1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/init/main.c 4 * 5 * Copyright (C) 1991, 1992 Linus Torvalds 6 * 7 * GK 2/5/95 - Changed to support mounting root fs via NFS 8 * Added initrd & change_root: Werner Almesberger & Hans Lermen, Feb '96 9 * Moan early if gcc is old, avoiding bogus kernels - Paul Gortmaker, May '96 10 * Simplified starting of init: Michael A. Griffith <grif@acm.org> 11 */ 12 13 #define DEBUG /* Enable initcall_debug */ 14 15 #include <linux/types.h> 16 #include <linux/extable.h> 17 #include <linux/module.h> 18 #include <linux/proc_fs.h> 19 #include <linux/binfmts.h> 20 #include <linux/kernel.h> 21 #include <linux/syscalls.h> 22 #include <linux/stackprotector.h> 23 #include <linux/string.h> 24 #include <linux/ctype.h> 25 #include <linux/delay.h> 26 #include <linux/ioport.h> 27 #include <linux/init.h> 28 #include <linux/initrd.h> 29 #include <linux/memblock.h> 30 #include <linux/acpi.h> 31 #include <linux/bootconfig.h> 32 #include <linux/console.h> 33 #include <linux/nmi.h> 34 #include <linux/percpu.h> 35 #include <linux/kmod.h> 36 #include <linux/kprobes.h> 37 #include <linux/vmalloc.h> 38 #include <linux/kernel_stat.h> 39 #include <linux/start_kernel.h> 40 #include <linux/security.h> 41 #include <linux/smp.h> 42 #include <linux/profile.h> 43 #include <linux/kfence.h> 44 #include <linux/rcupdate.h> 45 #include <linux/moduleparam.h> 46 #include <linux/kallsyms.h> 47 #include <linux/writeback.h> 48 #include <linux/cpu.h> 49 #include <linux/cpuset.h> 50 #include <linux/cgroup.h> 51 #include <linux/efi.h> 52 #include <linux/tick.h> 53 #include <linux/sched/isolation.h> 54 #include <linux/interrupt.h> 55 #include <linux/taskstats_kern.h> 56 #include <linux/delayacct.h> 57 #include <linux/unistd.h> 58 #include <linux/utsname.h> 59 #include <linux/rmap.h> 60 #include <linux/mempolicy.h> 61 #include <linux/key.h> 62 #include <linux/page_ext.h> 63 #include <linux/debug_locks.h> 64 #include <linux/debugobjects.h> 65 #include <linux/lockdep.h> 66 #include <linux/kmemleak.h> 67 #include <linux/padata.h> 68 #include <linux/pid_namespace.h> 69 #include <linux/device/driver.h> 70 #include <linux/kthread.h> 71 #include <linux/sched.h> 72 #include <linux/sched/init.h> 73 #include <linux/signal.h> 74 #include <linux/idr.h> 75 #include <linux/kgdb.h> 76 #include <linux/ftrace.h> 77 #include <linux/async.h> 78 #include <linux/shmem_fs.h> 79 #include <linux/slab.h> 80 #include <linux/perf_event.h> 81 #include <linux/ptrace.h> 82 #include <linux/pti.h> 83 #include <linux/blkdev.h> 84 #include <linux/elevator.h> 85 #include <linux/sched/clock.h> 86 #include <linux/sched/task.h> 87 #include <linux/sched/task_stack.h> 88 #include <linux/context_tracking.h> 89 #include <linux/random.h> 90 #include <linux/list.h> 91 #include <linux/integrity.h> 92 #include <linux/proc_ns.h> 93 #include <linux/io.h> 94 #include <linux/cache.h> 95 #include <linux/rodata_test.h> 96 #include <linux/jump_label.h> 97 #include <linux/mem_encrypt.h> 98 #include <linux/kcsan.h> 99 #include <linux/init_syscalls.h> 100 #include <linux/stackdepot.h> 101 102 #include <asm/io.h> 103 #include <asm/bugs.h> 104 #include <asm/setup.h> 105 #include <asm/sections.h> 106 #include <asm/cacheflush.h> 107 108 #define CREATE_TRACE_POINTS 109 #include <trace/events/initcall.h> 110 111 #include <kunit/test.h> 112 113 static int kernel_init(void *); 114 115 extern void init_IRQ(void); 116 extern void radix_tree_init(void); 117 118 /* 119 * Debug helper: via this flag we know that we are in 'early bootup code' 120 * where only the boot processor is running with IRQ disabled. This means 121 * two things - IRQ must not be enabled before the flag is cleared and some 122 * operations which are not allowed with IRQ disabled are allowed while the 123 * flag is set. 124 */ 125 bool early_boot_irqs_disabled __read_mostly; 126 127 enum system_states system_state __read_mostly; 128 EXPORT_SYMBOL(system_state); 129 130 /* 131 * Boot command-line arguments 132 */ 133 #define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT 134 #define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT 135 136 extern void time_init(void); 137 /* Default late time init is NULL. archs can override this later. */ 138 void (*__initdata late_time_init)(void); 139 140 /* Untouched command line saved by arch-specific code. */ 141 char __initdata boot_command_line[COMMAND_LINE_SIZE]; 142 /* Untouched saved command line (eg. for /proc) */ 143 char *saved_command_line; 144 /* Command line for parameter parsing */ 145 static char *static_command_line; 146 /* Untouched extra command line */ 147 static char *extra_command_line; 148 /* Extra init arguments */ 149 static char *extra_init_args; 150 151 #ifdef CONFIG_BOOT_CONFIG 152 /* Is bootconfig on command line? */ 153 static bool bootconfig_found; 154 static bool initargs_found; 155 #else 156 # define bootconfig_found false 157 # define initargs_found false 158 #endif 159 160 static char *execute_command; 161 static char *ramdisk_execute_command = "/init"; 162 163 /* 164 * Used to generate warnings if static_key manipulation functions are used 165 * before jump_label_init is called. 166 */ 167 bool static_key_initialized __read_mostly; 168 EXPORT_SYMBOL_GPL(static_key_initialized); 169 170 /* 171 * If set, this is an indication to the drivers that reset the underlying 172 * device before going ahead with the initialization otherwise driver might 173 * rely on the BIOS and skip the reset operation. 174 * 175 * This is useful if kernel is booting in an unreliable environment. 176 * For ex. kdump situation where previous kernel has crashed, BIOS has been 177 * skipped and devices will be in unknown state. 178 */ 179 unsigned int reset_devices; 180 EXPORT_SYMBOL(reset_devices); 181 182 static int __init set_reset_devices(char *str) 183 { 184 reset_devices = 1; 185 return 1; 186 } 187 188 __setup("reset_devices", set_reset_devices); 189 190 static const char *argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; 191 const char *envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; 192 static const char *panic_later, *panic_param; 193 194 extern const struct obs_kernel_param __setup_start[], __setup_end[]; 195 196 static bool __init obsolete_checksetup(char *line) 197 { 198 const struct obs_kernel_param *p; 199 bool had_early_param = false; 200 201 p = __setup_start; 202 do { 203 int n = strlen(p->str); 204 if (parameqn(line, p->str, n)) { 205 if (p->early) { 206 /* Already done in parse_early_param? 207 * (Needs exact match on param part). 208 * Keep iterating, as we can have early 209 * params and __setups of same names 8( */ 210 if (line[n] == '\0' || line[n] == '=') 211 had_early_param = true; 212 } else if (!p->setup_func) { 213 pr_warn("Parameter %s is obsolete, ignored\n", 214 p->str); 215 return true; 216 } else if (p->setup_func(line + n)) 217 return true; 218 } 219 p++; 220 } while (p < __setup_end); 221 222 return had_early_param; 223 } 224 225 /* 226 * This should be approx 2 Bo*oMips to start (note initial shift), and will 227 * still work even if initially too large, it will just take slightly longer 228 */ 229 unsigned long loops_per_jiffy = (1<<12); 230 EXPORT_SYMBOL(loops_per_jiffy); 231 232 static int __init debug_kernel(char *str) 233 { 234 console_loglevel = CONSOLE_LOGLEVEL_DEBUG; 235 return 0; 236 } 237 238 static int __init quiet_kernel(char *str) 239 { 240 console_loglevel = CONSOLE_LOGLEVEL_QUIET; 241 return 0; 242 } 243 244 early_param("debug", debug_kernel); 245 early_param("quiet", quiet_kernel); 246 247 static int __init loglevel(char *str) 248 { 249 int newlevel; 250 251 /* 252 * Only update loglevel value when a correct setting was passed, 253 * to prevent blind crashes (when loglevel being set to 0) that 254 * are quite hard to debug 255 */ 256 if (get_option(&str, &newlevel)) { 257 console_loglevel = newlevel; 258 return 0; 259 } 260 261 return -EINVAL; 262 } 263 264 early_param("loglevel", loglevel); 265 266 #ifdef CONFIG_BLK_DEV_INITRD 267 static void * __init get_boot_config_from_initrd(u32 *_size, u32 *_csum) 268 { 269 u32 size, csum; 270 char *data; 271 u32 *hdr; 272 int i; 273 274 if (!initrd_end) 275 return NULL; 276 277 data = (char *)initrd_end - BOOTCONFIG_MAGIC_LEN; 278 /* 279 * Since Grub may align the size of initrd to 4, we must 280 * check the preceding 3 bytes as well. 281 */ 282 for (i = 0; i < 4; i++) { 283 if (!memcmp(data, BOOTCONFIG_MAGIC, BOOTCONFIG_MAGIC_LEN)) 284 goto found; 285 data--; 286 } 287 return NULL; 288 289 found: 290 hdr = (u32 *)(data - 8); 291 size = le32_to_cpu(hdr[0]); 292 csum = le32_to_cpu(hdr[1]); 293 294 data = ((void *)hdr) - size; 295 if ((unsigned long)data < initrd_start) { 296 pr_err("bootconfig size %d is greater than initrd size %ld\n", 297 size, initrd_end - initrd_start); 298 return NULL; 299 } 300 301 /* Remove bootconfig from initramfs/initrd */ 302 initrd_end = (unsigned long)data; 303 if (_size) 304 *_size = size; 305 if (_csum) 306 *_csum = csum; 307 308 return data; 309 } 310 #else 311 static void * __init get_boot_config_from_initrd(u32 *_size, u32 *_csum) 312 { 313 return NULL; 314 } 315 #endif 316 317 #ifdef CONFIG_BOOT_CONFIG 318 319 static char xbc_namebuf[XBC_KEYLEN_MAX] __initdata; 320 321 #define rest(dst, end) ((end) > (dst) ? (end) - (dst) : 0) 322 323 static int __init xbc_snprint_cmdline(char *buf, size_t size, 324 struct xbc_node *root) 325 { 326 struct xbc_node *knode, *vnode; 327 char *end = buf + size; 328 const char *val; 329 int ret; 330 331 xbc_node_for_each_key_value(root, knode, val) { 332 ret = xbc_node_compose_key_after(root, knode, 333 xbc_namebuf, XBC_KEYLEN_MAX); 334 if (ret < 0) 335 return ret; 336 337 vnode = xbc_node_get_child(knode); 338 if (!vnode) { 339 ret = snprintf(buf, rest(buf, end), "%s ", xbc_namebuf); 340 if (ret < 0) 341 return ret; 342 buf += ret; 343 continue; 344 } 345 xbc_array_for_each_value(vnode, val) { 346 ret = snprintf(buf, rest(buf, end), "%s=\"%s\" ", 347 xbc_namebuf, val); 348 if (ret < 0) 349 return ret; 350 buf += ret; 351 } 352 } 353 354 return buf - (end - size); 355 } 356 #undef rest 357 358 /* Make an extra command line under given key word */ 359 static char * __init xbc_make_cmdline(const char *key) 360 { 361 struct xbc_node *root; 362 char *new_cmdline; 363 int ret, len = 0; 364 365 root = xbc_find_node(key); 366 if (!root) 367 return NULL; 368 369 /* Count required buffer size */ 370 len = xbc_snprint_cmdline(NULL, 0, root); 371 if (len <= 0) 372 return NULL; 373 374 new_cmdline = memblock_alloc(len + 1, SMP_CACHE_BYTES); 375 if (!new_cmdline) { 376 pr_err("Failed to allocate memory for extra kernel cmdline.\n"); 377 return NULL; 378 } 379 380 ret = xbc_snprint_cmdline(new_cmdline, len + 1, root); 381 if (ret < 0 || ret > len) { 382 pr_err("Failed to print extra kernel cmdline.\n"); 383 return NULL; 384 } 385 386 return new_cmdline; 387 } 388 389 static int __init bootconfig_params(char *param, char *val, 390 const char *unused, void *arg) 391 { 392 if (strcmp(param, "bootconfig") == 0) { 393 bootconfig_found = true; 394 } 395 return 0; 396 } 397 398 static void __init setup_boot_config(void) 399 { 400 static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata; 401 const char *msg; 402 int pos; 403 u32 size, csum; 404 char *data, *copy, *err; 405 int ret; 406 407 /* Cut out the bootconfig data even if we have no bootconfig option */ 408 data = get_boot_config_from_initrd(&size, &csum); 409 410 strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); 411 err = parse_args("bootconfig", tmp_cmdline, NULL, 0, 0, 0, NULL, 412 bootconfig_params); 413 414 if (IS_ERR(err) || !bootconfig_found) 415 return; 416 417 /* parse_args() stops at '--' and returns an address */ 418 if (err) 419 initargs_found = true; 420 421 if (!data) { 422 pr_err("'bootconfig' found on command line, but no bootconfig found\n"); 423 return; 424 } 425 426 if (size >= XBC_DATA_MAX) { 427 pr_err("bootconfig size %d greater than max size %d\n", 428 size, XBC_DATA_MAX); 429 return; 430 } 431 432 if (xbc_calc_checksum(data, size) != csum) { 433 pr_err("bootconfig checksum failed\n"); 434 return; 435 } 436 437 copy = memblock_alloc(size + 1, SMP_CACHE_BYTES); 438 if (!copy) { 439 pr_err("Failed to allocate memory for bootconfig\n"); 440 return; 441 } 442 443 memcpy(copy, data, size); 444 copy[size] = '\0'; 445 446 ret = xbc_init(copy, &msg, &pos); 447 if (ret < 0) { 448 if (pos < 0) 449 pr_err("Failed to init bootconfig: %s.\n", msg); 450 else 451 pr_err("Failed to parse bootconfig: %s at %d.\n", 452 msg, pos); 453 } else { 454 pr_info("Load bootconfig: %d bytes %d nodes\n", size, ret); 455 /* keys starting with "kernel." are passed via cmdline */ 456 extra_command_line = xbc_make_cmdline("kernel"); 457 /* Also, "init." keys are init arguments */ 458 extra_init_args = xbc_make_cmdline("init"); 459 } 460 return; 461 } 462 463 #else 464 465 static void __init setup_boot_config(void) 466 { 467 /* Remove bootconfig data from initrd */ 468 get_boot_config_from_initrd(NULL, NULL); 469 } 470 471 static int __init warn_bootconfig(char *str) 472 { 473 pr_warn("WARNING: 'bootconfig' found on the kernel command line but CONFIG_BOOT_CONFIG is not set.\n"); 474 return 0; 475 } 476 early_param("bootconfig", warn_bootconfig); 477 478 #endif 479 480 /* Change NUL term back to "=", to make "param" the whole string. */ 481 static void __init repair_env_string(char *param, char *val) 482 { 483 if (val) { 484 /* param=val or param="val"? */ 485 if (val == param+strlen(param)+1) 486 val[-1] = '='; 487 else if (val == param+strlen(param)+2) { 488 val[-2] = '='; 489 memmove(val-1, val, strlen(val)+1); 490 } else 491 BUG(); 492 } 493 } 494 495 /* Anything after -- gets handed straight to init. */ 496 static int __init set_init_arg(char *param, char *val, 497 const char *unused, void *arg) 498 { 499 unsigned int i; 500 501 if (panic_later) 502 return 0; 503 504 repair_env_string(param, val); 505 506 for (i = 0; argv_init[i]; i++) { 507 if (i == MAX_INIT_ARGS) { 508 panic_later = "init"; 509 panic_param = param; 510 return 0; 511 } 512 } 513 argv_init[i] = param; 514 return 0; 515 } 516 517 /* 518 * Unknown boot options get handed to init, unless they look like 519 * unused parameters (modprobe will find them in /proc/cmdline). 520 */ 521 static int __init unknown_bootoption(char *param, char *val, 522 const char *unused, void *arg) 523 { 524 size_t len = strlen(param); 525 526 repair_env_string(param, val); 527 528 /* Handle obsolete-style parameters */ 529 if (obsolete_checksetup(param)) 530 return 0; 531 532 /* Unused module parameter. */ 533 if (strnchr(param, len, '.')) 534 return 0; 535 536 if (panic_later) 537 return 0; 538 539 if (val) { 540 /* Environment option */ 541 unsigned int i; 542 for (i = 0; envp_init[i]; i++) { 543 if (i == MAX_INIT_ENVS) { 544 panic_later = "env"; 545 panic_param = param; 546 } 547 if (!strncmp(param, envp_init[i], len+1)) 548 break; 549 } 550 envp_init[i] = param; 551 } else { 552 /* Command line option */ 553 unsigned int i; 554 for (i = 0; argv_init[i]; i++) { 555 if (i == MAX_INIT_ARGS) { 556 panic_later = "init"; 557 panic_param = param; 558 } 559 } 560 argv_init[i] = param; 561 } 562 return 0; 563 } 564 565 static int __init init_setup(char *str) 566 { 567 unsigned int i; 568 569 execute_command = str; 570 /* 571 * In case LILO is going to boot us with default command line, 572 * it prepends "auto" before the whole cmdline which makes 573 * the shell think it should execute a script with such name. 574 * So we ignore all arguments entered _before_ init=... [MJ] 575 */ 576 for (i = 1; i < MAX_INIT_ARGS; i++) 577 argv_init[i] = NULL; 578 return 1; 579 } 580 __setup("init=", init_setup); 581 582 static int __init rdinit_setup(char *str) 583 { 584 unsigned int i; 585 586 ramdisk_execute_command = str; 587 /* See "auto" comment in init_setup */ 588 for (i = 1; i < MAX_INIT_ARGS; i++) 589 argv_init[i] = NULL; 590 return 1; 591 } 592 __setup("rdinit=", rdinit_setup); 593 594 #ifndef CONFIG_SMP 595 static const unsigned int setup_max_cpus = NR_CPUS; 596 static inline void setup_nr_cpu_ids(void) { } 597 static inline void smp_prepare_cpus(unsigned int maxcpus) { } 598 #endif 599 600 /* 601 * We need to store the untouched command line for future reference. 602 * We also need to store the touched command line since the parameter 603 * parsing is performed in place, and we should allow a component to 604 * store reference of name/value for future reference. 605 */ 606 static void __init setup_command_line(char *command_line) 607 { 608 size_t len, xlen = 0, ilen = 0; 609 610 if (extra_command_line) 611 xlen = strlen(extra_command_line); 612 if (extra_init_args) 613 ilen = strlen(extra_init_args) + 4; /* for " -- " */ 614 615 len = xlen + strlen(boot_command_line) + 1; 616 617 saved_command_line = memblock_alloc(len + ilen, SMP_CACHE_BYTES); 618 if (!saved_command_line) 619 panic("%s: Failed to allocate %zu bytes\n", __func__, len + ilen); 620 621 static_command_line = memblock_alloc(len, SMP_CACHE_BYTES); 622 if (!static_command_line) 623 panic("%s: Failed to allocate %zu bytes\n", __func__, len); 624 625 if (xlen) { 626 /* 627 * We have to put extra_command_line before boot command 628 * lines because there could be dashes (separator of init 629 * command line) in the command lines. 630 */ 631 strcpy(saved_command_line, extra_command_line); 632 strcpy(static_command_line, extra_command_line); 633 } 634 strcpy(saved_command_line + xlen, boot_command_line); 635 strcpy(static_command_line + xlen, command_line); 636 637 if (ilen) { 638 /* 639 * Append supplemental init boot args to saved_command_line 640 * so that user can check what command line options passed 641 * to init. 642 */ 643 len = strlen(saved_command_line); 644 if (initargs_found) { 645 saved_command_line[len++] = ' '; 646 } else { 647 strcpy(saved_command_line + len, " -- "); 648 len += 4; 649 } 650 651 strcpy(saved_command_line + len, extra_init_args); 652 } 653 } 654 655 /* 656 * We need to finalize in a non-__init function or else race conditions 657 * between the root thread and the init thread may cause start_kernel to 658 * be reaped by free_initmem before the root thread has proceeded to 659 * cpu_idle. 660 * 661 * gcc-3.4 accidentally inlines this function, so use noinline. 662 */ 663 664 static __initdata DECLARE_COMPLETION(kthreadd_done); 665 666 noinline void __ref rest_init(void) 667 { 668 struct task_struct *tsk; 669 int pid; 670 671 rcu_scheduler_starting(); 672 /* 673 * We need to spawn init first so that it obtains pid 1, however 674 * the init task will end up wanting to create kthreads, which, if 675 * we schedule it before we create kthreadd, will OOPS. 676 */ 677 pid = kernel_thread(kernel_init, NULL, CLONE_FS); 678 /* 679 * Pin init on the boot CPU. Task migration is not properly working 680 * until sched_init_smp() has been run. It will set the allowed 681 * CPUs for init to the non isolated CPUs. 682 */ 683 rcu_read_lock(); 684 tsk = find_task_by_pid_ns(pid, &init_pid_ns); 685 set_cpus_allowed_ptr(tsk, cpumask_of(smp_processor_id())); 686 rcu_read_unlock(); 687 688 numa_default_policy(); 689 pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES); 690 rcu_read_lock(); 691 kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns); 692 rcu_read_unlock(); 693 694 /* 695 * Enable might_sleep() and smp_processor_id() checks. 696 * They cannot be enabled earlier because with CONFIG_PREEMPTION=y 697 * kernel_thread() would trigger might_sleep() splats. With 698 * CONFIG_PREEMPT_VOLUNTARY=y the init task might have scheduled 699 * already, but it's stuck on the kthreadd_done completion. 700 */ 701 system_state = SYSTEM_SCHEDULING; 702 703 complete(&kthreadd_done); 704 705 /* 706 * The boot idle thread must execute schedule() 707 * at least once to get things moving: 708 */ 709 schedule_preempt_disabled(); 710 /* Call into cpu_idle with preempt disabled */ 711 cpu_startup_entry(CPUHP_ONLINE); 712 } 713 714 /* Check for early params. */ 715 static int __init do_early_param(char *param, char *val, 716 const char *unused, void *arg) 717 { 718 const struct obs_kernel_param *p; 719 720 for (p = __setup_start; p < __setup_end; p++) { 721 if ((p->early && parameq(param, p->str)) || 722 (strcmp(param, "console") == 0 && 723 strcmp(p->str, "earlycon") == 0) 724 ) { 725 if (p->setup_func(val) != 0) 726 pr_warn("Malformed early option '%s'\n", param); 727 } 728 } 729 /* We accept everything at this stage. */ 730 return 0; 731 } 732 733 void __init parse_early_options(char *cmdline) 734 { 735 parse_args("early options", cmdline, NULL, 0, 0, 0, NULL, 736 do_early_param); 737 } 738 739 /* Arch code calls this early on, or if not, just before other parsing. */ 740 void __init parse_early_param(void) 741 { 742 static int done __initdata; 743 static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata; 744 745 if (done) 746 return; 747 748 /* All fall through to do_early_param. */ 749 strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); 750 parse_early_options(tmp_cmdline); 751 done = 1; 752 } 753 754 void __init __weak arch_post_acpi_subsys_init(void) { } 755 756 void __init __weak smp_setup_processor_id(void) 757 { 758 } 759 760 # if THREAD_SIZE >= PAGE_SIZE 761 void __init __weak thread_stack_cache_init(void) 762 { 763 } 764 #endif 765 766 void __init __weak mem_encrypt_init(void) { } 767 768 void __init __weak poking_init(void) { } 769 770 void __init __weak pgtable_cache_init(void) { } 771 772 bool initcall_debug; 773 core_param(initcall_debug, initcall_debug, bool, 0644); 774 775 #ifdef TRACEPOINTS_ENABLED 776 static void __init initcall_debug_enable(void); 777 #else 778 static inline void initcall_debug_enable(void) 779 { 780 } 781 #endif 782 783 /* Report memory auto-initialization states for this boot. */ 784 static void __init report_meminit(void) 785 { 786 const char *stack; 787 788 if (IS_ENABLED(CONFIG_INIT_STACK_ALL_PATTERN)) 789 stack = "all(pattern)"; 790 else if (IS_ENABLED(CONFIG_INIT_STACK_ALL_ZERO)) 791 stack = "all(zero)"; 792 else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL)) 793 stack = "byref_all(zero)"; 794 else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF)) 795 stack = "byref(zero)"; 796 else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_USER)) 797 stack = "__user(zero)"; 798 else 799 stack = "off"; 800 801 pr_info("mem auto-init: stack:%s, heap alloc:%s, heap free:%s\n", 802 stack, want_init_on_alloc(GFP_KERNEL) ? "on" : "off", 803 want_init_on_free() ? "on" : "off"); 804 if (want_init_on_free()) 805 pr_info("mem auto-init: clearing system memory may take some time...\n"); 806 } 807 808 /* 809 * Set up kernel memory allocators 810 */ 811 static void __init mm_init(void) 812 { 813 /* 814 * page_ext requires contiguous pages, 815 * bigger than MAX_ORDER unless SPARSEMEM. 816 */ 817 page_ext_init_flatmem(); 818 init_mem_debugging_and_hardening(); 819 kfence_alloc_pool(); 820 report_meminit(); 821 stack_depot_init(); 822 mem_init(); 823 mem_init_print_info(); 824 /* page_owner must be initialized after buddy is ready */ 825 page_ext_init_flatmem_late(); 826 kmem_cache_init(); 827 kmemleak_init(); 828 pgtable_init(); 829 debug_objects_mem_init(); 830 vmalloc_init(); 831 /* Should be run before the first non-init thread is created */ 832 init_espfix_bsp(); 833 /* Should be run after espfix64 is set up. */ 834 pti_init(); 835 } 836 837 #ifdef CONFIG_HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET 838 DEFINE_STATIC_KEY_MAYBE_RO(CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT, 839 randomize_kstack_offset); 840 DEFINE_PER_CPU(u32, kstack_offset); 841 842 static int __init early_randomize_kstack_offset(char *buf) 843 { 844 int ret; 845 bool bool_result; 846 847 ret = kstrtobool(buf, &bool_result); 848 if (ret) 849 return ret; 850 851 if (bool_result) 852 static_branch_enable(&randomize_kstack_offset); 853 else 854 static_branch_disable(&randomize_kstack_offset); 855 return 0; 856 } 857 early_param("randomize_kstack_offset", early_randomize_kstack_offset); 858 #endif 859 860 void __init __weak arch_call_rest_init(void) 861 { 862 rest_init(); 863 } 864 865 asmlinkage __visible void __init __no_sanitize_address start_kernel(void) 866 { 867 char *command_line; 868 char *after_dashes; 869 870 set_task_stack_end_magic(&init_task); 871 smp_setup_processor_id(); 872 debug_objects_early_init(); 873 874 cgroup_init_early(); 875 876 local_irq_disable(); 877 early_boot_irqs_disabled = true; 878 879 /* 880 * Interrupts are still disabled. Do necessary setups, then 881 * enable them. 882 */ 883 boot_cpu_init(); 884 page_address_init(); 885 pr_notice("%s", linux_banner); 886 early_security_init(); 887 setup_arch(&command_line); 888 setup_boot_config(); 889 setup_command_line(command_line); 890 setup_nr_cpu_ids(); 891 setup_per_cpu_areas(); 892 smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ 893 boot_cpu_hotplug_init(); 894 895 build_all_zonelists(NULL); 896 page_alloc_init(); 897 898 pr_notice("Kernel command line: %s\n", saved_command_line); 899 /* parameters may set static keys */ 900 jump_label_init(); 901 parse_early_param(); 902 after_dashes = parse_args("Booting kernel", 903 static_command_line, __start___param, 904 __stop___param - __start___param, 905 -1, -1, NULL, &unknown_bootoption); 906 if (!IS_ERR_OR_NULL(after_dashes)) 907 parse_args("Setting init args", after_dashes, NULL, 0, -1, -1, 908 NULL, set_init_arg); 909 if (extra_init_args) 910 parse_args("Setting extra init args", extra_init_args, 911 NULL, 0, -1, -1, NULL, set_init_arg); 912 913 /* 914 * These use large bootmem allocations and must precede 915 * kmem_cache_init() 916 */ 917 setup_log_buf(0); 918 vfs_caches_init_early(); 919 sort_main_extable(); 920 trap_init(); 921 mm_init(); 922 923 ftrace_init(); 924 925 /* trace_printk can be enabled here */ 926 early_trace_init(); 927 928 /* 929 * Set up the scheduler prior starting any interrupts (such as the 930 * timer interrupt). Full topology setup happens at smp_init() 931 * time - but meanwhile we still have a functioning scheduler. 932 */ 933 sched_init(); 934 /* 935 * Disable preemption - early bootup scheduling is extremely 936 * fragile until we cpu_idle() for the first time. 937 */ 938 preempt_disable(); 939 if (WARN(!irqs_disabled(), 940 "Interrupts were enabled *very* early, fixing it\n")) 941 local_irq_disable(); 942 radix_tree_init(); 943 944 /* 945 * Set up housekeeping before setting up workqueues to allow the unbound 946 * workqueue to take non-housekeeping into account. 947 */ 948 housekeeping_init(); 949 950 /* 951 * Allow workqueue creation and work item queueing/cancelling 952 * early. Work item execution depends on kthreads and starts after 953 * workqueue_init(). 954 */ 955 workqueue_init_early(); 956 957 rcu_init(); 958 959 /* Trace events are available after this */ 960 trace_init(); 961 962 if (initcall_debug) 963 initcall_debug_enable(); 964 965 context_tracking_init(); 966 /* init some links before init_ISA_irqs() */ 967 early_irq_init(); 968 init_IRQ(); 969 tick_init(); 970 rcu_init_nohz(); 971 init_timers(); 972 hrtimers_init(); 973 softirq_init(); 974 timekeeping_init(); 975 kfence_init(); 976 977 /* 978 * For best initial stack canary entropy, prepare it after: 979 * - setup_arch() for any UEFI RNG entropy and boot cmdline access 980 * - timekeeping_init() for ktime entropy used in rand_initialize() 981 * - rand_initialize() to get any arch-specific entropy like RDRAND 982 * - add_latent_entropy() to get any latent entropy 983 * - adding command line entropy 984 */ 985 rand_initialize(); 986 add_latent_entropy(); 987 add_device_randomness(command_line, strlen(command_line)); 988 boot_init_stack_canary(); 989 990 time_init(); 991 perf_event_init(); 992 profile_init(); 993 call_function_init(); 994 WARN(!irqs_disabled(), "Interrupts were enabled early\n"); 995 996 early_boot_irqs_disabled = false; 997 local_irq_enable(); 998 999 kmem_cache_init_late(); 1000 1001 /* 1002 * HACK ALERT! This is early. We're enabling the console before 1003 * we've done PCI setups etc, and console_init() must be aware of 1004 * this. But we do want output early, in case something goes wrong. 1005 */ 1006 console_init(); 1007 if (panic_later) 1008 panic("Too many boot %s vars at `%s'", panic_later, 1009 panic_param); 1010 1011 lockdep_init(); 1012 1013 /* 1014 * Need to run this when irqs are enabled, because it wants 1015 * to self-test [hard/soft]-irqs on/off lock inversion bugs 1016 * too: 1017 */ 1018 locking_selftest(); 1019 1020 /* 1021 * This needs to be called before any devices perform DMA 1022 * operations that might use the SWIOTLB bounce buffers. It will 1023 * mark the bounce buffers as decrypted so that their usage will 1024 * not cause "plain-text" data to be decrypted when accessed. 1025 */ 1026 mem_encrypt_init(); 1027 1028 #ifdef CONFIG_BLK_DEV_INITRD 1029 if (initrd_start && !initrd_below_start_ok && 1030 page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) { 1031 pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n", 1032 page_to_pfn(virt_to_page((void *)initrd_start)), 1033 min_low_pfn); 1034 initrd_start = 0; 1035 } 1036 #endif 1037 setup_per_cpu_pageset(); 1038 numa_policy_init(); 1039 acpi_early_init(); 1040 if (late_time_init) 1041 late_time_init(); 1042 sched_clock_init(); 1043 calibrate_delay(); 1044 pid_idr_init(); 1045 anon_vma_init(); 1046 #ifdef CONFIG_X86 1047 if (efi_enabled(EFI_RUNTIME_SERVICES)) 1048 efi_enter_virtual_mode(); 1049 #endif 1050 thread_stack_cache_init(); 1051 cred_init(); 1052 fork_init(); 1053 proc_caches_init(); 1054 uts_ns_init(); 1055 key_init(); 1056 security_init(); 1057 dbg_late_init(); 1058 vfs_caches_init(); 1059 pagecache_init(); 1060 signals_init(); 1061 seq_file_init(); 1062 proc_root_init(); 1063 nsfs_init(); 1064 cpuset_init(); 1065 cgroup_init(); 1066 taskstats_init_early(); 1067 delayacct_init(); 1068 1069 poking_init(); 1070 check_bugs(); 1071 1072 acpi_subsystem_init(); 1073 arch_post_acpi_subsys_init(); 1074 kcsan_init(); 1075 1076 /* Do the rest non-__init'ed, we're now alive */ 1077 arch_call_rest_init(); 1078 1079 prevent_tail_call_optimization(); 1080 } 1081 1082 /* Call all constructor functions linked into the kernel. */ 1083 static void __init do_ctors(void) 1084 { 1085 /* 1086 * For UML, the constructors have already been called by the 1087 * normal setup code as it's just a normal ELF binary, so we 1088 * cannot do it again - but we do need CONFIG_CONSTRUCTORS 1089 * even on UML for modules. 1090 */ 1091 #if defined(CONFIG_CONSTRUCTORS) && !defined(CONFIG_UML) 1092 ctor_fn_t *fn = (ctor_fn_t *) __ctors_start; 1093 1094 for (; fn < (ctor_fn_t *) __ctors_end; fn++) 1095 (*fn)(); 1096 #endif 1097 } 1098 1099 #ifdef CONFIG_KALLSYMS 1100 struct blacklist_entry { 1101 struct list_head next; 1102 char *buf; 1103 }; 1104 1105 static __initdata_or_module LIST_HEAD(blacklisted_initcalls); 1106 1107 static int __init initcall_blacklist(char *str) 1108 { 1109 char *str_entry; 1110 struct blacklist_entry *entry; 1111 1112 /* str argument is a comma-separated list of functions */ 1113 do { 1114 str_entry = strsep(&str, ","); 1115 if (str_entry) { 1116 pr_debug("blacklisting initcall %s\n", str_entry); 1117 entry = memblock_alloc(sizeof(*entry), 1118 SMP_CACHE_BYTES); 1119 if (!entry) 1120 panic("%s: Failed to allocate %zu bytes\n", 1121 __func__, sizeof(*entry)); 1122 entry->buf = memblock_alloc(strlen(str_entry) + 1, 1123 SMP_CACHE_BYTES); 1124 if (!entry->buf) 1125 panic("%s: Failed to allocate %zu bytes\n", 1126 __func__, strlen(str_entry) + 1); 1127 strcpy(entry->buf, str_entry); 1128 list_add(&entry->next, &blacklisted_initcalls); 1129 } 1130 } while (str_entry); 1131 1132 return 0; 1133 } 1134 1135 static bool __init_or_module initcall_blacklisted(initcall_t fn) 1136 { 1137 struct blacklist_entry *entry; 1138 char fn_name[KSYM_SYMBOL_LEN]; 1139 unsigned long addr; 1140 1141 if (list_empty(&blacklisted_initcalls)) 1142 return false; 1143 1144 addr = (unsigned long) dereference_function_descriptor(fn); 1145 sprint_symbol_no_offset(fn_name, addr); 1146 1147 /* 1148 * fn will be "function_name [module_name]" where [module_name] is not 1149 * displayed for built-in init functions. Strip off the [module_name]. 1150 */ 1151 strreplace(fn_name, ' ', '\0'); 1152 1153 list_for_each_entry(entry, &blacklisted_initcalls, next) { 1154 if (!strcmp(fn_name, entry->buf)) { 1155 pr_debug("initcall %s blacklisted\n", fn_name); 1156 return true; 1157 } 1158 } 1159 1160 return false; 1161 } 1162 #else 1163 static int __init initcall_blacklist(char *str) 1164 { 1165 pr_warn("initcall_blacklist requires CONFIG_KALLSYMS\n"); 1166 return 0; 1167 } 1168 1169 static bool __init_or_module initcall_blacklisted(initcall_t fn) 1170 { 1171 return false; 1172 } 1173 #endif 1174 __setup("initcall_blacklist=", initcall_blacklist); 1175 1176 static __init_or_module void 1177 trace_initcall_start_cb(void *data, initcall_t fn) 1178 { 1179 ktime_t *calltime = (ktime_t *)data; 1180 1181 printk(KERN_DEBUG "calling %pS @ %i\n", fn, task_pid_nr(current)); 1182 *calltime = ktime_get(); 1183 } 1184 1185 static __init_or_module void 1186 trace_initcall_finish_cb(void *data, initcall_t fn, int ret) 1187 { 1188 ktime_t *calltime = (ktime_t *)data; 1189 ktime_t delta, rettime; 1190 unsigned long long duration; 1191 1192 rettime = ktime_get(); 1193 delta = ktime_sub(rettime, *calltime); 1194 duration = (unsigned long long) ktime_to_ns(delta) >> 10; 1195 printk(KERN_DEBUG "initcall %pS returned %d after %lld usecs\n", 1196 fn, ret, duration); 1197 } 1198 1199 static ktime_t initcall_calltime; 1200 1201 #ifdef TRACEPOINTS_ENABLED 1202 static void __init initcall_debug_enable(void) 1203 { 1204 int ret; 1205 1206 ret = register_trace_initcall_start(trace_initcall_start_cb, 1207 &initcall_calltime); 1208 ret |= register_trace_initcall_finish(trace_initcall_finish_cb, 1209 &initcall_calltime); 1210 WARN(ret, "Failed to register initcall tracepoints\n"); 1211 } 1212 # define do_trace_initcall_start trace_initcall_start 1213 # define do_trace_initcall_finish trace_initcall_finish 1214 #else 1215 static inline void do_trace_initcall_start(initcall_t fn) 1216 { 1217 if (!initcall_debug) 1218 return; 1219 trace_initcall_start_cb(&initcall_calltime, fn); 1220 } 1221 static inline void do_trace_initcall_finish(initcall_t fn, int ret) 1222 { 1223 if (!initcall_debug) 1224 return; 1225 trace_initcall_finish_cb(&initcall_calltime, fn, ret); 1226 } 1227 #endif /* !TRACEPOINTS_ENABLED */ 1228 1229 int __init_or_module do_one_initcall(initcall_t fn) 1230 { 1231 int count = preempt_count(); 1232 char msgbuf[64]; 1233 int ret; 1234 1235 if (initcall_blacklisted(fn)) 1236 return -EPERM; 1237 1238 do_trace_initcall_start(fn); 1239 ret = fn(); 1240 do_trace_initcall_finish(fn, ret); 1241 1242 msgbuf[0] = 0; 1243 1244 if (preempt_count() != count) { 1245 sprintf(msgbuf, "preemption imbalance "); 1246 preempt_count_set(count); 1247 } 1248 if (irqs_disabled()) { 1249 strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf)); 1250 local_irq_enable(); 1251 } 1252 WARN(msgbuf[0], "initcall %pS returned with %s\n", fn, msgbuf); 1253 1254 add_latent_entropy(); 1255 return ret; 1256 } 1257 1258 1259 extern initcall_entry_t __initcall_start[]; 1260 extern initcall_entry_t __initcall0_start[]; 1261 extern initcall_entry_t __initcall1_start[]; 1262 extern initcall_entry_t __initcall2_start[]; 1263 extern initcall_entry_t __initcall3_start[]; 1264 extern initcall_entry_t __initcall4_start[]; 1265 extern initcall_entry_t __initcall5_start[]; 1266 extern initcall_entry_t __initcall6_start[]; 1267 extern initcall_entry_t __initcall7_start[]; 1268 extern initcall_entry_t __initcall_end[]; 1269 1270 static initcall_entry_t *initcall_levels[] __initdata = { 1271 __initcall0_start, 1272 __initcall1_start, 1273 __initcall2_start, 1274 __initcall3_start, 1275 __initcall4_start, 1276 __initcall5_start, 1277 __initcall6_start, 1278 __initcall7_start, 1279 __initcall_end, 1280 }; 1281 1282 /* Keep these in sync with initcalls in include/linux/init.h */ 1283 static const char *initcall_level_names[] __initdata = { 1284 "pure", 1285 "core", 1286 "postcore", 1287 "arch", 1288 "subsys", 1289 "fs", 1290 "device", 1291 "late", 1292 }; 1293 1294 static int __init ignore_unknown_bootoption(char *param, char *val, 1295 const char *unused, void *arg) 1296 { 1297 return 0; 1298 } 1299 1300 static void __init do_initcall_level(int level, char *command_line) 1301 { 1302 initcall_entry_t *fn; 1303 1304 parse_args(initcall_level_names[level], 1305 command_line, __start___param, 1306 __stop___param - __start___param, 1307 level, level, 1308 NULL, ignore_unknown_bootoption); 1309 1310 trace_initcall_level(initcall_level_names[level]); 1311 for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++) 1312 do_one_initcall(initcall_from_entry(fn)); 1313 } 1314 1315 static void __init do_initcalls(void) 1316 { 1317 int level; 1318 size_t len = strlen(saved_command_line) + 1; 1319 char *command_line; 1320 1321 command_line = kzalloc(len, GFP_KERNEL); 1322 if (!command_line) 1323 panic("%s: Failed to allocate %zu bytes\n", __func__, len); 1324 1325 for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) { 1326 /* Parser modifies command_line, restore it each time */ 1327 strcpy(command_line, saved_command_line); 1328 do_initcall_level(level, command_line); 1329 } 1330 1331 kfree(command_line); 1332 } 1333 1334 /* 1335 * Ok, the machine is now initialized. None of the devices 1336 * have been touched yet, but the CPU subsystem is up and 1337 * running, and memory and process management works. 1338 * 1339 * Now we can finally start doing some real work.. 1340 */ 1341 static void __init do_basic_setup(void) 1342 { 1343 cpuset_init_smp(); 1344 driver_init(); 1345 init_irq_proc(); 1346 do_ctors(); 1347 usermodehelper_enable(); 1348 do_initcalls(); 1349 } 1350 1351 static void __init do_pre_smp_initcalls(void) 1352 { 1353 initcall_entry_t *fn; 1354 1355 trace_initcall_level("early"); 1356 for (fn = __initcall_start; fn < __initcall0_start; fn++) 1357 do_one_initcall(initcall_from_entry(fn)); 1358 } 1359 1360 static int run_init_process(const char *init_filename) 1361 { 1362 const char *const *p; 1363 1364 argv_init[0] = init_filename; 1365 pr_info("Run %s as init process\n", init_filename); 1366 pr_debug(" with arguments:\n"); 1367 for (p = argv_init; *p; p++) 1368 pr_debug(" %s\n", *p); 1369 pr_debug(" with environment:\n"); 1370 for (p = envp_init; *p; p++) 1371 pr_debug(" %s\n", *p); 1372 return kernel_execve(init_filename, argv_init, envp_init); 1373 } 1374 1375 static int try_to_run_init_process(const char *init_filename) 1376 { 1377 int ret; 1378 1379 ret = run_init_process(init_filename); 1380 1381 if (ret && ret != -ENOENT) { 1382 pr_err("Starting init: %s exists but couldn't execute it (error %d)\n", 1383 init_filename, ret); 1384 } 1385 1386 return ret; 1387 } 1388 1389 static noinline void __init kernel_init_freeable(void); 1390 1391 #if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX) 1392 bool rodata_enabled __ro_after_init = true; 1393 static int __init set_debug_rodata(char *str) 1394 { 1395 return strtobool(str, &rodata_enabled); 1396 } 1397 __setup("rodata=", set_debug_rodata); 1398 #endif 1399 1400 #ifdef CONFIG_STRICT_KERNEL_RWX 1401 static void mark_readonly(void) 1402 { 1403 if (rodata_enabled) { 1404 /* 1405 * load_module() results in W+X mappings, which are cleaned 1406 * up with call_rcu(). Let's make sure that queued work is 1407 * flushed so that we don't hit false positives looking for 1408 * insecure pages which are W+X. 1409 */ 1410 rcu_barrier(); 1411 mark_rodata_ro(); 1412 rodata_test(); 1413 } else 1414 pr_info("Kernel memory protection disabled.\n"); 1415 } 1416 #elif defined(CONFIG_ARCH_HAS_STRICT_KERNEL_RWX) 1417 static inline void mark_readonly(void) 1418 { 1419 pr_warn("Kernel memory protection not selected by kernel config.\n"); 1420 } 1421 #else 1422 static inline void mark_readonly(void) 1423 { 1424 pr_warn("This architecture does not have kernel memory protection.\n"); 1425 } 1426 #endif 1427 1428 void __weak free_initmem(void) 1429 { 1430 free_initmem_default(POISON_FREE_INITMEM); 1431 } 1432 1433 static int __ref kernel_init(void *unused) 1434 { 1435 int ret; 1436 1437 kernel_init_freeable(); 1438 /* need to finish all async __init code before freeing the memory */ 1439 async_synchronize_full(); 1440 kprobe_free_init_mem(); 1441 ftrace_free_init_mem(); 1442 kgdb_free_init_mem(); 1443 free_initmem(); 1444 mark_readonly(); 1445 1446 /* 1447 * Kernel mappings are now finalized - update the userspace page-table 1448 * to finalize PTI. 1449 */ 1450 pti_finalize(); 1451 1452 system_state = SYSTEM_RUNNING; 1453 numa_default_policy(); 1454 1455 rcu_end_inkernel_boot(); 1456 1457 do_sysctl_args(); 1458 1459 if (ramdisk_execute_command) { 1460 ret = run_init_process(ramdisk_execute_command); 1461 if (!ret) 1462 return 0; 1463 pr_err("Failed to execute %s (error %d)\n", 1464 ramdisk_execute_command, ret); 1465 } 1466 1467 /* 1468 * We try each of these until one succeeds. 1469 * 1470 * The Bourne shell can be used instead of init if we are 1471 * trying to recover a really broken machine. 1472 */ 1473 if (execute_command) { 1474 ret = run_init_process(execute_command); 1475 if (!ret) 1476 return 0; 1477 panic("Requested init %s failed (error %d).", 1478 execute_command, ret); 1479 } 1480 1481 if (CONFIG_DEFAULT_INIT[0] != '\0') { 1482 ret = run_init_process(CONFIG_DEFAULT_INIT); 1483 if (ret) 1484 pr_err("Default init %s failed (error %d)\n", 1485 CONFIG_DEFAULT_INIT, ret); 1486 else 1487 return 0; 1488 } 1489 1490 if (!try_to_run_init_process("/sbin/init") || 1491 !try_to_run_init_process("/etc/init") || 1492 !try_to_run_init_process("/bin/init") || 1493 !try_to_run_init_process("/bin/sh")) 1494 return 0; 1495 1496 panic("No working init found. Try passing init= option to kernel. " 1497 "See Linux Documentation/admin-guide/init.rst for guidance."); 1498 } 1499 1500 /* Open /dev/console, for stdin/stdout/stderr, this should never fail */ 1501 void __init console_on_rootfs(void) 1502 { 1503 struct file *file = filp_open("/dev/console", O_RDWR, 0); 1504 1505 if (IS_ERR(file)) { 1506 pr_err("Warning: unable to open an initial console.\n"); 1507 return; 1508 } 1509 init_dup(file); 1510 init_dup(file); 1511 init_dup(file); 1512 fput(file); 1513 } 1514 1515 static noinline void __init kernel_init_freeable(void) 1516 { 1517 /* 1518 * Wait until kthreadd is all set-up. 1519 */ 1520 wait_for_completion(&kthreadd_done); 1521 1522 /* Now the scheduler is fully set up and can do blocking allocations */ 1523 gfp_allowed_mask = __GFP_BITS_MASK; 1524 1525 /* 1526 * init can allocate pages on any node 1527 */ 1528 set_mems_allowed(node_states[N_MEMORY]); 1529 1530 cad_pid = get_pid(task_pid(current)); 1531 1532 smp_prepare_cpus(setup_max_cpus); 1533 1534 workqueue_init(); 1535 1536 init_mm_internals(); 1537 1538 rcu_init_tasks_generic(); 1539 do_pre_smp_initcalls(); 1540 lockup_detector_init(); 1541 1542 smp_init(); 1543 sched_init_smp(); 1544 1545 padata_init(); 1546 page_alloc_init_late(); 1547 /* Initialize page ext after all struct pages are initialized. */ 1548 page_ext_init(); 1549 1550 do_basic_setup(); 1551 1552 kunit_run_all_tests(); 1553 1554 wait_for_initramfs(); 1555 console_on_rootfs(); 1556 1557 /* 1558 * check if there is an early userspace init. If yes, let it do all 1559 * the work 1560 */ 1561 if (init_eaccess(ramdisk_execute_command) != 0) { 1562 ramdisk_execute_command = NULL; 1563 prepare_namespace(); 1564 } 1565 1566 /* 1567 * Ok, we have completed the initial bootup, and 1568 * we're essentially up and running. Get rid of the 1569 * initmem segments and start the user-mode stuff.. 1570 * 1571 * rootfs is available now, try loading the public keys 1572 * and default modules 1573 */ 1574 1575 integrity_load_keys(); 1576 } 1577