projects/linux·blob v5.13 · refs

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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 <[email protected]>
11 */
12
13#define DEBUG /* Enable initcall_debug */
14
15#include <linux/types.h>
16#include <linux/extable.h>
17#include <linux/module.h>
18#include <linux/proc_fs.h>
19#include <linux/binfmts.h>
20#include <linux/kernel.h>
21#include <linux/syscalls.h>
22#include <linux/stackprotector.h>
23#include <linux/string.h>
24#include <linux/ctype.h>
25#include <linux/delay.h>
26#include <linux/ioport.h>
27#include <linux/init.h>
28#include <linux/initrd.h>
29#include <linux/memblock.h>
30#include <linux/acpi.h>
31#include <linux/bootconfig.h>
32#include <linux/console.h>
33#include <linux/nmi.h>
34#include <linux/percpu.h>
35#include <linux/kmod.h>
36#include <linux/kprobes.h>
37#include <linux/vmalloc.h>
38#include <linux/kernel_stat.h>
39#include <linux/start_kernel.h>
40#include <linux/security.h>
41#include <linux/smp.h>
42#include <linux/profile.h>
43#include <linux/kfence.h>
44#include <linux/rcupdate.h>
45#include <linux/moduleparam.h>
46#include <linux/kallsyms.h>
47#include <linux/writeback.h>
48#include <linux/cpu.h>
49#include <linux/cpuset.h>
50#include <linux/cgroup.h>
51#include <linux/efi.h>
52#include <linux/tick.h>
53#include <linux/sched/isolation.h>
54#include <linux/interrupt.h>
55#include <linux/taskstats_kern.h>
56#include <linux/delayacct.h>
57#include <linux/unistd.h>
58#include <linux/utsname.h>
59#include <linux/rmap.h>
60#include <linux/mempolicy.h>
61#include <linux/key.h>
62#include <linux/page_ext.h>
63#include <linux/debug_locks.h>
64#include <linux/debugobjects.h>
65#include <linux/lockdep.h>
66#include <linux/kmemleak.h>
67#include <linux/padata.h>
68#include <linux/pid_namespace.h>
69#include <linux/device/driver.h>
70#include <linux/kthread.h>
71#include <linux/sched.h>
72#include <linux/sched/init.h>
73#include <linux/signal.h>
74#include <linux/idr.h>
75#include <linux/kgdb.h>
76#include <linux/ftrace.h>
77#include <linux/async.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#include <linux/stackdepot.h>
101
102#include <asm/io.h>
103#include <asm/bugs.h>
104#include <asm/setup.h>
105#include <asm/sections.h>
106#include <asm/cacheflush.h>
107
108#define CREATE_TRACE_POINTS
109#include <trace/events/initcall.h>
110
111#include <kunit/test.h>
112
113static int kernel_init(void *);
114
115extern void init_IRQ(void);
116extern void radix_tree_init(void);
117
118/*
119 * Debug helper: via this flag we know that we are in 'early bootup code'
120 * where only the boot processor is running with IRQ disabled. This means
121 * two things - IRQ must not be enabled before the flag is cleared and some
122 * operations which are not allowed with IRQ disabled are allowed while the
123 * flag is set.
124 */
125bool early_boot_irqs_disabled __read_mostly;
126
127enum system_states system_state __read_mostly;
128EXPORT_SYMBOL(system_state);
129
130/*
131 * Boot command-line arguments
132 */
133#define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT
134#define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT
135
136extern void time_init(void);
137/* Default late time init is NULL. archs can override this later. */
138void (*__initdata late_time_init)(void);
139
140/* Untouched command line saved by arch-specific code. */
141char __initdata boot_command_line[COMMAND_LINE_SIZE];
142/* Untouched saved command line (eg. for /proc) */
143char *saved_command_line;
144/* Command line for parameter parsing */
145static char *static_command_line;
146/* Untouched extra command line */
147static char *extra_command_line;
148/* Extra init arguments */
149static char *extra_init_args;
150
151#ifdef CONFIG_BOOT_CONFIG
152/* Is bootconfig on command line? */
153static bool bootconfig_found;
154static bool initargs_found;
155#else
156# define bootconfig_found false
157# define initargs_found false
158#endif
159
160static char *execute_command;
161static char *ramdisk_execute_command = "/init";
162
163/*
164 * Used to generate warnings if static_key manipulation functions are used
165 * before jump_label_init is called.
166 */
167bool static_key_initialized __read_mostly;
168EXPORT_SYMBOL_GPL(static_key_initialized);
169
170/*
171 * If set, this is an indication to the drivers that reset the underlying
172 * device before going ahead with the initialization otherwise driver might
173 * rely on the BIOS and skip the reset operation.
174 *
175 * This is useful if kernel is booting in an unreliable environment.
176 * For ex. kdump situation where previous kernel has crashed, BIOS has been
177 * skipped and devices will be in unknown state.
178 */
179unsigned int reset_devices;
180EXPORT_SYMBOL(reset_devices);
181
182static int __init set_reset_devices(char *str)
183{
184 reset_devices = 1;
185 return 1;
186}
187
188__setup("reset_devices", set_reset_devices);
189
190static const char *argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };
191const char *envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, };
192static const char *panic_later, *panic_param;
193
194extern const struct obs_kernel_param __setup_start[], __setup_end[];
195
196static bool __init obsolete_checksetup(char *line)
197{
198 const struct obs_kernel_param *p;
199 bool had_early_param = false;
200
201 p = __setup_start;
202 do {
203 int n = strlen(p->str);
204 if (parameqn(line, p->str, n)) {
205 if (p->early) {
206 /* Already done in parse_early_param?
207 * (Needs exact match on param part).
208 * Keep iterating, as we can have early
209 * params and __setups of same names 8( */
210 if (line[n] == '\0' || line[n] == '=')
211 had_early_param = true;
212 } else if (!p->setup_func) {
213 pr_warn("Parameter %s is obsolete, ignored\n",
214 p->str);
215 return true;
216 } else if (p->setup_func(line + n))
217 return true;
218 }
219 p++;
220 } while (p < __setup_end);
221
222 return had_early_param;
223}
224
225/*
226 * This should be approx 2 Bo*oMips to start (note initial shift), and will
227 * still work even if initially too large, it will just take slightly longer
228 */
229unsigned long loops_per_jiffy = (1<<12);
230EXPORT_SYMBOL(loops_per_jiffy);
231
232static int __init debug_kernel(char *str)
233{
234 console_loglevel = CONSOLE_LOGLEVEL_DEBUG;
235 return 0;
236}
237
238static int __init quiet_kernel(char *str)
239{
240 console_loglevel = CONSOLE_LOGLEVEL_QUIET;
241 return 0;
242}
243
244early_param("debug", debug_kernel);
245early_param("quiet", quiet_kernel);
246
247static int __init loglevel(char *str)
248{
249 int newlevel;
250
251 /*
252 * Only update loglevel value when a correct setting was passed,
253 * to prevent blind crashes (when loglevel being set to 0) that
254 * are quite hard to debug
255 */
256 if (get_option(&str, &newlevel)) {
257 console_loglevel = newlevel;
258 return 0;
259 }
260
261 return -EINVAL;
262}
263
264early_param("loglevel", loglevel);
265
266#ifdef CONFIG_BLK_DEV_INITRD
267static void * __init get_boot_config_from_initrd(u32 *_size, u32 *_csum)
268{
269 u32 size, csum;
270 char *data;
271 u32 *hdr;
272 int i;
273
274 if (!initrd_end)
275 return NULL;
276
277 data = (char *)initrd_end - BOOTCONFIG_MAGIC_LEN;
278 /*
279 * Since Grub may align the size of initrd to 4, we must
280 * check the preceding 3 bytes as well.
281 */
282 for (i = 0; i < 4; i++) {
283 if (!memcmp(data, BOOTCONFIG_MAGIC, BOOTCONFIG_MAGIC_LEN))
284 goto found;
285 data--;
286 }
287 return NULL;
288
289found:
290 hdr = (u32 *)(data - 8);
291 size = le32_to_cpu(hdr[0]);
292 csum = le32_to_cpu(hdr[1]);
293
294 data = ((void *)hdr) - size;
295 if ((unsigned long)data < initrd_start) {
296 pr_err("bootconfig size %d is greater than initrd size %ld\n",
297 size, initrd_end - initrd_start);
298 return NULL;
299 }
300
301 /* Remove bootconfig from initramfs/initrd */
302 initrd_end = (unsigned long)data;
303 if (_size)
304 *_size = size;
305 if (_csum)
306 *_csum = csum;
307
308 return data;
309}
310#else
311static void * __init get_boot_config_from_initrd(u32 *_size, u32 *_csum)
312{
313 return NULL;
314}
315#endif
316
317#ifdef CONFIG_BOOT_CONFIG
318
319static char xbc_namebuf[XBC_KEYLEN_MAX] __initdata;
320
321#define rest(dst, end) ((end) > (dst) ? (end) - (dst) : 0)
322
323static int __init xbc_snprint_cmdline(char *buf, size_t size,
324 struct xbc_node *root)
325{
326 struct xbc_node *knode, *vnode;
327 char *end = buf + size;
328 const char *val;
329 int ret;
330
331 xbc_node_for_each_key_value(root, knode, val) {
332 ret = xbc_node_compose_key_after(root, knode,
333 xbc_namebuf, XBC_KEYLEN_MAX);
334 if (ret < 0)
335 return ret;
336
337 vnode = xbc_node_get_child(knode);
338 if (!vnode) {
339 ret = snprintf(buf, rest(buf, end), "%s ", xbc_namebuf);
340 if (ret < 0)
341 return ret;
342 buf += ret;
343 continue;
344 }
345 xbc_array_for_each_value(vnode, val) {
346 ret = snprintf(buf, rest(buf, end), "%s=\"%s\" ",
347 xbc_namebuf, val);
348 if (ret < 0)
349 return ret;
350 buf += ret;
351 }
352 }
353
354 return buf - (end - size);
355}
356#undef rest
357
358/* Make an extra command line under given key word */
359static char * __init xbc_make_cmdline(const char *key)
360{
361 struct xbc_node *root;
362 char *new_cmdline;
363 int ret, len = 0;
364
365 root = xbc_find_node(key);
366 if (!root)
367 return NULL;
368
369 /* Count required buffer size */
370 len = xbc_snprint_cmdline(NULL, 0, root);
371 if (len <= 0)
372 return NULL;
373
374 new_cmdline = memblock_alloc(len + 1, SMP_CACHE_BYTES);
375 if (!new_cmdline) {
376 pr_err("Failed to allocate memory for extra kernel cmdline.\n");
377 return NULL;
378 }
379
380 ret = xbc_snprint_cmdline(new_cmdline, len + 1, root);
381 if (ret < 0 || ret > len) {
382 pr_err("Failed to print extra kernel cmdline.\n");
383 return NULL;
384 }
385
386 return new_cmdline;
387}
388
389static u32 boot_config_checksum(unsigned char *p, u32 size)
390{
391 u32 ret = 0;
392
393 while (size--)
394 ret += *p++;
395
396 return ret;
397}
398
399static int __init bootconfig_params(char *param, char *val,
400 const char *unused, void *arg)
401{
402 if (strcmp(param, "bootconfig") == 0) {
403 bootconfig_found = true;
404 }
405 return 0;
406}
407
408static void __init setup_boot_config(void)
409{
410 static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata;
411 const char *msg;
412 int pos;
413 u32 size, csum;
414 char *data, *copy, *err;
415 int ret;
416
417 /* Cut out the bootconfig data even if we have no bootconfig option */
418 data = get_boot_config_from_initrd(&size, &csum);
419
420 strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
421 err = parse_args("bootconfig", tmp_cmdline, NULL, 0, 0, 0, NULL,
422 bootconfig_params);
423
424 if (IS_ERR(err) || !bootconfig_found)
425 return;
426
427 /* parse_args() stops at '--' and returns an address */
428 if (err)
429 initargs_found = true;
430
431 if (!data) {
432 pr_err("'bootconfig' found on command line, but no bootconfig found\n");
433 return;
434 }
435
436 if (size >= XBC_DATA_MAX) {
437 pr_err("bootconfig size %d greater than max size %d\n",
438 size, XBC_DATA_MAX);
439 return;
440 }
441
442 if (boot_config_checksum((unsigned char *)data, size) != csum) {
443 pr_err("bootconfig checksum failed\n");
444 return;
445 }
446
447 copy = memblock_alloc(size + 1, SMP_CACHE_BYTES);
448 if (!copy) {
449 pr_err("Failed to allocate memory for bootconfig\n");
450 return;
451 }
452
453 memcpy(copy, data, size);
454 copy[size] = '\0';
455
456 ret = xbc_init(copy, &msg, &pos);
457 if (ret < 0) {
458 if (pos < 0)
459 pr_err("Failed to init bootconfig: %s.\n", msg);
460 else
461 pr_err("Failed to parse bootconfig: %s at %d.\n",
462 msg, pos);
463 } else {
464 pr_info("Load bootconfig: %d bytes %d nodes\n", size, ret);
465 /* keys starting with "kernel." are passed via cmdline */
466 extra_command_line = xbc_make_cmdline("kernel");
467 /* Also, "init." keys are init arguments */
468 extra_init_args = xbc_make_cmdline("init");
469 }
470 return;
471}
472
473#else
474
475static void __init setup_boot_config(void)
476{
477 /* Remove bootconfig data from initrd */
478 get_boot_config_from_initrd(NULL, NULL);
479}
480
481static int __init warn_bootconfig(char *str)
482{
483 pr_warn("WARNING: 'bootconfig' found on the kernel command line but CONFIG_BOOT_CONFIG is not set.\n");
484 return 0;
485}
486early_param("bootconfig", warn_bootconfig);
487
488#endif
489
490/* Change NUL term back to "=", to make "param" the whole string. */
491static void __init repair_env_string(char *param, char *val)
492{
493 if (val) {
494 /* param=val or param="val"? */
495 if (val == param+strlen(param)+1)
496 val[-1] = '=';
497 else if (val == param+strlen(param)+2) {
498 val[-2] = '=';
499 memmove(val-1, val, strlen(val)+1);
500 } else
501 BUG();
502 }
503}
504
505/* Anything after -- gets handed straight to init. */
506static int __init set_init_arg(char *param, char *val,
507 const char *unused, void *arg)
508{
509 unsigned int i;
510
511 if (panic_later)
512 return 0;
513
514 repair_env_string(param, val);
515
516 for (i = 0; argv_init[i]; i++) {
517 if (i == MAX_INIT_ARGS) {
518 panic_later = "init";
519 panic_param = param;
520 return 0;
521 }
522 }
523 argv_init[i] = param;
524 return 0;
525}
526
527/*
528 * Unknown boot options get handed to init, unless they look like
529 * unused parameters (modprobe will find them in /proc/cmdline).
530 */
531static int __init unknown_bootoption(char *param, char *val,
532 const char *unused, void *arg)
533{
534 size_t len = strlen(param);
535
536 repair_env_string(param, val);
537
538 /* Handle obsolete-style parameters */
539 if (obsolete_checksetup(param))
540 return 0;
541
542 /* Unused module parameter. */
543 if (strnchr(param, len, '.'))
544 return 0;
545
546 if (panic_later)
547 return 0;
548
549 if (val) {
550 /* Environment option */
551 unsigned int i;
552 for (i = 0; envp_init[i]; i++) {
553 if (i == MAX_INIT_ENVS) {
554 panic_later = "env";
555 panic_param = param;
556 }
557 if (!strncmp(param, envp_init[i], len+1))
558 break;
559 }
560 envp_init[i] = param;
561 } else {
562 /* Command line option */
563 unsigned int i;
564 for (i = 0; argv_init[i]; i++) {
565 if (i == MAX_INIT_ARGS) {
566 panic_later = "init";
567 panic_param = param;
568 }
569 }
570 argv_init[i] = param;
571 }
572 return 0;
573}
574
575static int __init init_setup(char *str)
576{
577 unsigned int i;
578
579 execute_command = str;
580 /*
581 * In case LILO is going to boot us with default command line,
582 * it prepends "auto" before the whole cmdline which makes
583 * the shell think it should execute a script with such name.
584 * So we ignore all arguments entered _before_ init=... [MJ]
585 */
586 for (i = 1; i < MAX_INIT_ARGS; i++)
587 argv_init[i] = NULL;
588 return 1;
589}
590__setup("init=", init_setup);
591
592static int __init rdinit_setup(char *str)
593{
594 unsigned int i;
595
596 ramdisk_execute_command = str;
597 /* See "auto" comment in init_setup */
598 for (i = 1; i < MAX_INIT_ARGS; i++)
599 argv_init[i] = NULL;
600 return 1;
601}
602__setup("rdinit=", rdinit_setup);
603
604#ifndef CONFIG_SMP
605static const unsigned int setup_max_cpus = NR_CPUS;
606static inline void setup_nr_cpu_ids(void) { }
607static inline void smp_prepare_cpus(unsigned int maxcpus) { }
608#endif
609
610/*
611 * We need to store the untouched command line for future reference.
612 * We also need to store the touched command line since the parameter
613 * parsing is performed in place, and we should allow a component to
614 * store reference of name/value for future reference.
615 */
616static void __init setup_command_line(char *command_line)
617{
618 size_t len, xlen = 0, ilen = 0;
619
620 if (extra_command_line)
621 xlen = strlen(extra_command_line);
622 if (extra_init_args)
623 ilen = strlen(extra_init_args) + 4; /* for " -- " */
624
625 len = xlen + strlen(boot_command_line) + 1;
626
627 saved_command_line = memblock_alloc(len + ilen, SMP_CACHE_BYTES);
628 if (!saved_command_line)
629 panic("%s: Failed to allocate %zu bytes\n", __func__, len + ilen);
630
631 static_command_line = memblock_alloc(len, SMP_CACHE_BYTES);
632 if (!static_command_line)
633 panic("%s: Failed to allocate %zu bytes\n", __func__, len);
634
635 if (xlen) {
636 /*
637 * We have to put extra_command_line before boot command
638 * lines because there could be dashes (separator of init
639 * command line) in the command lines.
640 */
641 strcpy(saved_command_line, extra_command_line);
642 strcpy(static_command_line, extra_command_line);
643 }
644 strcpy(saved_command_line + xlen, boot_command_line);
645 strcpy(static_command_line + xlen, command_line);
646
647 if (ilen) {
648 /*
649 * Append supplemental init boot args to saved_command_line
650 * so that user can check what command line options passed
651 * to init.
652 */
653 len = strlen(saved_command_line);
654 if (initargs_found) {
655 saved_command_line[len++] = ' ';
656 } else {
657 strcpy(saved_command_line + len, " -- ");
658 len += 4;
659 }
660
661 strcpy(saved_command_line + len, extra_init_args);
662 }
663}
664
665/*
666 * We need to finalize in a non-__init function or else race conditions
667 * between the root thread and the init thread may cause start_kernel to
668 * be reaped by free_initmem before the root thread has proceeded to
669 * cpu_idle.
670 *
671 * gcc-3.4 accidentally inlines this function, so use noinline.
672 */
673
674static __initdata DECLARE_COMPLETION(kthreadd_done);
675
676noinline void __ref rest_init(void)
677{
678 struct task_struct *tsk;
679 int pid;
680
681 rcu_scheduler_starting();
682 /*
683 * We need to spawn init first so that it obtains pid 1, however
684 * the init task will end up wanting to create kthreads, which, if
685 * we schedule it before we create kthreadd, will OOPS.
686 */
687 pid = kernel_thread(kernel_init, NULL, CLONE_FS);
688 /*
689 * Pin init on the boot CPU. Task migration is not properly working
690 * until sched_init_smp() has been run. It will set the allowed
691 * CPUs for init to the non isolated CPUs.
692 */
693 rcu_read_lock();
694 tsk = find_task_by_pid_ns(pid, &init_pid_ns);
695 set_cpus_allowed_ptr(tsk, cpumask_of(smp_processor_id()));
696 rcu_read_unlock();
697
698 numa_default_policy();
699 pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES);
700 rcu_read_lock();
701 kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns);
702 rcu_read_unlock();
703
704 /*
705 * Enable might_sleep() and smp_processor_id() checks.
706 * They cannot be enabled earlier because with CONFIG_PREEMPTION=y
707 * kernel_thread() would trigger might_sleep() splats. With
708 * CONFIG_PREEMPT_VOLUNTARY=y the init task might have scheduled
709 * already, but it's stuck on the kthreadd_done completion.
710 */
711 system_state = SYSTEM_SCHEDULING;
712
713 complete(&kthreadd_done);
714
715 /*
716 * The boot idle thread must execute schedule()
717 * at least once to get things moving:
718 */
719 schedule_preempt_disabled();
720 /* Call into cpu_idle with preempt disabled */
721 cpu_startup_entry(CPUHP_ONLINE);
722}
723
724/* Check for early params. */
725static int __init do_early_param(char *param, char *val,
726 const char *unused, void *arg)
727{
728 const struct obs_kernel_param *p;
729
730 for (p = __setup_start; p < __setup_end; p++) {
731 if ((p->early && parameq(param, p->str)) ||
732 (strcmp(param, "console") == 0 &&
733 strcmp(p->str, "earlycon") == 0)
734 ) {
735 if (p->setup_func(val) != 0)
736 pr_warn("Malformed early option '%s'\n", param);
737 }
738 }
739 /* We accept everything at this stage. */
740 return 0;
741}
742
743void __init parse_early_options(char *cmdline)
744{
745 parse_args("early options", cmdline, NULL, 0, 0, 0, NULL,
746 do_early_param);
747}
748
749/* Arch code calls this early on, or if not, just before other parsing. */
750void __init parse_early_param(void)
751{
752 static int done __initdata;
753 static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata;
754
755 if (done)
756 return;
757
758 /* All fall through to do_early_param. */
759 strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
760 parse_early_options(tmp_cmdline);
761 done = 1;
762}
763
764void __init __weak arch_post_acpi_subsys_init(void) { }
765
766void __init __weak smp_setup_processor_id(void)
767{
768}
769
770# if THREAD_SIZE >= PAGE_SIZE
771void __init __weak thread_stack_cache_init(void)
772{
773}
774#endif
775
776void __init __weak mem_encrypt_init(void) { }
777
778void __init __weak poking_init(void) { }
779
780void __init __weak pgtable_cache_init(void) { }
781
782bool initcall_debug;
783core_param(initcall_debug, initcall_debug, bool, 0644);
784
785#ifdef TRACEPOINTS_ENABLED
786static void __init initcall_debug_enable(void);
787#else
788static inline void initcall_debug_enable(void)
789{
790}
791#endif
792
793/* Report memory auto-initialization states for this boot. */
794static void __init report_meminit(void)
795{
796 const char *stack;
797
798 if (IS_ENABLED(CONFIG_INIT_STACK_ALL_PATTERN))
799 stack = "all(pattern)";
800 else if (IS_ENABLED(CONFIG_INIT_STACK_ALL_ZERO))
801 stack = "all(zero)";
802 else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL))
803 stack = "byref_all(zero)";
804 else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF))
805 stack = "byref(zero)";
806 else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_USER))
807 stack = "__user(zero)";
808 else
809 stack = "off";
810
811 pr_info("mem auto-init: stack:%s, heap alloc:%s, heap free:%s\n",
812 stack, want_init_on_alloc(GFP_KERNEL) ? "on" : "off",
813 want_init_on_free() ? "on" : "off");
814 if (want_init_on_free())
815 pr_info("mem auto-init: clearing system memory may take some time...\n");
816}
817
818/*
819 * Set up kernel memory allocators
820 */
821static void __init mm_init(void)
822{
823 /*
824 * page_ext requires contiguous pages,
825 * bigger than MAX_ORDER unless SPARSEMEM.
826 */
827 page_ext_init_flatmem();
828 init_mem_debugging_and_hardening();
829 kfence_alloc_pool();
830 report_meminit();
831 stack_depot_init();
832 mem_init();
833 mem_init_print_info();
834 /* page_owner must be initialized after buddy is ready */
835 page_ext_init_flatmem_late();
836 kmem_cache_init();
837 kmemleak_init();
838 pgtable_init();
839 debug_objects_mem_init();
840 vmalloc_init();
841 /* Should be run before the first non-init thread is created */
842 init_espfix_bsp();
843 /* Should be run after espfix64 is set up. */
844 pti_init();
845}
846
847#ifdef CONFIG_HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
848DEFINE_STATIC_KEY_MAYBE_RO(CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT,
849 randomize_kstack_offset);
850DEFINE_PER_CPU(u32, kstack_offset);
851
852static int __init early_randomize_kstack_offset(char *buf)
853{
854 int ret;
855 bool bool_result;
856
857 ret = kstrtobool(buf, &bool_result);
858 if (ret)
859 return ret;
860
861 if (bool_result)
862 static_branch_enable(&randomize_kstack_offset);
863 else
864 static_branch_disable(&randomize_kstack_offset);
865 return 0;
866}
867early_param("randomize_kstack_offset", early_randomize_kstack_offset);
868#endif
869
870void __init __weak arch_call_rest_init(void)
871{
872 rest_init();
873}
874
875asmlinkage __visible void __init __no_sanitize_address start_kernel(void)
876{
877 char *command_line;
878 char *after_dashes;
879
880 set_task_stack_end_magic(&init_task);
881 smp_setup_processor_id();
882 debug_objects_early_init();
883
884 cgroup_init_early();
885
886 local_irq_disable();
887 early_boot_irqs_disabled = true;
888
889 /*
890 * Interrupts are still disabled. Do necessary setups, then
891 * enable them.
892 */
893 boot_cpu_init();
894 page_address_init();
895 pr_notice("%s", linux_banner);
896 early_security_init();
897 setup_arch(&command_line);
898 setup_boot_config();
899 setup_command_line(command_line);
900 setup_nr_cpu_ids();
901 setup_per_cpu_areas();
902 smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */
903 boot_cpu_hotplug_init();
904
905 build_all_zonelists(NULL);
906 page_alloc_init();
907
908 pr_notice("Kernel command line: %s\n", saved_command_line);
909 /* parameters may set static keys */
910 jump_label_init();
911 parse_early_param();
912 after_dashes = parse_args("Booting kernel",
913 static_command_line, __start___param,
914 __stop___param - __start___param,
915 -1, -1, NULL, &unknown_bootoption);
916 if (!IS_ERR_OR_NULL(after_dashes))
917 parse_args("Setting init args", after_dashes, NULL, 0, -1, -1,
918 NULL, set_init_arg);
919 if (extra_init_args)
920 parse_args("Setting extra init args", extra_init_args,
921 NULL, 0, -1, -1, NULL, set_init_arg);
922
923 /*
924 * These use large bootmem allocations and must precede
925 * kmem_cache_init()
926 */
927 setup_log_buf(0);
928 vfs_caches_init_early();
929 sort_main_extable();
930 trap_init();
931 mm_init();
932
933 ftrace_init();
934
935 /* trace_printk can be enabled here */
936 early_trace_init();
937
938 /*
939 * Set up the scheduler prior starting any interrupts (such as the
940 * timer interrupt). Full topology setup happens at smp_init()
941 * time - but meanwhile we still have a functioning scheduler.
942 */
943 sched_init();
944 /*
945 * Disable preemption - early bootup scheduling is extremely
946 * fragile until we cpu_idle() for the first time.
947 */
948 preempt_disable();
949 if (WARN(!irqs_disabled(),
950 "Interrupts were enabled *very* early, fixing it\n"))
951 local_irq_disable();
952 radix_tree_init();
953
954 /*
955 * Set up housekeeping before setting up workqueues to allow the unbound
956 * workqueue to take non-housekeeping into account.
957 */
958 housekeeping_init();
959
960 /*
961 * Allow workqueue creation and work item queueing/cancelling
962 * early. Work item execution depends on kthreads and starts after
963 * workqueue_init().
964 */
965 workqueue_init_early();
966
967 rcu_init();
968
969 /* Trace events are available after this */
970 trace_init();
971
972 if (initcall_debug)
973 initcall_debug_enable();
974
975 context_tracking_init();
976 /* init some links before init_ISA_irqs() */
977 early_irq_init();
978 init_IRQ();
979 tick_init();
980 rcu_init_nohz();
981 init_timers();
982 hrtimers_init();
983 softirq_init();
984 timekeeping_init();
985 kfence_init();
986
987 /*
988 * For best initial stack canary entropy, prepare it after:
989 * - setup_arch() for any UEFI RNG entropy and boot cmdline access
990 * - timekeeping_init() for ktime entropy used in rand_initialize()
991 * - rand_initialize() to get any arch-specific entropy like RDRAND
992 * - add_latent_entropy() to get any latent entropy
993 * - adding command line entropy
994 */
995 rand_initialize();
996 add_latent_entropy();
997 add_device_randomness(command_line, strlen(command_line));
998 boot_init_stack_canary();
999
1000 time_init();
1001 perf_event_init();
1002 profile_init();
1003 call_function_init();
1004 WARN(!irqs_disabled(), "Interrupts were enabled early\n");
1005
1006 early_boot_irqs_disabled = false;
1007 local_irq_enable();
1008
1009 kmem_cache_init_late();
1010
1011 /*
1012 * HACK ALERT! This is early. We're enabling the console before
1013 * we've done PCI setups etc, and console_init() must be aware of
1014 * this. But we do want output early, in case something goes wrong.
1015 */
1016 console_init();
1017 if (panic_later)
1018 panic("Too many boot %s vars at `%s'", panic_later,
1019 panic_param);
1020
1021 lockdep_init();
1022
1023 /*
1024 * Need to run this when irqs are enabled, because it wants
1025 * to self-test [hard/soft]-irqs on/off lock inversion bugs
1026 * too:
1027 */
1028 locking_selftest();
1029
1030 /*
1031 * This needs to be called before any devices perform DMA
1032 * operations that might use the SWIOTLB bounce buffers. It will
1033 * mark the bounce buffers as decrypted so that their usage will
1034 * not cause "plain-text" data to be decrypted when accessed.
1035 */
1036 mem_encrypt_init();
1037
1038#ifdef CONFIG_BLK_DEV_INITRD
1039 if (initrd_start && !initrd_below_start_ok &&
1040 page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) {
1041 pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n",
1042 page_to_pfn(virt_to_page((void *)initrd_start)),
1043 min_low_pfn);
1044 initrd_start = 0;
1045 }
1046#endif
1047 setup_per_cpu_pageset();
1048 numa_policy_init();
1049 acpi_early_init();
1050 if (late_time_init)
1051 late_time_init();
1052 sched_clock_init();
1053 calibrate_delay();
1054 pid_idr_init();
1055 anon_vma_init();
1056#ifdef CONFIG_X86
1057 if (efi_enabled(EFI_RUNTIME_SERVICES))
1058 efi_enter_virtual_mode();
1059#endif
1060 thread_stack_cache_init();
1061 cred_init();
1062 fork_init();
1063 proc_caches_init();
1064 uts_ns_init();
1065 key_init();
1066 security_init();
1067 dbg_late_init();
1068 vfs_caches_init();
1069 pagecache_init();
1070 signals_init();
1071 seq_file_init();
1072 proc_root_init();
1073 nsfs_init();
1074 cpuset_init();
1075 cgroup_init();
1076 taskstats_init_early();
1077 delayacct_init();
1078
1079 poking_init();
1080 check_bugs();
1081
1082 acpi_subsystem_init();
1083 arch_post_acpi_subsys_init();
1084 kcsan_init();
1085
1086 /* Do the rest non-__init'ed, we're now alive */
1087 arch_call_rest_init();
1088
1089 prevent_tail_call_optimization();
1090}
1091
1092/* Call all constructor functions linked into the kernel. */
1093static void __init do_ctors(void)
1094{
1095/*
1096 * For UML, the constructors have already been called by the
1097 * normal setup code as it's just a normal ELF binary, so we
1098 * cannot do it again - but we do need CONFIG_CONSTRUCTORS
1099 * even on UML for modules.
1100 */
1101#if defined(CONFIG_CONSTRUCTORS) && !defined(CONFIG_UML)
1102 ctor_fn_t *fn = (ctor_fn_t *) __ctors_start;
1103
1104 for (; fn < (ctor_fn_t *) __ctors_end; fn++)
1105 (*fn)();
1106#endif
1107}
1108
1109#ifdef CONFIG_KALLSYMS
1110struct blacklist_entry {
1111 struct list_head next;
1112 char *buf;
1113};
1114
1115static __initdata_or_module LIST_HEAD(blacklisted_initcalls);
1116
1117static int __init initcall_blacklist(char *str)
1118{
1119 char *str_entry;
1120 struct blacklist_entry *entry;
1121
1122 /* str argument is a comma-separated list of functions */
1123 do {
1124 str_entry = strsep(&str, ",");
1125 if (str_entry) {
1126 pr_debug("blacklisting initcall %s\n", str_entry);
1127 entry = memblock_alloc(sizeof(*entry),
1128 SMP_CACHE_BYTES);
1129 if (!entry)
1130 panic("%s: Failed to allocate %zu bytes\n",
1131 __func__, sizeof(*entry));
1132 entry->buf = memblock_alloc(strlen(str_entry) + 1,
1133 SMP_CACHE_BYTES);
1134 if (!entry->buf)
1135 panic("%s: Failed to allocate %zu bytes\n",
1136 __func__, strlen(str_entry) + 1);
1137 strcpy(entry->buf, str_entry);
1138 list_add(&entry->next, &blacklisted_initcalls);
1139 }
1140 } while (str_entry);
1141
1142 return 0;
1143}
1144
1145static bool __init_or_module initcall_blacklisted(initcall_t fn)
1146{
1147 struct blacklist_entry *entry;
1148 char fn_name[KSYM_SYMBOL_LEN];
1149 unsigned long addr;
1150
1151 if (list_empty(&blacklisted_initcalls))
1152 return false;
1153
1154 addr = (unsigned long) dereference_function_descriptor(fn);
1155 sprint_symbol_no_offset(fn_name, addr);
1156
1157 /*
1158 * fn will be "function_name [module_name]" where [module_name] is not
1159 * displayed for built-in init functions. Strip off the [module_name].
1160 */
1161 strreplace(fn_name, ' ', '\0');
1162
1163 list_for_each_entry(entry, &blacklisted_initcalls, next) {
1164 if (!strcmp(fn_name, entry->buf)) {
1165 pr_debug("initcall %s blacklisted\n", fn_name);
1166 return true;
1167 }
1168 }
1169
1170 return false;
1171}
1172#else
1173static int __init initcall_blacklist(char *str)
1174{
1175 pr_warn("initcall_blacklist requires CONFIG_KALLSYMS\n");
1176 return 0;
1177}
1178
1179static bool __init_or_module initcall_blacklisted(initcall_t fn)
1180{
1181 return false;
1182}
1183#endif
1184__setup("initcall_blacklist=", initcall_blacklist);
1185
1186static __init_or_module void
1187trace_initcall_start_cb(void *data, initcall_t fn)
1188{
1189 ktime_t *calltime = (ktime_t *)data;
1190
1191 printk(KERN_DEBUG "calling %pS @ %i\n", fn, task_pid_nr(current));
1192 *calltime = ktime_get();
1193}
1194
1195static __init_or_module void
1196trace_initcall_finish_cb(void *data, initcall_t fn, int ret)
1197{
1198 ktime_t *calltime = (ktime_t *)data;
1199 ktime_t delta, rettime;
1200 unsigned long long duration;
1201
1202 rettime = ktime_get();
1203 delta = ktime_sub(rettime, *calltime);
1204 duration = (unsigned long long) ktime_to_ns(delta) >> 10;
1205 printk(KERN_DEBUG "initcall %pS returned %d after %lld usecs\n",
1206 fn, ret, duration);
1207}
1208
1209static ktime_t initcall_calltime;
1210
1211#ifdef TRACEPOINTS_ENABLED
1212static void __init initcall_debug_enable(void)
1213{
1214 int ret;
1215
1216 ret = register_trace_initcall_start(trace_initcall_start_cb,
1217 &initcall_calltime);
1218 ret |= register_trace_initcall_finish(trace_initcall_finish_cb,
1219 &initcall_calltime);
1220 WARN(ret, "Failed to register initcall tracepoints\n");
1221}
1222# define do_trace_initcall_start trace_initcall_start
1223# define do_trace_initcall_finish trace_initcall_finish
1224#else
1225static inline void do_trace_initcall_start(initcall_t fn)
1226{
1227 if (!initcall_debug)
1228 return;
1229 trace_initcall_start_cb(&initcall_calltime, fn);
1230}
1231static inline void do_trace_initcall_finish(initcall_t fn, int ret)
1232{
1233 if (!initcall_debug)
1234 return;
1235 trace_initcall_finish_cb(&initcall_calltime, fn, ret);
1236}
1237#endif /* !TRACEPOINTS_ENABLED */
1238
1239int __init_or_module do_one_initcall(initcall_t fn)
1240{
1241 int count = preempt_count();
1242 char msgbuf[64];
1243 int ret;
1244
1245 if (initcall_blacklisted(fn))
1246 return -EPERM;
1247
1248 do_trace_initcall_start(fn);
1249 ret = fn();
1250 do_trace_initcall_finish(fn, ret);
1251
1252 msgbuf[0] = 0;
1253
1254 if (preempt_count() != count) {
1255 sprintf(msgbuf, "preemption imbalance ");
1256 preempt_count_set(count);
1257 }
1258 if (irqs_disabled()) {
1259 strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf));
1260 local_irq_enable();
1261 }
1262 WARN(msgbuf[0], "initcall %pS returned with %s\n", fn, msgbuf);
1263
1264 add_latent_entropy();
1265 return ret;
1266}
1267
1268
1269extern initcall_entry_t __initcall_start[];
1270extern initcall_entry_t __initcall0_start[];
1271extern initcall_entry_t __initcall1_start[];
1272extern initcall_entry_t __initcall2_start[];
1273extern initcall_entry_t __initcall3_start[];
1274extern initcall_entry_t __initcall4_start[];
1275extern initcall_entry_t __initcall5_start[];
1276extern initcall_entry_t __initcall6_start[];
1277extern initcall_entry_t __initcall7_start[];
1278extern initcall_entry_t __initcall_end[];
1279
1280static initcall_entry_t *initcall_levels[] __initdata = {
1281 __initcall0_start,
1282 __initcall1_start,
1283 __initcall2_start,
1284 __initcall3_start,
1285 __initcall4_start,
1286 __initcall5_start,
1287 __initcall6_start,
1288 __initcall7_start,
1289 __initcall_end,
1290};
1291
1292/* Keep these in sync with initcalls in include/linux/init.h */
1293static const char *initcall_level_names[] __initdata = {
1294 "pure",
1295 "core",
1296 "postcore",
1297 "arch",
1298 "subsys",
1299 "fs",
1300 "device",
1301 "late",
1302};
1303
1304static int __init ignore_unknown_bootoption(char *param, char *val,
1305 const char *unused, void *arg)
1306{
1307 return 0;
1308}
1309
1310static void __init do_initcall_level(int level, char *command_line)
1311{
1312 initcall_entry_t *fn;
1313
1314 parse_args(initcall_level_names[level],
1315 command_line, __start___param,
1316 __stop___param - __start___param,
1317 level, level,
1318 NULL, ignore_unknown_bootoption);
1319
1320 trace_initcall_level(initcall_level_names[level]);
1321 for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++)
1322 do_one_initcall(initcall_from_entry(fn));
1323}
1324
1325static void __init do_initcalls(void)
1326{
1327 int level;
1328 size_t len = strlen(saved_command_line) + 1;
1329 char *command_line;
1330
1331 command_line = kzalloc(len, GFP_KERNEL);
1332 if (!command_line)
1333 panic("%s: Failed to allocate %zu bytes\n", __func__, len);
1334
1335 for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) {
1336 /* Parser modifies command_line, restore it each time */
1337 strcpy(command_line, saved_command_line);
1338 do_initcall_level(level, command_line);
1339 }
1340
1341 kfree(command_line);
1342}
1343
1344/*
1345 * Ok, the machine is now initialized. None of the devices
1346 * have been touched yet, but the CPU subsystem is up and
1347 * running, and memory and process management works.
1348 *
1349 * Now we can finally start doing some real work..
1350 */
1351static void __init do_basic_setup(void)
1352{
1353 cpuset_init_smp();
1354 driver_init();
1355 init_irq_proc();
1356 do_ctors();
1357 usermodehelper_enable();
1358 do_initcalls();
1359}
1360
1361static void __init do_pre_smp_initcalls(void)
1362{
1363 initcall_entry_t *fn;
1364
1365 trace_initcall_level("early");
1366 for (fn = __initcall_start; fn < __initcall0_start; fn++)
1367 do_one_initcall(initcall_from_entry(fn));
1368}
1369
1370static int run_init_process(const char *init_filename)
1371{
1372 const char *const *p;
1373
1374 argv_init[0] = init_filename;
1375 pr_info("Run %s as init process\n", init_filename);
1376 pr_debug(" with arguments:\n");
1377 for (p = argv_init; *p; p++)
1378 pr_debug(" %s\n", *p);
1379 pr_debug(" with environment:\n");
1380 for (p = envp_init; *p; p++)
1381 pr_debug(" %s\n", *p);
1382 return kernel_execve(init_filename, argv_init, envp_init);
1383}
1384
1385static int try_to_run_init_process(const char *init_filename)
1386{
1387 int ret;
1388
1389 ret = run_init_process(init_filename);
1390
1391 if (ret && ret != -ENOENT) {
1392 pr_err("Starting init: %s exists but couldn't execute it (error %d)\n",
1393 init_filename, ret);
1394 }
1395
1396 return ret;
1397}
1398
1399static noinline void __init kernel_init_freeable(void);
1400
1401#if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX)
1402bool rodata_enabled __ro_after_init = true;
1403static int __init set_debug_rodata(char *str)
1404{
1405 return strtobool(str, &rodata_enabled);
1406}
1407__setup("rodata=", set_debug_rodata);
1408#endif
1409
1410#ifdef CONFIG_STRICT_KERNEL_RWX
1411static void mark_readonly(void)
1412{
1413 if (rodata_enabled) {
1414 /*
1415 * load_module() results in W+X mappings, which are cleaned
1416 * up with call_rcu(). Let's make sure that queued work is
1417 * flushed so that we don't hit false positives looking for
1418 * insecure pages which are W+X.
1419 */
1420 rcu_barrier();
1421 mark_rodata_ro();
1422 rodata_test();
1423 } else
1424 pr_info("Kernel memory protection disabled.\n");
1425}
1426#elif defined(CONFIG_ARCH_HAS_STRICT_KERNEL_RWX)
1427static inline void mark_readonly(void)
1428{
1429 pr_warn("Kernel memory protection not selected by kernel config.\n");
1430}
1431#else
1432static inline void mark_readonly(void)
1433{
1434 pr_warn("This architecture does not have kernel memory protection.\n");
1435}
1436#endif
1437
1438void __weak free_initmem(void)
1439{
1440 free_initmem_default(POISON_FREE_INITMEM);
1441}
1442
1443static int __ref kernel_init(void *unused)
1444{
1445 int ret;
1446
1447 kernel_init_freeable();
1448 /* need to finish all async __init code before freeing the memory */
1449 async_synchronize_full();
1450 kprobe_free_init_mem();
1451 ftrace_free_init_mem();
1452 kgdb_free_init_mem();
1453 free_initmem();
1454 mark_readonly();
1455
1456 /*
1457 * Kernel mappings are now finalized - update the userspace page-table
1458 * to finalize PTI.
1459 */
1460 pti_finalize();
1461
1462 system_state = SYSTEM_RUNNING;
1463 numa_default_policy();
1464
1465 rcu_end_inkernel_boot();
1466
1467 do_sysctl_args();
1468
1469 if (ramdisk_execute_command) {
1470 ret = run_init_process(ramdisk_execute_command);
1471 if (!ret)
1472 return 0;
1473 pr_err("Failed to execute %s (error %d)\n",
1474 ramdisk_execute_command, ret);
1475 }
1476
1477 /*
1478 * We try each of these until one succeeds.
1479 *
1480 * The Bourne shell can be used instead of init if we are
1481 * trying to recover a really broken machine.
1482 */
1483 if (execute_command) {
1484 ret = run_init_process(execute_command);
1485 if (!ret)
1486 return 0;
1487 panic("Requested init %s failed (error %d).",
1488 execute_command, ret);
1489 }
1490
1491 if (CONFIG_DEFAULT_INIT[0] != '\0') {
1492 ret = run_init_process(CONFIG_DEFAULT_INIT);
1493 if (ret)
1494 pr_err("Default init %s failed (error %d)\n",
1495 CONFIG_DEFAULT_INIT, ret);
1496 else
1497 return 0;
1498 }
1499
1500 if (!try_to_run_init_process("/sbin/init") ||
1501 !try_to_run_init_process("/etc/init") ||
1502 !try_to_run_init_process("/bin/init") ||
1503 !try_to_run_init_process("/bin/sh"))
1504 return 0;
1505
1506 panic("No working init found. Try passing init= option to kernel. "
1507 "See Linux Documentation/admin-guide/init.rst for guidance.");
1508}
1509
1510/* Open /dev/console, for stdin/stdout/stderr, this should never fail */
1511void __init console_on_rootfs(void)
1512{
1513 struct file *file = filp_open("/dev/console", O_RDWR, 0);
1514
1515 if (IS_ERR(file)) {
1516 pr_err("Warning: unable to open an initial console.\n");
1517 return;
1518 }
1519 init_dup(file);
1520 init_dup(file);
1521 init_dup(file);
1522 fput(file);
1523}
1524
1525static noinline void __init kernel_init_freeable(void)
1526{
1527 /*
1528 * Wait until kthreadd is all set-up.
1529 */
1530 wait_for_completion(&kthreadd_done);
1531
1532 /* Now the scheduler is fully set up and can do blocking allocations */
1533 gfp_allowed_mask = __GFP_BITS_MASK;
1534
1535 /*
1536 * init can allocate pages on any node
1537 */
1538 set_mems_allowed(node_states[N_MEMORY]);
1539
1540 cad_pid = get_pid(task_pid(current));
1541
1542 smp_prepare_cpus(setup_max_cpus);
1543
1544 workqueue_init();
1545
1546 init_mm_internals();
1547
1548 rcu_init_tasks_generic();
1549 do_pre_smp_initcalls();
1550 lockup_detector_init();
1551
1552 smp_init();
1553 sched_init_smp();
1554
1555 padata_init();
1556 page_alloc_init_late();
1557 /* Initialize page ext after all struct pages are initialized. */
1558 page_ext_init();
1559
1560 do_basic_setup();
1561
1562 kunit_run_all_tests();
1563
1564 wait_for_initramfs();
1565 console_on_rootfs();
1566
1567 /*
1568 * check if there is an early userspace init. If yes, let it do all
1569 * the work
1570 */
1571 if (init_eaccess(ramdisk_execute_command) != 0) {
1572 ramdisk_execute_command = NULL;
1573 prepare_namespace();
1574 }
1575
1576 /*
1577 * Ok, we have completed the initial bootup, and
1578 * we're essentially up and running. Get rid of the
1579 * initmem segments and start the user-mode stuff..
1580 *
1581 * rootfs is available now, try loading the public keys
1582 * and default modules
1583 */
1584
1585 integrity_load_keys();
1586}