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12
13#define 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/console.h>
32#include <linux/nmi.h>
33#include <linux/percpu.h>
34#include <linux/kmod.h>
35#include <linux/vmalloc.h>
36#include <linux/kernel_stat.h>
37#include <linux/start_kernel.h>
38#include <linux/security.h>
39#include <linux/smp.h>
40#include <linux/profile.h>
41#include <linux/rcupdate.h>
42#include <linux/moduleparam.h>
43#include <linux/kallsyms.h>
44#include <linux/writeback.h>
45#include <linux/cpu.h>
46#include <linux/cpuset.h>
47#include <linux/cgroup.h>
48#include <linux/efi.h>
49#include <linux/tick.h>
50#include <linux/sched/isolation.h>
51#include <linux/interrupt.h>
52#include <linux/taskstats_kern.h>
53#include <linux/delayacct.h>
54#include <linux/unistd.h>
55#include <linux/utsname.h>
56#include <linux/rmap.h>
57#include <linux/mempolicy.h>
58#include <linux/key.h>
59#include <linux/buffer_head.h>
60#include <linux/page_ext.h>
61#include <linux/debug_locks.h>
62#include <linux/debugobjects.h>
63#include <linux/lockdep.h>
64#include <linux/kmemleak.h>
65#include <linux/pid_namespace.h>
66#include <linux/device.h>
67#include <linux/kthread.h>
68#include <linux/sched.h>
69#include <linux/sched/init.h>
70#include <linux/signal.h>
71#include <linux/idr.h>
72#include <linux/kgdb.h>
73#include <linux/ftrace.h>
74#include <linux/async.h>
75#include <linux/sfi.h>
76#include <linux/shmem_fs.h>
77#include <linux/slab.h>
78#include <linux/perf_event.h>
79#include <linux/ptrace.h>
80#include <linux/pti.h>
81#include <linux/blkdev.h>
82#include <linux/elevator.h>
83#include <linux/sched/clock.h>
84#include <linux/sched/task.h>
85#include <linux/sched/task_stack.h>
86#include <linux/context_tracking.h>
87#include <linux/random.h>
88#include <linux/list.h>
89#include <linux/integrity.h>
90#include <linux/proc_ns.h>
91#include <linux/io.h>
92#include <linux/cache.h>
93#include <linux/rodata_test.h>
94#include <linux/jump_label.h>
95#include <linux/mem_encrypt.h>
96
97#include <asm/io.h>
98#include <asm/bugs.h>
99#include <asm/setup.h>
100#include <asm/sections.h>
101#include <asm/cacheflush.h>
102
103#define CREATE_TRACE_POINTS
104#include <trace/events/initcall.h>
105
106static int kernel_init(void *);
107
108extern void init_IRQ(void);
109extern void radix_tree_init(void);
110
111
112
113
114
115
116
117
118bool early_boot_irqs_disabled __read_mostly;
119
120enum system_states system_state __read_mostly;
121EXPORT_SYMBOL(system_state);
122
123
124
125
126#define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT
127#define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT
128
129extern void time_init(void);
130
131void (*__initdata late_time_init)(void);
132
133
134char __initdata boot_command_line[COMMAND_LINE_SIZE];
135
136char *saved_command_line;
137
138static char *static_command_line;
139
140static char *initcall_command_line;
141
142static char *execute_command;
143static char *ramdisk_execute_command;
144
145
146
147
148
149bool static_key_initialized __read_mostly;
150EXPORT_SYMBOL_GPL(static_key_initialized);
151
152
153
154
155
156
157
158
159
160
161unsigned int reset_devices;
162EXPORT_SYMBOL(reset_devices);
163
164static int __init set_reset_devices(char *str)
165{
166 reset_devices = 1;
167 return 1;
168}
169
170__setup("reset_devices", set_reset_devices);
171
172static const char *argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };
173const char *envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, };
174static const char *panic_later, *panic_param;
175
176extern const struct obs_kernel_param __setup_start[], __setup_end[];
177
178static bool __init obsolete_checksetup(char *line)
179{
180 const struct obs_kernel_param *p;
181 bool had_early_param = false;
182
183 p = __setup_start;
184 do {
185 int n = strlen(p->str);
186 if (parameqn(line, p->str, n)) {
187 if (p->early) {
188
189
190
191
192 if (line[n] == '\0' || line[n] == '=')
193 had_early_param = true;
194 } else if (!p->setup_func) {
195 pr_warn("Parameter %s is obsolete, ignored\n",
196 p->str);
197 return true;
198 } else if (p->setup_func(line + n))
199 return true;
200 }
201 p++;
202 } while (p < __setup_end);
203
204 return had_early_param;
205}
206
207
208
209
210
211unsigned long loops_per_jiffy = (1<<12);
212EXPORT_SYMBOL(loops_per_jiffy);
213
214static int __init debug_kernel(char *str)
215{
216 console_loglevel = CONSOLE_LOGLEVEL_DEBUG;
217 return 0;
218}
219
220static int __init quiet_kernel(char *str)
221{
222 console_loglevel = CONSOLE_LOGLEVEL_QUIET;
223 return 0;
224}
225
226early_param("debug", debug_kernel);
227early_param("quiet", quiet_kernel);
228
229static int __init loglevel(char *str)
230{
231 int newlevel;
232
233
234
235
236
237
238 if (get_option(&str, &newlevel)) {
239 console_loglevel = newlevel;
240 return 0;
241 }
242
243 return -EINVAL;
244}
245
246early_param("loglevel", loglevel);
247
248
249static int __init repair_env_string(char *param, char *val,
250 const char *unused, void *arg)
251{
252 if (val) {
253
254 if (val == param+strlen(param)+1)
255 val[-1] = '=';
256 else if (val == param+strlen(param)+2) {
257 val[-2] = '=';
258 memmove(val-1, val, strlen(val)+1);
259 val--;
260 } else
261 BUG();
262 }
263 return 0;
264}
265
266
267static int __init set_init_arg(char *param, char *val,
268 const char *unused, void *arg)
269{
270 unsigned int i;
271
272 if (panic_later)
273 return 0;
274
275 repair_env_string(param, val, unused, NULL);
276
277 for (i = 0; argv_init[i]; i++) {
278 if (i == MAX_INIT_ARGS) {
279 panic_later = "init";
280 panic_param = param;
281 return 0;
282 }
283 }
284 argv_init[i] = param;
285 return 0;
286}
287
288
289
290
291
292static int __init unknown_bootoption(char *param, char *val,
293 const char *unused, void *arg)
294{
295 repair_env_string(param, val, unused, NULL);
296
297
298 if (obsolete_checksetup(param))
299 return 0;
300
301
302 if (strchr(param, '.') && (!val || strchr(param, '.') < val))
303 return 0;
304
305 if (panic_later)
306 return 0;
307
308 if (val) {
309
310 unsigned int i;
311 for (i = 0; envp_init[i]; i++) {
312 if (i == MAX_INIT_ENVS) {
313 panic_later = "env";
314 panic_param = param;
315 }
316 if (!strncmp(param, envp_init[i], val - param))
317 break;
318 }
319 envp_init[i] = param;
320 } else {
321
322 unsigned int i;
323 for (i = 0; argv_init[i]; i++) {
324 if (i == MAX_INIT_ARGS) {
325 panic_later = "init";
326 panic_param = param;
327 }
328 }
329 argv_init[i] = param;
330 }
331 return 0;
332}
333
334static int __init init_setup(char *str)
335{
336 unsigned int i;
337
338 execute_command = str;
339
340
341
342
343
344
345 for (i = 1; i < MAX_INIT_ARGS; i++)
346 argv_init[i] = NULL;
347 return 1;
348}
349__setup("init=", init_setup);
350
351static int __init rdinit_setup(char *str)
352{
353 unsigned int i;
354
355 ramdisk_execute_command = str;
356
357 for (i = 1; i < MAX_INIT_ARGS; i++)
358 argv_init[i] = NULL;
359 return 1;
360}
361__setup("rdinit=", rdinit_setup);
362
363#ifndef CONFIG_SMP
364static const unsigned int setup_max_cpus = NR_CPUS;
365static inline void setup_nr_cpu_ids(void) { }
366static inline void smp_prepare_cpus(unsigned int maxcpus) { }
367#endif
368
369
370
371
372
373
374
375static void __init setup_command_line(char *command_line)
376{
377 size_t len = strlen(boot_command_line) + 1;
378
379 saved_command_line = memblock_alloc(len, SMP_CACHE_BYTES);
380 if (!saved_command_line)
381 panic("%s: Failed to allocate %zu bytes\n", __func__, len);
382
383 initcall_command_line = memblock_alloc(len, SMP_CACHE_BYTES);
384 if (!initcall_command_line)
385 panic("%s: Failed to allocate %zu bytes\n", __func__, len);
386
387 static_command_line = memblock_alloc(len, SMP_CACHE_BYTES);
388 if (!static_command_line)
389 panic("%s: Failed to allocate %zu bytes\n", __func__, len);
390
391 strcpy(saved_command_line, boot_command_line);
392 strcpy(static_command_line, command_line);
393}
394
395
396
397
398
399
400
401
402
403
404static __initdata DECLARE_COMPLETION(kthreadd_done);
405
406noinline void __ref rest_init(void)
407{
408 struct task_struct *tsk;
409 int pid;
410
411 rcu_scheduler_starting();
412
413
414
415
416
417 pid = kernel_thread(kernel_init, NULL, CLONE_FS);
418
419
420
421
422
423 rcu_read_lock();
424 tsk = find_task_by_pid_ns(pid, &init_pid_ns);
425 set_cpus_allowed_ptr(tsk, cpumask_of(smp_processor_id()));
426 rcu_read_unlock();
427
428 numa_default_policy();
429 pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES);
430 rcu_read_lock();
431 kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns);
432 rcu_read_unlock();
433
434
435
436
437
438
439
440
441 system_state = SYSTEM_SCHEDULING;
442
443 complete(&kthreadd_done);
444
445
446
447
448
449 schedule_preempt_disabled();
450
451 cpu_startup_entry(CPUHP_ONLINE);
452}
453
454
455static int __init do_early_param(char *param, char *val,
456 const char *unused, void *arg)
457{
458 const struct obs_kernel_param *p;
459
460 for (p = __setup_start; p < __setup_end; p++) {
461 if ((p->early && parameq(param, p->str)) ||
462 (strcmp(param, "console") == 0 &&
463 strcmp(p->str, "earlycon") == 0)
464 ) {
465 if (p->setup_func(val) != 0)
466 pr_warn("Malformed early option '%s'\n", param);
467 }
468 }
469
470 return 0;
471}
472
473void __init parse_early_options(char *cmdline)
474{
475 parse_args("early options", cmdline, NULL, 0, 0, 0, NULL,
476 do_early_param);
477}
478
479
480void __init parse_early_param(void)
481{
482 static int done __initdata;
483 static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata;
484
485 if (done)
486 return;
487
488
489 strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
490 parse_early_options(tmp_cmdline);
491 done = 1;
492}
493
494void __init __weak arch_post_acpi_subsys_init(void) { }
495
496void __init __weak smp_setup_processor_id(void)
497{
498}
499
500# if THREAD_SIZE >= PAGE_SIZE
501void __init __weak thread_stack_cache_init(void)
502{
503}
504#endif
505
506void __init __weak mem_encrypt_init(void) { }
507
508void __init __weak poking_init(void) { }
509
510void __init __weak pgd_cache_init(void) { }
511
512bool initcall_debug;
513core_param(initcall_debug, initcall_debug, bool, 0644);
514
515#ifdef TRACEPOINTS_ENABLED
516static void __init initcall_debug_enable(void);
517#else
518static inline void initcall_debug_enable(void)
519{
520}
521#endif
522
523
524
525
526static void __init mm_init(void)
527{
528
529
530
531
532 page_ext_init_flatmem();
533 mem_init();
534 kmem_cache_init();
535 pgtable_init();
536 debug_objects_mem_init();
537 vmalloc_init();
538 ioremap_huge_init();
539
540 init_espfix_bsp();
541
542 pti_init();
543 pgd_cache_init();
544}
545
546void __init __weak arch_call_rest_init(void)
547{
548 rest_init();
549}
550
551asmlinkage __visible void __init start_kernel(void)
552{
553 char *command_line;
554 char *after_dashes;
555
556 set_task_stack_end_magic(&init_task);
557 smp_setup_processor_id();
558 debug_objects_early_init();
559
560 cgroup_init_early();
561
562 local_irq_disable();
563 early_boot_irqs_disabled = true;
564
565
566
567
568
569 boot_cpu_init();
570 page_address_init();
571 pr_notice("%s", linux_banner);
572 setup_arch(&command_line);
573 mm_init_cpumask(&init_mm);
574 setup_command_line(command_line);
575 setup_nr_cpu_ids();
576 setup_per_cpu_areas();
577 smp_prepare_boot_cpu();
578 boot_cpu_hotplug_init();
579
580 build_all_zonelists(NULL);
581 page_alloc_init();
582
583 pr_notice("Kernel command line: %s\n", boot_command_line);
584
585 jump_label_init();
586 parse_early_param();
587 after_dashes = parse_args("Booting kernel",
588 static_command_line, __start___param,
589 __stop___param - __start___param,
590 -1, -1, NULL, &unknown_bootoption);
591 if (!IS_ERR_OR_NULL(after_dashes))
592 parse_args("Setting init args", after_dashes, NULL, 0, -1, -1,
593 NULL, set_init_arg);
594
595
596
597
598
599 setup_log_buf(0);
600 vfs_caches_init_early();
601 sort_main_extable();
602 trap_init();
603 mm_init();
604
605 ftrace_init();
606
607
608 early_trace_init();
609
610
611
612
613
614
615 sched_init();
616
617
618
619
620 preempt_disable();
621 if (WARN(!irqs_disabled(),
622 "Interrupts were enabled *very* early, fixing it\n"))
623 local_irq_disable();
624 radix_tree_init();
625
626
627
628
629
630 housekeeping_init();
631
632
633
634
635
636
637 workqueue_init_early();
638
639 rcu_init();
640
641
642 trace_init();
643
644 if (initcall_debug)
645 initcall_debug_enable();
646
647 context_tracking_init();
648
649 early_irq_init();
650 init_IRQ();
651 tick_init();
652 rcu_init_nohz();
653 init_timers();
654 hrtimers_init();
655 softirq_init();
656 timekeeping_init();
657
658
659
660
661
662
663
664
665
666 rand_initialize();
667 add_latent_entropy();
668 add_device_randomness(command_line, strlen(command_line));
669 boot_init_stack_canary();
670
671 time_init();
672 printk_safe_init();
673 perf_event_init();
674 profile_init();
675 call_function_init();
676 WARN(!irqs_disabled(), "Interrupts were enabled early\n");
677
678 early_boot_irqs_disabled = false;
679 local_irq_enable();
680
681 kmem_cache_init_late();
682
683
684
685
686
687
688 console_init();
689 if (panic_later)
690 panic("Too many boot %s vars at `%s'", panic_later,
691 panic_param);
692
693 lockdep_init();
694
695
696
697
698
699
700 locking_selftest();
701
702
703
704
705
706
707
708 mem_encrypt_init();
709
710#ifdef CONFIG_BLK_DEV_INITRD
711 if (initrd_start && !initrd_below_start_ok &&
712 page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) {
713 pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n",
714 page_to_pfn(virt_to_page((void *)initrd_start)),
715 min_low_pfn);
716 initrd_start = 0;
717 }
718#endif
719 kmemleak_init();
720 setup_per_cpu_pageset();
721 numa_policy_init();
722 acpi_early_init();
723 if (late_time_init)
724 late_time_init();
725 sched_clock_init();
726 calibrate_delay();
727 pid_idr_init();
728 anon_vma_init();
729#ifdef CONFIG_X86
730 if (efi_enabled(EFI_RUNTIME_SERVICES))
731 efi_enter_virtual_mode();
732#endif
733 thread_stack_cache_init();
734 cred_init();
735 fork_init();
736 proc_caches_init();
737 uts_ns_init();
738 buffer_init();
739 key_init();
740 security_init();
741 dbg_late_init();
742 vfs_caches_init();
743 pagecache_init();
744 signals_init();
745 seq_file_init();
746 proc_root_init();
747 nsfs_init();
748 cpuset_init();
749 cgroup_init();
750 taskstats_init_early();
751 delayacct_init();
752
753 poking_init();
754 check_bugs();
755
756 acpi_subsystem_init();
757 arch_post_acpi_subsys_init();
758 sfi_init_late();
759
760
761 arch_call_rest_init();
762}
763
764
765static void __init do_ctors(void)
766{
767#ifdef CONFIG_CONSTRUCTORS
768 ctor_fn_t *fn = (ctor_fn_t *) __ctors_start;
769
770 for (; fn < (ctor_fn_t *) __ctors_end; fn++)
771 (*fn)();
772#endif
773}
774
775#ifdef CONFIG_KALLSYMS
776struct blacklist_entry {
777 struct list_head next;
778 char *buf;
779};
780
781static __initdata_or_module LIST_HEAD(blacklisted_initcalls);
782
783static int __init initcall_blacklist(char *str)
784{
785 char *str_entry;
786 struct blacklist_entry *entry;
787
788
789 do {
790 str_entry = strsep(&str, ",");
791 if (str_entry) {
792 pr_debug("blacklisting initcall %s\n", str_entry);
793 entry = memblock_alloc(sizeof(*entry),
794 SMP_CACHE_BYTES);
795 if (!entry)
796 panic("%s: Failed to allocate %zu bytes\n",
797 __func__, sizeof(*entry));
798 entry->buf = memblock_alloc(strlen(str_entry) + 1,
799 SMP_CACHE_BYTES);
800 if (!entry->buf)
801 panic("%s: Failed to allocate %zu bytes\n",
802 __func__, strlen(str_entry) + 1);
803 strcpy(entry->buf, str_entry);
804 list_add(&entry->next, &blacklisted_initcalls);
805 }
806 } while (str_entry);
807
808 return 0;
809}
810
811static bool __init_or_module initcall_blacklisted(initcall_t fn)
812{
813 struct blacklist_entry *entry;
814 char fn_name[KSYM_SYMBOL_LEN];
815 unsigned long addr;
816
817 if (list_empty(&blacklisted_initcalls))
818 return false;
819
820 addr = (unsigned long) dereference_function_descriptor(fn);
821 sprint_symbol_no_offset(fn_name, addr);
822
823
824
825
826
827 strreplace(fn_name, ' ', '\0');
828
829 list_for_each_entry(entry, &blacklisted_initcalls, next) {
830 if (!strcmp(fn_name, entry->buf)) {
831 pr_debug("initcall %s blacklisted\n", fn_name);
832 return true;
833 }
834 }
835
836 return false;
837}
838#else
839static int __init initcall_blacklist(char *str)
840{
841 pr_warn("initcall_blacklist requires CONFIG_KALLSYMS\n");
842 return 0;
843}
844
845static bool __init_or_module initcall_blacklisted(initcall_t fn)
846{
847 return false;
848}
849#endif
850__setup("initcall_blacklist=", initcall_blacklist);
851
852static __init_or_module void
853trace_initcall_start_cb(void *data, initcall_t fn)
854{
855 ktime_t *calltime = (ktime_t *)data;
856
857 printk(KERN_DEBUG "calling %pS @ %i\n", fn, task_pid_nr(current));
858 *calltime = ktime_get();
859}
860
861static __init_or_module void
862trace_initcall_finish_cb(void *data, initcall_t fn, int ret)
863{
864 ktime_t *calltime = (ktime_t *)data;
865 ktime_t delta, rettime;
866 unsigned long long duration;
867
868 rettime = ktime_get();
869 delta = ktime_sub(rettime, *calltime);
870 duration = (unsigned long long) ktime_to_ns(delta) >> 10;
871 printk(KERN_DEBUG "initcall %pS returned %d after %lld usecs\n",
872 fn, ret, duration);
873}
874
875static ktime_t initcall_calltime;
876
877#ifdef TRACEPOINTS_ENABLED
878static void __init initcall_debug_enable(void)
879{
880 int ret;
881
882 ret = register_trace_initcall_start(trace_initcall_start_cb,
883 &initcall_calltime);
884 ret |= register_trace_initcall_finish(trace_initcall_finish_cb,
885 &initcall_calltime);
886 WARN(ret, "Failed to register initcall tracepoints\n");
887}
888# define do_trace_initcall_start trace_initcall_start
889# define do_trace_initcall_finish trace_initcall_finish
890#else
891static inline void do_trace_initcall_start(initcall_t fn)
892{
893 if (!initcall_debug)
894 return;
895 trace_initcall_start_cb(&initcall_calltime, fn);
896}
897static inline void do_trace_initcall_finish(initcall_t fn, int ret)
898{
899 if (!initcall_debug)
900 return;
901 trace_initcall_finish_cb(&initcall_calltime, fn, ret);
902}
903#endif
904
905int __init_or_module do_one_initcall(initcall_t fn)
906{
907 int count = preempt_count();
908 char msgbuf[64];
909 int ret;
910
911 if (initcall_blacklisted(fn))
912 return -EPERM;
913
914 do_trace_initcall_start(fn);
915 ret = fn();
916 do_trace_initcall_finish(fn, ret);
917
918 msgbuf[0] = 0;
919
920 if (preempt_count() != count) {
921 sprintf(msgbuf, "preemption imbalance ");
922 preempt_count_set(count);
923 }
924 if (irqs_disabled()) {
925 strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf));
926 local_irq_enable();
927 }
928 WARN(msgbuf[0], "initcall %pS returned with %s\n", fn, msgbuf);
929
930 add_latent_entropy();
931 return ret;
932}
933
934
935extern initcall_entry_t __initcall_start[];
936extern initcall_entry_t __initcall0_start[];
937extern initcall_entry_t __initcall1_start[];
938extern initcall_entry_t __initcall2_start[];
939extern initcall_entry_t __initcall3_start[];
940extern initcall_entry_t __initcall4_start[];
941extern initcall_entry_t __initcall5_start[];
942extern initcall_entry_t __initcall6_start[];
943extern initcall_entry_t __initcall7_start[];
944extern initcall_entry_t __initcall_end[];
945
946static initcall_entry_t *initcall_levels[] __initdata = {
947 __initcall0_start,
948 __initcall1_start,
949 __initcall2_start,
950 __initcall3_start,
951 __initcall4_start,
952 __initcall5_start,
953 __initcall6_start,
954 __initcall7_start,
955 __initcall_end,
956};
957
958
959static const char *initcall_level_names[] __initdata = {
960 "pure",
961 "core",
962 "postcore",
963 "arch",
964 "subsys",
965 "fs",
966 "device",
967 "late",
968};
969
970static void __init do_initcall_level(int level)
971{
972 initcall_entry_t *fn;
973
974 strcpy(initcall_command_line, saved_command_line);
975 parse_args(initcall_level_names[level],
976 initcall_command_line, __start___param,
977 __stop___param - __start___param,
978 level, level,
979 NULL, &repair_env_string);
980
981 trace_initcall_level(initcall_level_names[level]);
982 for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++)
983 do_one_initcall(initcall_from_entry(fn));
984}
985
986static void __init do_initcalls(void)
987{
988 int level;
989
990 for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++)
991 do_initcall_level(level);
992}
993
994
995
996
997
998
999
1000
1001static void __init do_basic_setup(void)
1002{
1003 cpuset_init_smp();
1004 shmem_init();
1005 driver_init();
1006 init_irq_proc();
1007 do_ctors();
1008 usermodehelper_enable();
1009 do_initcalls();
1010}
1011
1012static void __init do_pre_smp_initcalls(void)
1013{
1014 initcall_entry_t *fn;
1015
1016 trace_initcall_level("early");
1017 for (fn = __initcall_start; fn < __initcall0_start; fn++)
1018 do_one_initcall(initcall_from_entry(fn));
1019}
1020
1021static int run_init_process(const char *init_filename)
1022{
1023 argv_init[0] = init_filename;
1024 pr_info("Run %s as init process\n", init_filename);
1025 return do_execve(getname_kernel(init_filename),
1026 (const char __user *const __user *)argv_init,
1027 (const char __user *const __user *)envp_init);
1028}
1029
1030static int try_to_run_init_process(const char *init_filename)
1031{
1032 int ret;
1033
1034 ret = run_init_process(init_filename);
1035
1036 if (ret && ret != -ENOENT) {
1037 pr_err("Starting init: %s exists but couldn't execute it (error %d)\n",
1038 init_filename, ret);
1039 }
1040
1041 return ret;
1042}
1043
1044static noinline void __init kernel_init_freeable(void);
1045
1046#if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX)
1047bool rodata_enabled __ro_after_init = true;
1048static int __init set_debug_rodata(char *str)
1049{
1050 return strtobool(str, &rodata_enabled);
1051}
1052__setup("rodata=", set_debug_rodata);
1053#endif
1054
1055#ifdef CONFIG_STRICT_KERNEL_RWX
1056static void mark_readonly(void)
1057{
1058 if (rodata_enabled) {
1059
1060
1061
1062
1063
1064
1065 rcu_barrier();
1066 mark_rodata_ro();
1067 rodata_test();
1068 } else
1069 pr_info("Kernel memory protection disabled.\n");
1070}
1071#else
1072static inline void mark_readonly(void)
1073{
1074 pr_warn("This architecture does not have kernel memory protection.\n");
1075}
1076#endif
1077
1078void __weak free_initmem(void)
1079{
1080 free_initmem_default(POISON_FREE_INITMEM);
1081}
1082
1083static int __ref kernel_init(void *unused)
1084{
1085 int ret;
1086
1087 kernel_init_freeable();
1088
1089 async_synchronize_full();
1090 ftrace_free_init_mem();
1091 free_initmem();
1092 mark_readonly();
1093
1094
1095
1096
1097
1098 pti_finalize();
1099
1100 system_state = SYSTEM_RUNNING;
1101 numa_default_policy();
1102
1103 rcu_end_inkernel_boot();
1104
1105 if (ramdisk_execute_command) {
1106 ret = run_init_process(ramdisk_execute_command);
1107 if (!ret)
1108 return 0;
1109 pr_err("Failed to execute %s (error %d)\n",
1110 ramdisk_execute_command, ret);
1111 }
1112
1113
1114
1115
1116
1117
1118
1119 if (execute_command) {
1120 ret = run_init_process(execute_command);
1121 if (!ret)
1122 return 0;
1123 panic("Requested init %s failed (error %d).",
1124 execute_command, ret);
1125 }
1126 if (!try_to_run_init_process("/sbin/init") ||
1127 !try_to_run_init_process("/etc/init") ||
1128 !try_to_run_init_process("/bin/init") ||
1129 !try_to_run_init_process("/bin/sh"))
1130 return 0;
1131
1132 panic("No working init found. Try passing init= option to kernel. "
1133 "See Linux Documentation/admin-guide/init.rst for guidance.");
1134}
1135
1136static noinline void __init kernel_init_freeable(void)
1137{
1138
1139
1140
1141 wait_for_completion(&kthreadd_done);
1142
1143
1144 gfp_allowed_mask = __GFP_BITS_MASK;
1145
1146
1147
1148
1149 set_mems_allowed(node_states[N_MEMORY]);
1150
1151 cad_pid = task_pid(current);
1152
1153 smp_prepare_cpus(setup_max_cpus);
1154
1155 workqueue_init();
1156
1157 init_mm_internals();
1158
1159 do_pre_smp_initcalls();
1160 lockup_detector_init();
1161
1162 smp_init();
1163 sched_init_smp();
1164
1165 page_alloc_init_late();
1166
1167 page_ext_init();
1168
1169 do_basic_setup();
1170
1171
1172 if (ksys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
1173 pr_err("Warning: unable to open an initial console.\n");
1174
1175 (void) ksys_dup(0);
1176 (void) ksys_dup(0);
1177
1178
1179
1180
1181
1182 if (!ramdisk_execute_command)
1183 ramdisk_execute_command = "/init";
1184
1185 if (ksys_access((const char __user *)
1186 ramdisk_execute_command, 0) != 0) {
1187 ramdisk_execute_command = NULL;
1188 prepare_namespace();
1189 }
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200 integrity_load_keys();
1201}
1202