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/sched/clock.h> 87 #include <linux/sched/task.h> 88 #include <linux/sched/task_stack.h> 89 #include <linux/context_tracking.h> 90 #include <linux/random.h> 91 #include <linux/list.h> 92 #include <linux/integrity.h> 93 #include <linux/proc_ns.h> 94 #include <linux/io.h> 95 #include <linux/cache.h> 96 #include <linux/rodata_test.h> 97 #include <linux/jump_label.h> 98 #include <linux/mem_encrypt.h> 99 #include <linux/kcsan.h> 100 #include <linux/init_syscalls.h> 101 #include <linux/stackdepot.h> 102 103 #include <asm/io.h> 104 #include <asm/bugs.h> 105 #include <asm/setup.h> 106 #include <asm/sections.h> 107 #include <asm/cacheflush.h> 108 109 #define CREATE_TRACE_POINTS 110 #include <trace/events/initcall.h> 111 112 #include <kunit/test.h> 113 114 static int kernel_init(void *); 115 116 extern void init_IRQ(void); 117 extern void radix_tree_init(void); 118 119 /* 120 * Debug helper: via this flag we know that we are in 'early bootup code' 121 * where only the boot processor is running with IRQ disabled. This means 122 * two things - IRQ must not be enabled before the flag is cleared and some 123 * operations which are not allowed with IRQ disabled are allowed while the 124 * flag is set. 125 */ 126 bool early_boot_irqs_disabled __read_mostly; 127 128 enum system_states system_state __read_mostly; 129 EXPORT_SYMBOL(system_state); 130 131 /* 132 * Boot command-line arguments 133 */ 134 #define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT 135 #define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT 136 137 extern void time_init(void); 138 /* Default late time init is NULL. archs can override this later. */ 139 void (*__initdata late_time_init)(void); 140 141 /* Untouched command line saved by arch-specific code. */ 142 char __initdata boot_command_line[COMMAND_LINE_SIZE]; 143 /* Untouched saved command line (eg. for /proc) */ 144 char *saved_command_line; 145 /* Command line for parameter parsing */ 146 static char *static_command_line; 147 /* Untouched extra command line */ 148 static char *extra_command_line; 149 /* Extra init arguments */ 150 static char *extra_init_args; 151 152 #ifdef CONFIG_BOOT_CONFIG 153 /* Is bootconfig on command line? */ 154 static bool bootconfig_found; 155 static size_t initargs_offs; 156 #else 157 # define bootconfig_found false 158 # define initargs_offs 0 159 #endif 160 161 static char *execute_command; 162 static char *ramdisk_execute_command = "/init"; 163 164 /* 165 * Used to generate warnings if static_key manipulation functions are used 166 * before jump_label_init is called. 167 */ 168 bool static_key_initialized __read_mostly; 169 EXPORT_SYMBOL_GPL(static_key_initialized); 170 171 /* 172 * If set, this is an indication to the drivers that reset the underlying 173 * device before going ahead with the initialization otherwise driver might 174 * rely on the BIOS and skip the reset operation. 175 * 176 * This is useful if kernel is booting in an unreliable environment. 177 * For ex. kdump situation where previous kernel has crashed, BIOS has been 178 * skipped and devices will be in unknown state. 179 */ 180 unsigned int reset_devices; 181 EXPORT_SYMBOL(reset_devices); 182 183 static int __init set_reset_devices(char *str) 184 { 185 reset_devices = 1; 186 return 1; 187 } 188 189 __setup("reset_devices", set_reset_devices); 190 191 static const char *argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; 192 const char *envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; 193 static const char *panic_later, *panic_param; 194 195 extern const struct obs_kernel_param __setup_start[], __setup_end[]; 196 197 static bool __init obsolete_checksetup(char *line) 198 { 199 const struct obs_kernel_param *p; 200 bool had_early_param = false; 201 202 p = __setup_start; 203 do { 204 int n = strlen(p->str); 205 if (parameqn(line, p->str, n)) { 206 if (p->early) { 207 /* Already done in parse_early_param? 208 * (Needs exact match on param part). 209 * Keep iterating, as we can have early 210 * params and __setups of same names 8( */ 211 if (line[n] == '\0' || line[n] == '=') 212 had_early_param = true; 213 } else if (!p->setup_func) { 214 pr_warn("Parameter %s is obsolete, ignored\n", 215 p->str); 216 return true; 217 } else if (p->setup_func(line + n)) 218 return true; 219 } 220 p++; 221 } while (p < __setup_end); 222 223 return had_early_param; 224 } 225 226 /* 227 * This should be approx 2 Bo*oMips to start (note initial shift), and will 228 * still work even if initially too large, it will just take slightly longer 229 */ 230 unsigned long loops_per_jiffy = (1<<12); 231 EXPORT_SYMBOL(loops_per_jiffy); 232 233 static int __init debug_kernel(char *str) 234 { 235 console_loglevel = CONSOLE_LOGLEVEL_DEBUG; 236 return 0; 237 } 238 239 static int __init quiet_kernel(char *str) 240 { 241 console_loglevel = CONSOLE_LOGLEVEL_QUIET; 242 return 0; 243 } 244 245 early_param("debug", debug_kernel); 246 early_param("quiet", quiet_kernel); 247 248 static int __init loglevel(char *str) 249 { 250 int newlevel; 251 252 /* 253 * Only update loglevel value when a correct setting was passed, 254 * to prevent blind crashes (when loglevel being set to 0) that 255 * are quite hard to debug 256 */ 257 if (get_option(&str, &newlevel)) { 258 console_loglevel = newlevel; 259 return 0; 260 } 261 262 return -EINVAL; 263 } 264 265 early_param("loglevel", loglevel); 266 267 #ifdef CONFIG_BLK_DEV_INITRD 268 static void * __init get_boot_config_from_initrd(u32 *_size, u32 *_csum) 269 { 270 u32 size, csum; 271 char *data; 272 u32 *hdr; 273 int i; 274 275 if (!initrd_end) 276 return NULL; 277 278 data = (char *)initrd_end - BOOTCONFIG_MAGIC_LEN; 279 /* 280 * Since Grub may align the size of initrd to 4, we must 281 * check the preceding 3 bytes as well. 282 */ 283 for (i = 0; i < 4; i++) { 284 if (!memcmp(data, BOOTCONFIG_MAGIC, BOOTCONFIG_MAGIC_LEN)) 285 goto found; 286 data--; 287 } 288 return NULL; 289 290 found: 291 hdr = (u32 *)(data - 8); 292 size = le32_to_cpu(hdr[0]); 293 csum = le32_to_cpu(hdr[1]); 294 295 data = ((void *)hdr) - size; 296 if ((unsigned long)data < initrd_start) { 297 pr_err("bootconfig size %d is greater than initrd size %ld\n", 298 size, initrd_end - initrd_start); 299 return NULL; 300 } 301 302 /* Remove bootconfig from initramfs/initrd */ 303 initrd_end = (unsigned long)data; 304 if (_size) 305 *_size = size; 306 if (_csum) 307 *_csum = csum; 308 309 return data; 310 } 311 #else 312 static void * __init get_boot_config_from_initrd(u32 *_size, u32 *_csum) 313 { 314 return NULL; 315 } 316 #endif 317 318 #ifdef CONFIG_BOOT_CONFIG 319 320 static char xbc_namebuf[XBC_KEYLEN_MAX] __initdata; 321 322 #define rest(dst, end) ((end) > (dst) ? (end) - (dst) : 0) 323 324 static int __init xbc_snprint_cmdline(char *buf, size_t size, 325 struct xbc_node *root) 326 { 327 struct xbc_node *knode, *vnode; 328 char *end = buf + size; 329 const char *val; 330 int ret; 331 332 xbc_node_for_each_key_value(root, knode, val) { 333 ret = xbc_node_compose_key_after(root, knode, 334 xbc_namebuf, XBC_KEYLEN_MAX); 335 if (ret < 0) 336 return ret; 337 338 vnode = xbc_node_get_child(knode); 339 if (!vnode) { 340 ret = snprintf(buf, rest(buf, end), "%s ", xbc_namebuf); 341 if (ret < 0) 342 return ret; 343 buf += ret; 344 continue; 345 } 346 xbc_array_for_each_value(vnode, val) { 347 ret = snprintf(buf, rest(buf, end), "%s=\"%s\" ", 348 xbc_namebuf, val); 349 if (ret < 0) 350 return ret; 351 buf += ret; 352 } 353 } 354 355 return buf - (end - size); 356 } 357 #undef rest 358 359 /* Make an extra command line under given key word */ 360 static char * __init xbc_make_cmdline(const char *key) 361 { 362 struct xbc_node *root; 363 char *new_cmdline; 364 int ret, len = 0; 365 366 root = xbc_find_node(key); 367 if (!root) 368 return NULL; 369 370 /* Count required buffer size */ 371 len = xbc_snprint_cmdline(NULL, 0, root); 372 if (len <= 0) 373 return NULL; 374 375 new_cmdline = memblock_alloc(len + 1, SMP_CACHE_BYTES); 376 if (!new_cmdline) { 377 pr_err("Failed to allocate memory for extra kernel cmdline.\n"); 378 return NULL; 379 } 380 381 ret = xbc_snprint_cmdline(new_cmdline, len + 1, root); 382 if (ret < 0 || ret > len) { 383 pr_err("Failed to print extra kernel cmdline.\n"); 384 memblock_free(new_cmdline, len + 1); 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, *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 the next param of '--' and returns an address */ 426 if (err) 427 initargs_offs = err - tmp_cmdline; 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 ret = xbc_init(data, size, &msg, &pos); 446 if (ret < 0) { 447 if (pos < 0) 448 pr_err("Failed to init bootconfig: %s.\n", msg); 449 else 450 pr_err("Failed to parse bootconfig: %s at %d.\n", 451 msg, pos); 452 } else { 453 xbc_get_info(&ret, NULL); 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 static void __init exit_boot_config(void) 464 { 465 xbc_exit(); 466 } 467 468 #else /* !CONFIG_BOOT_CONFIG */ 469 470 static void __init setup_boot_config(void) 471 { 472 /* Remove bootconfig data from initrd */ 473 get_boot_config_from_initrd(NULL, NULL); 474 } 475 476 static int __init warn_bootconfig(char *str) 477 { 478 pr_warn("WARNING: 'bootconfig' found on the kernel command line but CONFIG_BOOT_CONFIG is not set.\n"); 479 return 0; 480 } 481 482 #define exit_boot_config() do {} while (0) 483 484 #endif /* CONFIG_BOOT_CONFIG */ 485 486 early_param("bootconfig", warn_bootconfig); 487 488 /* Change NUL term back to "=", to make "param" the whole string. */ 489 static void __init repair_env_string(char *param, char *val) 490 { 491 if (val) { 492 /* param=val or param="val"? */ 493 if (val == param+strlen(param)+1) 494 val[-1] = '='; 495 else if (val == param+strlen(param)+2) { 496 val[-2] = '='; 497 memmove(val-1, val, strlen(val)+1); 498 } else 499 BUG(); 500 } 501 } 502 503 /* Anything after -- gets handed straight to init. */ 504 static int __init set_init_arg(char *param, char *val, 505 const char *unused, void *arg) 506 { 507 unsigned int i; 508 509 if (panic_later) 510 return 0; 511 512 repair_env_string(param, val); 513 514 for (i = 0; argv_init[i]; i++) { 515 if (i == MAX_INIT_ARGS) { 516 panic_later = "init"; 517 panic_param = param; 518 return 0; 519 } 520 } 521 argv_init[i] = param; 522 return 0; 523 } 524 525 /* 526 * Unknown boot options get handed to init, unless they look like 527 * unused parameters (modprobe will find them in /proc/cmdline). 528 */ 529 static int __init unknown_bootoption(char *param, char *val, 530 const char *unused, void *arg) 531 { 532 size_t len = strlen(param); 533 534 repair_env_string(param, val); 535 536 /* Handle obsolete-style parameters */ 537 if (obsolete_checksetup(param)) 538 return 0; 539 540 /* Unused module parameter. */ 541 if (strnchr(param, len, '.')) 542 return 0; 543 544 if (panic_later) 545 return 0; 546 547 if (val) { 548 /* Environment option */ 549 unsigned int i; 550 for (i = 0; envp_init[i]; i++) { 551 if (i == MAX_INIT_ENVS) { 552 panic_later = "env"; 553 panic_param = param; 554 } 555 if (!strncmp(param, envp_init[i], len+1)) 556 break; 557 } 558 envp_init[i] = param; 559 } else { 560 /* Command line option */ 561 unsigned int i; 562 for (i = 0; argv_init[i]; i++) { 563 if (i == MAX_INIT_ARGS) { 564 panic_later = "init"; 565 panic_param = param; 566 } 567 } 568 argv_init[i] = param; 569 } 570 return 0; 571 } 572 573 static int __init init_setup(char *str) 574 { 575 unsigned int i; 576 577 execute_command = str; 578 /* 579 * In case LILO is going to boot us with default command line, 580 * it prepends "auto" before the whole cmdline which makes 581 * the shell think it should execute a script with such name. 582 * So we ignore all arguments entered _before_ init=... [MJ] 583 */ 584 for (i = 1; i < MAX_INIT_ARGS; i++) 585 argv_init[i] = NULL; 586 return 1; 587 } 588 __setup("init=", init_setup); 589 590 static int __init rdinit_setup(char *str) 591 { 592 unsigned int i; 593 594 ramdisk_execute_command = str; 595 /* See "auto" comment in init_setup */ 596 for (i = 1; i < MAX_INIT_ARGS; i++) 597 argv_init[i] = NULL; 598 return 1; 599 } 600 __setup("rdinit=", rdinit_setup); 601 602 #ifndef CONFIG_SMP 603 static const unsigned int setup_max_cpus = NR_CPUS; 604 static inline void setup_nr_cpu_ids(void) { } 605 static inline void smp_prepare_cpus(unsigned int maxcpus) { } 606 #endif 607 608 /* 609 * We need to store the untouched command line for future reference. 610 * We also need to store the touched command line since the parameter 611 * parsing is performed in place, and we should allow a component to 612 * store reference of name/value for future reference. 613 */ 614 static void __init setup_command_line(char *command_line) 615 { 616 size_t len, xlen = 0, ilen = 0; 617 618 if (extra_command_line) 619 xlen = strlen(extra_command_line); 620 if (extra_init_args) 621 ilen = strlen(extra_init_args) + 4; /* for " -- " */ 622 623 len = xlen + strlen(boot_command_line) + 1; 624 625 saved_command_line = memblock_alloc(len + ilen, SMP_CACHE_BYTES); 626 if (!saved_command_line) 627 panic("%s: Failed to allocate %zu bytes\n", __func__, len + ilen); 628 629 static_command_line = memblock_alloc(len, SMP_CACHE_BYTES); 630 if (!static_command_line) 631 panic("%s: Failed to allocate %zu bytes\n", __func__, len); 632 633 if (xlen) { 634 /* 635 * We have to put extra_command_line before boot command 636 * lines because there could be dashes (separator of init 637 * command line) in the command lines. 638 */ 639 strcpy(saved_command_line, extra_command_line); 640 strcpy(static_command_line, extra_command_line); 641 } 642 strcpy(saved_command_line + xlen, boot_command_line); 643 strcpy(static_command_line + xlen, command_line); 644 645 if (ilen) { 646 /* 647 * Append supplemental init boot args to saved_command_line 648 * so that user can check what command line options passed 649 * to init. 650 * The order should always be 651 * " -- "[bootconfig init-param][cmdline init-param] 652 */ 653 if (initargs_offs) { 654 len = xlen + initargs_offs; 655 strcpy(saved_command_line + len, extra_init_args); 656 len += ilen - 4; /* strlen(extra_init_args) */ 657 strcpy(saved_command_line + len, 658 boot_command_line + initargs_offs - 1); 659 } else { 660 len = strlen(saved_command_line); 661 strcpy(saved_command_line + len, " -- "); 662 len += 4; 663 strcpy(saved_command_line + len, extra_init_args); 664 } 665 } 666 } 667 668 /* 669 * We need to finalize in a non-__init function or else race conditions 670 * between the root thread and the init thread may cause start_kernel to 671 * be reaped by free_initmem before the root thread has proceeded to 672 * cpu_idle. 673 * 674 * gcc-3.4 accidentally inlines this function, so use noinline. 675 */ 676 677 static __initdata DECLARE_COMPLETION(kthreadd_done); 678 679 noinline void __ref rest_init(void) 680 { 681 struct task_struct *tsk; 682 int pid; 683 684 rcu_scheduler_starting(); 685 /* 686 * We need to spawn init first so that it obtains pid 1, however 687 * the init task will end up wanting to create kthreads, which, if 688 * we schedule it before we create kthreadd, will OOPS. 689 */ 690 pid = kernel_thread(kernel_init, NULL, CLONE_FS); 691 /* 692 * Pin init on the boot CPU. Task migration is not properly working 693 * until sched_init_smp() has been run. It will set the allowed 694 * CPUs for init to the non isolated CPUs. 695 */ 696 rcu_read_lock(); 697 tsk = find_task_by_pid_ns(pid, &init_pid_ns); 698 tsk->flags |= PF_NO_SETAFFINITY; 699 set_cpus_allowed_ptr(tsk, cpumask_of(smp_processor_id())); 700 rcu_read_unlock(); 701 702 numa_default_policy(); 703 pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES); 704 rcu_read_lock(); 705 kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns); 706 rcu_read_unlock(); 707 708 /* 709 * Enable might_sleep() and smp_processor_id() checks. 710 * They cannot be enabled earlier because with CONFIG_PREEMPTION=y 711 * kernel_thread() would trigger might_sleep() splats. With 712 * CONFIG_PREEMPT_VOLUNTARY=y the init task might have scheduled 713 * already, but it's stuck on the kthreadd_done completion. 714 */ 715 system_state = SYSTEM_SCHEDULING; 716 717 complete(&kthreadd_done); 718 719 /* 720 * The boot idle thread must execute schedule() 721 * at least once to get things moving: 722 */ 723 schedule_preempt_disabled(); 724 /* Call into cpu_idle with preempt disabled */ 725 cpu_startup_entry(CPUHP_ONLINE); 726 } 727 728 /* Check for early params. */ 729 static int __init do_early_param(char *param, char *val, 730 const char *unused, void *arg) 731 { 732 const struct obs_kernel_param *p; 733 734 for (p = __setup_start; p < __setup_end; p++) { 735 if ((p->early && parameq(param, p->str)) || 736 (strcmp(param, "console") == 0 && 737 strcmp(p->str, "earlycon") == 0) 738 ) { 739 if (p->setup_func(val) != 0) 740 pr_warn("Malformed early option '%s'\n", param); 741 } 742 } 743 /* We accept everything at this stage. */ 744 return 0; 745 } 746 747 void __init parse_early_options(char *cmdline) 748 { 749 parse_args("early options", cmdline, NULL, 0, 0, 0, NULL, 750 do_early_param); 751 } 752 753 /* Arch code calls this early on, or if not, just before other parsing. */ 754 void __init parse_early_param(void) 755 { 756 static int done __initdata; 757 static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata; 758 759 if (done) 760 return; 761 762 /* All fall through to do_early_param. */ 763 strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); 764 parse_early_options(tmp_cmdline); 765 done = 1; 766 } 767 768 void __init __weak arch_post_acpi_subsys_init(void) { } 769 770 void __init __weak smp_setup_processor_id(void) 771 { 772 } 773 774 # if THREAD_SIZE >= PAGE_SIZE 775 void __init __weak thread_stack_cache_init(void) 776 { 777 } 778 #endif 779 780 void __init __weak mem_encrypt_init(void) { } 781 782 void __init __weak poking_init(void) { } 783 784 void __init __weak pgtable_cache_init(void) { } 785 786 void __init __weak trap_init(void) { } 787 788 bool initcall_debug; 789 core_param(initcall_debug, initcall_debug, bool, 0644); 790 791 #ifdef TRACEPOINTS_ENABLED 792 static void __init initcall_debug_enable(void); 793 #else 794 static inline void initcall_debug_enable(void) 795 { 796 } 797 #endif 798 799 /* Report memory auto-initialization states for this boot. */ 800 static void __init report_meminit(void) 801 { 802 const char *stack; 803 804 if (IS_ENABLED(CONFIG_INIT_STACK_ALL_PATTERN)) 805 stack = "all(pattern)"; 806 else if (IS_ENABLED(CONFIG_INIT_STACK_ALL_ZERO)) 807 stack = "all(zero)"; 808 else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL)) 809 stack = "byref_all(zero)"; 810 else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF)) 811 stack = "byref(zero)"; 812 else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_USER)) 813 stack = "__user(zero)"; 814 else 815 stack = "off"; 816 817 pr_info("mem auto-init: stack:%s, heap alloc:%s, heap free:%s\n", 818 stack, want_init_on_alloc(GFP_KERNEL) ? "on" : "off", 819 want_init_on_free() ? "on" : "off"); 820 if (want_init_on_free()) 821 pr_info("mem auto-init: clearing system memory may take some time...\n"); 822 } 823 824 /* 825 * Set up kernel memory allocators 826 */ 827 static void __init mm_init(void) 828 { 829 /* 830 * page_ext requires contiguous pages, 831 * bigger than MAX_ORDER unless SPARSEMEM. 832 */ 833 page_ext_init_flatmem(); 834 init_mem_debugging_and_hardening(); 835 kfence_alloc_pool(); 836 report_meminit(); 837 stack_depot_early_init(); 838 mem_init(); 839 mem_init_print_info(); 840 kmem_cache_init(); 841 /* 842 * page_owner must be initialized after buddy is ready, and also after 843 * slab is ready so that stack_depot_init() works properly 844 */ 845 page_ext_init_flatmem_late(); 846 kmemleak_init(); 847 pgtable_init(); 848 debug_objects_mem_init(); 849 vmalloc_init(); 850 /* Should be run before the first non-init thread is created */ 851 init_espfix_bsp(); 852 /* Should be run after espfix64 is set up. */ 853 pti_init(); 854 } 855 856 #ifdef CONFIG_HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET 857 DEFINE_STATIC_KEY_MAYBE_RO(CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT, 858 randomize_kstack_offset); 859 DEFINE_PER_CPU(u32, kstack_offset); 860 861 static int __init early_randomize_kstack_offset(char *buf) 862 { 863 int ret; 864 bool bool_result; 865 866 ret = kstrtobool(buf, &bool_result); 867 if (ret) 868 return ret; 869 870 if (bool_result) 871 static_branch_enable(&randomize_kstack_offset); 872 else 873 static_branch_disable(&randomize_kstack_offset); 874 return 0; 875 } 876 early_param("randomize_kstack_offset", early_randomize_kstack_offset); 877 #endif 878 879 void __init __weak arch_call_rest_init(void) 880 { 881 rest_init(); 882 } 883 884 static void __init print_unknown_bootoptions(void) 885 { 886 char *unknown_options; 887 char *end; 888 const char *const *p; 889 size_t len; 890 891 if (panic_later || (!argv_init[1] && !envp_init[2])) 892 return; 893 894 /* 895 * Determine how many options we have to print out, plus a space 896 * before each 897 */ 898 len = 1; /* null terminator */ 899 for (p = &argv_init[1]; *p; p++) { 900 len++; 901 len += strlen(*p); 902 } 903 for (p = &envp_init[2]; *p; p++) { 904 len++; 905 len += strlen(*p); 906 } 907 908 unknown_options = memblock_alloc(len, SMP_CACHE_BYTES); 909 if (!unknown_options) { 910 pr_err("%s: Failed to allocate %zu bytes\n", 911 __func__, len); 912 return; 913 } 914 end = unknown_options; 915 916 for (p = &argv_init[1]; *p; p++) 917 end += sprintf(end, " %s", *p); 918 for (p = &envp_init[2]; *p; p++) 919 end += sprintf(end, " %s", *p); 920 921 /* Start at unknown_options[1] to skip the initial space */ 922 pr_notice("Unknown kernel command line parameters \"%s\", will be passed to user space.\n", 923 &unknown_options[1]); 924 memblock_free(unknown_options, len); 925 } 926 927 asmlinkage __visible void __init __no_sanitize_address start_kernel(void) 928 { 929 char *command_line; 930 char *after_dashes; 931 932 set_task_stack_end_magic(&init_task); 933 smp_setup_processor_id(); 934 debug_objects_early_init(); 935 init_vmlinux_build_id(); 936 937 cgroup_init_early(); 938 939 local_irq_disable(); 940 early_boot_irqs_disabled = true; 941 942 /* 943 * Interrupts are still disabled. Do necessary setups, then 944 * enable them. 945 */ 946 boot_cpu_init(); 947 page_address_init(); 948 pr_notice("%s", linux_banner); 949 early_security_init(); 950 setup_arch(&command_line); 951 setup_boot_config(); 952 setup_command_line(command_line); 953 setup_nr_cpu_ids(); 954 setup_per_cpu_areas(); 955 smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ 956 boot_cpu_hotplug_init(); 957 958 build_all_zonelists(NULL); 959 page_alloc_init(); 960 961 pr_notice("Kernel command line: %s\n", saved_command_line); 962 /* parameters may set static keys */ 963 jump_label_init(); 964 parse_early_param(); 965 after_dashes = parse_args("Booting kernel", 966 static_command_line, __start___param, 967 __stop___param - __start___param, 968 -1, -1, NULL, &unknown_bootoption); 969 print_unknown_bootoptions(); 970 if (!IS_ERR_OR_NULL(after_dashes)) 971 parse_args("Setting init args", after_dashes, NULL, 0, -1, -1, 972 NULL, set_init_arg); 973 if (extra_init_args) 974 parse_args("Setting extra init args", extra_init_args, 975 NULL, 0, -1, -1, NULL, set_init_arg); 976 977 /* 978 * These use large bootmem allocations and must precede 979 * kmem_cache_init() 980 */ 981 setup_log_buf(0); 982 vfs_caches_init_early(); 983 sort_main_extable(); 984 trap_init(); 985 mm_init(); 986 987 ftrace_init(); 988 989 /* trace_printk can be enabled here */ 990 early_trace_init(); 991 992 /* 993 * Set up the scheduler prior starting any interrupts (such as the 994 * timer interrupt). Full topology setup happens at smp_init() 995 * time - but meanwhile we still have a functioning scheduler. 996 */ 997 sched_init(); 998 999 if (WARN(!irqs_disabled(), 1000 "Interrupts were enabled *very* early, fixing it\n")) 1001 local_irq_disable(); 1002 radix_tree_init(); 1003 1004 /* 1005 * Set up housekeeping before setting up workqueues to allow the unbound 1006 * workqueue to take non-housekeeping into account. 1007 */ 1008 housekeeping_init(); 1009 1010 /* 1011 * Allow workqueue creation and work item queueing/cancelling 1012 * early. Work item execution depends on kthreads and starts after 1013 * workqueue_init(). 1014 */ 1015 workqueue_init_early(); 1016 1017 rcu_init(); 1018 1019 /* Trace events are available after this */ 1020 trace_init(); 1021 1022 if (initcall_debug) 1023 initcall_debug_enable(); 1024 1025 context_tracking_init(); 1026 /* init some links before init_ISA_irqs() */ 1027 early_irq_init(); 1028 init_IRQ(); 1029 tick_init(); 1030 rcu_init_nohz(); 1031 init_timers(); 1032 srcu_init(); 1033 hrtimers_init(); 1034 softirq_init(); 1035 timekeeping_init(); 1036 kfence_init(); 1037 1038 /* 1039 * For best initial stack canary entropy, prepare it after: 1040 * - setup_arch() for any UEFI RNG entropy and boot cmdline access 1041 * - timekeeping_init() for ktime entropy used in rand_initialize() 1042 * - rand_initialize() to get any arch-specific entropy like RDRAND 1043 * - add_latent_entropy() to get any latent entropy 1044 * - adding command line entropy 1045 */ 1046 rand_initialize(); 1047 add_latent_entropy(); 1048 add_device_randomness(command_line, strlen(command_line)); 1049 boot_init_stack_canary(); 1050 1051 time_init(); 1052 perf_event_init(); 1053 profile_init(); 1054 call_function_init(); 1055 WARN(!irqs_disabled(), "Interrupts were enabled early\n"); 1056 1057 early_boot_irqs_disabled = false; 1058 local_irq_enable(); 1059 1060 kmem_cache_init_late(); 1061 1062 /* 1063 * HACK ALERT! This is early. We're enabling the console before 1064 * we've done PCI setups etc, and console_init() must be aware of 1065 * this. But we do want output early, in case something goes wrong. 1066 */ 1067 console_init(); 1068 if (panic_later) 1069 panic("Too many boot %s vars at `%s'", panic_later, 1070 panic_param); 1071 1072 lockdep_init(); 1073 1074 /* 1075 * Need to run this when irqs are enabled, because it wants 1076 * to self-test [hard/soft]-irqs on/off lock inversion bugs 1077 * too: 1078 */ 1079 locking_selftest(); 1080 1081 /* 1082 * This needs to be called before any devices perform DMA 1083 * operations that might use the SWIOTLB bounce buffers. It will 1084 * mark the bounce buffers as decrypted so that their usage will 1085 * not cause "plain-text" data to be decrypted when accessed. 1086 */ 1087 mem_encrypt_init(); 1088 1089 #ifdef CONFIG_BLK_DEV_INITRD 1090 if (initrd_start && !initrd_below_start_ok && 1091 page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) { 1092 pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n", 1093 page_to_pfn(virt_to_page((void *)initrd_start)), 1094 min_low_pfn); 1095 initrd_start = 0; 1096 } 1097 #endif 1098 setup_per_cpu_pageset(); 1099 numa_policy_init(); 1100 acpi_early_init(); 1101 if (late_time_init) 1102 late_time_init(); 1103 sched_clock_init(); 1104 calibrate_delay(); 1105 pid_idr_init(); 1106 anon_vma_init(); 1107 #ifdef CONFIG_X86 1108 if (efi_enabled(EFI_RUNTIME_SERVICES)) 1109 efi_enter_virtual_mode(); 1110 #endif 1111 thread_stack_cache_init(); 1112 cred_init(); 1113 fork_init(); 1114 proc_caches_init(); 1115 uts_ns_init(); 1116 key_init(); 1117 security_init(); 1118 dbg_late_init(); 1119 vfs_caches_init(); 1120 pagecache_init(); 1121 signals_init(); 1122 seq_file_init(); 1123 proc_root_init(); 1124 nsfs_init(); 1125 cpuset_init(); 1126 cgroup_init(); 1127 taskstats_init_early(); 1128 delayacct_init(); 1129 1130 poking_init(); 1131 check_bugs(); 1132 1133 acpi_subsystem_init(); 1134 arch_post_acpi_subsys_init(); 1135 kcsan_init(); 1136 1137 /* Do the rest non-__init'ed, we're now alive */ 1138 arch_call_rest_init(); 1139 1140 prevent_tail_call_optimization(); 1141 } 1142 1143 /* Call all constructor functions linked into the kernel. */ 1144 static void __init do_ctors(void) 1145 { 1146 /* 1147 * For UML, the constructors have already been called by the 1148 * normal setup code as it's just a normal ELF binary, so we 1149 * cannot do it again - but we do need CONFIG_CONSTRUCTORS 1150 * even on UML for modules. 1151 */ 1152 #if defined(CONFIG_CONSTRUCTORS) && !defined(CONFIG_UML) 1153 ctor_fn_t *fn = (ctor_fn_t *) __ctors_start; 1154 1155 for (; fn < (ctor_fn_t *) __ctors_end; fn++) 1156 (*fn)(); 1157 #endif 1158 } 1159 1160 #ifdef CONFIG_KALLSYMS 1161 struct blacklist_entry { 1162 struct list_head next; 1163 char *buf; 1164 }; 1165 1166 static __initdata_or_module LIST_HEAD(blacklisted_initcalls); 1167 1168 static int __init initcall_blacklist(char *str) 1169 { 1170 char *str_entry; 1171 struct blacklist_entry *entry; 1172 1173 /* str argument is a comma-separated list of functions */ 1174 do { 1175 str_entry = strsep(&str, ","); 1176 if (str_entry) { 1177 pr_debug("blacklisting initcall %s\n", str_entry); 1178 entry = memblock_alloc(sizeof(*entry), 1179 SMP_CACHE_BYTES); 1180 if (!entry) 1181 panic("%s: Failed to allocate %zu bytes\n", 1182 __func__, sizeof(*entry)); 1183 entry->buf = memblock_alloc(strlen(str_entry) + 1, 1184 SMP_CACHE_BYTES); 1185 if (!entry->buf) 1186 panic("%s: Failed to allocate %zu bytes\n", 1187 __func__, strlen(str_entry) + 1); 1188 strcpy(entry->buf, str_entry); 1189 list_add(&entry->next, &blacklisted_initcalls); 1190 } 1191 } while (str_entry); 1192 1193 return 0; 1194 } 1195 1196 static bool __init_or_module initcall_blacklisted(initcall_t fn) 1197 { 1198 struct blacklist_entry *entry; 1199 char fn_name[KSYM_SYMBOL_LEN]; 1200 unsigned long addr; 1201 1202 if (list_empty(&blacklisted_initcalls)) 1203 return false; 1204 1205 addr = (unsigned long) dereference_function_descriptor(fn); 1206 sprint_symbol_no_offset(fn_name, addr); 1207 1208 /* 1209 * fn will be "function_name [module_name]" where [module_name] is not 1210 * displayed for built-in init functions. Strip off the [module_name]. 1211 */ 1212 strreplace(fn_name, ' ', '\0'); 1213 1214 list_for_each_entry(entry, &blacklisted_initcalls, next) { 1215 if (!strcmp(fn_name, entry->buf)) { 1216 pr_debug("initcall %s blacklisted\n", fn_name); 1217 return true; 1218 } 1219 } 1220 1221 return false; 1222 } 1223 #else 1224 static int __init initcall_blacklist(char *str) 1225 { 1226 pr_warn("initcall_blacklist requires CONFIG_KALLSYMS\n"); 1227 return 0; 1228 } 1229 1230 static bool __init_or_module initcall_blacklisted(initcall_t fn) 1231 { 1232 return false; 1233 } 1234 #endif 1235 __setup("initcall_blacklist=", initcall_blacklist); 1236 1237 static __init_or_module void 1238 trace_initcall_start_cb(void *data, initcall_t fn) 1239 { 1240 ktime_t *calltime = (ktime_t *)data; 1241 1242 printk(KERN_DEBUG "calling %pS @ %i\n", fn, task_pid_nr(current)); 1243 *calltime = ktime_get(); 1244 } 1245 1246 static __init_or_module void 1247 trace_initcall_finish_cb(void *data, initcall_t fn, int ret) 1248 { 1249 ktime_t *calltime = (ktime_t *)data; 1250 ktime_t delta, rettime; 1251 unsigned long long duration; 1252 1253 rettime = ktime_get(); 1254 delta = ktime_sub(rettime, *calltime); 1255 duration = (unsigned long long) ktime_to_ns(delta) >> 10; 1256 printk(KERN_DEBUG "initcall %pS returned %d after %lld usecs\n", 1257 fn, ret, duration); 1258 } 1259 1260 static ktime_t initcall_calltime; 1261 1262 #ifdef TRACEPOINTS_ENABLED 1263 static void __init initcall_debug_enable(void) 1264 { 1265 int ret; 1266 1267 ret = register_trace_initcall_start(trace_initcall_start_cb, 1268 &initcall_calltime); 1269 ret |= register_trace_initcall_finish(trace_initcall_finish_cb, 1270 &initcall_calltime); 1271 WARN(ret, "Failed to register initcall tracepoints\n"); 1272 } 1273 # define do_trace_initcall_start trace_initcall_start 1274 # define do_trace_initcall_finish trace_initcall_finish 1275 #else 1276 static inline void do_trace_initcall_start(initcall_t fn) 1277 { 1278 if (!initcall_debug) 1279 return; 1280 trace_initcall_start_cb(&initcall_calltime, fn); 1281 } 1282 static inline void do_trace_initcall_finish(initcall_t fn, int ret) 1283 { 1284 if (!initcall_debug) 1285 return; 1286 trace_initcall_finish_cb(&initcall_calltime, fn, ret); 1287 } 1288 #endif /* !TRACEPOINTS_ENABLED */ 1289 1290 int __init_or_module do_one_initcall(initcall_t fn) 1291 { 1292 int count = preempt_count(); 1293 char msgbuf[64]; 1294 int ret; 1295 1296 if (initcall_blacklisted(fn)) 1297 return -EPERM; 1298 1299 do_trace_initcall_start(fn); 1300 ret = fn(); 1301 do_trace_initcall_finish(fn, ret); 1302 1303 msgbuf[0] = 0; 1304 1305 if (preempt_count() != count) { 1306 sprintf(msgbuf, "preemption imbalance "); 1307 preempt_count_set(count); 1308 } 1309 if (irqs_disabled()) { 1310 strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf)); 1311 local_irq_enable(); 1312 } 1313 WARN(msgbuf[0], "initcall %pS returned with %s\n", fn, msgbuf); 1314 1315 add_latent_entropy(); 1316 return ret; 1317 } 1318 1319 1320 extern initcall_entry_t __initcall_start[]; 1321 extern initcall_entry_t __initcall0_start[]; 1322 extern initcall_entry_t __initcall1_start[]; 1323 extern initcall_entry_t __initcall2_start[]; 1324 extern initcall_entry_t __initcall3_start[]; 1325 extern initcall_entry_t __initcall4_start[]; 1326 extern initcall_entry_t __initcall5_start[]; 1327 extern initcall_entry_t __initcall6_start[]; 1328 extern initcall_entry_t __initcall7_start[]; 1329 extern initcall_entry_t __initcall_end[]; 1330 1331 static initcall_entry_t *initcall_levels[] __initdata = { 1332 __initcall0_start, 1333 __initcall1_start, 1334 __initcall2_start, 1335 __initcall3_start, 1336 __initcall4_start, 1337 __initcall5_start, 1338 __initcall6_start, 1339 __initcall7_start, 1340 __initcall_end, 1341 }; 1342 1343 /* Keep these in sync with initcalls in include/linux/init.h */ 1344 static const char *initcall_level_names[] __initdata = { 1345 "pure", 1346 "core", 1347 "postcore", 1348 "arch", 1349 "subsys", 1350 "fs", 1351 "device", 1352 "late", 1353 }; 1354 1355 static int __init ignore_unknown_bootoption(char *param, char *val, 1356 const char *unused, void *arg) 1357 { 1358 return 0; 1359 } 1360 1361 static void __init do_initcall_level(int level, char *command_line) 1362 { 1363 initcall_entry_t *fn; 1364 1365 parse_args(initcall_level_names[level], 1366 command_line, __start___param, 1367 __stop___param - __start___param, 1368 level, level, 1369 NULL, ignore_unknown_bootoption); 1370 1371 trace_initcall_level(initcall_level_names[level]); 1372 for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++) 1373 do_one_initcall(initcall_from_entry(fn)); 1374 } 1375 1376 static void __init do_initcalls(void) 1377 { 1378 int level; 1379 size_t len = strlen(saved_command_line) + 1; 1380 char *command_line; 1381 1382 command_line = kzalloc(len, GFP_KERNEL); 1383 if (!command_line) 1384 panic("%s: Failed to allocate %zu bytes\n", __func__, len); 1385 1386 for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) { 1387 /* Parser modifies command_line, restore it each time */ 1388 strcpy(command_line, saved_command_line); 1389 do_initcall_level(level, command_line); 1390 } 1391 1392 kfree(command_line); 1393 } 1394 1395 /* 1396 * Ok, the machine is now initialized. None of the devices 1397 * have been touched yet, but the CPU subsystem is up and 1398 * running, and memory and process management works. 1399 * 1400 * Now we can finally start doing some real work.. 1401 */ 1402 static void __init do_basic_setup(void) 1403 { 1404 cpuset_init_smp(); 1405 driver_init(); 1406 init_irq_proc(); 1407 do_ctors(); 1408 do_initcalls(); 1409 } 1410 1411 static void __init do_pre_smp_initcalls(void) 1412 { 1413 initcall_entry_t *fn; 1414 1415 trace_initcall_level("early"); 1416 for (fn = __initcall_start; fn < __initcall0_start; fn++) 1417 do_one_initcall(initcall_from_entry(fn)); 1418 } 1419 1420 static int run_init_process(const char *init_filename) 1421 { 1422 const char *const *p; 1423 1424 argv_init[0] = init_filename; 1425 pr_info("Run %s as init process\n", init_filename); 1426 pr_debug(" with arguments:\n"); 1427 for (p = argv_init; *p; p++) 1428 pr_debug(" %s\n", *p); 1429 pr_debug(" with environment:\n"); 1430 for (p = envp_init; *p; p++) 1431 pr_debug(" %s\n", *p); 1432 return kernel_execve(init_filename, argv_init, envp_init); 1433 } 1434 1435 static int try_to_run_init_process(const char *init_filename) 1436 { 1437 int ret; 1438 1439 ret = run_init_process(init_filename); 1440 1441 if (ret && ret != -ENOENT) { 1442 pr_err("Starting init: %s exists but couldn't execute it (error %d)\n", 1443 init_filename, ret); 1444 } 1445 1446 return ret; 1447 } 1448 1449 static noinline void __init kernel_init_freeable(void); 1450 1451 #if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX) 1452 bool rodata_enabled __ro_after_init = true; 1453 static int __init set_debug_rodata(char *str) 1454 { 1455 return strtobool(str, &rodata_enabled); 1456 } 1457 __setup("rodata=", set_debug_rodata); 1458 #endif 1459 1460 #ifdef CONFIG_STRICT_KERNEL_RWX 1461 static void mark_readonly(void) 1462 { 1463 if (rodata_enabled) { 1464 /* 1465 * load_module() results in W+X mappings, which are cleaned 1466 * up with call_rcu(). Let's make sure that queued work is 1467 * flushed so that we don't hit false positives looking for 1468 * insecure pages which are W+X. 1469 */ 1470 rcu_barrier(); 1471 mark_rodata_ro(); 1472 rodata_test(); 1473 } else 1474 pr_info("Kernel memory protection disabled.\n"); 1475 } 1476 #elif defined(CONFIG_ARCH_HAS_STRICT_KERNEL_RWX) 1477 static inline void mark_readonly(void) 1478 { 1479 pr_warn("Kernel memory protection not selected by kernel config.\n"); 1480 } 1481 #else 1482 static inline void mark_readonly(void) 1483 { 1484 pr_warn("This architecture does not have kernel memory protection.\n"); 1485 } 1486 #endif 1487 1488 void __weak free_initmem(void) 1489 { 1490 free_initmem_default(POISON_FREE_INITMEM); 1491 } 1492 1493 static int __ref kernel_init(void *unused) 1494 { 1495 int ret; 1496 1497 /* 1498 * Wait until kthreadd is all set-up. 1499 */ 1500 wait_for_completion(&kthreadd_done); 1501 1502 kernel_init_freeable(); 1503 /* need to finish all async __init code before freeing the memory */ 1504 async_synchronize_full(); 1505 1506 system_state = SYSTEM_FREEING_INITMEM; 1507 kprobe_free_init_mem(); 1508 ftrace_free_init_mem(); 1509 kgdb_free_init_mem(); 1510 exit_boot_config(); 1511 free_initmem(); 1512 mark_readonly(); 1513 1514 /* 1515 * Kernel mappings are now finalized - update the userspace page-table 1516 * to finalize PTI. 1517 */ 1518 pti_finalize(); 1519 1520 system_state = SYSTEM_RUNNING; 1521 numa_default_policy(); 1522 1523 rcu_end_inkernel_boot(); 1524 1525 do_sysctl_args(); 1526 1527 if (ramdisk_execute_command) { 1528 ret = run_init_process(ramdisk_execute_command); 1529 if (!ret) 1530 return 0; 1531 pr_err("Failed to execute %s (error %d)\n", 1532 ramdisk_execute_command, ret); 1533 } 1534 1535 /* 1536 * We try each of these until one succeeds. 1537 * 1538 * The Bourne shell can be used instead of init if we are 1539 * trying to recover a really broken machine. 1540 */ 1541 if (execute_command) { 1542 ret = run_init_process(execute_command); 1543 if (!ret) 1544 return 0; 1545 panic("Requested init %s failed (error %d).", 1546 execute_command, ret); 1547 } 1548 1549 if (CONFIG_DEFAULT_INIT[0] != '\0') { 1550 ret = run_init_process(CONFIG_DEFAULT_INIT); 1551 if (ret) 1552 pr_err("Default init %s failed (error %d)\n", 1553 CONFIG_DEFAULT_INIT, ret); 1554 else 1555 return 0; 1556 } 1557 1558 if (!try_to_run_init_process("/sbin/init") || 1559 !try_to_run_init_process("/etc/init") || 1560 !try_to_run_init_process("/bin/init") || 1561 !try_to_run_init_process("/bin/sh")) 1562 return 0; 1563 1564 panic("No working init found. Try passing init= option to kernel. " 1565 "See Linux Documentation/admin-guide/init.rst for guidance."); 1566 } 1567 1568 /* Open /dev/console, for stdin/stdout/stderr, this should never fail */ 1569 void __init console_on_rootfs(void) 1570 { 1571 struct file *file = filp_open("/dev/console", O_RDWR, 0); 1572 1573 if (IS_ERR(file)) { 1574 pr_err("Warning: unable to open an initial console.\n"); 1575 return; 1576 } 1577 init_dup(file); 1578 init_dup(file); 1579 init_dup(file); 1580 fput(file); 1581 } 1582 1583 static noinline void __init kernel_init_freeable(void) 1584 { 1585 /* Now the scheduler is fully set up and can do blocking allocations */ 1586 gfp_allowed_mask = __GFP_BITS_MASK; 1587 1588 /* 1589 * init can allocate pages on any node 1590 */ 1591 set_mems_allowed(node_states[N_MEMORY]); 1592 1593 cad_pid = get_pid(task_pid(current)); 1594 1595 smp_prepare_cpus(setup_max_cpus); 1596 1597 workqueue_init(); 1598 1599 init_mm_internals(); 1600 1601 rcu_init_tasks_generic(); 1602 do_pre_smp_initcalls(); 1603 lockup_detector_init(); 1604 1605 smp_init(); 1606 sched_init_smp(); 1607 1608 padata_init(); 1609 page_alloc_init_late(); 1610 /* Initialize page ext after all struct pages are initialized. */ 1611 page_ext_init(); 1612 1613 do_basic_setup(); 1614 1615 kunit_run_all_tests(); 1616 1617 wait_for_initramfs(); 1618 console_on_rootfs(); 1619 1620 /* 1621 * check if there is an early userspace init. If yes, let it do all 1622 * the work 1623 */ 1624 if (init_eaccess(ramdisk_execute_command) != 0) { 1625 ramdisk_execute_command = NULL; 1626 prepare_namespace(); 1627 } 1628 1629 /* 1630 * Ok, we have completed the initial bootup, and 1631 * we're essentially up and running. Get rid of the 1632 * initmem segments and start the user-mode stuff.. 1633 * 1634 * rootfs is available now, try loading the public keys 1635 * and default modules 1636 */ 1637 1638 integrity_load_keys(); 1639 } 1640