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 static DEFINE_HASHTABLE_INSERT(insert_func, char, int);
  31 static DEFINE_HASHTABLE_SEARCH(search_func, char, int);
  32 static struct hashtable *allocation_funcs;
  33
  34 static char *get_fn_name(struct expression *expr)
  35 {
  36         if (expr->type != EXPR_CALL)
  37                 return NULL;
  38         if (expr->fn->type != EXPR_SYMBOL)
  39                 return NULL;
  40         return expr_to_var(expr->fn);
  41 }
  42
  43 static int is_allocation_function(struct expression *expr)
  44 {
  45         char *func;
  46         int ret = 0;
  47
  48         func = get_fn_name(expr);
  49         if (!func)
  50                 return 0;
  51         if (search_func(allocation_funcs, func))
  52                 ret = 1;
  53         free_string(func);
  54         return ret;
  55 }
  56
  57 static void add_allocation_function(const char *func, void *call_back, int param)
  58 {
  59         insert_func(allocation_funcs, (char *)func, (int *)1);
  60         add_function_assign_hook(func, call_back, INT_PTR(param));
  61 }
  62
  63 static int estate_to_size(struct smatch_state *state)
  64 {
  65         sval_t sval;
  66
  67         if (!state || !estate_rl(state))
  68                 return 0;
  69         sval = estate_max(state);
  70         return sval.value;
  71 }
  72
  73 static struct smatch_state *size_to_estate(int size)
  74 {
  75         sval_t sval;
  76
  77         sval.type = &int_ctype;
  78         sval.value = size;
  79
  80         return alloc_estate_sval(sval);
  81 }
  82
  83 static struct range_list *size_to_rl(int size)
  84 {
  85         sval_t sval;
  86
  87         sval.type = &int_ctype;
  88         sval.value = size;
  89
  90         return alloc_rl(sval, sval);
  91 }
  92
  93 static struct smatch_state *unmatched_size_state(struct sm_state *sm)
  94 {
  95         return size_to_estate(UNKNOWN_SIZE);
  96 }
  97
  98 static void set_size_undefined(struct sm_state *sm, struct expression *mod_expr)
  99 {
 100         set_state(sm->owner, sm->name, sm->sym, size_to_estate(UNKNOWN_SIZE));
 101 }
 102
 103 static struct smatch_state *merge_size_func(struct smatch_state *s1, struct smatch_state *s2)
 104 {
 105         return merge_estates(s1, s2);
 106 }
 107
 108 void set_param_buf_size(const char *name, struct symbol *sym, char *key, char *value)
 109 {
 110         struct range_list *rl = NULL;
 111         struct smatch_state *state;
 112         char fullname[256];
 113
 114         if (strncmp(key, "$", 1) != 0)
 115                 return;
 116
 117         snprintf(fullname, 256, "%s%s", name, key + 1);
 118
 119         str_to_rl(&int_ctype, value, &rl);
 120         if (!rl || is_whole_rl(rl))
 121                 return;
 122         state = alloc_estate_rl(rl);
 123         set_state(my_size_id, fullname, sym, state);
 124 }
 125
 126 static int bytes_per_element(struct expression *expr)
 127 {
 128         struct symbol *type;
 129
 130         if (!expr)
 131                 return 0;
 132         if (expr->type == EXPR_STRING)
 133                 return 1;
 134         if (expr->type == EXPR_PREOP && expr->op == '&') {
 135                 type = get_type(expr->unop);
 136                 if (type && type->type == SYM_ARRAY)
 137                         expr = expr->unop;
 138         }
 139         type = get_type(expr);
 140         if (!type)
 141                 return 0;
 142
 143         if (type->type != SYM_PTR && type->type != SYM_ARRAY)
 144                 return 0;
 145
 146         type = get_base_type(type);
 147         return type_bytes(type);
 148 }
 149
 150 static int bytes_to_elements(struct expression *expr, int bytes)
 151 {
 152         int bpe;
 153
 154         bpe = bytes_per_element(expr);
 155         if (bpe == 0)
 156                 return 0;
 157         return bytes / bpe;
 158 }
 159
 160 static int elements_to_bytes(struct expression *expr, int elements)
 161 {
 162         int bpe;
 163
 164         bpe = bytes_per_element(expr);
 165         return elements * bpe;
 166 }
 167
 168 static int get_initializer_size(struct expression *expr)
 169 {
 170         switch (expr->type) {
 171         case EXPR_STRING:
 172                 return expr->string->length;
 173         case EXPR_INITIALIZER: {
 174                 struct expression *tmp;
 175                 int i = 0;
 176
 177                 FOR_EACH_PTR(expr->expr_list, tmp) {
 178                         if (tmp->type == EXPR_INDEX) {
 179                                 if (tmp->idx_to >= i)
 180                                         i = tmp->idx_to;
 181                                 else
 182                                         continue;
 183                         }
 184
 185                         i++;
 186                 } END_FOR_EACH_PTR(tmp);
 187                 return i;
 188         }
 189         case EXPR_SYMBOL:
 190                 return get_array_size(expr);
 191         }
 192         return 0;
 193 }
 194
 195 static struct range_list *db_size_rl;
 196 static int db_size_callback(void *unused, int argc, char **argv, char **azColName)
 197 {
 198         struct range_list *tmp = NULL;
 199
 200         if (!db_size_rl) {
 201                 str_to_rl(&int_ctype, argv[0], &db_size_rl);
 202         } else {
 203                 str_to_rl(&int_ctype, argv[0], &tmp);
 204                 db_size_rl = rl_union(db_size_rl, tmp);
 205         }
 206         return 0;
 207 }
 208
 209 static struct range_list *size_from_db_type(struct expression *expr)
 210 {
 211         int this_file_only = 0;
 212         char *name;
 213
 214         name = get_member_name(expr);
 215         if (!name && is_static(expr)) {
 216                 name = expr_to_var(expr);
 217                 this_file_only = 1;
 218         }
 219         if (!name)
 220                 return NULL;
 221
 222         if (this_file_only) {
 223                 db_size_rl = NULL;
 224                 run_sql(db_size_callback, NULL,
 225                         "select size from function_type_size where type = '%s' and file = '%s';",
 226                         name, get_filename());
 227                 if (db_size_rl)
 228                         return db_size_rl;
 229                 return NULL;
 230         }
 231
 232         db_size_rl = NULL;
 233         run_sql(db_size_callback, NULL,
 234                 "select size from type_size where type = '%s';",
 235                 name);
 236         return db_size_rl;
 237 }
 238
 239 static struct range_list *size_from_db_symbol(struct expression *expr)
 240 {
 241         struct symbol *sym;
 242
 243         if (expr->type != EXPR_SYMBOL)
 244                 return NULL;
 245         sym = expr->symbol;
 246         if (!sym || !sym->ident ||
 247             !(sym->ctype.modifiers & MOD_TOPLEVEL) ||
 248             sym->ctype.modifiers & MOD_STATIC)
 249                 return NULL;
 250
 251         db_size_rl = NULL;
 252         run_sql(db_size_callback, NULL,
 253                 "select value from data_info where file = 'extern' and data = '%s' and type = %d;",
 254                 sym->ident->name, BUF_SIZE);
 255         return db_size_rl;
 256 }
 257
 258 static struct range_list *size_from_db(struct expression *expr)
 259 {
 260         struct range_list *rl;
 261
 262         rl = size_from_db_symbol(expr);
 263         if (rl)
 264                 return rl;
 265         return size_from_db_type(expr);
 266 }
 267
 268 static void db_returns_buf_size(struct expression *expr, int param, char *unused, char *math)
 269 {
 270         struct expression *call;
 271         struct range_list *rl;
 272
 273         if (expr->type != EXPR_ASSIGNMENT)
 274                 return;
 275         call = strip_expr(expr->right);
 276
 277         if (!parse_call_math_rl(call, math, &rl))
 278                 return;
 279         rl = cast_rl(&int_ctype, rl);
 280         set_state_expr(my_size_id, expr->left, alloc_estate_rl(rl));
 281 }
 282
 283 static int get_real_array_size_from_type(struct symbol *type)
 284 {
 285         sval_t sval;
 286
 287         if (!type)
 288                 return 0;
 289         if (!type || type->type != SYM_ARRAY)
 290                 return 0;
 291
 292         if (!get_implied_value(type->array_size, &sval))
 293                 return 0;
 294
 295         /* People put one element arrays on the end of structs */
 296         if (sval.value == 1)
 297                 return 0;
 298
 299         return sval.value;
 300 }
 301
 302 int get_real_array_size(struct expression *expr)
 303 {
 304         if (!expr)
 305                 return 0;
 306         if (expr->type == EXPR_PREOP && expr->op == '&')
 307                 expr = expr->unop;
 308         if (expr->type == EXPR_BINOP) /* array elements foo[5] */
 309                 return 0;
 310         return get_real_array_size_from_type(get_type(expr));
 311 }
 312
 313 static int get_size_from_initializer(struct expression *expr)
 314 {
 315         if (expr->type != EXPR_SYMBOL || !expr->symbol || !expr->symbol->initializer)
 316                 return 0;
 317         if (expr->symbol->initializer == expr) /* int a = a; */
 318                 return 0;
 319         return get_initializer_size(expr->symbol->initializer);
 320 }
 321
 322 static struct range_list *get_stored_size_bytes(struct expression *expr)
 323 {
 324         struct smatch_state *state;
 325
 326         state = get_state_expr(my_size_id, expr);
 327         if (!state)
 328                 return NULL;
 329         return estate_rl(state);
 330 }
 331
 332 static int get_bytes_from_address(struct expression *expr)
 333 {
 334         struct symbol *type;
 335         int ret;
 336
 337         if (!option_spammy)
 338                 return 0;
 339         if (expr->type != EXPR_PREOP || expr->op != '&')
 340                 return 0;
 341         type = get_type(expr);
 342         if (!type)
 343                 return 0;
 344
 345         if (type->type == SYM_PTR)
 346                 type = get_base_type(type);
 347
 348         ret = type_bytes(type);
 349         if (ret == 1)
 350                 return 0;  /* ignore char pointers */
 351
 352         return ret;
 353 }
 354
 355 static struct expression *remove_addr_fluff(struct expression *expr)
 356 {
 357         struct expression *tmp;
 358         sval_t sval;
 359
 360         expr = strip_expr(expr);
 361
 362         /* remove '&' and '*' operations that cancel */
 363         while (expr && expr->type == EXPR_PREOP && expr->op == '&') {
 364                 tmp = strip_expr(expr->unop);
 365                 if (tmp->type != EXPR_PREOP)
 366                         break;
 367                 if (tmp->op != '*')
 368                         break;
 369                 expr = strip_expr(tmp->unop);
 370         }
 371
 372         if (!expr)
 373                 return NULL;
 374
 375         /* "foo + 0" is just "foo" */
 376         if (expr->type == EXPR_BINOP && expr->op == '+' &&
 377             get_value(expr->right, &sval) && sval.value == 0)
 378                 return expr->left;
 379
 380         return expr;
 381 }
 382
 383 static int is_last_member_of_struct(struct symbol *sym, struct ident *member)
 384 {
 385         struct symbol *tmp;
 386         int i;
 387
 388         i = 0;
 389         FOR_EACH_PTR_REVERSE(sym->symbol_list, tmp) {
 390                 if (i++ || !tmp->ident)
 391                         return 0;
 392                 if (tmp->ident == member)
 393                         return 1;
 394                 return 0;
 395         } END_FOR_EACH_PTR_REVERSE(tmp);
 396
 397         return 0;
 398 }
 399
 400 int last_member_is_resizable(struct symbol *sym)
 401 {
 402         struct symbol *last_member;
 403         struct symbol *type;
 404         sval_t sval;
 405
 406         if (!sym || sym->type != SYM_STRUCT)
 407                 return 0;
 408
 409         last_member = last_ptr_list((struct ptr_list *)sym->symbol_list);
 410         if (!last_member || !last_member->ident)
 411                 return 0;
 412
 413         type = get_real_base_type(last_member);
 414         if (type->type == SYM_STRUCT)
 415                 return last_member_is_resizable(type);
 416         if (type->type != SYM_ARRAY)
 417                 return 0;
 418
 419         if (!get_implied_value(type->array_size, &sval))
 420                 return 0;
 421
 422         if (sval.value != 0 && sval.value != 1)
 423                 return 0;
 424
 425         return 1;
 426 }
 427
 428 static int get_stored_size_end_struct_bytes(struct expression *expr)
 429 {
 430         struct symbol *sym;
 431         struct symbol *base_sym;
 432         struct smatch_state *state;
 433
 434         if (expr->type == EXPR_BINOP) /* array elements foo[5] */
 435                 return 0;
 436
 437         if (expr->type == EXPR_PREOP && expr->op == '&')
 438                 expr = strip_parens(expr->unop);
 439
 440         sym = expr_to_sym(expr);
 441         if (!sym || !sym->ident)
 442                 return 0;
 443         if (!type_bytes(sym))
 444                 return 0;
 445         if (sym->type != SYM_NODE)
 446                 return 0;
 447
 448         base_sym = get_real_base_type(sym);
 449         if (!base_sym || base_sym->type != SYM_PTR)
 450                 return 0;
 451         base_sym = get_real_base_type(base_sym);
 452         if (!base_sym || base_sym->type != SYM_STRUCT)
 453                 return 0;
 454
 455         if (!is_last_member_of_struct(base_sym, expr->member))
 456                 return 0;
 457         if (!last_member_is_resizable(base_sym))
 458                 return 0;
 459
 460         state = get_state(my_size_id, sym->ident->name, sym);
 461         if (!estate_to_size(state))
 462                 return 0;
 463
 464         return estate_to_size(state) - type_bytes(base_sym) + type_bytes(get_type(expr));
 465 }
 466
 467 static struct range_list *alloc_int_rl(int value)
 468 {
 469         sval_t sval = {
 470                 .type = &int_ctype,
 471                 {.value = value},
 472         };
 473
 474         return alloc_rl(sval, sval);
 475 }
 476
 477 struct range_list *get_array_size_bytes_rl(struct expression *expr)
 478 {
 479         struct range_list *ret = NULL;
 480         int size;
 481
 482         expr = remove_addr_fluff(expr);
 483         if (!expr)
 484                 return NULL;
 485
 486         /* "BAR" */
 487         if (expr->type == EXPR_STRING)
 488                 return alloc_int_rl(expr->string->length);
 489
 490         if (expr->type == EXPR_BINOP && expr->op == '+') {
 491                 sval_t offset;
 492                 struct symbol *type;
 493                 int bytes;
 494
 495                 if (!get_implied_value(expr->right, &offset))
 496                         return NULL;
 497                 type = get_type(expr->left);
 498                 if (!type)
 499                         return NULL;
 500                 if (type->type != SYM_ARRAY && type->type != SYM_PTR)
 501                         return NULL;
 502                 type = get_real_base_type(type);
 503                 bytes = type_bytes(type);
 504                 if (bytes == 0)
 505                         return NULL;
 506                 offset.value *= bytes;
 507                 size = get_array_size_bytes(expr->left);
 508                 if (size <= 0)
 509                         return NULL;
 510                 return alloc_int_rl(size - offset.value);
 511         }
 512
 513         /* buf[4] */
 514         size = get_real_array_size(expr);
 515         if (size)
 516                 return alloc_int_rl(elements_to_bytes(expr, size));
 517
 518         /* buf = malloc(1024); */
 519         ret = get_stored_size_bytes(expr);
 520         if (ret)
 521                 return ret;
 522
 523         size = get_stored_size_end_struct_bytes(expr);
 524         if (size)
 525                 return alloc_int_rl(size);
 526
 527         /* char *foo = "BAR" */
 528         size = get_size_from_initializer(expr);
 529         if (size)
 530                 return alloc_int_rl(elements_to_bytes(expr, size));
 531
 532         size = get_bytes_from_address(expr);
 533         if (size)
 534                 return alloc_int_rl(size);
 535
 536         ret = size_from_db(expr);
 537         if (ret)
 538                 return ret;
 539
 540         return NULL;
 541 }
 542
 543 int get_array_size_bytes(struct expression *expr)
 544 {
 545         struct range_list *rl;
 546         sval_t sval;
 547
 548         rl = get_array_size_bytes_rl(expr);
 549         if (!rl_to_sval(rl, &sval))
 550                 return 0;
 551         if (sval.uvalue >= INT_MAX)
 552                 return 0;
 553         return sval.value;
 554 }
 555
 556 int get_array_size_bytes_max(struct expression *expr)
 557 {
 558         struct range_list *rl;
 559         sval_t bytes;
 560
 561         rl = get_array_size_bytes_rl(expr);
 562         if (!rl)
 563                 return 0;
 564         bytes = rl_min(rl);
 565         if (bytes.value < 0)
 566                 return 0;
 567         bytes = rl_max(rl);
 568         if (bytes.uvalue >= INT_MAX)
 569                 return 0;
 570         return bytes.value;
 571 }
 572
 573 int get_array_size_bytes_min(struct expression *expr)
 574 {
 575         struct range_list *rl;
 576         struct data_range *range;
 577
 578         rl = get_array_size_bytes_rl(expr);
 579         if (!rl)
 580                 return 0;
 581
 582         FOR_EACH_PTR(rl, range) {
 583                 if (range->min.value <= 0)
 584                         return 0;
 585                 if (range->max.value <= 0)
 586                         return 0;
 587                 if (range->min.uvalue >= INT_MAX)
 588                         return 0;
 589                 return range->min.value;
 590         } END_FOR_EACH_PTR(range);
 591
 592         return 0;
 593 }
 594
 595 int get_array_size(struct expression *expr)
 596 {
 597         if (!expr)
 598                 return 0;
 599         return bytes_to_elements(expr, get_array_size_bytes_max(expr));
 600 }
 601
 602 static struct expression *strip_ampersands(struct expression *expr)
 603 {
 604         struct symbol *type;
 605
 606         if (expr->type != EXPR_PREOP)
 607                 return expr;
 608         if (expr->op != '&')
 609                 return expr;
 610         type = get_type(expr->unop);
 611         if (!type || type->type != SYM_ARRAY)
 612                 return expr;
 613         return expr->unop;
 614 }
 615
 616 static void info_record_alloction(struct expression *buffer, struct range_list *rl)
 617 {
 618         char *name;
 619
 620         if (!option_info)
 621                 return;
 622
 623         name = get_member_name(buffer);
 624         if (!name && is_static(buffer))
 625                 name = expr_to_var(buffer);
 626         if (!name)
 627                 return;
 628         if (rl && !is_whole_rl(rl))
 629                 sql_insert_function_type_size(name, show_rl(rl));
 630         else
 631                 sql_insert_function_type_size(name, "(-1)");
 632
 633         free_string(name);
 634 }
 635
 636 static void store_alloc(struct expression *expr, struct range_list *rl)
 637 {
 638         struct symbol *type;
 639
 640         rl = clone_rl(rl); // FIXME!!!
 641         set_state_expr(my_size_id, expr, alloc_estate_rl(rl));
 642
 643         type = get_type(expr);
 644         if (!type)
 645                 return;
 646         if (type->type != SYM_PTR)
 647                 return;
 648         type = get_real_base_type(type);
 649         if (!type)
 650                 return;
 651         if (type == &void_ctype)
 652                 return;
 653         if (type->type != SYM_BASETYPE && type->type != SYM_PTR)
 654                 return;
 655
 656         info_record_alloction(expr, rl);
 657 }
 658
 659 static void match_array_assignment(struct expression *expr)
 660 {
 661         struct expression *left;
 662         struct expression *right;
 663         char *left_member, *right_member;
 664         struct range_list *rl;
 665         sval_t sval;
 666
 667         if (expr->op != '=')
 668                 return;
 669         left = strip_expr(expr->left);
 670         right = strip_expr(expr->right);
 671         right = strip_ampersands(right);
 672
 673         if (!is_pointer(left))
 674                 return;
 675         if (is_allocation_function(right))
 676                 return;
 677
 678         left_member = get_member_name(left);
 679         right_member = get_member_name(right);
 680         if (left_member && right_member && strcmp(left_member, right_member) == 0) {
 681                 free_string(left_member);
 682                 free_string(right_member);
 683                 return;
 684         }
 685         free_string(left_member);
 686         free_string(right_member);
 687
 688         if (get_implied_value(right, &sval) && sval.value == 0) {
 689                 rl = alloc_int_rl(0);
 690                 goto store;
 691         }
 692
 693         rl = get_array_size_bytes_rl(right);
 694
 695 store:
 696         store_alloc(left, rl);
 697 }
 698
 699 static void match_alloc(const char *fn, struct expression *expr, void *_size_arg)
 700 {
 701         int size_arg = PTR_INT(_size_arg);
 702         struct expression *right;
 703         struct expression *arg;
 704         struct range_list *rl;
 705
 706         right = strip_expr(expr->right);
 707         arg = get_argument_from_call_expr(right->args, size_arg);
 708         get_absolute_rl(arg, &rl);
 709         rl = cast_rl(&int_ctype, rl);
 710         store_alloc(expr->left, rl);
 711 }
 712
 713 static void match_calloc(const char *fn, struct expression *expr, void *unused)
 714 {
 715         struct expression *right;
 716         struct expression *arg;
 717         sval_t elements;
 718         sval_t size;
 719
 720         right = strip_expr(expr->right);
 721         arg = get_argument_from_call_expr(right->args, 0);
 722         if (!get_implied_value(arg, &elements))
 723                 return; // FIXME!!!
 724         arg = get_argument_from_call_expr(right->args, 1);
 725         if (get_implied_value(arg, &size))
 726                 store_alloc(expr->left, size_to_rl(elements.value * size.value));
 727         else
 728                 store_alloc(expr->left, size_to_rl(-1));
 729 }
 730
 731 static void match_page(const char *fn, struct expression *expr, void *_unused)
 732 {
 733         sval_t page_size = {
 734                 .type = &int_ctype,
 735                 {.value = 4096},
 736         };
 737
 738         store_alloc(expr->left, alloc_rl(page_size, page_size));
 739 }
 740
 741 static void match_strndup(const char *fn, struct expression *expr, void *unused)
 742 {
 743         struct expression *fn_expr;
 744         struct expression *size_expr;
 745         sval_t size;
 746
 747         fn_expr = strip_expr(expr->right);
 748         size_expr = get_argument_from_call_expr(fn_expr->args, 1);
 749         if (get_implied_max(size_expr, &size)) {
 750                 size.value++;
 751                 store_alloc(expr->left, size_to_rl(size.value));
 752         } else {
 753                 store_alloc(expr->left, size_to_rl(-1));
 754         }
 755
 756 }
 757
 758 static void match_alloc_pages(const char *fn, struct expression *expr, void *_order_arg)
 759 {
 760         int order_arg = PTR_INT(_order_arg);
 761         struct expression *right;
 762         struct expression *arg;
 763         sval_t sval;
 764
 765         right = strip_expr(expr->right);
 766         arg = get_argument_from_call_expr(right->args, order_arg);
 767         if (!get_implied_value(arg, &sval))
 768                 return;
 769         if (sval.value < 0 || sval.value > 10)
 770                 return;
 771
 772         sval.type = &int_ctype;
 773         sval.value = 1 << sval.value;
 774         sval.value *= 4096;
 775
 776         store_alloc(expr->left, alloc_rl(sval, sval));
 777 }
 778
 779 static int is_type_bytes(struct range_list *rl, struct expression *arg)
 780 {
 781         struct symbol *type;
 782         sval_t sval;
 783
 784         if (!rl_to_sval(rl, &sval))
 785                 return 0;
 786
 787         type = get_type(arg);
 788         if (!type)
 789                 return 0;
 790         if (type->type != SYM_PTR)
 791                 return 0;
 792         type = get_real_base_type(type);
 793         if (type->type != SYM_STRUCT &&
 794             type->type != SYM_UNION)
 795                 return 0;
 796         if (sval.value != type_bytes(type))
 797                 return 0;
 798         return 1;
 799 }
 800
 801 static void match_call(struct expression *expr)
 802 {
 803         struct expression *arg;
 804         struct symbol *type;
 805         struct range_list *rl;
 806         int i;
 807
 808         i = -1;
 809         FOR_EACH_PTR(expr->args, arg) {
 810                 i++;
 811                 type = get_type(arg);
 812                 if (!type || (type->type != SYM_PTR && type->type != SYM_ARRAY))
 813                         continue;
 814                 rl = get_array_size_bytes_rl(arg);
 815                 if (!rl)
 816                         continue;
 817                 if (is_whole_rl(rl))
 818                         continue;
 819                 if (is_type_bytes(rl, arg))
 820                         continue;
 821                 sql_insert_caller_info(expr, BUF_SIZE, i, "$", show_rl(rl));
 822         } END_FOR_EACH_PTR(arg);
 823 }
 824
 825 static void struct_member_callback(struct expression *call, int param, char *printed_name, struct sm_state *sm)
 826 {
 827         if (sm->state == &merged ||
 828             strcmp(sm->state->name, "(-1)") == 0 ||
 829             strcmp(sm->state->name, "empty") == 0 ||
 830             strcmp(sm->state->name, "0") == 0)
 831                 return;
 832         sql_insert_caller_info(call, BUF_SIZE, param, printed_name, sm->state->name);
 833 }
 834
 835 /*
 836  * This is slightly (very) weird because half of this stuff is handled in
 837  * smatch_parse_call_math.c which is poorly named.  But anyway, add some buf
 838  * sizes here.
 839  *
 840  */
 841 static void print_returned_allocations(int return_id, char *return_ranges, struct expression *expr)
 842 {
 843         char buf[16];
 844         int size;
 845
 846         size = get_array_size_bytes(expr);
 847         if (!size)
 848                 return;
 849
 850         snprintf(buf, sizeof(buf), "%d", size);
 851         sql_insert_return_states(return_id, return_ranges, BUF_SIZE, -1, "", buf);
 852 }
 853
 854 static void record_global_size(struct symbol *sym)
 855 {
 856         struct symbol *type;
 857         int elements, bpe, bytes;
 858         char buf[16];
 859
 860         if (!sym->ident)
 861                 return;
 862
 863         if (!(sym->ctype.modifiers & MOD_TOPLEVEL) ||
 864             sym->ctype.modifiers & MOD_STATIC)
 865                 return;
 866
 867         type = get_real_base_type(sym);
 868         elements = get_real_array_size_from_type(type);
 869         if (elements <= 0)
 870                 return;
 871         type = get_real_base_type(type);
 872         bpe = type_bytes(type);
 873         bytes = elements * bpe;
 874         snprintf(buf, sizeof(buf), "%d", bytes);
 875         sql_insert_data_info_var_sym(sym->ident->name, sym, BUF_SIZE, buf);
 876 }
 877
 878 void register_buf_size(int id)
 879 {
 880         my_size_id = id;
 881
 882         add_unmatched_state_hook(my_size_id, &unmatched_size_state);
 883
 884         select_caller_info_hook(set_param_buf_size, BUF_SIZE);
 885         select_return_states_hook(BUF_SIZE, &db_returns_buf_size);
 886         add_split_return_callback(print_returned_allocations);
 887
 888         allocation_funcs = create_function_hashtable(100);
 889         add_allocation_function("malloc", &match_alloc, 0);
 890         add_allocation_function("calloc", &match_calloc, 0);
 891         add_allocation_function("memdup", &match_alloc, 1);
 892         add_allocation_function("realloc", &match_alloc, 1);
 893         if (option_project == PROJ_KERNEL) {
 894                 add_allocation_function("kmalloc", &match_alloc, 0);
 895                 add_allocation_function("kmalloc_node", &match_alloc, 0);
 896                 add_allocation_function("kzalloc", &match_alloc, 0);
 897                 add_allocation_function("kzalloc_node", &match_alloc, 0);
 898                 add_allocation_function("vmalloc", &match_alloc, 0);
 899                 add_allocation_function("__vmalloc", &match_alloc, 0);
 900                 add_allocation_function("kcalloc", &match_calloc, 0);
 901                 add_allocation_function("kmalloc_array", &match_calloc, 0);
 902                 add_allocation_function("drm_malloc_ab", &match_calloc, 0);
 903                 add_allocation_function("drm_calloc_large", &match_calloc, 0);
 904                 add_allocation_function("sock_kmalloc", &match_alloc, 1);
 905                 add_allocation_function("kmemdup", &match_alloc, 1);
 906                 add_allocation_function("kmemdup_user", &match_alloc, 1);
 907                 add_allocation_function("dma_alloc_attrs", &match_alloc, 1);
 908                 add_allocation_function("pci_alloc_consistent", &match_alloc, 1);
 909                 add_allocation_function("pci_alloc_coherent", &match_alloc, 1);
 910                 add_allocation_function("devm_kmalloc", &match_alloc, 1);
 911                 add_allocation_function("devm_kzalloc", &match_alloc, 1);
 912                 add_allocation_function("krealloc", &match_alloc, 1);
 913                 add_allocation_function("__alloc_bootmem", &match_alloc, 0);
 914                 add_allocation_function("alloc_bootmem", &match_alloc, 0);
 915                 add_allocation_function("kmap", &match_page, 0);
 916                 add_allocation_function("get_zeroed_page", &match_page, 0);
 917                 add_allocation_function("alloc_pages", &match_alloc_pages, 1);
 918                 add_allocation_function("alloc_pages_current", &match_alloc_pages, 1);
 919                 add_allocation_function("__get_free_pages", &match_alloc_pages, 1);
 920         }
 921
 922         add_allocation_function("strndup", match_strndup, 0);
 923         if (option_project == PROJ_KERNEL)
 924                 add_allocation_function("kstrndup", match_strndup, 0);
 925
 926         add_modification_hook(my_size_id, &set_size_undefined);
 927
 928         add_merge_hook(my_size_id, &merge_size_func);
 929
 930         if (option_info)
 931                 add_hook(record_global_size, BASE_HOOK);
 932 }
 933
 934 void register_buf_size_late(int id)
 935 {
 936         /* has to happen after match_alloc() */
 937         add_hook(&match_array_assignment, ASSIGNMENT_HOOK);
 938
 939         add_hook(&match_call, FUNCTION_CALL_HOOK);
 940         add_member_info_callback(my_size_id, struct_member_callback);
 941 }