check_user_data2.c

   1 /*
   2  * Copyright (C) 2011 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 /*
  19  * There are a couple checks that try to see if a variable
  20  * comes from the user.  It would be better to unify them
  21  * into one place.  Also it we should follow the data down
  22  * the call paths.  Hence this file.
  23  */
  24
  25 #include "smatch.h"
  26 #include "smatch_slist.h"
  27 #include "smatch_extra.h"
  28
  29 static int my_id;
  30 static int my_call_id;
  31
  32 STATE(called);
  33
  34 static const char * kstr_funcs[] = {
  35         "kstrtoull", "kstrtoll", "kstrtoul", "kstrtol", "kstrtouint",
  36         "kstrtoint", "kstrtou64", "kstrtos64", "kstrtou32", "kstrtos32",
  37         "kstrtou16", "kstrtos16", "kstrtou8", "kstrtos8", "kstrtoull_from_user"
  38         "kstrtoll_from_user", "kstrtoul_from_user", "kstrtol_from_user",
  39         "kstrtouint_from_user", "kstrtoint_from_user", "kstrtou16_from_user",
  40         "kstrtos16_from_user", "kstrtou8_from_user", "kstrtos8_from_user",
  41         "kstrtou64_from_user", "kstrtos64_from_user", "kstrtou32_from_user",
  42         "kstrtos32_from_user",
  43 };
  44
  45 static void set_points_to_user_data(struct expression *expr);
  46
  47 static struct stree *start_states;
  48 static struct stree_stack *saved_stack;
  49 static void save_start_states(struct statement *stmt)
  50 {
  51         start_states = clone_stree(__get_cur_stree());
  52 }
  53
  54 static void free_start_states(void)
  55 {
  56         free_stree(&start_states);
  57 }
  58
  59 static void match_save_states(struct expression *expr)
  60 {
  61         push_stree(&saved_stack, start_states);
  62         start_states = NULL;
  63 }
  64
  65 static void match_restore_states(struct expression *expr)
  66 {
  67         free_stree(&start_states);
  68         start_states = pop_stree(&saved_stack);
  69 }
  70
  71 static struct smatch_state *empty_state(struct sm_state *sm)
  72 {
  73         return alloc_estate_empty();
  74 }
  75
  76 static void pre_merge_hook(struct sm_state *sm)
  77 {
  78         struct smatch_state *user;
  79         struct smatch_state *extra;
  80         struct range_list *rl;
  81
  82         extra = get_state(SMATCH_EXTRA, sm->name, sm->sym);
  83         if (!extra || !estate_rl(extra))
  84                 return;
  85         user = get_state(my_id, sm->name, sm->sym);
  86         if (!user || !estate_rl(user))
  87                 return;
  88         rl = rl_intersection(estate_rl(user), estate_rl(extra));
  89         set_state(my_id, sm->name, sm->sym, alloc_estate_rl(clone_rl(rl)));
  90 }
  91
  92 static void tag_inner_struct_members(struct expression *expr, struct symbol *member)
  93 {
  94         struct expression *edge_member;
  95         struct symbol *base = get_real_base_type(member);
  96         struct symbol *tmp;
  97
  98         if (member->ident)
  99                 expr = member_expression(expr, '.', member->ident);
 100
 101         FOR_EACH_PTR(base->symbol_list, tmp) {
 102                 struct symbol *type;
 103
 104                 type = get_real_base_type(tmp);
 105                 if (!type)
 106                         continue;
 107
 108                 if (type->type == SYM_UNION || type->type == SYM_STRUCT) {
 109                         tag_inner_struct_members(expr, tmp);
 110                         continue;
 111                 }
 112
 113                 if (!tmp->ident)
 114                         continue;
 115
 116                 edge_member = member_expression(expr, '.', tmp->ident);
 117                 set_state_expr(my_id, edge_member, alloc_estate_whole(type));
 118         } END_FOR_EACH_PTR(tmp);
 119 }
 120
 121 static void tag_struct_members(struct symbol *type, struct expression *expr)
 122 {
 123         struct symbol *tmp;
 124         struct expression *member;
 125         int op = '*';
 126
 127         if (expr->type == EXPR_PREOP && expr->op == '&') {
 128                 expr = strip_expr(expr->unop);
 129                 op = '.';
 130         }
 131
 132         FOR_EACH_PTR(type->symbol_list, tmp) {
 133                 type = get_real_base_type(tmp);
 134                 if (!type)
 135                         continue;
 136
 137                 if (type->type == SYM_UNION || type->type == SYM_STRUCT) {
 138                         tag_inner_struct_members(expr, tmp);
 139                         continue;
 140                 }
 141
 142                 if (!tmp->ident)
 143                         continue;
 144
 145                 member = member_expression(expr, op, tmp->ident);
 146                 set_state_expr(my_id, member, alloc_estate_whole(get_type(member)));
 147
 148                 if (type->type == SYM_ARRAY)
 149                         set_points_to_user_data(member);
 150         } END_FOR_EACH_PTR(tmp);
 151 }
 152
 153 static void tag_base_type(struct expression *expr)
 154 {
 155         if (expr->type == EXPR_PREOP && expr->op == '&')
 156                 expr = strip_expr(expr->unop);
 157         else
 158                 expr = deref_expression(expr);
 159         set_state_expr(my_id, expr, alloc_estate_whole(get_type(expr)));
 160 }
 161
 162 static void tag_as_user_data(struct expression *expr)
 163 {
 164         struct symbol *type;
 165
 166         expr = strip_expr(expr);
 167
 168         type = get_type(expr);
 169         if (!type || type->type != SYM_PTR)
 170                 return;
 171         type = get_real_base_type(type);
 172         if (!type)
 173                 return;
 174         if (type == &void_ctype) {
 175                 set_state_expr(my_id, deref_expression(expr), alloc_estate_whole(&ulong_ctype));
 176                 return;
 177         }
 178         if (type->type == SYM_BASETYPE)
 179                 tag_base_type(expr);
 180         if (type->type == SYM_STRUCT) {
 181                 if (expr->type != EXPR_PREOP || expr->op != '&')
 182                         expr = deref_expression(expr);
 183                 else
 184                         set_state_expr(my_id, deref_expression(expr), alloc_estate_whole(&ulong_ctype));
 185                 tag_struct_members(type, expr);
 186         }
 187 }
 188
 189 static void match_user_copy(const char *fn, struct expression *expr, void *_param)
 190 {
 191         int param = PTR_INT(_param);
 192         struct expression *dest;
 193
 194         dest = get_argument_from_call_expr(expr->args, param);
 195         dest = strip_expr(dest);
 196         if (!dest)
 197                 return;
 198         tag_as_user_data(dest);
 199 }
 200
 201 static void match_sscanf(const char *fn, struct expression *expr, void *unused)
 202 {
 203         struct expression *arg;
 204         int i;
 205
 206         i = -1;
 207         FOR_EACH_PTR(expr->args, arg) {
 208                 i++;
 209                 if (i < 2)
 210                         continue;
 211                 tag_as_user_data(arg);
 212         } END_FOR_EACH_PTR(arg);
 213 }
 214
 215 static int points_to_user_data(struct expression *expr)
 216 {
 217         struct smatch_state *state;
 218         char buf[256];
 219         struct symbol *sym;
 220         char *name;
 221         int ret = 0;
 222
 223         expr = strip_expr(expr);
 224
 225         if (expr->type == EXPR_BINOP && expr->op == '+') {
 226                 if (points_to_user_data(expr->left))
 227                         return 1;
 228                 if (points_to_user_data(expr->right))
 229                         return 1;
 230                 return 0;
 231         }
 232
 233         name = expr_to_var_sym(expr, &sym);
 234         if (!name || !sym)
 235                 goto free;
 236         snprintf(buf, sizeof(buf), "*%s", name);
 237         state = get_state(my_id, buf, sym);
 238         if (state && estate_rl(state))
 239                 ret = 1;
 240 free:
 241         free_string(name);
 242         return ret;
 243 }
 244
 245 static void set_points_to_user_data(struct expression *expr)
 246 {
 247         char *name;
 248         struct symbol *sym;
 249         char buf[256];
 250
 251         name = expr_to_var_sym(expr, &sym);
 252         if (!name || !sym)
 253                 goto free;
 254         snprintf(buf, sizeof(buf), "*%s", name);
 255         set_state(my_id, buf, sym, alloc_estate_whole(&llong_ctype));
 256 free:
 257         free_string(name);
 258 }
 259
 260 static int is_skb_data(struct expression *expr)
 261 {
 262         struct symbol *sym;
 263
 264         expr = strip_expr(expr);
 265         if (!expr || expr->type != EXPR_PREOP || expr->op != '*')
 266                 return 0;
 267
 268         expr = strip_expr(expr->unop);
 269         if (expr->type == EXPR_BINOP && expr->op == '+')
 270                 expr = strip_expr(expr->left);
 271
 272         if (expr->type != EXPR_DEREF)
 273                 return 0;
 274
 275         if (!expr->member)
 276                 return 0;
 277         if (strcmp(expr->member->name, "data") != 0)
 278                 return 0;
 279
 280         sym = expr_to_sym(expr->deref);
 281         if (!sym)
 282                 return 0;
 283         sym = get_real_base_type(sym);
 284         if (!sym || sym->type != SYM_PTR)
 285                 return 0;
 286         sym = get_real_base_type(sym);
 287         if (!sym || sym->type != SYM_STRUCT || !sym->ident)
 288                 return 0;
 289         if (strcmp(sym->ident->name, "sk_buff") != 0)
 290                 return 0;
 291
 292         return 1;
 293 }
 294
 295 static int comes_from_skb_data(struct expression *expr)
 296 {
 297         expr = strip_expr(expr);
 298         if (!expr)
 299                 return 0;
 300
 301         switch (expr->type) {
 302         case EXPR_BINOP:
 303                 if (comes_from_skb_data(expr->left))
 304                         return 1;
 305                 if (comes_from_skb_data(expr->right))
 306                         return 1;
 307                 return 0;
 308         case EXPR_PREOP:
 309                 if (is_skb_data(expr))
 310                         return 1;
 311                 return comes_from_skb_data(expr->deref);
 312         default:
 313                 return 0;
 314         }
 315 }
 316
 317
 318 static int handle_struct_assignment(struct expression *expr)
 319 {
 320         struct expression *right;
 321         struct symbol *left_type, *right_type;
 322
 323         left_type = get_type(expr->left);
 324         if (!left_type || left_type->type != SYM_PTR)
 325                 return 0;
 326         left_type = get_real_base_type(left_type);
 327         if (!left_type || left_type->type != SYM_STRUCT)
 328                 return 0;
 329
 330         /*
 331          * Ignore struct to struct assignments because for those we look at the
 332          * individual members.
 333          */
 334         right = strip_expr(expr->right);
 335         right_type = get_type(right);
 336         if (!right_type || right_type->type != SYM_PTR)
 337                 return 0;
 338
 339         /* If we are assigning struct members then normally that is handled
 340          * by fake assignments, however if we cast one struct to a different
 341          * of struct then we handle that here.
 342          */
 343         right_type = get_real_base_type(right_type);
 344         if (right_type == left_type)
 345                 return 0;
 346
 347         if (!points_to_user_data(right) && !is_skb_data(right))
 348                 return 0;
 349
 350         tag_as_user_data(expr->left);
 351         return 1;
 352 }
 353
 354 static int handle_get_user(struct expression *expr)
 355 {
 356         char *name;
 357         int ret = 0;
 358
 359         name = get_macro_name(expr->pos);
 360         if (!name || strcmp(name, "get_user") != 0)
 361                 return 0;
 362
 363         name = expr_to_var(expr->right);
 364         if (!name || strcmp(name, "__val_gu") != 0)
 365                 goto free;
 366         set_state_expr(my_id, expr->left, alloc_estate_whole(get_type(expr->left)));
 367         ret = 1;
 368 free:
 369         free_string(name);
 370         return ret;
 371 }
 372
 373 static void match_assign(struct expression *expr)
 374 {
 375         struct range_list *rl;
 376
 377         if (is_fake_call(expr->right))
 378                 return;
 379         if (handle_get_user(expr))
 380                 return;
 381         if (points_to_user_data(expr->right))
 382                 set_points_to_user_data(expr->left);
 383         if (handle_struct_assignment(expr))
 384                 return;
 385
 386         if (!get_user_rl(expr->right, &rl))
 387                 goto clear_old_state;
 388
 389         rl = cast_rl(get_type(expr->left), rl);
 390         set_state_expr(my_id, expr->left, alloc_estate_rl(rl));
 391
 392         return;
 393
 394 clear_old_state:
 395         if (get_state_expr(my_id, expr->left))
 396                 set_state_expr(my_id, expr->left, alloc_estate_empty());
 397 }
 398
 399 static void match_user_assign_function(const char *fn, struct expression *expr, void *unused)
 400 {
 401         tag_as_user_data(expr->left);
 402         set_points_to_user_data(expr->left);
 403 }
 404
 405 static void match_simple_strtoul(const char *fn, struct expression *expr, void *unused)
 406 {
 407         set_state_expr(my_id, expr->left, alloc_estate_whole(get_type(expr->left)));
 408 }
 409
 410 static int get_user_macro_rl(struct expression *expr, struct range_list **rl)
 411 {
 412         char *macro;
 413
 414         if (!expr)
 415                 return 0;
 416         macro = get_macro_name(expr->pos);
 417
 418         if (!macro)
 419                 return 0;
 420
 421         if (strcmp(macro, "ntohl") == 0) {
 422                 *rl = alloc_whole_rl(&uint_ctype);
 423                 return 1;
 424         }
 425         if (strcmp(macro, "ntohs") == 0) {
 426                 *rl = alloc_whole_rl(&ushort_ctype);
 427                 return 1;
 428         }
 429         return 0;
 430 }
 431
 432 struct db_info {
 433         struct range_list *rl;
 434         struct expression *call;
 435 };
 436 static int returned_rl_callback(void *_info, int argc, char **argv, char **azColName)
 437 {
 438         struct db_info *db_info = _info;
 439         struct range_list *rl;
 440
 441         if (argc != 1)
 442                 return 0;
 443
 444         call_results_to_rl(db_info->call, get_type(db_info->call), argv[0], &rl);
 445         db_info->rl = rl_union(db_info->rl, rl);
 446
 447         return 0;
 448 }
 449
 450 static int db_returned_user_rl(struct expression *call, struct range_list **rl)
 451 {
 452         struct db_info db_info = {};
 453
 454         /* for function pointers assume everything is used */
 455         if (call->fn->type != EXPR_SYMBOL)
 456                 return 0;
 457         if (is_fake_call(call))
 458                 return 0;
 459
 460         db_info.call = call;
 461         run_sql(&returned_rl_callback, &db_info,
 462                 "select value from return_states where %s and type = %d and parameter = -1 and key = '$';",
 463                 get_static_filter(call->fn->symbol), USER_DATA3);
 464         if (!db_info.rl)
 465                 return 0;
 466         *rl = db_info.rl;
 467         return 1;
 468 }
 469
 470 static int user_data_flag;
 471 static struct range_list *var_user_rl(struct expression *expr)
 472 {
 473         struct smatch_state *state;
 474         struct range_list *rl;
 475         struct range_list *absolute_rl;
 476
 477         if (get_user_macro_rl(expr, &rl))
 478                 goto found;
 479
 480         if (comes_from_skb_data(expr)) {
 481                 rl = alloc_whole_rl(get_type(expr));
 482                 goto found;
 483         }
 484
 485         state = get_state_expr(my_id, expr);
 486         if (state && estate_rl(state)) {
 487                 rl = estate_rl(state);
 488                 goto found;
 489         }
 490
 491         if (expr->type == EXPR_CALL && db_returned_user_rl(expr, &rl))
 492                 goto found;
 493
 494         return NULL;
 495 found:
 496         user_data_flag = 1;
 497         absolute_rl = var_to_absolute_rl(expr);
 498         return clone_rl(rl_intersection(rl, absolute_rl));
 499 }
 500
 501 int get_user_rl(struct expression *expr, struct range_list **rl)
 502 {
 503
 504         user_data_flag = 0;
 505         custom_get_absolute_rl(expr, &var_user_rl, rl);
 506         if (!user_data_flag) {
 507                 *rl = NULL;
 508                 return 0;
 509         }
 510         return 1;
 511 }
 512
 513 int get_user_rl_var_sym(const char *name, struct symbol *sym, struct range_list **rl)
 514 {
 515         struct smatch_state *state;
 516
 517         state = get_state(my_id, name, sym);
 518         if (state && estate_rl(state)) {
 519                 *rl = estate_rl(state);
 520                 return 1;
 521         }
 522         return 0;
 523 }
 524
 525 static void match_call_info(struct expression *expr)
 526 {
 527         struct range_list *rl;
 528         struct expression *arg;
 529         int i = 0;
 530
 531         i = -1;
 532         FOR_EACH_PTR(expr->args, arg) {
 533                 i++;
 534
 535                 if (!get_user_rl(arg, &rl))
 536                         continue;
 537
 538                 sql_insert_caller_info(expr, USER_DATA3, i, "$", show_rl(rl));
 539         } END_FOR_EACH_PTR(arg);
 540 }
 541
 542 static void struct_member_callback(struct expression *call, int param, char *printed_name, struct sm_state *sm)
 543 {
 544         struct smatch_state *state;
 545         struct range_list *rl;
 546
 547         if (strcmp(sm->state->name, "") == 0)
 548                 return;
 549
 550         state = get_state(SMATCH_EXTRA, sm->name, sm->sym);
 551         if (!state || !estate_rl(state))
 552                 rl = estate_rl(sm->state);
 553         else
 554                 rl = rl_intersection(estate_rl(sm->state), estate_rl(state));
 555
 556         sql_insert_caller_info(call, USER_DATA3, param, printed_name, show_rl(rl));
 557 }
 558
 559 static void set_param_user_data(const char *name, struct symbol *sym, char *key, char *value)
 560 {
 561         struct range_list *rl = NULL;
 562         struct smatch_state *state;
 563         struct symbol *type;
 564         char fullname[256];
 565
 566         if (strcmp(key, "*$") == 0)
 567                 snprintf(fullname, sizeof(fullname), "*%s", name);
 568         else if (strncmp(key, "$", 1) == 0)
 569                 snprintf(fullname, 256, "%s%s", name, key + 1);
 570         else
 571                 return;
 572
 573         type = get_member_type_from_key(symbol_expression(sym), key);
 574
 575         /* if the caller passes a void pointer with user data */
 576         if (strcmp(key, "*$") == 0 && type && type != &void_ctype) {
 577                 struct expression *expr = symbol_expression(sym);
 578
 579                 tag_as_user_data(expr);
 580                 set_points_to_user_data(expr);
 581                 return;
 582         }
 583         str_to_rl(type, value, &rl);
 584         state = alloc_estate_rl(rl);
 585         set_state(my_id, fullname, sym, state);
 586 }
 587
 588 static void set_called(const char *name, struct symbol *sym, char *key, char *value)
 589 {
 590         set_state(my_call_id, "this_function", NULL, &called);
 591 }
 592
 593 static void match_syscall_definition(struct symbol *sym)
 594 {
 595         struct symbol *arg;
 596         char *macro;
 597         char *name;
 598         int is_syscall = 0;
 599
 600         macro = get_macro_name(sym->pos);
 601         if (macro &&
 602             (strncmp("SYSCALL_DEFINE", macro, strlen("SYSCALL_DEFINE")) == 0 ||
 603              strncmp("COMPAT_SYSCALL_DEFINE", macro, strlen("COMPAT_SYSCALL_DEFINE")) == 0))
 604                 is_syscall = 1;
 605
 606         name = get_function();
 607         if (!option_no_db && get_state(my_call_id, "this_function", NULL) != &called) {
 608                 if (name && strncmp(name, "sys_", 4) == 0)
 609                         is_syscall = 1;
 610         }
 611
 612         if (name && strncmp(name, "compat_sys_", 11) == 0)
 613                 is_syscall = 1;
 614
 615         if (!is_syscall)
 616                 return;
 617
 618         FOR_EACH_PTR(sym->ctype.base_type->arguments, arg) {
 619                 set_state(my_id, arg->ident->name, arg, alloc_estate_whole(get_real_base_type(arg)));
 620         } END_FOR_EACH_PTR(arg);
 621 }
 622
 623 static void set_to_user_data(struct expression *expr, char *key, char *value)
 624 {
 625         char *name;
 626         struct symbol *sym;
 627         struct symbol *type;
 628         struct range_list *rl = NULL;
 629
 630         type = get_member_type_from_key(expr, key);
 631         name = get_variable_from_key(expr, key, &sym);
 632         if (!name || !sym)
 633                 goto free;
 634
 635         call_results_to_rl(expr, type, value, &rl);
 636
 637         set_state(my_id, name, sym, alloc_estate_rl(rl));
 638 free:
 639         free_string(name);
 640
 641 }
 642
 643 static void returns_param_user_data(struct expression *expr, int param, char *key, char *value)
 644 {
 645         struct expression *arg;
 646
 647         if (param == -1) {
 648                 set_to_user_data(expr->left, key, value);
 649                 return;
 650         }
 651
 652         while (expr->type == EXPR_ASSIGNMENT)
 653                 expr = strip_expr(expr->right);
 654         if (expr->type != EXPR_CALL)
 655                 return;
 656
 657         arg = get_argument_from_call_expr(expr->args, param);
 658         if (!arg)
 659                 return;
 660         set_to_user_data(arg, key, value);
 661 }
 662
 663 static int has_empty_state(struct sm_state *sm)
 664 {
 665         struct sm_state *tmp;
 666
 667         FOR_EACH_PTR(sm->possible, tmp) {
 668                 if (!estate_rl(tmp->state))
 669                         return 1;
 670         } END_FOR_EACH_PTR(tmp);
 671
 672         return 0;
 673 }
 674
 675 static void param_set_to_user_data(int return_id, char *return_ranges, struct expression *expr)
 676 {
 677         struct sm_state *sm;
 678         struct smatch_state *start_state;
 679         struct range_list *rl;
 680         int param;
 681         const char *param_name;
 682
 683         FOR_EACH_MY_SM(my_id, __get_cur_stree(), sm) {
 684                 if (has_empty_state(sm))
 685                         continue;
 686
 687                 param = get_param_num_from_sym(sm->sym);
 688                 if (param < 0) {
 689                         if (expr_to_sym(expr) == sm->sym)
 690                                 param = -1;
 691                         else
 692                                 continue;
 693                 }
 694
 695                 /* The logic here was that if we were passed in a user data then
 696                  * we don't record that.  It's like the difference between
 697                  * param_filter and param_set.  When I think about it, I'm not
 698                  * sure it actually works.  It's probably harmless because we
 699                  * checked earlier that we're not returning a parameter...
 700                  * Let's mark this as a TODO.
 701                  */
 702                 start_state = get_state_stree(start_states, my_id, sm->name, sm->sym);
 703                 if (start_state && estates_equiv(sm->state, start_state))
 704                         continue;
 705
 706                 param_name = get_param_name(sm);
 707                 if (!param_name)
 708                         continue;
 709                 if (strcmp(param_name, "$") == 0)
 710                         continue;
 711
 712                 sql_insert_return_states(return_id, return_ranges, USER_DATA3,
 713                                          param, param_name, show_rl(estate_rl(sm->state)));
 714         } END_FOR_EACH_SM(sm);
 715
 716         if (get_user_rl(expr, &rl)) {
 717                 sql_insert_return_states(return_id, return_ranges, USER_DATA3,
 718                                          -1, "$", show_rl(rl));
 719         }
 720 }
 721
 722 void check_user_data2(int id)
 723 {
 724         int i;
 725
 726         my_id = id;
 727
 728         if (option_project != PROJ_KERNEL)
 729                 return;
 730
 731         add_hook(&save_start_states, AFTER_DEF_HOOK);
 732         add_hook(&free_start_states, AFTER_FUNC_HOOK);
 733         add_hook(&match_save_states, INLINE_FN_START);
 734         add_hook(&match_restore_states, INLINE_FN_END);
 735
 736         add_unmatched_state_hook(my_id, &empty_state);
 737         add_pre_merge_hook(my_id, &pre_merge_hook);
 738         add_merge_hook(my_id, &merge_estates);
 739
 740         add_function_hook("copy_from_user", &match_user_copy, INT_PTR(0));
 741         add_function_hook("__copy_from_user", &match_user_copy, INT_PTR(0));
 742         add_function_hook("memcpy_fromiovec", &match_user_copy, INT_PTR(0));
 743         for (i = 0; i < ARRAY_SIZE(kstr_funcs); i++)
 744                 add_function_hook(kstr_funcs[i], &match_user_copy, INT_PTR(2));
 745
 746         add_function_assign_hook("simple_strtol", &match_simple_strtoul, NULL);
 747         add_function_assign_hook("simple_strtoll", &match_simple_strtoul, NULL);
 748         add_function_assign_hook("simple_strtoul", &match_simple_strtoul, NULL);
 749         add_function_assign_hook("simple_strtoull", &match_simple_strtoul, NULL);
 750
 751         add_function_hook("sscanf", &match_sscanf, NULL);
 752
 753         add_function_assign_hook("memdup_user", &match_user_assign_function, NULL);
 754         add_function_assign_hook("kmap_atomic", &match_user_assign_function, NULL);
 755         add_function_assign_hook("skb_network_header", &match_user_assign_function, NULL);
 756
 757         add_hook(&match_syscall_definition, AFTER_DEF_HOOK);
 758
 759         add_hook(&match_assign, ASSIGNMENT_HOOK);
 760
 761         add_hook(&match_call_info, FUNCTION_CALL_HOOK);
 762         add_member_info_callback(my_id, struct_member_callback);
 763         select_caller_info_hook(set_param_user_data, USER_DATA3);
 764         select_return_states_hook(USER_DATA3, &returns_param_user_data);
 765         add_split_return_callback(&param_set_to_user_data);
 766 }
 767
 768 void check_user_data3(int id)
 769 {
 770         my_call_id = id;
 771
 772         if (option_project != PROJ_KERNEL)
 773                 return;
 774         select_caller_info_hook(set_called, INTERNAL);
 775 }
 776