smatch_buf_size.c

   1 /*
   2  * Copyright (C) 2010 Dan Carpenter.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version 2
   7  * of the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, see http://www.gnu.org/copyleft/gpl.txt
  16  */
  17
  18 #include <stdlib.h>
  19 #include <errno.h>
  20 #include "parse.h"
  21 #include "smatch.h"
  22 #include "smatch_slist.h"
  23 #include "smatch_extra.h"
  24 #include "smatch_function_hashtable.h"
  25
  26 #define UNKNOWN_SIZE (-1)
  27
  28 static int my_size_id;
  29
  30 struct limiter {
  31         int buf_arg;
  32         int limit_arg;
  33 };
  34 static struct limiter b0_l2 = {0, 2};
  35
  36 static DEFINE_HASHTABLE_INSERT(insert_func, char, int);
  37 static DEFINE_HASHTABLE_SEARCH(search_func, char, int);
  38 static struct hashtable *allocation_funcs;
  39
  40 static char *get_fn_name(struct expression *expr)
  41 {
  42         if (expr->type != EXPR_CALL)
  43                 return NULL;
  44         if (expr->fn->type != EXPR_SYMBOL)
  45                 return NULL;
  46         return expr_to_var(expr->fn);
  47 }
  48
  49 static int is_allocation_function(struct expression *expr)
  50 {
  51         char *func;
  52         int ret = 0;
  53
  54         func = get_fn_name(expr);
  55         if (!func)
  56                 return 0;
  57         if (search_func(allocation_funcs, func))
  58                 ret = 1;
  59         free_string(func);
  60         return ret;
  61 }
  62
  63 static void add_allocation_function(const char *func, void *call_back, int param)
  64 {
  65         insert_func(allocation_funcs, (char *)func, (int *)1);
  66         add_function_assign_hook(func, call_back, INT_PTR(param));
  67 }
  68
  69 static int estate_to_size(struct smatch_state *state)
  70 {
  71         sval_t sval;
  72
  73         if (!state || !estate_rl(state))
  74                 return 0;
  75         sval = estate_max(state);
  76         return sval.value;
  77 }
  78
  79 static struct smatch_state *size_to_estate(int size)
  80 {
  81         sval_t sval;
  82
  83         sval.type = &int_ctype;
  84         sval.value = size;
  85
  86         return alloc_estate_sval(sval);
  87 }
  88
  89 static struct range_list *size_to_rl(int size)
  90 {
  91         sval_t sval;
  92
  93         sval.type = &int_ctype;
  94         sval.value = size;
  95
  96         return alloc_rl(sval, sval);
  97 }
  98
  99 static struct smatch_state *unmatched_size_state(struct sm_state *sm)
 100 {
 101         return size_to_estate(UNKNOWN_SIZE);
 102 }
 103
 104 static void set_size_undefined(struct sm_state *sm, struct expression *mod_expr)
 105 {
 106         set_state(sm->owner, sm->name, sm->sym, size_to_estate(UNKNOWN_SIZE));
 107 }
 108
 109 static struct smatch_state *merge_size_func(struct smatch_state *s1, struct smatch_state *s2)
 110 {
 111         return merge_estates(s1, s2);
 112 }
 113
 114 void set_param_buf_size(const char *name, struct symbol *sym, char *key, char *value)
 115 {
 116         struct range_list *rl = NULL;
 117         struct smatch_state *state;
 118         char fullname[256];
 119
 120         if (strncmp(key, "$$", 2) != 0)
 121                 return;
 122
 123         snprintf(fullname, 256, "%s%s", name, key + 2);
 124
 125         str_to_rl(&int_ctype, value, &rl);
 126         if (!rl || is_whole_rl(rl))
 127                 return;
 128         state = alloc_estate_rl(rl);
 129         set_state(my_size_id, fullname, sym, state);
 130 }
 131
 132 static int bytes_per_element(struct expression *expr)
 133 {
 134         struct symbol *type;
 135
 136         if (expr->type == EXPR_STRING)
 137                 return 1;
 138         type = get_type(expr);
 139         if (!type)
 140                 return 0;
 141
 142         if (type->type != SYM_PTR && type->type != SYM_ARRAY)
 143                 return 0;
 144
 145         type = get_base_type(type);
 146         return type_bytes(type);
 147 }
 148
 149 static int bytes_to_elements(struct expression *expr, int bytes)
 150 {
 151         int bpe;
 152
 153         bpe = bytes_per_element(expr);
 154         if (bpe == 0)
 155                 return 0;
 156         return bytes / bpe;
 157 }
 158
 159 static int elements_to_bytes(struct expression *expr, int elements)
 160 {
 161         int bpe;
 162
 163         bpe = bytes_per_element(expr);
 164         return elements * bpe;
 165 }
 166
 167 static int get_initializer_size(struct expression *expr)
 168 {
 169         switch (expr->type) {
 170         case EXPR_STRING:
 171                 return expr->string->length;
 172         case EXPR_INITIALIZER: {
 173                 struct expression *tmp;
 174                 int i = 0;
 175
 176                 FOR_EACH_PTR(expr->expr_list, tmp) {
 177                         if (tmp->type == EXPR_INDEX) {
 178                                 if (tmp->idx_to >= i)
 179                                         i = tmp->idx_to;
 180                                 else
 181                                         continue;
 182                         }
 183
 184                         i++;
 185                 } END_FOR_EACH_PTR(tmp);
 186                 return i;
 187         }
 188         case EXPR_SYMBOL:
 189                 return get_array_size(expr);
 190         }
 191         return 0;
 192 }
 193
 194 static struct range_list *db_size_rl;
 195 static int db_size_callback(void *unused, int argc, char **argv, char **azColName)
 196 {
 197         struct range_list *tmp = NULL;
 198
 199         if (!db_size_rl) {
 200                 str_to_rl(&int_ctype, argv[0], &db_size_rl);
 201         } else {
 202                 str_to_rl(&int_ctype, argv[0], &tmp);
 203                 db_size_rl = rl_union(db_size_rl, tmp);
 204         }
 205         return 0;
 206 }
 207
 208 static struct range_list *size_from_db(struct expression *expr)
 209 {
 210         int this_file_only = 0;
 211         char *name;
 212
 213         name = get_member_name(expr);
 214         if (!name && is_static(expr)) {
 215                 name = expr_to_var(expr);
 216                 this_file_only = 1;
 217         }
 218         if (!name)
 219                 return 0;
 220
 221         if (this_file_only) {
 222                 db_size_rl = NULL;
 223                 run_sql(db_size_callback, "select size from function_type_size where type = '%s' and file = '%s';",
 224                                 name, get_filename());
 225                 if (db_size_rl)
 226                         return db_size_rl;
 227                 return 0;
 228         }
 229
 230         db_size_rl = NULL;
 231         run_sql(db_size_callback, "select size from type_size where type = '%s';",
 232                         name);
 233         return db_size_rl;
 234 }
 235
 236 static void db_returns_buf_size(struct expression *expr, int param, char *unused, char *math)
 237 {
 238         struct expression *call;
 239         sval_t sval;
 240
 241         if (expr->type != EXPR_ASSIGNMENT)
 242                 return;
 243         call = strip_expr(expr->right);
 244
 245         if (!parse_call_math(call, math, &sval))
 246                 return;
 247         set_state_expr(my_size_id, expr->left, size_to_estate(sval.value));
 248 }
 249
 250 int get_real_array_size(struct expression *expr)
 251 {
 252         struct symbol *type;
 253         sval_t sval;
 254
 255         if (expr->type == EXPR_BINOP) /* array elements foo[5] */
 256                 return 0;
 257
 258         type = get_type(expr);
 259         if (!type)
 260                 return 0;
 261         if (!type || type->type != SYM_ARRAY)
 262                 return 0;
 263
 264         if (!get_implied_value(type->array_size, &sval))
 265                 return 0;
 266
 267         /* People put one element arrays on the end of structs */
 268         if (sval.value == 1)
 269                 return 0;
 270
 271         return sval.value;
 272 }
 273
 274 static int get_size_from_initializer(struct expression *expr)
 275 {
 276         if (expr->type != EXPR_SYMBOL || !expr->symbol || !expr->symbol->initializer)
 277                 return 0;
 278         if (expr->symbol->initializer == expr) /* int a = a; */
 279                 return 0;
 280         return get_initializer_size(expr->symbol->initializer);
 281 }
 282
 283 static struct range_list *get_stored_size_bytes(struct expression *expr)
 284 {
 285         struct smatch_state *state;
 286
 287         state = get_state_expr(my_size_id, expr);
 288         if (!state)
 289                 return NULL;
 290         return estate_rl(state);
 291 }
 292
 293 static int get_bytes_from_address(struct expression *expr)
 294 {
 295         struct symbol *type;
 296         int ret;
 297
 298         if (!option_spammy)
 299                 return 0;
 300         if (expr->type != EXPR_PREOP || expr->op != '&')
 301                 return 0;
 302         type = get_type(expr);
 303         if (!type)
 304                 return 0;
 305
 306         if (type->type == SYM_PTR)
 307                 type = get_base_type(type);
 308
 309         ret = type_bytes(type);
 310         if (ret == 1)
 311                 return 0;  /* ignore char pointers */
 312
 313         return ret;
 314 }
 315
 316 static struct expression *remove_addr_fluff(struct expression *expr)
 317 {
 318         struct expression *tmp;
 319         sval_t sval;
 320
 321         expr = strip_expr(expr);
 322
 323         /* remove '&' and '*' operations that cancel */
 324         while (expr && expr->type == EXPR_PREOP && expr->op == '&') {
 325                 tmp = strip_expr(expr->unop);
 326                 if (tmp->type != EXPR_PREOP)
 327                         break;
 328                 if (tmp->op != '*')
 329                         break;
 330                 expr = strip_expr(tmp->unop);
 331         }
 332
 333         if (!expr)
 334                 return NULL;
 335
 336         /* "foo + 0" is just "foo" */
 337         if (expr->type == EXPR_BINOP && expr->op == '+' &&
 338             get_value(expr->right, &sval) && sval.value == 0)
 339                 return expr->left;
 340
 341         return expr;
 342 }
 343
 344 static int is_last_member_of_struct(struct symbol *sym, struct ident *member)
 345 {
 346         struct symbol *tmp;
 347         int i;
 348
 349         i = 0;
 350         FOR_EACH_PTR_REVERSE(sym->symbol_list, tmp) {
 351                 if (i++ || !tmp->ident)
 352                         return 0;
 353                 if (tmp->ident == member)
 354                         return 1;
 355                 return 0;
 356         } END_FOR_EACH_PTR_REVERSE(tmp);
 357
 358         return 0;
 359 }
 360
 361 static int get_stored_size_end_struct_bytes(struct expression *expr)
 362 {
 363         struct symbol *type;
 364         char *name;
 365         struct symbol *sym;
 366         struct smatch_state *state;
 367         sval_t sval;
 368
 369         if (expr->type == EXPR_BINOP) /* array elements foo[5] */
 370                 return 0;
 371
 372         type = get_type(expr);
 373         if (!type || type->type != SYM_ARRAY)
 374                 return 0;
 375
 376         if (!get_implied_value(type->array_size, &sval))
 377                 return 0;
 378
 379         if (sval.value != 0 && sval.value != 1)
 380                 return 0;
 381
 382         name = expr_to_var_sym(expr, &sym);
 383         free_string(name);
 384         if (!sym || !sym->ident)
 385                 return 0;
 386         if (!type_bytes(sym))
 387                 return 0;
 388
 389         if (sym->type != SYM_NODE)
 390                 return 0;
 391
 392         state = get_state(my_size_id, sym->ident->name, sym);
 393         if (!estate_to_size(state))
 394                 return 0;
 395
 396         sym = get_real_base_type(sym);
 397         if (!sym || sym->type != SYM_PTR)
 398                 return 0;
 399         sym = get_real_base_type(sym);
 400         if (!sym || sym->type != SYM_STRUCT)
 401                 return 0;
 402         if (!is_last_member_of_struct(sym, expr->member))
 403                 return 0;
 404
 405         return estate_to_size(state) - type_bytes(sym) + type_bytes(type);
 406 }
 407
 408 static struct range_list *alloc_int_rl(int value)
 409 {
 410         sval_t sval = {
 411                 .type = &int_ctype,
 412                 {.value = value},
 413         };
 414
 415         return alloc_rl(sval, sval);
 416 }
 417
 418 struct range_list *get_array_size_bytes_rl(struct expression *expr)
 419 {
 420         int declared_size = 0;
 421         struct range_list *ret = NULL;
 422         int size;
 423
 424         expr = remove_addr_fluff(expr);
 425         if (!expr)
 426                 return NULL;
 427
 428         /* "BAR" */
 429         if (expr->type == EXPR_STRING)
 430                 return alloc_int_rl(expr->string->length);
 431
 432         /* buf[4] */
 433         size = get_real_array_size(expr);
 434         if (size)
 435                 declared_size = elements_to_bytes(expr, size);
 436
 437         /* buf = malloc(1024); */
 438         ret = get_stored_size_bytes(expr);
 439         if (ret) {
 440                 if (declared_size)
 441                         return rl_union(ret, alloc_int_rl(size));
 442                 return ret;
 443         }
 444         if (declared_size)
 445                 return alloc_int_rl(declared_size);
 446
 447         size = get_stored_size_end_struct_bytes(expr);
 448         if (size)
 449                 return alloc_int_rl(size);
 450
 451         /* char *foo = "BAR" */
 452         size = get_size_from_initializer(expr);
 453         if (size)
 454                 return alloc_int_rl(elements_to_bytes(expr, size));
 455
 456         size = get_bytes_from_address(expr);
 457         if (size)
 458                 return alloc_int_rl(size);
 459
 460         /* if (strlen(foo) > 4) */
 461         size = get_size_from_strlen(expr);
 462         if (size)
 463                 return alloc_int_rl(size);
 464
 465         ret = size_from_db(expr);
 466         if (ret)
 467                 return ret;
 468
 469         return NULL;
 470 }
 471
 472 int get_array_size_bytes(struct expression *expr)
 473 {
 474         struct range_list *rl;
 475         sval_t sval;
 476
 477         rl = get_array_size_bytes_rl(expr);
 478         if (!rl_to_sval(rl, &sval))
 479                 return 0;
 480         if (sval.uvalue >= INT_MAX)
 481                 return 0;
 482         return sval.value;
 483 }
 484
 485 int get_array_size_bytes_max(struct expression *expr)
 486 {
 487         struct range_list *rl;
 488         sval_t bytes;
 489
 490         rl = get_array_size_bytes_rl(expr);
 491         if (!rl)
 492                 return 0;
 493         bytes = rl_min(rl);
 494         if (bytes.value < 0)
 495                 return 0;
 496         bytes = rl_max(rl);
 497         if (bytes.uvalue >= INT_MAX)
 498                 return 0;
 499         return bytes.value;
 500 }
 501
 502 int get_array_size_bytes_min(struct expression *expr)
 503 {
 504         struct range_list *rl;
 505         struct data_range *range;
 506
 507         rl = get_array_size_bytes_rl(expr);
 508         if (!rl)
 509                 return 0;
 510
 511         FOR_EACH_PTR(rl, range) {
 512                 if (range->min.value <= 0)
 513                         return 0;
 514                 if (range->max.value <= 0)
 515                         return 0;
 516                 if (range->min.uvalue >= INT_MAX)
 517                         return 0;
 518                 return range->min.value;
 519         } END_FOR_EACH_PTR(range);
 520
 521         return 0;
 522 }
 523
 524 int get_array_size(struct expression *expr)
 525 {
 526         return bytes_to_elements(expr, get_array_size_bytes_max(expr));
 527 }
 528
 529 static void match_strlen_condition(struct expression *expr)
 530 {
 531         struct expression *left;
 532         struct expression *right;
 533         struct expression *str = NULL;
 534         int strlen_left = 0;
 535         int strlen_right = 0;
 536         sval_t sval;
 537         struct smatch_state *true_state = NULL;
 538         struct smatch_state *false_state = NULL;
 539
 540         if (expr->type != EXPR_COMPARE)
 541                 return;
 542         left = strip_expr(expr->left);
 543         right = strip_expr(expr->right);
 544
 545         if (left->type == EXPR_CALL && sym_name_is("strlen", left->fn)) {
 546                 str = get_argument_from_call_expr(left->args, 0);
 547                 strlen_left = 1;
 548         }
 549         if (right->type == EXPR_CALL && sym_name_is("strlen", right->fn)) {
 550                 str = get_argument_from_call_expr(right->args, 0);
 551                 strlen_right = 1;
 552         }
 553
 554         if (!strlen_left && !strlen_right)
 555                 return;
 556         if (strlen_left && strlen_right)
 557                 return;
 558
 559         if (strlen_left) {
 560                 if (!get_value(right, &sval))
 561                         return;
 562         }
 563         if (strlen_right) {
 564                 if (!get_value(left, &sval))
 565                         return;
 566         }
 567
 568         /* FIXME:  why are we using my_size_id here instead of my_strlen_id */
 569
 570         if (expr->op == SPECIAL_EQUAL) {
 571                 set_true_false_states_expr(my_size_id, str, size_to_estate(sval.value + 1), NULL);
 572                 return;
 573         }
 574         if (expr->op == SPECIAL_NOTEQUAL) {
 575                 set_true_false_states_expr(my_size_id, str, NULL, size_to_estate(sval.value + 1));
 576                 return;
 577         }
 578
 579         switch (expr->op) {
 580         case '<':
 581         case SPECIAL_UNSIGNED_LT:
 582                 if (strlen_left)
 583                         true_state = size_to_estate(sval.value);
 584                 else
 585                         false_state = size_to_estate(sval.value + 1);
 586                 break;
 587         case SPECIAL_LTE:
 588         case SPECIAL_UNSIGNED_LTE:
 589                 if (strlen_left)
 590                         true_state = size_to_estate(sval.value + 1);
 591                 else
 592                         false_state = size_to_estate(sval.value);
 593                 break;
 594         case SPECIAL_GTE:
 595         case SPECIAL_UNSIGNED_GTE:
 596                 if (strlen_left)
 597                         false_state = size_to_estate(sval.value);
 598                 else
 599                         true_state = size_to_estate(sval.value + 1);
 600                 break;
 601         case '>':
 602         case SPECIAL_UNSIGNED_GT:
 603                 if (strlen_left)
 604                         false_state = size_to_estate(sval.value + 1);
 605                 else
 606                         true_state = size_to_estate(sval.value);
 607                 break;
 608         }
 609         set_true_false_states_expr(my_size_id, str, true_state, false_state);
 610 }
 611
 612 static struct expression *strip_ampersands(struct expression *expr)
 613 {
 614         struct symbol *type;
 615
 616         if (expr->type != EXPR_PREOP)
 617                 return expr;
 618         if (expr->op != '&')
 619                 return expr;
 620         type = get_type(expr->unop);
 621         if (!type || type->type != SYM_ARRAY)
 622                 return expr;
 623         return expr->unop;
 624 }
 625
 626 static void info_record_alloction(struct expression *buffer, struct range_list *rl)
 627 {
 628         char *name;
 629
 630         if (!option_info)
 631                 return;
 632
 633         name = get_member_name(buffer);
 634         if (!name && is_static(buffer))
 635                 name = expr_to_var(buffer);
 636         if (!name)
 637                 return;
 638         if (rl && !is_whole_rl(rl))
 639                 sql_insert_function_type_size(name, show_rl(rl));
 640         else
 641                 sql_insert_function_type_size(name, "(-1)");
 642
 643         free_string(name);
 644 }
 645
 646 static void store_alloc(struct expression *expr, struct range_list *rl)
 647 {
 648         rl = clone_rl(rl); // FIXME!!!
 649         info_record_alloction(expr, rl);
 650         set_state_expr(my_size_id, expr, alloc_estate_rl(rl));
 651 }
 652
 653 static void match_array_assignment(struct expression *expr)
 654 {
 655         struct expression *left;
 656         struct expression *right;
 657         struct range_list *rl;
 658         sval_t sval;
 659
 660         if (expr->op != '=')
 661                 return;
 662         left = strip_expr(expr->left);
 663         right = strip_expr(expr->right);
 664         right = strip_ampersands(right);
 665
 666         if (is_allocation_function(right))
 667                 return;
 668
 669         if (get_implied_value(right, &sval) && sval.value == 0) {
 670                 rl = alloc_int_rl(0);
 671                 goto store;
 672         }
 673
 674         rl = get_array_size_bytes_rl(right);
 675
 676 store:
 677         store_alloc(left, rl);
 678 }
 679
 680 static void match_alloc(const char *fn, struct expression *expr, void *_size_arg)
 681 {
 682         int size_arg = PTR_INT(_size_arg);
 683         struct expression *right;
 684         struct expression *arg;
 685         struct range_list *rl;
 686
 687         right = strip_expr(expr->right);
 688         arg = get_argument_from_call_expr(right->args, size_arg);
 689         get_absolute_rl(arg, &rl);
 690         rl = cast_rl(&int_ctype, rl);
 691         store_alloc(expr->left, rl);
 692 }
 693
 694 static void match_calloc(const char *fn, struct expression *expr, void *unused)
 695 {
 696         struct expression *right;
 697         struct expression *arg;
 698         sval_t elements;
 699         sval_t size;
 700
 701         right = strip_expr(expr->right);
 702         arg = get_argument_from_call_expr(right->args, 0);
 703         if (!get_implied_value(arg, &elements))
 704                 return; // FIXME!!!
 705         arg = get_argument_from_call_expr(right->args, 1);
 706         if (get_implied_value(arg, &size))
 707                 store_alloc(expr->left, size_to_rl(elements.value * size.value));
 708         else
 709                 store_alloc(expr->left, size_to_rl(-1));
 710 }
 711
 712 static void match_limited(const char *fn, struct expression *expr, void *_limiter)
 713 {
 714         struct limiter *limiter = (struct limiter *)_limiter;
 715         struct expression *dest;
 716         struct expression *size_expr;
 717         sval_t size;
 718
 719         dest = get_argument_from_call_expr(expr->args, limiter->buf_arg);
 720         size_expr = get_argument_from_call_expr(expr->args, limiter->limit_arg);
 721         if (!get_implied_max(size_expr, &size))
 722                 return;
 723         set_state_expr(my_size_id, dest, size_to_estate(size.value));
 724 }
 725
 726 static void match_strcpy(const char *fn, struct expression *expr, void *unused)
 727 {
 728         struct expression fake_assign;
 729
 730         fake_assign.op = '=';
 731         fake_assign.left = get_argument_from_call_expr(expr->args, 0);
 732         fake_assign.right = get_argument_from_call_expr(expr->args, 1);
 733         match_array_assignment(&fake_assign);
 734 }
 735
 736 static void match_strndup(const char *fn, struct expression *expr, void *unused)
 737 {
 738         struct expression *fn_expr;
 739         struct expression *size_expr;
 740         sval_t size;
 741
 742         fn_expr = strip_expr(expr->right);
 743         size_expr = get_argument_from_call_expr(fn_expr->args, 1);
 744         if (get_implied_max(size_expr, &size)) {
 745                 size.value++;
 746                 store_alloc(expr->left, size_to_rl(size.value));
 747         } else {
 748                 store_alloc(expr->left, size_to_rl(-1));
 749         }
 750
 751 }
 752
 753 static void match_call(struct expression *expr)
 754 {
 755         struct expression *arg;
 756         struct range_list *rl;
 757         int i;
 758
 759         i = 0;
 760         FOR_EACH_PTR(expr->args, arg) {
 761                 rl = get_array_size_bytes_rl(arg);
 762                 if (rl && !is_whole_rl(rl))
 763                         sql_insert_caller_info(expr, BUF_SIZE, i, "$$", show_rl(rl));
 764                 i++;
 765         } END_FOR_EACH_PTR(arg);
 766 }
 767
 768 static void struct_member_callback(struct expression *call, int param, char *printed_name, struct smatch_state *state)
 769 {
 770         if (state == &merged)
 771                 return;
 772         sql_insert_caller_info(call, BUF_SIZE, param, printed_name, state->name);
 773 }
 774
 775 void register_buf_size(int id)
 776 {
 777         my_size_id = id;
 778
 779         add_unmatched_state_hook(my_size_id, &unmatched_size_state);
 780
 781         select_caller_info_hook(set_param_buf_size, BUF_SIZE);
 782         select_return_states_hook(BUF_SIZE, &db_returns_buf_size);
 783
 784         allocation_funcs = create_function_hashtable(100);
 785         add_allocation_function("malloc", &match_alloc, 0);
 786         add_allocation_function("calloc", &match_calloc, 0);
 787         add_allocation_function("memdup", &match_alloc, 1);
 788         if (option_project == PROJ_KERNEL) {
 789                 add_allocation_function("kmalloc", &match_alloc, 0);
 790                 add_allocation_function("kzalloc", &match_alloc, 0);
 791                 add_allocation_function("vmalloc", &match_alloc, 0);
 792                 add_allocation_function("__vmalloc", &match_alloc, 0);
 793                 add_allocation_function("kcalloc", &match_calloc, 0);
 794                 add_allocation_function("kmalloc_array", &match_calloc, 0);
 795                 add_allocation_function("drm_malloc_ab", &match_calloc, 0);
 796                 add_allocation_function("drm_calloc_large", &match_calloc, 0);
 797                 add_allocation_function("sock_kmalloc", &match_alloc, 1);
 798                 add_allocation_function("kmemdup", &match_alloc, 1);
 799                 add_allocation_function("kmemdup_user", &match_alloc, 1);
 800                 add_allocation_function("dma_alloc_attrs", &match_alloc, 1);
 801                 add_allocation_function("pci_alloc_consistent", &match_alloc, 1);
 802                 add_allocation_function("pci_alloc_coherent", &match_alloc, 1);
 803                 add_allocation_function("devm_kmalloc", &match_alloc, 1);
 804                 add_allocation_function("devm_kzalloc", &match_alloc, 1);
 805         }
 806         add_hook(&match_strlen_condition, CONDITION_HOOK);
 807
 808         add_allocation_function("strndup", match_strndup, 0);
 809         if (option_project == PROJ_KERNEL)
 810                 add_allocation_function("kstrndup", match_strndup, 0);
 811
 812         add_modification_hook(my_size_id, &set_size_undefined);
 813
 814         add_merge_hook(my_size_id, &merge_size_func);
 815 }
 816
 817 void register_buf_size_late(int id)
 818 {
 819         /* has to happen after match_alloc() */
 820         add_hook(&match_array_assignment, ASSIGNMENT_HOOK);
 821
 822         add_function_hook("strlcpy", &match_limited, &b0_l2);
 823         add_function_hook("strlcat", &match_limited, &b0_l2);
 824         add_function_hook("memscan", &match_limited, &b0_l2);
 825
 826         add_function_hook("strcpy", &match_strcpy, NULL);
 827
 828         add_hook(&match_call, FUNCTION_CALL_HOOK);
 829         add_member_info_callback(my_size_id, struct_member_callback);
 830 }