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/kmsan.h> 38 #include <linux/vmalloc.h> 39 #include <linux/kernel_stat.h> 40 #include <linux/start_kernel.h> 41 #include <linux/security.h> 42 #include <linux/smp.h> 43 #include <linux/profile.h> 44 #include <linux/kfence.h> 45 #include <linux/rcupdate.h> 46 #include <linux/srcu.h> 47 #include <linux/moduleparam.h> 48 #include <linux/kallsyms.h> 49 #include <linux/buildid.h> 50 #include <linux/writeback.h> 51 #include <linux/cpu.h> 52 #include <linux/cpuset.h> 53 #include <linux/cgroup.h> 54 #include <linux/efi.h> 55 #include <linux/tick.h> 56 #include <linux/sched/isolation.h> 57 #include <linux/interrupt.h> 58 #include <linux/taskstats_kern.h> 59 #include <linux/delayacct.h> 60 #include <linux/unistd.h> 61 #include <linux/utsname.h> 62 #include <linux/rmap.h> 63 #include <linux/mempolicy.h> 64 #include <linux/key.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/moduleloader.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/kcsan.h> 100 #include <linux/init_syscalls.h> 101 #include <linux/stackdepot.h> 102 #include <linux/randomize_kstack.h> 103 #include <linux/pidfs.h> 104 #include <linux/ptdump.h> 105 #include <net/net_namespace.h> 106 107 #include <asm/io.h> 108 #include <asm/setup.h> 109 #include <asm/sections.h> 110 #include <asm/cacheflush.h> 111 112 #define CREATE_TRACE_POINTS 113 #include <trace/events/initcall.h> 114 115 #include <kunit/test.h> 116 117 static int kernel_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 /* Default late time init is NULL. archs can override this later. */ 138 void (*__initdata late_time_init)(void); 139 140 /* Untouched command line saved by arch-specific code. */ 141 char __initdata boot_command_line[COMMAND_LINE_SIZE]; 142 /* Untouched saved command line (eg. for /proc) */ 143 char *saved_command_line __ro_after_init; 144 unsigned int saved_command_line_len __ro_after_init; 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 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(size_t *_size) 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 if (xbc_calc_checksum(data, size) != csum) { 301 pr_err("bootconfig checksum failed\n"); 302 return NULL; 303 } 304 305 /* Remove bootconfig from initramfs/initrd */ 306 initrd_end = (unsigned long)data; 307 if (_size) 308 *_size = size; 309 310 return data; 311 } 312 #else 313 static void * __init get_boot_config_from_initrd(size_t *_size) 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 memblock_free(new_cmdline, len + 1); 386 return NULL; 387 } 388 389 return new_cmdline; 390 } 391 392 static int __init bootconfig_params(char *param, char *val, 393 const char *unused, void *arg) 394 { 395 if (strcmp(param, "bootconfig") == 0) { 396 bootconfig_found = true; 397 } 398 return 0; 399 } 400 401 static int __init warn_bootconfig(char *str) 402 { 403 /* The 'bootconfig' has been handled by bootconfig_params(). */ 404 return 0; 405 } 406 407 static void __init setup_boot_config(void) 408 { 409 static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata; 410 const char *msg, *data; 411 int pos, ret; 412 size_t size; 413 char *err; 414 415 /* Cut out the bootconfig data even if we have no bootconfig option */ 416 data = get_boot_config_from_initrd(&size); 417 /* If there is no bootconfig in initrd, try embedded one. */ 418 if (!data) 419 data = xbc_get_embedded_bootconfig(&size); 420 421 strscpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); 422 err = parse_args("bootconfig", tmp_cmdline, NULL, 0, 0, 0, NULL, 423 bootconfig_params); 424 425 if (IS_ERR(err) || !(bootconfig_found || IS_ENABLED(CONFIG_BOOT_CONFIG_FORCE))) 426 return; 427 428 /* parse_args() stops at the next param of '--' and returns an address */ 429 if (err) 430 initargs_offs = err - tmp_cmdline; 431 432 if (!data) { 433 /* If user intended to use bootconfig, show an error level message */ 434 if (bootconfig_found) 435 pr_err("'bootconfig' found on command line, but no bootconfig found\n"); 436 else 437 pr_info("No bootconfig data provided, so skipping bootconfig"); 438 return; 439 } 440 441 if (size >= XBC_DATA_MAX) { 442 pr_err("bootconfig size %ld greater than max size %d\n", 443 (long)size, XBC_DATA_MAX); 444 return; 445 } 446 447 ret = xbc_init(data, size, &msg, &pos); 448 if (ret < 0) { 449 if (pos < 0) 450 pr_err("Failed to init bootconfig: %s.\n", msg); 451 else 452 pr_err("Failed to parse bootconfig: %s at %d.\n", 453 msg, pos); 454 } else { 455 xbc_get_info(&ret, NULL); 456 pr_info("Load bootconfig: %ld bytes %d nodes\n", (long)size, ret); 457 /* keys starting with "kernel." are passed via cmdline */ 458 extra_command_line = xbc_make_cmdline("kernel"); 459 /* Also, "init." keys are init arguments */ 460 extra_init_args = xbc_make_cmdline("init"); 461 } 462 return; 463 } 464 465 static void __init exit_boot_config(void) 466 { 467 xbc_exit(); 468 } 469 470 #else /* !CONFIG_BOOT_CONFIG */ 471 472 static void __init setup_boot_config(void) 473 { 474 /* Remove bootconfig data from initrd */ 475 get_boot_config_from_initrd(NULL); 476 } 477 478 static int __init warn_bootconfig(char *str) 479 { 480 pr_warn("WARNING: 'bootconfig' found on the kernel command line but CONFIG_BOOT_CONFIG is not set.\n"); 481 return 0; 482 } 483 484 #define exit_boot_config() do {} while (0) 485 486 #endif /* CONFIG_BOOT_CONFIG */ 487 488 early_param("bootconfig", warn_bootconfig); 489 490 /* Change NUL term back to "=", to make "param" the whole string. */ 491 static void __init repair_env_string(char *param, char *val) 492 { 493 if (val) { 494 /* param=val or param="val"? */ 495 if (val == param+strlen(param)+1) 496 val[-1] = '='; 497 else if (val == param+strlen(param)+2) { 498 val[-2] = '='; 499 memmove(val-1, val, strlen(val)+1); 500 } else 501 BUG(); 502 } 503 } 504 505 /* Anything after -- gets handed straight to init. */ 506 static int __init set_init_arg(char *param, char *val, 507 const char *unused, void *arg) 508 { 509 unsigned int i; 510 511 if (panic_later) 512 return 0; 513 514 repair_env_string(param, val); 515 516 for (i = 0; argv_init[i]; i++) { 517 if (i == MAX_INIT_ARGS) { 518 panic_later = "init"; 519 panic_param = param; 520 return 0; 521 } 522 } 523 argv_init[i] = param; 524 return 0; 525 } 526 527 /* 528 * Unknown boot options get handed to init, unless they look like 529 * unused parameters (modprobe will find them in /proc/cmdline). 530 */ 531 static int __init unknown_bootoption(char *param, char *val, 532 const char *unused, void *arg) 533 { 534 size_t len = strlen(param); 535 536 /* Handle params aliased to sysctls */ 537 if (sysctl_is_alias(param)) 538 return 0; 539 540 repair_env_string(param, val); 541 542 /* Handle obsolete-style parameters */ 543 if (obsolete_checksetup(param)) 544 return 0; 545 546 /* Unused module parameter. */ 547 if (strnchr(param, len, '.')) 548 return 0; 549 550 if (panic_later) 551 return 0; 552 553 if (val) { 554 /* Environment option */ 555 unsigned int i; 556 for (i = 0; envp_init[i]; i++) { 557 if (i == MAX_INIT_ENVS) { 558 panic_later = "env"; 559 panic_param = param; 560 } 561 if (!strncmp(param, envp_init[i], len+1)) 562 break; 563 } 564 envp_init[i] = param; 565 } else { 566 /* Command line option */ 567 unsigned int i; 568 for (i = 0; argv_init[i]; i++) { 569 if (i == MAX_INIT_ARGS) { 570 panic_later = "init"; 571 panic_param = param; 572 } 573 } 574 argv_init[i] = param; 575 } 576 return 0; 577 } 578 579 static int __init init_setup(char *str) 580 { 581 unsigned int i; 582 583 execute_command = str; 584 /* 585 * In case LILO is going to boot us with default command line, 586 * it prepends "auto" before the whole cmdline which makes 587 * the shell think it should execute a script with such name. 588 * So we ignore all arguments entered _before_ init=... [MJ] 589 */ 590 for (i = 1; i < MAX_INIT_ARGS; i++) 591 argv_init[i] = NULL; 592 return 1; 593 } 594 __setup("init=", init_setup); 595 596 static int __init rdinit_setup(char *str) 597 { 598 unsigned int i; 599 600 ramdisk_execute_command = str; 601 /* See "auto" comment in init_setup */ 602 for (i = 1; i < MAX_INIT_ARGS; i++) 603 argv_init[i] = NULL; 604 return 1; 605 } 606 __setup("rdinit=", rdinit_setup); 607 608 #ifndef CONFIG_SMP 609 static inline void setup_nr_cpu_ids(void) { } 610 static inline void smp_prepare_cpus(unsigned int maxcpus) { } 611 #endif 612 613 /* 614 * We need to store the untouched command line for future reference. 615 * We also need to store the touched command line since the parameter 616 * parsing is performed in place, and we should allow a component to 617 * store reference of name/value for future reference. 618 */ 619 static void __init setup_command_line(char *command_line) 620 { 621 size_t len, xlen = 0, ilen = 0; 622 623 if (extra_command_line) 624 xlen = strlen(extra_command_line); 625 if (extra_init_args) 626 ilen = strlen(extra_init_args) + 4; /* for " -- " */ 627 628 len = xlen + strlen(boot_command_line) + 1; 629 630 saved_command_line = memblock_alloc(len + ilen, SMP_CACHE_BYTES); 631 if (!saved_command_line) 632 panic("%s: Failed to allocate %zu bytes\n", __func__, len + ilen); 633 634 static_command_line = memblock_alloc(len, SMP_CACHE_BYTES); 635 if (!static_command_line) 636 panic("%s: Failed to allocate %zu bytes\n", __func__, len); 637 638 if (xlen) { 639 /* 640 * We have to put extra_command_line before boot command 641 * lines because there could be dashes (separator of init 642 * command line) in the command lines. 643 */ 644 strcpy(saved_command_line, extra_command_line); 645 strcpy(static_command_line, extra_command_line); 646 } 647 strcpy(saved_command_line + xlen, boot_command_line); 648 strcpy(static_command_line + xlen, command_line); 649 650 if (ilen) { 651 /* 652 * Append supplemental init boot args to saved_command_line 653 * so that user can check what command line options passed 654 * to init. 655 * The order should always be 656 * " -- "[bootconfig init-param][cmdline init-param] 657 */ 658 if (initargs_offs) { 659 len = xlen + initargs_offs; 660 strcpy(saved_command_line + len, extra_init_args); 661 len += ilen - 4; /* strlen(extra_init_args) */ 662 strcpy(saved_command_line + len, 663 boot_command_line + initargs_offs - 1); 664 } else { 665 len = strlen(saved_command_line); 666 strcpy(saved_command_line + len, " -- "); 667 len += 4; 668 strcpy(saved_command_line + len, extra_init_args); 669 } 670 } 671 672 saved_command_line_len = strlen(saved_command_line); 673 } 674 675 /* 676 * We need to finalize in a non-__init function or else race conditions 677 * between the root thread and the init thread may cause start_kernel to 678 * be reaped by free_initmem before the root thread has proceeded to 679 * cpu_idle. 680 * 681 * gcc-3.4 accidentally inlines this function, so use noinline. 682 */ 683 684 static __initdata DECLARE_COMPLETION(kthreadd_done); 685 686 static noinline void __ref __noreturn rest_init(void) 687 { 688 struct task_struct *tsk; 689 int pid; 690 691 rcu_scheduler_starting(); 692 /* 693 * We need to spawn init first so that it obtains pid 1, however 694 * the init task will end up wanting to create kthreads, which, if 695 * we schedule it before we create kthreadd, will OOPS. 696 */ 697 pid = user_mode_thread(kernel_init, NULL, CLONE_FS); 698 /* 699 * Pin init on the boot CPU. Task migration is not properly working 700 * until sched_init_smp() has been run. It will set the allowed 701 * CPUs for init to the non isolated CPUs. 702 */ 703 rcu_read_lock(); 704 tsk = find_task_by_pid_ns(pid, &init_pid_ns); 705 tsk->flags |= PF_NO_SETAFFINITY; 706 set_cpus_allowed_ptr(tsk, cpumask_of(smp_processor_id())); 707 rcu_read_unlock(); 708 709 numa_default_policy(); 710 pid = kernel_thread(kthreadd, NULL, NULL, CLONE_FS | CLONE_FILES); 711 rcu_read_lock(); 712 kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns); 713 rcu_read_unlock(); 714 715 /* 716 * Enable might_sleep() and smp_processor_id() checks. 717 * They cannot be enabled earlier because with CONFIG_PREEMPTION=y 718 * kernel_thread() would trigger might_sleep() splats. With 719 * CONFIG_PREEMPT_VOLUNTARY=y the init task might have scheduled 720 * already, but it's stuck on the kthreadd_done completion. 721 */ 722 system_state = SYSTEM_SCHEDULING; 723 724 complete(&kthreadd_done); 725 726 /* 727 * The boot idle thread must execute schedule() 728 * at least once to get things moving: 729 */ 730 schedule_preempt_disabled(); 731 /* Call into cpu_idle with preempt disabled */ 732 cpu_startup_entry(CPUHP_ONLINE); 733 } 734 735 /* Check for early params. */ 736 static int __init do_early_param(char *param, char *val, 737 const char *unused, void *arg) 738 { 739 const struct obs_kernel_param *p; 740 741 for (p = __setup_start; p < __setup_end; p++) { 742 if ((p->early && parameq(param, p->str)) || 743 (strcmp(param, "console") == 0 && 744 strcmp(p->str, "earlycon") == 0) 745 ) { 746 if (p->setup_func(val) != 0) 747 pr_warn("Malformed early option '%s'\n", param); 748 } 749 } 750 /* We accept everything at this stage. */ 751 return 0; 752 } 753 754 void __init parse_early_options(char *cmdline) 755 { 756 parse_args("early options", cmdline, NULL, 0, 0, 0, NULL, 757 do_early_param); 758 } 759 760 /* Arch code calls this early on, or if not, just before other parsing. */ 761 void __init parse_early_param(void) 762 { 763 static int done __initdata; 764 static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata; 765 766 if (done) 767 return; 768 769 /* All fall through to do_early_param. */ 770 strscpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); 771 parse_early_options(tmp_cmdline); 772 done = 1; 773 } 774 775 void __init __weak arch_post_acpi_subsys_init(void) { } 776 777 void __init __weak smp_setup_processor_id(void) 778 { 779 } 780 781 void __init __weak smp_prepare_boot_cpu(void) 782 { 783 } 784 785 # if THREAD_SIZE >= PAGE_SIZE 786 void __init __weak thread_stack_cache_init(void) 787 { 788 } 789 #endif 790 791 void __init __weak poking_init(void) { } 792 793 void __init __weak pgtable_cache_init(void) { } 794 795 void __init __weak trap_init(void) { } 796 797 bool initcall_debug; 798 core_param(initcall_debug, initcall_debug, bool, 0644); 799 800 #ifdef TRACEPOINTS_ENABLED 801 static void __init initcall_debug_enable(void); 802 #else 803 static inline void initcall_debug_enable(void) 804 { 805 } 806 #endif 807 808 #ifdef CONFIG_RANDOMIZE_KSTACK_OFFSET 809 DEFINE_STATIC_KEY_MAYBE_RO(CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT, 810 randomize_kstack_offset); 811 DEFINE_PER_CPU(u32, kstack_offset); 812 813 static int __init early_randomize_kstack_offset(char *buf) 814 { 815 int ret; 816 bool bool_result; 817 818 ret = kstrtobool(buf, &bool_result); 819 if (ret) 820 return ret; 821 822 if (bool_result) 823 static_branch_enable(&randomize_kstack_offset); 824 else 825 static_branch_disable(&randomize_kstack_offset); 826 return 0; 827 } 828 early_param("randomize_kstack_offset", early_randomize_kstack_offset); 829 #endif 830 831 static void __init print_unknown_bootoptions(void) 832 { 833 char *unknown_options; 834 char *end; 835 const char *const *p; 836 size_t len; 837 838 if (panic_later || (!argv_init[1] && !envp_init[2])) 839 return; 840 841 /* 842 * Determine how many options we have to print out, plus a space 843 * before each 844 */ 845 len = 1; /* null terminator */ 846 for (p = &argv_init[1]; *p; p++) { 847 len++; 848 len += strlen(*p); 849 } 850 for (p = &envp_init[2]; *p; p++) { 851 len++; 852 len += strlen(*p); 853 } 854 855 unknown_options = memblock_alloc(len, SMP_CACHE_BYTES); 856 if (!unknown_options) { 857 pr_err("%s: Failed to allocate %zu bytes\n", 858 __func__, len); 859 return; 860 } 861 end = unknown_options; 862 863 for (p = &argv_init[1]; *p; p++) 864 end += sprintf(end, " %s", *p); 865 for (p = &envp_init[2]; *p; p++) 866 end += sprintf(end, " %s", *p); 867 868 /* Start at unknown_options[1] to skip the initial space */ 869 pr_notice("Unknown kernel command line parameters \"%s\", will be passed to user space.\n", 870 &unknown_options[1]); 871 memblock_free(unknown_options, len); 872 } 873 874 asmlinkage __visible __init __no_sanitize_address __noreturn __no_stack_protector 875 void start_kernel(void) 876 { 877 char *command_line; 878 char *after_dashes; 879 880 set_task_stack_end_magic(&init_task); 881 smp_setup_processor_id(); 882 debug_objects_early_init(); 883 init_vmlinux_build_id(); 884 885 cgroup_init_early(); 886 887 local_irq_disable(); 888 early_boot_irqs_disabled = true; 889 890 /* 891 * Interrupts are still disabled. Do necessary setups, then 892 * enable them. 893 */ 894 boot_cpu_init(); 895 page_address_init(); 896 pr_notice("%s", linux_banner); 897 early_security_init(); 898 setup_arch(&command_line); 899 setup_boot_config(); 900 setup_command_line(command_line); 901 setup_nr_cpu_ids(); 902 setup_per_cpu_areas(); 903 smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ 904 boot_cpu_hotplug_init(); 905 906 pr_notice("Kernel command line: %s\n", saved_command_line); 907 /* parameters may set static keys */ 908 jump_label_init(); 909 parse_early_param(); 910 after_dashes = parse_args("Booting kernel", 911 static_command_line, __start___param, 912 __stop___param - __start___param, 913 -1, -1, NULL, &unknown_bootoption); 914 print_unknown_bootoptions(); 915 if (!IS_ERR_OR_NULL(after_dashes)) 916 parse_args("Setting init args", after_dashes, NULL, 0, -1, -1, 917 NULL, set_init_arg); 918 if (extra_init_args) 919 parse_args("Setting extra init args", extra_init_args, 920 NULL, 0, -1, -1, NULL, set_init_arg); 921 922 /* Architectural and non-timekeeping rng init, before allocator init */ 923 random_init_early(command_line); 924 925 /* 926 * These use large bootmem allocations and must precede 927 * initalization of page allocator 928 */ 929 setup_log_buf(0); 930 vfs_caches_init_early(); 931 sort_main_extable(); 932 trap_init(); 933 mm_core_init(); 934 poking_init(); 935 ftrace_init(); 936 937 /* trace_printk can be enabled here */ 938 early_trace_init(); 939 940 /* 941 * Set up the scheduler prior starting any interrupts (such as the 942 * timer interrupt). Full topology setup happens at smp_init() 943 * time - but meanwhile we still have a functioning scheduler. 944 */ 945 sched_init(); 946 947 if (WARN(!irqs_disabled(), 948 "Interrupts were enabled *very* early, fixing it\n")) 949 local_irq_disable(); 950 radix_tree_init(); 951 maple_tree_init(); 952 953 /* 954 * Set up housekeeping before setting up workqueues to allow the unbound 955 * workqueue to take non-housekeeping into account. 956 */ 957 housekeeping_init(); 958 959 /* 960 * Allow workqueue creation and work item queueing/cancelling 961 * early. Work item execution depends on kthreads and starts after 962 * workqueue_init(). 963 */ 964 workqueue_init_early(); 965 966 rcu_init(); 967 968 /* Trace events are available after this */ 969 trace_init(); 970 971 if (initcall_debug) 972 initcall_debug_enable(); 973 974 context_tracking_init(); 975 /* init some links before init_ISA_irqs() */ 976 early_irq_init(); 977 init_IRQ(); 978 tick_init(); 979 rcu_init_nohz(); 980 init_timers(); 981 srcu_init(); 982 hrtimers_init(); 983 softirq_init(); 984 timekeeping_init(); 985 time_init(); 986 987 /* This must be after timekeeping is initialized */ 988 random_init(); 989 990 /* These make use of the fully initialized rng */ 991 kfence_init(); 992 boot_init_stack_canary(); 993 994 perf_event_init(); 995 profile_init(); 996 call_function_init(); 997 WARN(!irqs_disabled(), "Interrupts were enabled early\n"); 998 999 early_boot_irqs_disabled = false; 1000 local_irq_enable(); 1001 1002 kmem_cache_init_late(); 1003 1004 /* 1005 * HACK ALERT! This is early. We're enabling the console before 1006 * we've done PCI setups etc, and console_init() must be aware of 1007 * this. But we do want output early, in case something goes wrong. 1008 */ 1009 console_init(); 1010 if (panic_later) 1011 panic("Too many boot %s vars at `%s'", panic_later, 1012 panic_param); 1013 1014 lockdep_init(); 1015 1016 /* 1017 * Need to run this when irqs are enabled, because it wants 1018 * to self-test [hard/soft]-irqs on/off lock inversion bugs 1019 * too: 1020 */ 1021 locking_selftest(); 1022 1023 #ifdef CONFIG_BLK_DEV_INITRD 1024 if (initrd_start && !initrd_below_start_ok && 1025 page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) { 1026 pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n", 1027 page_to_pfn(virt_to_page((void *)initrd_start)), 1028 min_low_pfn); 1029 initrd_start = 0; 1030 } 1031 #endif 1032 setup_per_cpu_pageset(); 1033 numa_policy_init(); 1034 acpi_early_init(); 1035 if (late_time_init) 1036 late_time_init(); 1037 sched_clock_init(); 1038 calibrate_delay(); 1039 1040 arch_cpu_finalize_init(); 1041 1042 pid_idr_init(); 1043 anon_vma_init(); 1044 #ifdef CONFIG_X86 1045 if (efi_enabled(EFI_RUNTIME_SERVICES)) 1046 efi_enter_virtual_mode(); 1047 #endif 1048 thread_stack_cache_init(); 1049 cred_init(); 1050 fork_init(); 1051 proc_caches_init(); 1052 uts_ns_init(); 1053 key_init(); 1054 security_init(); 1055 dbg_late_init(); 1056 net_ns_init(); 1057 vfs_caches_init(); 1058 pagecache_init(); 1059 signals_init(); 1060 seq_file_init(); 1061 proc_root_init(); 1062 nsfs_init(); 1063 pidfs_init(); 1064 cpuset_init(); 1065 cgroup_init(); 1066 taskstats_init_early(); 1067 delayacct_init(); 1068 1069 acpi_subsystem_init(); 1070 arch_post_acpi_subsys_init(); 1071 kcsan_init(); 1072 1073 /* Do the rest non-__init'ed, we're now alive */ 1074 rest_init(); 1075 1076 /* 1077 * Avoid stack canaries in callers of boot_init_stack_canary for gcc-10 1078 * and older. 1079 */ 1080 #if !__has_attribute(__no_stack_protector__) 1081 prevent_tail_call_optimization(); 1082 #endif 1083 } 1084 1085 /* Call all constructor functions linked into the kernel. */ 1086 static void __init do_ctors(void) 1087 { 1088 /* 1089 * For UML, the constructors have already been called by the 1090 * normal setup code as it's just a normal ELF binary, so we 1091 * cannot do it again - but we do need CONFIG_CONSTRUCTORS 1092 * even on UML for modules. 1093 */ 1094 #if defined(CONFIG_CONSTRUCTORS) && !defined(CONFIG_UML) 1095 ctor_fn_t *fn = (ctor_fn_t *) __ctors_start; 1096 1097 for (; fn < (ctor_fn_t *) __ctors_end; fn++) 1098 (*fn)(); 1099 #endif 1100 } 1101 1102 #ifdef CONFIG_KALLSYMS 1103 struct blacklist_entry { 1104 struct list_head next; 1105 char *buf; 1106 }; 1107 1108 static __initdata_or_module LIST_HEAD(blacklisted_initcalls); 1109 1110 static int __init initcall_blacklist(char *str) 1111 { 1112 char *str_entry; 1113 struct blacklist_entry *entry; 1114 1115 /* str argument is a comma-separated list of functions */ 1116 do { 1117 str_entry = strsep(&str, ","); 1118 if (str_entry) { 1119 pr_debug("blacklisting initcall %s\n", str_entry); 1120 entry = memblock_alloc(sizeof(*entry), 1121 SMP_CACHE_BYTES); 1122 if (!entry) 1123 panic("%s: Failed to allocate %zu bytes\n", 1124 __func__, sizeof(*entry)); 1125 entry->buf = memblock_alloc(strlen(str_entry) + 1, 1126 SMP_CACHE_BYTES); 1127 if (!entry->buf) 1128 panic("%s: Failed to allocate %zu bytes\n", 1129 __func__, strlen(str_entry) + 1); 1130 strcpy(entry->buf, str_entry); 1131 list_add(&entry->next, &blacklisted_initcalls); 1132 } 1133 } while (str_entry); 1134 1135 return 1; 1136 } 1137 1138 static bool __init_or_module initcall_blacklisted(initcall_t fn) 1139 { 1140 struct blacklist_entry *entry; 1141 char fn_name[KSYM_SYMBOL_LEN]; 1142 unsigned long addr; 1143 1144 if (list_empty(&blacklisted_initcalls)) 1145 return false; 1146 1147 addr = (unsigned long) dereference_function_descriptor(fn); 1148 sprint_symbol_no_offset(fn_name, addr); 1149 1150 /* 1151 * fn will be "function_name [module_name]" where [module_name] is not 1152 * displayed for built-in init functions. Strip off the [module_name]. 1153 */ 1154 strreplace(fn_name, ' ', '\0'); 1155 1156 list_for_each_entry(entry, &blacklisted_initcalls, next) { 1157 if (!strcmp(fn_name, entry->buf)) { 1158 pr_debug("initcall %s blacklisted\n", fn_name); 1159 return true; 1160 } 1161 } 1162 1163 return false; 1164 } 1165 #else 1166 static int __init initcall_blacklist(char *str) 1167 { 1168 pr_warn("initcall_blacklist requires CONFIG_KALLSYMS\n"); 1169 return 0; 1170 } 1171 1172 static bool __init_or_module initcall_blacklisted(initcall_t fn) 1173 { 1174 return false; 1175 } 1176 #endif 1177 __setup("initcall_blacklist=", initcall_blacklist); 1178 1179 static __init_or_module void 1180 trace_initcall_start_cb(void *data, initcall_t fn) 1181 { 1182 ktime_t *calltime = data; 1183 1184 printk(KERN_DEBUG "calling %pS @ %i\n", fn, task_pid_nr(current)); 1185 *calltime = ktime_get(); 1186 } 1187 1188 static __init_or_module void 1189 trace_initcall_finish_cb(void *data, initcall_t fn, int ret) 1190 { 1191 ktime_t rettime, *calltime = data; 1192 1193 rettime = ktime_get(); 1194 printk(KERN_DEBUG "initcall %pS returned %d after %lld usecs\n", 1195 fn, ret, (unsigned long long)ktime_us_delta(rettime, *calltime)); 1196 } 1197 1198 static ktime_t initcall_calltime; 1199 1200 #ifdef TRACEPOINTS_ENABLED 1201 static void __init initcall_debug_enable(void) 1202 { 1203 int ret; 1204 1205 ret = register_trace_initcall_start(trace_initcall_start_cb, 1206 &initcall_calltime); 1207 ret |= register_trace_initcall_finish(trace_initcall_finish_cb, 1208 &initcall_calltime); 1209 WARN(ret, "Failed to register initcall tracepoints\n"); 1210 } 1211 # define do_trace_initcall_start trace_initcall_start 1212 # define do_trace_initcall_finish trace_initcall_finish 1213 #else 1214 static inline void do_trace_initcall_start(initcall_t fn) 1215 { 1216 if (!initcall_debug) 1217 return; 1218 trace_initcall_start_cb(&initcall_calltime, fn); 1219 } 1220 static inline void do_trace_initcall_finish(initcall_t fn, int ret) 1221 { 1222 if (!initcall_debug) 1223 return; 1224 trace_initcall_finish_cb(&initcall_calltime, fn, ret); 1225 } 1226 #endif /* !TRACEPOINTS_ENABLED */ 1227 1228 int __init_or_module do_one_initcall(initcall_t fn) 1229 { 1230 int count = preempt_count(); 1231 char msgbuf[64]; 1232 int ret; 1233 1234 if (initcall_blacklisted(fn)) 1235 return -EPERM; 1236 1237 do_trace_initcall_start(fn); 1238 ret = fn(); 1239 do_trace_initcall_finish(fn, ret); 1240 1241 msgbuf[0] = 0; 1242 1243 if (preempt_count() != count) { 1244 sprintf(msgbuf, "preemption imbalance "); 1245 preempt_count_set(count); 1246 } 1247 if (irqs_disabled()) { 1248 strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf)); 1249 local_irq_enable(); 1250 } 1251 WARN(msgbuf[0], "initcall %pS returned with %s\n", fn, msgbuf); 1252 1253 add_latent_entropy(); 1254 return ret; 1255 } 1256 1257 1258 static initcall_entry_t *initcall_levels[] __initdata = { 1259 __initcall0_start, 1260 __initcall1_start, 1261 __initcall2_start, 1262 __initcall3_start, 1263 __initcall4_start, 1264 __initcall5_start, 1265 __initcall6_start, 1266 __initcall7_start, 1267 __initcall_end, 1268 }; 1269 1270 /* Keep these in sync with initcalls in include/linux/init.h */ 1271 static const char *initcall_level_names[] __initdata = { 1272 "pure", 1273 "core", 1274 "postcore", 1275 "arch", 1276 "subsys", 1277 "fs", 1278 "device", 1279 "late", 1280 }; 1281 1282 static int __init ignore_unknown_bootoption(char *param, char *val, 1283 const char *unused, void *arg) 1284 { 1285 return 0; 1286 } 1287 1288 static void __init do_initcall_level(int level, char *command_line) 1289 { 1290 initcall_entry_t *fn; 1291 1292 parse_args(initcall_level_names[level], 1293 command_line, __start___param, 1294 __stop___param - __start___param, 1295 level, level, 1296 NULL, ignore_unknown_bootoption); 1297 1298 trace_initcall_level(initcall_level_names[level]); 1299 for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++) 1300 do_one_initcall(initcall_from_entry(fn)); 1301 } 1302 1303 static void __init do_initcalls(void) 1304 { 1305 int level; 1306 size_t len = saved_command_line_len + 1; 1307 char *command_line; 1308 1309 command_line = kzalloc(len, GFP_KERNEL); 1310 if (!command_line) 1311 panic("%s: Failed to allocate %zu bytes\n", __func__, len); 1312 1313 for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) { 1314 /* Parser modifies command_line, restore it each time */ 1315 strcpy(command_line, saved_command_line); 1316 do_initcall_level(level, command_line); 1317 } 1318 1319 kfree(command_line); 1320 } 1321 1322 /* 1323 * Ok, the machine is now initialized. None of the devices 1324 * have been touched yet, but the CPU subsystem is up and 1325 * running, and memory and process management works. 1326 * 1327 * Now we can finally start doing some real work.. 1328 */ 1329 static void __init do_basic_setup(void) 1330 { 1331 cpuset_init_smp(); 1332 driver_init(); 1333 init_irq_proc(); 1334 do_ctors(); 1335 do_initcalls(); 1336 } 1337 1338 static void __init do_pre_smp_initcalls(void) 1339 { 1340 initcall_entry_t *fn; 1341 1342 trace_initcall_level("early"); 1343 for (fn = __initcall_start; fn < __initcall0_start; fn++) 1344 do_one_initcall(initcall_from_entry(fn)); 1345 } 1346 1347 static int run_init_process(const char *init_filename) 1348 { 1349 const char *const *p; 1350 1351 argv_init[0] = init_filename; 1352 pr_info("Run %s as init process\n", init_filename); 1353 pr_debug(" with arguments:\n"); 1354 for (p = argv_init; *p; p++) 1355 pr_debug(" %s\n", *p); 1356 pr_debug(" with environment:\n"); 1357 for (p = envp_init; *p; p++) 1358 pr_debug(" %s\n", *p); 1359 return kernel_execve(init_filename, argv_init, envp_init); 1360 } 1361 1362 static int try_to_run_init_process(const char *init_filename) 1363 { 1364 int ret; 1365 1366 ret = run_init_process(init_filename); 1367 1368 if (ret && ret != -ENOENT) { 1369 pr_err("Starting init: %s exists but couldn't execute it (error %d)\n", 1370 init_filename, ret); 1371 } 1372 1373 return ret; 1374 } 1375 1376 static noinline void __init kernel_init_freeable(void); 1377 1378 #if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX) 1379 bool rodata_enabled __ro_after_init = true; 1380 1381 #ifndef arch_parse_debug_rodata 1382 static inline bool arch_parse_debug_rodata(char *str) { return false; } 1383 #endif 1384 1385 static int __init set_debug_rodata(char *str) 1386 { 1387 if (arch_parse_debug_rodata(str)) 1388 return 0; 1389 1390 if (str && !strcmp(str, "on")) 1391 rodata_enabled = true; 1392 else if (str && !strcmp(str, "off")) 1393 rodata_enabled = false; 1394 else 1395 pr_warn("Invalid option string for rodata: '%s'\n", str); 1396 return 0; 1397 } 1398 early_param("rodata", set_debug_rodata); 1399 #endif 1400 1401 static void mark_readonly(void) 1402 { 1403 if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX) && rodata_enabled) { 1404 /* 1405 * load_module() results in W+X mappings, which are cleaned 1406 * up with init_free_wq. Let's make sure that queued work is 1407 * flushed so that we don't hit false positives looking for 1408 * insecure pages which are W+X. 1409 */ 1410 flush_module_init_free_work(); 1411 mark_rodata_ro(); 1412 debug_checkwx(); 1413 rodata_test(); 1414 } else if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX)) { 1415 pr_info("Kernel memory protection disabled.\n"); 1416 } else if (IS_ENABLED(CONFIG_ARCH_HAS_STRICT_KERNEL_RWX)) { 1417 pr_warn("Kernel memory protection not selected by kernel config.\n"); 1418 } else { 1419 pr_warn("This architecture does not have kernel memory protection.\n"); 1420 } 1421 } 1422 1423 void __weak free_initmem(void) 1424 { 1425 free_initmem_default(POISON_FREE_INITMEM); 1426 } 1427 1428 static int __ref kernel_init(void *unused) 1429 { 1430 int ret; 1431 1432 /* 1433 * Wait until kthreadd is all set-up. 1434 */ 1435 wait_for_completion(&kthreadd_done); 1436 1437 kernel_init_freeable(); 1438 /* need to finish all async __init code before freeing the memory */ 1439 async_synchronize_full(); 1440 1441 system_state = SYSTEM_FREEING_INITMEM; 1442 kprobe_free_init_mem(); 1443 ftrace_free_init_mem(); 1444 kgdb_free_init_mem(); 1445 exit_boot_config(); 1446 free_initmem(); 1447 mark_readonly(); 1448 1449 /* 1450 * Kernel mappings are now finalized - update the userspace page-table 1451 * to finalize PTI. 1452 */ 1453 pti_finalize(); 1454 1455 system_state = SYSTEM_RUNNING; 1456 numa_default_policy(); 1457 1458 rcu_end_inkernel_boot(); 1459 1460 do_sysctl_args(); 1461 1462 if (ramdisk_execute_command) { 1463 ret = run_init_process(ramdisk_execute_command); 1464 if (!ret) 1465 return 0; 1466 pr_err("Failed to execute %s (error %d)\n", 1467 ramdisk_execute_command, ret); 1468 } 1469 1470 /* 1471 * We try each of these until one succeeds. 1472 * 1473 * The Bourne shell can be used instead of init if we are 1474 * trying to recover a really broken machine. 1475 */ 1476 if (execute_command) { 1477 ret = run_init_process(execute_command); 1478 if (!ret) 1479 return 0; 1480 panic("Requested init %s failed (error %d).", 1481 execute_command, ret); 1482 } 1483 1484 if (CONFIG_DEFAULT_INIT[0] != '\0') { 1485 ret = run_init_process(CONFIG_DEFAULT_INIT); 1486 if (ret) 1487 pr_err("Default init %s failed (error %d)\n", 1488 CONFIG_DEFAULT_INIT, ret); 1489 else 1490 return 0; 1491 } 1492 1493 if (!try_to_run_init_process("/sbin/init") || 1494 !try_to_run_init_process("/etc/init") || 1495 !try_to_run_init_process("/bin/init") || 1496 !try_to_run_init_process("/bin/sh")) 1497 return 0; 1498 1499 panic("No working init found. Try passing init= option to kernel. " 1500 "See Linux Documentation/admin-guide/init.rst for guidance."); 1501 } 1502 1503 /* Open /dev/console, for stdin/stdout/stderr, this should never fail */ 1504 void __init console_on_rootfs(void) 1505 { 1506 struct file *file = filp_open("/dev/console", O_RDWR, 0); 1507 1508 if (IS_ERR(file)) { 1509 pr_err("Warning: unable to open an initial console.\n"); 1510 return; 1511 } 1512 init_dup(file); 1513 init_dup(file); 1514 init_dup(file); 1515 fput(file); 1516 } 1517 1518 static noinline void __init kernel_init_freeable(void) 1519 { 1520 /* Now the scheduler is fully set up and can do blocking allocations */ 1521 gfp_allowed_mask = __GFP_BITS_MASK; 1522 1523 /* 1524 * init can allocate pages on any node 1525 */ 1526 set_mems_allowed(node_states[N_MEMORY]); 1527 1528 cad_pid = get_pid(task_pid(current)); 1529 1530 smp_prepare_cpus(setup_max_cpus); 1531 1532 workqueue_init(); 1533 1534 init_mm_internals(); 1535 1536 rcu_init_tasks_generic(); 1537 do_pre_smp_initcalls(); 1538 lockup_detector_init(); 1539 1540 smp_init(); 1541 sched_init_smp(); 1542 1543 workqueue_init_topology(); 1544 async_init(); 1545 padata_init(); 1546 page_alloc_init_late(); 1547 1548 do_basic_setup(); 1549 1550 kunit_run_all_tests(); 1551 1552 wait_for_initramfs(); 1553 console_on_rootfs(); 1554 1555 /* 1556 * check if there is an early userspace init. If yes, let it do all 1557 * the work 1558 */ 1559 if (init_eaccess(ramdisk_execute_command) != 0) { 1560 ramdisk_execute_command = NULL; 1561 prepare_namespace(); 1562 } 1563 1564 /* 1565 * Ok, we have completed the initial bootup, and 1566 * we're essentially up and running. Get rid of the 1567 * initmem segments and start the user-mode stuff.. 1568 * 1569 * rootfs is available now, try loading the public keys 1570 * and default modules 1571 */ 1572 1573 integrity_load_keys(); 1574 } 1575