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, "$", 1) != 0)
 121                 return;
 122
 123         snprintf(fullname, 256, "%s%s", name, key + 1);
 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)
 137                 return 0;
 138         if (expr->type == EXPR_STRING)
 139                 return 1;
 140         type = get_type(expr);
 141         if (!type)
 142                 return 0;
 143
 144         if (type->type != SYM_PTR && type->type != SYM_ARRAY)
 145                 return 0;
 146
 147         type = get_base_type(type);
 148         return type_bytes(type);
 149 }
 150
 151 static int bytes_to_elements(struct expression *expr, int bytes)
 152 {
 153         int bpe;
 154
 155         bpe = bytes_per_element(expr);
 156         if (bpe == 0)
 157                 return 0;
 158         return bytes / bpe;
 159 }
 160
 161 static int elements_to_bytes(struct expression *expr, int elements)
 162 {
 163         int bpe;
 164
 165         bpe = bytes_per_element(expr);
 166         return elements * bpe;
 167 }
 168
 169 static int get_initializer_size(struct expression *expr)
 170 {
 171         switch (expr->type) {
 172         case EXPR_STRING:
 173                 return expr->string->length;
 174         case EXPR_INITIALIZER: {
 175                 struct expression *tmp;
 176                 int i = 0;
 177
 178                 FOR_EACH_PTR(expr->expr_list, tmp) {
 179                         if (tmp->type == EXPR_INDEX) {
 180                                 if (tmp->idx_to >= i)
 181                                         i = tmp->idx_to;
 182                                 else
 183                                         continue;
 184                         }
 185
 186                         i++;
 187                 } END_FOR_EACH_PTR(tmp);
 188                 return i;
 189         }
 190         case EXPR_SYMBOL:
 191                 return get_array_size(expr);
 192         }
 193         return 0;
 194 }
 195
 196 static struct range_list *db_size_rl;
 197 static int db_size_callback(void *unused, int argc, char **argv, char **azColName)
 198 {
 199         struct range_list *tmp = NULL;
 200
 201         if (!db_size_rl) {
 202                 str_to_rl(&int_ctype, argv[0], &db_size_rl);
 203         } else {
 204                 str_to_rl(&int_ctype, argv[0], &tmp);
 205                 db_size_rl = rl_union(db_size_rl, tmp);
 206         }
 207         return 0;
 208 }
 209
 210 static struct range_list *size_from_db(struct expression *expr)
 211 {
 212         int this_file_only = 0;
 213         char *name;
 214
 215         name = get_member_name(expr);
 216         if (!name && is_static(expr)) {
 217                 name = expr_to_var(expr);
 218                 this_file_only = 1;
 219         }
 220         if (!name)
 221                 return 0;
 222
 223         if (this_file_only) {
 224                 db_size_rl = NULL;
 225                 run_sql(db_size_callback, NULL,
 226                         "select size from function_type_size where type = '%s' and file = '%s';",
 227                         name, get_filename());
 228                 if (db_size_rl)
 229                         return db_size_rl;
 230                 return 0;
 231         }
 232
 233         db_size_rl = NULL;
 234         run_sql(db_size_callback, NULL,
 235                 "select size from type_size where type = '%s';",
 236                 name);
 237         return db_size_rl;
 238 }
 239
 240 static void db_returns_buf_size(struct expression *expr, int param, char *unused, char *math)
 241 {
 242         struct expression *call;
 243         sval_t sval;
 244
 245         if (expr->type != EXPR_ASSIGNMENT)
 246                 return;
 247         call = strip_expr(expr->right);
 248
 249         if (!parse_call_math(call, math, &sval))
 250                 return;
 251         set_state_expr(my_size_id, expr->left, size_to_estate(sval.value));
 252 }
 253
 254 int get_real_array_size(struct expression *expr)
 255 {
 256         struct symbol *type;
 257         sval_t sval;
 258
 259         if (!expr)
 260                 return 0;
 261         if (expr->type == EXPR_BINOP) /* array elements foo[5] */
 262                 return 0;
 263
 264         type = get_type(expr);
 265         if (!type)
 266                 return 0;
 267         if (!type || type->type != SYM_ARRAY)
 268                 return 0;
 269
 270         if (!get_implied_value(type->array_size, &sval))
 271                 return 0;
 272
 273         /* People put one element arrays on the end of structs */
 274         if (sval.value == 1)
 275                 return 0;
 276
 277         return sval.value;
 278 }
 279
 280 static int get_size_from_initializer(struct expression *expr)
 281 {
 282         if (expr->type != EXPR_SYMBOL || !expr->symbol || !expr->symbol->initializer)
 283                 return 0;
 284         if (expr->symbol->initializer == expr) /* int a = a; */
 285                 return 0;
 286         return get_initializer_size(expr->symbol->initializer);
 287 }
 288
 289 static struct range_list *get_stored_size_bytes(struct expression *expr)
 290 {
 291         struct smatch_state *state;
 292
 293         state = get_state_expr(my_size_id, expr);
 294         if (!state)
 295                 return NULL;
 296         return estate_rl(state);
 297 }
 298
 299 static int get_bytes_from_address(struct expression *expr)
 300 {
 301         struct symbol *type;
 302         int ret;
 303
 304         if (!option_spammy)
 305                 return 0;
 306         if (expr->type != EXPR_PREOP || expr->op != '&')
 307                 return 0;
 308         type = get_type(expr);
 309         if (!type)
 310                 return 0;
 311
 312         if (type->type == SYM_PTR)
 313                 type = get_base_type(type);
 314
 315         ret = type_bytes(type);
 316         if (ret == 1)
 317                 return 0;  /* ignore char pointers */
 318
 319         return ret;
 320 }
 321
 322 static struct expression *remove_addr_fluff(struct expression *expr)
 323 {
 324         struct expression *tmp;
 325         sval_t sval;
 326
 327         expr = strip_expr(expr);
 328
 329         /* remove '&' and '*' operations that cancel */
 330         while (expr && expr->type == EXPR_PREOP && expr->op == '&') {
 331                 tmp = strip_expr(expr->unop);
 332                 if (tmp->type != EXPR_PREOP)
 333                         break;
 334                 if (tmp->op != '*')
 335                         break;
 336                 expr = strip_expr(tmp->unop);
 337         }
 338
 339         if (!expr)
 340                 return NULL;
 341
 342         /* "foo + 0" is just "foo" */
 343         if (expr->type == EXPR_BINOP && expr->op == '+' &&
 344             get_value(expr->right, &sval) && sval.value == 0)
 345                 return expr->left;
 346
 347         return expr;
 348 }
 349
 350 static int is_last_member_of_struct(struct symbol *sym, struct ident *member)
 351 {
 352         struct symbol *tmp;
 353         int i;
 354
 355         i = 0;
 356         FOR_EACH_PTR_REVERSE(sym->symbol_list, tmp) {
 357                 if (i++ || !tmp->ident)
 358                         return 0;
 359                 if (tmp->ident == member)
 360                         return 1;
 361                 return 0;
 362         } END_FOR_EACH_PTR_REVERSE(tmp);
 363
 364         return 0;
 365 }
 366
 367 static int get_stored_size_end_struct_bytes(struct expression *expr)
 368 {
 369         struct symbol *type;
 370         char *name;
 371         struct symbol *sym;
 372         struct smatch_state *state;
 373         sval_t sval;
 374
 375         if (expr->type == EXPR_BINOP) /* array elements foo[5] */
 376                 return 0;
 377
 378         type = get_type(expr);
 379         if (!type || type->type != SYM_ARRAY)
 380                 return 0;
 381
 382         if (!get_implied_value(type->array_size, &sval))
 383                 return 0;
 384
 385         if (sval.value != 0 && sval.value != 1)
 386                 return 0;
 387
 388         name = expr_to_var_sym(expr, &sym);
 389         free_string(name);
 390         if (!sym || !sym->ident)
 391                 return 0;
 392         if (!type_bytes(sym))
 393                 return 0;
 394
 395         if (sym->type != SYM_NODE)
 396                 return 0;
 397
 398         state = get_state(my_size_id, sym->ident->name, sym);
 399         if (!estate_to_size(state))
 400                 return 0;
 401
 402         sym = get_real_base_type(sym);
 403         if (!sym || sym->type != SYM_PTR)
 404                 return 0;
 405         sym = get_real_base_type(sym);
 406         if (!sym || sym->type != SYM_STRUCT)
 407                 return 0;
 408         if (!is_last_member_of_struct(sym, expr->member))
 409                 return 0;
 410
 411         return estate_to_size(state) - type_bytes(sym) + type_bytes(type);
 412 }
 413
 414 static struct range_list *alloc_int_rl(int value)
 415 {
 416         sval_t sval = {
 417                 .type = &int_ctype,
 418                 {.value = value},
 419         };
 420
 421         return alloc_rl(sval, sval);
 422 }
 423
 424 struct range_list *get_array_size_bytes_rl(struct expression *expr)
 425 {
 426         int declared_size = 0;
 427         struct range_list *ret = NULL;
 428         int size;
 429
 430         expr = remove_addr_fluff(expr);
 431         if (!expr)
 432                 return NULL;
 433
 434         /* "BAR" */
 435         if (expr->type == EXPR_STRING)
 436                 return alloc_int_rl(expr->string->length);
 437
 438         if (expr->type == EXPR_BINOP && expr->op == '+') {
 439                 sval_t offset;
 440
 441                 if (!get_implied_value(expr->right, &offset))
 442                         return NULL;
 443                 size = get_array_size_bytes(expr->left);
 444                 if (size <= 0)
 445                         return NULL;
 446                 return alloc_int_rl(size - offset.value);
 447         }
 448
 449         /* buf[4] */
 450         size = get_real_array_size(expr);
 451         if (size)
 452                 declared_size = elements_to_bytes(expr, size);
 453
 454         /* buf = malloc(1024); */
 455         ret = get_stored_size_bytes(expr);
 456         if (ret) {
 457                 if (declared_size)
 458                         return rl_union(ret, alloc_int_rl(size));
 459                 return ret;
 460         }
 461         if (declared_size)
 462                 return alloc_int_rl(declared_size);
 463
 464         size = get_stored_size_end_struct_bytes(expr);
 465         if (size)
 466                 return alloc_int_rl(size);
 467
 468         /* char *foo = "BAR" */
 469         size = get_size_from_initializer(expr);
 470         if (size)
 471                 return alloc_int_rl(elements_to_bytes(expr, size));
 472
 473         size = get_bytes_from_address(expr);
 474         if (size)
 475                 return alloc_int_rl(size);
 476
 477         /* if (strlen(foo) > 4) */
 478         size = get_size_from_strlen(expr);
 479         if (size)
 480                 return alloc_int_rl(size);
 481
 482         ret = size_from_db(expr);
 483         if (ret)
 484                 return ret;
 485
 486         return NULL;
 487 }
 488
 489 int get_array_size_bytes(struct expression *expr)
 490 {
 491         struct range_list *rl;
 492         sval_t sval;
 493
 494         rl = get_array_size_bytes_rl(expr);
 495         if (!rl_to_sval(rl, &sval))
 496                 return 0;
 497         if (sval.uvalue >= INT_MAX)
 498                 return 0;
 499         return sval.value;
 500 }
 501
 502 int get_array_size_bytes_max(struct expression *expr)
 503 {
 504         struct range_list *rl;
 505         sval_t bytes;
 506
 507         rl = get_array_size_bytes_rl(expr);
 508         if (!rl)
 509                 return 0;
 510         bytes = rl_min(rl);
 511         if (bytes.value < 0)
 512                 return 0;
 513         bytes = rl_max(rl);
 514         if (bytes.uvalue >= INT_MAX)
 515                 return 0;
 516         return bytes.value;
 517 }
 518
 519 int get_array_size_bytes_min(struct expression *expr)
 520 {
 521         struct range_list *rl;
 522         struct data_range *range;
 523
 524         rl = get_array_size_bytes_rl(expr);
 525         if (!rl)
 526                 return 0;
 527
 528         FOR_EACH_PTR(rl, range) {
 529                 if (range->min.value <= 0)
 530                         return 0;
 531                 if (range->max.value <= 0)
 532                         return 0;
 533                 if (range->min.uvalue >= INT_MAX)
 534                         return 0;
 535                 return range->min.value;
 536         } END_FOR_EACH_PTR(range);
 537
 538         return 0;
 539 }
 540
 541 int get_array_size(struct expression *expr)
 542 {
 543         if (!expr)
 544                 return 0;
 545         return bytes_to_elements(expr, get_array_size_bytes_max(expr));
 546 }
 547
 548 static void match_strlen_condition(struct expression *expr)
 549 {
 550         struct expression *left;
 551         struct expression *right;
 552         struct expression *str = NULL;
 553         int strlen_left = 0;
 554         int strlen_right = 0;
 555         sval_t sval;
 556         struct smatch_state *true_state = NULL;
 557         struct smatch_state *false_state = NULL;
 558
 559         if (expr->type != EXPR_COMPARE)
 560                 return;
 561         left = strip_expr(expr->left);
 562         right = strip_expr(expr->right);
 563
 564         if (left->type == EXPR_CALL && sym_name_is("strlen", left->fn)) {
 565                 str = get_argument_from_call_expr(left->args, 0);
 566                 strlen_left = 1;
 567         }
 568         if (right->type == EXPR_CALL && sym_name_is("strlen", right->fn)) {
 569                 str = get_argument_from_call_expr(right->args, 0);
 570                 strlen_right = 1;
 571         }
 572
 573         if (!strlen_left && !strlen_right)
 574                 return;
 575         if (strlen_left && strlen_right)
 576                 return;
 577
 578         if (strlen_left) {
 579                 if (!get_value(right, &sval))
 580                         return;
 581         }
 582         if (strlen_right) {
 583                 if (!get_value(left, &sval))
 584                         return;
 585         }
 586
 587         /* FIXME:  why are we using my_size_id here instead of my_strlen_id */
 588
 589         if (expr->op == SPECIAL_EQUAL) {
 590                 set_true_false_states_expr(my_size_id, str, size_to_estate(sval.value + 1), NULL);
 591                 return;
 592         }
 593         if (expr->op == SPECIAL_NOTEQUAL) {
 594                 set_true_false_states_expr(my_size_id, str, NULL, size_to_estate(sval.value + 1));
 595                 return;
 596         }
 597
 598         switch (expr->op) {
 599         case '<':
 600         case SPECIAL_UNSIGNED_LT:
 601                 if (strlen_left)
 602                         true_state = size_to_estate(sval.value);
 603                 else
 604                         false_state = size_to_estate(sval.value + 1);
 605                 break;
 606         case SPECIAL_LTE:
 607         case SPECIAL_UNSIGNED_LTE:
 608                 if (strlen_left)
 609                         true_state = size_to_estate(sval.value + 1);
 610                 else
 611                         false_state = size_to_estate(sval.value);
 612                 break;
 613         case SPECIAL_GTE:
 614         case SPECIAL_UNSIGNED_GTE:
 615                 if (strlen_left)
 616                         false_state = size_to_estate(sval.value);
 617                 else
 618                         true_state = size_to_estate(sval.value + 1);
 619                 break;
 620         case '>':
 621         case SPECIAL_UNSIGNED_GT:
 622                 if (strlen_left) {
 623                         true_state = size_to_estate(-1);
 624                         false_state = size_to_estate(sval.value + 1);
 625                 } else
 626                         true_state = size_to_estate(sval.value);
 627                 break;
 628         }
 629         set_true_false_states_expr(my_size_id, str, true_state, false_state);
 630 }
 631
 632 static struct expression *strip_ampersands(struct expression *expr)
 633 {
 634         struct symbol *type;
 635
 636         if (expr->type != EXPR_PREOP)
 637                 return expr;
 638         if (expr->op != '&')
 639                 return expr;
 640         type = get_type(expr->unop);
 641         if (!type || type->type != SYM_ARRAY)
 642                 return expr;
 643         return expr->unop;
 644 }
 645
 646 static void info_record_alloction(struct expression *buffer, struct range_list *rl)
 647 {
 648         char *name;
 649
 650         if (!option_info)
 651                 return;
 652
 653         name = get_member_name(buffer);
 654         if (!name && is_static(buffer))
 655                 name = expr_to_var(buffer);
 656         if (!name)
 657                 return;
 658         if (rl && !is_whole_rl(rl))
 659                 sql_insert_function_type_size(name, show_rl(rl));
 660         else
 661                 sql_insert_function_type_size(name, "(-1)");
 662
 663         free_string(name);
 664 }
 665
 666 static void store_alloc(struct expression *expr, struct range_list *rl)
 667 {
 668         rl = clone_rl(rl); // FIXME!!!
 669         info_record_alloction(expr, rl);
 670         set_state_expr(my_size_id, expr, alloc_estate_rl(rl));
 671 }
 672
 673 static void match_array_assignment(struct expression *expr)
 674 {
 675         struct expression *left;
 676         struct expression *right;
 677         char *left_member, *right_member;
 678         struct range_list *rl;
 679         sval_t sval;
 680
 681         if (expr->op != '=')
 682                 return;
 683         left = strip_expr(expr->left);
 684         right = strip_expr(expr->right);
 685         right = strip_ampersands(right);
 686
 687         if (!is_pointer(left))
 688                 return;
 689         if (is_allocation_function(right))
 690                 return;
 691
 692         left_member = get_member_name(left);
 693         right_member = get_member_name(right);
 694         if (left_member && right_member && strcmp(left_member, right_member) == 0) {
 695                 free_string(left_member);
 696                 free_string(right_member);
 697                 return;
 698         }
 699         free_string(left_member);
 700         free_string(right_member);
 701
 702         if (get_implied_value(right, &sval) && sval.value == 0) {
 703                 rl = alloc_int_rl(0);
 704                 goto store;
 705         }
 706
 707         rl = get_array_size_bytes_rl(right);
 708
 709 store:
 710         store_alloc(left, rl);
 711 }
 712
 713 static void match_alloc(const char *fn, struct expression *expr, void *_size_arg)
 714 {
 715         int size_arg = PTR_INT(_size_arg);
 716         struct expression *right;
 717         struct expression *arg;
 718         struct range_list *rl;
 719
 720         right = strip_expr(expr->right);
 721         arg = get_argument_from_call_expr(right->args, size_arg);
 722         get_absolute_rl(arg, &rl);
 723         rl = cast_rl(&int_ctype, rl);
 724         store_alloc(expr->left, rl);
 725 }
 726
 727 static void match_calloc(const char *fn, struct expression *expr, void *unused)
 728 {
 729         struct expression *right;
 730         struct expression *arg;
 731         sval_t elements;
 732         sval_t size;
 733
 734         right = strip_expr(expr->right);
 735         arg = get_argument_from_call_expr(right->args, 0);
 736         if (!get_implied_value(arg, &elements))
 737                 return; // FIXME!!!
 738         arg = get_argument_from_call_expr(right->args, 1);
 739         if (get_implied_value(arg, &size))
 740                 store_alloc(expr->left, size_to_rl(elements.value * size.value));
 741         else
 742                 store_alloc(expr->left, size_to_rl(-1));
 743 }
 744
 745 static void match_limited(const char *fn, struct expression *expr, void *_limiter)
 746 {
 747         struct limiter *limiter = (struct limiter *)_limiter;
 748         struct expression *dest;
 749         struct expression *size_expr;
 750         sval_t size;
 751
 752         dest = get_argument_from_call_expr(expr->args, limiter->buf_arg);
 753         size_expr = get_argument_from_call_expr(expr->args, limiter->limit_arg);
 754         if (!get_implied_max(size_expr, &size))
 755                 return;
 756         set_state_expr(my_size_id, dest, size_to_estate(size.value));
 757 }
 758
 759 static void match_strcpy(const char *fn, struct expression *expr, void *unused)
 760 {
 761         struct expression fake_assign;
 762
 763         fake_assign.op = '=';
 764         fake_assign.left = get_argument_from_call_expr(expr->args, 0);
 765         fake_assign.right = get_argument_from_call_expr(expr->args, 1);
 766         match_array_assignment(&fake_assign);
 767 }
 768
 769 static void match_strndup(const char *fn, struct expression *expr, void *unused)
 770 {
 771         struct expression *fn_expr;
 772         struct expression *size_expr;
 773         sval_t size;
 774
 775         fn_expr = strip_expr(expr->right);
 776         size_expr = get_argument_from_call_expr(fn_expr->args, 1);
 777         if (get_implied_max(size_expr, &size)) {
 778                 size.value++;
 779                 store_alloc(expr->left, size_to_rl(size.value));
 780         } else {
 781                 store_alloc(expr->left, size_to_rl(-1));
 782         }
 783
 784 }
 785
 786 static void match_call(struct expression *expr)
 787 {
 788         struct expression *arg;
 789         struct symbol *type;
 790         struct range_list *rl;
 791         int i;
 792
 793         i = -1;
 794         FOR_EACH_PTR(expr->args, arg) {
 795                 i++;
 796                 type = get_type(arg);
 797                 if (!type || (type->type != SYM_PTR && type->type != SYM_ARRAY))
 798                         continue;
 799                 rl = get_array_size_bytes_rl(arg);
 800                 if (!rl)
 801                         continue;
 802                 if (is_whole_rl(rl))
 803                         continue;
 804                 sql_insert_caller_info(expr, BUF_SIZE, i, "$", show_rl(rl));
 805         } END_FOR_EACH_PTR(arg);
 806 }
 807
 808 static void struct_member_callback(struct expression *call, int param, char *printed_name, struct sm_state *sm)
 809 {
 810         if (sm->state == &merged)
 811                 return;
 812         sql_insert_caller_info(call, BUF_SIZE, param, printed_name, sm->state->name);
 813 }
 814
 815 void register_buf_size(int id)
 816 {
 817         my_size_id = id;
 818
 819         add_unmatched_state_hook(my_size_id, &unmatched_size_state);
 820
 821         select_caller_info_hook(set_param_buf_size, BUF_SIZE);
 822         select_return_states_hook(BUF_SIZE, &db_returns_buf_size);
 823
 824         allocation_funcs = create_function_hashtable(100);
 825         add_allocation_function("malloc", &match_alloc, 0);
 826         add_allocation_function("calloc", &match_calloc, 0);
 827         add_allocation_function("memdup", &match_alloc, 1);
 828         add_allocation_function("realloc", &match_alloc, 1);
 829         if (option_project == PROJ_KERNEL) {
 830                 add_allocation_function("kmalloc", &match_alloc, 0);
 831                 add_allocation_function("kzalloc", &match_alloc, 0);
 832                 add_allocation_function("vmalloc", &match_alloc, 0);
 833                 add_allocation_function("__vmalloc", &match_alloc, 0);
 834                 add_allocation_function("kcalloc", &match_calloc, 0);
 835                 add_allocation_function("kmalloc_array", &match_calloc, 0);
 836                 add_allocation_function("drm_malloc_ab", &match_calloc, 0);
 837                 add_allocation_function("drm_calloc_large", &match_calloc, 0);
 838                 add_allocation_function("sock_kmalloc", &match_alloc, 1);
 839                 add_allocation_function("kmemdup", &match_alloc, 1);
 840                 add_allocation_function("kmemdup_user", &match_alloc, 1);
 841                 add_allocation_function("dma_alloc_attrs", &match_alloc, 1);
 842                 add_allocation_function("pci_alloc_consistent", &match_alloc, 1);
 843                 add_allocation_function("pci_alloc_coherent", &match_alloc, 1);
 844                 add_allocation_function("devm_kmalloc", &match_alloc, 1);
 845                 add_allocation_function("devm_kzalloc", &match_alloc, 1);
 846                 add_allocation_function("krealloc", &match_alloc, 1);
 847         }
 848         add_hook(&match_strlen_condition, CONDITION_HOOK);
 849
 850         add_allocation_function("strndup", match_strndup, 0);
 851         if (option_project == PROJ_KERNEL)
 852                 add_allocation_function("kstrndup", match_strndup, 0);
 853
 854         add_modification_hook(my_size_id, &set_size_undefined);
 855
 856         add_merge_hook(my_size_id, &merge_size_func);
 857 }
 858
 859 void register_buf_size_late(int id)
 860 {
 861         /* has to happen after match_alloc() */
 862         add_hook(&match_array_assignment, ASSIGNMENT_HOOK);
 863
 864         add_function_hook("strlcpy", &match_limited, &b0_l2);
 865         add_function_hook("strlcat", &match_limited, &b0_l2);
 866         add_function_hook("memscan", &match_limited, &b0_l2);
 867
 868         add_function_hook("strcpy", &match_strcpy, NULL);
 869
 870         add_hook(&match_call, FUNCTION_CALL_HOOK);
 871         add_member_info_callback(my_size_id, struct_member_callback);
 872 }