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 } 392 return 0; 393 } 394 395 static void __init setup_boot_config(const char *cmdline) 396 { 397 static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata; 398 const char *msg; 399 int pos; 400 u32 size, csum; 401 char *data, *copy, *err; 402 int ret; 403 404 /* Cut out the bootconfig data even if we have no bootconfig option */ 405 data = get_boot_config_from_initrd(&size, &csum); 406 407 strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); 408 err = parse_args("bootconfig", tmp_cmdline, NULL, 0, 0, 0, NULL, 409 bootconfig_params); 410 411 if (IS_ERR(err) || !bootconfig_found) 412 return; 413 414 /* parse_args() stops at '--' and returns an address */ 415 if (err) 416 initargs_found = true; 417 418 if (!data) { 419 pr_err("'bootconfig' found on command line, but no bootconfig found\n"); 420 return; 421 } 422 423 if (size >= XBC_DATA_MAX) { 424 pr_err("bootconfig size %d greater than max size %d\n", 425 size, XBC_DATA_MAX); 426 return; 427 } 428 429 if (boot_config_checksum((unsigned char *)data, size) != csum) { 430 pr_err("bootconfig checksum failed\n"); 431 return; 432 } 433 434 copy = memblock_alloc(size + 1, SMP_CACHE_BYTES); 435 if (!copy) { 436 pr_err("Failed to allocate memory for bootconfig\n"); 437 return; 438 } 439 440 memcpy(copy, data, size); 441 copy[size] = '\0'; 442 443 ret = xbc_init(copy, &msg, &pos); 444 if (ret < 0) { 445 if (pos < 0) 446 pr_err("Failed to init bootconfig: %s.\n", msg); 447 else 448 pr_err("Failed to parse bootconfig: %s at %d.\n", 449 msg, pos); 450 } else { 451 pr_info("Load bootconfig: %d bytes %d nodes\n", size, ret); 452 /* keys starting with "kernel." are passed via cmdline */ 453 extra_command_line = xbc_make_cmdline("kernel"); 454 /* Also, "init." keys are init arguments */ 455 extra_init_args = xbc_make_cmdline("init"); 456 } 457 return; 458 } 459 460 #else 461 462 static void __init setup_boot_config(const char *cmdline) 463 { 464 /* Remove bootconfig data from initrd */ 465 get_boot_config_from_initrd(NULL, NULL); 466 } 467 468 static int __init warn_bootconfig(char *str) 469 { 470 pr_warn("WARNING: 'bootconfig' found on the kernel command line but CONFIG_BOOTCONFIG is not set.\n"); 471 return 0; 472 } 473 early_param("bootconfig", warn_bootconfig); 474 475 #endif 476 477 /* Change NUL term back to "=", to make "param" the whole string. */ 478 static void __init repair_env_string(char *param, char *val) 479 { 480 if (val) { 481 /* param=val or param="val"? */ 482 if (val == param+strlen(param)+1) 483 val[-1] = '='; 484 else if (val == param+strlen(param)+2) { 485 val[-2] = '='; 486 memmove(val-1, val, strlen(val)+1); 487 } else 488 BUG(); 489 } 490 } 491 492 /* Anything after -- gets handed straight to init. */ 493 static int __init set_init_arg(char *param, char *val, 494 const char *unused, void *arg) 495 { 496 unsigned int i; 497 498 if (panic_later) 499 return 0; 500 501 repair_env_string(param, val); 502 503 for (i = 0; argv_init[i]; i++) { 504 if (i == MAX_INIT_ARGS) { 505 panic_later = "init"; 506 panic_param = param; 507 return 0; 508 } 509 } 510 argv_init[i] = param; 511 return 0; 512 } 513 514 /* 515 * Unknown boot options get handed to init, unless they look like 516 * unused parameters (modprobe will find them in /proc/cmdline). 517 */ 518 static int __init unknown_bootoption(char *param, char *val, 519 const char *unused, void *arg) 520 { 521 size_t len = strlen(param); 522 523 repair_env_string(param, val); 524 525 /* Handle obsolete-style parameters */ 526 if (obsolete_checksetup(param)) 527 return 0; 528 529 /* Unused module parameter. */ 530 if (strnchr(param, len, '.')) 531 return 0; 532 533 if (panic_later) 534 return 0; 535 536 if (val) { 537 /* Environment option */ 538 unsigned int i; 539 for (i = 0; envp_init[i]; i++) { 540 if (i == MAX_INIT_ENVS) { 541 panic_later = "env"; 542 panic_param = param; 543 } 544 if (!strncmp(param, envp_init[i], len+1)) 545 break; 546 } 547 envp_init[i] = param; 548 } else { 549 /* Command line option */ 550 unsigned int i; 551 for (i = 0; argv_init[i]; i++) { 552 if (i == MAX_INIT_ARGS) { 553 panic_later = "init"; 554 panic_param = param; 555 } 556 } 557 argv_init[i] = param; 558 } 559 return 0; 560 } 561 562 static int __init init_setup(char *str) 563 { 564 unsigned int i; 565 566 execute_command = str; 567 /* 568 * In case LILO is going to boot us with default command line, 569 * it prepends "auto" before the whole cmdline which makes 570 * the shell think it should execute a script with such name. 571 * So we ignore all arguments entered _before_ init=... [MJ] 572 */ 573 for (i = 1; i < MAX_INIT_ARGS; i++) 574 argv_init[i] = NULL; 575 return 1; 576 } 577 __setup("init=", init_setup); 578 579 static int __init rdinit_setup(char *str) 580 { 581 unsigned int i; 582 583 ramdisk_execute_command = str; 584 /* See "auto" comment in init_setup */ 585 for (i = 1; i < MAX_INIT_ARGS; i++) 586 argv_init[i] = NULL; 587 return 1; 588 } 589 __setup("rdinit=", rdinit_setup); 590 591 #ifndef CONFIG_SMP 592 static const unsigned int setup_max_cpus = NR_CPUS; 593 static inline void setup_nr_cpu_ids(void) { } 594 static inline void smp_prepare_cpus(unsigned int maxcpus) { } 595 #endif 596 597 /* 598 * We need to store the untouched command line for future reference. 599 * We also need to store the touched command line since the parameter 600 * parsing is performed in place, and we should allow a component to 601 * store reference of name/value for future reference. 602 */ 603 static void __init setup_command_line(char *command_line) 604 { 605 size_t len, xlen = 0, ilen = 0; 606 607 if (extra_command_line) 608 xlen = strlen(extra_command_line); 609 if (extra_init_args) 610 ilen = strlen(extra_init_args) + 4; /* for " -- " */ 611 612 len = xlen + strlen(boot_command_line) + 1; 613 614 saved_command_line = memblock_alloc(len + ilen, SMP_CACHE_BYTES); 615 if (!saved_command_line) 616 panic("%s: Failed to allocate %zu bytes\n", __func__, len + ilen); 617 618 static_command_line = memblock_alloc(len, SMP_CACHE_BYTES); 619 if (!static_command_line) 620 panic("%s: Failed to allocate %zu bytes\n", __func__, len); 621 622 if (xlen) { 623 /* 624 * We have to put extra_command_line before boot command 625 * lines because there could be dashes (separator of init 626 * command line) in the command lines. 627 */ 628 strcpy(saved_command_line, extra_command_line); 629 strcpy(static_command_line, extra_command_line); 630 } 631 strcpy(saved_command_line + xlen, boot_command_line); 632 strcpy(static_command_line + xlen, command_line); 633 634 if (ilen) { 635 /* 636 * Append supplemental init boot args to saved_command_line 637 * so that user can check what command line options passed 638 * to init. 639 */ 640 len = strlen(saved_command_line); 641 if (initargs_found) { 642 saved_command_line[len++] = ' '; 643 } else { 644 strcpy(saved_command_line + len, " -- "); 645 len += 4; 646 } 647 648 strcpy(saved_command_line + len, extra_init_args); 649 } 650 } 651 652 /* 653 * We need to finalize in a non-__init function or else race conditions 654 * between the root thread and the init thread may cause start_kernel to 655 * be reaped by free_initmem before the root thread has proceeded to 656 * cpu_idle. 657 * 658 * gcc-3.4 accidentally inlines this function, so use noinline. 659 */ 660 661 static __initdata DECLARE_COMPLETION(kthreadd_done); 662 663 noinline void __ref rest_init(void) 664 { 665 struct task_struct *tsk; 666 int pid; 667 668 rcu_scheduler_starting(); 669 /* 670 * We need to spawn init first so that it obtains pid 1, however 671 * the init task will end up wanting to create kthreads, which, if 672 * we schedule it before we create kthreadd, will OOPS. 673 */ 674 pid = kernel_thread(kernel_init, NULL, CLONE_FS); 675 /* 676 * Pin init on the boot CPU. Task migration is not properly working 677 * until sched_init_smp() has been run. It will set the allowed 678 * CPUs for init to the non isolated CPUs. 679 */ 680 rcu_read_lock(); 681 tsk = find_task_by_pid_ns(pid, &init_pid_ns); 682 set_cpus_allowed_ptr(tsk, cpumask_of(smp_processor_id())); 683 rcu_read_unlock(); 684 685 numa_default_policy(); 686 pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES); 687 rcu_read_lock(); 688 kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns); 689 rcu_read_unlock(); 690 691 /* 692 * Enable might_sleep() and smp_processor_id() checks. 693 * They cannot be enabled earlier because with CONFIG_PREEMPTION=y 694 * kernel_thread() would trigger might_sleep() splats. With 695 * CONFIG_PREEMPT_VOLUNTARY=y the init task might have scheduled 696 * already, but it's stuck on the kthreadd_done completion. 697 */ 698 system_state = SYSTEM_SCHEDULING; 699 700 complete(&kthreadd_done); 701 702 /* 703 * The boot idle thread must execute schedule() 704 * at least once to get things moving: 705 */ 706 schedule_preempt_disabled(); 707 /* Call into cpu_idle with preempt disabled */ 708 cpu_startup_entry(CPUHP_ONLINE); 709 } 710 711 /* Check for early params. */ 712 static int __init do_early_param(char *param, char *val, 713 const char *unused, void *arg) 714 { 715 const struct obs_kernel_param *p; 716 717 for (p = __setup_start; p < __setup_end; p++) { 718 if ((p->early && parameq(param, p->str)) || 719 (strcmp(param, "console") == 0 && 720 strcmp(p->str, "earlycon") == 0) 721 ) { 722 if (p->setup_func(val) != 0) 723 pr_warn("Malformed early option '%s'\n", param); 724 } 725 } 726 /* We accept everything at this stage. */ 727 return 0; 728 } 729 730 void __init parse_early_options(char *cmdline) 731 { 732 parse_args("early options", cmdline, NULL, 0, 0, 0, NULL, 733 do_early_param); 734 } 735 736 /* Arch code calls this early on, or if not, just before other parsing. */ 737 void __init parse_early_param(void) 738 { 739 static int done __initdata; 740 static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata; 741 742 if (done) 743 return; 744 745 /* All fall through to do_early_param. */ 746 strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); 747 parse_early_options(tmp_cmdline); 748 done = 1; 749 } 750 751 void __init __weak arch_post_acpi_subsys_init(void) { } 752 753 void __init __weak smp_setup_processor_id(void) 754 { 755 } 756 757 # if THREAD_SIZE >= PAGE_SIZE 758 void __init __weak thread_stack_cache_init(void) 759 { 760 } 761 #endif 762 763 void __init __weak mem_encrypt_init(void) { } 764 765 void __init __weak poking_init(void) { } 766 767 void __init __weak pgtable_cache_init(void) { } 768 769 bool initcall_debug; 770 core_param(initcall_debug, initcall_debug, bool, 0644); 771 772 #ifdef TRACEPOINTS_ENABLED 773 static void __init initcall_debug_enable(void); 774 #else 775 static inline void initcall_debug_enable(void) 776 { 777 } 778 #endif 779 780 /* Report memory auto-initialization states for this boot. */ 781 static void __init report_meminit(void) 782 { 783 const char *stack; 784 785 if (IS_ENABLED(CONFIG_INIT_STACK_ALL_PATTERN)) 786 stack = "all(pattern)"; 787 else if (IS_ENABLED(CONFIG_INIT_STACK_ALL_ZERO)) 788 stack = "all(zero)"; 789 else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL)) 790 stack = "byref_all(zero)"; 791 else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF)) 792 stack = "byref(zero)"; 793 else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_USER)) 794 stack = "__user(zero)"; 795 else 796 stack = "off"; 797 798 pr_info("mem auto-init: stack:%s, heap alloc:%s, heap free:%s\n", 799 stack, want_init_on_alloc(GFP_KERNEL) ? "on" : "off", 800 want_init_on_free() ? "on" : "off"); 801 if (want_init_on_free()) 802 pr_info("mem auto-init: clearing system memory may take some time...\n"); 803 } 804 805 /* 806 * Set up kernel memory allocators 807 */ 808 static void __init mm_init(void) 809 { 810 /* 811 * page_ext requires contiguous pages, 812 * bigger than MAX_ORDER unless SPARSEMEM. 813 */ 814 page_ext_init_flatmem(); 815 init_debug_pagealloc(); 816 report_meminit(); 817 mem_init(); 818 kmem_cache_init(); 819 kmemleak_init(); 820 pgtable_init(); 821 debug_objects_mem_init(); 822 vmalloc_init(); 823 ioremap_huge_init(); 824 /* Should be run before the first non-init thread is created */ 825 init_espfix_bsp(); 826 /* Should be run after espfix64 is set up. */ 827 pti_init(); 828 } 829 830 void __init __weak arch_call_rest_init(void) 831 { 832 rest_init(); 833 } 834 835 asmlinkage __visible void __init __no_sanitize_address start_kernel(void) 836 { 837 char *command_line; 838 char *after_dashes; 839 840 set_task_stack_end_magic(&init_task); 841 smp_setup_processor_id(); 842 debug_objects_early_init(); 843 844 cgroup_init_early(); 845 846 local_irq_disable(); 847 early_boot_irqs_disabled = true; 848 849 /* 850 * Interrupts are still disabled. Do necessary setups, then 851 * enable them. 852 */ 853 boot_cpu_init(); 854 page_address_init(); 855 pr_notice("%s", linux_banner); 856 early_security_init(); 857 setup_arch(&command_line); 858 setup_boot_config(command_line); 859 setup_command_line(command_line); 860 setup_nr_cpu_ids(); 861 setup_per_cpu_areas(); 862 smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ 863 boot_cpu_hotplug_init(); 864 865 build_all_zonelists(NULL); 866 page_alloc_init(); 867 868 pr_notice("Kernel command line: %s\n", saved_command_line); 869 /* parameters may set static keys */ 870 jump_label_init(); 871 parse_early_param(); 872 after_dashes = parse_args("Booting kernel", 873 static_command_line, __start___param, 874 __stop___param - __start___param, 875 -1, -1, NULL, &unknown_bootoption); 876 if (!IS_ERR_OR_NULL(after_dashes)) 877 parse_args("Setting init args", after_dashes, NULL, 0, -1, -1, 878 NULL, set_init_arg); 879 if (extra_init_args) 880 parse_args("Setting extra init args", extra_init_args, 881 NULL, 0, -1, -1, NULL, set_init_arg); 882 883 /* 884 * These use large bootmem allocations and must precede 885 * kmem_cache_init() 886 */ 887 setup_log_buf(0); 888 vfs_caches_init_early(); 889 sort_main_extable(); 890 trap_init(); 891 mm_init(); 892 893 ftrace_init(); 894 895 /* trace_printk can be enabled here */ 896 early_trace_init(); 897 898 /* 899 * Set up the scheduler prior starting any interrupts (such as the 900 * timer interrupt). Full topology setup happens at smp_init() 901 * time - but meanwhile we still have a functioning scheduler. 902 */ 903 sched_init(); 904 /* 905 * Disable preemption - early bootup scheduling is extremely 906 * fragile until we cpu_idle() for the first time. 907 */ 908 preempt_disable(); 909 if (WARN(!irqs_disabled(), 910 "Interrupts were enabled *very* early, fixing it\n")) 911 local_irq_disable(); 912 radix_tree_init(); 913 914 /* 915 * Set up housekeeping before setting up workqueues to allow the unbound 916 * workqueue to take non-housekeeping into account. 917 */ 918 housekeeping_init(); 919 920 /* 921 * Allow workqueue creation and work item queueing/cancelling 922 * early. Work item execution depends on kthreads and starts after 923 * workqueue_init(). 924 */ 925 workqueue_init_early(); 926 927 rcu_init(); 928 929 /* Trace events are available after this */ 930 trace_init(); 931 932 if (initcall_debug) 933 initcall_debug_enable(); 934 935 context_tracking_init(); 936 /* init some links before init_ISA_irqs() */ 937 early_irq_init(); 938 init_IRQ(); 939 tick_init(); 940 rcu_init_nohz(); 941 init_timers(); 942 hrtimers_init(); 943 softirq_init(); 944 timekeeping_init(); 945 946 /* 947 * For best initial stack canary entropy, prepare it after: 948 * - setup_arch() for any UEFI RNG entropy and boot cmdline access 949 * - timekeeping_init() for ktime entropy used in rand_initialize() 950 * - rand_initialize() to get any arch-specific entropy like RDRAND 951 * - add_latent_entropy() to get any latent entropy 952 * - adding command line entropy 953 */ 954 rand_initialize(); 955 add_latent_entropy(); 956 add_device_randomness(command_line, strlen(command_line)); 957 boot_init_stack_canary(); 958 959 time_init(); 960 perf_event_init(); 961 profile_init(); 962 call_function_init(); 963 WARN(!irqs_disabled(), "Interrupts were enabled early\n"); 964 965 early_boot_irqs_disabled = false; 966 local_irq_enable(); 967 968 kmem_cache_init_late(); 969 970 /* 971 * HACK ALERT! This is early. We're enabling the console before 972 * we've done PCI setups etc, and console_init() must be aware of 973 * this. But we do want output early, in case something goes wrong. 974 */ 975 console_init(); 976 if (panic_later) 977 panic("Too many boot %s vars at `%s'", panic_later, 978 panic_param); 979 980 lockdep_init(); 981 982 /* 983 * Need to run this when irqs are enabled, because it wants 984 * to self-test [hard/soft]-irqs on/off lock inversion bugs 985 * too: 986 */ 987 locking_selftest(); 988 989 /* 990 * This needs to be called before any devices perform DMA 991 * operations that might use the SWIOTLB bounce buffers. It will 992 * mark the bounce buffers as decrypted so that their usage will 993 * not cause "plain-text" data to be decrypted when accessed. 994 */ 995 mem_encrypt_init(); 996 997 #ifdef CONFIG_BLK_DEV_INITRD 998 if (initrd_start && !initrd_below_start_ok && 999 page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) { 1000 pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n", 1001 page_to_pfn(virt_to_page((void *)initrd_start)), 1002 min_low_pfn); 1003 initrd_start = 0; 1004 } 1005 #endif 1006 setup_per_cpu_pageset(); 1007 numa_policy_init(); 1008 acpi_early_init(); 1009 if (late_time_init) 1010 late_time_init(); 1011 sched_clock_init(); 1012 calibrate_delay(); 1013 pid_idr_init(); 1014 anon_vma_init(); 1015 #ifdef CONFIG_X86 1016 if (efi_enabled(EFI_RUNTIME_SERVICES)) 1017 efi_enter_virtual_mode(); 1018 #endif 1019 thread_stack_cache_init(); 1020 cred_init(); 1021 fork_init(); 1022 proc_caches_init(); 1023 uts_ns_init(); 1024 buffer_init(); 1025 key_init(); 1026 security_init(); 1027 dbg_late_init(); 1028 vfs_caches_init(); 1029 pagecache_init(); 1030 signals_init(); 1031 seq_file_init(); 1032 proc_root_init(); 1033 nsfs_init(); 1034 cpuset_init(); 1035 cgroup_init(); 1036 taskstats_init_early(); 1037 delayacct_init(); 1038 1039 poking_init(); 1040 check_bugs(); 1041 1042 acpi_subsystem_init(); 1043 arch_post_acpi_subsys_init(); 1044 sfi_init_late(); 1045 kcsan_init(); 1046 1047 /* Do the rest non-__init'ed, we're now alive */ 1048 arch_call_rest_init(); 1049 1050 prevent_tail_call_optimization(); 1051 } 1052 1053 /* Call all constructor functions linked into the kernel. */ 1054 static void __init do_ctors(void) 1055 { 1056 #ifdef CONFIG_CONSTRUCTORS 1057 ctor_fn_t *fn = (ctor_fn_t *) __ctors_start; 1058 1059 for (; fn < (ctor_fn_t *) __ctors_end; fn++) 1060 (*fn)(); 1061 #endif 1062 } 1063 1064 #ifdef CONFIG_KALLSYMS 1065 struct blacklist_entry { 1066 struct list_head next; 1067 char *buf; 1068 }; 1069 1070 static __initdata_or_module LIST_HEAD(blacklisted_initcalls); 1071 1072 static int __init initcall_blacklist(char *str) 1073 { 1074 char *str_entry; 1075 struct blacklist_entry *entry; 1076 1077 /* str argument is a comma-separated list of functions */ 1078 do { 1079 str_entry = strsep(&str, ","); 1080 if (str_entry) { 1081 pr_debug("blacklisting initcall %s\n", str_entry); 1082 entry = memblock_alloc(sizeof(*entry), 1083 SMP_CACHE_BYTES); 1084 if (!entry) 1085 panic("%s: Failed to allocate %zu bytes\n", 1086 __func__, sizeof(*entry)); 1087 entry->buf = memblock_alloc(strlen(str_entry) + 1, 1088 SMP_CACHE_BYTES); 1089 if (!entry->buf) 1090 panic("%s: Failed to allocate %zu bytes\n", 1091 __func__, strlen(str_entry) + 1); 1092 strcpy(entry->buf, str_entry); 1093 list_add(&entry->next, &blacklisted_initcalls); 1094 } 1095 } while (str_entry); 1096 1097 return 0; 1098 } 1099 1100 static bool __init_or_module initcall_blacklisted(initcall_t fn) 1101 { 1102 struct blacklist_entry *entry; 1103 char fn_name[KSYM_SYMBOL_LEN]; 1104 unsigned long addr; 1105 1106 if (list_empty(&blacklisted_initcalls)) 1107 return false; 1108 1109 addr = (unsigned long) dereference_function_descriptor(fn); 1110 sprint_symbol_no_offset(fn_name, addr); 1111 1112 /* 1113 * fn will be "function_name [module_name]" where [module_name] is not 1114 * displayed for built-in init functions. Strip off the [module_name]. 1115 */ 1116 strreplace(fn_name, ' ', '\0'); 1117 1118 list_for_each_entry(entry, &blacklisted_initcalls, next) { 1119 if (!strcmp(fn_name, entry->buf)) { 1120 pr_debug("initcall %s blacklisted\n", fn_name); 1121 return true; 1122 } 1123 } 1124 1125 return false; 1126 } 1127 #else 1128 static int __init initcall_blacklist(char *str) 1129 { 1130 pr_warn("initcall_blacklist requires CONFIG_KALLSYMS\n"); 1131 return 0; 1132 } 1133 1134 static bool __init_or_module initcall_blacklisted(initcall_t fn) 1135 { 1136 return false; 1137 } 1138 #endif 1139 __setup("initcall_blacklist=", initcall_blacklist); 1140 1141 static __init_or_module void 1142 trace_initcall_start_cb(void *data, initcall_t fn) 1143 { 1144 ktime_t *calltime = (ktime_t *)data; 1145 1146 printk(KERN_DEBUG "calling %pS @ %i\n", fn, task_pid_nr(current)); 1147 *calltime = ktime_get(); 1148 } 1149 1150 static __init_or_module void 1151 trace_initcall_finish_cb(void *data, initcall_t fn, int ret) 1152 { 1153 ktime_t *calltime = (ktime_t *)data; 1154 ktime_t delta, rettime; 1155 unsigned long long duration; 1156 1157 rettime = ktime_get(); 1158 delta = ktime_sub(rettime, *calltime); 1159 duration = (unsigned long long) ktime_to_ns(delta) >> 10; 1160 printk(KERN_DEBUG "initcall %pS returned %d after %lld usecs\n", 1161 fn, ret, duration); 1162 } 1163 1164 static ktime_t initcall_calltime; 1165 1166 #ifdef TRACEPOINTS_ENABLED 1167 static void __init initcall_debug_enable(void) 1168 { 1169 int ret; 1170 1171 ret = register_trace_initcall_start(trace_initcall_start_cb, 1172 &initcall_calltime); 1173 ret |= register_trace_initcall_finish(trace_initcall_finish_cb, 1174 &initcall_calltime); 1175 WARN(ret, "Failed to register initcall tracepoints\n"); 1176 } 1177 # define do_trace_initcall_start trace_initcall_start 1178 # define do_trace_initcall_finish trace_initcall_finish 1179 #else 1180 static inline void do_trace_initcall_start(initcall_t fn) 1181 { 1182 if (!initcall_debug) 1183 return; 1184 trace_initcall_start_cb(&initcall_calltime, fn); 1185 } 1186 static inline void do_trace_initcall_finish(initcall_t fn, int ret) 1187 { 1188 if (!initcall_debug) 1189 return; 1190 trace_initcall_finish_cb(&initcall_calltime, fn, ret); 1191 } 1192 #endif /* !TRACEPOINTS_ENABLED */ 1193 1194 int __init_or_module do_one_initcall(initcall_t fn) 1195 { 1196 int count = preempt_count(); 1197 char msgbuf[64]; 1198 int ret; 1199 1200 if (initcall_blacklisted(fn)) 1201 return -EPERM; 1202 1203 do_trace_initcall_start(fn); 1204 ret = fn(); 1205 do_trace_initcall_finish(fn, ret); 1206 1207 msgbuf[0] = 0; 1208 1209 if (preempt_count() != count) { 1210 sprintf(msgbuf, "preemption imbalance "); 1211 preempt_count_set(count); 1212 } 1213 if (irqs_disabled()) { 1214 strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf)); 1215 local_irq_enable(); 1216 } 1217 WARN(msgbuf[0], "initcall %pS returned with %s\n", fn, msgbuf); 1218 1219 add_latent_entropy(); 1220 return ret; 1221 } 1222 1223 1224 extern initcall_entry_t __initcall_start[]; 1225 extern initcall_entry_t __initcall0_start[]; 1226 extern initcall_entry_t __initcall1_start[]; 1227 extern initcall_entry_t __initcall2_start[]; 1228 extern initcall_entry_t __initcall3_start[]; 1229 extern initcall_entry_t __initcall4_start[]; 1230 extern initcall_entry_t __initcall5_start[]; 1231 extern initcall_entry_t __initcall6_start[]; 1232 extern initcall_entry_t __initcall7_start[]; 1233 extern initcall_entry_t __initcall_end[]; 1234 1235 static initcall_entry_t *initcall_levels[] __initdata = { 1236 __initcall0_start, 1237 __initcall1_start, 1238 __initcall2_start, 1239 __initcall3_start, 1240 __initcall4_start, 1241 __initcall5_start, 1242 __initcall6_start, 1243 __initcall7_start, 1244 __initcall_end, 1245 }; 1246 1247 /* Keep these in sync with initcalls in include/linux/init.h */ 1248 static const char *initcall_level_names[] __initdata = { 1249 "pure", 1250 "core", 1251 "postcore", 1252 "arch", 1253 "subsys", 1254 "fs", 1255 "device", 1256 "late", 1257 }; 1258 1259 static int __init ignore_unknown_bootoption(char *param, char *val, 1260 const char *unused, void *arg) 1261 { 1262 return 0; 1263 } 1264 1265 static void __init do_initcall_level(int level, char *command_line) 1266 { 1267 initcall_entry_t *fn; 1268 1269 parse_args(initcall_level_names[level], 1270 command_line, __start___param, 1271 __stop___param - __start___param, 1272 level, level, 1273 NULL, ignore_unknown_bootoption); 1274 1275 trace_initcall_level(initcall_level_names[level]); 1276 for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++) 1277 do_one_initcall(initcall_from_entry(fn)); 1278 } 1279 1280 static void __init do_initcalls(void) 1281 { 1282 int level; 1283 size_t len = strlen(saved_command_line) + 1; 1284 char *command_line; 1285 1286 command_line = kzalloc(len, GFP_KERNEL); 1287 if (!command_line) 1288 panic("%s: Failed to allocate %zu bytes\n", __func__, len); 1289 1290 for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) { 1291 /* Parser modifies command_line, restore it each time */ 1292 strcpy(command_line, saved_command_line); 1293 do_initcall_level(level, command_line); 1294 } 1295 1296 kfree(command_line); 1297 } 1298 1299 /* 1300 * Ok, the machine is now initialized. None of the devices 1301 * have been touched yet, but the CPU subsystem is up and 1302 * running, and memory and process management works. 1303 * 1304 * Now we can finally start doing some real work.. 1305 */ 1306 static void __init do_basic_setup(void) 1307 { 1308 cpuset_init_smp(); 1309 driver_init(); 1310 init_irq_proc(); 1311 do_ctors(); 1312 usermodehelper_enable(); 1313 do_initcalls(); 1314 } 1315 1316 static void __init do_pre_smp_initcalls(void) 1317 { 1318 initcall_entry_t *fn; 1319 1320 trace_initcall_level("early"); 1321 for (fn = __initcall_start; fn < __initcall0_start; fn++) 1322 do_one_initcall(initcall_from_entry(fn)); 1323 } 1324 1325 static int run_init_process(const char *init_filename) 1326 { 1327 const char *const *p; 1328 1329 argv_init[0] = init_filename; 1330 pr_info("Run %s as init process\n", init_filename); 1331 pr_debug(" with arguments:\n"); 1332 for (p = argv_init; *p; p++) 1333 pr_debug(" %s\n", *p); 1334 pr_debug(" with environment:\n"); 1335 for (p = envp_init; *p; p++) 1336 pr_debug(" %s\n", *p); 1337 return kernel_execve(init_filename, argv_init, envp_init); 1338 } 1339 1340 static int try_to_run_init_process(const char *init_filename) 1341 { 1342 int ret; 1343 1344 ret = run_init_process(init_filename); 1345 1346 if (ret && ret != -ENOENT) { 1347 pr_err("Starting init: %s exists but couldn't execute it (error %d)\n", 1348 init_filename, ret); 1349 } 1350 1351 return ret; 1352 } 1353 1354 static noinline void __init kernel_init_freeable(void); 1355 1356 #if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX) 1357 bool rodata_enabled __ro_after_init = true; 1358 static int __init set_debug_rodata(char *str) 1359 { 1360 return strtobool(str, &rodata_enabled); 1361 } 1362 __setup("rodata=", set_debug_rodata); 1363 #endif 1364 1365 #ifdef CONFIG_STRICT_KERNEL_RWX 1366 static void mark_readonly(void) 1367 { 1368 if (rodata_enabled) { 1369 /* 1370 * load_module() results in W+X mappings, which are cleaned 1371 * up with call_rcu(). Let's make sure that queued work is 1372 * flushed so that we don't hit false positives looking for 1373 * insecure pages which are W+X. 1374 */ 1375 rcu_barrier(); 1376 mark_rodata_ro(); 1377 rodata_test(); 1378 } else 1379 pr_info("Kernel memory protection disabled.\n"); 1380 } 1381 #elif defined(CONFIG_ARCH_HAS_STRICT_KERNEL_RWX) 1382 static inline void mark_readonly(void) 1383 { 1384 pr_warn("Kernel memory protection not selected by kernel config.\n"); 1385 } 1386 #else 1387 static inline void mark_readonly(void) 1388 { 1389 pr_warn("This architecture does not have kernel memory protection.\n"); 1390 } 1391 #endif 1392 1393 void __weak free_initmem(void) 1394 { 1395 free_initmem_default(POISON_FREE_INITMEM); 1396 } 1397 1398 static int __ref kernel_init(void *unused) 1399 { 1400 int ret; 1401 1402 kernel_init_freeable(); 1403 /* need to finish all async __init code before freeing the memory */ 1404 async_synchronize_full(); 1405 ftrace_free_init_mem(); 1406 free_initmem(); 1407 mark_readonly(); 1408 1409 /* 1410 * Kernel mappings are now finalized - update the userspace page-table 1411 * to finalize PTI. 1412 */ 1413 pti_finalize(); 1414 1415 system_state = SYSTEM_RUNNING; 1416 numa_default_policy(); 1417 1418 rcu_end_inkernel_boot(); 1419 1420 do_sysctl_args(); 1421 1422 if (ramdisk_execute_command) { 1423 ret = run_init_process(ramdisk_execute_command); 1424 if (!ret) 1425 return 0; 1426 pr_err("Failed to execute %s (error %d)\n", 1427 ramdisk_execute_command, ret); 1428 } 1429 1430 /* 1431 * We try each of these until one succeeds. 1432 * 1433 * The Bourne shell can be used instead of init if we are 1434 * trying to recover a really broken machine. 1435 */ 1436 if (execute_command) { 1437 ret = run_init_process(execute_command); 1438 if (!ret) 1439 return 0; 1440 panic("Requested init %s failed (error %d).", 1441 execute_command, ret); 1442 } 1443 1444 if (CONFIG_DEFAULT_INIT[0] != '\0') { 1445 ret = run_init_process(CONFIG_DEFAULT_INIT); 1446 if (ret) 1447 pr_err("Default init %s failed (error %d)\n", 1448 CONFIG_DEFAULT_INIT, ret); 1449 else 1450 return 0; 1451 } 1452 1453 if (!try_to_run_init_process("/sbin/init") || 1454 !try_to_run_init_process("/etc/init") || 1455 !try_to_run_init_process("/bin/init") || 1456 !try_to_run_init_process("/bin/sh")) 1457 return 0; 1458 1459 panic("No working init found. Try passing init= option to kernel. " 1460 "See Linux Documentation/admin-guide/init.rst for guidance."); 1461 } 1462 1463 /* Open /dev/console, for stdin/stdout/stderr, this should never fail */ 1464 void __init console_on_rootfs(void) 1465 { 1466 struct file *file = filp_open("/dev/console", O_RDWR, 0); 1467 1468 if (IS_ERR(file)) { 1469 pr_err("Warning: unable to open an initial console.\n"); 1470 return; 1471 } 1472 init_dup(file); 1473 init_dup(file); 1474 init_dup(file); 1475 fput(file); 1476 } 1477 1478 static noinline void __init kernel_init_freeable(void) 1479 { 1480 /* 1481 * Wait until kthreadd is all set-up. 1482 */ 1483 wait_for_completion(&kthreadd_done); 1484 1485 /* Now the scheduler is fully set up and can do blocking allocations */ 1486 gfp_allowed_mask = __GFP_BITS_MASK; 1487 1488 /* 1489 * init can allocate pages on any node 1490 */ 1491 set_mems_allowed(node_states[N_MEMORY]); 1492 1493 cad_pid = task_pid(current); 1494 1495 smp_prepare_cpus(setup_max_cpus); 1496 1497 workqueue_init(); 1498 1499 init_mm_internals(); 1500 1501 do_pre_smp_initcalls(); 1502 lockup_detector_init(); 1503 1504 smp_init(); 1505 sched_init_smp(); 1506 1507 padata_init(); 1508 page_alloc_init_late(); 1509 /* Initialize page ext after all struct pages are initialized. */ 1510 page_ext_init(); 1511 1512 do_basic_setup(); 1513 1514 console_on_rootfs(); 1515 1516 /* 1517 * check if there is an early userspace init. If yes, let it do all 1518 * the work 1519 */ 1520 if (init_eaccess(ramdisk_execute_command) != 0) { 1521 ramdisk_execute_command = NULL; 1522 prepare_namespace(); 1523 } 1524 1525 /* 1526 * Ok, we have completed the initial bootup, and 1527 * we're essentially up and running. Get rid of the 1528 * initmem segments and start the user-mode stuff.. 1529 * 1530 * rootfs is available now, try loading the public keys 1531 * and default modules 1532 */ 1533 1534 integrity_load_keys(); 1535 } 1536