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