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 last_member_is_resizable(struct symbol *sym)
 368 {
 369         struct symbol *last_member;
 370         struct symbol *type;
 371         sval_t sval;
 372
 373         last_member = last_ptr_list((struct ptr_list *)sym->symbol_list);
 374         if (!last_member || !last_member->ident)
 375                 return 0;
 376
 377         type = get_real_base_type(last_member);
 378         if (type->type == SYM_STRUCT)
 379                 return last_member_is_resizable(type);
 380         if (type->type != SYM_ARRAY)
 381                 return 0;
 382
 383         if (!get_implied_value(type->array_size, &sval))
 384                 return 0;
 385
 386         if (sval.value != 0 && sval.value != 1)
 387                 return 0;
 388
 389         return 1;
 390 }
 391
 392 static int get_stored_size_end_struct_bytes(struct expression *expr)
 393 {
 394         struct symbol *sym;
 395         struct symbol *base_sym;
 396         struct smatch_state *state;
 397
 398         if (expr->type == EXPR_BINOP) /* array elements foo[5] */
 399                 return 0;
 400
 401         if (expr->type == EXPR_PREOP && expr->op == '&')
 402                 expr = strip_parens(expr->unop);
 403
 404         sym = expr_to_sym(expr);
 405         if (!sym || !sym->ident)
 406                 return 0;
 407         if (!type_bytes(sym))
 408                 return 0;
 409         if (sym->type != SYM_NODE)
 410                 return 0;
 411
 412         base_sym = get_real_base_type(sym);
 413         if (!base_sym || base_sym->type != SYM_PTR)
 414                 return 0;
 415         base_sym = get_real_base_type(base_sym);
 416         if (!base_sym || base_sym->type != SYM_STRUCT)
 417                 return 0;
 418
 419         if (!is_last_member_of_struct(base_sym, expr->member))
 420                 return 0;
 421         if (!last_member_is_resizable(base_sym))
 422                 return 0;
 423
 424         state = get_state(my_size_id, sym->ident->name, sym);
 425         if (!estate_to_size(state))
 426                 return 0;
 427
 428         return estate_to_size(state) - type_bytes(base_sym) + type_bytes(get_type(expr));
 429 }
 430
 431 static struct range_list *alloc_int_rl(int value)
 432 {
 433         sval_t sval = {
 434                 .type = &int_ctype,
 435                 {.value = value},
 436         };
 437
 438         return alloc_rl(sval, sval);
 439 }
 440
 441 struct range_list *get_array_size_bytes_rl(struct expression *expr)
 442 {
 443         int declared_size = 0;
 444         struct range_list *ret = NULL;
 445         int size;
 446
 447         expr = remove_addr_fluff(expr);
 448         if (!expr)
 449                 return NULL;
 450
 451         /* "BAR" */
 452         if (expr->type == EXPR_STRING)
 453                 return alloc_int_rl(expr->string->length);
 454
 455         if (expr->type == EXPR_BINOP && expr->op == '+') {
 456                 sval_t offset;
 457
 458                 if (!get_implied_value(expr->right, &offset))
 459                         return NULL;
 460                 size = get_array_size_bytes(expr->left);
 461                 if (size <= 0)
 462                         return NULL;
 463                 return alloc_int_rl(size - offset.value);
 464         }
 465
 466         /* buf[4] */
 467         size = get_real_array_size(expr);
 468         if (size)
 469                 declared_size = elements_to_bytes(expr, size);
 470
 471         /* buf = malloc(1024); */
 472         ret = get_stored_size_bytes(expr);
 473         if (ret) {
 474                 if (declared_size)
 475                         return rl_union(ret, alloc_int_rl(size));
 476                 return ret;
 477         }
 478         if (declared_size)
 479                 return alloc_int_rl(declared_size);
 480
 481         size = get_stored_size_end_struct_bytes(expr);
 482         if (size)
 483                 return alloc_int_rl(size);
 484
 485         /* char *foo = "BAR" */
 486         size = get_size_from_initializer(expr);
 487         if (size)
 488                 return alloc_int_rl(elements_to_bytes(expr, size));
 489
 490         size = get_bytes_from_address(expr);
 491         if (size)
 492                 return alloc_int_rl(size);
 493
 494
 495         ret = size_from_db(expr);
 496         if (ret)
 497                 return ret;
 498
 499         return NULL;
 500 }
 501
 502 int get_array_size_bytes(struct expression *expr)
 503 {
 504         struct range_list *rl;
 505         sval_t sval;
 506
 507         rl = get_array_size_bytes_rl(expr);
 508         if (!rl_to_sval(rl, &sval))
 509                 return 0;
 510         if (sval.uvalue >= INT_MAX)
 511                 return 0;
 512         return sval.value;
 513 }
 514
 515 int get_array_size_bytes_max(struct expression *expr)
 516 {
 517         struct range_list *rl;
 518         sval_t bytes;
 519
 520         rl = get_array_size_bytes_rl(expr);
 521         if (!rl)
 522                 return 0;
 523         bytes = rl_min(rl);
 524         if (bytes.value < 0)
 525                 return 0;
 526         bytes = rl_max(rl);
 527         if (bytes.uvalue >= INT_MAX)
 528                 return 0;
 529         return bytes.value;
 530 }
 531
 532 int get_array_size_bytes_min(struct expression *expr)
 533 {
 534         struct range_list *rl;
 535         struct data_range *range;
 536
 537         rl = get_array_size_bytes_rl(expr);
 538         if (!rl)
 539                 return 0;
 540
 541         FOR_EACH_PTR(rl, range) {
 542                 if (range->min.value <= 0)
 543                         return 0;
 544                 if (range->max.value <= 0)
 545                         return 0;
 546                 if (range->min.uvalue >= INT_MAX)
 547                         return 0;
 548                 return range->min.value;
 549         } END_FOR_EACH_PTR(range);
 550
 551         return 0;
 552 }
 553
 554 int get_array_size(struct expression *expr)
 555 {
 556         if (!expr)
 557                 return 0;
 558         return bytes_to_elements(expr, get_array_size_bytes_max(expr));
 559 }
 560
 561 static struct expression *strip_ampersands(struct expression *expr)
 562 {
 563         struct symbol *type;
 564
 565         if (expr->type != EXPR_PREOP)
 566                 return expr;
 567         if (expr->op != '&')
 568                 return expr;
 569         type = get_type(expr->unop);
 570         if (!type || type->type != SYM_ARRAY)
 571                 return expr;
 572         return expr->unop;
 573 }
 574
 575 static void info_record_alloction(struct expression *buffer, struct range_list *rl)
 576 {
 577         char *name;
 578
 579         if (!option_info)
 580                 return;
 581
 582         name = get_member_name(buffer);
 583         if (!name && is_static(buffer))
 584                 name = expr_to_var(buffer);
 585         if (!name)
 586                 return;
 587         if (rl && !is_whole_rl(rl))
 588                 sql_insert_function_type_size(name, show_rl(rl));
 589         else
 590                 sql_insert_function_type_size(name, "(-1)");
 591
 592         free_string(name);
 593 }
 594
 595 static void store_alloc(struct expression *expr, struct range_list *rl)
 596 {
 597         struct symbol *type;
 598
 599         rl = clone_rl(rl); // FIXME!!!
 600         set_state_expr(my_size_id, expr, alloc_estate_rl(rl));
 601
 602         type = get_type(expr);
 603         if (!type)
 604                 return;
 605         if (type->type != SYM_PTR)
 606                 return;
 607         type = get_real_base_type(type);
 608         if (!type)
 609                 return;
 610         if (type == &void_ctype)
 611                 return;
 612         if (type->type != SYM_BASETYPE)
 613                 return;
 614
 615         info_record_alloction(expr, rl);
 616 }
 617
 618 static void match_array_assignment(struct expression *expr)
 619 {
 620         struct expression *left;
 621         struct expression *right;
 622         char *left_member, *right_member;
 623         struct range_list *rl;
 624         sval_t sval;
 625
 626         if (expr->op != '=')
 627                 return;
 628         left = strip_expr(expr->left);
 629         right = strip_expr(expr->right);
 630         right = strip_ampersands(right);
 631
 632         if (!is_pointer(left))
 633                 return;
 634         if (is_allocation_function(right))
 635                 return;
 636
 637         left_member = get_member_name(left);
 638         right_member = get_member_name(right);
 639         if (left_member && right_member && strcmp(left_member, right_member) == 0) {
 640                 free_string(left_member);
 641                 free_string(right_member);
 642                 return;
 643         }
 644         free_string(left_member);
 645         free_string(right_member);
 646
 647         if (get_implied_value(right, &sval) && sval.value == 0) {
 648                 rl = alloc_int_rl(0);
 649                 goto store;
 650         }
 651
 652         rl = get_array_size_bytes_rl(right);
 653
 654 store:
 655         store_alloc(left, rl);
 656 }
 657
 658 static void match_alloc(const char *fn, struct expression *expr, void *_size_arg)
 659 {
 660         int size_arg = PTR_INT(_size_arg);
 661         struct expression *right;
 662         struct expression *arg;
 663         struct range_list *rl;
 664
 665         right = strip_expr(expr->right);
 666         arg = get_argument_from_call_expr(right->args, size_arg);
 667         get_absolute_rl(arg, &rl);
 668         rl = cast_rl(&int_ctype, rl);
 669         store_alloc(expr->left, rl);
 670 }
 671
 672 static void match_calloc(const char *fn, struct expression *expr, void *unused)
 673 {
 674         struct expression *right;
 675         struct expression *arg;
 676         sval_t elements;
 677         sval_t size;
 678
 679         right = strip_expr(expr->right);
 680         arg = get_argument_from_call_expr(right->args, 0);
 681         if (!get_implied_value(arg, &elements))
 682                 return; // FIXME!!!
 683         arg = get_argument_from_call_expr(right->args, 1);
 684         if (get_implied_value(arg, &size))
 685                 store_alloc(expr->left, size_to_rl(elements.value * size.value));
 686         else
 687                 store_alloc(expr->left, size_to_rl(-1));
 688 }
 689
 690 static void match_page(const char *fn, struct expression *expr, void *_unused)
 691 {
 692         sval_t page_size = {
 693                 .type = &int_ctype,
 694                 .value = 4096,
 695         };
 696
 697         store_alloc(expr->left, alloc_rl(page_size, page_size));
 698 }
 699
 700 static void match_limited(const char *fn, struct expression *expr, void *_limiter)
 701 {
 702         struct limiter *limiter = (struct limiter *)_limiter;
 703         struct expression *dest;
 704         struct expression *size_expr;
 705         sval_t size;
 706
 707         dest = get_argument_from_call_expr(expr->args, limiter->buf_arg);
 708         size_expr = get_argument_from_call_expr(expr->args, limiter->limit_arg);
 709         if (!get_implied_max(size_expr, &size))
 710                 return;
 711         set_state_expr(my_size_id, dest, size_to_estate(size.value));
 712 }
 713
 714 static void match_strcpy(const char *fn, struct expression *expr, void *unused)
 715 {
 716         struct expression fake_assign;
 717
 718         fake_assign.op = '=';
 719         fake_assign.left = get_argument_from_call_expr(expr->args, 0);
 720         fake_assign.right = get_argument_from_call_expr(expr->args, 1);
 721         match_array_assignment(&fake_assign);
 722 }
 723
 724 static void match_strndup(const char *fn, struct expression *expr, void *unused)
 725 {
 726         struct expression *fn_expr;
 727         struct expression *size_expr;
 728         sval_t size;
 729
 730         fn_expr = strip_expr(expr->right);
 731         size_expr = get_argument_from_call_expr(fn_expr->args, 1);
 732         if (get_implied_max(size_expr, &size)) {
 733                 size.value++;
 734                 store_alloc(expr->left, size_to_rl(size.value));
 735         } else {
 736                 store_alloc(expr->left, size_to_rl(-1));
 737         }
 738
 739 }
 740
 741 static void match_call(struct expression *expr)
 742 {
 743         struct expression *arg;
 744         struct symbol *type;
 745         struct range_list *rl;
 746         int i;
 747
 748         i = -1;
 749         FOR_EACH_PTR(expr->args, arg) {
 750                 i++;
 751                 type = get_type(arg);
 752                 if (!type || (type->type != SYM_PTR && type->type != SYM_ARRAY))
 753                         continue;
 754                 rl = get_array_size_bytes_rl(arg);
 755                 if (!rl)
 756                         continue;
 757                 if (is_whole_rl(rl))
 758                         continue;
 759                 sql_insert_caller_info(expr, BUF_SIZE, i, "$", show_rl(rl));
 760         } END_FOR_EACH_PTR(arg);
 761 }
 762
 763 static void struct_member_callback(struct expression *call, int param, char *printed_name, struct sm_state *sm)
 764 {
 765         if (sm->state == &merged ||
 766             strcmp(sm->state->name, "(-1)") == 0 ||
 767             strcmp(sm->state->name, "empty") == 0 ||
 768             strcmp(sm->state->name, "0") == 0)
 769                 return;
 770         sql_insert_caller_info(call, BUF_SIZE, param, printed_name, sm->state->name);
 771 }
 772
 773 void register_buf_size(int id)
 774 {
 775         my_size_id = id;
 776
 777         add_unmatched_state_hook(my_size_id, &unmatched_size_state);
 778
 779         select_caller_info_hook(set_param_buf_size, BUF_SIZE);
 780         select_return_states_hook(BUF_SIZE, &db_returns_buf_size);
 781
 782         allocation_funcs = create_function_hashtable(100);
 783         add_allocation_function("malloc", &match_alloc, 0);
 784         add_allocation_function("calloc", &match_calloc, 0);
 785         add_allocation_function("memdup", &match_alloc, 1);
 786         add_allocation_function("realloc", &match_alloc, 1);
 787         if (option_project == PROJ_KERNEL) {
 788                 add_allocation_function("kmalloc", &match_alloc, 0);
 789                 add_allocation_function("kzalloc", &match_alloc, 0);
 790                 add_allocation_function("vmalloc", &match_alloc, 0);
 791                 add_allocation_function("__vmalloc", &match_alloc, 0);
 792                 add_allocation_function("kcalloc", &match_calloc, 0);
 793                 add_allocation_function("kmalloc_array", &match_calloc, 0);
 794                 add_allocation_function("drm_malloc_ab", &match_calloc, 0);
 795                 add_allocation_function("drm_calloc_large", &match_calloc, 0);
 796                 add_allocation_function("sock_kmalloc", &match_alloc, 1);
 797                 add_allocation_function("kmemdup", &match_alloc, 1);
 798                 add_allocation_function("kmemdup_user", &match_alloc, 1);
 799                 add_allocation_function("dma_alloc_attrs", &match_alloc, 1);
 800                 add_allocation_function("pci_alloc_consistent", &match_alloc, 1);
 801                 add_allocation_function("pci_alloc_coherent", &match_alloc, 1);
 802                 add_allocation_function("devm_kmalloc", &match_alloc, 1);
 803                 add_allocation_function("devm_kzalloc", &match_alloc, 1);
 804                 add_allocation_function("krealloc", &match_alloc, 1);
 805                 add_allocation_function("kmap", &match_page, 0);
 806                 add_allocation_function("get_zeroed_page", &match_page, 0);
 807         }
 808
 809         add_allocation_function("strndup", match_strndup, 0);
 810         if (option_project == PROJ_KERNEL)
 811                 add_allocation_function("kstrndup", match_strndup, 0);
 812
 813         add_modification_hook(my_size_id, &set_size_undefined);
 814
 815         add_merge_hook(my_size_id, &merge_size_func);
 816 }
 817
 818 void register_buf_size_late(int id)
 819 {
 820         /* has to happen after match_alloc() */
 821         add_hook(&match_array_assignment, ASSIGNMENT_HOOK);
 822
 823         add_function_hook("strlcpy", &match_limited, &b0_l2);
 824         add_function_hook("strlcat", &match_limited, &b0_l2);
 825         add_function_hook("memscan", &match_limited, &b0_l2);
 826
 827         add_function_hook("strcpy", &match_strcpy, NULL);
 828
 829         add_hook(&match_call, FUNCTION_CALL_HOOK);
 830         add_member_info_callback(my_size_id, struct_member_callback);
 831 }