Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | #include <linux/init.h> |
e7cb072e | 3 | #include <linux/async.h> |
1da177e4 LT |
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> | |
df52092f | 10 | #include <linux/dirent.h> |
1da177e4 | 11 | #include <linux/syscalls.h> |
889d51a1 | 12 | #include <linux/utime.h> |
08865514 | 13 | #include <linux/file.h> |
f3296f80 | 14 | #include <linux/kstrtox.h> |
899ee4af | 15 | #include <linux/memblock.h> |
dd23e809 | 16 | #include <linux/mm.h> |
b2a74d5f | 17 | #include <linux/namei.h> |
8fb9f73e | 18 | #include <linux/init_syscalls.h> |
68d85f0a | 19 | #include <linux/task_work.h> |
b234ed6d | 20 | #include <linux/umh.h> |
1da177e4 | 21 | |
800c24dc DD |
22 | static __initdata bool csum_present; |
23 | static __initdata u32 io_csum; | |
24 | ||
25 | static ssize_t __init xwrite(struct file *file, const unsigned char *p, | |
26 | size_t count, loff_t *pos) | |
38747439 YL |
27 | { |
28 | ssize_t out = 0; | |
29 | ||
30 | /* sys_write only can write MAX_RW_COUNT aka 2G-4K bytes at most */ | |
31 | while (count) { | |
bf6419e4 | 32 | ssize_t rv = kernel_write(file, p, count, pos); |
38747439 YL |
33 | |
34 | if (rv < 0) { | |
35 | if (rv == -EINTR || rv == -EAGAIN) | |
36 | continue; | |
37 | return out ? out : rv; | |
38 | } else if (rv == 0) | |
39 | break; | |
40 | ||
800c24dc DD |
41 | if (csum_present) { |
42 | ssize_t i; | |
43 | ||
44 | for (i = 0; i < rv; i++) | |
45 | io_csum += p[i]; | |
46 | } | |
47 | ||
38747439 YL |
48 | p += rv; |
49 | out += rv; | |
50 | count -= rv; | |
51 | } | |
52 | ||
53 | return out; | |
54 | } | |
55 | ||
1da177e4 LT |
56 | static __initdata char *message; |
57 | static void __init error(char *x) | |
58 | { | |
59 | if (!message) | |
60 | message = x; | |
61 | } | |
62 | ||
735faf92 BG |
63 | #define panic_show_mem(fmt, ...) \ |
64 | ({ show_mem(0, NULL); panic(fmt, ##__VA_ARGS__); }) | |
dd23e809 | 65 | |
1da177e4 LT |
66 | /* link hash */ |
67 | ||
6a050da4 MH |
68 | #define N_ALIGN(len) ((((len) + 1) & ~3) + 2) |
69 | ||
1da177e4 LT |
70 | static __initdata struct hash { |
71 | int ino, minor, major; | |
685dd2d5 | 72 | umode_t mode; |
1da177e4 | 73 | struct hash *next; |
6a050da4 | 74 | char name[N_ALIGN(PATH_MAX)]; |
1da177e4 LT |
75 | } *head[32]; |
76 | ||
77 | static inline int hash(int major, int minor, int ino) | |
78 | { | |
79 | unsigned long tmp = ino + minor + (major << 3); | |
80 | tmp += tmp >> 5; | |
81 | return tmp & 31; | |
82 | } | |
83 | ||
2139a7fb | 84 | static char __init *find_link(int major, int minor, int ino, |
685dd2d5 | 85 | umode_t mode, char *name) |
1da177e4 LT |
86 | { |
87 | struct hash **p, *q; | |
88 | for (p = head + hash(major, minor, ino); *p; p = &(*p)->next) { | |
89 | if ((*p)->ino != ino) | |
90 | continue; | |
91 | if ((*p)->minor != minor) | |
92 | continue; | |
93 | if ((*p)->major != major) | |
94 | continue; | |
2139a7fb PA |
95 | if (((*p)->mode ^ mode) & S_IFMT) |
96 | continue; | |
1da177e4 LT |
97 | return (*p)->name; |
98 | } | |
3265e66b | 99 | q = kmalloc(sizeof(struct hash), GFP_KERNEL); |
1da177e4 | 100 | if (!q) |
dd23e809 | 101 | panic_show_mem("can't allocate link hash entry"); |
1da177e4 | 102 | q->major = major; |
2139a7fb PA |
103 | q->minor = minor; |
104 | q->ino = ino; | |
105 | q->mode = mode; | |
6a050da4 | 106 | strcpy(q->name, name); |
1da177e4 LT |
107 | q->next = NULL; |
108 | *p = q; | |
109 | return NULL; | |
110 | } | |
111 | ||
112 | static void __init free_hash(void) | |
113 | { | |
114 | struct hash **p, *q; | |
115 | for (p = head; p < head + 32; p++) { | |
116 | while (*p) { | |
117 | q = *p; | |
118 | *p = q->next; | |
3265e66b | 119 | kfree(q); |
1da177e4 LT |
120 | } |
121 | } | |
122 | } | |
123 | ||
1274aea1 DD |
124 | #ifdef CONFIG_INITRAMFS_PRESERVE_MTIME |
125 | static void __init do_utime(char *filename, time64_t mtime) | |
889d51a1 | 126 | { |
1274aea1 DD |
127 | struct timespec64 t[2] = { { .tv_sec = mtime }, { .tv_sec = mtime } }; |
128 | init_utimes(filename, t); | |
129 | } | |
889d51a1 | 130 | |
1274aea1 DD |
131 | static void __init do_utime_path(const struct path *path, time64_t mtime) |
132 | { | |
133 | struct timespec64 t[2] = { { .tv_sec = mtime }, { .tv_sec = mtime } }; | |
134 | vfs_utimes(path, t); | |
889d51a1 NL |
135 | } |
136 | ||
137 | static __initdata LIST_HEAD(dir_list); | |
138 | struct dir_entry { | |
139 | struct list_head list; | |
e35c4c64 | 140 | time64_t mtime; |
fcb7aedd | 141 | char name[]; |
889d51a1 NL |
142 | }; |
143 | ||
e35c4c64 | 144 | static void __init dir_add(const char *name, time64_t mtime) |
889d51a1 | 145 | { |
fcb7aedd DD |
146 | size_t nlen = strlen(name) + 1; |
147 | struct dir_entry *de; | |
148 | ||
149 | de = kmalloc(sizeof(struct dir_entry) + nlen, GFP_KERNEL); | |
889d51a1 | 150 | if (!de) |
dd23e809 | 151 | panic_show_mem("can't allocate dir_entry buffer"); |
889d51a1 | 152 | INIT_LIST_HEAD(&de->list); |
fcb7aedd | 153 | strscpy(de->name, name, nlen); |
889d51a1 NL |
154 | de->mtime = mtime; |
155 | list_add(&de->list, &dir_list); | |
156 | } | |
157 | ||
158 | static void __init dir_utime(void) | |
159 | { | |
160 | struct dir_entry *de, *tmp; | |
161 | list_for_each_entry_safe(de, tmp, &dir_list, list) { | |
162 | list_del(&de->list); | |
163 | do_utime(de->name, de->mtime); | |
889d51a1 NL |
164 | kfree(de); |
165 | } | |
166 | } | |
1274aea1 DD |
167 | #else |
168 | static void __init do_utime(char *filename, time64_t mtime) {} | |
169 | static void __init do_utime_path(const struct path *path, time64_t mtime) {} | |
170 | static void __init dir_add(const char *name, time64_t mtime) {} | |
171 | static void __init dir_utime(void) {} | |
172 | #endif | |
889d51a1 | 173 | |
e35c4c64 | 174 | static __initdata time64_t mtime; |
889d51a1 | 175 | |
1da177e4 LT |
176 | /* cpio header parsing */ |
177 | ||
178 | static __initdata unsigned long ino, major, minor, nlink; | |
685dd2d5 | 179 | static __initdata umode_t mode; |
1da177e4 LT |
180 | static __initdata unsigned long body_len, name_len; |
181 | static __initdata uid_t uid; | |
182 | static __initdata gid_t gid; | |
183 | static __initdata unsigned rdev; | |
800c24dc | 184 | static __initdata u32 hdr_csum; |
1da177e4 LT |
185 | |
186 | static void __init parse_header(char *s) | |
187 | { | |
800c24dc | 188 | unsigned long parsed[13]; |
1da177e4 LT |
189 | char buf[9]; |
190 | int i; | |
191 | ||
192 | buf[8] = '\0'; | |
800c24dc | 193 | for (i = 0, s += 6; i < 13; i++, s += 8) { |
1da177e4 LT |
194 | memcpy(buf, s, 8); |
195 | parsed[i] = simple_strtoul(buf, NULL, 16); | |
196 | } | |
197 | ino = parsed[0]; | |
198 | mode = parsed[1]; | |
199 | uid = parsed[2]; | |
200 | gid = parsed[3]; | |
201 | nlink = parsed[4]; | |
e35c4c64 | 202 | mtime = parsed[5]; /* breaks in y2106 */ |
1da177e4 LT |
203 | body_len = parsed[6]; |
204 | major = parsed[7]; | |
205 | minor = parsed[8]; | |
206 | rdev = new_encode_dev(MKDEV(parsed[9], parsed[10])); | |
207 | name_len = parsed[11]; | |
800c24dc | 208 | hdr_csum = parsed[12]; |
1da177e4 LT |
209 | } |
210 | ||
211 | /* FSM */ | |
212 | ||
213 | static __initdata enum state { | |
214 | Start, | |
215 | Collect, | |
216 | GotHeader, | |
217 | SkipIt, | |
218 | GotName, | |
219 | CopyFile, | |
220 | GotSymlink, | |
221 | Reset | |
222 | } state, next_state; | |
223 | ||
224 | static __initdata char *victim; | |
c34d85ac | 225 | static unsigned long byte_count __initdata; |
1da177e4 LT |
226 | static __initdata loff_t this_header, next_header; |
227 | ||
b0a5ab93 | 228 | static inline void __init eat(unsigned n) |
1da177e4 LT |
229 | { |
230 | victim += n; | |
231 | this_header += n; | |
c34d85ac | 232 | byte_count -= n; |
1da177e4 LT |
233 | } |
234 | ||
1da177e4 | 235 | static __initdata char *collected; |
d97b07c5 | 236 | static long remains __initdata; |
1da177e4 LT |
237 | static __initdata char *collect; |
238 | ||
239 | static void __init read_into(char *buf, unsigned size, enum state next) | |
240 | { | |
c34d85ac | 241 | if (byte_count >= size) { |
1da177e4 LT |
242 | collected = victim; |
243 | eat(size); | |
244 | state = next; | |
245 | } else { | |
246 | collect = collected = buf; | |
247 | remains = size; | |
248 | next_state = next; | |
249 | state = Collect; | |
250 | } | |
251 | } | |
252 | ||
253 | static __initdata char *header_buf, *symlink_buf, *name_buf; | |
254 | ||
255 | static int __init do_start(void) | |
256 | { | |
257 | read_into(header_buf, 110, GotHeader); | |
258 | return 0; | |
259 | } | |
260 | ||
261 | static int __init do_collect(void) | |
262 | { | |
d97b07c5 | 263 | unsigned long n = remains; |
c34d85ac MR |
264 | if (byte_count < n) |
265 | n = byte_count; | |
1da177e4 LT |
266 | memcpy(collect, victim, n); |
267 | eat(n); | |
268 | collect += n; | |
269 | if ((remains -= n) != 0) | |
270 | return 1; | |
271 | state = next_state; | |
272 | return 0; | |
273 | } | |
274 | ||
275 | static int __init do_header(void) | |
276 | { | |
800c24dc DD |
277 | if (!memcmp(collected, "070701", 6)) { |
278 | csum_present = false; | |
279 | } else if (!memcmp(collected, "070702", 6)) { | |
280 | csum_present = true; | |
281 | } else { | |
da028e4c DD |
282 | if (memcmp(collected, "070707", 6) == 0) |
283 | error("incorrect cpio method used: use -H newc option"); | |
284 | else | |
285 | error("no cpio magic"); | |
1da177e4 LT |
286 | return 1; |
287 | } | |
288 | parse_header(collected); | |
289 | next_header = this_header + N_ALIGN(name_len) + body_len; | |
290 | next_header = (next_header + 3) & ~3; | |
1da177e4 LT |
291 | state = SkipIt; |
292 | if (name_len <= 0 || name_len > PATH_MAX) | |
293 | return 0; | |
294 | if (S_ISLNK(mode)) { | |
295 | if (body_len > PATH_MAX) | |
296 | return 0; | |
297 | collect = collected = symlink_buf; | |
298 | remains = N_ALIGN(name_len) + body_len; | |
299 | next_state = GotSymlink; | |
300 | state = Collect; | |
301 | return 0; | |
302 | } | |
303 | if (S_ISREG(mode) || !body_len) | |
304 | read_into(name_buf, N_ALIGN(name_len), GotName); | |
305 | return 0; | |
306 | } | |
307 | ||
308 | static int __init do_skip(void) | |
309 | { | |
c34d85ac MR |
310 | if (this_header + byte_count < next_header) { |
311 | eat(byte_count); | |
1da177e4 LT |
312 | return 1; |
313 | } else { | |
314 | eat(next_header - this_header); | |
315 | state = next_state; | |
316 | return 0; | |
317 | } | |
318 | } | |
319 | ||
320 | static int __init do_reset(void) | |
321 | { | |
c34d85ac | 322 | while (byte_count && *victim == '\0') |
1da177e4 | 323 | eat(1); |
c34d85ac | 324 | if (byte_count && (this_header & 3)) |
1da177e4 LT |
325 | error("broken padding"); |
326 | return 1; | |
327 | } | |
328 | ||
c34d85ac | 329 | static void __init clean_path(char *path, umode_t fmode) |
2139a7fb | 330 | { |
046aa126 | 331 | struct kstat st; |
2139a7fb | 332 | |
7b81ce7c | 333 | if (!init_stat(path, &st, AT_SYMLINK_NOFOLLOW) && |
716308a5 | 334 | (st.mode ^ fmode) & S_IFMT) { |
046aa126 | 335 | if (S_ISDIR(st.mode)) |
20cce026 | 336 | init_rmdir(path); |
2139a7fb | 337 | else |
8fb9f73e | 338 | init_unlink(path); |
2139a7fb PA |
339 | } |
340 | } | |
341 | ||
7c0950d4 LZ |
342 | static int __init maybe_link(void) |
343 | { | |
344 | if (nlink >= 2) { | |
345 | char *old = find_link(major, minor, ino, mode, collected); | |
346 | if (old) { | |
347 | clean_path(collected, 0); | |
812931d6 | 348 | return (init_link(old, collected) < 0) ? -1 : 1; |
7c0950d4 LZ |
349 | } |
350 | } | |
351 | return 0; | |
352 | } | |
353 | ||
bf6419e4 CH |
354 | static __initdata struct file *wfile; |
355 | static __initdata loff_t wfile_pos; | |
1da177e4 LT |
356 | |
357 | static int __init do_name(void) | |
358 | { | |
359 | state = SkipIt; | |
360 | next_state = Reset; | |
361 | if (strcmp(collected, "TRAILER!!!") == 0) { | |
362 | free_hash(); | |
363 | return 0; | |
364 | } | |
2139a7fb | 365 | clean_path(collected, mode); |
1da177e4 | 366 | if (S_ISREG(mode)) { |
2139a7fb PA |
367 | int ml = maybe_link(); |
368 | if (ml >= 0) { | |
369 | int openflags = O_WRONLY|O_CREAT; | |
370 | if (ml != 1) | |
371 | openflags |= O_TRUNC; | |
bf6419e4 CH |
372 | wfile = filp_open(collected, openflags, mode); |
373 | if (IS_ERR(wfile)) | |
374 | return 0; | |
375 | wfile_pos = 0; | |
800c24dc | 376 | io_csum = 0; |
bf6419e4 CH |
377 | |
378 | vfs_fchown(wfile, uid, gid); | |
379 | vfs_fchmod(wfile, mode); | |
380 | if (body_len) | |
381 | vfs_truncate(&wfile->f_path, body_len); | |
bf6419e4 | 382 | state = CopyFile; |
1da177e4 LT |
383 | } |
384 | } else if (S_ISDIR(mode)) { | |
83ff98c3 | 385 | init_mkdir(collected, mode); |
b873498f | 386 | init_chown(collected, uid, gid, 0); |
1097742e | 387 | init_chmod(collected, mode); |
889d51a1 | 388 | dir_add(collected, mtime); |
1da177e4 LT |
389 | } else if (S_ISBLK(mode) || S_ISCHR(mode) || |
390 | S_ISFIFO(mode) || S_ISSOCK(mode)) { | |
391 | if (maybe_link() == 0) { | |
5fee64fc | 392 | init_mknod(collected, mode, rdev); |
b873498f | 393 | init_chown(collected, uid, gid, 0); |
1097742e | 394 | init_chmod(collected, mode); |
889d51a1 | 395 | do_utime(collected, mtime); |
1da177e4 LT |
396 | } |
397 | } | |
398 | return 0; | |
399 | } | |
400 | ||
401 | static int __init do_copy(void) | |
402 | { | |
c34d85ac | 403 | if (byte_count >= body_len) { |
bf6419e4 | 404 | if (xwrite(wfile, victim, body_len, &wfile_pos) != body_len) |
9687fd91 | 405 | error("write error"); |
38b08223 | 406 | |
1274aea1 | 407 | do_utime_path(&wfile->f_path, mtime); |
bf6419e4 | 408 | fput(wfile); |
800c24dc DD |
409 | if (csum_present && io_csum != hdr_csum) |
410 | error("bad data checksum"); | |
1da177e4 LT |
411 | eat(body_len); |
412 | state = SkipIt; | |
413 | return 0; | |
414 | } else { | |
bf6419e4 | 415 | if (xwrite(wfile, victim, byte_count, &wfile_pos) != byte_count) |
9687fd91 | 416 | error("write error"); |
c34d85ac MR |
417 | body_len -= byte_count; |
418 | eat(byte_count); | |
1da177e4 LT |
419 | return 1; |
420 | } | |
421 | } | |
422 | ||
423 | static int __init do_symlink(void) | |
424 | { | |
425 | collected[N_ALIGN(name_len) + body_len] = '\0'; | |
2139a7fb | 426 | clean_path(collected, 0); |
cd3acb6a | 427 | init_symlink(collected + N_ALIGN(name_len), collected); |
b873498f | 428 | init_chown(collected, uid, gid, AT_SYMLINK_NOFOLLOW); |
889d51a1 | 429 | do_utime(collected, mtime); |
1da177e4 LT |
430 | state = SkipIt; |
431 | next_state = Reset; | |
432 | return 0; | |
433 | } | |
434 | ||
435 | static __initdata int (*actions[])(void) = { | |
436 | [Start] = do_start, | |
437 | [Collect] = do_collect, | |
438 | [GotHeader] = do_header, | |
439 | [SkipIt] = do_skip, | |
440 | [GotName] = do_name, | |
441 | [CopyFile] = do_copy, | |
442 | [GotSymlink] = do_symlink, | |
443 | [Reset] = do_reset, | |
444 | }; | |
445 | ||
d97b07c5 | 446 | static long __init write_buffer(char *buf, unsigned long len) |
1da177e4 | 447 | { |
c34d85ac | 448 | byte_count = len; |
1da177e4 LT |
449 | victim = buf; |
450 | ||
451 | while (!actions[state]()) | |
452 | ; | |
c34d85ac | 453 | return len - byte_count; |
1da177e4 LT |
454 | } |
455 | ||
d97b07c5 | 456 | static long __init flush_buffer(void *bufv, unsigned long len) |
1da177e4 | 457 | { |
4197530b | 458 | char *buf = bufv; |
d97b07c5 YL |
459 | long written; |
460 | long origLen = len; | |
1da177e4 | 461 | if (message) |
30d65dbf | 462 | return -1; |
1da177e4 LT |
463 | while ((written = write_buffer(buf, len)) < len && !message) { |
464 | char c = buf[written]; | |
465 | if (c == '0') { | |
466 | buf += written; | |
467 | len -= written; | |
468 | state = Start; | |
469 | } else if (c == 0) { | |
470 | buf += written; | |
471 | len -= written; | |
472 | state = Reset; | |
473 | } else | |
e5eed351 | 474 | error("junk within compressed archive"); |
1da177e4 | 475 | } |
30d65dbf | 476 | return origLen; |
1da177e4 LT |
477 | } |
478 | ||
199cda13 | 479 | static unsigned long my_inptr __initdata; /* index of next byte to be processed in inbuf */ |
1da177e4 | 480 | |
889c92d2 | 481 | #include <linux/decompress/generic.h> |
1da177e4 | 482 | |
d97b07c5 | 483 | static char * __init unpack_to_rootfs(char *buf, unsigned long len) |
1da177e4 | 484 | { |
d97b07c5 | 485 | long written; |
889c92d2 | 486 | decompress_fn decompress; |
23a22d57 PA |
487 | const char *compress_name; |
488 | static __initdata char msg_buf[64]; | |
889c92d2 | 489 | |
3265e66b TP |
490 | header_buf = kmalloc(110, GFP_KERNEL); |
491 | symlink_buf = kmalloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1, GFP_KERNEL); | |
492 | name_buf = kmalloc(N_ALIGN(PATH_MAX), GFP_KERNEL); | |
30d65dbf AK |
493 | |
494 | if (!header_buf || !symlink_buf || !name_buf) | |
dd23e809 | 495 | panic_show_mem("can't allocate buffers"); |
30d65dbf | 496 | |
1da177e4 LT |
497 | state = Start; |
498 | this_header = 0; | |
499 | message = NULL; | |
500 | while (!message && len) { | |
501 | loff_t saved_offset = this_header; | |
502 | if (*buf == '0' && !(this_header & 3)) { | |
503 | state = Start; | |
504 | written = write_buffer(buf, len); | |
505 | buf += written; | |
506 | len -= written; | |
507 | continue; | |
508 | } | |
509 | if (!*buf) { | |
510 | buf++; | |
511 | len--; | |
512 | this_header++; | |
513 | continue; | |
514 | } | |
515 | this_header = 0; | |
23a22d57 | 516 | decompress = decompress_method(buf, len, &compress_name); |
6aa7a29a | 517 | pr_debug("Detected %s compressed data\n", compress_name); |
54291362 | 518 | if (decompress) { |
d97b07c5 | 519 | int res = decompress(buf, len, NULL, flush_buffer, NULL, |
889c92d2 | 520 | &my_inptr, error); |
54291362 PL |
521 | if (res) |
522 | error("decompressor failed"); | |
523 | } else if (compress_name) { | |
23a22d57 PA |
524 | if (!message) { |
525 | snprintf(msg_buf, sizeof msg_buf, | |
526 | "compression method %s not configured", | |
527 | compress_name); | |
528 | message = msg_buf; | |
529 | } | |
df37bd15 | 530 | } else |
e5eed351 | 531 | error("invalid magic at start of compressed archive"); |
1da177e4 | 532 | if (state != Reset) |
e5eed351 | 533 | error("junk at the end of compressed archive"); |
30d65dbf AK |
534 | this_header = saved_offset + my_inptr; |
535 | buf += my_inptr; | |
536 | len -= my_inptr; | |
1da177e4 | 537 | } |
889d51a1 | 538 | dir_utime(); |
3265e66b TP |
539 | kfree(name_buf); |
540 | kfree(symlink_buf); | |
541 | kfree(header_buf); | |
1da177e4 LT |
542 | return message; |
543 | } | |
544 | ||
0a7b35cb MN |
545 | static int __initdata do_retain_initrd; |
546 | ||
547 | static int __init retain_initrd_param(char *str) | |
548 | { | |
549 | if (*str) | |
550 | return 0; | |
551 | do_retain_initrd = 1; | |
552 | return 1; | |
553 | } | |
554 | __setup("retain_initrd", retain_initrd_param); | |
555 | ||
d8ae8a37 CH |
556 | #ifdef CONFIG_ARCH_HAS_KEEPINITRD |
557 | static int __init keepinitrd_setup(char *__unused) | |
558 | { | |
559 | do_retain_initrd = 1; | |
560 | return 1; | |
561 | } | |
562 | __setup("keepinitrd", keepinitrd_setup); | |
563 | #endif | |
564 | ||
e7cb072e RV |
565 | static bool __initdata initramfs_async = true; |
566 | static int __init initramfs_async_setup(char *str) | |
567 | { | |
f3296f80 | 568 | return kstrtobool(str, &initramfs_async) == 0; |
e7cb072e RV |
569 | } |
570 | __setup("initramfs_async=", initramfs_async_setup); | |
571 | ||
ffe8018c HB |
572 | extern char __initramfs_start[]; |
573 | extern unsigned long __initramfs_size; | |
1da177e4 | 574 | #include <linux/initrd.h> |
9c15e852 | 575 | #include <linux/kexec.h> |
0f3d2bd5 | 576 | |
c72160fe KW |
577 | void __init reserve_initrd_mem(void) |
578 | { | |
579 | phys_addr_t start; | |
580 | unsigned long size; | |
581 | ||
582 | /* Ignore the virtul address computed during device tree parsing */ | |
583 | initrd_start = initrd_end = 0; | |
584 | ||
585 | if (!phys_initrd_size) | |
586 | return; | |
587 | /* | |
588 | * Round the memory region to page boundaries as per free_initrd_mem() | |
589 | * This allows us to detect whether the pages overlapping the initrd | |
590 | * are in use, but more importantly, reserves the entire set of pages | |
591 | * as we don't want these pages allocated for other purposes. | |
592 | */ | |
593 | start = round_down(phys_initrd_start, PAGE_SIZE); | |
594 | size = phys_initrd_size + (phys_initrd_start - start); | |
595 | size = round_up(size, PAGE_SIZE); | |
596 | ||
597 | if (!memblock_is_region_memory(start, size)) { | |
598 | pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region", | |
599 | (u64)start, size); | |
600 | goto disable; | |
601 | } | |
602 | ||
603 | if (memblock_is_region_reserved(start, size)) { | |
604 | pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region\n", | |
605 | (u64)start, size); | |
606 | goto disable; | |
607 | } | |
608 | ||
609 | memblock_reserve(start, size); | |
610 | /* Now convert initrd to virtual addresses */ | |
611 | initrd_start = (unsigned long)__va(phys_initrd_start); | |
612 | initrd_end = initrd_start + phys_initrd_size; | |
613 | initrd_below_start_ok = 1; | |
614 | ||
615 | return; | |
616 | disable: | |
617 | pr_cont(" - disabling initrd\n"); | |
618 | initrd_start = 0; | |
619 | initrd_end = 0; | |
620 | } | |
621 | ||
55d5b7dd | 622 | void __weak __init free_initrd_mem(unsigned long start, unsigned long end) |
4afd58e1 | 623 | { |
899ee4af MR |
624 | #ifdef CONFIG_ARCH_KEEP_MEMBLOCK |
625 | unsigned long aligned_start = ALIGN_DOWN(start, PAGE_SIZE); | |
626 | unsigned long aligned_end = ALIGN(end, PAGE_SIZE); | |
627 | ||
4421cca0 | 628 | memblock_free((void *)aligned_start, aligned_end - aligned_start); |
899ee4af MR |
629 | #endif |
630 | ||
f94f7434 CH |
631 | free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM, |
632 | "initrd"); | |
4afd58e1 CH |
633 | } |
634 | ||
2965faa5 | 635 | #ifdef CONFIG_KEXEC_CORE |
e99332e7 | 636 | static bool __init kexec_free_initrd(void) |
23091e28 | 637 | { |
9c15e852 HM |
638 | unsigned long crashk_start = (unsigned long)__va(crashk_res.start); |
639 | unsigned long crashk_end = (unsigned long)__va(crashk_res.end); | |
640 | ||
641 | /* | |
642 | * If the initrd region is overlapped with crashkernel reserved region, | |
643 | * free only memory that is not part of crashkernel region. | |
644 | */ | |
23091e28 CH |
645 | if (initrd_start >= crashk_end || initrd_end <= crashk_start) |
646 | return false; | |
647 | ||
648 | /* | |
649 | * Initialize initrd memory region since the kexec boot does not do. | |
650 | */ | |
651 | memset((void *)initrd_start, 0, initrd_end - initrd_start); | |
652 | if (initrd_start < crashk_start) | |
653 | free_initrd_mem(initrd_start, crashk_start); | |
654 | if (initrd_end > crashk_end) | |
655 | free_initrd_mem(crashk_end, initrd_end); | |
656 | return true; | |
0f3d2bd5 | 657 | } |
23091e28 CH |
658 | #else |
659 | static inline bool kexec_free_initrd(void) | |
660 | { | |
661 | return false; | |
662 | } | |
663 | #endif /* CONFIG_KEXEC_CORE */ | |
0f3d2bd5 | 664 | |
a841c673 | 665 | #ifdef CONFIG_BLK_DEV_RAM |
4ada1e81 | 666 | static void __init populate_initrd_image(char *err) |
7c184ecd CH |
667 | { |
668 | ssize_t written; | |
bf6419e4 CH |
669 | struct file *file; |
670 | loff_t pos = 0; | |
7c184ecd CH |
671 | |
672 | unpack_to_rootfs(__initramfs_start, __initramfs_size); | |
673 | ||
674 | printk(KERN_INFO "rootfs image is not initramfs (%s); looks like an initrd\n", | |
675 | err); | |
bf6419e4 CH |
676 | file = filp_open("/initrd.image", O_WRONLY | O_CREAT, 0700); |
677 | if (IS_ERR(file)) | |
7c184ecd CH |
678 | return; |
679 | ||
bf6419e4 CH |
680 | written = xwrite(file, (char *)initrd_start, initrd_end - initrd_start, |
681 | &pos); | |
7c184ecd CH |
682 | if (written != initrd_end - initrd_start) |
683 | pr_err("/initrd.image: incomplete write (%zd != %ld)\n", | |
684 | written, initrd_end - initrd_start); | |
bf6419e4 | 685 | fput(file); |
7c184ecd CH |
686 | } |
687 | #endif /* CONFIG_BLK_DEV_RAM */ | |
688 | ||
e7cb072e | 689 | static void __init do_populate_rootfs(void *unused, async_cookie_t cookie) |
1da177e4 | 690 | { |
17a9be31 | 691 | /* Load the built in initramfs */ |
ffe8018c | 692 | char *err = unpack_to_rootfs(__initramfs_start, __initramfs_size); |
1da177e4 | 693 | if (err) |
dd23e809 | 694 | panic_show_mem("%s", err); /* Failed to decompress INTERNAL initramfs */ |
afef7889 CH |
695 | |
696 | if (!initrd_start || IS_ENABLED(CONFIG_INITRAMFS_FORCE)) | |
697 | goto done; | |
698 | ||
699 | if (IS_ENABLED(CONFIG_BLK_DEV_RAM)) | |
a1e6b6c1 | 700 | printk(KERN_INFO "Trying to unpack rootfs image as initramfs...\n"); |
afef7889 CH |
701 | else |
702 | printk(KERN_INFO "Unpacking initramfs...\n"); | |
54c7a891 | 703 | |
afef7889 CH |
704 | err = unpack_to_rootfs((char *)initrd_start, initrd_end - initrd_start); |
705 | if (err) { | |
9ab6b718 | 706 | #ifdef CONFIG_BLK_DEV_RAM |
7c184ecd | 707 | populate_initrd_image(err); |
9ab6b718 CH |
708 | #else |
709 | printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err); | |
710 | #endif | |
1da177e4 | 711 | } |
23091e28 | 712 | |
afef7889 | 713 | done: |
23091e28 CH |
714 | /* |
715 | * If the initrd region is overlapped with crashkernel reserved region, | |
716 | * free only memory that is not part of crashkernel region. | |
717 | */ | |
5d59aa8f | 718 | if (!do_retain_initrd && initrd_start && !kexec_free_initrd()) |
23091e28 CH |
719 | free_initrd_mem(initrd_start, initrd_end); |
720 | initrd_start = 0; | |
721 | initrd_end = 0; | |
722 | ||
17a9be31 | 723 | flush_delayed_fput(); |
68d85f0a | 724 | task_work_run(); |
e7cb072e RV |
725 | } |
726 | ||
727 | static ASYNC_DOMAIN_EXCLUSIVE(initramfs_domain); | |
728 | static async_cookie_t initramfs_cookie; | |
729 | ||
730 | void wait_for_initramfs(void) | |
731 | { | |
732 | if (!initramfs_cookie) { | |
733 | /* | |
734 | * Something before rootfs_initcall wants to access | |
735 | * the filesystem/initramfs. Probably a bug. Make a | |
736 | * note, avoid deadlocking the machine, and let the | |
737 | * caller's access fail as it used to. | |
738 | */ | |
739 | pr_warn_once("wait_for_initramfs() called before rootfs_initcalls\n"); | |
740 | return; | |
741 | } | |
742 | async_synchronize_cookie_domain(initramfs_cookie + 1, &initramfs_domain); | |
743 | } | |
744 | EXPORT_SYMBOL_GPL(wait_for_initramfs); | |
745 | ||
746 | static int __init populate_rootfs(void) | |
747 | { | |
748 | initramfs_cookie = async_schedule_domain(do_populate_rootfs, NULL, | |
749 | &initramfs_domain); | |
b234ed6d | 750 | usermodehelper_enable(); |
e7cb072e RV |
751 | if (!initramfs_async) |
752 | wait_for_initramfs(); | |
8d610dd5 | 753 | return 0; |
1da177e4 | 754 | } |
8d610dd5 | 755 | rootfs_initcall(populate_rootfs); |