1
2
3
4
5
6
7
8
9
10
11
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/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/rcupdate.h>
44#include <linux/moduleparam.h>
45#include <linux/kallsyms.h>
46#include <linux/writeback.h>
47#include <linux/cpu.h>
48#include <linux/cpuset.h>
49#include <linux/cgroup.h>
50#include <linux/efi.h>
51#include <linux/tick.h>
52#include <linux/sched/isolation.h>
53#include <linux/interrupt.h>
54#include <linux/taskstats_kern.h>
55#include <linux/delayacct.h>
56#include <linux/unistd.h>
57#include <linux/utsname.h>
58#include <linux/rmap.h>
59#include <linux/mempolicy.h>
60#include <linux/key.h>
61#include <linux/buffer_head.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/sfi.h>
79#include <linux/shmem_fs.h>
80#include <linux/slab.h>
81#include <linux/perf_event.h>
82#include <linux/ptrace.h>
83#include <linux/pti.h>
84#include <linux/blkdev.h>
85#include <linux/elevator.h>
86#include <linux/sched/clock.h>
87#include <linux/sched/task.h>
88#include <linux/sched/task_stack.h>
89#include <linux/context_tracking.h>
90#include <linux/random.h>
91#include <linux/list.h>
92#include <linux/integrity.h>
93#include <linux/proc_ns.h>
94#include <linux/io.h>
95#include <linux/cache.h>
96#include <linux/rodata_test.h>
97#include <linux/jump_label.h>
98#include <linux/mem_encrypt.h>
99#include <linux/kcsan.h>
100#include <linux/init_syscalls.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
111static int kernel_init(void *);
112
113extern void init_IRQ(void);
114extern void radix_tree_init(void);
115
116
117
118
119
120
121
122
123bool early_boot_irqs_disabled __read_mostly;
124
125enum system_states system_state __read_mostly;
126EXPORT_SYMBOL(system_state);
127
128
129
130
131#define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT
132#define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT
133
134extern void time_init(void);
135
136void (*__initdata late_time_init)(void);
137
138
139char __initdata boot_command_line[COMMAND_LINE_SIZE];
140
141char *saved_command_line;
142
143static char *static_command_line;
144
145static char *extra_command_line;
146
147static char *extra_init_args;
148
149#ifdef CONFIG_BOOT_CONFIG
150
151static bool bootconfig_found;
152static bool initargs_found;
153#else
154# define bootconfig_found false
155# define initargs_found false
156#endif
157
158static char *execute_command;
159static char *ramdisk_execute_command = "/init";
160
161
162
163
164
165bool static_key_initialized __read_mostly;
166EXPORT_SYMBOL_GPL(static_key_initialized);
167
168
169
170
171
172
173
174
175
176
177unsigned int reset_devices;
178EXPORT_SYMBOL(reset_devices);
179
180static int __init set_reset_devices(char *str)
181{
182 reset_devices = 1;
183 return 1;
184}
185
186__setup("reset_devices", set_reset_devices);
187
188static const char *argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };
189const char *envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, };
190static const char *panic_later, *panic_param;
191
192extern const struct obs_kernel_param __setup_start[], __setup_end[];
193
194static bool __init obsolete_checksetup(char *line)
195{
196 const struct obs_kernel_param *p;
197 bool had_early_param = false;
198
199 p = __setup_start;
200 do {
201 int n = strlen(p->str);
202 if (parameqn(line, p->str, n)) {
203 if (p->early) {
204
205
206
207
208 if (line[n] == '\0' || line[n] == '=')
209 had_early_param = true;
210 } else if (!p->setup_func) {
211 pr_warn("Parameter %s is obsolete, ignored\n",
212 p->str);
213 return true;
214 } else if (p->setup_func(line + n))
215 return true;
216 }
217 p++;
218 } while (p < __setup_end);
219
220 return had_early_param;
221}
222
223
224
225
226
227unsigned long loops_per_jiffy = (1<<12);
228EXPORT_SYMBOL(loops_per_jiffy);
229
230static int __init debug_kernel(char *str)
231{
232 console_loglevel = CONSOLE_LOGLEVEL_DEBUG;
233 return 0;
234}
235
236static int __init quiet_kernel(char *str)
237{
238 console_loglevel = CONSOLE_LOGLEVEL_QUIET;
239 return 0;
240}
241
242early_param("debug", debug_kernel);
243early_param("quiet", quiet_kernel);
244
245static int __init loglevel(char *str)
246{
247 int newlevel;
248
249
250
251
252
253
254 if (get_option(&str, &newlevel)) {
255 console_loglevel = newlevel;
256 return 0;
257 }
258
259 return -EINVAL;
260}
261
262early_param("loglevel", loglevel);
263
264#ifdef CONFIG_BLK_DEV_INITRD
265static void * __init get_boot_config_from_initrd(u32 *_size, u32 *_csum)
266{
267 u32 size, csum;
268 char *data;
269 u32 *hdr;
270
271 if (!initrd_end)
272 return NULL;
273
274 data = (char *)initrd_end - BOOTCONFIG_MAGIC_LEN;
275 if (memcmp(data, BOOTCONFIG_MAGIC, BOOTCONFIG_MAGIC_LEN))
276 return NULL;
277
278 hdr = (u32 *)(data - 8);
279 size = hdr[0];
280 csum = hdr[1];
281
282 data = ((void *)hdr) - size;
283 if ((unsigned long)data < initrd_start) {
284 pr_err("bootconfig size %d is greater than initrd size %ld\n",
285 size, initrd_end - initrd_start);
286 return NULL;
287 }
288
289
290 initrd_end = (unsigned long)data;
291 if (_size)
292 *_size = size;
293 if (_csum)
294 *_csum = csum;
295
296 return data;
297}
298#else
299static void * __init get_boot_config_from_initrd(u32 *_size, u32 *_csum)
300{
301 return NULL;
302}
303#endif
304
305#ifdef CONFIG_BOOT_CONFIG
306
307static char xbc_namebuf[XBC_KEYLEN_MAX] __initdata;
308
309#define rest(dst, end) ((end) > (dst) ? (end) - (dst) : 0)
310
311static int __init xbc_snprint_cmdline(char *buf, size_t size,
312 struct xbc_node *root)
313{
314 struct xbc_node *knode, *vnode;
315 char *end = buf + size;
316 const char *val;
317 int ret;
318
319 xbc_node_for_each_key_value(root, knode, val) {
320 ret = xbc_node_compose_key_after(root, knode,
321 xbc_namebuf, XBC_KEYLEN_MAX);
322 if (ret < 0)
323 return ret;
324
325 vnode = xbc_node_get_child(knode);
326 if (!vnode) {
327 ret = snprintf(buf, rest(buf, end), "%s ", xbc_namebuf);
328 if (ret < 0)
329 return ret;
330 buf += ret;
331 continue;
332 }
333 xbc_array_for_each_value(vnode, val) {
334 ret = snprintf(buf, rest(buf, end), "%s=\"%s\" ",
335 xbc_namebuf, val);
336 if (ret < 0)
337 return ret;
338 buf += ret;
339 }
340 }
341
342 return buf - (end - size);
343}
344#undef rest
345
346
347static char * __init xbc_make_cmdline(const char *key)
348{
349 struct xbc_node *root;
350 char *new_cmdline;
351 int ret, len = 0;
352
353 root = xbc_find_node(key);
354 if (!root)
355 return NULL;
356
357
358 len = xbc_snprint_cmdline(NULL, 0, root);
359 if (len <= 0)
360 return NULL;
361
362 new_cmdline = memblock_alloc(len + 1, SMP_CACHE_BYTES);
363 if (!new_cmdline) {
364 pr_err("Failed to allocate memory for extra kernel cmdline.\n");
365 return NULL;
366 }
367
368 ret = xbc_snprint_cmdline(new_cmdline, len + 1, root);
369 if (ret < 0 || ret > len) {
370 pr_err("Failed to print extra kernel cmdline.\n");
371 return NULL;
372 }
373
374 return new_cmdline;
375}
376
377static u32 boot_config_checksum(unsigned char *p, u32 size)
378{
379 u32 ret = 0;
380
381 while (size--)
382 ret += *p++;
383
384 return ret;
385}
386
387static int __init bootconfig_params(char *param, char *val,
388 const char *unused, void *arg)
389{
390 if (strcmp(param, "bootconfig") == 0) {
391 bootconfig_found = true;
392 }
393 return 0;
394}
395
396static void __init setup_boot_config(const char *cmdline)
397{
398 static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata;
399 const char *msg;
400 int pos;
401 u32 size, csum;
402 char *data, *copy, *err;
403 int ret;
404
405
406 data = get_boot_config_from_initrd(&size, &csum);
407
408 strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
409 err = parse_args("bootconfig", tmp_cmdline, NULL, 0, 0, 0, NULL,
410 bootconfig_params);
411
412 if (IS_ERR(err) || !bootconfig_found)
413 return;
414
415
416 if (err)
417 initargs_found = true;
418
419 if (!data) {
420 pr_err("'bootconfig' found on command line, but no bootconfig found\n");
421 return;
422 }
423
424 if (size >= XBC_DATA_MAX) {
425 pr_err("bootconfig size %d greater than max size %d\n",
426 size, XBC_DATA_MAX);
427 return;
428 }
429
430 if (boot_config_checksum((unsigned char *)data, size) != csum) {
431 pr_err("bootconfig checksum failed\n");
432 return;
433 }
434
435 copy = memblock_alloc(size + 1, SMP_CACHE_BYTES);
436 if (!copy) {
437 pr_err("Failed to allocate memory for bootconfig\n");
438 return;
439 }
440
441 memcpy(copy, data, size);
442 copy[size] = '\0';
443
444 ret = xbc_init(copy, &msg, &pos);
445 if (ret < 0) {
446 if (pos < 0)
447 pr_err("Failed to init bootconfig: %s.\n", msg);
448 else
449 pr_err("Failed to parse bootconfig: %s at %d.\n",
450 msg, pos);
451 } else {
452 pr_info("Load bootconfig: %d bytes %d nodes\n", size, ret);
453
454 extra_command_line = xbc_make_cmdline("kernel");
455
456 extra_init_args = xbc_make_cmdline("init");
457 }
458 return;
459}
460
461#else
462
463static void __init setup_boot_config(const char *cmdline)
464{
465
466 get_boot_config_from_initrd(NULL, NULL);
467}
468
469static int __init warn_bootconfig(char *str)
470{
471 pr_warn("WARNING: 'bootconfig' found on the kernel command line but CONFIG_BOOTCONFIG is not set.\n");
472 return 0;
473}
474early_param("bootconfig", warn_bootconfig);
475
476#endif
477
478
479static void __init repair_env_string(char *param, char *val)
480{
481 if (val) {
482
483 if (val == param+strlen(param)+1)
484 val[-1] = '=';
485 else if (val == param+strlen(param)+2) {
486 val[-2] = '=';
487 memmove(val-1, val, strlen(val)+1);
488 } else
489 BUG();
490 }
491}
492
493
494static int __init set_init_arg(char *param, char *val,
495 const char *unused, void *arg)
496{
497 unsigned int i;
498
499 if (panic_later)
500 return 0;
501
502 repair_env_string(param, val);
503
504 for (i = 0; argv_init[i]; i++) {
505 if (i == MAX_INIT_ARGS) {
506 panic_later = "init";
507 panic_param = param;
508 return 0;
509 }
510 }
511 argv_init[i] = param;
512 return 0;
513}
514
515
516
517
518
519static int __init unknown_bootoption(char *param, char *val,
520 const char *unused, void *arg)
521{
522 size_t len = strlen(param);
523
524 repair_env_string(param, val);
525
526
527 if (obsolete_checksetup(param))
528 return 0;
529
530
531 if (strnchr(param, len, '.'))
532 return 0;
533
534 if (panic_later)
535 return 0;
536
537 if (val) {
538
539 unsigned int i;
540 for (i = 0; envp_init[i]; i++) {
541 if (i == MAX_INIT_ENVS) {
542 panic_later = "env";
543 panic_param = param;
544 }
545 if (!strncmp(param, envp_init[i], len+1))
546 break;
547 }
548 envp_init[i] = param;
549 } else {
550
551 unsigned int i;
552 for (i = 0; argv_init[i]; i++) {
553 if (i == MAX_INIT_ARGS) {
554 panic_later = "init";
555 panic_param = param;
556 }
557 }
558 argv_init[i] = param;
559 }
560 return 0;
561}
562
563static int __init init_setup(char *str)
564{
565 unsigned int i;
566
567 execute_command = str;
568
569
570
571
572
573
574 for (i = 1; i < MAX_INIT_ARGS; i++)
575 argv_init[i] = NULL;
576 return 1;
577}
578__setup("init=", init_setup);
579
580static int __init rdinit_setup(char *str)
581{
582 unsigned int i;
583
584 ramdisk_execute_command = str;
585
586 for (i = 1; i < MAX_INIT_ARGS; i++)
587 argv_init[i] = NULL;
588 return 1;
589}
590__setup("rdinit=", rdinit_setup);
591
592#ifndef CONFIG_SMP
593static const unsigned int setup_max_cpus = NR_CPUS;
594static inline void setup_nr_cpu_ids(void) { }
595static inline void smp_prepare_cpus(unsigned int maxcpus) { }
596#endif
597
598
599
600
601
602
603
604static void __init setup_command_line(char *command_line)
605{
606 size_t len, xlen = 0, ilen = 0;
607
608 if (extra_command_line)
609 xlen = strlen(extra_command_line);
610 if (extra_init_args)
611 ilen = strlen(extra_init_args) + 4;
612
613 len = xlen + strlen(boot_command_line) + 1;
614
615 saved_command_line = memblock_alloc(len + ilen, SMP_CACHE_BYTES);
616 if (!saved_command_line)
617 panic("%s: Failed to allocate %zu bytes\n", __func__, len + ilen);
618
619 static_command_line = memblock_alloc(len, SMP_CACHE_BYTES);
620 if (!static_command_line)
621 panic("%s: Failed to allocate %zu bytes\n", __func__, len);
622
623 if (xlen) {
624
625
626
627
628
629 strcpy(saved_command_line, extra_command_line);
630 strcpy(static_command_line, extra_command_line);
631 }
632 strcpy(saved_command_line + xlen, boot_command_line);
633 strcpy(static_command_line + xlen, command_line);
634
635 if (ilen) {
636
637
638
639
640
641 len = strlen(saved_command_line);
642 if (initargs_found) {
643 saved_command_line[len++] = ' ';
644 } else {
645 strcpy(saved_command_line + len, " -- ");
646 len += 4;
647 }
648
649 strcpy(saved_command_line + len, extra_init_args);
650 }
651}
652
653
654
655
656
657
658
659
660
661
662static __initdata DECLARE_COMPLETION(kthreadd_done);
663
664noinline void __ref rest_init(void)
665{
666 struct task_struct *tsk;
667 int pid;
668
669 rcu_scheduler_starting();
670
671
672
673
674
675 pid = kernel_thread(kernel_init, NULL, CLONE_FS);
676
677
678
679
680
681 rcu_read_lock();
682 tsk = find_task_by_pid_ns(pid, &init_pid_ns);
683 set_cpus_allowed_ptr(tsk, cpumask_of(smp_processor_id()));
684 rcu_read_unlock();
685
686 numa_default_policy();
687 pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES);
688 rcu_read_lock();
689 kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns);
690 rcu_read_unlock();
691
692
693
694
695
696
697
698
699 system_state = SYSTEM_SCHEDULING;
700
701 complete(&kthreadd_done);
702
703
704
705
706
707 schedule_preempt_disabled();
708
709 cpu_startup_entry(CPUHP_ONLINE);
710}
711
712
713static int __init do_early_param(char *param, char *val,
714 const char *unused, void *arg)
715{
716 const struct obs_kernel_param *p;
717
718 for (p = __setup_start; p < __setup_end; p++) {
719 if ((p->early && parameq(param, p->str)) ||
720 (strcmp(param, "console") == 0 &&
721 strcmp(p->str, "earlycon") == 0)
722 ) {
723 if (p->setup_func(val) != 0)
724 pr_warn("Malformed early option '%s'\n", param);
725 }
726 }
727
728 return 0;
729}
730
731void __init parse_early_options(char *cmdline)
732{
733 parse_args("early options", cmdline, NULL, 0, 0, 0, NULL,
734 do_early_param);
735}
736
737
738void __init parse_early_param(void)
739{
740 static int done __initdata;
741 static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata;
742
743 if (done)
744 return;
745
746
747 strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
748 parse_early_options(tmp_cmdline);
749 done = 1;
750}
751
752void __init __weak arch_post_acpi_subsys_init(void) { }
753
754void __init __weak smp_setup_processor_id(void)
755{
756}
757
758# if THREAD_SIZE >= PAGE_SIZE
759void __init __weak thread_stack_cache_init(void)
760{
761}
762#endif
763
764void __init __weak mem_encrypt_init(void) { }
765
766void __init __weak poking_init(void) { }
767
768void __init __weak pgtable_cache_init(void) { }
769
770bool initcall_debug;
771core_param(initcall_debug, initcall_debug, bool, 0644);
772
773#ifdef TRACEPOINTS_ENABLED
774static void __init initcall_debug_enable(void);
775#else
776static inline void initcall_debug_enable(void)
777{
778}
779#endif
780
781
782static void __init report_meminit(void)
783{
784 const char *stack;
785
786 if (IS_ENABLED(CONFIG_INIT_STACK_ALL_PATTERN))
787 stack = "all(pattern)";
788 else if (IS_ENABLED(CONFIG_INIT_STACK_ALL_ZERO))
789 stack = "all(zero)";
790 else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL))
791 stack = "byref_all(zero)";
792 else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF))
793 stack = "byref(zero)";
794 else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_USER))
795 stack = "__user(zero)";
796 else
797 stack = "off";
798
799 pr_info("mem auto-init: stack:%s, heap alloc:%s, heap free:%s\n",
800 stack, want_init_on_alloc(GFP_KERNEL) ? "on" : "off",
801 want_init_on_free() ? "on" : "off");
802 if (want_init_on_free())
803 pr_info("mem auto-init: clearing system memory may take some time...\n");
804}
805
806
807
808
809static void __init mm_init(void)
810{
811
812
813
814
815 page_ext_init_flatmem();
816 init_debug_pagealloc();
817 report_meminit();
818 mem_init();
819 kmem_cache_init();
820 kmemleak_init();
821 pgtable_init();
822 debug_objects_mem_init();
823 vmalloc_init();
824 ioremap_huge_init();
825
826 init_espfix_bsp();
827
828 pti_init();
829}
830
831void __init __weak arch_call_rest_init(void)
832{
833 rest_init();
834}
835
836asmlinkage __visible void __init __no_sanitize_address start_kernel(void)
837{
838 char *command_line;
839 char *after_dashes;
840
841 set_task_stack_end_magic(&init_task);
842 smp_setup_processor_id();
843 debug_objects_early_init();
844
845 cgroup_init_early();
846
847 local_irq_disable();
848 early_boot_irqs_disabled = true;
849
850
851
852
853
854 boot_cpu_init();
855 page_address_init();
856 pr_notice("%s", linux_banner);
857 early_security_init();
858 setup_arch(&command_line);
859 setup_boot_config(command_line);
860 setup_command_line(command_line);
861 setup_nr_cpu_ids();
862 setup_per_cpu_areas();
863 smp_prepare_boot_cpu();
864 boot_cpu_hotplug_init();
865
866 build_all_zonelists(NULL);
867 page_alloc_init();
868
869 pr_notice("Kernel command line: %s\n", saved_command_line);
870
871 jump_label_init();
872 parse_early_param();
873 after_dashes = parse_args("Booting kernel",
874 static_command_line, __start___param,
875 __stop___param - __start___param,
876 -1, -1, NULL, &unknown_bootoption);
877 if (!IS_ERR_OR_NULL(after_dashes))
878 parse_args("Setting init args", after_dashes, NULL, 0, -1, -1,
879 NULL, set_init_arg);
880 if (extra_init_args)
881 parse_args("Setting extra init args", extra_init_args,
882 NULL, 0, -1, -1, NULL, set_init_arg);
883
884
885
886
887
888 setup_log_buf(0);
889 vfs_caches_init_early();
890 sort_main_extable();
891 trap_init();
892 mm_init();
893
894 ftrace_init();
895
896
897 early_trace_init();
898
899
900
901
902
903
904 sched_init();
905
906
907
908
909 preempt_disable();
910 if (WARN(!irqs_disabled(),
911 "Interrupts were enabled *very* early, fixing it\n"))
912 local_irq_disable();
913 radix_tree_init();
914
915
916
917
918
919 housekeeping_init();
920
921
922
923
924
925
926 workqueue_init_early();
927
928 rcu_init();
929
930
931 trace_init();
932
933 if (initcall_debug)
934 initcall_debug_enable();
935
936 context_tracking_init();
937
938 early_irq_init();
939 init_IRQ();
940 tick_init();
941 rcu_init_nohz();
942 init_timers();
943 hrtimers_init();
944 softirq_init();
945 timekeeping_init();
946
947
948
949
950
951
952
953
954
955 rand_initialize();
956 add_latent_entropy();
957 add_device_randomness(command_line, strlen(command_line));
958 boot_init_stack_canary();
959
960 time_init();
961 perf_event_init();
962 profile_init();
963 call_function_init();
964 WARN(!irqs_disabled(), "Interrupts were enabled early\n");
965
966 early_boot_irqs_disabled = false;
967 local_irq_enable();
968
969 kmem_cache_init_late();
970
971
972
973
974
975
976 console_init();
977 if (panic_later)
978 panic("Too many boot %s vars at `%s'", panic_later,
979 panic_param);
980
981 lockdep_init();
982
983
984
985
986
987
988 locking_selftest();
989
990
991
992
993
994
995
996 mem_encrypt_init();
997
998#ifdef CONFIG_BLK_DEV_INITRD
999 if (initrd_start && !initrd_below_start_ok &&
1000 page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) {
1001 pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n",
1002 page_to_pfn(virt_to_page((void *)initrd_start)),
1003 min_low_pfn);
1004 initrd_start = 0;
1005 }
1006#endif
1007 setup_per_cpu_pageset();
1008 numa_policy_init();
1009 acpi_early_init();
1010 if (late_time_init)
1011 late_time_init();
1012 sched_clock_init();
1013 calibrate_delay();
1014 pid_idr_init();
1015 anon_vma_init();
1016#ifdef CONFIG_X86
1017 if (efi_enabled(EFI_RUNTIME_SERVICES))
1018 efi_enter_virtual_mode();
1019#endif
1020 thread_stack_cache_init();
1021 cred_init();
1022 fork_init();
1023 proc_caches_init();
1024 uts_ns_init();
1025 buffer_init();
1026 key_init();
1027 security_init();
1028 dbg_late_init();
1029 vfs_caches_init();
1030 pagecache_init();
1031 signals_init();
1032 seq_file_init();
1033 proc_root_init();
1034 nsfs_init();
1035 cpuset_init();
1036 cgroup_init();
1037 taskstats_init_early();
1038 delayacct_init();
1039
1040 poking_init();
1041 check_bugs();
1042
1043 acpi_subsystem_init();
1044 arch_post_acpi_subsys_init();
1045 sfi_init_late();
1046 kcsan_init();
1047
1048
1049 arch_call_rest_init();
1050
1051 prevent_tail_call_optimization();
1052}
1053
1054
1055static void __init do_ctors(void)
1056{
1057#ifdef CONFIG_CONSTRUCTORS
1058 ctor_fn_t *fn = (ctor_fn_t *) __ctors_start;
1059
1060 for (; fn < (ctor_fn_t *) __ctors_end; fn++)
1061 (*fn)();
1062#endif
1063}
1064
1065#ifdef CONFIG_KALLSYMS
1066struct blacklist_entry {
1067 struct list_head next;
1068 char *buf;
1069};
1070
1071static __initdata_or_module LIST_HEAD(blacklisted_initcalls);
1072
1073static int __init initcall_blacklist(char *str)
1074{
1075 char *str_entry;
1076 struct blacklist_entry *entry;
1077
1078
1079 do {
1080 str_entry = strsep(&str, ",");
1081 if (str_entry) {
1082 pr_debug("blacklisting initcall %s\n", str_entry);
1083 entry = memblock_alloc(sizeof(*entry),
1084 SMP_CACHE_BYTES);
1085 if (!entry)
1086 panic("%s: Failed to allocate %zu bytes\n",
1087 __func__, sizeof(*entry));
1088 entry->buf = memblock_alloc(strlen(str_entry) + 1,
1089 SMP_CACHE_BYTES);
1090 if (!entry->buf)
1091 panic("%s: Failed to allocate %zu bytes\n",
1092 __func__, strlen(str_entry) + 1);
1093 strcpy(entry->buf, str_entry);
1094 list_add(&entry->next, &blacklisted_initcalls);
1095 }
1096 } while (str_entry);
1097
1098 return 0;
1099}
1100
1101static bool __init_or_module initcall_blacklisted(initcall_t fn)
1102{
1103 struct blacklist_entry *entry;
1104 char fn_name[KSYM_SYMBOL_LEN];
1105 unsigned long addr;
1106
1107 if (list_empty(&blacklisted_initcalls))
1108 return false;
1109
1110 addr = (unsigned long) dereference_function_descriptor(fn);
1111 sprint_symbol_no_offset(fn_name, addr);
1112
1113
1114
1115
1116
1117 strreplace(fn_name, ' ', '\0');
1118
1119 list_for_each_entry(entry, &blacklisted_initcalls, next) {
1120 if (!strcmp(fn_name, entry->buf)) {
1121 pr_debug("initcall %s blacklisted\n", fn_name);
1122 return true;
1123 }
1124 }
1125
1126 return false;
1127}
1128#else
1129static int __init initcall_blacklist(char *str)
1130{
1131 pr_warn("initcall_blacklist requires CONFIG_KALLSYMS\n");
1132 return 0;
1133}
1134
1135static bool __init_or_module initcall_blacklisted(initcall_t fn)
1136{
1137 return false;
1138}
1139#endif
1140__setup("initcall_blacklist=", initcall_blacklist);
1141
1142static __init_or_module void
1143trace_initcall_start_cb(void *data, initcall_t fn)
1144{
1145 ktime_t *calltime = (ktime_t *)data;
1146
1147 printk(KERN_DEBUG "calling %pS @ %i\n", fn, task_pid_nr(current));
1148 *calltime = ktime_get();
1149}
1150
1151static __init_or_module void
1152trace_initcall_finish_cb(void *data, initcall_t fn, int ret)
1153{
1154 ktime_t *calltime = (ktime_t *)data;
1155 ktime_t delta, rettime;
1156 unsigned long long duration;
1157
1158 rettime = ktime_get();
1159 delta = ktime_sub(rettime, *calltime);
1160 duration = (unsigned long long) ktime_to_ns(delta) >> 10;
1161 printk(KERN_DEBUG "initcall %pS returned %d after %lld usecs\n",
1162 fn, ret, duration);
1163}
1164
1165static ktime_t initcall_calltime;
1166
1167#ifdef TRACEPOINTS_ENABLED
1168static void __init initcall_debug_enable(void)
1169{
1170 int ret;
1171
1172 ret = register_trace_initcall_start(trace_initcall_start_cb,
1173 &initcall_calltime);
1174 ret |= register_trace_initcall_finish(trace_initcall_finish_cb,
1175 &initcall_calltime);
1176 WARN(ret, "Failed to register initcall tracepoints\n");
1177}
1178# define do_trace_initcall_start trace_initcall_start
1179# define do_trace_initcall_finish trace_initcall_finish
1180#else
1181static inline void do_trace_initcall_start(initcall_t fn)
1182{
1183 if (!initcall_debug)
1184 return;
1185 trace_initcall_start_cb(&initcall_calltime, fn);
1186}
1187static inline void do_trace_initcall_finish(initcall_t fn, int ret)
1188{
1189 if (!initcall_debug)
1190 return;
1191 trace_initcall_finish_cb(&initcall_calltime, fn, ret);
1192}
1193#endif
1194
1195int __init_or_module do_one_initcall(initcall_t fn)
1196{
1197 int count = preempt_count();
1198 char msgbuf[64];
1199 int ret;
1200
1201 if (initcall_blacklisted(fn))
1202 return -EPERM;
1203
1204 do_trace_initcall_start(fn);
1205 ret = fn();
1206 do_trace_initcall_finish(fn, ret);
1207
1208 msgbuf[0] = 0;
1209
1210 if (preempt_count() != count) {
1211 sprintf(msgbuf, "preemption imbalance ");
1212 preempt_count_set(count);
1213 }
1214 if (irqs_disabled()) {
1215 strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf));
1216 local_irq_enable();
1217 }
1218 WARN(msgbuf[0], "initcall %pS returned with %s\n", fn, msgbuf);
1219
1220 add_latent_entropy();
1221 return ret;
1222}
1223
1224
1225extern initcall_entry_t __initcall_start[];
1226extern initcall_entry_t __initcall0_start[];
1227extern initcall_entry_t __initcall1_start[];
1228extern initcall_entry_t __initcall2_start[];
1229extern initcall_entry_t __initcall3_start[];
1230extern initcall_entry_t __initcall4_start[];
1231extern initcall_entry_t __initcall5_start[];
1232extern initcall_entry_t __initcall6_start[];
1233extern initcall_entry_t __initcall7_start[];
1234extern initcall_entry_t __initcall_end[];
1235
1236static initcall_entry_t *initcall_levels[] __initdata = {
1237 __initcall0_start,
1238 __initcall1_start,
1239 __initcall2_start,
1240 __initcall3_start,
1241 __initcall4_start,
1242 __initcall5_start,
1243 __initcall6_start,
1244 __initcall7_start,
1245 __initcall_end,
1246};
1247
1248
1249static const char *initcall_level_names[] __initdata = {
1250 "pure",
1251 "core",
1252 "postcore",
1253 "arch",
1254 "subsys",
1255 "fs",
1256 "device",
1257 "late",
1258};
1259
1260static int __init ignore_unknown_bootoption(char *param, char *val,
1261 const char *unused, void *arg)
1262{
1263 return 0;
1264}
1265
1266static void __init do_initcall_level(int level, char *command_line)
1267{
1268 initcall_entry_t *fn;
1269
1270 parse_args(initcall_level_names[level],
1271 command_line, __start___param,
1272 __stop___param - __start___param,
1273 level, level,
1274 NULL, ignore_unknown_bootoption);
1275
1276 trace_initcall_level(initcall_level_names[level]);
1277 for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++)
1278 do_one_initcall(initcall_from_entry(fn));
1279}
1280
1281static void __init do_initcalls(void)
1282{
1283 int level;
1284 size_t len = strlen(saved_command_line) + 1;
1285 char *command_line;
1286
1287 command_line = kzalloc(len, GFP_KERNEL);
1288 if (!command_line)
1289 panic("%s: Failed to allocate %zu bytes\n", __func__, len);
1290
1291 for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) {
1292
1293 strcpy(command_line, saved_command_line);
1294 do_initcall_level(level, command_line);
1295 }
1296
1297 kfree(command_line);
1298}
1299
1300
1301
1302
1303
1304
1305
1306
1307static void __init do_basic_setup(void)
1308{
1309 cpuset_init_smp();
1310 driver_init();
1311 init_irq_proc();
1312 do_ctors();
1313 usermodehelper_enable();
1314 do_initcalls();
1315}
1316
1317static void __init do_pre_smp_initcalls(void)
1318{
1319 initcall_entry_t *fn;
1320
1321 trace_initcall_level("early");
1322 for (fn = __initcall_start; fn < __initcall0_start; fn++)
1323 do_one_initcall(initcall_from_entry(fn));
1324}
1325
1326static int run_init_process(const char *init_filename)
1327{
1328 const char *const *p;
1329
1330 argv_init[0] = init_filename;
1331 pr_info("Run %s as init process\n", init_filename);
1332 pr_debug(" with arguments:\n");
1333 for (p = argv_init; *p; p++)
1334 pr_debug(" %s\n", *p);
1335 pr_debug(" with environment:\n");
1336 for (p = envp_init; *p; p++)
1337 pr_debug(" %s\n", *p);
1338 return kernel_execve(init_filename, argv_init, envp_init);
1339}
1340
1341static int try_to_run_init_process(const char *init_filename)
1342{
1343 int ret;
1344
1345 ret = run_init_process(init_filename);
1346
1347 if (ret && ret != -ENOENT) {
1348 pr_err("Starting init: %s exists but couldn't execute it (error %d)\n",
1349 init_filename, ret);
1350 }
1351
1352 return ret;
1353}
1354
1355static noinline void __init kernel_init_freeable(void);
1356
1357#if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX)
1358bool rodata_enabled __ro_after_init = true;
1359static int __init set_debug_rodata(char *str)
1360{
1361 return strtobool(str, &rodata_enabled);
1362}
1363__setup("rodata=", set_debug_rodata);
1364#endif
1365
1366#ifdef CONFIG_STRICT_KERNEL_RWX
1367static void mark_readonly(void)
1368{
1369 if (rodata_enabled) {
1370
1371
1372
1373
1374
1375
1376 rcu_barrier();
1377 mark_rodata_ro();
1378 rodata_test();
1379 } else
1380 pr_info("Kernel memory protection disabled.\n");
1381}
1382#elif defined(CONFIG_ARCH_HAS_STRICT_KERNEL_RWX)
1383static inline void mark_readonly(void)
1384{
1385 pr_warn("Kernel memory protection not selected by kernel config.\n");
1386}
1387#else
1388static inline void mark_readonly(void)
1389{
1390 pr_warn("This architecture does not have kernel memory protection.\n");
1391}
1392#endif
1393
1394void __weak free_initmem(void)
1395{
1396 free_initmem_default(POISON_FREE_INITMEM);
1397}
1398
1399static int __ref kernel_init(void *unused)
1400{
1401 int ret;
1402
1403 kernel_init_freeable();
1404
1405 async_synchronize_full();
1406 kprobe_free_init_mem();
1407 ftrace_free_init_mem();
1408 free_initmem();
1409 mark_readonly();
1410
1411
1412
1413
1414
1415 pti_finalize();
1416
1417 system_state = SYSTEM_RUNNING;
1418 numa_default_policy();
1419
1420 rcu_end_inkernel_boot();
1421
1422 do_sysctl_args();
1423
1424 if (ramdisk_execute_command) {
1425 ret = run_init_process(ramdisk_execute_command);
1426 if (!ret)
1427 return 0;
1428 pr_err("Failed to execute %s (error %d)\n",
1429 ramdisk_execute_command, ret);
1430 }
1431
1432
1433
1434
1435
1436
1437
1438 if (execute_command) {
1439 ret = run_init_process(execute_command);
1440 if (!ret)
1441 return 0;
1442 panic("Requested init %s failed (error %d).",
1443 execute_command, ret);
1444 }
1445
1446 if (CONFIG_DEFAULT_INIT[0] != '\0') {
1447 ret = run_init_process(CONFIG_DEFAULT_INIT);
1448 if (ret)
1449 pr_err("Default init %s failed (error %d)\n",
1450 CONFIG_DEFAULT_INIT, ret);
1451 else
1452 return 0;
1453 }
1454
1455 if (!try_to_run_init_process("/sbin/init") ||
1456 !try_to_run_init_process("/etc/init") ||
1457 !try_to_run_init_process("/bin/init") ||
1458 !try_to_run_init_process("/bin/sh"))
1459 return 0;
1460
1461 panic("No working init found. Try passing init= option to kernel. "
1462 "See Linux Documentation/admin-guide/init.rst for guidance.");
1463}
1464
1465
1466void __init console_on_rootfs(void)
1467{
1468 struct file *file = filp_open("/dev/console", O_RDWR, 0);
1469
1470 if (IS_ERR(file)) {
1471 pr_err("Warning: unable to open an initial console.\n");
1472 return;
1473 }
1474 init_dup(file);
1475 init_dup(file);
1476 init_dup(file);
1477 fput(file);
1478}
1479
1480static noinline void __init kernel_init_freeable(void)
1481{
1482
1483
1484
1485 wait_for_completion(&kthreadd_done);
1486
1487
1488 gfp_allowed_mask = __GFP_BITS_MASK;
1489
1490
1491
1492
1493 set_mems_allowed(node_states[N_MEMORY]);
1494
1495 cad_pid = task_pid(current);
1496
1497 smp_prepare_cpus(setup_max_cpus);
1498
1499 workqueue_init();
1500
1501 init_mm_internals();
1502
1503 do_pre_smp_initcalls();
1504 lockup_detector_init();
1505
1506 smp_init();
1507 sched_init_smp();
1508
1509 padata_init();
1510 page_alloc_init_late();
1511
1512 page_ext_init();
1513
1514 do_basic_setup();
1515
1516 console_on_rootfs();
1517
1518
1519
1520
1521
1522 if (init_eaccess(ramdisk_execute_command) != 0) {
1523 ramdisk_execute_command = NULL;
1524 prepare_namespace();
1525 }
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536 integrity_load_keys();
1537}
1538