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1 | // SPDX-License-Identifier: GPL-2.0 | |
2 | #include <linux/init.h> | |
3 | #include <linux/async.h> | |
4 | #include <linux/fs.h> | |
5 | #include <linux/slab.h> | |
6 | #include <linux/types.h> | |
7 | #include <linux/fcntl.h> | |
8 | #include <linux/delay.h> | |
9 | #include <linux/string.h> | |
10 | #include <linux/dirent.h> | |
11 | #include <linux/syscalls.h> | |
12 | #include <linux/utime.h> | |
13 | #include <linux/file.h> | |
14 | #include <linux/kstrtox.h> | |
15 | #include <linux/memblock.h> | |
16 | #include <linux/mm.h> | |
17 | #include <linux/namei.h> | |
18 | #include <linux/init_syscalls.h> | |
19 | #include <linux/umh.h> | |
20 | ||
21 | #include "do_mounts.h" | |
22 | ||
23 | static __initdata bool csum_present; | |
24 | static __initdata u32 io_csum; | |
25 | ||
26 | static ssize_t __init xwrite(struct file *file, const unsigned char *p, | |
27 | size_t count, loff_t *pos) | |
28 | { | |
29 | ssize_t out = 0; | |
30 | ||
31 | /* sys_write only can write MAX_RW_COUNT aka 2G-4K bytes at most */ | |
32 | while (count) { | |
33 | ssize_t rv = kernel_write(file, p, count, pos); | |
34 | ||
35 | if (rv < 0) { | |
36 | if (rv == -EINTR || rv == -EAGAIN) | |
37 | continue; | |
38 | return out ? out : rv; | |
39 | } else if (rv == 0) | |
40 | break; | |
41 | ||
42 | if (csum_present) { | |
43 | ssize_t i; | |
44 | ||
45 | for (i = 0; i < rv; i++) | |
46 | io_csum += p[i]; | |
47 | } | |
48 | ||
49 | p += rv; | |
50 | out += rv; | |
51 | count -= rv; | |
52 | } | |
53 | ||
54 | return out; | |
55 | } | |
56 | ||
57 | static __initdata char *message; | |
58 | static void __init error(char *x) | |
59 | { | |
60 | if (!message) | |
61 | message = x; | |
62 | } | |
63 | ||
64 | #define panic_show_mem(fmt, ...) \ | |
65 | ({ show_mem(); panic(fmt, ##__VA_ARGS__); }) | |
66 | ||
67 | /* link hash */ | |
68 | ||
69 | #define N_ALIGN(len) ((((len) + 1) & ~3) + 2) | |
70 | ||
71 | static __initdata struct hash { | |
72 | int ino, minor, major; | |
73 | umode_t mode; | |
74 | struct hash *next; | |
75 | char name[N_ALIGN(PATH_MAX)]; | |
76 | } *head[32]; | |
77 | ||
78 | static inline int hash(int major, int minor, int ino) | |
79 | { | |
80 | unsigned long tmp = ino + minor + (major << 3); | |
81 | tmp += tmp >> 5; | |
82 | return tmp & 31; | |
83 | } | |
84 | ||
85 | static char __init *find_link(int major, int minor, int ino, | |
86 | umode_t mode, char *name) | |
87 | { | |
88 | struct hash **p, *q; | |
89 | for (p = head + hash(major, minor, ino); *p; p = &(*p)->next) { | |
90 | if ((*p)->ino != ino) | |
91 | continue; | |
92 | if ((*p)->minor != minor) | |
93 | continue; | |
94 | if ((*p)->major != major) | |
95 | continue; | |
96 | if (((*p)->mode ^ mode) & S_IFMT) | |
97 | continue; | |
98 | return (*p)->name; | |
99 | } | |
100 | q = kmalloc(sizeof(struct hash), GFP_KERNEL); | |
101 | if (!q) | |
102 | panic_show_mem("can't allocate link hash entry"); | |
103 | q->major = major; | |
104 | q->minor = minor; | |
105 | q->ino = ino; | |
106 | q->mode = mode; | |
107 | strcpy(q->name, name); | |
108 | q->next = NULL; | |
109 | *p = q; | |
110 | return NULL; | |
111 | } | |
112 | ||
113 | static void __init free_hash(void) | |
114 | { | |
115 | struct hash **p, *q; | |
116 | for (p = head; p < head + 32; p++) { | |
117 | while (*p) { | |
118 | q = *p; | |
119 | *p = q->next; | |
120 | kfree(q); | |
121 | } | |
122 | } | |
123 | } | |
124 | ||
125 | #ifdef CONFIG_INITRAMFS_PRESERVE_MTIME | |
126 | static void __init do_utime(char *filename, time64_t mtime) | |
127 | { | |
128 | struct timespec64 t[2] = { { .tv_sec = mtime }, { .tv_sec = mtime } }; | |
129 | init_utimes(filename, t); | |
130 | } | |
131 | ||
132 | static void __init do_utime_path(const struct path *path, time64_t mtime) | |
133 | { | |
134 | struct timespec64 t[2] = { { .tv_sec = mtime }, { .tv_sec = mtime } }; | |
135 | vfs_utimes(path, t); | |
136 | } | |
137 | ||
138 | static __initdata LIST_HEAD(dir_list); | |
139 | struct dir_entry { | |
140 | struct list_head list; | |
141 | time64_t mtime; | |
142 | char name[]; | |
143 | }; | |
144 | ||
145 | static void __init dir_add(const char *name, time64_t mtime) | |
146 | { | |
147 | size_t nlen = strlen(name) + 1; | |
148 | struct dir_entry *de; | |
149 | ||
150 | de = kmalloc(sizeof(struct dir_entry) + nlen, GFP_KERNEL); | |
151 | if (!de) | |
152 | panic_show_mem("can't allocate dir_entry buffer"); | |
153 | INIT_LIST_HEAD(&de->list); | |
154 | strscpy(de->name, name, nlen); | |
155 | de->mtime = mtime; | |
156 | list_add(&de->list, &dir_list); | |
157 | } | |
158 | ||
159 | static void __init dir_utime(void) | |
160 | { | |
161 | struct dir_entry *de, *tmp; | |
162 | list_for_each_entry_safe(de, tmp, &dir_list, list) { | |
163 | list_del(&de->list); | |
164 | do_utime(de->name, de->mtime); | |
165 | kfree(de); | |
166 | } | |
167 | } | |
168 | #else | |
169 | static void __init do_utime(char *filename, time64_t mtime) {} | |
170 | static void __init do_utime_path(const struct path *path, time64_t mtime) {} | |
171 | static void __init dir_add(const char *name, time64_t mtime) {} | |
172 | static void __init dir_utime(void) {} | |
173 | #endif | |
174 | ||
175 | static __initdata time64_t mtime; | |
176 | ||
177 | /* cpio header parsing */ | |
178 | ||
179 | static __initdata unsigned long ino, major, minor, nlink; | |
180 | static __initdata umode_t mode; | |
181 | static __initdata unsigned long body_len, name_len; | |
182 | static __initdata uid_t uid; | |
183 | static __initdata gid_t gid; | |
184 | static __initdata unsigned rdev; | |
185 | static __initdata u32 hdr_csum; | |
186 | ||
187 | static void __init parse_header(char *s) | |
188 | { | |
189 | unsigned long parsed[13]; | |
190 | char buf[9]; | |
191 | int i; | |
192 | ||
193 | buf[8] = '\0'; | |
194 | for (i = 0, s += 6; i < 13; i++, s += 8) { | |
195 | memcpy(buf, s, 8); | |
196 | parsed[i] = simple_strtoul(buf, NULL, 16); | |
197 | } | |
198 | ino = parsed[0]; | |
199 | mode = parsed[1]; | |
200 | uid = parsed[2]; | |
201 | gid = parsed[3]; | |
202 | nlink = parsed[4]; | |
203 | mtime = parsed[5]; /* breaks in y2106 */ | |
204 | body_len = parsed[6]; | |
205 | major = parsed[7]; | |
206 | minor = parsed[8]; | |
207 | rdev = new_encode_dev(MKDEV(parsed[9], parsed[10])); | |
208 | name_len = parsed[11]; | |
209 | hdr_csum = parsed[12]; | |
210 | } | |
211 | ||
212 | /* FSM */ | |
213 | ||
214 | static __initdata enum state { | |
215 | Start, | |
216 | Collect, | |
217 | GotHeader, | |
218 | SkipIt, | |
219 | GotName, | |
220 | CopyFile, | |
221 | GotSymlink, | |
222 | Reset | |
223 | } state, next_state; | |
224 | ||
225 | static __initdata char *victim; | |
226 | static unsigned long byte_count __initdata; | |
227 | static __initdata loff_t this_header, next_header; | |
228 | ||
229 | static inline void __init eat(unsigned n) | |
230 | { | |
231 | victim += n; | |
232 | this_header += n; | |
233 | byte_count -= n; | |
234 | } | |
235 | ||
236 | static __initdata char *collected; | |
237 | static long remains __initdata; | |
238 | static __initdata char *collect; | |
239 | ||
240 | static void __init read_into(char *buf, unsigned size, enum state next) | |
241 | { | |
242 | if (byte_count >= size) { | |
243 | collected = victim; | |
244 | eat(size); | |
245 | state = next; | |
246 | } else { | |
247 | collect = collected = buf; | |
248 | remains = size; | |
249 | next_state = next; | |
250 | state = Collect; | |
251 | } | |
252 | } | |
253 | ||
254 | static __initdata char *header_buf, *symlink_buf, *name_buf; | |
255 | ||
256 | static int __init do_start(void) | |
257 | { | |
258 | read_into(header_buf, 110, GotHeader); | |
259 | return 0; | |
260 | } | |
261 | ||
262 | static int __init do_collect(void) | |
263 | { | |
264 | unsigned long n = remains; | |
265 | if (byte_count < n) | |
266 | n = byte_count; | |
267 | memcpy(collect, victim, n); | |
268 | eat(n); | |
269 | collect += n; | |
270 | if ((remains -= n) != 0) | |
271 | return 1; | |
272 | state = next_state; | |
273 | return 0; | |
274 | } | |
275 | ||
276 | static int __init do_header(void) | |
277 | { | |
278 | if (!memcmp(collected, "070701", 6)) { | |
279 | csum_present = false; | |
280 | } else if (!memcmp(collected, "070702", 6)) { | |
281 | csum_present = true; | |
282 | } else { | |
283 | if (memcmp(collected, "070707", 6) == 0) | |
284 | error("incorrect cpio method used: use -H newc option"); | |
285 | else | |
286 | error("no cpio magic"); | |
287 | return 1; | |
288 | } | |
289 | parse_header(collected); | |
290 | next_header = this_header + N_ALIGN(name_len) + body_len; | |
291 | next_header = (next_header + 3) & ~3; | |
292 | state = SkipIt; | |
293 | if (name_len <= 0 || name_len > PATH_MAX) | |
294 | return 0; | |
295 | if (S_ISLNK(mode)) { | |
296 | if (body_len > PATH_MAX) | |
297 | return 0; | |
298 | collect = collected = symlink_buf; | |
299 | remains = N_ALIGN(name_len) + body_len; | |
300 | next_state = GotSymlink; | |
301 | state = Collect; | |
302 | return 0; | |
303 | } | |
304 | if (S_ISREG(mode) || !body_len) | |
305 | read_into(name_buf, N_ALIGN(name_len), GotName); | |
306 | return 0; | |
307 | } | |
308 | ||
309 | static int __init do_skip(void) | |
310 | { | |
311 | if (this_header + byte_count < next_header) { | |
312 | eat(byte_count); | |
313 | return 1; | |
314 | } else { | |
315 | eat(next_header - this_header); | |
316 | state = next_state; | |
317 | return 0; | |
318 | } | |
319 | } | |
320 | ||
321 | static int __init do_reset(void) | |
322 | { | |
323 | while (byte_count && *victim == '\0') | |
324 | eat(1); | |
325 | if (byte_count && (this_header & 3)) | |
326 | error("broken padding"); | |
327 | return 1; | |
328 | } | |
329 | ||
330 | static void __init clean_path(char *path, umode_t fmode) | |
331 | { | |
332 | struct kstat st; | |
333 | ||
334 | if (!init_stat(path, &st, AT_SYMLINK_NOFOLLOW) && | |
335 | (st.mode ^ fmode) & S_IFMT) { | |
336 | if (S_ISDIR(st.mode)) | |
337 | init_rmdir(path); | |
338 | else | |
339 | init_unlink(path); | |
340 | } | |
341 | } | |
342 | ||
343 | static int __init maybe_link(void) | |
344 | { | |
345 | if (nlink >= 2) { | |
346 | char *old = find_link(major, minor, ino, mode, collected); | |
347 | if (old) { | |
348 | clean_path(collected, 0); | |
349 | return (init_link(old, collected) < 0) ? -1 : 1; | |
350 | } | |
351 | } | |
352 | return 0; | |
353 | } | |
354 | ||
355 | static __initdata struct file *wfile; | |
356 | static __initdata loff_t wfile_pos; | |
357 | ||
358 | static int __init do_name(void) | |
359 | { | |
360 | state = SkipIt; | |
361 | next_state = Reset; | |
362 | if (strcmp(collected, "TRAILER!!!") == 0) { | |
363 | free_hash(); | |
364 | return 0; | |
365 | } | |
366 | clean_path(collected, mode); | |
367 | if (S_ISREG(mode)) { | |
368 | int ml = maybe_link(); | |
369 | if (ml >= 0) { | |
370 | int openflags = O_WRONLY|O_CREAT; | |
371 | if (ml != 1) | |
372 | openflags |= O_TRUNC; | |
373 | wfile = filp_open(collected, openflags, mode); | |
374 | if (IS_ERR(wfile)) | |
375 | return 0; | |
376 | wfile_pos = 0; | |
377 | io_csum = 0; | |
378 | ||
379 | vfs_fchown(wfile, uid, gid); | |
380 | vfs_fchmod(wfile, mode); | |
381 | if (body_len) | |
382 | vfs_truncate(&wfile->f_path, body_len); | |
383 | state = CopyFile; | |
384 | } | |
385 | } else if (S_ISDIR(mode)) { | |
386 | init_mkdir(collected, mode); | |
387 | init_chown(collected, uid, gid, 0); | |
388 | init_chmod(collected, mode); | |
389 | dir_add(collected, mtime); | |
390 | } else if (S_ISBLK(mode) || S_ISCHR(mode) || | |
391 | S_ISFIFO(mode) || S_ISSOCK(mode)) { | |
392 | if (maybe_link() == 0) { | |
393 | init_mknod(collected, mode, rdev); | |
394 | init_chown(collected, uid, gid, 0); | |
395 | init_chmod(collected, mode); | |
396 | do_utime(collected, mtime); | |
397 | } | |
398 | } | |
399 | return 0; | |
400 | } | |
401 | ||
402 | static int __init do_copy(void) | |
403 | { | |
404 | if (byte_count >= body_len) { | |
405 | if (xwrite(wfile, victim, body_len, &wfile_pos) != body_len) | |
406 | error("write error"); | |
407 | ||
408 | do_utime_path(&wfile->f_path, mtime); | |
409 | fput(wfile); | |
410 | if (csum_present && io_csum != hdr_csum) | |
411 | error("bad data checksum"); | |
412 | eat(body_len); | |
413 | state = SkipIt; | |
414 | return 0; | |
415 | } else { | |
416 | if (xwrite(wfile, victim, byte_count, &wfile_pos) != byte_count) | |
417 | error("write error"); | |
418 | body_len -= byte_count; | |
419 | eat(byte_count); | |
420 | return 1; | |
421 | } | |
422 | } | |
423 | ||
424 | static int __init do_symlink(void) | |
425 | { | |
426 | collected[N_ALIGN(name_len) + body_len] = '\0'; | |
427 | clean_path(collected, 0); | |
428 | init_symlink(collected + N_ALIGN(name_len), collected); | |
429 | init_chown(collected, uid, gid, AT_SYMLINK_NOFOLLOW); | |
430 | do_utime(collected, mtime); | |
431 | state = SkipIt; | |
432 | next_state = Reset; | |
433 | return 0; | |
434 | } | |
435 | ||
436 | static __initdata int (*actions[])(void) = { | |
437 | [Start] = do_start, | |
438 | [Collect] = do_collect, | |
439 | [GotHeader] = do_header, | |
440 | [SkipIt] = do_skip, | |
441 | [GotName] = do_name, | |
442 | [CopyFile] = do_copy, | |
443 | [GotSymlink] = do_symlink, | |
444 | [Reset] = do_reset, | |
445 | }; | |
446 | ||
447 | static long __init write_buffer(char *buf, unsigned long len) | |
448 | { | |
449 | byte_count = len; | |
450 | victim = buf; | |
451 | ||
452 | while (!actions[state]()) | |
453 | ; | |
454 | return len - byte_count; | |
455 | } | |
456 | ||
457 | static long __init flush_buffer(void *bufv, unsigned long len) | |
458 | { | |
459 | char *buf = bufv; | |
460 | long written; | |
461 | long origLen = len; | |
462 | if (message) | |
463 | return -1; | |
464 | while ((written = write_buffer(buf, len)) < len && !message) { | |
465 | char c = buf[written]; | |
466 | if (c == '0') { | |
467 | buf += written; | |
468 | len -= written; | |
469 | state = Start; | |
470 | } else if (c == 0) { | |
471 | buf += written; | |
472 | len -= written; | |
473 | state = Reset; | |
474 | } else | |
475 | error("junk within compressed archive"); | |
476 | } | |
477 | return origLen; | |
478 | } | |
479 | ||
480 | static unsigned long my_inptr __initdata; /* index of next byte to be processed in inbuf */ | |
481 | ||
482 | #include <linux/decompress/generic.h> | |
483 | ||
484 | static char * __init unpack_to_rootfs(char *buf, unsigned long len) | |
485 | { | |
486 | long written; | |
487 | decompress_fn decompress; | |
488 | const char *compress_name; | |
489 | static __initdata char msg_buf[64]; | |
490 | ||
491 | header_buf = kmalloc(110, GFP_KERNEL); | |
492 | symlink_buf = kmalloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1, GFP_KERNEL); | |
493 | name_buf = kmalloc(N_ALIGN(PATH_MAX), GFP_KERNEL); | |
494 | ||
495 | if (!header_buf || !symlink_buf || !name_buf) | |
496 | panic_show_mem("can't allocate buffers"); | |
497 | ||
498 | state = Start; | |
499 | this_header = 0; | |
500 | message = NULL; | |
501 | while (!message && len) { | |
502 | loff_t saved_offset = this_header; | |
503 | if (*buf == '0' && !(this_header & 3)) { | |
504 | state = Start; | |
505 | written = write_buffer(buf, len); | |
506 | buf += written; | |
507 | len -= written; | |
508 | continue; | |
509 | } | |
510 | if (!*buf) { | |
511 | buf++; | |
512 | len--; | |
513 | this_header++; | |
514 | continue; | |
515 | } | |
516 | this_header = 0; | |
517 | decompress = decompress_method(buf, len, &compress_name); | |
518 | pr_debug("Detected %s compressed data\n", compress_name); | |
519 | if (decompress) { | |
520 | int res = decompress(buf, len, NULL, flush_buffer, NULL, | |
521 | &my_inptr, error); | |
522 | if (res) | |
523 | error("decompressor failed"); | |
524 | } else if (compress_name) { | |
525 | if (!message) { | |
526 | snprintf(msg_buf, sizeof msg_buf, | |
527 | "compression method %s not configured", | |
528 | compress_name); | |
529 | message = msg_buf; | |
530 | } | |
531 | } else | |
532 | error("invalid magic at start of compressed archive"); | |
533 | if (state != Reset) | |
534 | error("junk at the end of compressed archive"); | |
535 | this_header = saved_offset + my_inptr; | |
536 | buf += my_inptr; | |
537 | len -= my_inptr; | |
538 | } | |
539 | dir_utime(); | |
540 | kfree(name_buf); | |
541 | kfree(symlink_buf); | |
542 | kfree(header_buf); | |
543 | return message; | |
544 | } | |
545 | ||
546 | static int __initdata do_retain_initrd; | |
547 | ||
548 | static int __init retain_initrd_param(char *str) | |
549 | { | |
550 | if (*str) | |
551 | return 0; | |
552 | do_retain_initrd = 1; | |
553 | return 1; | |
554 | } | |
555 | __setup("retain_initrd", retain_initrd_param); | |
556 | ||
557 | #ifdef CONFIG_ARCH_HAS_KEEPINITRD | |
558 | static int __init keepinitrd_setup(char *__unused) | |
559 | { | |
560 | do_retain_initrd = 1; | |
561 | return 1; | |
562 | } | |
563 | __setup("keepinitrd", keepinitrd_setup); | |
564 | #endif | |
565 | ||
566 | static bool __initdata initramfs_async = true; | |
567 | static int __init initramfs_async_setup(char *str) | |
568 | { | |
569 | return kstrtobool(str, &initramfs_async) == 0; | |
570 | } | |
571 | __setup("initramfs_async=", initramfs_async_setup); | |
572 | ||
573 | extern char __initramfs_start[]; | |
574 | extern unsigned long __initramfs_size; | |
575 | #include <linux/initrd.h> | |
576 | #include <linux/kexec.h> | |
577 | ||
578 | static ssize_t raw_read(struct file *file, struct kobject *kobj, | |
579 | struct bin_attribute *attr, char *buf, | |
580 | loff_t pos, size_t count) | |
581 | { | |
582 | memcpy(buf, attr->private + pos, count); | |
583 | return count; | |
584 | } | |
585 | ||
586 | static BIN_ATTR(initrd, 0440, raw_read, NULL, 0); | |
587 | ||
588 | void __init reserve_initrd_mem(void) | |
589 | { | |
590 | phys_addr_t start; | |
591 | unsigned long size; | |
592 | ||
593 | /* Ignore the virtul address computed during device tree parsing */ | |
594 | initrd_start = initrd_end = 0; | |
595 | ||
596 | if (!phys_initrd_size) | |
597 | return; | |
598 | /* | |
599 | * Round the memory region to page boundaries as per free_initrd_mem() | |
600 | * This allows us to detect whether the pages overlapping the initrd | |
601 | * are in use, but more importantly, reserves the entire set of pages | |
602 | * as we don't want these pages allocated for other purposes. | |
603 | */ | |
604 | start = round_down(phys_initrd_start, PAGE_SIZE); | |
605 | size = phys_initrd_size + (phys_initrd_start - start); | |
606 | size = round_up(size, PAGE_SIZE); | |
607 | ||
608 | if (!memblock_is_region_memory(start, size)) { | |
609 | pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region", | |
610 | (u64)start, size); | |
611 | goto disable; | |
612 | } | |
613 | ||
614 | if (memblock_is_region_reserved(start, size)) { | |
615 | pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region\n", | |
616 | (u64)start, size); | |
617 | goto disable; | |
618 | } | |
619 | ||
620 | memblock_reserve(start, size); | |
621 | /* Now convert initrd to virtual addresses */ | |
622 | initrd_start = (unsigned long)__va(phys_initrd_start); | |
623 | initrd_end = initrd_start + phys_initrd_size; | |
624 | initrd_below_start_ok = 1; | |
625 | ||
626 | return; | |
627 | disable: | |
628 | pr_cont(" - disabling initrd\n"); | |
629 | initrd_start = 0; | |
630 | initrd_end = 0; | |
631 | } | |
632 | ||
633 | void __weak __init free_initrd_mem(unsigned long start, unsigned long end) | |
634 | { | |
635 | #ifdef CONFIG_ARCH_KEEP_MEMBLOCK | |
636 | unsigned long aligned_start = ALIGN_DOWN(start, PAGE_SIZE); | |
637 | unsigned long aligned_end = ALIGN(end, PAGE_SIZE); | |
638 | ||
639 | memblock_free((void *)aligned_start, aligned_end - aligned_start); | |
640 | #endif | |
641 | ||
642 | free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM, | |
643 | "initrd"); | |
644 | } | |
645 | ||
646 | #ifdef CONFIG_CRASH_RESERVE | |
647 | static bool __init kexec_free_initrd(void) | |
648 | { | |
649 | unsigned long crashk_start = (unsigned long)__va(crashk_res.start); | |
650 | unsigned long crashk_end = (unsigned long)__va(crashk_res.end); | |
651 | ||
652 | /* | |
653 | * If the initrd region is overlapped with crashkernel reserved region, | |
654 | * free only memory that is not part of crashkernel region. | |
655 | */ | |
656 | if (initrd_start >= crashk_end || initrd_end <= crashk_start) | |
657 | return false; | |
658 | ||
659 | /* | |
660 | * Initialize initrd memory region since the kexec boot does not do. | |
661 | */ | |
662 | memset((void *)initrd_start, 0, initrd_end - initrd_start); | |
663 | if (initrd_start < crashk_start) | |
664 | free_initrd_mem(initrd_start, crashk_start); | |
665 | if (initrd_end > crashk_end) | |
666 | free_initrd_mem(crashk_end, initrd_end); | |
667 | return true; | |
668 | } | |
669 | #else | |
670 | static inline bool kexec_free_initrd(void) | |
671 | { | |
672 | return false; | |
673 | } | |
674 | #endif /* CONFIG_KEXEC_CORE */ | |
675 | ||
676 | #ifdef CONFIG_BLK_DEV_RAM | |
677 | static void __init populate_initrd_image(char *err) | |
678 | { | |
679 | ssize_t written; | |
680 | struct file *file; | |
681 | loff_t pos = 0; | |
682 | ||
683 | printk(KERN_INFO "rootfs image is not initramfs (%s); looks like an initrd\n", | |
684 | err); | |
685 | file = filp_open("/initrd.image", O_WRONLY|O_CREAT|O_LARGEFILE, 0700); | |
686 | if (IS_ERR(file)) | |
687 | return; | |
688 | ||
689 | written = xwrite(file, (char *)initrd_start, initrd_end - initrd_start, | |
690 | &pos); | |
691 | if (written != initrd_end - initrd_start) | |
692 | pr_err("/initrd.image: incomplete write (%zd != %ld)\n", | |
693 | written, initrd_end - initrd_start); | |
694 | fput(file); | |
695 | } | |
696 | #endif /* CONFIG_BLK_DEV_RAM */ | |
697 | ||
698 | static void __init do_populate_rootfs(void *unused, async_cookie_t cookie) | |
699 | { | |
700 | /* Load the built in initramfs */ | |
701 | char *err = unpack_to_rootfs(__initramfs_start, __initramfs_size); | |
702 | if (err) | |
703 | panic_show_mem("%s", err); /* Failed to decompress INTERNAL initramfs */ | |
704 | ||
705 | if (!initrd_start || IS_ENABLED(CONFIG_INITRAMFS_FORCE)) | |
706 | goto done; | |
707 | ||
708 | if (IS_ENABLED(CONFIG_BLK_DEV_RAM)) | |
709 | printk(KERN_INFO "Trying to unpack rootfs image as initramfs...\n"); | |
710 | else | |
711 | printk(KERN_INFO "Unpacking initramfs...\n"); | |
712 | ||
713 | err = unpack_to_rootfs((char *)initrd_start, initrd_end - initrd_start); | |
714 | if (err) { | |
715 | #ifdef CONFIG_BLK_DEV_RAM | |
716 | populate_initrd_image(err); | |
717 | #else | |
718 | printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err); | |
719 | #endif | |
720 | } | |
721 | ||
722 | done: | |
723 | /* | |
724 | * If the initrd region is overlapped with crashkernel reserved region, | |
725 | * free only memory that is not part of crashkernel region. | |
726 | */ | |
727 | if (!do_retain_initrd && initrd_start && !kexec_free_initrd()) { | |
728 | free_initrd_mem(initrd_start, initrd_end); | |
729 | } else if (do_retain_initrd && initrd_start) { | |
730 | bin_attr_initrd.size = initrd_end - initrd_start; | |
731 | bin_attr_initrd.private = (void *)initrd_start; | |
732 | if (sysfs_create_bin_file(firmware_kobj, &bin_attr_initrd)) | |
733 | pr_err("Failed to create initrd sysfs file"); | |
734 | } | |
735 | initrd_start = 0; | |
736 | initrd_end = 0; | |
737 | ||
738 | init_flush_fput(); | |
739 | } | |
740 | ||
741 | static ASYNC_DOMAIN_EXCLUSIVE(initramfs_domain); | |
742 | static async_cookie_t initramfs_cookie; | |
743 | ||
744 | void wait_for_initramfs(void) | |
745 | { | |
746 | if (!initramfs_cookie) { | |
747 | /* | |
748 | * Something before rootfs_initcall wants to access | |
749 | * the filesystem/initramfs. Probably a bug. Make a | |
750 | * note, avoid deadlocking the machine, and let the | |
751 | * caller's access fail as it used to. | |
752 | */ | |
753 | pr_warn_once("wait_for_initramfs() called before rootfs_initcalls\n"); | |
754 | return; | |
755 | } | |
756 | async_synchronize_cookie_domain(initramfs_cookie + 1, &initramfs_domain); | |
757 | } | |
758 | EXPORT_SYMBOL_GPL(wait_for_initramfs); | |
759 | ||
760 | static int __init populate_rootfs(void) | |
761 | { | |
762 | initramfs_cookie = async_schedule_domain(do_populate_rootfs, NULL, | |
763 | &initramfs_domain); | |
764 | usermodehelper_enable(); | |
765 | if (!initramfs_async) | |
766 | wait_for_initramfs(); | |
767 | return 0; | |
768 | } | |
769 | rootfs_initcall(populate_rootfs); |