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/srcu.h> 46 #include <linux/moduleparam.h> 47 #include <linux/kallsyms.h> 48 #include <linux/buildid.h> 49 #include <linux/writeback.h> 50 #include <linux/cpu.h> 51 #include <linux/cpuset.h> 52 #include <linux/cgroup.h> 53 #include <linux/efi.h> 54 #include <linux/tick.h> 55 #include <linux/sched/isolation.h> 56 #include <linux/interrupt.h> 57 #include <linux/taskstats_kern.h> 58 #include <linux/delayacct.h> 59 #include <linux/unistd.h> 60 #include <linux/utsname.h> 61 #include <linux/rmap.h> 62 #include <linux/mempolicy.h> 63 #include <linux/key.h> 64 #include <linux/page_ext.h> 65 #include <linux/debug_locks.h> 66 #include <linux/debugobjects.h> 67 #include <linux/lockdep.h> 68 #include <linux/kmemleak.h> 69 #include <linux/padata.h> 70 #include <linux/pid_namespace.h> 71 #include <linux/device/driver.h> 72 #include <linux/kthread.h> 73 #include <linux/sched.h> 74 #include <linux/sched/init.h> 75 #include <linux/signal.h> 76 #include <linux/idr.h> 77 #include <linux/kgdb.h> 78 #include <linux/ftrace.h> 79 #include <linux/async.h> 80 #include <linux/shmem_fs.h> 81 #include <linux/slab.h> 82 #include <linux/perf_event.h> 83 #include <linux/ptrace.h> 84 #include <linux/pti.h> 85 #include <linux/blkdev.h> 86 #include <linux/elevator.h> 87 #include <linux/sched/clock.h> 88 #include <linux/sched/task.h> 89 #include <linux/sched/task_stack.h> 90 #include <linux/context_tracking.h> 91 #include <linux/random.h> 92 #include <linux/list.h> 93 #include <linux/integrity.h> 94 #include <linux/proc_ns.h> 95 #include <linux/io.h> 96 #include <linux/cache.h> 97 #include <linux/rodata_test.h> 98 #include <linux/jump_label.h> 99 #include <linux/mem_encrypt.h> 100 #include <linux/kcsan.h> 101 #include <linux/init_syscalls.h> 102 #include <linux/stackdepot.h> 103 104 #include <asm/io.h> 105 #include <asm/bugs.h> 106 #include <asm/setup.h> 107 #include <asm/sections.h> 108 #include <asm/cacheflush.h> 109 110 #define CREATE_TRACE_POINTS 111 #include <trace/events/initcall.h> 112 113 #include <kunit/test.h> 114 115 static int kernel_init(void *); 116 117 extern void init_IRQ(void); 118 extern void radix_tree_init(void); 119 120 /* 121 * Debug helper: via this flag we know that we are in 'early bootup code' 122 * where only the boot processor is running with IRQ disabled. This means 123 * two things - IRQ must not be enabled before the flag is cleared and some 124 * operations which are not allowed with IRQ disabled are allowed while the 125 * flag is set. 126 */ 127 bool early_boot_irqs_disabled __read_mostly; 128 129 enum system_states system_state __read_mostly; 130 EXPORT_SYMBOL(system_state); 131 132 /* 133 * Boot command-line arguments 134 */ 135 #define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT 136 #define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT 137 138 extern void time_init(void); 139 /* Default late time init is NULL. archs can override this later. */ 140 void (*__initdata late_time_init)(void); 141 142 /* Untouched command line saved by arch-specific code. */ 143 char __initdata boot_command_line[COMMAND_LINE_SIZE]; 144 /* Untouched saved command line (eg. for /proc) */ 145 char *saved_command_line; 146 /* Command line for parameter parsing */ 147 static char *static_command_line; 148 /* Untouched extra command line */ 149 static char *extra_command_line; 150 /* Extra init arguments */ 151 static char *extra_init_args; 152 153 #ifdef CONFIG_BOOT_CONFIG 154 /* Is bootconfig on command line? */ 155 static bool bootconfig_found; 156 static bool initargs_found; 157 #else 158 # define bootconfig_found false 159 # define initargs_found false 160 #endif 161 162 static char *execute_command; 163 static char *ramdisk_execute_command = "/init"; 164 165 /* 166 * Used to generate warnings if static_key manipulation functions are used 167 * before jump_label_init is called. 168 */ 169 bool static_key_initialized __read_mostly; 170 EXPORT_SYMBOL_GPL(static_key_initialized); 171 172 /* 173 * If set, this is an indication to the drivers that reset the underlying 174 * device before going ahead with the initialization otherwise driver might 175 * rely on the BIOS and skip the reset operation. 176 * 177 * This is useful if kernel is booting in an unreliable environment. 178 * For ex. kdump situation where previous kernel has crashed, BIOS has been 179 * skipped and devices will be in unknown state. 180 */ 181 unsigned int reset_devices; 182 EXPORT_SYMBOL(reset_devices); 183 184 static int __init set_reset_devices(char *str) 185 { 186 reset_devices = 1; 187 return 1; 188 } 189 190 __setup("reset_devices", set_reset_devices); 191 192 static const char *argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; 193 const char *envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; 194 static const char *panic_later, *panic_param; 195 196 extern const struct obs_kernel_param __setup_start[], __setup_end[]; 197 198 static bool __init obsolete_checksetup(char *line) 199 { 200 const struct obs_kernel_param *p; 201 bool had_early_param = false; 202 203 p = __setup_start; 204 do { 205 int n = strlen(p->str); 206 if (parameqn(line, p->str, n)) { 207 if (p->early) { 208 /* Already done in parse_early_param? 209 * (Needs exact match on param part). 210 * Keep iterating, as we can have early 211 * params and __setups of same names 8( */ 212 if (line[n] == '\0' || line[n] == '=') 213 had_early_param = true; 214 } else if (!p->setup_func) { 215 pr_warn("Parameter %s is obsolete, ignored\n", 216 p->str); 217 return true; 218 } else if (p->setup_func(line + n)) 219 return true; 220 } 221 p++; 222 } while (p < __setup_end); 223 224 return had_early_param; 225 } 226 227 /* 228 * This should be approx 2 Bo*oMips to start (note initial shift), and will 229 * still work even if initially too large, it will just take slightly longer 230 */ 231 unsigned long loops_per_jiffy = (1<<12); 232 EXPORT_SYMBOL(loops_per_jiffy); 233 234 static int __init debug_kernel(char *str) 235 { 236 console_loglevel = CONSOLE_LOGLEVEL_DEBUG; 237 return 0; 238 } 239 240 static int __init quiet_kernel(char *str) 241 { 242 console_loglevel = CONSOLE_LOGLEVEL_QUIET; 243 return 0; 244 } 245 246 early_param("debug", debug_kernel); 247 early_param("quiet", quiet_kernel); 248 249 static int __init loglevel(char *str) 250 { 251 int newlevel; 252 253 /* 254 * Only update loglevel value when a correct setting was passed, 255 * to prevent blind crashes (when loglevel being set to 0) that 256 * are quite hard to debug 257 */ 258 if (get_option(&str, &newlevel)) { 259 console_loglevel = newlevel; 260 return 0; 261 } 262 263 return -EINVAL; 264 } 265 266 early_param("loglevel", loglevel); 267 268 #ifdef CONFIG_BLK_DEV_INITRD 269 static void * __init get_boot_config_from_initrd(u32 *_size, u32 *_csum) 270 { 271 u32 size, csum; 272 char *data; 273 u32 *hdr; 274 int i; 275 276 if (!initrd_end) 277 return NULL; 278 279 data = (char *)initrd_end - BOOTCONFIG_MAGIC_LEN; 280 /* 281 * Since Grub may align the size of initrd to 4, we must 282 * check the preceding 3 bytes as well. 283 */ 284 for (i = 0; i < 4; i++) { 285 if (!memcmp(data, BOOTCONFIG_MAGIC, BOOTCONFIG_MAGIC_LEN)) 286 goto found; 287 data--; 288 } 289 return NULL; 290 291 found: 292 hdr = (u32 *)(data - 8); 293 size = le32_to_cpu(hdr[0]); 294 csum = le32_to_cpu(hdr[1]); 295 296 data = ((void *)hdr) - size; 297 if ((unsigned long)data < initrd_start) { 298 pr_err("bootconfig size %d is greater than initrd size %ld\n", 299 size, initrd_end - initrd_start); 300 return NULL; 301 } 302 303 /* Remove bootconfig from initramfs/initrd */ 304 initrd_end = (unsigned long)data; 305 if (_size) 306 *_size = size; 307 if (_csum) 308 *_csum = csum; 309 310 return data; 311 } 312 #else 313 static void * __init get_boot_config_from_initrd(u32 *_size, u32 *_csum) 314 { 315 return NULL; 316 } 317 #endif 318 319 #ifdef CONFIG_BOOT_CONFIG 320 321 static char xbc_namebuf[XBC_KEYLEN_MAX] __initdata; 322 323 #define rest(dst, end) ((end) > (dst) ? (end) - (dst) : 0) 324 325 static int __init xbc_snprint_cmdline(char *buf, size_t size, 326 struct xbc_node *root) 327 { 328 struct xbc_node *knode, *vnode; 329 char *end = buf + size; 330 const char *val; 331 int ret; 332 333 xbc_node_for_each_key_value(root, knode, val) { 334 ret = xbc_node_compose_key_after(root, knode, 335 xbc_namebuf, XBC_KEYLEN_MAX); 336 if (ret < 0) 337 return ret; 338 339 vnode = xbc_node_get_child(knode); 340 if (!vnode) { 341 ret = snprintf(buf, rest(buf, end), "%s ", xbc_namebuf); 342 if (ret < 0) 343 return ret; 344 buf += ret; 345 continue; 346 } 347 xbc_array_for_each_value(vnode, val) { 348 ret = snprintf(buf, rest(buf, end), "%s=\"%s\" ", 349 xbc_namebuf, val); 350 if (ret < 0) 351 return ret; 352 buf += ret; 353 } 354 } 355 356 return buf - (end - size); 357 } 358 #undef rest 359 360 /* Make an extra command line under given key word */ 361 static char * __init xbc_make_cmdline(const char *key) 362 { 363 struct xbc_node *root; 364 char *new_cmdline; 365 int ret, len = 0; 366 367 root = xbc_find_node(key); 368 if (!root) 369 return NULL; 370 371 /* Count required buffer size */ 372 len = xbc_snprint_cmdline(NULL, 0, root); 373 if (len <= 0) 374 return NULL; 375 376 new_cmdline = memblock_alloc(len + 1, SMP_CACHE_BYTES); 377 if (!new_cmdline) { 378 pr_err("Failed to allocate memory for extra kernel cmdline.\n"); 379 return NULL; 380 } 381 382 ret = xbc_snprint_cmdline(new_cmdline, len + 1, root); 383 if (ret < 0 || ret > len) { 384 pr_err("Failed to print extra kernel cmdline.\n"); 385 return NULL; 386 } 387 388 return new_cmdline; 389 } 390 391 static int __init bootconfig_params(char *param, char *val, 392 const char *unused, void *arg) 393 { 394 if (strcmp(param, "bootconfig") == 0) { 395 bootconfig_found = true; 396 } 397 return 0; 398 } 399 400 static int __init warn_bootconfig(char *str) 401 { 402 /* The 'bootconfig' has been handled by bootconfig_params(). */ 403 return 0; 404 } 405 406 static void __init setup_boot_config(void) 407 { 408 static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata; 409 const char *msg; 410 int pos; 411 u32 size, csum; 412 char *data, *copy, *err; 413 int ret; 414 415 /* Cut out the bootconfig data even if we have no bootconfig option */ 416 data = get_boot_config_from_initrd(&size, &csum); 417 418 strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); 419 err = parse_args("bootconfig", tmp_cmdline, NULL, 0, 0, 0, NULL, 420 bootconfig_params); 421 422 if (IS_ERR(err) || !bootconfig_found) 423 return; 424 425 /* parse_args() stops at '--' and returns an address */ 426 if (err) 427 initargs_found = true; 428 429 if (!data) { 430 pr_err("'bootconfig' found on command line, but no bootconfig found\n"); 431 return; 432 } 433 434 if (size >= XBC_DATA_MAX) { 435 pr_err("bootconfig size %d greater than max size %d\n", 436 size, XBC_DATA_MAX); 437 return; 438 } 439 440 if (xbc_calc_checksum(data, size) != csum) { 441 pr_err("bootconfig checksum failed\n"); 442 return; 443 } 444 445 copy = memblock_alloc(size + 1, SMP_CACHE_BYTES); 446 if (!copy) { 447 pr_err("Failed to allocate memory for bootconfig\n"); 448 return; 449 } 450 451 memcpy(copy, data, size); 452 copy[size] = '\0'; 453 454 ret = xbc_init(copy, &msg, &pos); 455 if (ret < 0) { 456 if (pos < 0) 457 pr_err("Failed to init bootconfig: %s.\n", msg); 458 else 459 pr_err("Failed to parse bootconfig: %s at %d.\n", 460 msg, pos); 461 } else { 462 pr_info("Load bootconfig: %d bytes %d nodes\n", size, ret); 463 /* keys starting with "kernel." are passed via cmdline */ 464 extra_command_line = xbc_make_cmdline("kernel"); 465 /* Also, "init." keys are init arguments */ 466 extra_init_args = xbc_make_cmdline("init"); 467 } 468 return; 469 } 470 471 #else 472 473 static void __init setup_boot_config(void) 474 { 475 /* Remove bootconfig data from initrd */ 476 get_boot_config_from_initrd(NULL, NULL); 477 } 478 479 static int __init warn_bootconfig(char *str) 480 { 481 pr_warn("WARNING: 'bootconfig' found on the kernel command line but CONFIG_BOOT_CONFIG is not set.\n"); 482 return 0; 483 } 484 #endif 485 early_param("bootconfig", warn_bootconfig); 486 487 /* Change NUL term back to "=", to make "param" the whole string. */ 488 static void __init repair_env_string(char *param, char *val) 489 { 490 if (val) { 491 /* param=val or param="val"? */ 492 if (val == param+strlen(param)+1) 493 val[-1] = '='; 494 else if (val == param+strlen(param)+2) { 495 val[-2] = '='; 496 memmove(val-1, val, strlen(val)+1); 497 } else 498 BUG(); 499 } 500 } 501 502 /* Anything after -- gets handed straight to init. */ 503 static int __init set_init_arg(char *param, char *val, 504 const char *unused, void *arg) 505 { 506 unsigned int i; 507 508 if (panic_later) 509 return 0; 510 511 repair_env_string(param, val); 512 513 for (i = 0; argv_init[i]; i++) { 514 if (i == MAX_INIT_ARGS) { 515 panic_later = "init"; 516 panic_param = param; 517 return 0; 518 } 519 } 520 argv_init[i] = param; 521 return 0; 522 } 523 524 /* 525 * Unknown boot options get handed to init, unless they look like 526 * unused parameters (modprobe will find them in /proc/cmdline). 527 */ 528 static int __init unknown_bootoption(char *param, char *val, 529 const char *unused, void *arg) 530 { 531 size_t len = strlen(param); 532 533 repair_env_string(param, val); 534 535 /* Handle obsolete-style parameters */ 536 if (obsolete_checksetup(param)) 537 return 0; 538 539 /* Unused module parameter. */ 540 if (strnchr(param, len, '.')) 541 return 0; 542 543 if (panic_later) 544 return 0; 545 546 if (val) { 547 /* Environment option */ 548 unsigned int i; 549 for (i = 0; envp_init[i]; i++) { 550 if (i == MAX_INIT_ENVS) { 551 panic_later = "env"; 552 panic_param = param; 553 } 554 if (!strncmp(param, envp_init[i], len+1)) 555 break; 556 } 557 envp_init[i] = param; 558 } else { 559 /* Command line option */ 560 unsigned int i; 561 for (i = 0; argv_init[i]; i++) { 562 if (i == MAX_INIT_ARGS) { 563 panic_later = "init"; 564 panic_param = param; 565 } 566 } 567 argv_init[i] = param; 568 } 569 return 0; 570 } 571 572 static int __init init_setup(char *str) 573 { 574 unsigned int i; 575 576 execute_command = str; 577 /* 578 * In case LILO is going to boot us with default command line, 579 * it prepends "auto" before the whole cmdline which makes 580 * the shell think it should execute a script with such name. 581 * So we ignore all arguments entered _before_ init=... [MJ] 582 */ 583 for (i = 1; i < MAX_INIT_ARGS; i++) 584 argv_init[i] = NULL; 585 return 1; 586 } 587 __setup("init=", init_setup); 588 589 static int __init rdinit_setup(char *str) 590 { 591 unsigned int i; 592 593 ramdisk_execute_command = str; 594 /* See "auto" comment in init_setup */ 595 for (i = 1; i < MAX_INIT_ARGS; i++) 596 argv_init[i] = NULL; 597 return 1; 598 } 599 __setup("rdinit=", rdinit_setup); 600 601 #ifndef CONFIG_SMP 602 static const unsigned int setup_max_cpus = NR_CPUS; 603 static inline void setup_nr_cpu_ids(void) { } 604 static inline void smp_prepare_cpus(unsigned int maxcpus) { } 605 #endif 606 607 /* 608 * We need to store the untouched command line for future reference. 609 * We also need to store the touched command line since the parameter 610 * parsing is performed in place, and we should allow a component to 611 * store reference of name/value for future reference. 612 */ 613 static void __init setup_command_line(char *command_line) 614 { 615 size_t len, xlen = 0, ilen = 0; 616 617 if (extra_command_line) 618 xlen = strlen(extra_command_line); 619 if (extra_init_args) 620 ilen = strlen(extra_init_args) + 4; /* for " -- " */ 621 622 len = xlen + strlen(boot_command_line) + 1; 623 624 saved_command_line = memblock_alloc(len + ilen, SMP_CACHE_BYTES); 625 if (!saved_command_line) 626 panic("%s: Failed to allocate %zu bytes\n", __func__, len + ilen); 627 628 static_command_line = memblock_alloc(len, SMP_CACHE_BYTES); 629 if (!static_command_line) 630 panic("%s: Failed to allocate %zu bytes\n", __func__, len); 631 632 if (xlen) { 633 /* 634 * We have to put extra_command_line before boot command 635 * lines because there could be dashes (separator of init 636 * command line) in the command lines. 637 */ 638 strcpy(saved_command_line, extra_command_line); 639 strcpy(static_command_line, extra_command_line); 640 } 641 strcpy(saved_command_line + xlen, boot_command_line); 642 strcpy(static_command_line + xlen, command_line); 643 644 if (ilen) { 645 /* 646 * Append supplemental init boot args to saved_command_line 647 * so that user can check what command line options passed 648 * to init. 649 */ 650 len = strlen(saved_command_line); 651 if (initargs_found) { 652 saved_command_line[len++] = ' '; 653 } else { 654 strcpy(saved_command_line + len, " -- "); 655 len += 4; 656 } 657 658 strcpy(saved_command_line + len, extra_init_args); 659 } 660 } 661 662 /* 663 * We need to finalize in a non-__init function or else race conditions 664 * between the root thread and the init thread may cause start_kernel to 665 * be reaped by free_initmem before the root thread has proceeded to 666 * cpu_idle. 667 * 668 * gcc-3.4 accidentally inlines this function, so use noinline. 669 */ 670 671 static __initdata DECLARE_COMPLETION(kthreadd_done); 672 673 noinline void __ref rest_init(void) 674 { 675 struct task_struct *tsk; 676 int pid; 677 678 rcu_scheduler_starting(); 679 /* 680 * We need to spawn init first so that it obtains pid 1, however 681 * the init task will end up wanting to create kthreads, which, if 682 * we schedule it before we create kthreadd, will OOPS. 683 */ 684 pid = kernel_thread(kernel_init, NULL, CLONE_FS); 685 /* 686 * Pin init on the boot CPU. Task migration is not properly working 687 * until sched_init_smp() has been run. It will set the allowed 688 * CPUs for init to the non isolated CPUs. 689 */ 690 rcu_read_lock(); 691 tsk = find_task_by_pid_ns(pid, &init_pid_ns); 692 tsk->flags |= PF_NO_SETAFFINITY; 693 set_cpus_allowed_ptr(tsk, cpumask_of(smp_processor_id())); 694 rcu_read_unlock(); 695 696 numa_default_policy(); 697 pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES); 698 rcu_read_lock(); 699 kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns); 700 rcu_read_unlock(); 701 702 /* 703 * Enable might_sleep() and smp_processor_id() checks. 704 * They cannot be enabled earlier because with CONFIG_PREEMPTION=y 705 * kernel_thread() would trigger might_sleep() splats. With 706 * CONFIG_PREEMPT_VOLUNTARY=y the init task might have scheduled 707 * already, but it's stuck on the kthreadd_done completion. 708 */ 709 system_state = SYSTEM_SCHEDULING; 710 711 complete(&kthreadd_done); 712 713 /* 714 * The boot idle thread must execute schedule() 715 * at least once to get things moving: 716 */ 717 schedule_preempt_disabled(); 718 /* Call into cpu_idle with preempt disabled */ 719 cpu_startup_entry(CPUHP_ONLINE); 720 } 721 722 /* Check for early params. */ 723 static int __init do_early_param(char *param, char *val, 724 const char *unused, void *arg) 725 { 726 const struct obs_kernel_param *p; 727 728 for (p = __setup_start; p < __setup_end; p++) { 729 if ((p->early && parameq(param, p->str)) || 730 (strcmp(param, "console") == 0 && 731 strcmp(p->str, "earlycon") == 0) 732 ) { 733 if (p->setup_func(val) != 0) 734 pr_warn("Malformed early option '%s'\n", param); 735 } 736 } 737 /* We accept everything at this stage. */ 738 return 0; 739 } 740 741 void __init parse_early_options(char *cmdline) 742 { 743 parse_args("early options", cmdline, NULL, 0, 0, 0, NULL, 744 do_early_param); 745 } 746 747 /* Arch code calls this early on, or if not, just before other parsing. */ 748 void __init parse_early_param(void) 749 { 750 static int done __initdata; 751 static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata; 752 753 if (done) 754 return; 755 756 /* All fall through to do_early_param. */ 757 strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); 758 parse_early_options(tmp_cmdline); 759 done = 1; 760 } 761 762 void __init __weak arch_post_acpi_subsys_init(void) { } 763 764 void __init __weak smp_setup_processor_id(void) 765 { 766 } 767 768 # if THREAD_SIZE >= PAGE_SIZE 769 void __init __weak thread_stack_cache_init(void) 770 { 771 } 772 #endif 773 774 void __init __weak mem_encrypt_init(void) { } 775 776 void __init __weak poking_init(void) { } 777 778 void __init __weak pgtable_cache_init(void) { } 779 780 bool initcall_debug; 781 core_param(initcall_debug, initcall_debug, bool, 0644); 782 783 #ifdef TRACEPOINTS_ENABLED 784 static void __init initcall_debug_enable(void); 785 #else 786 static inline void initcall_debug_enable(void) 787 { 788 } 789 #endif 790 791 /* Report memory auto-initialization states for this boot. */ 792 static void __init report_meminit(void) 793 { 794 const char *stack; 795 796 if (IS_ENABLED(CONFIG_INIT_STACK_ALL_PATTERN)) 797 stack = "all(pattern)"; 798 else if (IS_ENABLED(CONFIG_INIT_STACK_ALL_ZERO)) 799 stack = "all(zero)"; 800 else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL)) 801 stack = "byref_all(zero)"; 802 else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF)) 803 stack = "byref(zero)"; 804 else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_USER)) 805 stack = "__user(zero)"; 806 else 807 stack = "off"; 808 809 pr_info("mem auto-init: stack:%s, heap alloc:%s, heap free:%s\n", 810 stack, want_init_on_alloc(GFP_KERNEL) ? "on" : "off", 811 want_init_on_free() ? "on" : "off"); 812 if (want_init_on_free()) 813 pr_info("mem auto-init: clearing system memory may take some time...\n"); 814 } 815 816 /* 817 * Set up kernel memory allocators 818 */ 819 static void __init mm_init(void) 820 { 821 /* 822 * page_ext requires contiguous pages, 823 * bigger than MAX_ORDER unless SPARSEMEM. 824 */ 825 page_ext_init_flatmem(); 826 init_mem_debugging_and_hardening(); 827 kfence_alloc_pool(); 828 report_meminit(); 829 stack_depot_init(); 830 mem_init(); 831 mem_init_print_info(); 832 /* page_owner must be initialized after buddy is ready */ 833 page_ext_init_flatmem_late(); 834 kmem_cache_init(); 835 kmemleak_init(); 836 pgtable_init(); 837 debug_objects_mem_init(); 838 vmalloc_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 #ifdef CONFIG_HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET 846 DEFINE_STATIC_KEY_MAYBE_RO(CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT, 847 randomize_kstack_offset); 848 DEFINE_PER_CPU(u32, kstack_offset); 849 850 static int __init early_randomize_kstack_offset(char *buf) 851 { 852 int ret; 853 bool bool_result; 854 855 ret = kstrtobool(buf, &bool_result); 856 if (ret) 857 return ret; 858 859 if (bool_result) 860 static_branch_enable(&randomize_kstack_offset); 861 else 862 static_branch_disable(&randomize_kstack_offset); 863 return 0; 864 } 865 early_param("randomize_kstack_offset", early_randomize_kstack_offset); 866 #endif 867 868 void __init __weak arch_call_rest_init(void) 869 { 870 rest_init(); 871 } 872 873 static void __init print_unknown_bootoptions(void) 874 { 875 char *unknown_options; 876 char *end; 877 const char *const *p; 878 size_t len; 879 880 if (panic_later || (!argv_init[1] && !envp_init[2])) 881 return; 882 883 /* 884 * Determine how many options we have to print out, plus a space 885 * before each 886 */ 887 len = 1; /* null terminator */ 888 for (p = &argv_init[1]; *p; p++) { 889 len++; 890 len += strlen(*p); 891 } 892 for (p = &envp_init[2]; *p; p++) { 893 len++; 894 len += strlen(*p); 895 } 896 897 unknown_options = memblock_alloc(len, SMP_CACHE_BYTES); 898 if (!unknown_options) { 899 pr_err("%s: Failed to allocate %zu bytes\n", 900 __func__, len); 901 return; 902 } 903 end = unknown_options; 904 905 for (p = &argv_init[1]; *p; p++) 906 end += sprintf(end, " %s", *p); 907 for (p = &envp_init[2]; *p; p++) 908 end += sprintf(end, " %s", *p); 909 910 pr_notice("Unknown command line parameters:%s\n", unknown_options); 911 memblock_free(__pa(unknown_options), len); 912 } 913 914 asmlinkage __visible void __init __no_sanitize_address start_kernel(void) 915 { 916 char *command_line; 917 char *after_dashes; 918 919 set_task_stack_end_magic(&init_task); 920 smp_setup_processor_id(); 921 debug_objects_early_init(); 922 init_vmlinux_build_id(); 923 924 cgroup_init_early(); 925 926 local_irq_disable(); 927 early_boot_irqs_disabled = true; 928 929 /* 930 * Interrupts are still disabled. Do necessary setups, then 931 * enable them. 932 */ 933 boot_cpu_init(); 934 page_address_init(); 935 pr_notice("%s", linux_banner); 936 early_security_init(); 937 setup_arch(&command_line); 938 setup_boot_config(); 939 setup_command_line(command_line); 940 setup_nr_cpu_ids(); 941 setup_per_cpu_areas(); 942 smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ 943 boot_cpu_hotplug_init(); 944 945 build_all_zonelists(NULL); 946 page_alloc_init(); 947 948 pr_notice("Kernel command line: %s\n", saved_command_line); 949 /* parameters may set static keys */ 950 jump_label_init(); 951 parse_early_param(); 952 after_dashes = parse_args("Booting kernel", 953 static_command_line, __start___param, 954 __stop___param - __start___param, 955 -1, -1, NULL, &unknown_bootoption); 956 print_unknown_bootoptions(); 957 if (!IS_ERR_OR_NULL(after_dashes)) 958 parse_args("Setting init args", after_dashes, NULL, 0, -1, -1, 959 NULL, set_init_arg); 960 if (extra_init_args) 961 parse_args("Setting extra init args", extra_init_args, 962 NULL, 0, -1, -1, NULL, set_init_arg); 963 964 /* 965 * These use large bootmem allocations and must precede 966 * kmem_cache_init() 967 */ 968 setup_log_buf(0); 969 vfs_caches_init_early(); 970 sort_main_extable(); 971 trap_init(); 972 mm_init(); 973 974 ftrace_init(); 975 976 /* trace_printk can be enabled here */ 977 early_trace_init(); 978 979 /* 980 * Set up the scheduler prior starting any interrupts (such as the 981 * timer interrupt). Full topology setup happens at smp_init() 982 * time - but meanwhile we still have a functioning scheduler. 983 */ 984 sched_init(); 985 986 if (WARN(!irqs_disabled(), 987 "Interrupts were enabled *very* early, fixing it\n")) 988 local_irq_disable(); 989 radix_tree_init(); 990 991 /* 992 * Set up housekeeping before setting up workqueues to allow the unbound 993 * workqueue to take non-housekeeping into account. 994 */ 995 housekeeping_init(); 996 997 /* 998 * Allow workqueue creation and work item queueing/cancelling 999 * early. Work item execution depends on kthreads and starts after 1000 * workqueue_init(). 1001 */ 1002 workqueue_init_early(); 1003 1004 rcu_init(); 1005 1006 /* Trace events are available after this */ 1007 trace_init(); 1008 1009 if (initcall_debug) 1010 initcall_debug_enable(); 1011 1012 context_tracking_init(); 1013 /* init some links before init_ISA_irqs() */ 1014 early_irq_init(); 1015 init_IRQ(); 1016 tick_init(); 1017 rcu_init_nohz(); 1018 init_timers(); 1019 srcu_init(); 1020 hrtimers_init(); 1021 softirq_init(); 1022 timekeeping_init(); 1023 kfence_init(); 1024 1025 /* 1026 * For best initial stack canary entropy, prepare it after: 1027 * - setup_arch() for any UEFI RNG entropy and boot cmdline access 1028 * - timekeeping_init() for ktime entropy used in rand_initialize() 1029 * - rand_initialize() to get any arch-specific entropy like RDRAND 1030 * - add_latent_entropy() to get any latent entropy 1031 * - adding command line entropy 1032 */ 1033 rand_initialize(); 1034 add_latent_entropy(); 1035 add_device_randomness(command_line, strlen(command_line)); 1036 boot_init_stack_canary(); 1037 1038 time_init(); 1039 perf_event_init(); 1040 profile_init(); 1041 call_function_init(); 1042 WARN(!irqs_disabled(), "Interrupts were enabled early\n"); 1043 1044 early_boot_irqs_disabled = false; 1045 local_irq_enable(); 1046 1047 kmem_cache_init_late(); 1048 1049 /* 1050 * HACK ALERT! This is early. We're enabling the console before 1051 * we've done PCI setups etc, and console_init() must be aware of 1052 * this. But we do want output early, in case something goes wrong. 1053 */ 1054 console_init(); 1055 if (panic_later) 1056 panic("Too many boot %s vars at `%s'", panic_later, 1057 panic_param); 1058 1059 lockdep_init(); 1060 1061 /* 1062 * Need to run this when irqs are enabled, because it wants 1063 * to self-test [hard/soft]-irqs on/off lock inversion bugs 1064 * too: 1065 */ 1066 locking_selftest(); 1067 1068 /* 1069 * This needs to be called before any devices perform DMA 1070 * operations that might use the SWIOTLB bounce buffers. It will 1071 * mark the bounce buffers as decrypted so that their usage will 1072 * not cause "plain-text" data to be decrypted when accessed. 1073 */ 1074 mem_encrypt_init(); 1075 1076 #ifdef CONFIG_BLK_DEV_INITRD 1077 if (initrd_start && !initrd_below_start_ok && 1078 page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) { 1079 pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n", 1080 page_to_pfn(virt_to_page((void *)initrd_start)), 1081 min_low_pfn); 1082 initrd_start = 0; 1083 } 1084 #endif 1085 setup_per_cpu_pageset(); 1086 numa_policy_init(); 1087 acpi_early_init(); 1088 if (late_time_init) 1089 late_time_init(); 1090 sched_clock_init(); 1091 calibrate_delay(); 1092 pid_idr_init(); 1093 anon_vma_init(); 1094 #ifdef CONFIG_X86 1095 if (efi_enabled(EFI_RUNTIME_SERVICES)) 1096 efi_enter_virtual_mode(); 1097 #endif 1098 thread_stack_cache_init(); 1099 cred_init(); 1100 fork_init(); 1101 proc_caches_init(); 1102 uts_ns_init(); 1103 key_init(); 1104 security_init(); 1105 dbg_late_init(); 1106 vfs_caches_init(); 1107 pagecache_init(); 1108 signals_init(); 1109 seq_file_init(); 1110 proc_root_init(); 1111 nsfs_init(); 1112 cpuset_init(); 1113 cgroup_init(); 1114 taskstats_init_early(); 1115 delayacct_init(); 1116 1117 poking_init(); 1118 check_bugs(); 1119 1120 acpi_subsystem_init(); 1121 arch_post_acpi_subsys_init(); 1122 kcsan_init(); 1123 1124 /* Do the rest non-__init'ed, we're now alive */ 1125 arch_call_rest_init(); 1126 1127 prevent_tail_call_optimization(); 1128 } 1129 1130 /* Call all constructor functions linked into the kernel. */ 1131 static void __init do_ctors(void) 1132 { 1133 /* 1134 * For UML, the constructors have already been called by the 1135 * normal setup code as it's just a normal ELF binary, so we 1136 * cannot do it again - but we do need CONFIG_CONSTRUCTORS 1137 * even on UML for modules. 1138 */ 1139 #if defined(CONFIG_CONSTRUCTORS) && !defined(CONFIG_UML) 1140 ctor_fn_t *fn = (ctor_fn_t *) __ctors_start; 1141 1142 for (; fn < (ctor_fn_t *) __ctors_end; fn++) 1143 (*fn)(); 1144 #endif 1145 } 1146 1147 #ifdef CONFIG_KALLSYMS 1148 struct blacklist_entry { 1149 struct list_head next; 1150 char *buf; 1151 }; 1152 1153 static __initdata_or_module LIST_HEAD(blacklisted_initcalls); 1154 1155 static int __init initcall_blacklist(char *str) 1156 { 1157 char *str_entry; 1158 struct blacklist_entry *entry; 1159 1160 /* str argument is a comma-separated list of functions */ 1161 do { 1162 str_entry = strsep(&str, ","); 1163 if (str_entry) { 1164 pr_debug("blacklisting initcall %s\n", str_entry); 1165 entry = memblock_alloc(sizeof(*entry), 1166 SMP_CACHE_BYTES); 1167 if (!entry) 1168 panic("%s: Failed to allocate %zu bytes\n", 1169 __func__, sizeof(*entry)); 1170 entry->buf = memblock_alloc(strlen(str_entry) + 1, 1171 SMP_CACHE_BYTES); 1172 if (!entry->buf) 1173 panic("%s: Failed to allocate %zu bytes\n", 1174 __func__, strlen(str_entry) + 1); 1175 strcpy(entry->buf, str_entry); 1176 list_add(&entry->next, &blacklisted_initcalls); 1177 } 1178 } while (str_entry); 1179 1180 return 0; 1181 } 1182 1183 static bool __init_or_module initcall_blacklisted(initcall_t fn) 1184 { 1185 struct blacklist_entry *entry; 1186 char fn_name[KSYM_SYMBOL_LEN]; 1187 unsigned long addr; 1188 1189 if (list_empty(&blacklisted_initcalls)) 1190 return false; 1191 1192 addr = (unsigned long) dereference_function_descriptor(fn); 1193 sprint_symbol_no_offset(fn_name, addr); 1194 1195 /* 1196 * fn will be "function_name [module_name]" where [module_name] is not 1197 * displayed for built-in init functions. Strip off the [module_name]. 1198 */ 1199 strreplace(fn_name, ' ', '\0'); 1200 1201 list_for_each_entry(entry, &blacklisted_initcalls, next) { 1202 if (!strcmp(fn_name, entry->buf)) { 1203 pr_debug("initcall %s blacklisted\n", fn_name); 1204 return true; 1205 } 1206 } 1207 1208 return false; 1209 } 1210 #else 1211 static int __init initcall_blacklist(char *str) 1212 { 1213 pr_warn("initcall_blacklist requires CONFIG_KALLSYMS\n"); 1214 return 0; 1215 } 1216 1217 static bool __init_or_module initcall_blacklisted(initcall_t fn) 1218 { 1219 return false; 1220 } 1221 #endif 1222 __setup("initcall_blacklist=", initcall_blacklist); 1223 1224 static __init_or_module void 1225 trace_initcall_start_cb(void *data, initcall_t fn) 1226 { 1227 ktime_t *calltime = (ktime_t *)data; 1228 1229 printk(KERN_DEBUG "calling %pS @ %i\n", fn, task_pid_nr(current)); 1230 *calltime = ktime_get(); 1231 } 1232 1233 static __init_or_module void 1234 trace_initcall_finish_cb(void *data, initcall_t fn, int ret) 1235 { 1236 ktime_t *calltime = (ktime_t *)data; 1237 ktime_t delta, rettime; 1238 unsigned long long duration; 1239 1240 rettime = ktime_get(); 1241 delta = ktime_sub(rettime, *calltime); 1242 duration = (unsigned long long) ktime_to_ns(delta) >> 10; 1243 printk(KERN_DEBUG "initcall %pS returned %d after %lld usecs\n", 1244 fn, ret, duration); 1245 } 1246 1247 static ktime_t initcall_calltime; 1248 1249 #ifdef TRACEPOINTS_ENABLED 1250 static void __init initcall_debug_enable(void) 1251 { 1252 int ret; 1253 1254 ret = register_trace_initcall_start(trace_initcall_start_cb, 1255 &initcall_calltime); 1256 ret |= register_trace_initcall_finish(trace_initcall_finish_cb, 1257 &initcall_calltime); 1258 WARN(ret, "Failed to register initcall tracepoints\n"); 1259 } 1260 # define do_trace_initcall_start trace_initcall_start 1261 # define do_trace_initcall_finish trace_initcall_finish 1262 #else 1263 static inline void do_trace_initcall_start(initcall_t fn) 1264 { 1265 if (!initcall_debug) 1266 return; 1267 trace_initcall_start_cb(&initcall_calltime, fn); 1268 } 1269 static inline void do_trace_initcall_finish(initcall_t fn, int ret) 1270 { 1271 if (!initcall_debug) 1272 return; 1273 trace_initcall_finish_cb(&initcall_calltime, fn, ret); 1274 } 1275 #endif /* !TRACEPOINTS_ENABLED */ 1276 1277 int __init_or_module do_one_initcall(initcall_t fn) 1278 { 1279 int count = preempt_count(); 1280 char msgbuf[64]; 1281 int ret; 1282 1283 if (initcall_blacklisted(fn)) 1284 return -EPERM; 1285 1286 do_trace_initcall_start(fn); 1287 ret = fn(); 1288 do_trace_initcall_finish(fn, ret); 1289 1290 msgbuf[0] = 0; 1291 1292 if (preempt_count() != count) { 1293 sprintf(msgbuf, "preemption imbalance "); 1294 preempt_count_set(count); 1295 } 1296 if (irqs_disabled()) { 1297 strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf)); 1298 local_irq_enable(); 1299 } 1300 WARN(msgbuf[0], "initcall %pS returned with %s\n", fn, msgbuf); 1301 1302 add_latent_entropy(); 1303 return ret; 1304 } 1305 1306 1307 extern initcall_entry_t __initcall_start[]; 1308 extern initcall_entry_t __initcall0_start[]; 1309 extern initcall_entry_t __initcall1_start[]; 1310 extern initcall_entry_t __initcall2_start[]; 1311 extern initcall_entry_t __initcall3_start[]; 1312 extern initcall_entry_t __initcall4_start[]; 1313 extern initcall_entry_t __initcall5_start[]; 1314 extern initcall_entry_t __initcall6_start[]; 1315 extern initcall_entry_t __initcall7_start[]; 1316 extern initcall_entry_t __initcall_end[]; 1317 1318 static initcall_entry_t *initcall_levels[] __initdata = { 1319 __initcall0_start, 1320 __initcall1_start, 1321 __initcall2_start, 1322 __initcall3_start, 1323 __initcall4_start, 1324 __initcall5_start, 1325 __initcall6_start, 1326 __initcall7_start, 1327 __initcall_end, 1328 }; 1329 1330 /* Keep these in sync with initcalls in include/linux/init.h */ 1331 static const char *initcall_level_names[] __initdata = { 1332 "pure", 1333 "core", 1334 "postcore", 1335 "arch", 1336 "subsys", 1337 "fs", 1338 "device", 1339 "late", 1340 }; 1341 1342 static int __init ignore_unknown_bootoption(char *param, char *val, 1343 const char *unused, void *arg) 1344 { 1345 return 0; 1346 } 1347 1348 static void __init do_initcall_level(int level, char *command_line) 1349 { 1350 initcall_entry_t *fn; 1351 1352 parse_args(initcall_level_names[level], 1353 command_line, __start___param, 1354 __stop___param - __start___param, 1355 level, level, 1356 NULL, ignore_unknown_bootoption); 1357 1358 trace_initcall_level(initcall_level_names[level]); 1359 for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++) 1360 do_one_initcall(initcall_from_entry(fn)); 1361 } 1362 1363 static void __init do_initcalls(void) 1364 { 1365 int level; 1366 size_t len = strlen(saved_command_line) + 1; 1367 char *command_line; 1368 1369 command_line = kzalloc(len, GFP_KERNEL); 1370 if (!command_line) 1371 panic("%s: Failed to allocate %zu bytes\n", __func__, len); 1372 1373 for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) { 1374 /* Parser modifies command_line, restore it each time */ 1375 strcpy(command_line, saved_command_line); 1376 do_initcall_level(level, command_line); 1377 } 1378 1379 kfree(command_line); 1380 } 1381 1382 /* 1383 * Ok, the machine is now initialized. None of the devices 1384 * have been touched yet, but the CPU subsystem is up and 1385 * running, and memory and process management works. 1386 * 1387 * Now we can finally start doing some real work.. 1388 */ 1389 static void __init do_basic_setup(void) 1390 { 1391 cpuset_init_smp(); 1392 driver_init(); 1393 init_irq_proc(); 1394 do_ctors(); 1395 usermodehelper_enable(); 1396 do_initcalls(); 1397 } 1398 1399 static void __init do_pre_smp_initcalls(void) 1400 { 1401 initcall_entry_t *fn; 1402 1403 trace_initcall_level("early"); 1404 for (fn = __initcall_start; fn < __initcall0_start; fn++) 1405 do_one_initcall(initcall_from_entry(fn)); 1406 } 1407 1408 static int run_init_process(const char *init_filename) 1409 { 1410 const char *const *p; 1411 1412 argv_init[0] = init_filename; 1413 pr_info("Run %s as init process\n", init_filename); 1414 pr_debug(" with arguments:\n"); 1415 for (p = argv_init; *p; p++) 1416 pr_debug(" %s\n", *p); 1417 pr_debug(" with environment:\n"); 1418 for (p = envp_init; *p; p++) 1419 pr_debug(" %s\n", *p); 1420 return kernel_execve(init_filename, argv_init, envp_init); 1421 } 1422 1423 static int try_to_run_init_process(const char *init_filename) 1424 { 1425 int ret; 1426 1427 ret = run_init_process(init_filename); 1428 1429 if (ret && ret != -ENOENT) { 1430 pr_err("Starting init: %s exists but couldn't execute it (error %d)\n", 1431 init_filename, ret); 1432 } 1433 1434 return ret; 1435 } 1436 1437 static noinline void __init kernel_init_freeable(void); 1438 1439 #if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX) 1440 bool rodata_enabled __ro_after_init = true; 1441 static int __init set_debug_rodata(char *str) 1442 { 1443 return strtobool(str, &rodata_enabled); 1444 } 1445 __setup("rodata=", set_debug_rodata); 1446 #endif 1447 1448 #ifdef CONFIG_STRICT_KERNEL_RWX 1449 static void mark_readonly(void) 1450 { 1451 if (rodata_enabled) { 1452 /* 1453 * load_module() results in W+X mappings, which are cleaned 1454 * up with call_rcu(). Let's make sure that queued work is 1455 * flushed so that we don't hit false positives looking for 1456 * insecure pages which are W+X. 1457 */ 1458 rcu_barrier(); 1459 mark_rodata_ro(); 1460 rodata_test(); 1461 } else 1462 pr_info("Kernel memory protection disabled.\n"); 1463 } 1464 #elif defined(CONFIG_ARCH_HAS_STRICT_KERNEL_RWX) 1465 static inline void mark_readonly(void) 1466 { 1467 pr_warn("Kernel memory protection not selected by kernel config.\n"); 1468 } 1469 #else 1470 static inline void mark_readonly(void) 1471 { 1472 pr_warn("This architecture does not have kernel memory protection.\n"); 1473 } 1474 #endif 1475 1476 void __weak free_initmem(void) 1477 { 1478 free_initmem_default(POISON_FREE_INITMEM); 1479 } 1480 1481 static int __ref kernel_init(void *unused) 1482 { 1483 int ret; 1484 1485 /* 1486 * Wait until kthreadd is all set-up. 1487 */ 1488 wait_for_completion(&kthreadd_done); 1489 1490 kernel_init_freeable(); 1491 /* need to finish all async __init code before freeing the memory */ 1492 async_synchronize_full(); 1493 kprobe_free_init_mem(); 1494 ftrace_free_init_mem(); 1495 kgdb_free_init_mem(); 1496 free_initmem(); 1497 mark_readonly(); 1498 1499 /* 1500 * Kernel mappings are now finalized - update the userspace page-table 1501 * to finalize PTI. 1502 */ 1503 pti_finalize(); 1504 1505 system_state = SYSTEM_RUNNING; 1506 numa_default_policy(); 1507 1508 rcu_end_inkernel_boot(); 1509 1510 do_sysctl_args(); 1511 1512 if (ramdisk_execute_command) { 1513 ret = run_init_process(ramdisk_execute_command); 1514 if (!ret) 1515 return 0; 1516 pr_err("Failed to execute %s (error %d)\n", 1517 ramdisk_execute_command, ret); 1518 } 1519 1520 /* 1521 * We try each of these until one succeeds. 1522 * 1523 * The Bourne shell can be used instead of init if we are 1524 * trying to recover a really broken machine. 1525 */ 1526 if (execute_command) { 1527 ret = run_init_process(execute_command); 1528 if (!ret) 1529 return 0; 1530 panic("Requested init %s failed (error %d).", 1531 execute_command, ret); 1532 } 1533 1534 if (CONFIG_DEFAULT_INIT[0] != '\0') { 1535 ret = run_init_process(CONFIG_DEFAULT_INIT); 1536 if (ret) 1537 pr_err("Default init %s failed (error %d)\n", 1538 CONFIG_DEFAULT_INIT, ret); 1539 else 1540 return 0; 1541 } 1542 1543 if (!try_to_run_init_process("/sbin/init") || 1544 !try_to_run_init_process("/etc/init") || 1545 !try_to_run_init_process("/bin/init") || 1546 !try_to_run_init_process("/bin/sh")) 1547 return 0; 1548 1549 panic("No working init found. Try passing init= option to kernel. " 1550 "See Linux Documentation/admin-guide/init.rst for guidance."); 1551 } 1552 1553 /* Open /dev/console, for stdin/stdout/stderr, this should never fail */ 1554 void __init console_on_rootfs(void) 1555 { 1556 struct file *file = filp_open("/dev/console", O_RDWR, 0); 1557 1558 if (IS_ERR(file)) { 1559 pr_err("Warning: unable to open an initial console.\n"); 1560 return; 1561 } 1562 init_dup(file); 1563 init_dup(file); 1564 init_dup(file); 1565 fput(file); 1566 } 1567 1568 static noinline void __init kernel_init_freeable(void) 1569 { 1570 /* Now the scheduler is fully set up and can do blocking allocations */ 1571 gfp_allowed_mask = __GFP_BITS_MASK; 1572 1573 /* 1574 * init can allocate pages on any node 1575 */ 1576 set_mems_allowed(node_states[N_MEMORY]); 1577 1578 cad_pid = get_pid(task_pid(current)); 1579 1580 smp_prepare_cpus(setup_max_cpus); 1581 1582 workqueue_init(); 1583 1584 init_mm_internals(); 1585 1586 rcu_init_tasks_generic(); 1587 do_pre_smp_initcalls(); 1588 lockup_detector_init(); 1589 1590 smp_init(); 1591 sched_init_smp(); 1592 1593 padata_init(); 1594 page_alloc_init_late(); 1595 /* Initialize page ext after all struct pages are initialized. */ 1596 page_ext_init(); 1597 1598 do_basic_setup(); 1599 1600 kunit_run_all_tests(); 1601 1602 wait_for_initramfs(); 1603 console_on_rootfs(); 1604 1605 /* 1606 * check if there is an early userspace init. If yes, let it do all 1607 * the work 1608 */ 1609 if (init_eaccess(ramdisk_execute_command) != 0) { 1610 ramdisk_execute_command = NULL; 1611 prepare_namespace(); 1612 } 1613 1614 /* 1615 * Ok, we have completed the initial bootup, and 1616 * we're essentially up and running. Get rid of the 1617 * initmem segments and start the user-mode stuff.. 1618 * 1619 * rootfs is available now, try loading the public keys 1620 * and default modules 1621 */ 1622 1623 integrity_load_keys(); 1624 } 1625