Line data Source code
1 : // SPDX-License-Identifier: GPL-2.0-only
2 : /*
3 : * linux/init/main.c
4 : *
5 : * Copyright (C) 1991, 1992 Linus Torvalds
6 : *
7 : * GK 2/5/95 - Changed to support mounting root fs via NFS
8 : * Added initrd & change_root: Werner Almesberger & Hans Lermen, Feb '96
9 : * Moan early if gcc is old, avoiding bogus kernels - Paul Gortmaker, May '96
10 : * Simplified starting of init: Michael A. Griffith <grif@acm.org>
11 : */
12 :
13 : #define DEBUG /* Enable initcall_debug */
14 :
15 : #include <linux/types.h>
16 : #include <linux/extable.h>
17 : #include <linux/module.h>
18 : #include <linux/proc_fs.h>
19 : #include <linux/binfmts.h>
20 : #include <linux/kernel.h>
21 : #include <linux/syscalls.h>
22 : #include <linux/stackprotector.h>
23 : #include <linux/string.h>
24 : #include <linux/ctype.h>
25 : #include <linux/delay.h>
26 : #include <linux/ioport.h>
27 : #include <linux/init.h>
28 : #include <linux/initrd.h>
29 : #include <linux/memblock.h>
30 : #include <linux/acpi.h>
31 : #include <linux/bootconfig.h>
32 : #include <linux/console.h>
33 : #include <linux/nmi.h>
34 : #include <linux/percpu.h>
35 : #include <linux/kmod.h>
36 : #include <linux/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/srcu.h>
46 : #include <linux/moduleparam.h>
47 : #include <linux/kallsyms.h>
48 : #include <linux/buildid.h>
49 : #include <linux/writeback.h>
50 : #include <linux/cpu.h>
51 : #include <linux/cpuset.h>
52 : #include <linux/cgroup.h>
53 : #include <linux/efi.h>
54 : #include <linux/tick.h>
55 : #include <linux/sched/isolation.h>
56 : #include <linux/interrupt.h>
57 : #include <linux/taskstats_kern.h>
58 : #include <linux/delayacct.h>
59 : #include <linux/unistd.h>
60 : #include <linux/utsname.h>
61 : #include <linux/rmap.h>
62 : #include <linux/mempolicy.h>
63 : #include <linux/key.h>
64 : #include <linux/page_ext.h>
65 : #include <linux/debug_locks.h>
66 : #include <linux/debugobjects.h>
67 : #include <linux/lockdep.h>
68 : #include <linux/kmemleak.h>
69 : #include <linux/padata.h>
70 : #include <linux/pid_namespace.h>
71 : #include <linux/device/driver.h>
72 : #include <linux/kthread.h>
73 : #include <linux/sched.h>
74 : #include <linux/sched/init.h>
75 : #include <linux/signal.h>
76 : #include <linux/idr.h>
77 : #include <linux/kgdb.h>
78 : #include <linux/ftrace.h>
79 : #include <linux/async.h>
80 : #include <linux/shmem_fs.h>
81 : #include <linux/slab.h>
82 : #include <linux/perf_event.h>
83 : #include <linux/ptrace.h>
84 : #include <linux/pti.h>
85 : #include <linux/blkdev.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 : #include <linux/stackdepot.h>
102 : #include <net/net_namespace.h>
103 :
104 : #include <asm/io.h>
105 : #include <asm/bugs.h>
106 : #include <asm/setup.h>
107 : #include <asm/sections.h>
108 : #include <asm/cacheflush.h>
109 :
110 : #define CREATE_TRACE_POINTS
111 : #include <trace/events/initcall.h>
112 :
113 : #include <kunit/test.h>
114 :
115 : static int kernel_init(void *);
116 :
117 : extern void init_IRQ(void);
118 : extern void radix_tree_init(void);
119 :
120 : /*
121 : * Debug helper: via this flag we know that we are in 'early bootup code'
122 : * where only the boot processor is running with IRQ disabled. This means
123 : * two things - IRQ must not be enabled before the flag is cleared and some
124 : * operations which are not allowed with IRQ disabled are allowed while the
125 : * flag is set.
126 : */
127 : bool early_boot_irqs_disabled __read_mostly;
128 :
129 : enum system_states system_state __read_mostly;
130 : EXPORT_SYMBOL(system_state);
131 :
132 : /*
133 : * Boot command-line arguments
134 : */
135 : #define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT
136 : #define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT
137 :
138 : extern void time_init(void);
139 : /* Default late time init is NULL. archs can override this later. */
140 : void (*__initdata late_time_init)(void);
141 :
142 : /* Untouched command line saved by arch-specific code. */
143 : char __initdata boot_command_line[COMMAND_LINE_SIZE];
144 : /* Untouched saved command line (eg. for /proc) */
145 : char *saved_command_line;
146 : /* Command line for parameter parsing */
147 : static char *static_command_line;
148 : /* Untouched extra command line */
149 : static char *extra_command_line;
150 : /* Extra init arguments */
151 : static char *extra_init_args;
152 :
153 : #ifdef CONFIG_BOOT_CONFIG
154 : /* Is bootconfig on command line? */
155 : static bool bootconfig_found;
156 : static size_t initargs_offs;
157 : #else
158 : # define bootconfig_found false
159 : # define initargs_offs 0
160 : #endif
161 :
162 : static char *execute_command;
163 : static char *ramdisk_execute_command = "/init";
164 :
165 : /*
166 : * Used to generate warnings if static_key manipulation functions are used
167 : * before jump_label_init is called.
168 : */
169 : bool static_key_initialized __read_mostly;
170 : EXPORT_SYMBOL_GPL(static_key_initialized);
171 :
172 : /*
173 : * If set, this is an indication to the drivers that reset the underlying
174 : * device before going ahead with the initialization otherwise driver might
175 : * rely on the BIOS and skip the reset operation.
176 : *
177 : * This is useful if kernel is booting in an unreliable environment.
178 : * For ex. kdump situation where previous kernel has crashed, BIOS has been
179 : * skipped and devices will be in unknown state.
180 : */
181 : unsigned int reset_devices;
182 : EXPORT_SYMBOL(reset_devices);
183 :
184 0 : static int __init set_reset_devices(char *str)
185 : {
186 0 : reset_devices = 1;
187 0 : return 1;
188 : }
189 :
190 : __setup("reset_devices", set_reset_devices);
191 :
192 : static const char *argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };
193 : const char *envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, };
194 : static const char *panic_later, *panic_param;
195 :
196 : extern const struct obs_kernel_param __setup_start[], __setup_end[];
197 :
198 3 : static bool __init obsolete_checksetup(char *line)
199 : {
200 : const struct obs_kernel_param *p;
201 3 : bool had_early_param = false;
202 :
203 3 : p = __setup_start;
204 : do {
205 130 : int n = strlen(p->str);
206 130 : if (parameqn(line, p->str, n)) {
207 3 : if (p->early) {
208 : /* Already done in parse_early_param?
209 : * (Needs exact match on param part).
210 : * Keep iterating, as we can have early
211 : * params and __setups of same names 8( */
212 0 : if (line[n] == '\0' || line[n] == '=')
213 0 : had_early_param = true;
214 3 : } else if (!p->setup_func) {
215 0 : pr_warn("Parameter %s is obsolete, ignored\n",
216 : p->str);
217 0 : return true;
218 3 : } else if (p->setup_func(line + n))
219 : return true;
220 : }
221 128 : p++;
222 128 : } while (p < __setup_end);
223 :
224 : return had_early_param;
225 : }
226 :
227 : /*
228 : * This should be approx 2 Bo*oMips to start (note initial shift), and will
229 : * still work even if initially too large, it will just take slightly longer
230 : */
231 : unsigned long loops_per_jiffy = (1<<12);
232 : EXPORT_SYMBOL(loops_per_jiffy);
233 :
234 0 : static int __init debug_kernel(char *str)
235 : {
236 0 : console_loglevel = CONSOLE_LOGLEVEL_DEBUG;
237 0 : return 0;
238 : }
239 :
240 0 : static int __init quiet_kernel(char *str)
241 : {
242 0 : console_loglevel = CONSOLE_LOGLEVEL_QUIET;
243 0 : return 0;
244 : }
245 :
246 : early_param("debug", debug_kernel);
247 : early_param("quiet", quiet_kernel);
248 :
249 0 : static int __init loglevel(char *str)
250 : {
251 : int newlevel;
252 :
253 : /*
254 : * Only update loglevel value when a correct setting was passed,
255 : * to prevent blind crashes (when loglevel being set to 0) that
256 : * are quite hard to debug
257 : */
258 0 : if (get_option(&str, &newlevel)) {
259 0 : console_loglevel = newlevel;
260 0 : return 0;
261 : }
262 :
263 : return -EINVAL;
264 : }
265 :
266 : early_param("loglevel", loglevel);
267 :
268 : #ifdef CONFIG_BLK_DEV_INITRD
269 : static void * __init get_boot_config_from_initrd(u32 *_size, u32 *_csum)
270 : {
271 : u32 size, csum;
272 : char *data;
273 : u32 *hdr;
274 : int i;
275 :
276 : if (!initrd_end)
277 : return NULL;
278 :
279 : data = (char *)initrd_end - BOOTCONFIG_MAGIC_LEN;
280 : /*
281 : * Since Grub may align the size of initrd to 4, we must
282 : * check the preceding 3 bytes as well.
283 : */
284 : for (i = 0; i < 4; i++) {
285 : if (!memcmp(data, BOOTCONFIG_MAGIC, BOOTCONFIG_MAGIC_LEN))
286 : goto found;
287 : data--;
288 : }
289 : return NULL;
290 :
291 : found:
292 : hdr = (u32 *)(data - 8);
293 : size = le32_to_cpu(hdr[0]);
294 : csum = le32_to_cpu(hdr[1]);
295 :
296 : data = ((void *)hdr) - size;
297 : if ((unsigned long)data < initrd_start) {
298 : pr_err("bootconfig size %d is greater than initrd size %ld\n",
299 : size, initrd_end - initrd_start);
300 : return NULL;
301 : }
302 :
303 : /* Remove bootconfig from initramfs/initrd */
304 : initrd_end = (unsigned long)data;
305 : if (_size)
306 : *_size = size;
307 : if (_csum)
308 : *_csum = csum;
309 :
310 : return data;
311 : }
312 : #else
313 : static void * __init get_boot_config_from_initrd(u32 *_size, u32 *_csum)
314 : {
315 : return NULL;
316 : }
317 : #endif
318 :
319 : #ifdef CONFIG_BOOT_CONFIG
320 :
321 : static char xbc_namebuf[XBC_KEYLEN_MAX] __initdata;
322 :
323 : #define rest(dst, end) ((end) > (dst) ? (end) - (dst) : 0)
324 :
325 : static int __init xbc_snprint_cmdline(char *buf, size_t size,
326 : struct xbc_node *root)
327 : {
328 : struct xbc_node *knode, *vnode;
329 : char *end = buf + size;
330 : const char *val;
331 : int ret;
332 :
333 : xbc_node_for_each_key_value(root, knode, val) {
334 : ret = xbc_node_compose_key_after(root, knode,
335 : xbc_namebuf, XBC_KEYLEN_MAX);
336 : if (ret < 0)
337 : return ret;
338 :
339 : vnode = xbc_node_get_child(knode);
340 : if (!vnode) {
341 : ret = snprintf(buf, rest(buf, end), "%s ", xbc_namebuf);
342 : if (ret < 0)
343 : return ret;
344 : buf += ret;
345 : continue;
346 : }
347 : xbc_array_for_each_value(vnode, val) {
348 : ret = snprintf(buf, rest(buf, end), "%s=\"%s\" ",
349 : xbc_namebuf, val);
350 : if (ret < 0)
351 : return ret;
352 : buf += ret;
353 : }
354 : }
355 :
356 : return buf - (end - size);
357 : }
358 : #undef rest
359 :
360 : /* Make an extra command line under given key word */
361 : static char * __init xbc_make_cmdline(const char *key)
362 : {
363 : struct xbc_node *root;
364 : char *new_cmdline;
365 : int ret, len = 0;
366 :
367 : root = xbc_find_node(key);
368 : if (!root)
369 : return NULL;
370 :
371 : /* Count required buffer size */
372 : len = xbc_snprint_cmdline(NULL, 0, root);
373 : if (len <= 0)
374 : return NULL;
375 :
376 : new_cmdline = memblock_alloc(len + 1, SMP_CACHE_BYTES);
377 : if (!new_cmdline) {
378 : pr_err("Failed to allocate memory for extra kernel cmdline.\n");
379 : return NULL;
380 : }
381 :
382 : ret = xbc_snprint_cmdline(new_cmdline, len + 1, root);
383 : if (ret < 0 || ret > len) {
384 : pr_err("Failed to print extra kernel cmdline.\n");
385 : memblock_free(new_cmdline, len + 1);
386 : return NULL;
387 : }
388 :
389 : return new_cmdline;
390 : }
391 :
392 : static int __init bootconfig_params(char *param, char *val,
393 : const char *unused, void *arg)
394 : {
395 : if (strcmp(param, "bootconfig") == 0) {
396 : bootconfig_found = true;
397 : }
398 : return 0;
399 : }
400 :
401 : static int __init warn_bootconfig(char *str)
402 : {
403 : /* The 'bootconfig' has been handled by bootconfig_params(). */
404 : return 0;
405 : }
406 :
407 : static void __init setup_boot_config(void)
408 : {
409 : static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata;
410 : const char *msg;
411 : int pos;
412 : u32 size, csum;
413 : char *data, *err;
414 : int ret;
415 :
416 : /* Cut out the bootconfig data even if we have no bootconfig option */
417 : data = get_boot_config_from_initrd(&size, &csum);
418 :
419 : strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
420 : err = parse_args("bootconfig", tmp_cmdline, NULL, 0, 0, 0, NULL,
421 : bootconfig_params);
422 :
423 : if (IS_ERR(err) || !bootconfig_found)
424 : return;
425 :
426 : /* parse_args() stops at the next param of '--' and returns an address */
427 : if (err)
428 : initargs_offs = err - tmp_cmdline;
429 :
430 : if (!data) {
431 : pr_err("'bootconfig' found on command line, but no bootconfig found\n");
432 : return;
433 : }
434 :
435 : if (size >= XBC_DATA_MAX) {
436 : pr_err("bootconfig size %d greater than max size %d\n",
437 : size, XBC_DATA_MAX);
438 : return;
439 : }
440 :
441 : if (xbc_calc_checksum(data, size) != csum) {
442 : pr_err("bootconfig checksum failed\n");
443 : return;
444 : }
445 :
446 : ret = xbc_init(data, size, &msg, &pos);
447 : if (ret < 0) {
448 : if (pos < 0)
449 : pr_err("Failed to init bootconfig: %s.\n", msg);
450 : else
451 : pr_err("Failed to parse bootconfig: %s at %d.\n",
452 : msg, pos);
453 : } else {
454 : xbc_get_info(&ret, NULL);
455 : pr_info("Load bootconfig: %d bytes %d nodes\n", size, ret);
456 : /* keys starting with "kernel." are passed via cmdline */
457 : extra_command_line = xbc_make_cmdline("kernel");
458 : /* Also, "init." keys are init arguments */
459 : extra_init_args = xbc_make_cmdline("init");
460 : }
461 : return;
462 : }
463 :
464 : static void __init exit_boot_config(void)
465 : {
466 : xbc_exit();
467 : }
468 :
469 : #else /* !CONFIG_BOOT_CONFIG */
470 :
471 : static void __init setup_boot_config(void)
472 : {
473 : /* Remove bootconfig data from initrd */
474 1 : get_boot_config_from_initrd(NULL, NULL);
475 : }
476 :
477 0 : static int __init warn_bootconfig(char *str)
478 : {
479 0 : pr_warn("WARNING: 'bootconfig' found on the kernel command line but CONFIG_BOOT_CONFIG is not set.\n");
480 0 : return 0;
481 : }
482 :
483 : #define exit_boot_config() do {} while (0)
484 :
485 : #endif /* CONFIG_BOOT_CONFIG */
486 :
487 : early_param("bootconfig", warn_bootconfig);
488 :
489 : /* Change NUL term back to "=", to make "param" the whole string. */
490 3 : static void __init repair_env_string(char *param, char *val)
491 : {
492 3 : if (val) {
493 : /* param=val or param="val"? */
494 3 : if (val == param+strlen(param)+1)
495 3 : val[-1] = '=';
496 0 : else if (val == param+strlen(param)+2) {
497 0 : val[-2] = '=';
498 0 : memmove(val-1, val, strlen(val)+1);
499 : } else
500 0 : BUG();
501 : }
502 3 : }
503 :
504 : /* Anything after -- gets handed straight to init. */
505 0 : static int __init set_init_arg(char *param, char *val,
506 : const char *unused, void *arg)
507 : {
508 : unsigned int i;
509 :
510 0 : if (panic_later)
511 : return 0;
512 :
513 0 : repair_env_string(param, val);
514 :
515 0 : for (i = 0; argv_init[i]; i++) {
516 0 : if (i == MAX_INIT_ARGS) {
517 0 : panic_later = "init";
518 0 : panic_param = param;
519 0 : return 0;
520 : }
521 : }
522 0 : argv_init[i] = param;
523 0 : return 0;
524 : }
525 :
526 : /*
527 : * Unknown boot options get handed to init, unless they look like
528 : * unused parameters (modprobe will find them in /proc/cmdline).
529 : */
530 3 : static int __init unknown_bootoption(char *param, char *val,
531 : const char *unused, void *arg)
532 : {
533 3 : size_t len = strlen(param);
534 :
535 3 : repair_env_string(param, val);
536 :
537 : /* Handle obsolete-style parameters */
538 3 : if (obsolete_checksetup(param))
539 : return 0;
540 :
541 : /* Unused module parameter. */
542 1 : if (strnchr(param, len, '.'))
543 : return 0;
544 :
545 1 : if (panic_later)
546 : return 0;
547 :
548 1 : if (val) {
549 : /* Environment option */
550 : unsigned int i;
551 2 : for (i = 0; envp_init[i]; i++) {
552 2 : if (i == MAX_INIT_ENVS) {
553 0 : panic_later = "env";
554 0 : panic_param = param;
555 : }
556 2 : if (!strncmp(param, envp_init[i], len+1))
557 : break;
558 : }
559 1 : envp_init[i] = param;
560 : } else {
561 : /* Command line option */
562 : unsigned int i;
563 0 : for (i = 0; argv_init[i]; i++) {
564 0 : if (i == MAX_INIT_ARGS) {
565 0 : panic_later = "init";
566 0 : panic_param = param;
567 : }
568 : }
569 0 : argv_init[i] = param;
570 : }
571 : return 0;
572 : }
573 :
574 0 : static int __init init_setup(char *str)
575 : {
576 : unsigned int i;
577 :
578 0 : execute_command = str;
579 : /*
580 : * In case LILO is going to boot us with default command line,
581 : * it prepends "auto" before the whole cmdline which makes
582 : * the shell think it should execute a script with such name.
583 : * So we ignore all arguments entered _before_ init=... [MJ]
584 : */
585 0 : for (i = 1; i < MAX_INIT_ARGS; i++)
586 0 : argv_init[i] = NULL;
587 0 : return 1;
588 : }
589 : __setup("init=", init_setup);
590 :
591 0 : static int __init rdinit_setup(char *str)
592 : {
593 : unsigned int i;
594 :
595 0 : ramdisk_execute_command = str;
596 : /* See "auto" comment in init_setup */
597 0 : for (i = 1; i < MAX_INIT_ARGS; i++)
598 0 : argv_init[i] = NULL;
599 0 : return 1;
600 : }
601 : __setup("rdinit=", rdinit_setup);
602 :
603 : #ifndef CONFIG_SMP
604 : static const unsigned int setup_max_cpus = NR_CPUS;
605 : static inline void setup_nr_cpu_ids(void) { }
606 : static inline void smp_prepare_cpus(unsigned int maxcpus) { }
607 : #endif
608 :
609 : /*
610 : * We need to store the untouched command line for future reference.
611 : * We also need to store the touched command line since the parameter
612 : * parsing is performed in place, and we should allow a component to
613 : * store reference of name/value for future reference.
614 : */
615 1 : static void __init setup_command_line(char *command_line)
616 : {
617 1 : size_t len, xlen = 0, ilen = 0;
618 :
619 1 : if (extra_command_line)
620 0 : xlen = strlen(extra_command_line);
621 1 : if (extra_init_args)
622 0 : ilen = strlen(extra_init_args) + 4; /* for " -- " */
623 :
624 1 : len = xlen + strlen(boot_command_line) + 1;
625 :
626 2 : saved_command_line = memblock_alloc(len + ilen, SMP_CACHE_BYTES);
627 1 : if (!saved_command_line)
628 0 : panic("%s: Failed to allocate %zu bytes\n", __func__, len + ilen);
629 :
630 1 : static_command_line = memblock_alloc(len, SMP_CACHE_BYTES);
631 1 : if (!static_command_line)
632 0 : panic("%s: Failed to allocate %zu bytes\n", __func__, len);
633 :
634 1 : if (xlen) {
635 : /*
636 : * We have to put extra_command_line before boot command
637 : * lines because there could be dashes (separator of init
638 : * command line) in the command lines.
639 : */
640 0 : strcpy(saved_command_line, extra_command_line);
641 0 : strcpy(static_command_line, extra_command_line);
642 : }
643 1 : strcpy(saved_command_line + xlen, boot_command_line);
644 1 : strcpy(static_command_line + xlen, command_line);
645 :
646 1 : if (ilen) {
647 : /*
648 : * Append supplemental init boot args to saved_command_line
649 : * so that user can check what command line options passed
650 : * to init.
651 : * The order should always be
652 : * " -- "[bootconfig init-param][cmdline init-param]
653 : */
654 : if (initargs_offs) {
655 : len = xlen + initargs_offs;
656 : strcpy(saved_command_line + len, extra_init_args);
657 : len += ilen - 4; /* strlen(extra_init_args) */
658 : strcpy(saved_command_line + len,
659 : boot_command_line + initargs_offs - 1);
660 : } else {
661 0 : len = strlen(saved_command_line);
662 0 : strcpy(saved_command_line + len, " -- ");
663 0 : len += 4;
664 0 : strcpy(saved_command_line + len, extra_init_args);
665 : }
666 : }
667 1 : }
668 :
669 : /*
670 : * We need to finalize in a non-__init function or else race conditions
671 : * between the root thread and the init thread may cause start_kernel to
672 : * be reaped by free_initmem before the root thread has proceeded to
673 : * cpu_idle.
674 : *
675 : * gcc-3.4 accidentally inlines this function, so use noinline.
676 : */
677 :
678 : static __initdata DECLARE_COMPLETION(kthreadd_done);
679 :
680 1 : noinline void __ref rest_init(void)
681 : {
682 : struct task_struct *tsk;
683 : int pid;
684 :
685 1 : rcu_scheduler_starting();
686 : /*
687 : * We need to spawn init first so that it obtains pid 1, however
688 : * the init task will end up wanting to create kthreads, which, if
689 : * we schedule it before we create kthreadd, will OOPS.
690 : */
691 1 : pid = kernel_thread(kernel_init, NULL, CLONE_FS);
692 : /*
693 : * Pin init on the boot CPU. Task migration is not properly working
694 : * until sched_init_smp() has been run. It will set the allowed
695 : * CPUs for init to the non isolated CPUs.
696 : */
697 : rcu_read_lock();
698 1 : tsk = find_task_by_pid_ns(pid, &init_pid_ns);
699 1 : tsk->flags |= PF_NO_SETAFFINITY;
700 2 : set_cpus_allowed_ptr(tsk, cpumask_of(smp_processor_id()));
701 : rcu_read_unlock();
702 :
703 : numa_default_policy();
704 1 : pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES);
705 : rcu_read_lock();
706 1 : kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns);
707 : rcu_read_unlock();
708 :
709 : /*
710 : * Enable might_sleep() and smp_processor_id() checks.
711 : * They cannot be enabled earlier because with CONFIG_PREEMPTION=y
712 : * kernel_thread() would trigger might_sleep() splats. With
713 : * CONFIG_PREEMPT_VOLUNTARY=y the init task might have scheduled
714 : * already, but it's stuck on the kthreadd_done completion.
715 : */
716 1 : system_state = SYSTEM_SCHEDULING;
717 :
718 1 : complete(&kthreadd_done);
719 :
720 : /*
721 : * The boot idle thread must execute schedule()
722 : * at least once to get things moving:
723 : */
724 1 : schedule_preempt_disabled();
725 : /* Call into cpu_idle with preempt disabled */
726 0 : cpu_startup_entry(CPUHP_ONLINE);
727 : }
728 :
729 : /* Check for early params. */
730 4 : static int __init do_early_param(char *param, char *val,
731 : const char *unused, void *arg)
732 : {
733 : const struct obs_kernel_param *p;
734 :
735 328 : for (p = __setup_start; p < __setup_end; p++) {
736 648 : if ((p->early && parameq(param, p->str)) ||
737 405 : (strcmp(param, "console") == 0 &&
738 81 : strcmp(p->str, "earlycon") == 0)
739 : ) {
740 0 : if (p->setup_func(val) != 0)
741 0 : pr_warn("Malformed early option '%s'\n", param);
742 : }
743 : }
744 : /* We accept everything at this stage. */
745 4 : return 0;
746 : }
747 :
748 1 : void __init parse_early_options(char *cmdline)
749 : {
750 1 : parse_args("early options", cmdline, NULL, 0, 0, 0, NULL,
751 : do_early_param);
752 1 : }
753 :
754 : /* Arch code calls this early on, or if not, just before other parsing. */
755 1 : void __init parse_early_param(void)
756 : {
757 : static int done __initdata;
758 : static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata;
759 :
760 1 : if (done)
761 : return;
762 :
763 : /* All fall through to do_early_param. */
764 1 : strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
765 1 : parse_early_options(tmp_cmdline);
766 1 : done = 1;
767 : }
768 :
769 1 : void __init __weak arch_post_acpi_subsys_init(void) { }
770 :
771 1 : void __init __weak smp_setup_processor_id(void)
772 : {
773 1 : }
774 :
775 : # if THREAD_SIZE >= PAGE_SIZE
776 1 : void __init __weak thread_stack_cache_init(void)
777 : {
778 1 : }
779 : #endif
780 :
781 1 : void __init __weak mem_encrypt_init(void) { }
782 :
783 1 : void __init __weak poking_init(void) { }
784 :
785 1 : void __init __weak pgtable_cache_init(void) { }
786 :
787 1 : void __init __weak trap_init(void) { }
788 :
789 : bool initcall_debug;
790 : core_param(initcall_debug, initcall_debug, bool, 0644);
791 :
792 : #ifdef TRACEPOINTS_ENABLED
793 : static void __init initcall_debug_enable(void);
794 : #else
795 : static inline void initcall_debug_enable(void)
796 : {
797 : }
798 : #endif
799 :
800 : /* Report memory auto-initialization states for this boot. */
801 1 : static void __init report_meminit(void)
802 : {
803 : const char *stack;
804 :
805 : if (IS_ENABLED(CONFIG_INIT_STACK_ALL_PATTERN))
806 : stack = "all(pattern)";
807 : else if (IS_ENABLED(CONFIG_INIT_STACK_ALL_ZERO))
808 : stack = "all(zero)";
809 : else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL))
810 : stack = "byref_all(zero)";
811 : else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF))
812 : stack = "byref(zero)";
813 : else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_USER))
814 : stack = "__user(zero)";
815 : else
816 1 : stack = "off";
817 :
818 2 : pr_info("mem auto-init: stack:%s, heap alloc:%s, heap free:%s\n",
819 : stack, want_init_on_alloc(GFP_KERNEL) ? "on" : "off",
820 : want_init_on_free() ? "on" : "off");
821 1 : if (want_init_on_free())
822 0 : pr_info("mem auto-init: clearing system memory may take some time...\n");
823 1 : }
824 :
825 : /*
826 : * Set up kernel memory allocators
827 : */
828 1 : static void __init mm_init(void)
829 : {
830 : /*
831 : * page_ext requires contiguous pages,
832 : * bigger than MAX_ORDER unless SPARSEMEM.
833 : */
834 : page_ext_init_flatmem();
835 1 : init_mem_debugging_and_hardening();
836 : kfence_alloc_pool();
837 1 : report_meminit();
838 : stack_depot_early_init();
839 1 : mem_init();
840 1 : mem_init_print_info();
841 1 : kmem_cache_init();
842 : /*
843 : * page_owner must be initialized after buddy is ready, and also after
844 : * slab is ready so that stack_depot_init() works properly
845 : */
846 : page_ext_init_flatmem_late();
847 : kmemleak_init();
848 : pgtable_init();
849 : debug_objects_mem_init();
850 1 : vmalloc_init();
851 : /* Should be run before the first non-init thread is created */
852 : init_espfix_bsp();
853 : /* Should be run after espfix64 is set up. */
854 : pti_init();
855 1 : }
856 :
857 : #ifdef CONFIG_RANDOMIZE_KSTACK_OFFSET
858 : DEFINE_STATIC_KEY_MAYBE_RO(CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT,
859 : randomize_kstack_offset);
860 : DEFINE_PER_CPU(u32, kstack_offset);
861 :
862 : static int __init early_randomize_kstack_offset(char *buf)
863 : {
864 : int ret;
865 : bool bool_result;
866 :
867 : ret = kstrtobool(buf, &bool_result);
868 : if (ret)
869 : return ret;
870 :
871 : if (bool_result)
872 : static_branch_enable(&randomize_kstack_offset);
873 : else
874 : static_branch_disable(&randomize_kstack_offset);
875 : return 0;
876 : }
877 : early_param("randomize_kstack_offset", early_randomize_kstack_offset);
878 : #endif
879 :
880 1 : void __init __weak arch_call_rest_init(void)
881 : {
882 1 : rest_init();
883 : }
884 :
885 1 : static void __init print_unknown_bootoptions(void)
886 : {
887 : char *unknown_options;
888 : char *end;
889 : const char *const *p;
890 : size_t len;
891 :
892 1 : if (panic_later || (!argv_init[1] && !envp_init[2]))
893 : return;
894 :
895 : /*
896 : * Determine how many options we have to print out, plus a space
897 : * before each
898 : */
899 : len = 1; /* null terminator */
900 0 : for (p = &argv_init[1]; *p; p++) {
901 0 : len++;
902 0 : len += strlen(*p);
903 : }
904 1 : for (p = &envp_init[2]; *p; p++) {
905 1 : len++;
906 1 : len += strlen(*p);
907 : }
908 :
909 1 : unknown_options = memblock_alloc(len, SMP_CACHE_BYTES);
910 1 : if (!unknown_options) {
911 0 : pr_err("%s: Failed to allocate %zu bytes\n",
912 : __func__, len);
913 0 : return;
914 : }
915 : end = unknown_options;
916 :
917 0 : for (p = &argv_init[1]; *p; p++)
918 0 : end += sprintf(end, " %s", *p);
919 1 : for (p = &envp_init[2]; *p; p++)
920 1 : end += sprintf(end, " %s", *p);
921 :
922 : /* Start at unknown_options[1] to skip the initial space */
923 1 : pr_notice("Unknown kernel command line parameters \"%s\", will be passed to user space.\n",
924 : &unknown_options[1]);
925 1 : memblock_free(unknown_options, len);
926 : }
927 :
928 1 : asmlinkage __visible void __init __no_sanitize_address start_kernel(void)
929 : {
930 : char *command_line;
931 : char *after_dashes;
932 :
933 1 : set_task_stack_end_magic(&init_task);
934 1 : smp_setup_processor_id();
935 : debug_objects_early_init();
936 : init_vmlinux_build_id();
937 :
938 : cgroup_init_early();
939 :
940 : local_irq_disable();
941 1 : early_boot_irqs_disabled = true;
942 :
943 : /*
944 : * Interrupts are still disabled. Do necessary setups, then
945 : * enable them.
946 : */
947 1 : boot_cpu_init();
948 : page_address_init();
949 1 : pr_notice("%s", linux_banner);
950 : early_security_init();
951 1 : setup_arch(&command_line);
952 : setup_boot_config();
953 1 : setup_command_line(command_line);
954 : setup_nr_cpu_ids();
955 1 : setup_per_cpu_areas();
956 : smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */
957 1 : boot_cpu_hotplug_init();
958 :
959 1 : build_all_zonelists(NULL);
960 1 : page_alloc_init();
961 :
962 1 : pr_notice("Kernel command line: %s\n", saved_command_line);
963 : /* parameters may set static keys */
964 : jump_label_init();
965 1 : parse_early_param();
966 1 : after_dashes = parse_args("Booting kernel",
967 : static_command_line, __start___param,
968 1 : __stop___param - __start___param,
969 : -1, -1, NULL, &unknown_bootoption);
970 1 : print_unknown_bootoptions();
971 1 : if (!IS_ERR_OR_NULL(after_dashes))
972 0 : parse_args("Setting init args", after_dashes, NULL, 0, -1, -1,
973 : NULL, set_init_arg);
974 1 : if (extra_init_args)
975 0 : parse_args("Setting extra init args", extra_init_args,
976 : NULL, 0, -1, -1, NULL, set_init_arg);
977 :
978 : /*
979 : * These use large bootmem allocations and must precede
980 : * kmem_cache_init()
981 : */
982 1 : setup_log_buf(0);
983 1 : vfs_caches_init_early();
984 1 : sort_main_extable();
985 1 : trap_init();
986 1 : mm_init();
987 :
988 : ftrace_init();
989 :
990 : /* trace_printk can be enabled here */
991 : early_trace_init();
992 :
993 : /*
994 : * Set up the scheduler prior starting any interrupts (such as the
995 : * timer interrupt). Full topology setup happens at smp_init()
996 : * time - but meanwhile we still have a functioning scheduler.
997 : */
998 1 : sched_init();
999 :
1000 1 : if (WARN(!irqs_disabled(),
1001 : "Interrupts were enabled *very* early, fixing it\n"))
1002 : local_irq_disable();
1003 1 : radix_tree_init();
1004 :
1005 : /*
1006 : * Set up housekeeping before setting up workqueues to allow the unbound
1007 : * workqueue to take non-housekeeping into account.
1008 : */
1009 : housekeeping_init();
1010 :
1011 : /*
1012 : * Allow workqueue creation and work item queueing/cancelling
1013 : * early. Work item execution depends on kthreads and starts after
1014 : * workqueue_init().
1015 : */
1016 1 : workqueue_init_early();
1017 :
1018 1 : rcu_init();
1019 :
1020 : /* Trace events are available after this */
1021 : trace_init();
1022 :
1023 : if (initcall_debug)
1024 : initcall_debug_enable();
1025 :
1026 : context_tracking_init();
1027 : /* init some links before init_ISA_irqs() */
1028 1 : early_irq_init();
1029 1 : init_IRQ();
1030 1 : tick_init();
1031 : rcu_init_nohz();
1032 1 : init_timers();
1033 1 : srcu_init();
1034 1 : hrtimers_init();
1035 1 : softirq_init();
1036 1 : timekeeping_init();
1037 : kfence_init();
1038 :
1039 : /*
1040 : * For best initial stack canary entropy, prepare it after:
1041 : * - setup_arch() for any UEFI RNG entropy and boot cmdline access
1042 : * - timekeeping_init() for ktime entropy used in rand_initialize()
1043 : * - rand_initialize() to get any arch-specific entropy like RDRAND
1044 : * - add_latent_entropy() to get any latent entropy
1045 : * - adding command line entropy
1046 : */
1047 1 : rand_initialize();
1048 : add_latent_entropy();
1049 1 : add_device_randomness(command_line, strlen(command_line));
1050 : boot_init_stack_canary();
1051 :
1052 1 : time_init();
1053 : perf_event_init();
1054 : profile_init();
1055 : call_function_init();
1056 1 : WARN(!irqs_disabled(), "Interrupts were enabled early\n");
1057 :
1058 1 : early_boot_irqs_disabled = false;
1059 : local_irq_enable();
1060 :
1061 1 : kmem_cache_init_late();
1062 :
1063 : /*
1064 : * HACK ALERT! This is early. We're enabling the console before
1065 : * we've done PCI setups etc, and console_init() must be aware of
1066 : * this. But we do want output early, in case something goes wrong.
1067 : */
1068 1 : console_init();
1069 1 : if (panic_later)
1070 0 : panic("Too many boot %s vars at `%s'", panic_later,
1071 : panic_param);
1072 :
1073 : lockdep_init();
1074 :
1075 : /*
1076 : * Need to run this when irqs are enabled, because it wants
1077 : * to self-test [hard/soft]-irqs on/off lock inversion bugs
1078 : * too:
1079 : */
1080 : locking_selftest();
1081 :
1082 : /*
1083 : * This needs to be called before any devices perform DMA
1084 : * operations that might use the SWIOTLB bounce buffers. It will
1085 : * mark the bounce buffers as decrypted so that their usage will
1086 : * not cause "plain-text" data to be decrypted when accessed.
1087 : */
1088 1 : mem_encrypt_init();
1089 :
1090 : #ifdef CONFIG_BLK_DEV_INITRD
1091 : if (initrd_start && !initrd_below_start_ok &&
1092 : page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) {
1093 : pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n",
1094 : page_to_pfn(virt_to_page((void *)initrd_start)),
1095 : min_low_pfn);
1096 : initrd_start = 0;
1097 : }
1098 : #endif
1099 1 : setup_per_cpu_pageset();
1100 : numa_policy_init();
1101 : acpi_early_init();
1102 1 : if (late_time_init)
1103 1 : late_time_init();
1104 1 : sched_clock_init();
1105 1 : calibrate_delay();
1106 1 : pid_idr_init();
1107 1 : anon_vma_init();
1108 : #ifdef CONFIG_X86
1109 : if (efi_enabled(EFI_RUNTIME_SERVICES))
1110 : efi_enter_virtual_mode();
1111 : #endif
1112 1 : thread_stack_cache_init();
1113 1 : cred_init();
1114 1 : fork_init();
1115 1 : proc_caches_init();
1116 1 : uts_ns_init();
1117 : key_init();
1118 : security_init();
1119 : dbg_late_init();
1120 : net_ns_init();
1121 1 : vfs_caches_init();
1122 1 : pagecache_init();
1123 1 : signals_init();
1124 1 : seq_file_init();
1125 1 : proc_root_init();
1126 1 : nsfs_init();
1127 : cpuset_init();
1128 : cgroup_init();
1129 : taskstats_init_early();
1130 : delayacct_init();
1131 :
1132 1 : poking_init();
1133 1 : check_bugs();
1134 :
1135 : acpi_subsystem_init();
1136 1 : arch_post_acpi_subsys_init();
1137 : kcsan_init();
1138 :
1139 : /* Do the rest non-__init'ed, we're now alive */
1140 1 : arch_call_rest_init();
1141 :
1142 0 : prevent_tail_call_optimization();
1143 0 : }
1144 :
1145 : /* Call all constructor functions linked into the kernel. */
1146 : static void __init do_ctors(void)
1147 : {
1148 : /*
1149 : * For UML, the constructors have already been called by the
1150 : * normal setup code as it's just a normal ELF binary, so we
1151 : * cannot do it again - but we do need CONFIG_CONSTRUCTORS
1152 : * even on UML for modules.
1153 : */
1154 : #if defined(CONFIG_CONSTRUCTORS) && !defined(CONFIG_UML)
1155 : ctor_fn_t *fn = (ctor_fn_t *) __ctors_start;
1156 :
1157 : for (; fn < (ctor_fn_t *) __ctors_end; fn++)
1158 : (*fn)();
1159 : #endif
1160 : }
1161 :
1162 : #ifdef CONFIG_KALLSYMS
1163 : struct blacklist_entry {
1164 : struct list_head next;
1165 : char *buf;
1166 : };
1167 :
1168 : static __initdata_or_module LIST_HEAD(blacklisted_initcalls);
1169 :
1170 0 : static int __init initcall_blacklist(char *str)
1171 : {
1172 : char *str_entry;
1173 : struct blacklist_entry *entry;
1174 :
1175 : /* str argument is a comma-separated list of functions */
1176 : do {
1177 0 : str_entry = strsep(&str, ",");
1178 0 : if (str_entry) {
1179 0 : pr_debug("blacklisting initcall %s\n", str_entry);
1180 0 : entry = memblock_alloc(sizeof(*entry),
1181 : SMP_CACHE_BYTES);
1182 0 : if (!entry)
1183 0 : panic("%s: Failed to allocate %zu bytes\n",
1184 : __func__, sizeof(*entry));
1185 0 : entry->buf = memblock_alloc(strlen(str_entry) + 1,
1186 : SMP_CACHE_BYTES);
1187 0 : if (!entry->buf)
1188 0 : panic("%s: Failed to allocate %zu bytes\n",
1189 0 : __func__, strlen(str_entry) + 1);
1190 0 : strcpy(entry->buf, str_entry);
1191 0 : list_add(&entry->next, &blacklisted_initcalls);
1192 : }
1193 0 : } while (str_entry);
1194 :
1195 0 : return 1;
1196 : }
1197 :
1198 176 : static bool __init_or_module initcall_blacklisted(initcall_t fn)
1199 : {
1200 : struct blacklist_entry *entry;
1201 : char fn_name[KSYM_SYMBOL_LEN];
1202 : unsigned long addr;
1203 :
1204 176 : if (list_empty(&blacklisted_initcalls))
1205 : return false;
1206 :
1207 0 : addr = (unsigned long) dereference_function_descriptor(fn);
1208 0 : sprint_symbol_no_offset(fn_name, addr);
1209 :
1210 : /*
1211 : * fn will be "function_name [module_name]" where [module_name] is not
1212 : * displayed for built-in init functions. Strip off the [module_name].
1213 : */
1214 0 : strreplace(fn_name, ' ', '\0');
1215 :
1216 0 : list_for_each_entry(entry, &blacklisted_initcalls, next) {
1217 0 : if (!strcmp(fn_name, entry->buf)) {
1218 0 : pr_debug("initcall %s blacklisted\n", fn_name);
1219 0 : return true;
1220 : }
1221 : }
1222 :
1223 : return false;
1224 : }
1225 : #else
1226 : static int __init initcall_blacklist(char *str)
1227 : {
1228 : pr_warn("initcall_blacklist requires CONFIG_KALLSYMS\n");
1229 : return 0;
1230 : }
1231 :
1232 : static bool __init_or_module initcall_blacklisted(initcall_t fn)
1233 : {
1234 : return false;
1235 : }
1236 : #endif
1237 : __setup("initcall_blacklist=", initcall_blacklist);
1238 :
1239 : static __init_or_module void
1240 0 : trace_initcall_start_cb(void *data, initcall_t fn)
1241 : {
1242 0 : ktime_t *calltime = (ktime_t *)data;
1243 :
1244 0 : printk(KERN_DEBUG "calling %pS @ %i\n", fn, task_pid_nr(current));
1245 0 : *calltime = ktime_get();
1246 0 : }
1247 :
1248 : static __init_or_module void
1249 0 : trace_initcall_finish_cb(void *data, initcall_t fn, int ret)
1250 : {
1251 0 : ktime_t rettime, *calltime = (ktime_t *)data;
1252 :
1253 0 : rettime = ktime_get();
1254 0 : printk(KERN_DEBUG "initcall %pS returned %d after %lld usecs\n",
1255 : fn, ret, (unsigned long long)ktime_us_delta(rettime, *calltime));
1256 0 : }
1257 :
1258 : static ktime_t initcall_calltime;
1259 :
1260 : #ifdef TRACEPOINTS_ENABLED
1261 : static void __init initcall_debug_enable(void)
1262 : {
1263 : int ret;
1264 :
1265 : ret = register_trace_initcall_start(trace_initcall_start_cb,
1266 : &initcall_calltime);
1267 : ret |= register_trace_initcall_finish(trace_initcall_finish_cb,
1268 : &initcall_calltime);
1269 : WARN(ret, "Failed to register initcall tracepoints\n");
1270 : }
1271 : # define do_trace_initcall_start trace_initcall_start
1272 : # define do_trace_initcall_finish trace_initcall_finish
1273 : #else
1274 : static inline void do_trace_initcall_start(initcall_t fn)
1275 : {
1276 176 : if (!initcall_debug)
1277 : return;
1278 0 : trace_initcall_start_cb(&initcall_calltime, fn);
1279 : }
1280 : static inline void do_trace_initcall_finish(initcall_t fn, int ret)
1281 : {
1282 176 : if (!initcall_debug)
1283 : return;
1284 0 : trace_initcall_finish_cb(&initcall_calltime, fn, ret);
1285 : }
1286 : #endif /* !TRACEPOINTS_ENABLED */
1287 :
1288 176 : int __init_or_module do_one_initcall(initcall_t fn)
1289 : {
1290 176 : int count = preempt_count();
1291 : char msgbuf[64];
1292 : int ret;
1293 :
1294 176 : if (initcall_blacklisted(fn))
1295 : return -EPERM;
1296 :
1297 176 : do_trace_initcall_start(fn);
1298 176 : ret = fn();
1299 176 : do_trace_initcall_finish(fn, ret);
1300 :
1301 176 : msgbuf[0] = 0;
1302 :
1303 176 : if (preempt_count() != count) {
1304 0 : sprintf(msgbuf, "preemption imbalance ");
1305 : preempt_count_set(count);
1306 : }
1307 176 : if (irqs_disabled()) {
1308 0 : strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf));
1309 : local_irq_enable();
1310 : }
1311 176 : WARN(msgbuf[0], "initcall %pS returned with %s\n", fn, msgbuf);
1312 :
1313 : add_latent_entropy();
1314 : return ret;
1315 : }
1316 :
1317 :
1318 : extern initcall_entry_t __initcall_start[];
1319 : extern initcall_entry_t __initcall0_start[];
1320 : extern initcall_entry_t __initcall1_start[];
1321 : extern initcall_entry_t __initcall2_start[];
1322 : extern initcall_entry_t __initcall3_start[];
1323 : extern initcall_entry_t __initcall4_start[];
1324 : extern initcall_entry_t __initcall5_start[];
1325 : extern initcall_entry_t __initcall6_start[];
1326 : extern initcall_entry_t __initcall7_start[];
1327 : extern initcall_entry_t __initcall_end[];
1328 :
1329 : static initcall_entry_t *initcall_levels[] __initdata = {
1330 : __initcall0_start,
1331 : __initcall1_start,
1332 : __initcall2_start,
1333 : __initcall3_start,
1334 : __initcall4_start,
1335 : __initcall5_start,
1336 : __initcall6_start,
1337 : __initcall7_start,
1338 : __initcall_end,
1339 : };
1340 :
1341 : /* Keep these in sync with initcalls in include/linux/init.h */
1342 : static const char *initcall_level_names[] __initdata = {
1343 : "pure",
1344 : "core",
1345 : "postcore",
1346 : "arch",
1347 : "subsys",
1348 : "fs",
1349 : "device",
1350 : "late",
1351 : };
1352 :
1353 24 : static int __init ignore_unknown_bootoption(char *param, char *val,
1354 : const char *unused, void *arg)
1355 : {
1356 24 : return 0;
1357 : }
1358 :
1359 8 : static void __init do_initcall_level(int level, char *command_line)
1360 : {
1361 : initcall_entry_t *fn;
1362 :
1363 16 : parse_args(initcall_level_names[level],
1364 : command_line, __start___param,
1365 8 : __stop___param - __start___param,
1366 : level, level,
1367 : NULL, ignore_unknown_bootoption);
1368 :
1369 8 : trace_initcall_level(initcall_level_names[level]);
1370 178 : for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++)
1371 170 : do_one_initcall(initcall_from_entry(fn));
1372 8 : }
1373 :
1374 1 : static void __init do_initcalls(void)
1375 : {
1376 : int level;
1377 1 : size_t len = strlen(saved_command_line) + 1;
1378 : char *command_line;
1379 :
1380 1 : command_line = kzalloc(len, GFP_KERNEL);
1381 1 : if (!command_line)
1382 0 : panic("%s: Failed to allocate %zu bytes\n", __func__, len);
1383 :
1384 8 : for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) {
1385 : /* Parser modifies command_line, restore it each time */
1386 8 : strcpy(command_line, saved_command_line);
1387 8 : do_initcall_level(level, command_line);
1388 : }
1389 :
1390 1 : kfree(command_line);
1391 1 : }
1392 :
1393 : /*
1394 : * Ok, the machine is now initialized. None of the devices
1395 : * have been touched yet, but the CPU subsystem is up and
1396 : * running, and memory and process management works.
1397 : *
1398 : * Now we can finally start doing some real work..
1399 : */
1400 1 : static void __init do_basic_setup(void)
1401 : {
1402 : cpuset_init_smp();
1403 1 : driver_init();
1404 1 : init_irq_proc();
1405 : do_ctors();
1406 1 : do_initcalls();
1407 1 : }
1408 :
1409 1 : static void __init do_pre_smp_initcalls(void)
1410 : {
1411 : initcall_entry_t *fn;
1412 :
1413 1 : trace_initcall_level("early");
1414 7 : for (fn = __initcall_start; fn < __initcall0_start; fn++)
1415 6 : do_one_initcall(initcall_from_entry(fn));
1416 1 : }
1417 :
1418 0 : static int run_init_process(const char *init_filename)
1419 : {
1420 : const char *const *p;
1421 :
1422 0 : argv_init[0] = init_filename;
1423 0 : pr_info("Run %s as init process\n", init_filename);
1424 0 : pr_debug(" with arguments:\n");
1425 0 : for (p = argv_init; *p; p++)
1426 0 : pr_debug(" %s\n", *p);
1427 0 : pr_debug(" with environment:\n");
1428 0 : for (p = envp_init; *p; p++)
1429 0 : pr_debug(" %s\n", *p);
1430 0 : return kernel_execve(init_filename, argv_init, envp_init);
1431 : }
1432 :
1433 0 : static int try_to_run_init_process(const char *init_filename)
1434 : {
1435 : int ret;
1436 :
1437 0 : ret = run_init_process(init_filename);
1438 :
1439 0 : if (ret && ret != -ENOENT) {
1440 0 : pr_err("Starting init: %s exists but couldn't execute it (error %d)\n",
1441 : init_filename, ret);
1442 : }
1443 :
1444 0 : return ret;
1445 : }
1446 :
1447 : static noinline void __init kernel_init_freeable(void);
1448 :
1449 : #if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX)
1450 : bool rodata_enabled __ro_after_init = true;
1451 : static int __init set_debug_rodata(char *str)
1452 : {
1453 : if (strtobool(str, &rodata_enabled))
1454 : pr_warn("Invalid option string for rodata: '%s'\n", str);
1455 : return 1;
1456 : }
1457 : __setup("rodata=", set_debug_rodata);
1458 : #endif
1459 :
1460 : #ifdef CONFIG_STRICT_KERNEL_RWX
1461 : static void mark_readonly(void)
1462 : {
1463 : if (rodata_enabled) {
1464 : /*
1465 : * load_module() results in W+X mappings, which are cleaned
1466 : * up with call_rcu(). Let's make sure that queued work is
1467 : * flushed so that we don't hit false positives looking for
1468 : * insecure pages which are W+X.
1469 : */
1470 : rcu_barrier();
1471 : mark_rodata_ro();
1472 : rodata_test();
1473 : } else
1474 : pr_info("Kernel memory protection disabled.\n");
1475 : }
1476 : #elif defined(CONFIG_ARCH_HAS_STRICT_KERNEL_RWX)
1477 : static inline void mark_readonly(void)
1478 : {
1479 : pr_warn("Kernel memory protection not selected by kernel config.\n");
1480 : }
1481 : #else
1482 : static inline void mark_readonly(void)
1483 : {
1484 0 : pr_warn("This architecture does not have kernel memory protection.\n");
1485 : }
1486 : #endif
1487 :
1488 0 : void __weak free_initmem(void)
1489 : {
1490 0 : free_initmem_default(POISON_FREE_INITMEM);
1491 0 : }
1492 :
1493 1 : static int __ref kernel_init(void *unused)
1494 : {
1495 : int ret;
1496 :
1497 : /*
1498 : * Wait until kthreadd is all set-up.
1499 : */
1500 1 : wait_for_completion(&kthreadd_done);
1501 :
1502 1 : kernel_init_freeable();
1503 : /* need to finish all async __init code before freeing the memory */
1504 0 : async_synchronize_full();
1505 :
1506 0 : system_state = SYSTEM_FREEING_INITMEM;
1507 : kprobe_free_init_mem();
1508 : ftrace_free_init_mem();
1509 : kgdb_free_init_mem();
1510 : exit_boot_config();
1511 0 : free_initmem();
1512 : mark_readonly();
1513 :
1514 : /*
1515 : * Kernel mappings are now finalized - update the userspace page-table
1516 : * to finalize PTI.
1517 : */
1518 : pti_finalize();
1519 :
1520 0 : system_state = SYSTEM_RUNNING;
1521 : numa_default_policy();
1522 :
1523 : rcu_end_inkernel_boot();
1524 :
1525 0 : do_sysctl_args();
1526 :
1527 0 : if (ramdisk_execute_command) {
1528 0 : ret = run_init_process(ramdisk_execute_command);
1529 0 : if (!ret)
1530 : return 0;
1531 0 : pr_err("Failed to execute %s (error %d)\n",
1532 : ramdisk_execute_command, ret);
1533 : }
1534 :
1535 : /*
1536 : * We try each of these until one succeeds.
1537 : *
1538 : * The Bourne shell can be used instead of init if we are
1539 : * trying to recover a really broken machine.
1540 : */
1541 0 : if (execute_command) {
1542 0 : ret = run_init_process(execute_command);
1543 0 : if (!ret)
1544 : return 0;
1545 0 : panic("Requested init %s failed (error %d).",
1546 : execute_command, ret);
1547 : }
1548 :
1549 : if (CONFIG_DEFAULT_INIT[0] != '\0') {
1550 : ret = run_init_process(CONFIG_DEFAULT_INIT);
1551 : if (ret)
1552 : pr_err("Default init %s failed (error %d)\n",
1553 : CONFIG_DEFAULT_INIT, ret);
1554 : else
1555 : return 0;
1556 : }
1557 :
1558 0 : if (!try_to_run_init_process("/sbin/init") ||
1559 0 : !try_to_run_init_process("/etc/init") ||
1560 0 : !try_to_run_init_process("/bin/init") ||
1561 0 : !try_to_run_init_process("/bin/sh"))
1562 : return 0;
1563 :
1564 0 : panic("No working init found. Try passing init= option to kernel. "
1565 : "See Linux Documentation/admin-guide/init.rst for guidance.");
1566 : }
1567 :
1568 : /* Open /dev/console, for stdin/stdout/stderr, this should never fail */
1569 0 : void __init console_on_rootfs(void)
1570 : {
1571 0 : struct file *file = filp_open("/dev/console", O_RDWR, 0);
1572 :
1573 0 : if (IS_ERR(file)) {
1574 0 : pr_err("Warning: unable to open an initial console.\n");
1575 0 : return;
1576 : }
1577 0 : init_dup(file);
1578 0 : init_dup(file);
1579 0 : init_dup(file);
1580 0 : fput(file);
1581 : }
1582 :
1583 1 : static noinline void __init kernel_init_freeable(void)
1584 : {
1585 : /* Now the scheduler is fully set up and can do blocking allocations */
1586 1 : gfp_allowed_mask = __GFP_BITS_MASK;
1587 :
1588 : /*
1589 : * init can allocate pages on any node
1590 : */
1591 1 : set_mems_allowed(node_states[N_MEMORY]);
1592 :
1593 2 : cad_pid = get_pid(task_pid(current));
1594 :
1595 1 : smp_prepare_cpus(setup_max_cpus);
1596 :
1597 1 : workqueue_init();
1598 :
1599 1 : init_mm_internals();
1600 :
1601 : rcu_init_tasks_generic();
1602 1 : do_pre_smp_initcalls();
1603 : lockup_detector_init();
1604 :
1605 : smp_init();
1606 1 : sched_init_smp();
1607 :
1608 : padata_init();
1609 1 : page_alloc_init_late();
1610 : /* Initialize page ext after all struct pages are initialized. */
1611 : page_ext_init();
1612 :
1613 1 : do_basic_setup();
1614 :
1615 1 : kunit_run_all_tests();
1616 :
1617 : wait_for_initramfs();
1618 0 : console_on_rootfs();
1619 :
1620 : /*
1621 : * check if there is an early userspace init. If yes, let it do all
1622 : * the work
1623 : */
1624 0 : if (init_eaccess(ramdisk_execute_command) != 0) {
1625 0 : ramdisk_execute_command = NULL;
1626 0 : prepare_namespace();
1627 : }
1628 :
1629 : /*
1630 : * Ok, we have completed the initial bootup, and
1631 : * we're essentially up and running. Get rid of the
1632 : * initmem segments and start the user-mode stuff..
1633 : *
1634 : * rootfs is available now, try loading the public keys
1635 : * and default modules
1636 : */
1637 :
1638 : integrity_load_keys();
1639 0 : }
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