check_kernel.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 /*
  19  * This is kernel specific stuff for smatch_extra.
  20  */
  21
  22 #include "scope.h"
  23 #include "smatch.h"
  24 #include "smatch_slist.h"
  25 #include "smatch_extra.h"
  26
  27 static int implied_err_cast_return(struct expression *call, void *unused, struct range_list **rl)
  28 {
  29         struct expression *arg;
  30
  31         arg = get_argument_from_call_expr(call->args, 0);
  32         if (!get_implied_rl(arg, rl))
  33                 return false;
  34
  35         *rl = cast_rl(get_type(call), *rl);
  36         return !!*rl;
  37 }
  38
  39 static void hack_ERR_PTR(struct symbol *sym)
  40 {
  41         struct symbol *arg;
  42         struct smatch_state *estate;
  43         struct range_list *after;
  44         sval_t low_error = {
  45                 .type = &long_ctype,
  46                 .value = -4095,
  47         };
  48         sval_t minus_one = {
  49                 .type = &long_ctype,
  50                 .value = -1,
  51         };
  52         sval_t zero = {
  53                 .type = &long_ctype,
  54                 .value = 0,
  55         };
  56
  57         if (!sym || !sym->ident)
  58                 return;
  59         if (strcmp(sym->ident->name, "ERR_PTR") != 0)
  60                 return;
  61
  62         arg = first_ptr_list((struct ptr_list *)sym->ctype.base_type->arguments);
  63         if (!arg || !arg->ident)
  64                 return;
  65
  66         estate = get_state(SMATCH_EXTRA, arg->ident->name, arg);
  67         if (!estate) {
  68                 after = alloc_rl(low_error, minus_one);
  69         } else {
  70                 after = rl_intersection(estate_rl(estate), alloc_rl(low_error, zero));
  71                 if (rl_equiv(estate_rl(estate), after))
  72                         return;
  73         }
  74         set_state(SMATCH_EXTRA, arg->ident->name, arg, alloc_estate_rl(after));
  75 }
  76
  77 static void match_param_valid_ptr(const char *fn, struct expression *call_expr,
  78                         struct expression *assign_expr, void *_param)
  79 {
  80         int param = PTR_INT(_param);
  81         struct expression *arg;
  82         struct smatch_state *pre_state;
  83         struct smatch_state *end_state;
  84         struct range_list *rl;
  85
  86         arg = get_argument_from_call_expr(call_expr->args, param);
  87         pre_state = get_state_expr(SMATCH_EXTRA, arg);
  88         if (estate_rl(pre_state)) {
  89                 rl = estate_rl(pre_state);
  90                 rl = remove_range(rl, ptr_null, ptr_null);
  91                 rl = remove_range(rl, ptr_err_min, ptr_err_max);
  92         } else {
  93                 rl = alloc_rl(valid_ptr_min_sval, valid_ptr_max_sval);
  94         }
  95         end_state = alloc_estate_rl(rl);
  96         set_extra_expr_nomod(arg, end_state);
  97 }
  98
  99 static void match_param_err_or_null(const char *fn, struct expression *call_expr,
 100                         struct expression *assign_expr, void *_param)
 101 {
 102         int param = PTR_INT(_param);
 103         struct expression *arg;
 104         struct range_list *pre, *rl;
 105         struct smatch_state *pre_state;
 106         struct smatch_state *end_state;
 107
 108         arg = get_argument_from_call_expr(call_expr->args, param);
 109         pre_state = get_state_expr(SMATCH_EXTRA, arg);
 110         if (pre_state)
 111                 pre = estate_rl(pre_state);
 112         else
 113                 pre = alloc_whole_rl(&ptr_ctype);
 114         call_results_to_rl(call_expr, &ptr_ctype, "0,(-4095)-(-1)", &rl);
 115         rl = rl_intersection(pre, rl);
 116         rl = cast_rl(get_type(arg), rl);
 117         end_state = alloc_estate_rl(rl);
 118         set_extra_expr_nomod(arg, end_state);
 119 }
 120
 121 static void match_not_err(const char *fn, struct expression *call_expr,
 122                         struct expression *assign_expr, void *unused)
 123 {
 124         struct expression *arg;
 125         struct smatch_state *pre_state;
 126         struct range_list *rl;
 127
 128         arg = get_argument_from_call_expr(call_expr->args, 0);
 129         pre_state = get_state_expr(SMATCH_EXTRA, arg);
 130         if (pre_state) {
 131                 rl = estate_rl(pre_state);
 132                 rl = remove_range(rl, ptr_err_min, ptr_err_max);
 133         } else {
 134                 rl = alloc_rl(valid_ptr_min_sval, valid_ptr_max_sval);
 135         }
 136         rl = cast_rl(get_type(arg), rl);
 137         set_extra_expr_nomod(arg, alloc_estate_rl(rl));
 138 }
 139
 140 static void match_err(const char *fn, struct expression *call_expr,
 141                         struct expression *assign_expr, void *unused)
 142 {
 143         struct expression *arg;
 144         struct smatch_state *pre_state;
 145         struct range_list *rl;
 146
 147         arg = get_argument_from_call_expr(call_expr->args, 0);
 148         pre_state = get_state_expr(SMATCH_EXTRA, arg);
 149         rl = estate_rl(pre_state);
 150         if (!rl)
 151                 rl = alloc_rl(ptr_err_min, ptr_err_max);
 152         rl = rl_intersection(rl, alloc_rl(ptr_err_min, ptr_err_max));
 153         rl = cast_rl(get_type(arg), rl);
 154         set_extra_expr_nomod(arg, alloc_estate_rl(rl));
 155 }
 156
 157 static void match_container_of_macro(const char *fn, struct expression *expr, void *unused)
 158 {
 159         set_extra_expr_mod(expr->left, alloc_estate_range(valid_ptr_min_sval, valid_ptr_max_sval));
 160 }
 161
 162 static void match_container_of(struct expression *expr)
 163 {
 164         struct expression *right = expr->right;
 165         char *macro;
 166
 167         /*
 168          * The problem here is that sometimes the container_of() macro is itself
 169          * inside a macro and get_macro() only returns the name of the outside
 170          * macro.
 171          */
 172
 173         /*
 174          * This actually an expression statement assignment but smatch_flow
 175          * pre-mangles it for us so we only get the last chunk:
 176          * sk = (typeof(sk))((char *)__mptr - offsetof(...))
 177          */
 178
 179         macro = get_macro_name(right->pos);
 180         if (!macro)
 181                 return;
 182         if (right->type != EXPR_CAST)
 183                 return;
 184         right = strip_expr(right);
 185         if (right->type != EXPR_BINOP || right->op != '-' ||
 186             right->left->type != EXPR_CAST)
 187                 return;
 188         right = strip_expr(right->left);
 189         if (right->type != EXPR_SYMBOL)
 190                 return;
 191         if (!right->symbol->ident ||
 192             strcmp(right->symbol->ident->name, "__mptr") != 0)
 193                 return;
 194         set_extra_expr_mod(expr->left, alloc_estate_range(valid_ptr_min_sval, valid_ptr_max_sval));
 195 }
 196
 197 static int match_next_bit(struct expression *call, void *unused, struct range_list **rl)
 198 {
 199         struct expression *start_arg;
 200         struct expression *size_arg;
 201         struct symbol *type;
 202         sval_t min, max, tmp;
 203
 204         size_arg = get_argument_from_call_expr(call->args, 1);
 205         /* btw. there isn't a start_arg for find_first_bit() */
 206         start_arg = get_argument_from_call_expr(call->args, 2);
 207
 208         type = get_type(call);
 209         min = sval_type_val(type, 0);
 210         max = sval_type_val(type, sizeof(long long) * 8);
 211
 212         if (get_implied_max(size_arg, &tmp) && tmp.uvalue < max.value)
 213                 max = tmp;
 214         if (start_arg && get_implied_min(start_arg, &tmp) && !sval_is_negative(tmp))
 215                 min = tmp;
 216         if (sval_cmp(min, max) > 0)
 217                 max = min;
 218         min = sval_cast(type, min);
 219         max = sval_cast(type, max);
 220         *rl = alloc_rl(min, max);
 221         return 1;
 222 }
 223
 224 static int match_array_size(struct expression *call, void *unused, struct range_list **rl)
 225 {
 226         struct expression *size;
 227         struct expression *count;
 228         struct expression *mult;
 229         struct range_list *ret;
 230
 231         size = get_argument_from_call_expr(call->args, 0);
 232         count = get_argument_from_call_expr(call->args, 1);
 233         mult = binop_expression(size, '*', count);
 234
 235         if (get_implied_rl(mult, &ret)) {
 236                 *rl = ret;
 237                 return 1;
 238         }
 239
 240         return 0;
 241 }
 242
 243 static int match_ffs(struct expression *call, void *unused, struct range_list **rl)
 244 {
 245         if (get_implied_rl(call, rl))
 246                 return true;
 247         return false;
 248 }
 249
 250 static int match_fls(struct expression *call, void *unused, struct range_list **rl)
 251 {
 252         struct expression *arg;
 253         struct range_list *arg_rl;
 254         sval_t zero = {};
 255         sval_t start = {
 256                 .type = &int_ctype,
 257                 .value = 0,
 258         };
 259         sval_t end = {
 260                 .type = &int_ctype,
 261                 .value = 32,
 262         };
 263         sval_t sval;
 264
 265         arg = get_argument_from_call_expr(call->args, 0);
 266         if (!get_implied_rl(arg, &arg_rl))
 267                 return 0;
 268         if (rl_to_sval(arg_rl, &sval)) {
 269                 int i;
 270
 271                 for (i = 63; i >= 0; i--) {
 272                         if (sval.uvalue & 1ULL << i)
 273                                 break;
 274                 }
 275                 sval.value = i + 1;
 276                 *rl = alloc_rl(sval, sval);
 277                 return 1;
 278         }
 279         zero.type = rl_type(arg_rl);
 280         if (!rl_has_sval(arg_rl, zero))
 281                 start.value = 1;
 282         *rl = alloc_rl(start, end);
 283         return 1;
 284 }
 285
 286 static void find_module_init_exit(struct symbol_list *sym_list)
 287 {
 288         struct symbol *sym;
 289         struct symbol *fn;
 290         struct statement *stmt;
 291         char *name;
 292         int init;
 293         int count;
 294
 295         /*
 296          * This is more complicated because Sparse ignores the "alias"
 297          * attribute.  I search backwards because module_init() is normally at
 298          * the end of the file.
 299          */
 300         count = 0;
 301         FOR_EACH_PTR_REVERSE(sym_list, sym) {
 302                 if (sym->type != SYM_NODE)
 303                         continue;
 304                 if (!(sym->ctype.modifiers & MOD_STATIC))
 305                         continue;
 306                 fn = get_base_type(sym);
 307                 if (!fn)
 308                         continue;
 309                 if (fn->type != SYM_FN)
 310                         continue;
 311                 if (!sym->ident)
 312                         continue;
 313                 if (!fn->inline_stmt)
 314                         continue;
 315                 if (strcmp(sym->ident->name, "__inittest") == 0)
 316                         init = 1;
 317                 else if (strcmp(sym->ident->name, "__exittest") == 0)
 318                         init = 0;
 319                 else
 320                         continue;
 321
 322                 count++;
 323
 324                 stmt = first_ptr_list((struct ptr_list *)fn->inline_stmt->stmts);
 325                 if (!stmt || stmt->type != STMT_RETURN)
 326                         continue;
 327                 name = expr_to_var(stmt->ret_value);
 328                 if (!name)
 329                         continue;
 330                 if (init)
 331                         sql_insert_function_ptr(name, "(struct module)->init");
 332                 else
 333                         sql_insert_function_ptr(name, "(struct module)->exit");
 334                 free_string(name);
 335                 if (count >= 2)
 336                         return;
 337         } END_FOR_EACH_PTR_REVERSE(sym);
 338 }
 339
 340 static void match_end_file(struct symbol_list *sym_list)
 341 {
 342         struct symbol *sym;
 343
 344         /* find the last static symbol in the file */
 345         FOR_EACH_PTR_REVERSE(sym_list, sym) {
 346                 if (!(sym->ctype.modifiers & MOD_STATIC))
 347                         continue;
 348                 if (!sym->scope)
 349                         continue;
 350                 find_module_init_exit(sym->scope->symbols);
 351                 return;
 352         } END_FOR_EACH_PTR_REVERSE(sym);
 353 }
 354
 355 static struct expression *get_val_expr(struct expression *expr)
 356 {
 357         struct symbol *sym, *val;
 358
 359         if (expr->type != EXPR_DEREF)
 360                 return NULL;
 361         expr = expr->deref;
 362         if (expr->type != EXPR_SYMBOL)
 363                 return NULL;
 364         if (strcmp(expr->symbol_name->name, "__u") != 0)
 365                 return NULL;
 366         sym = get_base_type(expr->symbol);
 367         val = first_ptr_list((struct ptr_list *)sym->symbol_list);
 368         if (!val || strcmp(val->ident->name, "__val") != 0)
 369                 return NULL;
 370         return member_expression(expr, '.', val->ident);
 371 }
 372
 373 static void match__write_once_size(const char *fn, struct expression *call,
 374                                void *unused)
 375 {
 376         struct expression *dest, *data, *assign;
 377         struct range_list *rl;
 378
 379         dest = get_argument_from_call_expr(call->args, 0);
 380         if (dest->type != EXPR_PREOP || dest->op != '&')
 381                 return;
 382         dest = strip_expr(dest->unop);
 383
 384         data = get_argument_from_call_expr(call->args, 1);
 385         data = get_val_expr(data);
 386         if (!data)
 387                 return;
 388         get_absolute_rl(data, &rl);
 389         assign = assign_expression(dest, '=', data);
 390
 391         __in_fake_assign++;
 392         __split_expr(assign);
 393         __in_fake_assign--;
 394 }
 395
 396 static void match__read_once_size(const char *fn, struct expression *call,
 397                                void *unused)
 398 {
 399         struct expression *dest, *data, *assign;
 400         struct symbol *type, *val_sym;
 401
 402         /*
 403          * We want to change:
 404          *      __read_once_size_nocheck(&(x), __u.__c, sizeof(x));
 405          * into a fake assignment:
 406          *      __u.val = x;
 407          *
 408          */
 409
 410         data = get_argument_from_call_expr(call->args, 0);
 411         if (data->type != EXPR_PREOP || data->op != '&')
 412                 return;
 413         data = strip_parens(data->unop);
 414
 415         dest = get_argument_from_call_expr(call->args, 1);
 416         if (dest->type != EXPR_DEREF || dest->op != '.')
 417                 return;
 418         if (!dest->member || strcmp(dest->member->name, "__c") != 0)
 419                 return;
 420         dest = dest->deref;
 421         type = get_type(dest);
 422         if (!type)
 423                 return;
 424         val_sym = first_ptr_list((struct ptr_list *)type->symbol_list);
 425         dest = member_expression(dest, '.', val_sym->ident);
 426
 427         assign = assign_expression(dest, '=', data);
 428         __in_fake_assign++;
 429         __split_expr(assign);
 430         __in_fake_assign--;
 431 }
 432
 433 static void match_closure_call(const char *name, struct expression *call,
 434                                void *unused)
 435 {
 436         struct expression *cl, *fn, *fake_call;
 437         struct expression_list *args = NULL;
 438
 439         cl = get_argument_from_call_expr(call->args, 0);
 440         fn = get_argument_from_call_expr(call->args, 1);
 441         if (!fn || !cl)
 442                 return;
 443
 444         add_ptr_list(&args, cl);
 445         fake_call = call_expression(fn, args);
 446         __split_expr(fake_call);
 447 }
 448
 449 static bool has_inc_state(const char *name, struct symbol *sym)
 450 {
 451         static int refcount_id;
 452         struct sm_state *sm, *tmp;
 453
 454         if (!refcount_id)
 455                 refcount_id = id_from_name("check_refcount_info");
 456
 457         sm = get_sm_state(refcount_id, name, sym);
 458         if (!sm)
 459                 return false;
 460
 461         FOR_EACH_PTR(sm->possible, tmp) {
 462                 if (strcmp(tmp->state->name, "inc") == 0)
 463                         return true;
 464                 /*
 465                  * &ignore counts as an inc, because that's what happens when
 466                  * you double increment.  Not ideal.
 467                  */
 468                 if (strcmp(tmp->state->name, "ignore") == 0)
 469                         return true;
 470         } END_FOR_EACH_PTR(tmp);
 471
 472         return false;
 473 }
 474
 475 static void match_kref_put(const char *fn, struct expression *call_expr,
 476                            struct expression *expr, void *_unused)
 477 {
 478         struct expression *data, *release, *fake_call;
 479         struct expression_list *args = NULL;
 480         struct symbol *sym;
 481         char *ref;
 482
 483
 484         if (call_expr->type != EXPR_CALL)
 485                 return;
 486
 487         data = get_argument_from_call_expr(call_expr->args, 0);
 488
 489         ref = get_name_sym_from_param_key(call_expr, 0, "$->refcount.refs.counter", &sym);
 490         if (has_inc_state(ref, sym))
 491                 return;
 492
 493         release = get_argument_from_call_expr(call_expr->args, 1);
 494
 495         add_ptr_list(&args, data);
 496         fake_call = call_expression(release, args);
 497         add_fake_call_after_return(fake_call);
 498 }
 499
 500 static void match_kernel_param(struct symbol *sym)
 501 {
 502         struct expression *var;
 503         struct symbol *type;
 504
 505         /* This was designed to parse the module_param_named() macro */
 506
 507         if (!sym->ident ||
 508             !sym->initializer ||
 509             sym->initializer->type != EXPR_INITIALIZER)
 510                 return;
 511
 512         type = get_real_base_type(sym);
 513         if (!type || type->type != SYM_STRUCT || !type->ident)
 514                 return;
 515         if (strcmp(type->ident->name, "kernel_param") != 0)
 516                 return;
 517
 518         var = last_ptr_list((struct ptr_list *)sym->initializer->expr_list);
 519         if (!var || var->type != EXPR_INITIALIZER)
 520                 return;
 521         var = first_ptr_list((struct ptr_list *)var->expr_list);
 522         if (!var || var->type != EXPR_PREOP || var->op != '&')
 523                 return;
 524         var = strip_expr(var->unop);
 525
 526         type = get_type(var);
 527         update_mtag_data(var, alloc_estate_whole(type));
 528 }
 529
 530 bool is_ignored_kernel_data(const char *name)
 531 {
 532         char *p;
 533
 534         if (option_project != PROJ_KERNEL)
 535                 return false;
 536
 537         /*
 538          * On the file I was looking at lockdep was 25% of the DB.
 539          */
 540         if (strstr(name, ".dep_map."))
 541                 return true;
 542         if (strstr(name, "->dep_map."))
 543                 return true;
 544         if (strstr(name, ".lockdep_map."))
 545                 return true;
 546
 547         if (strstr(name, ".rwsem."))
 548                 return true;
 549         if (strstr(name, "->rwsem."))
 550                 return true;
 551
 552         if (strstr(name, "->mutex."))
 553                 return true;
 554         if (strstr(name, "->lockdep_mutex."))
 555                 return true;
 556
 557         if (strstr(name, ".completion.wait."))
 558                 return true;
 559
 560         if (strstr(name, "kobj.kset-"))
 561                 return true;
 562         if (strstr(name, "power.suspend_timer."))
 563                 return true;
 564         if (strstr(name, "power.work."))
 565                 return true;
 566         if (strstr(name, ".lock.rlock."))
 567                 return true;
 568         if (strstr(name, "lockdep_mutex."))
 569                 return true;
 570
 571         if (strstr(name, ">klist_devices."))
 572                 return true;
 573
 574         if (strstr(name, "->m_log->"))
 575                 return true;
 576
 577         if (strstr(name, ".wait_lock."))
 578                 return true;
 579         if (strstr(name, "regmap->lock_arg"))
 580                 return true;
 581         if (strstr(name, "kworker->task"))
 582                 return true;
 583         if (strstr(name, "->algo_data->"))
 584                 return true;
 585
 586         /* ignore mutex internals */
 587         if ((p = strstr(name, ".rlock.")) ||
 588             (p = strstr(name, ">rlock."))) {
 589                 p += 7;
 590                 if (strncmp(p, "raw_lock", 8) == 0 ||
 591                     strcmp(p, "owner") == 0 ||
 592                     strcmp(p, "owner_cpu") == 0 ||
 593                     strcmp(p, "magic") == 0 ||
 594                     strcmp(p, "dep_map") == 0)
 595                         return true;
 596         }
 597
 598         return false;
 599 }
 600
 601 int get_gfp_param(struct expression *expr)
 602 {
 603         struct symbol *type;
 604         struct symbol *arg, *arg_type;
 605         int param;
 606
 607         if (expr->type != EXPR_CALL)
 608                 return -1;
 609         type = get_type(expr->fn);
 610         if (!type)
 611                 return -1;
 612         if (type->type == SYM_PTR)
 613                 type = get_real_base_type(type);
 614         if (type->type != SYM_FN)
 615                 return -1;
 616
 617         param = 0;
 618         FOR_EACH_PTR(type->arguments, arg) {
 619                 arg_type = get_base_type(arg);
 620                 if (arg_type && arg_type->ident &&
 621                     strcmp(arg_type->ident->name, "gfp_t") == 0)
 622                         return param;
 623                 param++;
 624         } END_FOR_EACH_PTR(arg);
 625
 626         return -1;
 627 }
 628
 629 static void match_function_def(struct symbol *sym)
 630 {
 631         char *macro;
 632
 633         macro = get_macro_name(sym->pos);
 634         if (!macro)
 635                 return;
 636         if (strcmp(macro, "TRACE_EVENT") == 0)
 637                 set_function_skipped();
 638 }
 639
 640 static bool delete_pci_error_returns(struct expression *expr)
 641 {
 642         const char *macro;
 643         sval_t sval;
 644
 645         if (!get_value(expr, &sval))
 646                 return false;
 647         if (sval.value < 0x80 || sval.value > 0x90)
 648                 return false;
 649
 650         macro = get_macro_name(expr->pos);
 651         if (!macro)
 652                 return false;
 653
 654         if (strncmp(macro, "PCIBIOS_", 8) != 0)
 655                 return false;
 656
 657         if (strcmp(macro, "PCIBIOS_FUNC_NOT_SUPPORTED") == 0  ||
 658             strcmp(macro, "PCIBIOS_BAD_VENDOR_ID") == 0       ||
 659             strcmp(macro, "PCIBIOS_DEVICE_NOT_FOUND") == 0    ||
 660             strcmp(macro, "PCIBIOS_BAD_REGISTER_NUMBER") == 0 ||
 661             strcmp(macro, "PCIBIOS_SET_FAILED") == 0          ||
 662             strcmp(macro, "PCIBIOS_BUFFER_TOO_SMALL") == 0)
 663                 return true;
 664
 665         return false;
 666 }
 667
 668 static bool match_with_intel_runtime(struct statement *stmt)
 669 {
 670         char *macro;
 671
 672         macro = get_macro_name(stmt->pos);
 673         if (!macro)
 674                 return false;
 675         if (strncmp(macro, "with_intel_runtime", 18) == 0)
 676                 return true;
 677         return false;
 678 }
 679
 680 void check_kernel(int id)
 681 {
 682         if (option_project != PROJ_KERNEL)
 683                 return;
 684
 685         add_implied_return_hook("ERR_PTR", &implied_err_cast_return, NULL);
 686         add_implied_return_hook("ERR_CAST", &implied_err_cast_return, NULL);
 687         add_implied_return_hook("PTR_ERR", &implied_err_cast_return, NULL);
 688         add_hook(hack_ERR_PTR, AFTER_DEF_HOOK);
 689         return_implies_state("IS_ERR_OR_NULL", 0, 0, &match_param_valid_ptr, (void *)0);
 690         return_implies_state("IS_ERR_OR_NULL", 1, 1, &match_param_err_or_null, (void *)0);
 691         return_implies_state("IS_ERR", 0, 0, &match_not_err, NULL);
 692         return_implies_state("IS_ERR", 1, 1, &match_err, NULL);
 693         return_implies_state("tomoyo_memory_ok", 1, 1, &match_param_valid_ptr, (void *)0);
 694
 695         add_macro_assign_hook_extra("container_of", &match_container_of_macro, NULL);
 696         add_hook(match_container_of, ASSIGNMENT_HOOK);
 697
 698         add_implied_return_hook("find_next_bit", &match_next_bit, NULL);
 699         add_implied_return_hook("find_next_zero_bit", &match_next_bit, NULL);
 700         add_implied_return_hook("find_first_bit", &match_next_bit, NULL);
 701         add_implied_return_hook("find_first_zero_bit", &match_next_bit, NULL);
 702
 703         add_implied_return_hook("array_size", &match_array_size, NULL);
 704
 705         add_implied_return_hook("__ffs", &match_ffs, NULL);
 706         add_implied_return_hook("fls", &match_fls, NULL);
 707         add_implied_return_hook("__fls", &match_fls, NULL);
 708         add_implied_return_hook("fls64", &match_fls, NULL);
 709
 710         add_function_hook("__ftrace_bad_type", &__match_nullify_path_hook, NULL);
 711         add_function_hook("__write_once_size", &match__write_once_size, NULL);
 712
 713         add_function_hook("__read_once_size", &match__read_once_size, NULL);
 714         add_function_hook("__read_once_size_nocheck", &match__read_once_size, NULL);
 715
 716         add_function_hook("closure_call", &match_closure_call, NULL);
 717         return_implies_state_sval("kref_put", int_one, int_one, &match_kref_put, NULL);
 718
 719         add_once_through_hook(&match_with_intel_runtime);
 720
 721         add_hook(&match_kernel_param, BASE_HOOK);
 722         add_hook(&match_function_def, FUNC_DEF_HOOK);
 723
 724         if (option_info)
 725                 add_hook(match_end_file, END_FILE_HOOK);
 726
 727         add_delete_return_hook(&delete_pci_error_returns);
 728 }