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