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