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> |
899ee4af | 14 | #include <linux/memblock.h> |
dd23e809 | 15 | #include <linux/mm.h> |
b2a74d5f | 16 | #include <linux/namei.h> |
8fb9f73e | 17 | #include <linux/init_syscalls.h> |
b234ed6d | 18 | #include <linux/umh.h> |
1da177e4 | 19 | |
bf6419e4 CH |
20 | static ssize_t __init xwrite(struct file *file, const char *p, size_t count, |
21 | loff_t *pos) | |
38747439 YL |
22 | { |
23 | ssize_t out = 0; | |
24 | ||
25 | /* sys_write only can write MAX_RW_COUNT aka 2G-4K bytes at most */ | |
26 | while (count) { | |
bf6419e4 | 27 | ssize_t rv = kernel_write(file, p, count, pos); |
38747439 YL |
28 | |
29 | if (rv < 0) { | |
30 | if (rv == -EINTR || rv == -EAGAIN) | |
31 | continue; | |
32 | return out ? out : rv; | |
33 | } else if (rv == 0) | |
34 | break; | |
35 | ||
36 | p += rv; | |
37 | out += rv; | |
38 | count -= rv; | |
39 | } | |
40 | ||
41 | return out; | |
42 | } | |
43 | ||
1da177e4 LT |
44 | static __initdata char *message; |
45 | static void __init error(char *x) | |
46 | { | |
47 | if (!message) | |
48 | message = x; | |
49 | } | |
50 | ||
dd23e809 FF |
51 | static void panic_show_mem(const char *fmt, ...) |
52 | { | |
53 | va_list args; | |
54 | ||
55 | show_mem(0, NULL); | |
56 | va_start(args, fmt); | |
57 | panic(fmt, args); | |
58 | va_end(args); | |
59 | } | |
60 | ||
1da177e4 LT |
61 | /* link hash */ |
62 | ||
6a050da4 MH |
63 | #define N_ALIGN(len) ((((len) + 1) & ~3) + 2) |
64 | ||
1da177e4 LT |
65 | static __initdata struct hash { |
66 | int ino, minor, major; | |
685dd2d5 | 67 | umode_t mode; |
1da177e4 | 68 | struct hash *next; |
6a050da4 | 69 | char name[N_ALIGN(PATH_MAX)]; |
1da177e4 LT |
70 | } *head[32]; |
71 | ||
72 | static inline int hash(int major, int minor, int ino) | |
73 | { | |
74 | unsigned long tmp = ino + minor + (major << 3); | |
75 | tmp += tmp >> 5; | |
76 | return tmp & 31; | |
77 | } | |
78 | ||
2139a7fb | 79 | static char __init *find_link(int major, int minor, int ino, |
685dd2d5 | 80 | umode_t mode, char *name) |
1da177e4 LT |
81 | { |
82 | struct hash **p, *q; | |
83 | for (p = head + hash(major, minor, ino); *p; p = &(*p)->next) { | |
84 | if ((*p)->ino != ino) | |
85 | continue; | |
86 | if ((*p)->minor != minor) | |
87 | continue; | |
88 | if ((*p)->major != major) | |
89 | continue; | |
2139a7fb PA |
90 | if (((*p)->mode ^ mode) & S_IFMT) |
91 | continue; | |
1da177e4 LT |
92 | return (*p)->name; |
93 | } | |
3265e66b | 94 | q = kmalloc(sizeof(struct hash), GFP_KERNEL); |
1da177e4 | 95 | if (!q) |
dd23e809 | 96 | panic_show_mem("can't allocate link hash entry"); |
1da177e4 | 97 | q->major = major; |
2139a7fb PA |
98 | q->minor = minor; |
99 | q->ino = ino; | |
100 | q->mode = mode; | |
6a050da4 | 101 | strcpy(q->name, name); |
1da177e4 LT |
102 | q->next = NULL; |
103 | *p = q; | |
104 | return NULL; | |
105 | } | |
106 | ||
107 | static void __init free_hash(void) | |
108 | { | |
109 | struct hash **p, *q; | |
110 | for (p = head; p < head + 32; p++) { | |
111 | while (*p) { | |
112 | q = *p; | |
113 | *p = q->next; | |
3265e66b | 114 | kfree(q); |
1da177e4 LT |
115 | } |
116 | } | |
117 | } | |
118 | ||
e35c4c64 | 119 | static long __init do_utime(char *filename, time64_t mtime) |
889d51a1 | 120 | { |
aaed2dd8 | 121 | struct timespec64 t[2]; |
889d51a1 NL |
122 | |
123 | t[0].tv_sec = mtime; | |
124 | t[0].tv_nsec = 0; | |
125 | t[1].tv_sec = mtime; | |
126 | t[1].tv_nsec = 0; | |
235e5793 | 127 | return init_utimes(filename, t); |
889d51a1 NL |
128 | } |
129 | ||
130 | static __initdata LIST_HEAD(dir_list); | |
131 | struct dir_entry { | |
132 | struct list_head list; | |
133 | char *name; | |
e35c4c64 | 134 | time64_t mtime; |
889d51a1 NL |
135 | }; |
136 | ||
e35c4c64 | 137 | static void __init dir_add(const char *name, time64_t mtime) |
889d51a1 NL |
138 | { |
139 | struct dir_entry *de = kmalloc(sizeof(struct dir_entry), GFP_KERNEL); | |
140 | if (!de) | |
dd23e809 | 141 | panic_show_mem("can't allocate dir_entry buffer"); |
889d51a1 NL |
142 | INIT_LIST_HEAD(&de->list); |
143 | de->name = kstrdup(name, GFP_KERNEL); | |
144 | de->mtime = mtime; | |
145 | list_add(&de->list, &dir_list); | |
146 | } | |
147 | ||
148 | static void __init dir_utime(void) | |
149 | { | |
150 | struct dir_entry *de, *tmp; | |
151 | list_for_each_entry_safe(de, tmp, &dir_list, list) { | |
152 | list_del(&de->list); | |
153 | do_utime(de->name, de->mtime); | |
154 | kfree(de->name); | |
155 | kfree(de); | |
156 | } | |
157 | } | |
158 | ||
e35c4c64 | 159 | static __initdata time64_t mtime; |
889d51a1 | 160 | |
1da177e4 LT |
161 | /* cpio header parsing */ |
162 | ||
163 | static __initdata unsigned long ino, major, minor, nlink; | |
685dd2d5 | 164 | static __initdata umode_t mode; |
1da177e4 LT |
165 | static __initdata unsigned long body_len, name_len; |
166 | static __initdata uid_t uid; | |
167 | static __initdata gid_t gid; | |
168 | static __initdata unsigned rdev; | |
169 | ||
170 | static void __init parse_header(char *s) | |
171 | { | |
172 | unsigned long parsed[12]; | |
173 | char buf[9]; | |
174 | int i; | |
175 | ||
176 | buf[8] = '\0'; | |
177 | for (i = 0, s += 6; i < 12; i++, s += 8) { | |
178 | memcpy(buf, s, 8); | |
179 | parsed[i] = simple_strtoul(buf, NULL, 16); | |
180 | } | |
181 | ino = parsed[0]; | |
182 | mode = parsed[1]; | |
183 | uid = parsed[2]; | |
184 | gid = parsed[3]; | |
185 | nlink = parsed[4]; | |
e35c4c64 | 186 | mtime = parsed[5]; /* breaks in y2106 */ |
1da177e4 LT |
187 | body_len = parsed[6]; |
188 | major = parsed[7]; | |
189 | minor = parsed[8]; | |
190 | rdev = new_encode_dev(MKDEV(parsed[9], parsed[10])); | |
191 | name_len = parsed[11]; | |
192 | } | |
193 | ||
194 | /* FSM */ | |
195 | ||
196 | static __initdata enum state { | |
197 | Start, | |
198 | Collect, | |
199 | GotHeader, | |
200 | SkipIt, | |
201 | GotName, | |
202 | CopyFile, | |
203 | GotSymlink, | |
204 | Reset | |
205 | } state, next_state; | |
206 | ||
207 | static __initdata char *victim; | |
c34d85ac | 208 | static unsigned long byte_count __initdata; |
1da177e4 LT |
209 | static __initdata loff_t this_header, next_header; |
210 | ||
b0a5ab93 | 211 | static inline void __init eat(unsigned n) |
1da177e4 LT |
212 | { |
213 | victim += n; | |
214 | this_header += n; | |
c34d85ac | 215 | byte_count -= n; |
1da177e4 LT |
216 | } |
217 | ||
1da177e4 | 218 | static __initdata char *collected; |
d97b07c5 | 219 | static long remains __initdata; |
1da177e4 LT |
220 | static __initdata char *collect; |
221 | ||
222 | static void __init read_into(char *buf, unsigned size, enum state next) | |
223 | { | |
c34d85ac | 224 | if (byte_count >= size) { |
1da177e4 LT |
225 | collected = victim; |
226 | eat(size); | |
227 | state = next; | |
228 | } else { | |
229 | collect = collected = buf; | |
230 | remains = size; | |
231 | next_state = next; | |
232 | state = Collect; | |
233 | } | |
234 | } | |
235 | ||
236 | static __initdata char *header_buf, *symlink_buf, *name_buf; | |
237 | ||
238 | static int __init do_start(void) | |
239 | { | |
240 | read_into(header_buf, 110, GotHeader); | |
241 | return 0; | |
242 | } | |
243 | ||
244 | static int __init do_collect(void) | |
245 | { | |
d97b07c5 | 246 | unsigned long n = remains; |
c34d85ac MR |
247 | if (byte_count < n) |
248 | n = byte_count; | |
1da177e4 LT |
249 | memcpy(collect, victim, n); |
250 | eat(n); | |
251 | collect += n; | |
252 | if ((remains -= n) != 0) | |
253 | return 1; | |
254 | state = next_state; | |
255 | return 0; | |
256 | } | |
257 | ||
258 | static int __init do_header(void) | |
259 | { | |
2e591bbc AV |
260 | if (memcmp(collected, "070707", 6)==0) { |
261 | error("incorrect cpio method used: use -H newc option"); | |
262 | return 1; | |
263 | } | |
1da177e4 LT |
264 | if (memcmp(collected, "070701", 6)) { |
265 | error("no cpio magic"); | |
266 | return 1; | |
267 | } | |
268 | parse_header(collected); | |
269 | next_header = this_header + N_ALIGN(name_len) + body_len; | |
270 | next_header = (next_header + 3) & ~3; | |
1da177e4 LT |
271 | state = SkipIt; |
272 | if (name_len <= 0 || name_len > PATH_MAX) | |
273 | return 0; | |
274 | if (S_ISLNK(mode)) { | |
275 | if (body_len > PATH_MAX) | |
276 | return 0; | |
277 | collect = collected = symlink_buf; | |
278 | remains = N_ALIGN(name_len) + body_len; | |
279 | next_state = GotSymlink; | |
280 | state = Collect; | |
281 | return 0; | |
282 | } | |
283 | if (S_ISREG(mode) || !body_len) | |
284 | read_into(name_buf, N_ALIGN(name_len), GotName); | |
285 | return 0; | |
286 | } | |
287 | ||
288 | static int __init do_skip(void) | |
289 | { | |
c34d85ac MR |
290 | if (this_header + byte_count < next_header) { |
291 | eat(byte_count); | |
1da177e4 LT |
292 | return 1; |
293 | } else { | |
294 | eat(next_header - this_header); | |
295 | state = next_state; | |
296 | return 0; | |
297 | } | |
298 | } | |
299 | ||
300 | static int __init do_reset(void) | |
301 | { | |
c34d85ac | 302 | while (byte_count && *victim == '\0') |
1da177e4 | 303 | eat(1); |
c34d85ac | 304 | if (byte_count && (this_header & 3)) |
1da177e4 LT |
305 | error("broken padding"); |
306 | return 1; | |
307 | } | |
308 | ||
c34d85ac | 309 | static void __init clean_path(char *path, umode_t fmode) |
2139a7fb | 310 | { |
046aa126 | 311 | struct kstat st; |
2139a7fb | 312 | |
7b81ce7c | 313 | if (!init_stat(path, &st, AT_SYMLINK_NOFOLLOW) && |
716308a5 | 314 | (st.mode ^ fmode) & S_IFMT) { |
046aa126 | 315 | if (S_ISDIR(st.mode)) |
20cce026 | 316 | init_rmdir(path); |
2139a7fb | 317 | else |
8fb9f73e | 318 | init_unlink(path); |
2139a7fb PA |
319 | } |
320 | } | |
321 | ||
7c0950d4 LZ |
322 | static int __init maybe_link(void) |
323 | { | |
324 | if (nlink >= 2) { | |
325 | char *old = find_link(major, minor, ino, mode, collected); | |
326 | if (old) { | |
327 | clean_path(collected, 0); | |
812931d6 | 328 | return (init_link(old, collected) < 0) ? -1 : 1; |
7c0950d4 LZ |
329 | } |
330 | } | |
331 | return 0; | |
332 | } | |
333 | ||
bf6419e4 CH |
334 | static __initdata struct file *wfile; |
335 | static __initdata loff_t wfile_pos; | |
1da177e4 LT |
336 | |
337 | static int __init do_name(void) | |
338 | { | |
339 | state = SkipIt; | |
340 | next_state = Reset; | |
341 | if (strcmp(collected, "TRAILER!!!") == 0) { | |
342 | free_hash(); | |
343 | return 0; | |
344 | } | |
2139a7fb | 345 | clean_path(collected, mode); |
1da177e4 | 346 | if (S_ISREG(mode)) { |
2139a7fb PA |
347 | int ml = maybe_link(); |
348 | if (ml >= 0) { | |
349 | int openflags = O_WRONLY|O_CREAT; | |
350 | if (ml != 1) | |
351 | openflags |= O_TRUNC; | |
bf6419e4 CH |
352 | wfile = filp_open(collected, openflags, mode); |
353 | if (IS_ERR(wfile)) | |
354 | return 0; | |
355 | wfile_pos = 0; | |
356 | ||
357 | vfs_fchown(wfile, uid, gid); | |
358 | vfs_fchmod(wfile, mode); | |
359 | if (body_len) | |
360 | vfs_truncate(&wfile->f_path, body_len); | |
bf6419e4 | 361 | state = CopyFile; |
1da177e4 LT |
362 | } |
363 | } else if (S_ISDIR(mode)) { | |
83ff98c3 | 364 | init_mkdir(collected, mode); |
b873498f | 365 | init_chown(collected, uid, gid, 0); |
1097742e | 366 | init_chmod(collected, mode); |
889d51a1 | 367 | dir_add(collected, mtime); |
1da177e4 LT |
368 | } else if (S_ISBLK(mode) || S_ISCHR(mode) || |
369 | S_ISFIFO(mode) || S_ISSOCK(mode)) { | |
370 | if (maybe_link() == 0) { | |
5fee64fc | 371 | init_mknod(collected, mode, rdev); |
b873498f | 372 | init_chown(collected, uid, gid, 0); |
1097742e | 373 | init_chmod(collected, mode); |
889d51a1 | 374 | do_utime(collected, mtime); |
1da177e4 LT |
375 | } |
376 | } | |
377 | return 0; | |
378 | } | |
379 | ||
380 | static int __init do_copy(void) | |
381 | { | |
c34d85ac | 382 | if (byte_count >= body_len) { |
38b08223 | 383 | struct timespec64 t[2] = { }; |
bf6419e4 | 384 | if (xwrite(wfile, victim, body_len, &wfile_pos) != body_len) |
9687fd91 | 385 | error("write error"); |
38b08223 CH |
386 | |
387 | t[0].tv_sec = mtime; | |
388 | t[1].tv_sec = mtime; | |
389 | vfs_utimes(&wfile->f_path, t); | |
390 | ||
bf6419e4 | 391 | fput(wfile); |
1da177e4 LT |
392 | eat(body_len); |
393 | state = SkipIt; | |
394 | return 0; | |
395 | } else { | |
bf6419e4 | 396 | if (xwrite(wfile, victim, byte_count, &wfile_pos) != byte_count) |
9687fd91 | 397 | error("write error"); |
c34d85ac MR |
398 | body_len -= byte_count; |
399 | eat(byte_count); | |
1da177e4 LT |
400 | return 1; |
401 | } | |
402 | } | |
403 | ||
404 | static int __init do_symlink(void) | |
405 | { | |
406 | collected[N_ALIGN(name_len) + body_len] = '\0'; | |
2139a7fb | 407 | clean_path(collected, 0); |
cd3acb6a | 408 | init_symlink(collected + N_ALIGN(name_len), collected); |
b873498f | 409 | init_chown(collected, uid, gid, AT_SYMLINK_NOFOLLOW); |
889d51a1 | 410 | do_utime(collected, mtime); |
1da177e4 LT |
411 | state = SkipIt; |
412 | next_state = Reset; | |
413 | return 0; | |
414 | } | |
415 | ||
416 | static __initdata int (*actions[])(void) = { | |
417 | [Start] = do_start, | |
418 | [Collect] = do_collect, | |
419 | [GotHeader] = do_header, | |
420 | [SkipIt] = do_skip, | |
421 | [GotName] = do_name, | |
422 | [CopyFile] = do_copy, | |
423 | [GotSymlink] = do_symlink, | |
424 | [Reset] = do_reset, | |
425 | }; | |
426 | ||
d97b07c5 | 427 | static long __init write_buffer(char *buf, unsigned long len) |
1da177e4 | 428 | { |
c34d85ac | 429 | byte_count = len; |
1da177e4 LT |
430 | victim = buf; |
431 | ||
432 | while (!actions[state]()) | |
433 | ; | |
c34d85ac | 434 | return len - byte_count; |
1da177e4 LT |
435 | } |
436 | ||
d97b07c5 | 437 | static long __init flush_buffer(void *bufv, unsigned long len) |
1da177e4 | 438 | { |
30d65dbf | 439 | char *buf = (char *) bufv; |
d97b07c5 YL |
440 | long written; |
441 | long origLen = len; | |
1da177e4 | 442 | if (message) |
30d65dbf | 443 | return -1; |
1da177e4 LT |
444 | while ((written = write_buffer(buf, len)) < len && !message) { |
445 | char c = buf[written]; | |
446 | if (c == '0') { | |
447 | buf += written; | |
448 | len -= written; | |
449 | state = Start; | |
450 | } else if (c == 0) { | |
451 | buf += written; | |
452 | len -= written; | |
453 | state = Reset; | |
454 | } else | |
e5eed351 | 455 | error("junk within compressed archive"); |
1da177e4 | 456 | } |
30d65dbf | 457 | return origLen; |
1da177e4 LT |
458 | } |
459 | ||
d97b07c5 | 460 | static unsigned long my_inptr; /* index of next byte to be processed in inbuf */ |
1da177e4 | 461 | |
889c92d2 | 462 | #include <linux/decompress/generic.h> |
1da177e4 | 463 | |
d97b07c5 | 464 | static char * __init unpack_to_rootfs(char *buf, unsigned long len) |
1da177e4 | 465 | { |
d97b07c5 | 466 | long written; |
889c92d2 | 467 | decompress_fn decompress; |
23a22d57 PA |
468 | const char *compress_name; |
469 | static __initdata char msg_buf[64]; | |
889c92d2 | 470 | |
3265e66b TP |
471 | header_buf = kmalloc(110, GFP_KERNEL); |
472 | symlink_buf = kmalloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1, GFP_KERNEL); | |
473 | name_buf = kmalloc(N_ALIGN(PATH_MAX), GFP_KERNEL); | |
30d65dbf AK |
474 | |
475 | if (!header_buf || !symlink_buf || !name_buf) | |
dd23e809 | 476 | panic_show_mem("can't allocate buffers"); |
30d65dbf | 477 | |
1da177e4 LT |
478 | state = Start; |
479 | this_header = 0; | |
480 | message = NULL; | |
481 | while (!message && len) { | |
482 | loff_t saved_offset = this_header; | |
483 | if (*buf == '0' && !(this_header & 3)) { | |
484 | state = Start; | |
485 | written = write_buffer(buf, len); | |
486 | buf += written; | |
487 | len -= written; | |
488 | continue; | |
489 | } | |
490 | if (!*buf) { | |
491 | buf++; | |
492 | len--; | |
493 | this_header++; | |
494 | continue; | |
495 | } | |
496 | this_header = 0; | |
23a22d57 | 497 | decompress = decompress_method(buf, len, &compress_name); |
6aa7a29a | 498 | pr_debug("Detected %s compressed data\n", compress_name); |
54291362 | 499 | if (decompress) { |
d97b07c5 | 500 | int res = decompress(buf, len, NULL, flush_buffer, NULL, |
889c92d2 | 501 | &my_inptr, error); |
54291362 PL |
502 | if (res) |
503 | error("decompressor failed"); | |
504 | } else if (compress_name) { | |
23a22d57 PA |
505 | if (!message) { |
506 | snprintf(msg_buf, sizeof msg_buf, | |
507 | "compression method %s not configured", | |
508 | compress_name); | |
509 | message = msg_buf; | |
510 | } | |
df37bd15 | 511 | } else |
e5eed351 | 512 | error("invalid magic at start of compressed archive"); |
1da177e4 | 513 | if (state != Reset) |
e5eed351 | 514 | error("junk at the end of compressed archive"); |
30d65dbf AK |
515 | this_header = saved_offset + my_inptr; |
516 | buf += my_inptr; | |
517 | len -= my_inptr; | |
1da177e4 | 518 | } |
889d51a1 | 519 | dir_utime(); |
3265e66b TP |
520 | kfree(name_buf); |
521 | kfree(symlink_buf); | |
522 | kfree(header_buf); | |
1da177e4 LT |
523 | return message; |
524 | } | |
525 | ||
0a7b35cb MN |
526 | static int __initdata do_retain_initrd; |
527 | ||
528 | static int __init retain_initrd_param(char *str) | |
529 | { | |
530 | if (*str) | |
531 | return 0; | |
532 | do_retain_initrd = 1; | |
533 | return 1; | |
534 | } | |
535 | __setup("retain_initrd", retain_initrd_param); | |
536 | ||
d8ae8a37 CH |
537 | #ifdef CONFIG_ARCH_HAS_KEEPINITRD |
538 | static int __init keepinitrd_setup(char *__unused) | |
539 | { | |
540 | do_retain_initrd = 1; | |
541 | return 1; | |
542 | } | |
543 | __setup("keepinitrd", keepinitrd_setup); | |
544 | #endif | |
545 | ||
e7cb072e RV |
546 | static bool __initdata initramfs_async = true; |
547 | static int __init initramfs_async_setup(char *str) | |
548 | { | |
549 | strtobool(str, &initramfs_async); | |
550 | return 1; | |
551 | } | |
552 | __setup("initramfs_async=", initramfs_async_setup); | |
553 | ||
ffe8018c HB |
554 | extern char __initramfs_start[]; |
555 | extern unsigned long __initramfs_size; | |
1da177e4 | 556 | #include <linux/initrd.h> |
9c15e852 | 557 | #include <linux/kexec.h> |
0f3d2bd5 | 558 | |
c72160fe KW |
559 | void __init reserve_initrd_mem(void) |
560 | { | |
561 | phys_addr_t start; | |
562 | unsigned long size; | |
563 | ||
564 | /* Ignore the virtul address computed during device tree parsing */ | |
565 | initrd_start = initrd_end = 0; | |
566 | ||
567 | if (!phys_initrd_size) | |
568 | return; | |
569 | /* | |
570 | * Round the memory region to page boundaries as per free_initrd_mem() | |
571 | * This allows us to detect whether the pages overlapping the initrd | |
572 | * are in use, but more importantly, reserves the entire set of pages | |
573 | * as we don't want these pages allocated for other purposes. | |
574 | */ | |
575 | start = round_down(phys_initrd_start, PAGE_SIZE); | |
576 | size = phys_initrd_size + (phys_initrd_start - start); | |
577 | size = round_up(size, PAGE_SIZE); | |
578 | ||
579 | if (!memblock_is_region_memory(start, size)) { | |
580 | pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region", | |
581 | (u64)start, size); | |
582 | goto disable; | |
583 | } | |
584 | ||
585 | if (memblock_is_region_reserved(start, size)) { | |
586 | pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region\n", | |
587 | (u64)start, size); | |
588 | goto disable; | |
589 | } | |
590 | ||
591 | memblock_reserve(start, size); | |
592 | /* Now convert initrd to virtual addresses */ | |
593 | initrd_start = (unsigned long)__va(phys_initrd_start); | |
594 | initrd_end = initrd_start + phys_initrd_size; | |
595 | initrd_below_start_ok = 1; | |
596 | ||
597 | return; | |
598 | disable: | |
599 | pr_cont(" - disabling initrd\n"); | |
600 | initrd_start = 0; | |
601 | initrd_end = 0; | |
602 | } | |
603 | ||
55d5b7dd | 604 | void __weak __init free_initrd_mem(unsigned long start, unsigned long end) |
4afd58e1 | 605 | { |
899ee4af MR |
606 | #ifdef CONFIG_ARCH_KEEP_MEMBLOCK |
607 | unsigned long aligned_start = ALIGN_DOWN(start, PAGE_SIZE); | |
608 | unsigned long aligned_end = ALIGN(end, PAGE_SIZE); | |
609 | ||
4421cca0 | 610 | memblock_free((void *)aligned_start, aligned_end - aligned_start); |
899ee4af MR |
611 | #endif |
612 | ||
f94f7434 CH |
613 | free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM, |
614 | "initrd"); | |
4afd58e1 CH |
615 | } |
616 | ||
2965faa5 | 617 | #ifdef CONFIG_KEXEC_CORE |
e99332e7 | 618 | static bool __init kexec_free_initrd(void) |
23091e28 | 619 | { |
9c15e852 HM |
620 | unsigned long crashk_start = (unsigned long)__va(crashk_res.start); |
621 | unsigned long crashk_end = (unsigned long)__va(crashk_res.end); | |
622 | ||
623 | /* | |
624 | * If the initrd region is overlapped with crashkernel reserved region, | |
625 | * free only memory that is not part of crashkernel region. | |
626 | */ | |
23091e28 CH |
627 | if (initrd_start >= crashk_end || initrd_end <= crashk_start) |
628 | return false; | |
629 | ||
630 | /* | |
631 | * Initialize initrd memory region since the kexec boot does not do. | |
632 | */ | |
633 | memset((void *)initrd_start, 0, initrd_end - initrd_start); | |
634 | if (initrd_start < crashk_start) | |
635 | free_initrd_mem(initrd_start, crashk_start); | |
636 | if (initrd_end > crashk_end) | |
637 | free_initrd_mem(crashk_end, initrd_end); | |
638 | return true; | |
0f3d2bd5 | 639 | } |
23091e28 CH |
640 | #else |
641 | static inline bool kexec_free_initrd(void) | |
642 | { | |
643 | return false; | |
644 | } | |
645 | #endif /* CONFIG_KEXEC_CORE */ | |
0f3d2bd5 | 646 | |
a841c673 | 647 | #ifdef CONFIG_BLK_DEV_RAM |
4ada1e81 | 648 | static void __init populate_initrd_image(char *err) |
7c184ecd CH |
649 | { |
650 | ssize_t written; | |
bf6419e4 CH |
651 | struct file *file; |
652 | loff_t pos = 0; | |
7c184ecd CH |
653 | |
654 | unpack_to_rootfs(__initramfs_start, __initramfs_size); | |
655 | ||
656 | printk(KERN_INFO "rootfs image is not initramfs (%s); looks like an initrd\n", | |
657 | err); | |
bf6419e4 CH |
658 | file = filp_open("/initrd.image", O_WRONLY | O_CREAT, 0700); |
659 | if (IS_ERR(file)) | |
7c184ecd CH |
660 | return; |
661 | ||
bf6419e4 CH |
662 | written = xwrite(file, (char *)initrd_start, initrd_end - initrd_start, |
663 | &pos); | |
7c184ecd CH |
664 | if (written != initrd_end - initrd_start) |
665 | pr_err("/initrd.image: incomplete write (%zd != %ld)\n", | |
666 | written, initrd_end - initrd_start); | |
bf6419e4 | 667 | fput(file); |
7c184ecd CH |
668 | } |
669 | #endif /* CONFIG_BLK_DEV_RAM */ | |
670 | ||
e7cb072e | 671 | static void __init do_populate_rootfs(void *unused, async_cookie_t cookie) |
1da177e4 | 672 | { |
17a9be31 | 673 | /* Load the built in initramfs */ |
ffe8018c | 674 | char *err = unpack_to_rootfs(__initramfs_start, __initramfs_size); |
1da177e4 | 675 | if (err) |
dd23e809 | 676 | panic_show_mem("%s", err); /* Failed to decompress INTERNAL initramfs */ |
afef7889 CH |
677 | |
678 | if (!initrd_start || IS_ENABLED(CONFIG_INITRAMFS_FORCE)) | |
679 | goto done; | |
680 | ||
681 | if (IS_ENABLED(CONFIG_BLK_DEV_RAM)) | |
a1e6b6c1 | 682 | printk(KERN_INFO "Trying to unpack rootfs image as initramfs...\n"); |
afef7889 CH |
683 | else |
684 | printk(KERN_INFO "Unpacking initramfs...\n"); | |
54c7a891 | 685 | |
afef7889 CH |
686 | err = unpack_to_rootfs((char *)initrd_start, initrd_end - initrd_start); |
687 | if (err) { | |
9ab6b718 | 688 | #ifdef CONFIG_BLK_DEV_RAM |
7c184ecd | 689 | populate_initrd_image(err); |
9ab6b718 CH |
690 | #else |
691 | printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err); | |
692 | #endif | |
1da177e4 | 693 | } |
23091e28 | 694 | |
afef7889 | 695 | done: |
23091e28 CH |
696 | /* |
697 | * If the initrd region is overlapped with crashkernel reserved region, | |
698 | * free only memory that is not part of crashkernel region. | |
699 | */ | |
5d59aa8f | 700 | if (!do_retain_initrd && initrd_start && !kexec_free_initrd()) |
23091e28 CH |
701 | free_initrd_mem(initrd_start, initrd_end); |
702 | initrd_start = 0; | |
703 | initrd_end = 0; | |
704 | ||
17a9be31 | 705 | flush_delayed_fput(); |
e7cb072e RV |
706 | } |
707 | ||
708 | static ASYNC_DOMAIN_EXCLUSIVE(initramfs_domain); | |
709 | static async_cookie_t initramfs_cookie; | |
710 | ||
711 | void wait_for_initramfs(void) | |
712 | { | |
713 | if (!initramfs_cookie) { | |
714 | /* | |
715 | * Something before rootfs_initcall wants to access | |
716 | * the filesystem/initramfs. Probably a bug. Make a | |
717 | * note, avoid deadlocking the machine, and let the | |
718 | * caller's access fail as it used to. | |
719 | */ | |
720 | pr_warn_once("wait_for_initramfs() called before rootfs_initcalls\n"); | |
721 | return; | |
722 | } | |
723 | async_synchronize_cookie_domain(initramfs_cookie + 1, &initramfs_domain); | |
724 | } | |
725 | EXPORT_SYMBOL_GPL(wait_for_initramfs); | |
726 | ||
727 | static int __init populate_rootfs(void) | |
728 | { | |
729 | initramfs_cookie = async_schedule_domain(do_populate_rootfs, NULL, | |
730 | &initramfs_domain); | |
b234ed6d | 731 | usermodehelper_enable(); |
e7cb072e RV |
732 | if (!initramfs_async) |
733 | wait_for_initramfs(); | |
8d610dd5 | 734 | return 0; |
1da177e4 | 735 | } |
8d610dd5 | 736 | rootfs_initcall(populate_rootfs); |