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 <string.h> 19 #include <errno.h> 20 #include <unistd.h> 21 #include <ctype.h> 22 #include "smatch.h" 23 #include "smatch_slist.h" 24 #include "smatch_extra.h" 25 26 struct sqlite3 *smatch_db; 27 struct sqlite3 *mem_db; 28 struct sqlite3 *cache_db; 29 30 int debug_db; 31 32 static int return_id; 33 34 static void call_return_state_hooks(struct expression *expr); 35 36 #define SQLITE_CACHE_PAGES 1000 37 38 struct def_callback { 39 int hook_type; 40 void (*callback)(const char *name, struct symbol *sym, char *key, char *value); 41 }; 42 ALLOCATOR(def_callback, "definition db hook callbacks"); 43 DECLARE_PTR_LIST(callback_list, struct def_callback); 44 static struct callback_list *select_caller_info_callbacks; 45 46 struct member_info_callback { 47 int owner; 48 void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm); 49 }; 50 ALLOCATOR(member_info_callback, "caller_info callbacks"); 51 DECLARE_PTR_LIST(member_info_cb_list, struct member_info_callback); 52 static struct member_info_cb_list *member_callbacks; 53 static struct member_info_cb_list *member_callbacks_new; 54 55 struct returned_state_callback { 56 void (*callback)(int return_id, char *return_ranges, struct expression *return_expr); 57 }; 58 ALLOCATOR(returned_state_callback, "returned state callbacks"); 59 DECLARE_PTR_LIST(returned_state_cb_list, struct returned_state_callback); 60 static struct returned_state_cb_list *returned_state_callbacks; 61 62 struct returned_member_callback { 63 int owner; 64 void (*callback)(int return_id, char *return_ranges, struct expression *expr, char *printed_name, struct smatch_state *state); 65 }; 66 ALLOCATOR(returned_member_callback, "returned member callbacks"); 67 DECLARE_PTR_LIST(returned_member_cb_list, struct returned_member_callback); 68 static struct returned_member_cb_list *returned_member_callbacks; 69 70 struct db_implies_callback { 71 int type; 72 void (*callback)(struct expression *call, struct expression *arg, char *key, char *value); 73 }; 74 ALLOCATOR(db_implies_callback, "return_implies callbacks"); 75 DECLARE_PTR_LIST(db_implies_cb_list, struct db_implies_callback); 76 static struct db_implies_cb_list *return_implies_cb_list; 77 static struct db_implies_cb_list *call_implies_cb_list; 78 79 /* silently truncates if needed. */ 80 char *escape_newlines(const char *str) 81 { 82 char buf[1024] = ""; 83 bool found = false; 84 int i, j; 85 86 for (i = 0, j = 0; str[i] != '\0' && j != sizeof(buf); i++, j++) { 87 if (str[i] != '\r' && str[i] != '\n') { 88 buf[j] = str[i]; 89 continue; 90 } 91 92 found = true; 93 buf[j++] = '\\'; 94 if (j == sizeof(buf)) 95 break; 96 buf[j] = 'n'; 97 } 98 99 if (!found) 100 return alloc_sname(str); 101 102 if (j == sizeof(buf)) 103 buf[j - 1] = '\0'; 104 return alloc_sname(buf); 105 } 106 107 static int print_sql_output(void *unused, int argc, char **argv, char **azColName) 108 { 109 int i; 110 111 for (i = 0; i < argc; i++) { 112 if (i != 0) 113 sm_printf(", "); 114 sm_printf("%s", argv[i]); 115 } 116 sm_printf("\n"); 117 return 0; 118 } 119 120 void sql_exec(struct sqlite3 *db, int (*callback)(void*, int, char**, char**), void *data, const char *sql) 121 { 122 char *err = NULL; 123 int rc; 124 125 if (!db) 126 return; 127 128 if (option_debug || debug_db) { 129 sm_msg("%s", sql); 130 if (strncasecmp(sql, "select", strlen("select")) == 0) 131 sqlite3_exec(db, sql, print_sql_output, NULL, NULL); 132 } 133 134 rc = sqlite3_exec(db, sql, callback, data, &err); 135 if (rc != SQLITE_OK && !parse_error) { 136 sm_ierror("%s:%d SQL error #2: %s\n", get_filename(), get_lineno(), err); 137 sm_ierror("%s:%d SQL: '%s'\n", get_filename(), get_lineno(), sql); 138 parse_error = 1; 139 } 140 } 141 142 static int replace_count; 143 static char **replace_table; 144 static const char *replace_return_ranges(const char *return_ranges) 145 { 146 int i; 147 148 if (!get_function()) { 149 /* I have no idea why EXPORT_SYMBOL() is here */ 150 return return_ranges; 151 } 152 for (i = 0; i < replace_count; i += 3) { 153 if (strcmp(replace_table[i + 0], get_function()) == 0) { 154 if (strcmp(replace_table[i + 1], return_ranges) == 0) 155 return replace_table[i + 2]; 156 } 157 } 158 return return_ranges; 159 } 160 161 162 static char *use_states; 163 static int get_db_state_count(void) 164 { 165 struct sm_state *sm; 166 int count = 0; 167 168 FOR_EACH_SM(__get_cur_stree(), sm) { 169 if (sm->owner == USHRT_MAX) 170 continue; 171 if (use_states[sm->owner]) 172 count++; 173 } END_FOR_EACH_SM(sm); 174 return count; 175 } 176 177 void db_ignore_states(int id) 178 { 179 use_states[id] = 0; 180 } 181 182 unsigned long long __fn_mtag; 183 static void set_fn_mtag(struct symbol *sym) 184 { 185 char buf[128]; 186 187 if (cur_func_sym->ctype.modifiers & MOD_STATIC) 188 snprintf(buf, sizeof(buf), "%s %s", get_base_file(), get_function()); 189 else 190 snprintf(buf, sizeof(buf), "extern %s", get_function()); 191 192 __fn_mtag = str_to_mtag(buf); 193 } 194 195 void sql_insert_return_states(int return_id, const char *return_ranges, 196 int type, int param, const char *key, const char *value) 197 { 198 unsigned long long id; 199 200 201 if (key && strlen(key) >= 80) 202 return; 203 if (__inline_fn) 204 id = (unsigned long)__inline_fn; 205 else 206 id = __fn_mtag; 207 208 return_ranges = replace_return_ranges(return_ranges); 209 sql_insert(return_states, "'%s', '%s', %llu, %d, '%s', %d, %d, %d, '%s', '%s'", 210 get_base_file(), get_function(), id, return_id, 211 return_ranges, fn_static(), type, param, key, value); 212 } 213 214 static struct string_list *common_funcs; 215 static int is_common_function(const char *fn) 216 { 217 char *tmp; 218 219 if (!fn) 220 return 0; 221 222 if (strncmp(fn, "__builtin_", 10) == 0) 223 return 1; 224 225 FOR_EACH_PTR(common_funcs, tmp) { 226 if (strcmp(tmp, fn) == 0) 227 return 1; 228 } END_FOR_EACH_PTR(tmp); 229 230 return 0; 231 } 232 233 static char *function_signature(void) 234 { 235 return type_to_str(get_real_base_type(cur_func_sym)); 236 } 237 238 void sql_insert_caller_info(struct expression *call, int type, 239 int param, const char *key, const char *value) 240 { 241 FILE *tmp_fd = sm_outfd; 242 char *fn; 243 244 if (!option_info && !__inline_call) 245 return; 246 247 if (key && strlen(key) >= 80) 248 return; 249 250 fn = get_fnptr_name(call->fn); 251 if (!fn) 252 return; 253 254 if (__inline_call) { 255 mem_sql(NULL, NULL, 256 "insert into caller_info values ('%s', '%s', '%s', %lu, %d, %d, %d, '%s', '%s');", 257 get_base_file(), get_function(), fn, (unsigned long)call, 258 is_static(call->fn), type, param, key, value); 259 } 260 261 if (!option_info) 262 return; 263 264 if (strncmp(fn, "__builtin_", 10) == 0) 265 return; 266 if (type != INTERNAL && is_common_function(fn)) 267 return; 268 269 sm_outfd = caller_info_fd; 270 sm_msg("SQL_caller_info: insert into caller_info values (" 271 "'%s', '%s', '%s', %%CALL_ID%%, %d, %d, %d, '%s', '%s');", 272 get_base_file(), get_function(), fn, is_static(call->fn), 273 type, param, key, value); 274 sm_outfd = tmp_fd; 275 276 free_string(fn); 277 } 278 279 void sql_insert_function_ptr(const char *fn, const char *struct_name) 280 { 281 sql_insert_or_ignore(function_ptr, "'%s', '%s', '%s', 0", 282 get_base_file(), fn, struct_name); 283 } 284 285 void sql_insert_return_implies(int type, int param, const char *key, const char *value) 286 { 287 sql_insert_or_ignore(return_implies, "'%s', '%s', %lu, %d, %d, %d, '%s', '%s'", 288 get_base_file(), get_function(), (unsigned long)__inline_fn, 289 fn_static(), type, param, key, value); 290 } 291 292 void sql_insert_call_implies(int type, int param, const char *key, const char *value) 293 { 294 sql_insert_or_ignore(call_implies, "'%s', '%s', %lu, %d, %d, %d, '%s', '%s'", 295 get_base_file(), get_function(), (unsigned long)__inline_fn, 296 fn_static(), type, param, key, value); 297 } 298 299 void sql_insert_function_type_size(const char *member, const char *ranges) 300 { 301 sql_insert(function_type_size, "'%s', '%s', '%s', '%s'", get_base_file(), get_function(), member, ranges); 302 } 303 304 void sql_insert_function_type_info(int type, const char *struct_type, const char *member, const char *value) 305 { 306 sql_insert(function_type_info, "'%s', '%s', %d, '%s', '%s', '%s'", get_base_file(), get_function(), type, struct_type, member, value); 307 } 308 309 void sql_insert_type_info(int type, const char *member, const char *value) 310 { 311 sql_insert_cache(type_info, "'%s', %d, '%s', '%s'", get_base_file(), type, member, value); 312 } 313 314 void sql_insert_local_values(const char *name, const char *value) 315 { 316 sql_insert(local_values, "'%s', '%s', '%s'", get_base_file(), name, value); 317 } 318 319 void sql_insert_function_type_value(const char *type, const char *value) 320 { 321 sql_insert(function_type_value, "'%s', '%s', '%s', '%s'", get_base_file(), get_function(), type, value); 322 } 323 324 void sql_insert_function_type(int param, const char *value) 325 { 326 sql_insert(function_type, "'%s', '%s', %d, %d, '%s'", 327 get_base_file(), get_function(), fn_static(), param, value); 328 } 329 330 void sql_insert_parameter_name(int param, const char *value) 331 { 332 sql_insert(parameter_name, "'%s', '%s', %d, %d, '%s'", 333 get_base_file(), get_function(), fn_static(), param, value); 334 } 335 336 void sql_insert_data_info(struct expression *data, int type, const char *value) 337 { 338 char *data_name; 339 340 data_name = get_data_info_name(data); 341 if (!data_name) 342 return; 343 sql_insert(data_info, "'%s', '%s', %d, '%s'", 344 is_static(data) ? get_base_file() : "extern", 345 data_name, type, value); 346 } 347 348 void sql_insert_data_info_var_sym(const char *var, struct symbol *sym, int type, const char *value) 349 { 350 sql_insert(data_info, "'%s', '%s', %d, '%s'", 351 (sym->ctype.modifiers & MOD_STATIC) ? get_base_file() : "extern", 352 var, type, value); 353 } 354 355 void sql_save_constraint(const char *con) 356 { 357 if (!option_info) 358 return; 359 360 sm_msg("SQL: insert or ignore into constraints (str) values('%s');", escape_newlines(con)); 361 } 362 363 void sql_save_constraint_required(const char *data, int op, const char *limit) 364 { 365 sql_insert_or_ignore(constraints_required, "'%s', '%s', '%s'", data, show_special(op), limit); 366 } 367 368 void sql_copy_constraint_required(const char *new_limit, const char *old_limit) 369 { 370 if (!option_info) 371 return; 372 373 sm_msg("SQL_late: insert or ignore into constraints_required (data, op, bound) " 374 "select constraints_required.data, constraints_required.op, '%s' from " 375 "constraints_required where bound = '%s';", new_limit, old_limit); 376 } 377 378 void sql_insert_fn_ptr_data_link(const char *ptr, const char *data) 379 { 380 sql_insert_or_ignore(fn_ptr_data_link, "'%s', '%s'", ptr, data); 381 } 382 383 void sql_insert_fn_data_link(struct expression *fn, int type, int param, const char *key, const char *value) 384 { 385 if (fn->type != EXPR_SYMBOL || !fn->symbol->ident) 386 return; 387 388 sql_insert(fn_data_link, "'%s', '%s', %d, %d, %d, '%s', '%s'", 389 (fn->symbol->ctype.modifiers & MOD_STATIC) ? get_base_file() : "extern", 390 fn->symbol->ident->name, 391 !!(fn->symbol->ctype.modifiers & MOD_STATIC), 392 type, param, key, value); 393 } 394 395 void sql_insert_mtag_about(mtag_t tag, const char *left_name, const char *right_name) 396 { 397 sql_insert_cache(mtag_about, "%lld, '%s', '%s', %d, '%s', '%s'", 398 tag, get_filename(), get_function(), get_lineno(), 399 left_name, right_name); 400 } 401 402 void sql_insert_mtag_info(mtag_t tag, int type, const char *value) 403 { 404 sql_insert_cache(mtag_info, "'%s', %lld, %d, '%s'", get_filename(), tag, type, value); 405 } 406 407 void sql_insert_mtag_map(mtag_t container, int container_offset, mtag_t tag, int tag_offset) 408 { 409 sql_insert(mtag_map, "%lld, %d, %lld, %d", container, container_offset, tag, tag_offset); 410 } 411 412 void sql_insert_mtag_alias(mtag_t orig, mtag_t alias) 413 { 414 sql_insert(mtag_alias, "%lld, %lld", orig, alias); 415 } 416 417 static int save_mtag(void *_tag, int argc, char **argv, char **azColName) 418 { 419 mtag_t *saved_tag = _tag; 420 mtag_t new_tag; 421 422 new_tag = strtoll(argv[0], NULL, 10); 423 424 if (!*saved_tag) 425 *saved_tag = new_tag; 426 else if (*saved_tag != new_tag) 427 *saved_tag = -1ULL; 428 429 return 0; 430 } 431 432 int mtag_map_select_container(mtag_t tag, int container_offset, mtag_t *container) 433 { 434 mtag_t tmp = 0; 435 436 run_sql(save_mtag, &tmp, 437 "select container from mtag_map where tag = %lld and container_offset = %d and tag_offset = 0;", 438 tag, container_offset); 439 440 if (tmp == 0 || tmp == -1ULL) 441 return 0; 442 *container = tmp; 443 return 1; 444 } 445 446 int mtag_map_select_tag(mtag_t container, int offset, mtag_t *tag) 447 { 448 mtag_t tmp = 0; 449 450 run_sql(save_mtag, &tmp, 451 "select tag from mtag_map where container = %lld and container_offset = %d;", 452 container, offset); 453 454 if (tmp == 0 || tmp == -1ULL) 455 return 0; 456 *tag = tmp; 457 return 1; 458 } 459 460 char *get_static_filter(struct symbol *sym) 461 { 462 static char sql_filter[1024]; 463 464 /* This can only happen on buggy code. Return invalid SQL. */ 465 if (!sym) { 466 sql_filter[0] = '\0'; 467 return sql_filter; 468 } 469 470 if (sym->ctype.modifiers & MOD_STATIC) { 471 snprintf(sql_filter, sizeof(sql_filter), 472 "file = '%s' and function = '%s' and static = '1'", 473 get_base_file(), sym->ident->name); 474 } else { 475 snprintf(sql_filter, sizeof(sql_filter), 476 "function = '%s' and static = '0'", sym->ident->name); 477 } 478 479 return sql_filter; 480 } 481 482 static int get_row_count(void *_row_count, int argc, char **argv, char **azColName) 483 { 484 int *row_count = _row_count; 485 486 *row_count = 0; 487 if (argc != 1) 488 return 0; 489 *row_count = atoi(argv[0]); 490 return 0; 491 } 492 493 static void mark_call_params_untracked(struct expression *call) 494 { 495 struct expression *arg; 496 int i = 0; 497 498 FOR_EACH_PTR(call->args, arg) { 499 mark_untracked(call, i++, "$", NULL); 500 } END_FOR_EACH_PTR(arg); 501 } 502 503 static void sql_select_return_states_pointer(const char *cols, 504 struct expression *call, int (*callback)(void*, int, char**, char**), void *info) 505 { 506 char *ptr; 507 int return_count = 0; 508 509 ptr = get_fnptr_name(call->fn); 510 if (!ptr) 511 return; 512 513 run_sql(get_row_count, &return_count, 514 "select count(*) from return_states join function_ptr " 515 "where return_states.function == function_ptr.function and " 516 "ptr = '%s' and searchable = 1 and type = %d;", ptr, INTERNAL); 517 /* The magic number 100 is just from testing on the kernel. */ 518 if (return_count > 100) { 519 mark_call_params_untracked(call); 520 return; 521 } 522 523 run_sql(callback, info, 524 "select %s from return_states join function_ptr where " 525 "return_states.function == function_ptr.function and ptr = '%s' " 526 "and searchable = 1 " 527 "order by function_ptr.file, return_states.file, return_id, type;", 528 cols, ptr); 529 } 530 531 static int is_local_symbol(struct expression *expr) 532 { 533 if (expr->type != EXPR_SYMBOL) 534 return 0; 535 if (expr->symbol->ctype.modifiers & (MOD_NONLOCAL | MOD_STATIC | MOD_ADDRESSABLE)) 536 return 0; 537 return 1; 538 } 539 540 void sql_select_return_states(const char *cols, struct expression *call, 541 int (*callback)(void*, int, char**, char**), void *info) 542 { 543 struct expression *fn; 544 int row_count = 0; 545 546 if (is_fake_call(call)) 547 return; 548 549 fn = strip_expr(call->fn); 550 if (fn->type != EXPR_SYMBOL || !fn->symbol || is_local_symbol(fn)) { 551 sql_select_return_states_pointer(cols, call, callback, info); 552 return; 553 } 554 555 if (inlinable(fn)) { 556 mem_sql(callback, info, 557 "select %s from return_states where call_id = '%lu' order by return_id, type;", 558 cols, (unsigned long)call); 559 return; 560 } 561 562 run_sql(get_row_count, &row_count, "select count(*) from return_states where %s;", 563 get_static_filter(fn->symbol)); 564 if (row_count > 3000) 565 return; 566 567 run_sql(callback, info, "select %s from return_states where %s order by file, return_id, type;", 568 cols, get_static_filter(fn->symbol)); 569 } 570 571 #define CALL_IMPLIES 0 572 #define RETURN_IMPLIES 1 573 574 struct implies_info { 575 int type; 576 struct db_implies_cb_list *cb_list; 577 struct expression *expr; 578 struct symbol *sym; 579 }; 580 581 void sql_select_implies(const char *cols, struct implies_info *info, 582 int (*callback)(void*, int, char**, char**)) 583 { 584 if (info->type == RETURN_IMPLIES && inlinable(info->expr->fn)) { 585 mem_sql(callback, info, 586 "select %s from return_implies where call_id = '%lu';", 587 cols, (unsigned long)info->expr); 588 return; 589 } 590 591 run_sql(callback, info, "select %s from %s_implies where %s;", 592 cols, 593 info->type == CALL_IMPLIES ? "call" : "return", 594 get_static_filter(info->sym)); 595 } 596 597 struct select_caller_info_data { 598 struct stree *final_states; 599 struct timeval start_time; 600 int prev_func_id; 601 int ignore; 602 int results; 603 }; 604 605 static int caller_info_callback(void *_data, int argc, char **argv, char **azColName); 606 607 static void sql_select_caller_info(struct select_caller_info_data *data, 608 const char *cols, struct symbol *sym) 609 { 610 if (__inline_fn) { 611 mem_sql(caller_info_callback, data, 612 "select %s from caller_info where call_id = %lu;", 613 cols, (unsigned long)__inline_fn); 614 return; 615 } 616 617 if (sym->ident->name && is_common_function(sym->ident->name)) 618 return; 619 run_sql(caller_info_callback, data, 620 "select %s from common_caller_info where %s order by call_id;", 621 cols, get_static_filter(sym)); 622 if (data->results) 623 return; 624 625 run_sql(caller_info_callback, data, 626 "select %s from caller_info where %s order by call_id;", 627 cols, get_static_filter(sym)); 628 } 629 630 void select_caller_info_hook(void (*callback)(const char *name, struct symbol *sym, char *key, char *value), int type) 631 { 632 struct def_callback *def_callback = __alloc_def_callback(0); 633 634 def_callback->hook_type = type; 635 def_callback->callback = callback; 636 add_ptr_list(&select_caller_info_callbacks, def_callback); 637 } 638 639 /* 640 * These call backs are used when the --info option is turned on to print struct 641 * member information. For example foo->bar could have a state in 642 * smatch_extra.c and also check_user.c. 643 */ 644 void add_member_info_callback(int owner, void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm)) 645 { 646 struct member_info_callback *member_callback = __alloc_member_info_callback(0); 647 648 member_callback->owner = owner; 649 member_callback->callback = callback; 650 add_ptr_list(&member_callbacks, member_callback); 651 } 652 653 void add_caller_info_callback(int owner, void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm)) 654 { 655 struct member_info_callback *member_callback = __alloc_member_info_callback(0); 656 657 member_callback->owner = owner; 658 member_callback->callback = callback; 659 add_ptr_list(&member_callbacks_new, member_callback); 660 } 661 662 void add_split_return_callback(void (*fn)(int return_id, char *return_ranges, struct expression *returned_expr)) 663 { 664 struct returned_state_callback *callback = __alloc_returned_state_callback(0); 665 666 callback->callback = fn; 667 add_ptr_list(&returned_state_callbacks, callback); 668 } 669 670 void add_returned_member_callback(int owner, void (*callback)(int return_id, char *return_ranges, struct expression *expr, char *printed_name, struct smatch_state *state)) 671 { 672 struct returned_member_callback *member_callback = __alloc_returned_member_callback(0); 673 674 member_callback->owner = owner; 675 member_callback->callback = callback; 676 add_ptr_list(&returned_member_callbacks, member_callback); 677 } 678 679 void select_call_implies_hook(int type, void (*callback)(struct expression *call, struct expression *arg, char *key, char *value)) 680 { 681 struct db_implies_callback *cb = __alloc_db_implies_callback(0); 682 683 cb->type = type; 684 cb->callback = callback; 685 add_ptr_list(&call_implies_cb_list, cb); 686 } 687 688 void select_return_implies_hook(int type, void (*callback)(struct expression *call, struct expression *arg, char *key, char *value)) 689 { 690 struct db_implies_callback *cb = __alloc_db_implies_callback(0); 691 692 cb->type = type; 693 cb->callback = callback; 694 add_ptr_list(&return_implies_cb_list, cb); 695 } 696 697 struct return_info { 698 struct expression *static_returns_call; 699 struct symbol *return_type; 700 struct range_list *return_range_list; 701 }; 702 703 static int db_return_callback(void *_ret_info, int argc, char **argv, char **azColName) 704 { 705 struct return_info *ret_info = _ret_info; 706 struct range_list *rl; 707 struct expression *call_expr = ret_info->static_returns_call; 708 709 if (argc != 1) 710 return 0; 711 call_results_to_rl(call_expr, ret_info->return_type, argv[0], &rl); 712 ret_info->return_range_list = rl_union(ret_info->return_range_list, rl); 713 return 0; 714 } 715 716 struct range_list *db_return_vals(struct expression *expr) 717 { 718 struct return_info ret_info = {}; 719 char buf[64]; 720 struct sm_state *sm; 721 722 if (is_fake_call(expr)) 723 return NULL; 724 725 snprintf(buf, sizeof(buf), "return %p", expr); 726 sm = get_sm_state(SMATCH_EXTRA, buf, NULL); 727 if (sm) 728 return clone_rl(estate_rl(sm->state)); 729 ret_info.static_returns_call = expr; 730 ret_info.return_type = get_type(expr); 731 if (!ret_info.return_type) 732 return NULL; 733 734 if (expr->fn->type != EXPR_SYMBOL || !expr->fn->symbol) 735 return NULL; 736 737 ret_info.return_range_list = NULL; 738 if (inlinable(expr->fn)) { 739 mem_sql(db_return_callback, &ret_info, 740 "select distinct return from return_states where call_id = '%lu';", 741 (unsigned long)expr); 742 } else { 743 run_sql(db_return_callback, &ret_info, 744 "select distinct return from return_states where %s;", 745 get_static_filter(expr->fn->symbol)); 746 } 747 return ret_info.return_range_list; 748 } 749 750 struct range_list *db_return_vals_from_str(const char *fn_name) 751 { 752 struct return_info ret_info; 753 754 ret_info.static_returns_call = NULL; 755 ret_info.return_type = &llong_ctype; 756 ret_info.return_range_list = NULL; 757 758 run_sql(db_return_callback, &ret_info, 759 "select distinct return from return_states where function = '%s';", 760 fn_name); 761 return ret_info.return_range_list; 762 } 763 764 /* 765 * This is used when we have a function that takes a function pointer as a 766 * parameter. "frob(blah, blah, my_function);" We know that the return values 767 * from frob() come from my_funcion() so we want to find the possible returns 768 * of my_function(), but we don't know which arguments are passed to it. 769 * 770 */ 771 struct range_list *db_return_vals_no_args(struct expression *expr) 772 { 773 struct return_info ret_info = {}; 774 775 if (!expr || expr->type != EXPR_SYMBOL) 776 return NULL; 777 778 ret_info.static_returns_call = expr; 779 ret_info.return_type = get_type(expr); 780 ret_info.return_type = get_real_base_type(ret_info.return_type); 781 if (!ret_info.return_type) 782 return NULL; 783 784 run_sql(db_return_callback, &ret_info, 785 "select distinct return from return_states where %s;", 786 get_static_filter(expr->symbol)); 787 788 return ret_info.return_range_list; 789 } 790 791 static void match_call_marker(struct expression *expr) 792 { 793 struct symbol *type; 794 795 type = get_type(expr->fn); 796 if (type && type->type == SYM_PTR) 797 type = get_real_base_type(type); 798 799 /* 800 * we just want to record something in the database so that if we have 801 * two calls like: frob(4); frob(some_unkown); then on the receiving 802 * side we know that sometimes frob is called with unknown parameters. 803 */ 804 805 sql_insert_caller_info(expr, INTERNAL, -1, "%call_marker%", type_to_str(type)); 806 } 807 808 int is_recursive_member(const char *name) 809 { 810 char buf[256]; 811 const char *p, *next; 812 int size; 813 814 p = strchr(name, '>'); 815 if (!p) 816 return 0; 817 p++; 818 while (true) { 819 next = strchr(p, '>'); 820 if (!next) 821 return 0; 822 next++; 823 824 size = next - p; 825 if (size >= sizeof(buf)) 826 return 0; 827 memcpy(buf, p, size); 828 buf[size] = '\0'; 829 if (strstr(next, buf)) 830 return 1; 831 p = next; 832 } 833 } 834 835 char *sm_to_arg_name(struct expression *expr, struct sm_state *sm) 836 { 837 struct symbol *sym; 838 const char *sm_name; 839 char *name; 840 bool is_address = false; 841 bool add_star = false; 842 char buf[256]; 843 char *ret = NULL; 844 int len; 845 846 expr = strip_expr(expr); 847 if (!expr) 848 return NULL; 849 850 if (expr->type == EXPR_PREOP && expr->op == '&') { 851 expr = strip_expr(expr->unop); 852 is_address = true; 853 } 854 855 name = expr_to_var_sym(expr, &sym); 856 if (!name || !sym) 857 goto free; 858 if (sym != sm->sym) 859 goto free; 860 861 sm_name = sm->name; 862 add_star = false; 863 if (sm_name[0] == '*') { 864 add_star = true; 865 sm_name++; 866 } 867 868 len = strlen(name); 869 if (strncmp(name, sm_name, len) != 0) 870 goto free; 871 if (sm_name[len] == '\0') { 872 snprintf(buf, sizeof(buf), "%s%s$", 873 add_star ? "*" : "", is_address ? "*" : ""); 874 } else { 875 if (sm_name[len] != '.' && sm_name[len] != '-') 876 goto free; 877 if (sm_name[len] == '-') 878 len++; 879 // FIXME does is_address really imply that sm_name[len] == '-' 880 snprintf(buf, sizeof(buf), "%s$->%s", add_star ? "*" : "", 881 sm_name + len); 882 } 883 884 ret = alloc_sname(buf); 885 free: 886 free_string(name); 887 return ret; 888 } 889 890 static void print_struct_members(struct expression *call, struct expression *expr, int param, struct stree *stree, 891 void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm), 892 bool new) 893 { 894 struct sm_state *sm; 895 const char *sm_name; 896 char *name; 897 struct symbol *sym; 898 int len; 899 char printed_name[256]; 900 int is_address = 0; 901 bool add_star; 902 struct symbol *type; 903 904 expr = strip_expr(expr); 905 if (!expr) 906 return; 907 type = get_type(expr); 908 if (type && type_bits(type) < type_bits(&ulong_ctype)) 909 return; 910 911 if (expr->type == EXPR_PREOP && expr->op == '&') { 912 expr = strip_expr(expr->unop); 913 is_address = 1; 914 } 915 916 name = expr_to_var_sym(expr, &sym); 917 if (!name || !sym) 918 goto free; 919 920 len = strlen(name); 921 FOR_EACH_SM(stree, sm) { 922 if (sm->sym != sym) 923 continue; 924 sm_name = sm->name; 925 add_star = false; 926 if (sm_name[0] == '*') { 927 add_star = true; 928 sm_name++; 929 } 930 // FIXME: simplify? 931 if (!add_star && strcmp(name, sm_name) == 0) { 932 if (is_address) { 933 snprintf(printed_name, sizeof(printed_name), "*$"); 934 } else { 935 if (new) 936 snprintf(printed_name, sizeof(printed_name), "$"); 937 else 938 continue; 939 } 940 } else if (add_star && strcmp(name, sm_name) == 0) { 941 snprintf(printed_name, sizeof(printed_name), "%s*$", 942 is_address ? "*" : ""); 943 } else if (strncmp(name, sm_name, len) == 0) { 944 if (sm_name[len] != '.' && sm_name[len] != '-') 945 continue; 946 if (is_address && sm_name[len] == '.') { 947 snprintf(printed_name, sizeof(printed_name), 948 "%s$->%s", add_star ? "*" : "", 949 sm_name + len + 1); 950 } else if (is_address && sm_name[len] == '-') { 951 snprintf(printed_name, sizeof(printed_name), 952 "%s(*$)%s", add_star ? "*" : "", 953 sm_name + len); 954 } else { 955 snprintf(printed_name, sizeof(printed_name), 956 "%s$%s", add_star ? "*" : "", 957 sm_name + len); 958 } 959 } else { 960 continue; 961 } 962 if (is_recursive_member(printed_name)) 963 continue; 964 callback(call, param, printed_name, sm); 965 } END_FOR_EACH_SM(sm); 966 free: 967 free_string(name); 968 } 969 970 static void match_call_info(struct expression *call) 971 { 972 struct member_info_callback *cb; 973 struct expression *arg; 974 struct stree *stree; 975 char *name; 976 int i; 977 978 name = get_fnptr_name(call->fn); 979 if (!name) 980 return; 981 982 FOR_EACH_PTR(member_callbacks, cb) { 983 stree = get_all_states_stree(cb->owner); 984 i = 0; 985 FOR_EACH_PTR(call->args, arg) { 986 print_struct_members(call, arg, i, stree, cb->callback, 0); 987 i++; 988 } END_FOR_EACH_PTR(arg); 989 free_stree(&stree); 990 } END_FOR_EACH_PTR(cb); 991 992 free_string(name); 993 } 994 995 static void match_call_info_new(struct expression *call) 996 { 997 struct member_info_callback *cb; 998 struct expression *arg; 999 struct stree *stree; 1000 char *name; 1001 int i; 1002 1003 name = get_fnptr_name(call->fn); 1004 if (!name) 1005 return; 1006 1007 FOR_EACH_PTR(member_callbacks_new, cb) { 1008 stree = get_all_states_stree(cb->owner); 1009 i = 0; 1010 FOR_EACH_PTR(call->args, arg) { 1011 print_struct_members(call, arg, i, stree, cb->callback, 1); 1012 i++; 1013 } END_FOR_EACH_PTR(arg); 1014 free_stree(&stree); 1015 } END_FOR_EACH_PTR(cb); 1016 1017 free_string(name); 1018 } 1019 1020 static int get_param(int param, char **name, struct symbol **sym) 1021 { 1022 struct symbol *arg; 1023 int i; 1024 1025 i = 0; 1026 FOR_EACH_PTR(cur_func_sym->ctype.base_type->arguments, arg) { 1027 /* 1028 * this is a temporary hack to work around a bug (I think in sparse?) 1029 * 2.6.37-rc1:fs/reiserfs/journal.o 1030 * If there is a function definition without parameter name found 1031 * after a function implementation then it causes a crash. 1032 * int foo() {} 1033 * int bar(char *); 1034 */ 1035 if (arg->ident->name < (char *)100) 1036 continue; 1037 if (i == param) { 1038 *name = arg->ident->name; 1039 *sym = arg; 1040 return TRUE; 1041 } 1042 i++; 1043 } END_FOR_EACH_PTR(arg); 1044 1045 return FALSE; 1046 } 1047 1048 static int function_signature_matches(const char *sig) 1049 { 1050 char *my_sig; 1051 1052 my_sig = function_signature(); 1053 if (!sig || !my_sig) 1054 return 1; /* default to matching */ 1055 if (strcmp(my_sig, sig) == 0) 1056 return 1; 1057 return 0; 1058 } 1059 1060 static int caller_info_callback(void *_data, int argc, char **argv, char **azColName) 1061 { 1062 struct select_caller_info_data *data = _data; 1063 int func_id; 1064 long type; 1065 long param; 1066 char *key; 1067 char *value; 1068 char *name = NULL; 1069 struct symbol *sym = NULL; 1070 struct def_callback *def_callback; 1071 struct stree *stree; 1072 struct timeval cur_time; 1073 1074 data->results = 1; 1075 1076 if (argc != 5) 1077 return 0; 1078 1079 gettimeofday(&cur_time, NULL); 1080 if (cur_time.tv_sec - data->start_time.tv_sec > 10) 1081 return 0; 1082 1083 func_id = atoi(argv[0]); 1084 errno = 0; 1085 type = strtol(argv[1], NULL, 10); 1086 param = strtol(argv[2], NULL, 10); 1087 if (errno) 1088 return 0; 1089 key = argv[3]; 1090 value = argv[4]; 1091 1092 if (data->prev_func_id == -1) 1093 data->prev_func_id = func_id; 1094 if (func_id != data->prev_func_id) { 1095 stree = __pop_fake_cur_stree(); 1096 if (!data->ignore) 1097 merge_stree(&data->final_states, stree); 1098 free_stree(&stree); 1099 __push_fake_cur_stree(); 1100 __unnullify_path(); 1101 data->prev_func_id = func_id; 1102 data->ignore = 0; 1103 } 1104 1105 if (data->ignore) 1106 return 0; 1107 if (type == INTERNAL && 1108 !function_signature_matches(value)) { 1109 data->ignore = 1; 1110 return 0; 1111 } 1112 1113 if (param >= 0 && !get_param(param, &name, &sym)) 1114 return 0; 1115 1116 FOR_EACH_PTR(select_caller_info_callbacks, def_callback) { 1117 if (def_callback->hook_type == type) 1118 def_callback->callback(name, sym, key, value); 1119 } END_FOR_EACH_PTR(def_callback); 1120 1121 return 0; 1122 } 1123 1124 static struct string_list *ptr_names_done; 1125 static struct string_list *ptr_names; 1126 1127 static int get_ptr_name(void *unused, int argc, char **argv, char **azColName) 1128 { 1129 insert_string(&ptr_names, alloc_string(argv[0])); 1130 return 0; 1131 } 1132 1133 static char *get_next_ptr_name(void) 1134 { 1135 char *ptr; 1136 1137 FOR_EACH_PTR(ptr_names, ptr) { 1138 if (!insert_string(&ptr_names_done, ptr)) 1139 continue; 1140 return ptr; 1141 } END_FOR_EACH_PTR(ptr); 1142 return NULL; 1143 } 1144 1145 static void get_ptr_names(const char *file, const char *name) 1146 { 1147 char sql_filter[1024]; 1148 int before, after; 1149 1150 if (file) { 1151 snprintf(sql_filter, 1024, "file = '%s' and function = '%s';", 1152 file, name); 1153 } else { 1154 snprintf(sql_filter, 1024, "function = '%s';", name); 1155 } 1156 1157 before = ptr_list_size((struct ptr_list *)ptr_names); 1158 1159 run_sql(get_ptr_name, NULL, 1160 "select distinct ptr from function_ptr where %s", 1161 sql_filter); 1162 1163 after = ptr_list_size((struct ptr_list *)ptr_names); 1164 if (before == after) 1165 return; 1166 1167 while ((name = get_next_ptr_name())) 1168 get_ptr_names(NULL, name); 1169 } 1170 1171 static void match_data_from_db(struct symbol *sym) 1172 { 1173 struct select_caller_info_data data = { .prev_func_id = -1 }; 1174 struct sm_state *sm; 1175 struct stree *stree; 1176 struct timeval end_time; 1177 1178 if (!sym || !sym->ident) 1179 return; 1180 1181 set_fn_mtag(sym); 1182 gettimeofday(&data.start_time, NULL); 1183 1184 __push_fake_cur_stree(); 1185 __unnullify_path(); 1186 1187 if (!__inline_fn) { 1188 char *ptr; 1189 1190 if (sym->ctype.modifiers & MOD_STATIC) 1191 get_ptr_names(get_base_file(), sym->ident->name); 1192 else 1193 get_ptr_names(NULL, sym->ident->name); 1194 1195 if (ptr_list_size((struct ptr_list *)ptr_names) > 20) { 1196 __free_ptr_list((struct ptr_list **)&ptr_names); 1197 __free_ptr_list((struct ptr_list **)&ptr_names_done); 1198 __free_fake_cur_stree(); 1199 return; 1200 } 1201 1202 sql_select_caller_info(&data, 1203 "call_id, type, parameter, key, value", 1204 sym); 1205 1206 1207 stree = __pop_fake_cur_stree(); 1208 if (!data.ignore) 1209 merge_stree(&data.final_states, stree); 1210 free_stree(&stree); 1211 __push_fake_cur_stree(); 1212 __unnullify_path(); 1213 data.prev_func_id = -1; 1214 data.ignore = 0; 1215 data.results = 0; 1216 1217 FOR_EACH_PTR(ptr_names, ptr) { 1218 run_sql(caller_info_callback, &data, 1219 "select call_id, type, parameter, key, value" 1220 " from common_caller_info where function = '%s' order by call_id", 1221 ptr); 1222 } END_FOR_EACH_PTR(ptr); 1223 1224 if (data.results) { 1225 FOR_EACH_PTR(ptr_names, ptr) { 1226 free_string(ptr); 1227 } END_FOR_EACH_PTR(ptr); 1228 goto free_ptr_names; 1229 } 1230 1231 FOR_EACH_PTR(ptr_names, ptr) { 1232 run_sql(caller_info_callback, &data, 1233 "select call_id, type, parameter, key, value" 1234 " from caller_info where function = '%s' order by call_id", 1235 ptr); 1236 free_string(ptr); 1237 } END_FOR_EACH_PTR(ptr); 1238 1239 free_ptr_names: 1240 __free_ptr_list((struct ptr_list **)&ptr_names); 1241 __free_ptr_list((struct ptr_list **)&ptr_names_done); 1242 } else { 1243 sql_select_caller_info(&data, 1244 "call_id, type, parameter, key, value", 1245 sym); 1246 } 1247 1248 stree = __pop_fake_cur_stree(); 1249 if (!data.ignore) 1250 merge_stree(&data.final_states, stree); 1251 free_stree(&stree); 1252 1253 gettimeofday(&end_time, NULL); 1254 if (end_time.tv_sec - data.start_time.tv_sec <= 10) { 1255 FOR_EACH_SM(data.final_states, sm) { 1256 __set_sm(sm); 1257 } END_FOR_EACH_SM(sm); 1258 } 1259 1260 free_stree(&data.final_states); 1261 } 1262 1263 static int return_implies_callbacks(void *_info, int argc, char **argv, char **azColName) 1264 { 1265 struct implies_info *info = _info; 1266 struct db_implies_callback *cb; 1267 struct expression *arg = NULL; 1268 int type; 1269 int param; 1270 1271 if (argc != 5) 1272 return 0; 1273 1274 type = atoi(argv[1]); 1275 param = atoi(argv[2]); 1276 1277 FOR_EACH_PTR(info->cb_list, cb) { 1278 if (cb->type != type) 1279 continue; 1280 if (param != -1) { 1281 arg = get_argument_from_call_expr(info->expr->args, param); 1282 if (!arg) 1283 continue; 1284 } 1285 cb->callback(info->expr, arg, argv[3], argv[4]); 1286 } END_FOR_EACH_PTR(cb); 1287 1288 return 0; 1289 } 1290 1291 static int call_implies_callbacks(void *_info, int argc, char **argv, char **azColName) 1292 { 1293 struct implies_info *info = _info; 1294 struct db_implies_callback *cb; 1295 struct expression *arg; 1296 struct symbol *sym; 1297 char *name; 1298 int type; 1299 int param; 1300 1301 if (argc != 5) 1302 return 0; 1303 1304 type = atoi(argv[1]); 1305 param = atoi(argv[2]); 1306 1307 if (!get_param(param, &name, &sym)) 1308 return 0; 1309 arg = symbol_expression(sym); 1310 if (!arg) 1311 return 0; 1312 1313 FOR_EACH_PTR(info->cb_list, cb) { 1314 if (cb->type != type) 1315 continue; 1316 cb->callback(info->expr, arg, argv[3], argv[4]); 1317 } END_FOR_EACH_PTR(cb); 1318 1319 return 0; 1320 } 1321 1322 static void match_return_implies(struct expression *expr) 1323 { 1324 struct implies_info info = { 1325 .type = RETURN_IMPLIES, 1326 .cb_list = return_implies_cb_list, 1327 }; 1328 1329 if (expr->fn->type != EXPR_SYMBOL || 1330 !expr->fn->symbol) 1331 return; 1332 info.expr = expr; 1333 info.sym = expr->fn->symbol; 1334 sql_select_implies("function, type, parameter, key, value", &info, 1335 return_implies_callbacks); 1336 } 1337 1338 static void match_call_implies(struct symbol *sym) 1339 { 1340 struct implies_info info = { 1341 .type = CALL_IMPLIES, 1342 .cb_list = call_implies_cb_list, 1343 }; 1344 1345 if (!sym || !sym->ident) 1346 return; 1347 1348 info.sym = sym; 1349 sql_select_implies("function, type, parameter, key, value", &info, 1350 call_implies_callbacks); 1351 } 1352 1353 static char *get_fn_param_str(struct expression *expr) 1354 { 1355 struct expression *tmp; 1356 int param; 1357 char buf[32]; 1358 1359 tmp = get_assigned_expr(expr); 1360 if (tmp) 1361 expr = tmp; 1362 expr = strip_expr(expr); 1363 if (!expr || expr->type != EXPR_CALL) 1364 return NULL; 1365 expr = strip_expr(expr->fn); 1366 if (!expr || expr->type != EXPR_SYMBOL) 1367 return NULL; 1368 param = get_param_num(expr); 1369 if (param < 0) 1370 return NULL; 1371 1372 snprintf(buf, sizeof(buf), "[r $%d]", param); 1373 return alloc_sname(buf); 1374 } 1375 1376 static char *get_return_compare_is_param(struct expression *expr) 1377 { 1378 char *var; 1379 char buf[256]; 1380 int comparison; 1381 int param; 1382 1383 param = get_param_num(expr); 1384 if (param < 0) 1385 return NULL; 1386 1387 var = expr_to_var(expr); 1388 if (!var) 1389 return NULL; 1390 snprintf(buf, sizeof(buf), "%s orig", var); 1391 comparison = get_comparison_strings(var, buf); 1392 free_string(var); 1393 1394 if (!comparison) 1395 return NULL; 1396 1397 snprintf(buf, sizeof(buf), "[%s$%d]", show_special(comparison), param); 1398 return alloc_sname(buf); 1399 } 1400 1401 static char *get_return_compare_str(struct expression *expr) 1402 { 1403 char *compare_str; 1404 1405 compare_str = get_return_compare_is_param(expr); 1406 if (compare_str) 1407 return compare_str; 1408 1409 compare_str = expr_lte_to_param(expr, -1); 1410 if (compare_str) 1411 return compare_str; 1412 1413 return expr_param_comparison(expr, -1); 1414 } 1415 1416 static const char *get_return_ranges_str(struct expression *expr, struct range_list **rl_p) 1417 { 1418 struct range_list *rl; 1419 char *return_ranges; 1420 sval_t sval; 1421 char *fn_param_str; 1422 char *compare_str; 1423 char *math_str; 1424 char buf[128]; 1425 1426 *rl_p = NULL; 1427 1428 if (!expr) 1429 return alloc_sname(""); 1430 1431 if (get_implied_value(expr, &sval)) { 1432 sval = sval_cast(cur_func_return_type(), sval); 1433 *rl_p = alloc_rl(sval, sval); 1434 return sval_to_str_or_err_ptr(sval); 1435 } 1436 1437 fn_param_str = get_fn_param_str(expr); 1438 compare_str = expr_equal_to_param(expr, -1); 1439 math_str = get_value_in_terms_of_parameter_math(expr); 1440 1441 if (get_implied_rl(expr, &rl) && !is_whole_rl(rl)) { 1442 rl = cast_rl(cur_func_return_type(), rl); 1443 return_ranges = show_rl(rl); 1444 } else if (get_imaginary_absolute(expr, &rl)){ 1445 rl = cast_rl(cur_func_return_type(), rl); 1446 return alloc_sname(show_rl(rl)); 1447 } else { 1448 get_absolute_rl(expr, &rl); 1449 rl = cast_rl(cur_func_return_type(), rl); 1450 return_ranges = show_rl(rl); 1451 } 1452 *rl_p = rl; 1453 1454 if (fn_param_str) { 1455 snprintf(buf, sizeof(buf), "%s%s", return_ranges, fn_param_str); 1456 return alloc_sname(buf); 1457 } 1458 if (compare_str) { 1459 snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str); 1460 return alloc_sname(buf); 1461 } 1462 if (math_str) { 1463 snprintf(buf, sizeof(buf), "%s[%s]", return_ranges, math_str); 1464 return alloc_sname(buf); 1465 } 1466 compare_str = get_return_compare_str(expr); 1467 if (compare_str) { 1468 snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str); 1469 return alloc_sname(buf); 1470 } 1471 1472 return return_ranges; 1473 } 1474 1475 static void match_return_info(int return_id, char *return_ranges, struct expression *expr) 1476 { 1477 sql_insert_return_states(return_id, return_ranges, INTERNAL, -1, "", function_signature()); 1478 } 1479 1480 static bool call_return_state_hooks_conditional(struct expression *expr) 1481 { 1482 int final_pass_orig = final_pass; 1483 static int recurse; 1484 1485 if (recurse >= 2) 1486 return false; 1487 if (!expr || 1488 (expr->type != EXPR_CONDITIONAL && expr->type != EXPR_SELECT)) 1489 return false; 1490 1491 recurse++; 1492 1493 __push_fake_cur_stree(); 1494 1495 final_pass = 0; 1496 __split_whole_condition(expr->conditional); 1497 final_pass = final_pass_orig; 1498 1499 call_return_state_hooks(expr->cond_true ?: expr->conditional); 1500 1501 __push_true_states(); 1502 __use_false_states(); 1503 1504 call_return_state_hooks(expr->cond_false); 1505 1506 __merge_true_states(); 1507 __free_fake_cur_stree(); 1508 1509 recurse--; 1510 return true; 1511 } 1512 1513 static void call_return_state_hooks_compare(struct expression *expr) 1514 { 1515 struct returned_state_callback *cb; 1516 char *return_ranges; 1517 int final_pass_orig = final_pass; 1518 sval_t sval = { .type = &int_ctype }; 1519 sval_t ret; 1520 1521 if (!get_implied_value(expr, &ret)) 1522 ret.value = -1; 1523 1524 __push_fake_cur_stree(); 1525 1526 final_pass = 0; 1527 __split_whole_condition(expr); 1528 final_pass = final_pass_orig; 1529 1530 if (ret.value != 0) { 1531 return_ranges = alloc_sname("1"); 1532 sval.value = 1; 1533 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_sval(sval)); 1534 1535 return_id++; 1536 FOR_EACH_PTR(returned_state_callbacks, cb) { 1537 cb->callback(return_id, return_ranges, expr); 1538 } END_FOR_EACH_PTR(cb); 1539 } 1540 1541 __push_true_states(); 1542 __use_false_states(); 1543 1544 if (ret.value != 1) { 1545 return_ranges = alloc_sname("0"); 1546 sval.value = 0; 1547 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_sval(sval)); 1548 1549 return_id++; 1550 FOR_EACH_PTR(returned_state_callbacks, cb) { 1551 cb->callback(return_id, return_ranges, expr); 1552 } END_FOR_EACH_PTR(cb); 1553 } 1554 1555 __merge_true_states(); 1556 __free_fake_cur_stree(); 1557 } 1558 1559 static int ptr_in_list(struct sm_state *sm, struct state_list *slist) 1560 { 1561 struct sm_state *tmp; 1562 1563 FOR_EACH_PTR(slist, tmp) { 1564 if (strcmp(tmp->state->name, sm->state->name) == 0) 1565 return 1; 1566 } END_FOR_EACH_PTR(tmp); 1567 1568 return 0; 1569 } 1570 1571 static int split_possible_helper(struct sm_state *sm, struct expression *expr) 1572 { 1573 struct returned_state_callback *cb; 1574 struct range_list *rl; 1575 char *return_ranges; 1576 struct sm_state *tmp; 1577 int ret = 0; 1578 int nr_possible, nr_states; 1579 char *compare_str; 1580 char buf[128]; 1581 struct state_list *already_handled = NULL; 1582 sval_t sval; 1583 1584 if (!sm || !sm->merged) 1585 return 0; 1586 1587 if (too_many_possible(sm)) 1588 return 0; 1589 1590 /* bail if it gets too complicated */ 1591 nr_possible = 0; 1592 FOR_EACH_PTR(sm->possible, tmp) { 1593 if (tmp->merged) 1594 continue; 1595 if (ptr_in_list(tmp, already_handled)) 1596 continue; 1597 add_ptr_list(&already_handled, tmp); 1598 nr_possible++; 1599 } END_FOR_EACH_PTR(tmp); 1600 free_slist(&already_handled); 1601 nr_states = get_db_state_count(); 1602 if (nr_states * nr_possible >= 2000) 1603 return 0; 1604 1605 FOR_EACH_PTR(sm->possible, tmp) { 1606 if (tmp->merged) 1607 continue; 1608 if (ptr_in_list(tmp, already_handled)) 1609 continue; 1610 add_ptr_list(&already_handled, tmp); 1611 1612 ret = 1; 1613 __push_fake_cur_stree(); 1614 1615 overwrite_states_using_pool(sm, tmp); 1616 1617 rl = cast_rl(cur_func_return_type(), estate_rl(tmp->state)); 1618 return_ranges = show_rl(rl); 1619 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(clone_rl(rl))); 1620 if (!rl_to_sval(rl, &sval)) { 1621 compare_str = get_return_compare_str(expr); 1622 if (compare_str) { 1623 snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str); 1624 return_ranges = alloc_sname(buf); 1625 } 1626 } 1627 1628 return_id++; 1629 FOR_EACH_PTR(returned_state_callbacks, cb) { 1630 cb->callback(return_id, return_ranges, expr); 1631 } END_FOR_EACH_PTR(cb); 1632 1633 __free_fake_cur_stree(); 1634 } END_FOR_EACH_PTR(tmp); 1635 1636 free_slist(&already_handled); 1637 1638 return ret; 1639 } 1640 1641 static int call_return_state_hooks_split_possible(struct expression *expr) 1642 { 1643 struct sm_state *sm; 1644 1645 if (!expr) 1646 return 0; 1647 1648 sm = get_sm_state_expr(SMATCH_EXTRA, expr); 1649 return split_possible_helper(sm, expr); 1650 } 1651 1652 static bool has_possible_negative(struct sm_state *sm) 1653 { 1654 struct sm_state *tmp; 1655 1656 if (!type_signed(estate_type(sm->state))) 1657 return false; 1658 1659 FOR_EACH_PTR(sm->possible, tmp) { 1660 if (!estate_rl(tmp->state)) 1661 continue; 1662 if (sval_is_negative(estate_min(tmp->state)) && 1663 sval_is_negative(estate_max(tmp->state))) 1664 return true; 1665 } END_FOR_EACH_PTR(tmp); 1666 1667 return false; 1668 } 1669 1670 static bool has_separate_zero_null(struct sm_state *sm) 1671 { 1672 struct sm_state *tmp; 1673 sval_t sval; 1674 1675 FOR_EACH_PTR(sm->possible, tmp) { 1676 if (!estate_get_single_value(tmp->state, &sval)) 1677 continue; 1678 if (sval.value == 0) 1679 return true; 1680 } END_FOR_EACH_PTR(tmp); 1681 1682 return false; 1683 } 1684 1685 static int split_positive_from_negative(struct expression *expr) 1686 { 1687 struct sm_state *sm; 1688 struct returned_state_callback *cb; 1689 struct range_list *rl; 1690 const char *return_ranges; 1691 struct range_list *ret_rl; 1692 bool separate_zero; 1693 int undo; 1694 1695 /* We're going to print the states 3 times */ 1696 if (get_db_state_count() > 10000 / 3) 1697 return 0; 1698 1699 if (!get_implied_rl(expr, &rl) || !rl) 1700 return 0; 1701 /* Forget about INT_MAX and larger */ 1702 if (rl_max(rl).value <= 0) 1703 return 0; 1704 if (!sval_is_negative(rl_min(rl))) 1705 return 0; 1706 1707 sm = get_sm_state_expr(SMATCH_EXTRA, expr); 1708 if (!sm) 1709 return 0; 1710 if (!has_possible_negative(sm)) 1711 return 0; 1712 separate_zero = has_separate_zero_null(sm); 1713 1714 if (!assume(compare_expression(expr, separate_zero ? '>' : SPECIAL_GTE, zero_expr()))) 1715 return 0; 1716 1717 return_id++; 1718 return_ranges = get_return_ranges_str(expr, &ret_rl); 1719 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl)); 1720 FOR_EACH_PTR(returned_state_callbacks, cb) { 1721 cb->callback(return_id, (char *)return_ranges, expr); 1722 } END_FOR_EACH_PTR(cb); 1723 1724 end_assume(); 1725 1726 if (separate_zero) { 1727 undo = assume(compare_expression(expr, SPECIAL_EQUAL, zero_expr())); 1728 1729 return_id++; 1730 return_ranges = get_return_ranges_str(expr, &ret_rl); 1731 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl)); 1732 FOR_EACH_PTR(returned_state_callbacks, cb) { 1733 cb->callback(return_id, (char *)return_ranges, expr); 1734 } END_FOR_EACH_PTR(cb); 1735 1736 if (undo) 1737 end_assume(); 1738 } 1739 1740 undo = assume(compare_expression(expr, '<', zero_expr())); 1741 1742 return_id++; 1743 return_ranges = get_return_ranges_str(expr, &ret_rl); 1744 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl)); 1745 FOR_EACH_PTR(returned_state_callbacks, cb) { 1746 cb->callback(return_id, (char *)return_ranges, expr); 1747 } END_FOR_EACH_PTR(cb); 1748 1749 if (undo) 1750 end_assume(); 1751 1752 return 1; 1753 } 1754 1755 static int call_return_state_hooks_split_null_non_null_zero(struct expression *expr) 1756 { 1757 struct returned_state_callback *cb; 1758 struct range_list *rl; 1759 struct range_list *nonnull_rl; 1760 sval_t null_sval; 1761 struct range_list *null_rl = NULL; 1762 char *return_ranges; 1763 struct sm_state *sm; 1764 struct smatch_state *state; 1765 int nr_states; 1766 int final_pass_orig = final_pass; 1767 1768 if (!expr || expr_equal_to_param(expr, -1)) 1769 return 0; 1770 if (expr->type == EXPR_CALL) 1771 return 0; 1772 1773 sm = get_sm_state_expr(SMATCH_EXTRA, expr); 1774 if (!sm) 1775 return 0; 1776 if (ptr_list_size((struct ptr_list *)sm->possible) == 1) 1777 return 0; 1778 state = sm->state; 1779 if (!estate_rl(state)) 1780 return 0; 1781 if (estate_min(state).value == 0 && estate_max(state).value == 0) 1782 return 0; 1783 if (has_possible_negative(sm)) 1784 return 0; 1785 if (!has_separate_zero_null(sm)) 1786 return 0; 1787 1788 nr_states = get_db_state_count(); 1789 if (option_info && nr_states >= 1500) 1790 return 0; 1791 1792 rl = estate_rl(state); 1793 1794 __push_fake_cur_stree(); 1795 1796 final_pass = 0; 1797 __split_whole_condition(expr); 1798 final_pass = final_pass_orig; 1799 1800 nonnull_rl = rl_filter(rl, rl_zero()); 1801 return_ranges = show_rl(nonnull_rl); 1802 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(nonnull_rl)); 1803 1804 return_id++; 1805 FOR_EACH_PTR(returned_state_callbacks, cb) { 1806 cb->callback(return_id, return_ranges, expr); 1807 } END_FOR_EACH_PTR(cb); 1808 1809 __push_true_states(); 1810 __use_false_states(); 1811 1812 return_ranges = alloc_sname("0"); 1813 null_sval = sval_type_val(rl_type(rl), 0); 1814 add_range(&null_rl, null_sval, null_sval); 1815 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(null_rl)); 1816 return_id++; 1817 FOR_EACH_PTR(returned_state_callbacks, cb) { 1818 cb->callback(return_id, return_ranges, expr); 1819 } END_FOR_EACH_PTR(cb); 1820 1821 __merge_true_states(); 1822 __free_fake_cur_stree(); 1823 1824 return 1; 1825 } 1826 1827 static bool is_kernel_success_fail(struct sm_state *sm) 1828 { 1829 struct sm_state *tmp; 1830 struct range_list *rl; 1831 bool has_zero = false; 1832 bool has_neg = false; 1833 1834 if (!type_signed(estate_type(sm->state))) 1835 return false; 1836 1837 FOR_EACH_PTR(sm->possible, tmp) { 1838 rl = estate_rl(tmp->state); 1839 if (!rl) 1840 return false; 1841 if (rl_min(rl).value == 0 && rl_max(rl).value == 0) { 1842 has_zero = true; 1843 continue; 1844 } 1845 has_neg = true; 1846 if (rl_min(rl).value >= -4095 && rl_max(rl).value < 0) 1847 continue; 1848 if (strcmp(tmp->state->name, "s32min-(-1)") == 0) 1849 continue; 1850 if (strcmp(tmp->state->name, "s32min-(-1),1-s32max") == 0) 1851 continue; 1852 return false; 1853 } END_FOR_EACH_PTR(tmp); 1854 1855 return has_zero && has_neg; 1856 } 1857 1858 static int call_return_state_hooks_split_success_fail(struct expression *expr) 1859 { 1860 struct sm_state *sm; 1861 struct range_list *rl; 1862 struct range_list *nonzero_rl; 1863 sval_t zero_sval; 1864 struct range_list *zero_rl = NULL; 1865 int nr_states; 1866 struct returned_state_callback *cb; 1867 char *return_ranges; 1868 int final_pass_orig = final_pass; 1869 1870 if (option_project != PROJ_KERNEL) 1871 return 0; 1872 1873 nr_states = get_db_state_count(); 1874 if (nr_states > 2000) 1875 return 0; 1876 1877 sm = get_sm_state_expr(SMATCH_EXTRA, expr); 1878 if (!sm) 1879 return 0; 1880 if (ptr_list_size((struct ptr_list *)sm->possible) == 1) 1881 return 0; 1882 if (!is_kernel_success_fail(sm)) 1883 return 0; 1884 1885 rl = estate_rl(sm->state); 1886 if (!rl) 1887 return 0; 1888 1889 __push_fake_cur_stree(); 1890 1891 final_pass = 0; 1892 __split_whole_condition(expr); 1893 final_pass = final_pass_orig; 1894 1895 nonzero_rl = rl_filter(rl, rl_zero()); 1896 nonzero_rl = cast_rl(cur_func_return_type(), nonzero_rl); 1897 return_ranges = show_rl(nonzero_rl); 1898 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(nonzero_rl)); 1899 1900 return_id++; 1901 FOR_EACH_PTR(returned_state_callbacks, cb) { 1902 cb->callback(return_id, return_ranges, expr); 1903 } END_FOR_EACH_PTR(cb); 1904 1905 __push_true_states(); 1906 __use_false_states(); 1907 1908 return_ranges = alloc_sname("0"); 1909 zero_sval = sval_type_val(rl_type(rl), 0); 1910 add_range(&zero_rl, zero_sval, zero_sval); 1911 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(zero_rl)); 1912 return_id++; 1913 FOR_EACH_PTR(returned_state_callbacks, cb) { 1914 cb->callback(return_id, return_ranges, expr); 1915 } END_FOR_EACH_PTR(cb); 1916 1917 __merge_true_states(); 1918 __free_fake_cur_stree(); 1919 1920 return 1; 1921 } 1922 1923 static int is_boolean(struct expression *expr) 1924 { 1925 struct range_list *rl; 1926 1927 if (!get_implied_rl(expr, &rl)) 1928 return 0; 1929 if (rl_min(rl).value == 0 && rl_max(rl).value == 1) 1930 return 1; 1931 return 0; 1932 } 1933 1934 static int splitable_function_call(struct expression *expr) 1935 { 1936 struct sm_state *sm; 1937 char buf[64]; 1938 1939 if (!expr || expr->type != EXPR_CALL) 1940 return 0; 1941 snprintf(buf, sizeof(buf), "return %p", expr); 1942 sm = get_sm_state(SMATCH_EXTRA, buf, NULL); 1943 return split_possible_helper(sm, expr); 1944 } 1945 1946 static struct sm_state *find_bool_param(void) 1947 { 1948 struct stree *start_states; 1949 struct symbol *arg; 1950 struct sm_state *sm, *tmp; 1951 sval_t sval; 1952 1953 start_states = get_start_states(); 1954 1955 FOR_EACH_PTR_REVERSE(cur_func_sym->ctype.base_type->arguments, arg) { 1956 if (!arg->ident) 1957 continue; 1958 sm = get_sm_state_stree(start_states, SMATCH_EXTRA, arg->ident->name, arg); 1959 if (!sm) 1960 continue; 1961 if (rl_min(estate_rl(sm->state)).value != 0 || 1962 rl_max(estate_rl(sm->state)).value != 1) 1963 continue; 1964 goto found; 1965 } END_FOR_EACH_PTR_REVERSE(arg); 1966 1967 return NULL; 1968 1969 found: 1970 /* 1971 * Check if it's splitable. If not, then splitting it up is likely not 1972 * useful for the callers. 1973 */ 1974 FOR_EACH_PTR(sm->possible, tmp) { 1975 if (is_merged(tmp)) 1976 continue; 1977 if (!estate_get_single_value(tmp->state, &sval)) 1978 return NULL; 1979 } END_FOR_EACH_PTR(tmp); 1980 1981 return sm; 1982 } 1983 1984 static int split_on_bool_sm(struct sm_state *sm, struct expression *expr) 1985 { 1986 struct returned_state_callback *cb; 1987 struct range_list *ret_rl; 1988 const char *return_ranges; 1989 struct sm_state *tmp; 1990 int ret = 0; 1991 struct state_list *already_handled = NULL; 1992 1993 if (!sm || !sm->merged) 1994 return 0; 1995 1996 if (too_many_possible(sm)) 1997 return 0; 1998 1999 FOR_EACH_PTR(sm->possible, tmp) { 2000 if (tmp->merged) 2001 continue; 2002 if (ptr_in_list(tmp, already_handled)) 2003 continue; 2004 add_ptr_list(&already_handled, tmp); 2005 2006 ret = 1; 2007 __push_fake_cur_stree(); 2008 2009 overwrite_states_using_pool(sm, tmp); 2010 2011 return_ranges = get_return_ranges_str(expr, &ret_rl); 2012 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl)); 2013 return_id++; 2014 FOR_EACH_PTR(returned_state_callbacks, cb) { 2015 cb->callback(return_id, (char *)return_ranges, expr); 2016 } END_FOR_EACH_PTR(cb); 2017 2018 __free_fake_cur_stree(); 2019 } END_FOR_EACH_PTR(tmp); 2020 2021 free_slist(&already_handled); 2022 2023 return ret; 2024 } 2025 2026 static int split_by_bool_param(struct expression *expr) 2027 { 2028 struct sm_state *start_sm, *sm; 2029 sval_t sval; 2030 2031 start_sm = find_bool_param(); 2032 if (!start_sm) 2033 return 0; 2034 sm = get_sm_state(SMATCH_EXTRA, start_sm->name, start_sm->sym); 2035 if (!sm || estate_get_single_value(sm->state, &sval)) 2036 return 0; 2037 2038 if (get_db_state_count() * 2 >= 2000) 2039 return 0; 2040 2041 return split_on_bool_sm(sm, expr); 2042 } 2043 2044 static int split_by_null_nonnull_param(struct expression *expr) 2045 { 2046 struct symbol *arg; 2047 struct sm_state *sm; 2048 int nr_possible; 2049 2050 /* function must only take one pointer */ 2051 if (ptr_list_size((struct ptr_list *)cur_func_sym->ctype.base_type->arguments) != 1) 2052 return 0; 2053 arg = first_ptr_list((struct ptr_list *)cur_func_sym->ctype.base_type->arguments); 2054 if (!arg->ident) 2055 return 0; 2056 if (get_real_base_type(arg)->type != SYM_PTR) 2057 return 0; 2058 2059 if (param_was_set_var_sym(arg->ident->name, arg)) 2060 return 0; 2061 sm = get_sm_state(SMATCH_EXTRA, arg->ident->name, arg); 2062 if (!sm) 2063 return 0; 2064 2065 if (!has_separate_zero_null(sm)) 2066 return 0; 2067 2068 nr_possible = ptr_list_size((struct ptr_list *)sm->possible); 2069 if (get_db_state_count() * nr_possible >= 2000) 2070 return 0; 2071 2072 return split_on_bool_sm(sm, expr); 2073 } 2074 2075 struct expression *strip_expr_statement(struct expression *expr) 2076 { 2077 struct expression *orig = expr; 2078 struct statement *stmt, *last_stmt; 2079 2080 if (!expr) 2081 return NULL; 2082 if (expr->type == EXPR_PREOP && expr->op == '(') 2083 expr = expr->unop; 2084 if (expr->type != EXPR_STATEMENT) 2085 return orig; 2086 stmt = expr->statement; 2087 if (!stmt || stmt->type != STMT_COMPOUND) 2088 return orig; 2089 2090 last_stmt = last_ptr_list((struct ptr_list *)stmt->stmts); 2091 if (!last_stmt || last_stmt->type == STMT_LABEL) 2092 last_stmt = last_stmt->label_statement; 2093 if (!last_stmt || last_stmt->type != STMT_EXPRESSION) 2094 return orig; 2095 return strip_expr(last_stmt->expression); 2096 } 2097 2098 static bool is_kernel_error_path(struct expression *expr) 2099 { 2100 struct range_list *rl; 2101 2102 /* 2103 * Splitting up returns requires resources. It also requires resources 2104 * for the caller. It doesn't seem worth it to split anything up. 2105 */ 2106 if (!get_implied_rl(expr, &rl)) 2107 return false; 2108 if (rl_type(rl) != &int_ctype) 2109 return false; 2110 if (rl_min(rl).value >= -4095 && 2111 rl_max(rl).value < 0) 2112 return true; 2113 return false; 2114 } 2115 2116 static void call_return_state_hooks(struct expression *expr) 2117 { 2118 struct returned_state_callback *cb; 2119 struct range_list *ret_rl; 2120 const char *return_ranges; 2121 int nr_states; 2122 sval_t sval; 2123 2124 if (__path_is_null()) 2125 return; 2126 2127 expr = strip_expr(expr); 2128 expr = strip_expr_statement(expr); 2129 2130 if (is_impossible_path()) 2131 goto vanilla; 2132 2133 if (expr && (expr->type == EXPR_COMPARE || 2134 !get_implied_value(expr, &sval)) && 2135 (is_condition(expr) || is_boolean(expr))) { 2136 call_return_state_hooks_compare(expr); 2137 return; 2138 } else if (call_return_state_hooks_conditional(expr)) { 2139 return; 2140 } else if (is_kernel_error_path(expr)) { 2141 goto vanilla; 2142 } else if (call_return_state_hooks_split_possible(expr)) { 2143 return; 2144 } else if (split_positive_from_negative(expr)) { 2145 return; 2146 } else if (call_return_state_hooks_split_null_non_null_zero(expr)) { 2147 return; 2148 } else if (call_return_state_hooks_split_success_fail(expr)) { 2149 return; 2150 } else if (splitable_function_call(expr)) { 2151 return; 2152 } else if (split_by_bool_param(expr)) { 2153 } else if (split_by_null_nonnull_param(expr)) { 2154 return; 2155 } 2156 2157 vanilla: 2158 return_ranges = get_return_ranges_str(expr, &ret_rl); 2159 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl)); 2160 2161 return_id++; 2162 nr_states = get_db_state_count(); 2163 if (nr_states >= 10000) { 2164 match_return_info(return_id, (char *)return_ranges, expr); 2165 print_limited_param_set(return_id, (char *)return_ranges, expr); 2166 mark_all_params_untracked(return_id, (char *)return_ranges, expr); 2167 return; 2168 } 2169 FOR_EACH_PTR(returned_state_callbacks, cb) { 2170 cb->callback(return_id, (char *)return_ranges, expr); 2171 } END_FOR_EACH_PTR(cb); 2172 } 2173 2174 static void print_returned_struct_members(int return_id, char *return_ranges, struct expression *expr) 2175 { 2176 struct returned_member_callback *cb; 2177 struct stree *stree; 2178 struct sm_state *sm; 2179 struct symbol *type; 2180 char *name; 2181 char member_name[256]; 2182 int len; 2183 2184 type = get_type(expr); 2185 if (!type || type->type != SYM_PTR) 2186 return; 2187 name = expr_to_var(expr); 2188 if (!name) 2189 return; 2190 2191 member_name[sizeof(member_name) - 1] = '\0'; 2192 strcpy(member_name, "$"); 2193 2194 len = strlen(name); 2195 FOR_EACH_PTR(returned_member_callbacks, cb) { 2196 stree = __get_cur_stree(); 2197 FOR_EACH_MY_SM(cb->owner, stree, sm) { 2198 if (sm->name[0] == '*' && strcmp(sm->name + 1, name) == 0) { 2199 strcpy(member_name, "*$"); 2200 cb->callback(return_id, return_ranges, expr, member_name, sm->state); 2201 continue; 2202 } 2203 if (strncmp(sm->name, name, len) != 0) 2204 continue; 2205 if (strncmp(sm->name + len, "->", 2) != 0) 2206 continue; 2207 snprintf(member_name, sizeof(member_name), "$%s", sm->name + len); 2208 cb->callback(return_id, return_ranges, expr, member_name, sm->state); 2209 } END_FOR_EACH_SM(sm); 2210 } END_FOR_EACH_PTR(cb); 2211 2212 free_string(name); 2213 } 2214 2215 static void reset_memdb(struct symbol *sym) 2216 { 2217 mem_sql(NULL, NULL, "delete from caller_info;"); 2218 mem_sql(NULL, NULL, "delete from return_states;"); 2219 mem_sql(NULL, NULL, "delete from call_implies;"); 2220 mem_sql(NULL, NULL, "delete from return_implies;"); 2221 } 2222 2223 static void match_end_func_info(struct symbol *sym) 2224 { 2225 if (__path_is_null()) 2226 return; 2227 call_return_state_hooks(NULL); 2228 } 2229 2230 static void match_after_func(struct symbol *sym) 2231 { 2232 if (!__inline_fn) 2233 reset_memdb(sym); 2234 } 2235 2236 static void init_memdb(void) 2237 { 2238 char *err = NULL; 2239 int rc; 2240 const char *schema_files[] = { 2241 "db/db.schema", 2242 "db/caller_info.schema", 2243 "db/common_caller_info.schema", 2244 "db/return_states.schema", 2245 "db/function_type_size.schema", 2246 "db/type_size.schema", 2247 "db/function_type_info.schema", 2248 "db/type_info.schema", 2249 "db/call_implies.schema", 2250 "db/return_implies.schema", 2251 "db/function_ptr.schema", 2252 "db/local_values.schema", 2253 "db/function_type_value.schema", 2254 "db/type_value.schema", 2255 "db/function_type.schema", 2256 "db/data_info.schema", 2257 "db/parameter_name.schema", 2258 "db/constraints.schema", 2259 "db/constraints_required.schema", 2260 "db/fn_ptr_data_link.schema", 2261 "db/fn_data_link.schema", 2262 "db/mtag_about.schema", 2263 "db/mtag_info.schema", 2264 "db/mtag_map.schema", 2265 "db/mtag_data.schema", 2266 "db/mtag_alias.schema", 2267 }; 2268 static char buf[4096]; 2269 int fd; 2270 int ret; 2271 int i; 2272 2273 rc = sqlite3_open(":memory:", &mem_db); 2274 if (rc != SQLITE_OK) { 2275 sm_ierror("starting In-Memory database."); 2276 return; 2277 } 2278 2279 for (i = 0; i < ARRAY_SIZE(schema_files); i++) { 2280 fd = open_schema_file(schema_files[i]); 2281 if (fd < 0) 2282 continue; 2283 ret = read(fd, buf, sizeof(buf)); 2284 if (ret < 0) { 2285 sm_ierror("failed to read: %s", schema_files[i]); 2286 continue; 2287 } 2288 close(fd); 2289 if (ret == sizeof(buf)) { 2290 sm_ierror("Schema file too large: %s (limit %zd bytes)", 2291 schema_files[i], sizeof(buf)); 2292 continue; 2293 } 2294 buf[ret] = '\0'; 2295 rc = sqlite3_exec(mem_db, buf, NULL, NULL, &err); 2296 if (rc != SQLITE_OK) { 2297 sm_ierror("SQL error #2: %s", err); 2298 sm_ierror("%s", buf); 2299 } 2300 } 2301 } 2302 2303 static void init_cachedb(void) 2304 { 2305 char *err = NULL; 2306 int rc; 2307 const char *schema_files[] = { 2308 "db/call_implies.schema", 2309 "db/return_implies.schema", 2310 "db/type_info.schema", 2311 "db/mtag_about.schema", 2312 "db/mtag_data.schema", 2313 "db/mtag_info.schema", 2314 "db/sink_info.schema", 2315 }; 2316 static char buf[4096]; 2317 int fd; 2318 int ret; 2319 int i; 2320 2321 rc = sqlite3_open(":memory:", &cache_db); 2322 if (rc != SQLITE_OK) { 2323 sm_ierror("starting In-Memory database."); 2324 return; 2325 } 2326 2327 for (i = 0; i < ARRAY_SIZE(schema_files); i++) { 2328 fd = open_schema_file(schema_files[i]); 2329 if (fd < 0) 2330 continue; 2331 ret = read(fd, buf, sizeof(buf)); 2332 if (ret < 0) { 2333 sm_ierror("failed to read: %s", schema_files[i]); 2334 continue; 2335 } 2336 close(fd); 2337 if (ret == sizeof(buf)) { 2338 sm_ierror("Schema file too large: %s (limit %zd bytes)", 2339 schema_files[i], sizeof(buf)); 2340 continue; 2341 } 2342 buf[ret] = '\0'; 2343 rc = sqlite3_exec(cache_db, buf, NULL, NULL, &err); 2344 if (rc != SQLITE_OK) { 2345 sm_ierror("SQL error #2: %s", err); 2346 sm_ierror("%s", buf); 2347 } 2348 } 2349 } 2350 2351 static int save_cache_data(void *_table, int argc, char **argv, char **azColName) 2352 { 2353 static char buf[4096]; 2354 char tmp[256]; 2355 char *p = buf; 2356 char *table = _table; 2357 int i; 2358 2359 2360 p += snprintf(p, 4096 - (p - buf), "insert or ignore into %s values (", table); 2361 for (i = 0; i < argc; i++) { 2362 if (i) 2363 p += snprintf(p, 4096 - (p - buf), ", "); 2364 sqlite3_snprintf(sizeof(tmp), tmp, "%q", escape_newlines(argv[i])); 2365 p += snprintf(p, 4096 - (p - buf), "'%s'", tmp); 2366 2367 } 2368 p += snprintf(p, 4096 - (p - buf), ");"); 2369 if (p - buf > 4096) 2370 return 0; 2371 2372 sm_msg("SQL: %s", buf); 2373 return 0; 2374 } 2375 2376 static void dump_cache(struct symbol_list *sym_list) 2377 { 2378 const char *cache_tables[] = { 2379 "type_info", "return_implies", "call_implies", "mtag_data", 2380 "mtag_info", "mtag_about", "sink_info", 2381 }; 2382 char buf[64]; 2383 int i; 2384 2385 if (!option_info) 2386 return; 2387 2388 for (i = 0; i < ARRAY_SIZE(cache_tables); i++) { 2389 snprintf(buf, sizeof(buf), "select * from %s;", cache_tables[i]); 2390 cache_sql(&save_cache_data, (char *)cache_tables[i], buf); 2391 } 2392 } 2393 2394 void open_smatch_db(char *db_file) 2395 { 2396 int rc; 2397 2398 if (option_no_db) 2399 return; 2400 2401 use_states = malloc(num_checks + 1); 2402 memset(use_states, 0xff, num_checks + 1); 2403 2404 init_memdb(); 2405 init_cachedb(); 2406 2407 rc = sqlite3_open_v2(db_file, &smatch_db, SQLITE_OPEN_READONLY, NULL); 2408 if (rc != SQLITE_OK) { 2409 option_no_db = 1; 2410 return; 2411 } 2412 run_sql(NULL, NULL, 2413 "PRAGMA cache_size = %d;", SQLITE_CACHE_PAGES); 2414 return; 2415 } 2416 2417 static void register_common_funcs(void) 2418 { 2419 struct token *token; 2420 char *func; 2421 char filename[256]; 2422 2423 if (option_project == PROJ_NONE) 2424 strcpy(filename, "common_functions"); 2425 else 2426 snprintf(filename, 256, "%s.common_functions", option_project_str); 2427 2428 token = get_tokens_file(filename); 2429 if (!token) 2430 return; 2431 if (token_type(token) != TOKEN_STREAMBEGIN) 2432 return; 2433 token = token->next; 2434 while (token_type(token) != TOKEN_STREAMEND) { 2435 if (token_type(token) != TOKEN_IDENT) 2436 return; 2437 func = alloc_string(show_ident(token->ident)); 2438 add_ptr_list(&common_funcs, func); 2439 token = token->next; 2440 } 2441 clear_token_alloc(); 2442 } 2443 2444 static char *get_next_string(char **str) 2445 { 2446 static char string[256]; 2447 char *start; 2448 char *p = *str; 2449 int len, i, j; 2450 2451 if (*p == '\0') 2452 return NULL; 2453 start = p; 2454 2455 while (*p != '\0' && *p != '\n') { 2456 if (*p == '\\' && *(p + 1) == ' ') { 2457 p += 2; 2458 continue; 2459 } 2460 if (*p == ' ') 2461 break; 2462 p++; 2463 } 2464 2465 len = p - start; 2466 if (len >= sizeof(string)) { 2467 memcpy(string, start, sizeof(string)); 2468 string[sizeof(string) - 1] = '\0'; 2469 sm_ierror("return_fix: '%s' too long", string); 2470 **str = '\0'; 2471 return NULL; 2472 } 2473 memcpy(string, start, len); 2474 string[len] = '\0'; 2475 for (i = 0; i < sizeof(string) - 1; i++) { 2476 if (string[i] == '\\' && string[i + 1] == ' ') { 2477 for (j = i; string[j] != '\0'; j++) 2478 string[j] = string[j + 1]; 2479 } 2480 } 2481 if (*p != '\0') 2482 p++; 2483 *str = p; 2484 return string; 2485 } 2486 2487 static void register_return_replacements(void) 2488 { 2489 char *func, *orig, *new; 2490 char filename[256]; 2491 char buf[4096]; 2492 int fd, ret, i; 2493 char *p; 2494 2495 snprintf(filename, 256, "db/%s.return_fixes", option_project_str); 2496 fd = open_schema_file(filename); 2497 if (fd < 0) 2498 return; 2499 ret = read(fd, buf, sizeof(buf)); 2500 close(fd); 2501 if (ret < 0) 2502 return; 2503 if (ret == sizeof(buf)) { 2504 sm_ierror("file too large: %s (limit %zd bytes)", 2505 filename, sizeof(buf)); 2506 return; 2507 } 2508 buf[ret] = '\0'; 2509 2510 p = buf; 2511 while (*p) { 2512 get_next_string(&p); 2513 replace_count++; 2514 } 2515 if (replace_count == 0 || replace_count % 3 != 0) { 2516 replace_count = 0; 2517 return; 2518 } 2519 replace_table = malloc(replace_count * sizeof(char *)); 2520 2521 p = buf; 2522 i = 0; 2523 while (*p) { 2524 func = alloc_string(get_next_string(&p)); 2525 orig = alloc_string(get_next_string(&p)); 2526 new = alloc_string(get_next_string(&p)); 2527 2528 replace_table[i++] = func; 2529 replace_table[i++] = orig; 2530 replace_table[i++] = new; 2531 } 2532 } 2533 2534 void register_definition_db_callbacks(int id) 2535 { 2536 add_hook(&match_call_info, FUNCTION_CALL_HOOK); 2537 add_hook(&match_call_info_new, FUNCTION_CALL_HOOK); 2538 add_split_return_callback(match_return_info); 2539 add_split_return_callback(print_returned_struct_members); 2540 add_hook(&call_return_state_hooks, RETURN_HOOK); 2541 add_hook(&match_end_func_info, END_FUNC_HOOK); 2542 add_hook(&match_after_func, AFTER_FUNC_HOOK); 2543 2544 add_hook(&match_data_from_db, FUNC_DEF_HOOK); 2545 add_hook(&match_call_implies, FUNC_DEF_HOOK); 2546 add_hook(&match_return_implies, CALL_HOOK_AFTER_INLINE); 2547 2548 register_common_funcs(); 2549 register_return_replacements(); 2550 2551 add_hook(&dump_cache, END_FILE_HOOK); 2552 } 2553 2554 void register_db_call_marker(int id) 2555 { 2556 add_hook(&match_call_marker, FUNCTION_CALL_HOOK); 2557 } 2558 2559 char *return_state_to_var_sym(struct expression *expr, int param, const char *key, struct symbol **sym) 2560 { 2561 struct expression *arg; 2562 char *name = NULL; 2563 char member_name[256]; 2564 2565 *sym = NULL; 2566 2567 if (param == -1) { 2568 const char *star = ""; 2569 2570 if (expr->type != EXPR_ASSIGNMENT) 2571 return NULL; 2572 if (get_type(expr->left) == &int_ctype && strcmp(key, "$") != 0) 2573 return NULL; 2574 name = expr_to_var_sym(expr->left, sym); 2575 if (!name) 2576 return NULL; 2577 if (key[0] == '*') { 2578 star = "*"; 2579 key++; 2580 } 2581 if (strncmp(key, "$", 1) != 0) 2582 return name; 2583 snprintf(member_name, sizeof(member_name), "%s%s%s", star, name, key + 1); 2584 free_string(name); 2585 return alloc_string(member_name); 2586 } 2587 2588 while (expr->type == EXPR_ASSIGNMENT) 2589 expr = strip_expr(expr->right); 2590 if (expr->type != EXPR_CALL) 2591 return NULL; 2592 2593 arg = get_argument_from_call_expr(expr->args, param); 2594 if (!arg) 2595 return NULL; 2596 2597 return get_variable_from_key(arg, key, sym); 2598 } 2599 2600 char *get_variable_from_key(struct expression *arg, const char *key, struct symbol **sym) 2601 { 2602 struct symbol *type; 2603 char buf[256]; 2604 char *tmp; 2605 int star_cnt = 0; 2606 bool add_dot = false; 2607 2608 if (!arg) 2609 return NULL; 2610 2611 arg = strip_expr(arg); 2612 2613 if (strcmp(key, "$") == 0) 2614 return expr_to_var_sym(arg, sym); 2615 2616 if (strcmp(key, "*$") == 0) { 2617 if (arg->type == EXPR_PREOP && arg->op == '&') { 2618 arg = strip_expr(arg->unop); 2619 return expr_to_var_sym(arg, sym); 2620 } else { 2621 tmp = expr_to_var_sym(arg, sym); 2622 if (!tmp) 2623 return NULL; 2624 snprintf(buf, sizeof(buf), "*%s", tmp); 2625 free_string(tmp); 2626 return alloc_string(buf); 2627 } 2628 } 2629 2630 if (strncmp(key, "(*$)", 4) == 0) { 2631 char buf[64]; 2632 2633 if (arg->type == EXPR_PREOP && arg->op == '&') { 2634 arg = strip_expr(arg->unop); 2635 snprintf(buf, sizeof(buf), "$%s", key + 4); 2636 return get_variable_from_key(arg, buf, sym); 2637 } else { 2638 tmp = expr_to_var_sym(arg, sym); 2639 if (!tmp) 2640 return NULL; 2641 snprintf(buf, sizeof(buf), "(*%s)%s", tmp, key + 4); 2642 free_string(tmp); 2643 return alloc_string(buf); 2644 } 2645 } 2646 2647 while (key[0] == '*') { 2648 star_cnt++; 2649 key++; 2650 } 2651 2652 /* 2653 * FIXME: This is a hack. 2654 * We should be able to parse expressions like (*$)->foo and *$->foo. 2655 */ 2656 type = get_type(arg); 2657 if (is_struct_ptr(type)) 2658 add_dot = true; 2659 2660 if (arg->type == EXPR_PREOP && arg->op == '&' && star_cnt && !add_dot) { 2661 arg = strip_expr(arg->unop); 2662 star_cnt--; 2663 } 2664 2665 if (arg->type == EXPR_PREOP && arg->op == '&') { 2666 arg = strip_expr(arg->unop); 2667 tmp = expr_to_var_sym(arg, sym); 2668 if (!tmp) 2669 return NULL; 2670 snprintf(buf, sizeof(buf), "%.*s%s.%s", 2671 star_cnt, "**********", tmp, key + 3); 2672 return alloc_string(buf); 2673 } 2674 2675 tmp = expr_to_var_sym(arg, sym); 2676 if (!tmp) 2677 return NULL; 2678 snprintf(buf, sizeof(buf), "%.*s%s%s", star_cnt, "**********", tmp, key + 1); 2679 free_string(tmp); 2680 return alloc_string(buf); 2681 } 2682 2683 char *get_chunk_from_key(struct expression *arg, char *key, struct symbol **sym, struct var_sym_list **vsl) 2684 { 2685 *vsl = NULL; 2686 2687 if (strcmp("$", key) == 0) 2688 return expr_to_chunk_sym_vsl(arg, sym, vsl); 2689 return get_variable_from_key(arg, key, sym); 2690 } 2691 2692 const char *state_name_to_param_name(const char *state_name, const char *param_name) 2693 { 2694 int star_cnt = 0; 2695 int name_len; 2696 char buf[256]; 2697 2698 name_len = strlen(param_name); 2699 2700 while (state_name[0] == '*') { 2701 star_cnt++; 2702 state_name++; 2703 } 2704 2705 /* ten out of ten stars! */ 2706 if (star_cnt > 10) 2707 return NULL; 2708 2709 if (strncmp(state_name, "(*", 2) == 0 && 2710 strncmp(state_name + 2, param_name, name_len) == 0 && 2711 state_name[name_len + 2] == ')') { 2712 snprintf(buf, sizeof(buf), "%.*s(*$)%s", star_cnt, "**********", 2713 state_name + name_len + 3); 2714 return alloc_sname(buf); 2715 } 2716 2717 if (strcmp(state_name, param_name) == 0) { 2718 snprintf(buf, sizeof(buf), "%.*s$", star_cnt, "**********"); 2719 return alloc_sname(buf); 2720 } 2721 2722 /* check for '-' from "->" */ 2723 if (strncmp(state_name, param_name, name_len) == 0 && 2724 state_name[name_len] == '-') { 2725 snprintf(buf, sizeof(buf), "%.*s$%s", star_cnt, "**********", state_name + name_len); 2726 return alloc_sname(buf); 2727 } 2728 return NULL; 2729 } 2730 2731 const char *get_param_name_var_sym(const char *name, struct symbol *sym) 2732 { 2733 if (!sym || !sym->ident) 2734 return NULL; 2735 2736 return state_name_to_param_name(name, sym->ident->name); 2737 } 2738 2739 const char *get_mtag_name_var_sym(const char *state_name, struct symbol *sym) 2740 { 2741 struct symbol *type; 2742 const char *sym_name; 2743 int name_len; 2744 static char buf[256]; 2745 2746 /* 2747 * mtag_name is different from param_name because mtags can be a struct 2748 * instead of a struct pointer. But we want to treat it like a pointer 2749 * because really an mtag is a pointer. Or in other words, if you pass 2750 * a struct foo then you want to talk about foo.bar but with an mtag 2751 * you want to refer to it as foo->bar. 2752 * 2753 */ 2754 2755 if (!sym || !sym->ident) 2756 return NULL; 2757 2758 type = get_real_base_type(sym); 2759 if (type && type->type == SYM_BASETYPE) 2760 return "*$"; 2761 2762 sym_name = sym->ident->name; 2763 name_len = strlen(sym_name); 2764 2765 if (state_name[name_len] == '.' && /* check for '-' from "->" */ 2766 strncmp(state_name, sym_name, name_len) == 0) { 2767 snprintf(buf, sizeof(buf), "$->%s", state_name + name_len + 1); 2768 return buf; 2769 } 2770 2771 return state_name_to_param_name(state_name, sym_name); 2772 } 2773 2774 const char *get_mtag_name_expr(struct expression *expr) 2775 { 2776 char *name; 2777 struct symbol *sym; 2778 const char *ret = NULL; 2779 2780 name = expr_to_var_sym(expr, &sym); 2781 if (!name || !sym) 2782 goto free; 2783 2784 ret = get_mtag_name_var_sym(name, sym); 2785 free: 2786 free_string(name); 2787 return ret; 2788 } 2789 2790 const char *get_param_name(struct sm_state *sm) 2791 { 2792 return get_param_name_var_sym(sm->name, sm->sym); 2793 } 2794 2795 char *get_data_info_name(struct expression *expr) 2796 { 2797 struct symbol *sym; 2798 char *name; 2799 char buf[256]; 2800 char *ret = NULL; 2801 2802 expr = strip_expr(expr); 2803 name = get_member_name(expr); 2804 if (name) 2805 return name; 2806 name = expr_to_var_sym(expr, &sym); 2807 if (!name || !sym) 2808 goto free; 2809 if (!(sym->ctype.modifiers & MOD_TOPLEVEL)) 2810 goto free; 2811 if (sym->ctype.modifiers & MOD_STATIC) 2812 snprintf(buf, sizeof(buf), "static %s", name); 2813 else 2814 snprintf(buf, sizeof(buf), "global %s", name); 2815 ret = alloc_sname(buf); 2816 free: 2817 free_string(name); 2818 return ret; 2819 } 2820