 struct symbol *type;
489 489 int bytes;
490 490
491 491 if (!get_implied_value(expr->right, &offset))
492 492 return NULL;
493 493 type = get_type(expr->left);
494 494 if (!type)
495 495 return NULL;
496 496 if (type->type != SYM_ARRAY && type->type != SYM_PTR)
497 497 return NULL;
498 498 type = get_real_base_type(type);
499 499 bytes = type_bytes(type);
500 500 if (bytes == 0)
501 501 return NULL;
502 502 offset.value *= bytes;
503 503 size = get_array_size_bytes(expr->left);
504 504 if (size <= 0)
505 505 return NULL;
506 506 return alloc_int_rl(size - offset.value);
507 507 }
508 508
509 509 /* buf[4] */
510 510 size = get_real_array_size(expr);
511 511 if (size)
512 512 return alloc_int_rl(elements_to_bytes(expr, size));
513 513
514 514 /* buf = malloc(1024); */
515 515 ret = get_stored_size_bytes(expr);
516 516 if (ret)
517 517 return ret;
518 518
519 519 size = get_stored_size_end_struct_bytes(expr);
520 520 if (size)
521 521 return alloc_int_rl(size);
522 522
523 523 /* char *foo = "BAR" */
524 524 size = get_size_from_initializer(expr);
525 525 if (size)
526 526 return alloc_int_rl(elements_to_bytes(expr, size));
527 527
528 528 size = get_bytes_from_address(expr);
529 529 if (size)
530 530 return alloc_int_rl(size);
531 531
532 532 ret = size_from_db(expr);
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 set_state_expr(my_size_id, expr, alloc_estate_rl(rl));
638 638
639 639 type = get_type(expr);
640 640 if (!type)
641 641 return;
642 642 if (type->type != SYM_PTR)
643 643 return;
644 644 type = get_real_base_type(type);
645 645 if (!type)
646 646 return;
647 647 if (type == &void_ctype)
648 648 return;
649 649 if (type->type != SYM_BASETYPE && type->type != SYM_PTR)
650 650 return;
651 651
652 652 info_record_alloction(expr, rl);
653 653 }
654 654
655 655 static void match_array_assignment(struct expression *expr)
656 656 {
657 657 struct expression *left;
658 658 struct expression *right;
659 659 char *left_member, *right_member;
660 660 struct range_list *rl;
661 661 sval_t sval;
662 662
663 663 if (expr->op != '=')
664 664 return;
665 665 left = strip_expr(expr->left);
666 666 right = strip_expr(expr->right);
667 667 right = strip_ampersands(right);
668 668
669 669 if (!is_pointer(left))
670 670 return;
671 671 if (is_allocation_function(right))
672 672 return;
673 673
674 674 left_member = get_member_name(left);
675 675 right_member = get_member_name(right);
676 676 if (left_member && right_member && strcmp(left_member, right_member) == 0) {
677 677 free_string(left_member);
678 678 free_string(right_member);
679 679 return;
680 680 }
681 681 free_string(left_member);
682 682 free_string(right_member);
683 683
684 684 if (get_implied_value(right, &sval) && sval.value == 0) {
685 685 rl = alloc_int_rl(0);
686 686 goto store;
687 687 }
688 688
689 689 rl = get_array_size_bytes_rl(right);
690 690 if (!rl && __in_fake_assign)
691 691 return;
692 692
693 693 store:
694 694 store_alloc(left, rl);
695 695 }
696 696
697 697 static void match_alloc(const char *fn, struct expression *expr, void *_size_arg)
698 698 {
699 699 int size_arg = PTR_INT(_size_arg);
700 700 struct expression *right;
701 701 struct expression *arg;
702 702 struct range_list *rl;
703 703
704 704 right = strip_expr(expr->right);
705 705 arg = get_argument_from_call_expr(right->args, size_arg);
706 706 get_absolute_rl(arg, &rl);
707 707 rl = cast_rl(&int_ctype, rl);
708 708 store_alloc(expr->left, rl);
709 709 }
710 710
711 711 static void match_calloc(const char *fn, struct expression *expr, void *unused)
712 712 {
713 713 struct expression *right;
714 714 struct expression *arg;
715 715 sval_t elements;
716 716 sval_t size;
717 717
718 718 right = strip_expr(expr->right);
719 719 arg = get_argument_from_call_expr(right->args, 0);
720 720 if (!get_implied_value(arg, &elements))
721 721 return; // FIXME!!!
722 722 arg = get_argument_from_call_expr(right->args, 1);
723 723 if (get_implied_value(arg, &size))
724 724 store_alloc(expr->left, size_to_rl(elements.value * size.value));
725 725 else
726 726 store_alloc(expr->left, size_to_rl(-1));
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(-1));
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 if (sm->state == &merged ||
826 826 strcmp(sm->state->name, "(-1)") == 0 ||
827 827 strcmp(sm->state->name, "empty") == 0 ||
828 828 strcmp(sm->state->name, "0") == 0)
829 829 return;
830 830 sql_insert_caller_info(call, BUF_SIZE, param, printed_name, sm->state->name);
831 831 }
832 832
833 833 /*
834 834 * This is slightly (very) weird because half of this stuff is handled in
835 835 * smatch_parse_call_math.c which is poorly named. But anyway, add some buf
836 836 * sizes here.
837 837 *
838 838 */
839 839 static void print_returned_allocations(int return_id, char *return_ranges, struct expression *expr)
840 840 {
841 841 char buf[16];
842 842 int size;
843 843
844 844 size = get_array_size_bytes(expr);
845 845 if (!size)
846 846 return;
847 847
848 848 snprintf(buf, sizeof(buf), "%d", size);
849 849 sql_insert_return_states(return_id, return_ranges, BUF_SIZE, -1, "", buf);
850 850 }
851 851
852 852 static void record_global_size(struct symbol *sym)
853 853 {
854 854 int bytes;
855 855 char buf[16];
856 856
857 857 if (!sym->ident)
858 858 return;
859 859
860 860 if (!(sym->ctype.modifiers & MOD_TOPLEVEL) ||
861 861 sym->ctype.modifiers & MOD_STATIC)
862 862 return;
863 863
864 864 bytes = get_array_size_bytes(symbol_expression(sym));
865 865 if (bytes <= 1)
866 866 return;
867 867
868 868 snprintf(buf, sizeof(buf), "%d", bytes);
869 869 sql_insert_data_info_var_sym(sym->ident->name, sym, BUF_SIZE, buf);
870 870 }
871 871
872 872 void register_buf_size(int id)
873 873 {
874 874 my_size_id = id;
875 875
876 876 add_unmatched_state_hook(my_size_id, &unmatched_size_state);
877 877
878 878 select_caller_info_hook(set_param_buf_size, BUF_SIZE);
879 879 select_return_states_hook(BUF_SIZE, &db_returns_buf_size);
880 880 add_split_return_callback(print_returned_allocations);
881 881
882 882 allocation_funcs = create_function_hashtable(100);
883 883 add_allocation_function("malloc", &match_alloc, 0);
884 884 add_allocation_function("calloc", &match_calloc, 0);
885 885 add_allocation_function("memdup", &match_alloc, 1);
886 886 add_allocation_function("realloc", &match_alloc, 1);
887 887 if (option_project == PROJ_KERNEL) {
888 888 add_allocation_function("kmalloc", &match_alloc, 0);
889 889 add_allocation_function("kmalloc_node", &match_alloc, 0);
890 890 add_allocation_function("kzalloc", &match_alloc, 0);
891 891 add_allocation_function("kzalloc_node", &match_alloc, 0);
892 892 add_allocation_function("vmalloc", &match_alloc, 0);
893 893 add_allocation_function("__vmalloc", &match_alloc, 0);
894 894 add_allocation_function("kcalloc", &match_calloc, 0);
895 895 add_allocation_function("kmalloc_array", &match_calloc, 0);
896 896 add_allocation_function("drm_malloc_ab", &match_calloc, 0);
897 897 add_allocation_function("drm_calloc_large", &match_calloc, 0);
898 898 add_allocation_function("sock_kmalloc", &match_alloc, 1);
899 899 add_allocation_function("kmemdup", &match_alloc, 1);
900 900 add_allocation_function("kmemdup_user", &match_alloc, 1);
901 901 add_allocation_function("dma_alloc_attrs", &match_alloc, 1);
902 902 add_allocation_function("pci_alloc_consistent", &match_alloc, 1);
903 903 add_allocation_function("pci_alloc_coherent", &match_alloc, 1);
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904 904 add_allocation_function("devm_kmalloc", &match_alloc, 1);
905 905 add_allocation_function("devm_kzalloc", &match_alloc, 1);
906 906 add_allocation_function("krealloc", &match_alloc, 1);
907 907 add_allocation_function("__alloc_bootmem", &match_alloc, 0);
908 908 add_allocation_function("alloc_bootmem", &match_alloc, 0);
909 909 add_allocation_function("kmap", &match_page, 0);
910 910 add_allocation_function("get_zeroed_page", &match_page, 0);
911 911 add_allocation_function("alloc_pages", &match_alloc_pages, 1);
912 912 add_allocation_function("alloc_pages_current", &match_alloc_pages, 1);
913 913 add_allocation_function("__get_free_pages", &match_alloc_pages, 1);
914 + } else if (option_project == PROJ_ILLUMOS_USER) {
915 + add_allocation_function("libld_malloc", &match_alloc, 0);
916 + add_allocation_function("libld_realloc", &match_alloc, 1);
917 + add_allocation_function("libld_calloc", &match_calloc, 0);
914 918 }
915 919
916 920 add_allocation_function("strndup", match_strndup, 0);
917 921 if (option_project == PROJ_KERNEL)
918 922 add_allocation_function("kstrndup", match_strndup, 0);
919 923
920 924 add_modification_hook(my_size_id, &set_size_undefined);
921 925
922 926 add_merge_hook(my_size_id, &merge_size_func);
923 927
924 928 if (option_info)
925 929 add_hook(record_global_size, BASE_HOOK);
926 930 }
927 931
928 932 void register_buf_size_late(int id)
929 933 {
930 934 /* has to happen after match_alloc() */
931 935 add_hook(&match_array_assignment, ASSIGNMENT_HOOK);
932 936
933 937 add_hook(&match_call, FUNCTION_CALL_HOOK);
934 938 add_member_info_callback(my_size_id, struct_member_callback);
935 939 }
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