1
2
3
4
5
6
7
8
9
10
11
12#define DEBUG
13
14#include <linux/types.h>
15#include <linux/extable.h>
16#include <linux/module.h>
17#include <linux/proc_fs.h>
18#include <linux/binfmts.h>
19#include <linux/kernel.h>
20#include <linux/syscalls.h>
21#include <linux/stackprotector.h>
22#include <linux/string.h>
23#include <linux/ctype.h>
24#include <linux/delay.h>
25#include <linux/ioport.h>
26#include <linux/init.h>
27#include <linux/initrd.h>
28#include <linux/bootmem.h>
29#include <linux/acpi.h>
30#include <linux/console.h>
31#include <linux/nmi.h>
32#include <linux/percpu.h>
33#include <linux/kmod.h>
34#include <linux/vmalloc.h>
35#include <linux/kernel_stat.h>
36#include <linux/start_kernel.h>
37#include <linux/security.h>
38#include <linux/smp.h>
39#include <linux/profile.h>
40#include <linux/rcupdate.h>
41#include <linux/moduleparam.h>
42#include <linux/kallsyms.h>
43#include <linux/writeback.h>
44#include <linux/cpu.h>
45#include <linux/cpuset.h>
46#include <linux/cgroup.h>
47#include <linux/efi.h>
48#include <linux/tick.h>
49#include <linux/sched/isolation.h>
50#include <linux/interrupt.h>
51#include <linux/taskstats_kern.h>
52#include <linux/delayacct.h>
53#include <linux/unistd.h>
54#include <linux/utsname.h>
55#include <linux/rmap.h>
56#include <linux/mempolicy.h>
57#include <linux/key.h>
58#include <linux/buffer_head.h>
59#include <linux/page_ext.h>
60#include <linux/debug_locks.h>
61#include <linux/debugobjects.h>
62#include <linux/lockdep.h>
63#include <linux/kmemleak.h>
64#include <linux/pid_namespace.h>
65#include <linux/device.h>
66#include <linux/kthread.h>
67#include <linux/sched.h>
68#include <linux/sched/init.h>
69#include <linux/signal.h>
70#include <linux/idr.h>
71#include <linux/kgdb.h>
72#include <linux/ftrace.h>
73#include <linux/async.h>
74#include <linux/sfi.h>
75#include <linux/shmem_fs.h>
76#include <linux/slab.h>
77#include <linux/perf_event.h>
78#include <linux/ptrace.h>
79#include <linux/pti.h>
80#include <linux/blkdev.h>
81#include <linux/elevator.h>
82#include <linux/sched_clock.h>
83#include <linux/sched/task.h>
84#include <linux/sched/task_stack.h>
85#include <linux/context_tracking.h>
86#include <linux/random.h>
87#include <linux/list.h>
88#include <linux/integrity.h>
89#include <linux/proc_ns.h>
90#include <linux/io.h>
91#include <linux/cache.h>
92#include <linux/rodata_test.h>
93#include <linux/jump_label.h>
94#include <linux/mem_encrypt.h>
95
96#include <asm/io.h>
97#include <asm/bugs.h>
98#include <asm/setup.h>
99#include <asm/sections.h>
100#include <asm/cacheflush.h>
101
102#define CREATE_TRACE_POINTS
103#include <trace/events/initcall.h>
104
105static int kernel_init(void *);
106
107extern void init_IRQ(void);
108extern void fork_init(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 saved_command_line =
378 memblock_virt_alloc(strlen(boot_command_line) + 1, 0);
379 initcall_command_line =
380 memblock_virt_alloc(strlen(boot_command_line) + 1, 0);
381 static_command_line = memblock_virt_alloc(strlen(command_line) + 1, 0);
382 strcpy(saved_command_line, boot_command_line);
383 strcpy(static_command_line, command_line);
384}
385
386
387
388
389
390
391
392
393
394
395static __initdata DECLARE_COMPLETION(kthreadd_done);
396
397static noinline void __ref rest_init(void)
398{
399 struct task_struct *tsk;
400 int pid;
401
402 rcu_scheduler_starting();
403
404
405
406
407
408 pid = kernel_thread(kernel_init, NULL, CLONE_FS);
409
410
411
412
413
414 rcu_read_lock();
415 tsk = find_task_by_pid_ns(pid, &init_pid_ns);
416 set_cpus_allowed_ptr(tsk, cpumask_of(smp_processor_id()));
417 rcu_read_unlock();
418
419 numa_default_policy();
420 pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES);
421 rcu_read_lock();
422 kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns);
423 rcu_read_unlock();
424
425
426
427
428
429
430
431
432 system_state = SYSTEM_SCHEDULING;
433
434 complete(&kthreadd_done);
435
436
437
438
439
440 schedule_preempt_disabled();
441
442 cpu_startup_entry(CPUHP_ONLINE);
443}
444
445
446static int __init do_early_param(char *param, char *val,
447 const char *unused, void *arg)
448{
449 const struct obs_kernel_param *p;
450
451 for (p = __setup_start; p < __setup_end; p++) {
452 if ((p->early && parameq(param, p->str)) ||
453 (strcmp(param, "console") == 0 &&
454 strcmp(p->str, "earlycon") == 0)
455 ) {
456 if (p->setup_func(val) != 0)
457 pr_warn("Malformed early option '%s'\n", param);
458 }
459 }
460
461 return 0;
462}
463
464void __init parse_early_options(char *cmdline)
465{
466 parse_args("early options", cmdline, NULL, 0, 0, 0, NULL,
467 do_early_param);
468}
469
470
471void __init parse_early_param(void)
472{
473 static int done __initdata;
474 static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata;
475
476 if (done)
477 return;
478
479
480 strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
481 parse_early_options(tmp_cmdline);
482 done = 1;
483}
484
485void __init __weak arch_post_acpi_subsys_init(void) { }
486
487void __init __weak smp_setup_processor_id(void)
488{
489}
490
491# if THREAD_SIZE >= PAGE_SIZE
492void __init __weak thread_stack_cache_init(void)
493{
494}
495#endif
496
497void __init __weak mem_encrypt_init(void) { }
498
499bool initcall_debug;
500core_param(initcall_debug, initcall_debug, bool, 0644);
501
502#ifdef TRACEPOINTS_ENABLED
503static void __init initcall_debug_enable(void);
504#else
505static inline void initcall_debug_enable(void)
506{
507}
508#endif
509
510
511
512
513static void __init mm_init(void)
514{
515
516
517
518
519 page_ext_init_flatmem();
520 mem_init();
521 kmem_cache_init();
522 pgtable_init();
523 vmalloc_init();
524 ioremap_huge_init();
525
526 init_espfix_bsp();
527
528 pti_init();
529}
530
531asmlinkage __visible void __init start_kernel(void)
532{
533 char *command_line;
534 char *after_dashes;
535
536 set_task_stack_end_magic(&init_task);
537 smp_setup_processor_id();
538 debug_objects_early_init();
539
540 cgroup_init_early();
541
542 local_irq_disable();
543 early_boot_irqs_disabled = true;
544
545
546
547
548
549 boot_cpu_init();
550 page_address_init();
551 pr_notice("%s", linux_banner);
552 setup_arch(&command_line);
553
554
555
556
557 add_latent_entropy();
558 add_device_randomness(command_line, strlen(command_line));
559 boot_init_stack_canary();
560 mm_init_cpumask(&init_mm);
561 setup_command_line(command_line);
562 setup_nr_cpu_ids();
563 setup_per_cpu_areas();
564 boot_cpu_state_init();
565 smp_prepare_boot_cpu();
566
567 build_all_zonelists(NULL);
568 page_alloc_init();
569
570 pr_notice("Kernel command line: %s\n", boot_command_line);
571 parse_early_param();
572 after_dashes = parse_args("Booting kernel",
573 static_command_line, __start___param,
574 __stop___param - __start___param,
575 -1, -1, NULL, &unknown_bootoption);
576 if (!IS_ERR_OR_NULL(after_dashes))
577 parse_args("Setting init args", after_dashes, NULL, 0, -1, -1,
578 NULL, set_init_arg);
579
580 jump_label_init();
581
582
583
584
585
586 setup_log_buf(0);
587 vfs_caches_init_early();
588 sort_main_extable();
589 trap_init();
590 mm_init();
591
592 ftrace_init();
593
594
595 early_trace_init();
596
597
598
599
600
601
602 sched_init();
603
604
605
606
607 preempt_disable();
608 if (WARN(!irqs_disabled(),
609 "Interrupts were enabled *very* early, fixing it\n"))
610 local_irq_disable();
611 radix_tree_init();
612
613
614
615
616
617 housekeeping_init();
618
619
620
621
622
623
624 workqueue_init_early();
625
626 rcu_init();
627
628
629 trace_init();
630
631 if (initcall_debug)
632 initcall_debug_enable();
633
634 context_tracking_init();
635
636 early_irq_init();
637 init_IRQ();
638 tick_init();
639 rcu_init_nohz();
640 init_timers();
641 hrtimers_init();
642 softirq_init();
643 timekeeping_init();
644 time_init();
645 sched_clock_postinit();
646 printk_safe_init();
647 perf_event_init();
648 profile_init();
649 call_function_init();
650 WARN(!irqs_disabled(), "Interrupts were enabled early\n");
651 early_boot_irqs_disabled = false;
652 local_irq_enable();
653
654 kmem_cache_init_late();
655
656
657
658
659
660
661 console_init();
662 if (panic_later)
663 panic("Too many boot %s vars at `%s'", panic_later,
664 panic_param);
665
666 lockdep_info();
667
668
669
670
671
672
673 locking_selftest();
674
675
676
677
678
679
680
681 mem_encrypt_init();
682
683#ifdef CONFIG_BLK_DEV_INITRD
684 if (initrd_start && !initrd_below_start_ok &&
685 page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) {
686 pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n",
687 page_to_pfn(virt_to_page((void *)initrd_start)),
688 min_low_pfn);
689 initrd_start = 0;
690 }
691#endif
692 page_ext_init();
693 kmemleak_init();
694 debug_objects_mem_init();
695 setup_per_cpu_pageset();
696 numa_policy_init();
697 acpi_early_init();
698 if (late_time_init)
699 late_time_init();
700 calibrate_delay();
701 pid_idr_init();
702 anon_vma_init();
703#ifdef CONFIG_X86
704 if (efi_enabled(EFI_RUNTIME_SERVICES))
705 efi_enter_virtual_mode();
706#endif
707 thread_stack_cache_init();
708 cred_init();
709 fork_init();
710 proc_caches_init();
711 uts_ns_init();
712 buffer_init();
713 key_init();
714 security_init();
715 dbg_late_init();
716 vfs_caches_init();
717 pagecache_init();
718 signals_init();
719 seq_file_init();
720 proc_root_init();
721 nsfs_init();
722 cpuset_init();
723 cgroup_init();
724 taskstats_init_early();
725 delayacct_init();
726
727 check_bugs();
728
729 acpi_subsystem_init();
730 arch_post_acpi_subsys_init();
731 sfi_init_late();
732
733 if (efi_enabled(EFI_RUNTIME_SERVICES)) {
734 efi_free_boot_services();
735 }
736
737
738 rest_init();
739}
740
741
742static void __init do_ctors(void)
743{
744#ifdef CONFIG_CONSTRUCTORS
745 ctor_fn_t *fn = (ctor_fn_t *) __ctors_start;
746
747 for (; fn < (ctor_fn_t *) __ctors_end; fn++)
748 (*fn)();
749#endif
750}
751
752#ifdef CONFIG_KALLSYMS
753struct blacklist_entry {
754 struct list_head next;
755 char *buf;
756};
757
758static __initdata_or_module LIST_HEAD(blacklisted_initcalls);
759
760static int __init initcall_blacklist(char *str)
761{
762 char *str_entry;
763 struct blacklist_entry *entry;
764
765
766 do {
767 str_entry = strsep(&str, ",");
768 if (str_entry) {
769 pr_debug("blacklisting initcall %s\n", str_entry);
770 entry = alloc_bootmem(sizeof(*entry));
771 entry->buf = alloc_bootmem(strlen(str_entry) + 1);
772 strcpy(entry->buf, str_entry);
773 list_add(&entry->next, &blacklisted_initcalls);
774 }
775 } while (str_entry);
776
777 return 0;
778}
779
780static bool __init_or_module initcall_blacklisted(initcall_t fn)
781{
782 struct blacklist_entry *entry;
783 char fn_name[KSYM_SYMBOL_LEN];
784 unsigned long addr;
785
786 if (list_empty(&blacklisted_initcalls))
787 return false;
788
789 addr = (unsigned long) dereference_function_descriptor(fn);
790 sprint_symbol_no_offset(fn_name, addr);
791
792
793
794
795
796 strreplace(fn_name, ' ', '\0');
797
798 list_for_each_entry(entry, &blacklisted_initcalls, next) {
799 if (!strcmp(fn_name, entry->buf)) {
800 pr_debug("initcall %s blacklisted\n", fn_name);
801 return true;
802 }
803 }
804
805 return false;
806}
807#else
808static int __init initcall_blacklist(char *str)
809{
810 pr_warn("initcall_blacklist requires CONFIG_KALLSYMS\n");
811 return 0;
812}
813
814static bool __init_or_module initcall_blacklisted(initcall_t fn)
815{
816 return false;
817}
818#endif
819__setup("initcall_blacklist=", initcall_blacklist);
820
821static __init_or_module void
822trace_initcall_start_cb(void *data, initcall_t fn)
823{
824 ktime_t *calltime = (ktime_t *)data;
825
826 printk(KERN_DEBUG "calling %pF @ %i\n", fn, task_pid_nr(current));
827 *calltime = ktime_get();
828}
829
830static __init_or_module void
831trace_initcall_finish_cb(void *data, initcall_t fn, int ret)
832{
833 ktime_t *calltime = (ktime_t *)data;
834 ktime_t delta, rettime;
835 unsigned long long duration;
836
837 rettime = ktime_get();
838 delta = ktime_sub(rettime, *calltime);
839 duration = (unsigned long long) ktime_to_ns(delta) >> 10;
840 printk(KERN_DEBUG "initcall %pF returned %d after %lld usecs\n",
841 fn, ret, duration);
842}
843
844static ktime_t initcall_calltime;
845
846#ifdef TRACEPOINTS_ENABLED
847static void __init initcall_debug_enable(void)
848{
849 int ret;
850
851 ret = register_trace_initcall_start(trace_initcall_start_cb,
852 &initcall_calltime);
853 ret |= register_trace_initcall_finish(trace_initcall_finish_cb,
854 &initcall_calltime);
855 WARN(ret, "Failed to register initcall tracepoints\n");
856}
857# define do_trace_initcall_start trace_initcall_start
858# define do_trace_initcall_finish trace_initcall_finish
859#else
860static inline void do_trace_initcall_start(initcall_t fn)
861{
862 if (!initcall_debug)
863 return;
864 trace_initcall_start_cb(&initcall_calltime, fn);
865}
866static inline void do_trace_initcall_finish(initcall_t fn, int ret)
867{
868 if (!initcall_debug)
869 return;
870 trace_initcall_finish_cb(&initcall_calltime, fn, ret);
871}
872#endif
873
874int __init_or_module do_one_initcall(initcall_t fn)
875{
876 int count = preempt_count();
877 char msgbuf[64];
878 int ret;
879
880 if (initcall_blacklisted(fn))
881 return -EPERM;
882
883 do_trace_initcall_start(fn);
884 ret = fn();
885 do_trace_initcall_finish(fn, ret);
886
887 msgbuf[0] = 0;
888
889 if (preempt_count() != count) {
890 sprintf(msgbuf, "preemption imbalance ");
891 preempt_count_set(count);
892 }
893 if (irqs_disabled()) {
894 strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf));
895 local_irq_enable();
896 }
897 WARN(msgbuf[0], "initcall %pF returned with %s\n", fn, msgbuf);
898
899 add_latent_entropy();
900 return ret;
901}
902
903
904extern initcall_t __initcall_start[];
905extern initcall_t __initcall0_start[];
906extern initcall_t __initcall1_start[];
907extern initcall_t __initcall2_start[];
908extern initcall_t __initcall3_start[];
909extern initcall_t __initcall4_start[];
910extern initcall_t __initcall5_start[];
911extern initcall_t __initcall6_start[];
912extern initcall_t __initcall7_start[];
913extern initcall_t __initcall_end[];
914
915static initcall_t *initcall_levels[] __initdata = {
916 __initcall0_start,
917 __initcall1_start,
918 __initcall2_start,
919 __initcall3_start,
920 __initcall4_start,
921 __initcall5_start,
922 __initcall6_start,
923 __initcall7_start,
924 __initcall_end,
925};
926
927
928static char *initcall_level_names[] __initdata = {
929 "pure",
930 "core",
931 "postcore",
932 "arch",
933 "subsys",
934 "fs",
935 "device",
936 "late",
937};
938
939static void __init do_initcall_level(int level)
940{
941 initcall_t *fn;
942
943 strcpy(initcall_command_line, saved_command_line);
944 parse_args(initcall_level_names[level],
945 initcall_command_line, __start___param,
946 __stop___param - __start___param,
947 level, level,
948 NULL, &repair_env_string);
949
950 trace_initcall_level(initcall_level_names[level]);
951 for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++)
952 do_one_initcall(*fn);
953}
954
955static void __init do_initcalls(void)
956{
957 int level;
958
959 for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++)
960 do_initcall_level(level);
961}
962
963
964
965
966
967
968
969
970static void __init do_basic_setup(void)
971{
972 cpuset_init_smp();
973 shmem_init();
974 driver_init();
975 init_irq_proc();
976 do_ctors();
977 usermodehelper_enable();
978 do_initcalls();
979}
980
981static void __init do_pre_smp_initcalls(void)
982{
983 initcall_t *fn;
984
985 trace_initcall_level("early");
986 for (fn = __initcall_start; fn < __initcall0_start; fn++)
987 do_one_initcall(*fn);
988}
989
990
991
992
993
994
995
996void __init load_default_modules(void)
997{
998 load_default_elevator_module();
999}
1000
1001static int run_init_process(const char *init_filename)
1002{
1003 argv_init[0] = init_filename;
1004 return do_execve(getname_kernel(init_filename),
1005 (const char __user *const __user *)argv_init,
1006 (const char __user *const __user *)envp_init);
1007}
1008
1009static int try_to_run_init_process(const char *init_filename)
1010{
1011 int ret;
1012
1013 ret = run_init_process(init_filename);
1014
1015 if (ret && ret != -ENOENT) {
1016 pr_err("Starting init: %s exists but couldn't execute it (error %d)\n",
1017 init_filename, ret);
1018 }
1019
1020 return ret;
1021}
1022
1023static noinline void __init kernel_init_freeable(void);
1024
1025#if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX)
1026bool rodata_enabled __ro_after_init = true;
1027static int __init set_debug_rodata(char *str)
1028{
1029 return strtobool(str, &rodata_enabled);
1030}
1031__setup("rodata=", set_debug_rodata);
1032#endif
1033
1034#ifdef CONFIG_STRICT_KERNEL_RWX
1035static void mark_readonly(void)
1036{
1037 if (rodata_enabled) {
1038
1039
1040
1041
1042
1043
1044 rcu_barrier_sched();
1045 mark_rodata_ro();
1046 rodata_test();
1047 } else
1048 pr_info("Kernel memory protection disabled.\n");
1049}
1050#else
1051static inline void mark_readonly(void)
1052{
1053 pr_warn("This architecture does not have kernel memory protection.\n");
1054}
1055#endif
1056
1057static int __ref kernel_init(void *unused)
1058{
1059 int ret;
1060
1061 kernel_init_freeable();
1062
1063 async_synchronize_full();
1064 ftrace_free_init_mem();
1065 jump_label_invalidate_initmem();
1066 free_initmem();
1067 mark_readonly();
1068 system_state = SYSTEM_RUNNING;
1069 numa_default_policy();
1070
1071 rcu_end_inkernel_boot();
1072
1073 if (ramdisk_execute_command) {
1074 ret = run_init_process(ramdisk_execute_command);
1075 if (!ret)
1076 return 0;
1077 pr_err("Failed to execute %s (error %d)\n",
1078 ramdisk_execute_command, ret);
1079 }
1080
1081
1082
1083
1084
1085
1086
1087 if (execute_command) {
1088 ret = run_init_process(execute_command);
1089 if (!ret)
1090 return 0;
1091 panic("Requested init %s failed (error %d).",
1092 execute_command, ret);
1093 }
1094 if (!try_to_run_init_process("/sbin/init") ||
1095 !try_to_run_init_process("/etc/init") ||
1096 !try_to_run_init_process("/bin/init") ||
1097 !try_to_run_init_process("/bin/sh"))
1098 return 0;
1099
1100 panic("No working init found. Try passing init= option to kernel. "
1101 "See Linux Documentation/admin-guide/init.rst for guidance.");
1102}
1103
1104static noinline void __init kernel_init_freeable(void)
1105{
1106
1107
1108
1109 wait_for_completion(&kthreadd_done);
1110
1111
1112 gfp_allowed_mask = __GFP_BITS_MASK;
1113
1114
1115
1116
1117 set_mems_allowed(node_states[N_MEMORY]);
1118
1119 cad_pid = task_pid(current);
1120
1121 smp_prepare_cpus(setup_max_cpus);
1122
1123 workqueue_init();
1124
1125 init_mm_internals();
1126
1127 do_pre_smp_initcalls();
1128 lockup_detector_init();
1129
1130 smp_init();
1131 sched_init_smp();
1132
1133 page_alloc_init_late();
1134
1135 do_basic_setup();
1136
1137
1138 if (ksys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
1139 pr_err("Warning: unable to open an initial console.\n");
1140
1141 (void) ksys_dup(0);
1142 (void) ksys_dup(0);
1143
1144
1145
1146
1147
1148 if (!ramdisk_execute_command)
1149 ramdisk_execute_command = "/init";
1150
1151 if (ksys_access((const char __user *)
1152 ramdisk_execute_command, 0) != 0) {
1153 ramdisk_execute_command = NULL;
1154 prepare_namespace();
1155 }
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166 integrity_load_keys();
1167 load_default_modules();
1168}
1169