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, NULL,
 224                         "select size from function_type_size where type = '%s' and file = '%s';",
 225                         name, get_filename());
 226                 if (db_size_rl)
 227                         return db_size_rl;
 228                 return 0;
 229         }
 230
 231         db_size_rl = NULL;
 232         run_sql(db_size_callback, NULL,
 233                 "select size from type_size where type = '%s';",
 234                 name);
 235         return db_size_rl;
 236 }
 237
 238 static void db_returns_buf_size(struct expression *expr, int param, char *unused, char *math)
 239 {
 240         struct expression *call;
 241         sval_t sval;
 242
 243         if (expr->type != EXPR_ASSIGNMENT)
 244                 return;
 245         call = strip_expr(expr->right);
 246
 247         if (!parse_call_math(call, math, &sval))
 248                 return;
 249         set_state_expr(my_size_id, expr->left, size_to_estate(sval.value));
 250 }
 251
 252 int get_real_array_size(struct expression *expr)
 253 {
 254         struct symbol *type;
 255         sval_t sval;
 256
 257         if (expr->type == EXPR_BINOP) /* array elements foo[5] */
 258                 return 0;
 259
 260         type = get_type(expr);
 261         if (!type)
 262                 return 0;
 263         if (!type || type->type != SYM_ARRAY)
 264                 return 0;
 265
 266         if (!get_implied_value(type->array_size, &sval))
 267                 return 0;
 268
 269         /* People put one element arrays on the end of structs */
 270         if (sval.value == 1)
 271                 return 0;
 272
 273         return sval.value;
 274 }
 275
 276 static int get_size_from_initializer(struct expression *expr)
 277 {
 278         if (expr->type != EXPR_SYMBOL || !expr->symbol || !expr->symbol->initializer)
 279                 return 0;
 280         if (expr->symbol->initializer == expr) /* int a = a; */
 281                 return 0;
 282         return get_initializer_size(expr->symbol->initializer);
 283 }
 284
 285 static struct range_list *get_stored_size_bytes(struct expression *expr)
 286 {
 287         struct smatch_state *state;
 288
 289         state = get_state_expr(my_size_id, expr);
 290         if (!state)
 291                 return NULL;
 292         return estate_rl(state);
 293 }
 294
 295 static int get_bytes_from_address(struct expression *expr)
 296 {
 297         struct symbol *type;
 298         int ret;
 299
 300         if (!option_spammy)
 301                 return 0;
 302         if (expr->type != EXPR_PREOP || expr->op != '&')
 303                 return 0;
 304         type = get_type(expr);
 305         if (!type)
 306                 return 0;
 307
 308         if (type->type == SYM_PTR)
 309                 type = get_base_type(type);
 310
 311         ret = type_bytes(type);
 312         if (ret == 1)
 313                 return 0;  /* ignore char pointers */
 314
 315         return ret;
 316 }
 317
 318 static struct expression *remove_addr_fluff(struct expression *expr)
 319 {
 320         struct expression *tmp;
 321         sval_t sval;
 322
 323         expr = strip_expr(expr);
 324
 325         /* remove '&' and '*' operations that cancel */
 326         while (expr && expr->type == EXPR_PREOP && expr->op == '&') {
 327                 tmp = strip_expr(expr->unop);
 328                 if (tmp->type != EXPR_PREOP)
 329                         break;
 330                 if (tmp->op != '*')
 331                         break;
 332                 expr = strip_expr(tmp->unop);
 333         }
 334
 335         if (!expr)
 336                 return NULL;
 337
 338         /* "foo + 0" is just "foo" */
 339         if (expr->type == EXPR_BINOP && expr->op == '+' &&
 340             get_value(expr->right, &sval) && sval.value == 0)
 341                 return expr->left;
 342
 343         return expr;
 344 }
 345
 346 static int is_last_member_of_struct(struct symbol *sym, struct ident *member)
 347 {
 348         struct symbol *tmp;
 349         int i;
 350
 351         i = 0;
 352         FOR_EACH_PTR_REVERSE(sym->symbol_list, tmp) {
 353                 if (i++ || !tmp->ident)
 354                         return 0;
 355                 if (tmp->ident == member)
 356                         return 1;
 357                 return 0;
 358         } END_FOR_EACH_PTR_REVERSE(tmp);
 359
 360         return 0;
 361 }
 362
 363 static int get_stored_size_end_struct_bytes(struct expression *expr)
 364 {
 365         struct symbol *type;
 366         char *name;
 367         struct symbol *sym;
 368         struct smatch_state *state;
 369         sval_t sval;
 370
 371         if (expr->type == EXPR_BINOP) /* array elements foo[5] */
 372                 return 0;
 373
 374         type = get_type(expr);
 375         if (!type || type->type != SYM_ARRAY)
 376                 return 0;
 377
 378         if (!get_implied_value(type->array_size, &sval))
 379                 return 0;
 380
 381         if (sval.value != 0 && sval.value != 1)
 382                 return 0;
 383
 384         name = expr_to_var_sym(expr, &sym);
 385         free_string(name);
 386         if (!sym || !sym->ident)
 387                 return 0;
 388         if (!type_bytes(sym))
 389                 return 0;
 390
 391         if (sym->type != SYM_NODE)
 392                 return 0;
 393
 394         state = get_state(my_size_id, sym->ident->name, sym);
 395         if (!estate_to_size(state))
 396                 return 0;
 397
 398         sym = get_real_base_type(sym);
 399         if (!sym || sym->type != SYM_PTR)
 400                 return 0;
 401         sym = get_real_base_type(sym);
 402         if (!sym || sym->type != SYM_STRUCT)
 403                 return 0;
 404         if (!is_last_member_of_struct(sym, expr->member))
 405                 return 0;
 406
 407         return estate_to_size(state) - type_bytes(sym) + type_bytes(type);
 408 }
 409
 410 static struct range_list *alloc_int_rl(int value)
 411 {
 412         sval_t sval = {
 413                 .type = &int_ctype,
 414                 {.value = value},
 415         };
 416
 417         return alloc_rl(sval, sval);
 418 }
 419
 420 struct range_list *get_array_size_bytes_rl(struct expression *expr)
 421 {
 422         int declared_size = 0;
 423         struct range_list *ret = NULL;
 424         int size;
 425
 426         expr = remove_addr_fluff(expr);
 427         if (!expr)
 428                 return NULL;
 429
 430         /* "BAR" */
 431         if (expr->type == EXPR_STRING)
 432                 return alloc_int_rl(expr->string->length);
 433
 434         /* buf[4] */
 435         size = get_real_array_size(expr);
 436         if (size)
 437                 declared_size = elements_to_bytes(expr, size);
 438
 439         /* buf = malloc(1024); */
 440         ret = get_stored_size_bytes(expr);
 441         if (ret) {
 442                 if (declared_size)
 443                         return rl_union(ret, alloc_int_rl(size));
 444                 return ret;
 445         }
 446         if (declared_size)
 447                 return alloc_int_rl(declared_size);
 448
 449         size = get_stored_size_end_struct_bytes(expr);
 450         if (size)
 451                 return alloc_int_rl(size);
 452
 453         /* char *foo = "BAR" */
 454         size = get_size_from_initializer(expr);
 455         if (size)
 456                 return alloc_int_rl(elements_to_bytes(expr, size));
 457
 458         size = get_bytes_from_address(expr);
 459         if (size)
 460                 return alloc_int_rl(size);
 461
 462         /* if (strlen(foo) > 4) */
 463         size = get_size_from_strlen(expr);
 464         if (size)
 465                 return alloc_int_rl(size);
 466
 467         ret = size_from_db(expr);
 468         if (ret)
 469                 return ret;
 470
 471         return NULL;
 472 }
 473
 474 int get_array_size_bytes(struct expression *expr)
 475 {
 476         struct range_list *rl;
 477         sval_t sval;
 478
 479         rl = get_array_size_bytes_rl(expr);
 480         if (!rl_to_sval(rl, &sval))
 481                 return 0;
 482         if (sval.uvalue >= INT_MAX)
 483                 return 0;
 484         return sval.value;
 485 }
 486
 487 int get_array_size_bytes_max(struct expression *expr)
 488 {
 489         struct range_list *rl;
 490         sval_t bytes;
 491
 492         rl = get_array_size_bytes_rl(expr);
 493         if (!rl)
 494                 return 0;
 495         bytes = rl_min(rl);
 496         if (bytes.value < 0)
 497                 return 0;
 498         bytes = rl_max(rl);
 499         if (bytes.uvalue >= INT_MAX)
 500                 return 0;
 501         return bytes.value;
 502 }
 503
 504 int get_array_size_bytes_min(struct expression *expr)
 505 {
 506         struct range_list *rl;
 507         struct data_range *range;
 508
 509         rl = get_array_size_bytes_rl(expr);
 510         if (!rl)
 511                 return 0;
 512
 513         FOR_EACH_PTR(rl, range) {
 514                 if (range->min.value <= 0)
 515                         return 0;
 516                 if (range->max.value <= 0)
 517                         return 0;
 518                 if (range->min.uvalue >= INT_MAX)
 519                         return 0;
 520                 return range->min.value;
 521         } END_FOR_EACH_PTR(range);
 522
 523         return 0;
 524 }
 525
 526 int get_array_size(struct expression *expr)
 527 {
 528         return bytes_to_elements(expr, get_array_size_bytes_max(expr));
 529 }
 530
 531 static void match_strlen_condition(struct expression *expr)
 532 {
 533         struct expression *left;
 534         struct expression *right;
 535         struct expression *str = NULL;
 536         int strlen_left = 0;
 537         int strlen_right = 0;
 538         sval_t sval;
 539         struct smatch_state *true_state = NULL;
 540         struct smatch_state *false_state = NULL;
 541
 542         if (expr->type != EXPR_COMPARE)
 543                 return;
 544         left = strip_expr(expr->left);
 545         right = strip_expr(expr->right);
 546
 547         if (left->type == EXPR_CALL && sym_name_is("strlen", left->fn)) {
 548                 str = get_argument_from_call_expr(left->args, 0);
 549                 strlen_left = 1;
 550         }
 551         if (right->type == EXPR_CALL && sym_name_is("strlen", right->fn)) {
 552                 str = get_argument_from_call_expr(right->args, 0);
 553                 strlen_right = 1;
 554         }
 555
 556         if (!strlen_left && !strlen_right)
 557                 return;
 558         if (strlen_left && strlen_right)
 559                 return;
 560
 561         if (strlen_left) {
 562                 if (!get_value(right, &sval))
 563                         return;
 564         }
 565         if (strlen_right) {
 566                 if (!get_value(left, &sval))
 567                         return;
 568         }
 569
 570         /* FIXME:  why are we using my_size_id here instead of my_strlen_id */
 571
 572         if (expr->op == SPECIAL_EQUAL) {
 573                 set_true_false_states_expr(my_size_id, str, size_to_estate(sval.value + 1), NULL);
 574                 return;
 575         }
 576         if (expr->op == SPECIAL_NOTEQUAL) {
 577                 set_true_false_states_expr(my_size_id, str, NULL, size_to_estate(sval.value + 1));
 578                 return;
 579         }
 580
 581         switch (expr->op) {
 582         case '<':
 583         case SPECIAL_UNSIGNED_LT:
 584                 if (strlen_left)
 585                         true_state = size_to_estate(sval.value);
 586                 else
 587                         false_state = size_to_estate(sval.value + 1);
 588                 break;
 589         case SPECIAL_LTE:
 590         case SPECIAL_UNSIGNED_LTE:
 591                 if (strlen_left)
 592                         true_state = size_to_estate(sval.value + 1);
 593                 else
 594                         false_state = size_to_estate(sval.value);
 595                 break;
 596         case SPECIAL_GTE:
 597         case SPECIAL_UNSIGNED_GTE:
 598                 if (strlen_left)
 599                         false_state = size_to_estate(sval.value);
 600                 else
 601                         true_state = size_to_estate(sval.value + 1);
 602                 break;
 603         case '>':
 604         case SPECIAL_UNSIGNED_GT:
 605                 if (strlen_left) {
 606                         true_state = size_to_estate(-1);
 607                         false_state = size_to_estate(sval.value + 1);
 608                 } else
 609                         true_state = size_to_estate(sval.value);
 610                 break;
 611         }
 612         set_true_false_states_expr(my_size_id, str, true_state, false_state);
 613 }
 614
 615 static struct expression *strip_ampersands(struct expression *expr)
 616 {
 617         struct symbol *type;
 618
 619         if (expr->type != EXPR_PREOP)
 620                 return expr;
 621         if (expr->op != '&')
 622                 return expr;
 623         type = get_type(expr->unop);
 624         if (!type || type->type != SYM_ARRAY)
 625                 return expr;
 626         return expr->unop;
 627 }
 628
 629 static void info_record_alloction(struct expression *buffer, struct range_list *rl)
 630 {
 631         char *name;
 632
 633         if (!option_info)
 634                 return;
 635
 636         name = get_member_name(buffer);
 637         if (!name && is_static(buffer))
 638                 name = expr_to_var(buffer);
 639         if (!name)
 640                 return;
 641         if (rl && !is_whole_rl(rl))
 642                 sql_insert_function_type_size(name, show_rl(rl));
 643         else
 644                 sql_insert_function_type_size(name, "(-1)");
 645
 646         free_string(name);
 647 }
 648
 649 static void store_alloc(struct expression *expr, struct range_list *rl)
 650 {
 651         rl = clone_rl(rl); // FIXME!!!
 652         info_record_alloction(expr, rl);
 653         set_state_expr(my_size_id, expr, alloc_estate_rl(rl));
 654 }
 655
 656 static void match_array_assignment(struct expression *expr)
 657 {
 658         struct expression *left;
 659         struct expression *right;
 660         struct range_list *rl;
 661         sval_t sval;
 662
 663         if (expr->op != '=')
 664                 return;
 665         left = strip_expr(expr->left);
 666         right = strip_expr(expr->right);
 667         right = strip_ampersands(right);
 668
 669         if (is_allocation_function(right))
 670                 return;
 671
 672         if (get_implied_value(right, &sval) && sval.value == 0) {
 673                 rl = alloc_int_rl(0);
 674                 goto store;
 675         }
 676
 677         rl = get_array_size_bytes_rl(right);
 678
 679 store:
 680         store_alloc(left, rl);
 681 }
 682
 683 static void match_alloc(const char *fn, struct expression *expr, void *_size_arg)
 684 {
 685         int size_arg = PTR_INT(_size_arg);
 686         struct expression *right;
 687         struct expression *arg;
 688         struct range_list *rl;
 689
 690         right = strip_expr(expr->right);
 691         arg = get_argument_from_call_expr(right->args, size_arg);
 692         get_absolute_rl(arg, &rl);
 693         rl = cast_rl(&int_ctype, rl);
 694         store_alloc(expr->left, rl);
 695 }
 696
 697 static void match_calloc(const char *fn, struct expression *expr, void *unused)
 698 {
 699         struct expression *right;
 700         struct expression *arg;
 701         sval_t elements;
 702         sval_t size;
 703
 704         right = strip_expr(expr->right);
 705         arg = get_argument_from_call_expr(right->args, 0);
 706         if (!get_implied_value(arg, &elements))
 707                 return; // FIXME!!!
 708         arg = get_argument_from_call_expr(right->args, 1);
 709         if (get_implied_value(arg, &size))
 710                 store_alloc(expr->left, size_to_rl(elements.value * size.value));
 711         else
 712                 store_alloc(expr->left, size_to_rl(-1));
 713 }
 714
 715 static void match_limited(const char *fn, struct expression *expr, void *_limiter)
 716 {
 717         struct limiter *limiter = (struct limiter *)_limiter;
 718         struct expression *dest;
 719         struct expression *size_expr;
 720         sval_t size;
 721
 722         dest = get_argument_from_call_expr(expr->args, limiter->buf_arg);
 723         size_expr = get_argument_from_call_expr(expr->args, limiter->limit_arg);
 724         if (!get_implied_max(size_expr, &size))
 725                 return;
 726         set_state_expr(my_size_id, dest, size_to_estate(size.value));
 727 }
 728
 729 static void match_strcpy(const char *fn, struct expression *expr, void *unused)
 730 {
 731         struct expression fake_assign;
 732
 733         fake_assign.op = '=';
 734         fake_assign.left = get_argument_from_call_expr(expr->args, 0);
 735         fake_assign.right = get_argument_from_call_expr(expr->args, 1);
 736         match_array_assignment(&fake_assign);
 737 }
 738
 739 static void match_strndup(const char *fn, struct expression *expr, void *unused)
 740 {
 741         struct expression *fn_expr;
 742         struct expression *size_expr;
 743         sval_t size;
 744
 745         fn_expr = strip_expr(expr->right);
 746         size_expr = get_argument_from_call_expr(fn_expr->args, 1);
 747         if (get_implied_max(size_expr, &size)) {
 748                 size.value++;
 749                 store_alloc(expr->left, size_to_rl(size.value));
 750         } else {
 751                 store_alloc(expr->left, size_to_rl(-1));
 752         }
 753
 754 }
 755
 756 static void match_call(struct expression *expr)
 757 {
 758         struct expression *arg;
 759         struct range_list *rl;
 760         int i;
 761
 762         i = 0;
 763         FOR_EACH_PTR(expr->args, arg) {
 764                 rl = get_array_size_bytes_rl(arg);
 765                 if (rl && !is_whole_rl(rl))
 766                         sql_insert_caller_info(expr, BUF_SIZE, i, "$$", show_rl(rl));
 767                 i++;
 768         } END_FOR_EACH_PTR(arg);
 769 }
 770
 771 static void struct_member_callback(struct expression *call, int param, char *printed_name, struct smatch_state *state)
 772 {
 773         if (state == &merged)
 774                 return;
 775         sql_insert_caller_info(call, BUF_SIZE, param, printed_name, state->name);
 776 }
 777
 778 void register_buf_size(int id)
 779 {
 780         my_size_id = id;
 781
 782         add_unmatched_state_hook(my_size_id, &unmatched_size_state);
 783
 784         select_caller_info_hook(set_param_buf_size, BUF_SIZE);
 785         select_return_states_hook(BUF_SIZE, &db_returns_buf_size);
 786
 787         allocation_funcs = create_function_hashtable(100);
 788         add_allocation_function("malloc", &match_alloc, 0);
 789         add_allocation_function("calloc", &match_calloc, 0);
 790         add_allocation_function("memdup", &match_alloc, 1);
 791         add_allocation_function("realloc", &match_alloc, 1);
 792         if (option_project == PROJ_KERNEL) {
 793                 add_allocation_function("kmalloc", &match_alloc, 0);
 794                 add_allocation_function("kzalloc", &match_alloc, 0);
 795                 add_allocation_function("vmalloc", &match_alloc, 0);
 796                 add_allocation_function("__vmalloc", &match_alloc, 0);
 797                 add_allocation_function("kcalloc", &match_calloc, 0);
 798                 add_allocation_function("kmalloc_array", &match_calloc, 0);
 799                 add_allocation_function("drm_malloc_ab", &match_calloc, 0);
 800                 add_allocation_function("drm_calloc_large", &match_calloc, 0);
 801                 add_allocation_function("sock_kmalloc", &match_alloc, 1);
 802                 add_allocation_function("kmemdup", &match_alloc, 1);
 803                 add_allocation_function("kmemdup_user", &match_alloc, 1);
 804                 add_allocation_function("dma_alloc_attrs", &match_alloc, 1);
 805                 add_allocation_function("pci_alloc_consistent", &match_alloc, 1);
 806                 add_allocation_function("pci_alloc_coherent", &match_alloc, 1);
 807                 add_allocation_function("devm_kmalloc", &match_alloc, 1);
 808                 add_allocation_function("devm_kzalloc", &match_alloc, 1);
 809                 add_allocation_function("krealloc", &match_alloc, 1);
 810         }
 811         add_hook(&match_strlen_condition, CONDITION_HOOK);
 812
 813         add_allocation_function("strndup", match_strndup, 0);
 814         if (option_project == PROJ_KERNEL)
 815                 add_allocation_function("kstrndup", match_strndup, 0);
 816
 817         add_modification_hook(my_size_id, &set_size_undefined);
 818
 819         add_merge_hook(my_size_id, &merge_size_func);
 820 }
 821
 822 void register_buf_size_late(int id)
 823 {
 824         /* has to happen after match_alloc() */
 825         add_hook(&match_array_assignment, ASSIGNMENT_HOOK);
 826
 827         add_function_hook("strlcpy", &match_limited, &b0_l2);
 828         add_function_hook("strlcat", &match_limited, &b0_l2);
 829         add_function_hook("memscan", &match_limited, &b0_l2);
 830
 831         add_function_hook("strcpy", &match_strcpy, NULL);
 832
 833         add_hook(&match_call, FUNCTION_CALL_HOOK);
 834         add_member_info_callback(my_size_id, struct_member_callback);
 835 }