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 | ||
dd23e809 FF |
63 | static void panic_show_mem(const char *fmt, ...) |
64 | { | |
65 | va_list args; | |
66 | ||
67 | show_mem(0, NULL); | |
68 | va_start(args, fmt); | |
69 | panic(fmt, args); | |
70 | va_end(args); | |
71 | } | |
72 | ||
1da177e4 LT |
73 | /* link hash */ |
74 | ||
6a050da4 MH |
75 | #define N_ALIGN(len) ((((len) + 1) & ~3) + 2) |
76 | ||
1da177e4 LT |
77 | static __initdata struct hash { |
78 | int ino, minor, major; | |
685dd2d5 | 79 | umode_t mode; |
1da177e4 | 80 | struct hash *next; |
6a050da4 | 81 | char name[N_ALIGN(PATH_MAX)]; |
1da177e4 LT |
82 | } *head[32]; |
83 | ||
84 | static inline int hash(int major, int minor, int ino) | |
85 | { | |
86 | unsigned long tmp = ino + minor + (major << 3); | |
87 | tmp += tmp >> 5; | |
88 | return tmp & 31; | |
89 | } | |
90 | ||
2139a7fb | 91 | static char __init *find_link(int major, int minor, int ino, |
685dd2d5 | 92 | umode_t mode, char *name) |
1da177e4 LT |
93 | { |
94 | struct hash **p, *q; | |
95 | for (p = head + hash(major, minor, ino); *p; p = &(*p)->next) { | |
96 | if ((*p)->ino != ino) | |
97 | continue; | |
98 | if ((*p)->minor != minor) | |
99 | continue; | |
100 | if ((*p)->major != major) | |
101 | continue; | |
2139a7fb PA |
102 | if (((*p)->mode ^ mode) & S_IFMT) |
103 | continue; | |
1da177e4 LT |
104 | return (*p)->name; |
105 | } | |
3265e66b | 106 | q = kmalloc(sizeof(struct hash), GFP_KERNEL); |
1da177e4 | 107 | if (!q) |
dd23e809 | 108 | panic_show_mem("can't allocate link hash entry"); |
1da177e4 | 109 | q->major = major; |
2139a7fb PA |
110 | q->minor = minor; |
111 | q->ino = ino; | |
112 | q->mode = mode; | |
6a050da4 | 113 | strcpy(q->name, name); |
1da177e4 LT |
114 | q->next = NULL; |
115 | *p = q; | |
116 | return NULL; | |
117 | } | |
118 | ||
119 | static void __init free_hash(void) | |
120 | { | |
121 | struct hash **p, *q; | |
122 | for (p = head; p < head + 32; p++) { | |
123 | while (*p) { | |
124 | q = *p; | |
125 | *p = q->next; | |
3265e66b | 126 | kfree(q); |
1da177e4 LT |
127 | } |
128 | } | |
129 | } | |
130 | ||
1274aea1 DD |
131 | #ifdef CONFIG_INITRAMFS_PRESERVE_MTIME |
132 | static void __init do_utime(char *filename, time64_t mtime) | |
889d51a1 | 133 | { |
1274aea1 DD |
134 | struct timespec64 t[2] = { { .tv_sec = mtime }, { .tv_sec = mtime } }; |
135 | init_utimes(filename, t); | |
136 | } | |
889d51a1 | 137 | |
1274aea1 DD |
138 | static void __init do_utime_path(const struct path *path, time64_t mtime) |
139 | { | |
140 | struct timespec64 t[2] = { { .tv_sec = mtime }, { .tv_sec = mtime } }; | |
141 | vfs_utimes(path, t); | |
889d51a1 NL |
142 | } |
143 | ||
144 | static __initdata LIST_HEAD(dir_list); | |
145 | struct dir_entry { | |
146 | struct list_head list; | |
e35c4c64 | 147 | time64_t mtime; |
fcb7aedd | 148 | char name[]; |
889d51a1 NL |
149 | }; |
150 | ||
e35c4c64 | 151 | static void __init dir_add(const char *name, time64_t mtime) |
889d51a1 | 152 | { |
fcb7aedd DD |
153 | size_t nlen = strlen(name) + 1; |
154 | struct dir_entry *de; | |
155 | ||
156 | de = kmalloc(sizeof(struct dir_entry) + nlen, GFP_KERNEL); | |
889d51a1 | 157 | if (!de) |
dd23e809 | 158 | panic_show_mem("can't allocate dir_entry buffer"); |
889d51a1 | 159 | INIT_LIST_HEAD(&de->list); |
fcb7aedd | 160 | strscpy(de->name, name, nlen); |
889d51a1 NL |
161 | de->mtime = mtime; |
162 | list_add(&de->list, &dir_list); | |
163 | } | |
164 | ||
165 | static void __init dir_utime(void) | |
166 | { | |
167 | struct dir_entry *de, *tmp; | |
168 | list_for_each_entry_safe(de, tmp, &dir_list, list) { | |
169 | list_del(&de->list); | |
170 | do_utime(de->name, de->mtime); | |
889d51a1 NL |
171 | kfree(de); |
172 | } | |
173 | } | |
1274aea1 DD |
174 | #else |
175 | static void __init do_utime(char *filename, time64_t mtime) {} | |
176 | static void __init do_utime_path(const struct path *path, time64_t mtime) {} | |
177 | static void __init dir_add(const char *name, time64_t mtime) {} | |
178 | static void __init dir_utime(void) {} | |
179 | #endif | |
889d51a1 | 180 | |
e35c4c64 | 181 | static __initdata time64_t mtime; |
889d51a1 | 182 | |
1da177e4 LT |
183 | /* cpio header parsing */ |
184 | ||
185 | static __initdata unsigned long ino, major, minor, nlink; | |
685dd2d5 | 186 | static __initdata umode_t mode; |
1da177e4 LT |
187 | static __initdata unsigned long body_len, name_len; |
188 | static __initdata uid_t uid; | |
189 | static __initdata gid_t gid; | |
190 | static __initdata unsigned rdev; | |
800c24dc | 191 | static __initdata u32 hdr_csum; |
1da177e4 LT |
192 | |
193 | static void __init parse_header(char *s) | |
194 | { | |
800c24dc | 195 | unsigned long parsed[13]; |
1da177e4 LT |
196 | char buf[9]; |
197 | int i; | |
198 | ||
199 | buf[8] = '\0'; | |
800c24dc | 200 | for (i = 0, s += 6; i < 13; i++, s += 8) { |
1da177e4 LT |
201 | memcpy(buf, s, 8); |
202 | parsed[i] = simple_strtoul(buf, NULL, 16); | |
203 | } | |
204 | ino = parsed[0]; | |
205 | mode = parsed[1]; | |
206 | uid = parsed[2]; | |
207 | gid = parsed[3]; | |
208 | nlink = parsed[4]; | |
e35c4c64 | 209 | mtime = parsed[5]; /* breaks in y2106 */ |
1da177e4 LT |
210 | body_len = parsed[6]; |
211 | major = parsed[7]; | |
212 | minor = parsed[8]; | |
213 | rdev = new_encode_dev(MKDEV(parsed[9], parsed[10])); | |
214 | name_len = parsed[11]; | |
800c24dc | 215 | hdr_csum = parsed[12]; |
1da177e4 LT |
216 | } |
217 | ||
218 | /* FSM */ | |
219 | ||
220 | static __initdata enum state { | |
221 | Start, | |
222 | Collect, | |
223 | GotHeader, | |
224 | SkipIt, | |
225 | GotName, | |
226 | CopyFile, | |
227 | GotSymlink, | |
228 | Reset | |
229 | } state, next_state; | |
230 | ||
231 | static __initdata char *victim; | |
c34d85ac | 232 | static unsigned long byte_count __initdata; |
1da177e4 LT |
233 | static __initdata loff_t this_header, next_header; |
234 | ||
b0a5ab93 | 235 | static inline void __init eat(unsigned n) |
1da177e4 LT |
236 | { |
237 | victim += n; | |
238 | this_header += n; | |
c34d85ac | 239 | byte_count -= n; |
1da177e4 LT |
240 | } |
241 | ||
1da177e4 | 242 | static __initdata char *collected; |
d97b07c5 | 243 | static long remains __initdata; |
1da177e4 LT |
244 | static __initdata char *collect; |
245 | ||
246 | static void __init read_into(char *buf, unsigned size, enum state next) | |
247 | { | |
c34d85ac | 248 | if (byte_count >= size) { |
1da177e4 LT |
249 | collected = victim; |
250 | eat(size); | |
251 | state = next; | |
252 | } else { | |
253 | collect = collected = buf; | |
254 | remains = size; | |
255 | next_state = next; | |
256 | state = Collect; | |
257 | } | |
258 | } | |
259 | ||
260 | static __initdata char *header_buf, *symlink_buf, *name_buf; | |
261 | ||
262 | static int __init do_start(void) | |
263 | { | |
264 | read_into(header_buf, 110, GotHeader); | |
265 | return 0; | |
266 | } | |
267 | ||
268 | static int __init do_collect(void) | |
269 | { | |
d97b07c5 | 270 | unsigned long n = remains; |
c34d85ac MR |
271 | if (byte_count < n) |
272 | n = byte_count; | |
1da177e4 LT |
273 | memcpy(collect, victim, n); |
274 | eat(n); | |
275 | collect += n; | |
276 | if ((remains -= n) != 0) | |
277 | return 1; | |
278 | state = next_state; | |
279 | return 0; | |
280 | } | |
281 | ||
282 | static int __init do_header(void) | |
283 | { | |
800c24dc DD |
284 | if (!memcmp(collected, "070701", 6)) { |
285 | csum_present = false; | |
286 | } else if (!memcmp(collected, "070702", 6)) { | |
287 | csum_present = true; | |
288 | } else { | |
da028e4c DD |
289 | if (memcmp(collected, "070707", 6) == 0) |
290 | error("incorrect cpio method used: use -H newc option"); | |
291 | else | |
292 | error("no cpio magic"); | |
1da177e4 LT |
293 | return 1; |
294 | } | |
295 | parse_header(collected); | |
296 | next_header = this_header + N_ALIGN(name_len) + body_len; | |
297 | next_header = (next_header + 3) & ~3; | |
1da177e4 LT |
298 | state = SkipIt; |
299 | if (name_len <= 0 || name_len > PATH_MAX) | |
300 | return 0; | |
301 | if (S_ISLNK(mode)) { | |
302 | if (body_len > PATH_MAX) | |
303 | return 0; | |
304 | collect = collected = symlink_buf; | |
305 | remains = N_ALIGN(name_len) + body_len; | |
306 | next_state = GotSymlink; | |
307 | state = Collect; | |
308 | return 0; | |
309 | } | |
310 | if (S_ISREG(mode) || !body_len) | |
311 | read_into(name_buf, N_ALIGN(name_len), GotName); | |
312 | return 0; | |
313 | } | |
314 | ||
315 | static int __init do_skip(void) | |
316 | { | |
c34d85ac MR |
317 | if (this_header + byte_count < next_header) { |
318 | eat(byte_count); | |
1da177e4 LT |
319 | return 1; |
320 | } else { | |
321 | eat(next_header - this_header); | |
322 | state = next_state; | |
323 | return 0; | |
324 | } | |
325 | } | |
326 | ||
327 | static int __init do_reset(void) | |
328 | { | |
c34d85ac | 329 | while (byte_count && *victim == '\0') |
1da177e4 | 330 | eat(1); |
c34d85ac | 331 | if (byte_count && (this_header & 3)) |
1da177e4 LT |
332 | error("broken padding"); |
333 | return 1; | |
334 | } | |
335 | ||
c34d85ac | 336 | static void __init clean_path(char *path, umode_t fmode) |
2139a7fb | 337 | { |
046aa126 | 338 | struct kstat st; |
2139a7fb | 339 | |
7b81ce7c | 340 | if (!init_stat(path, &st, AT_SYMLINK_NOFOLLOW) && |
716308a5 | 341 | (st.mode ^ fmode) & S_IFMT) { |
046aa126 | 342 | if (S_ISDIR(st.mode)) |
20cce026 | 343 | init_rmdir(path); |
2139a7fb | 344 | else |
8fb9f73e | 345 | init_unlink(path); |
2139a7fb PA |
346 | } |
347 | } | |
348 | ||
7c0950d4 LZ |
349 | static int __init maybe_link(void) |
350 | { | |
351 | if (nlink >= 2) { | |
352 | char *old = find_link(major, minor, ino, mode, collected); | |
353 | if (old) { | |
354 | clean_path(collected, 0); | |
812931d6 | 355 | return (init_link(old, collected) < 0) ? -1 : 1; |
7c0950d4 LZ |
356 | } |
357 | } | |
358 | return 0; | |
359 | } | |
360 | ||
bf6419e4 CH |
361 | static __initdata struct file *wfile; |
362 | static __initdata loff_t wfile_pos; | |
1da177e4 LT |
363 | |
364 | static int __init do_name(void) | |
365 | { | |
366 | state = SkipIt; | |
367 | next_state = Reset; | |
368 | if (strcmp(collected, "TRAILER!!!") == 0) { | |
369 | free_hash(); | |
370 | return 0; | |
371 | } | |
2139a7fb | 372 | clean_path(collected, mode); |
1da177e4 | 373 | if (S_ISREG(mode)) { |
2139a7fb PA |
374 | int ml = maybe_link(); |
375 | if (ml >= 0) { | |
376 | int openflags = O_WRONLY|O_CREAT; | |
377 | if (ml != 1) | |
378 | openflags |= O_TRUNC; | |
bf6419e4 CH |
379 | wfile = filp_open(collected, openflags, mode); |
380 | if (IS_ERR(wfile)) | |
381 | return 0; | |
382 | wfile_pos = 0; | |
800c24dc | 383 | io_csum = 0; |
bf6419e4 CH |
384 | |
385 | vfs_fchown(wfile, uid, gid); | |
386 | vfs_fchmod(wfile, mode); | |
387 | if (body_len) | |
388 | vfs_truncate(&wfile->f_path, body_len); | |
bf6419e4 | 389 | state = CopyFile; |
1da177e4 LT |
390 | } |
391 | } else if (S_ISDIR(mode)) { | |
83ff98c3 | 392 | init_mkdir(collected, mode); |
b873498f | 393 | init_chown(collected, uid, gid, 0); |
1097742e | 394 | init_chmod(collected, mode); |
889d51a1 | 395 | dir_add(collected, mtime); |
1da177e4 LT |
396 | } else if (S_ISBLK(mode) || S_ISCHR(mode) || |
397 | S_ISFIFO(mode) || S_ISSOCK(mode)) { | |
398 | if (maybe_link() == 0) { | |
5fee64fc | 399 | init_mknod(collected, mode, rdev); |
b873498f | 400 | init_chown(collected, uid, gid, 0); |
1097742e | 401 | init_chmod(collected, mode); |
889d51a1 | 402 | do_utime(collected, mtime); |
1da177e4 LT |
403 | } |
404 | } | |
405 | return 0; | |
406 | } | |
407 | ||
408 | static int __init do_copy(void) | |
409 | { | |
c34d85ac | 410 | if (byte_count >= body_len) { |
bf6419e4 | 411 | if (xwrite(wfile, victim, body_len, &wfile_pos) != body_len) |
9687fd91 | 412 | error("write error"); |
38b08223 | 413 | |
1274aea1 | 414 | do_utime_path(&wfile->f_path, mtime); |
bf6419e4 | 415 | fput(wfile); |
800c24dc DD |
416 | if (csum_present && io_csum != hdr_csum) |
417 | error("bad data checksum"); | |
1da177e4 LT |
418 | eat(body_len); |
419 | state = SkipIt; | |
420 | return 0; | |
421 | } else { | |
bf6419e4 | 422 | if (xwrite(wfile, victim, byte_count, &wfile_pos) != byte_count) |
9687fd91 | 423 | error("write error"); |
c34d85ac MR |
424 | body_len -= byte_count; |
425 | eat(byte_count); | |
1da177e4 LT |
426 | return 1; |
427 | } | |
428 | } | |
429 | ||
430 | static int __init do_symlink(void) | |
431 | { | |
432 | collected[N_ALIGN(name_len) + body_len] = '\0'; | |
2139a7fb | 433 | clean_path(collected, 0); |
cd3acb6a | 434 | init_symlink(collected + N_ALIGN(name_len), collected); |
b873498f | 435 | init_chown(collected, uid, gid, AT_SYMLINK_NOFOLLOW); |
889d51a1 | 436 | do_utime(collected, mtime); |
1da177e4 LT |
437 | state = SkipIt; |
438 | next_state = Reset; | |
439 | return 0; | |
440 | } | |
441 | ||
442 | static __initdata int (*actions[])(void) = { | |
443 | [Start] = do_start, | |
444 | [Collect] = do_collect, | |
445 | [GotHeader] = do_header, | |
446 | [SkipIt] = do_skip, | |
447 | [GotName] = do_name, | |
448 | [CopyFile] = do_copy, | |
449 | [GotSymlink] = do_symlink, | |
450 | [Reset] = do_reset, | |
451 | }; | |
452 | ||
d97b07c5 | 453 | static long __init write_buffer(char *buf, unsigned long len) |
1da177e4 | 454 | { |
c34d85ac | 455 | byte_count = len; |
1da177e4 LT |
456 | victim = buf; |
457 | ||
458 | while (!actions[state]()) | |
459 | ; | |
c34d85ac | 460 | return len - byte_count; |
1da177e4 LT |
461 | } |
462 | ||
d97b07c5 | 463 | static long __init flush_buffer(void *bufv, unsigned long len) |
1da177e4 | 464 | { |
4197530b | 465 | char *buf = bufv; |
d97b07c5 YL |
466 | long written; |
467 | long origLen = len; | |
1da177e4 | 468 | if (message) |
30d65dbf | 469 | return -1; |
1da177e4 LT |
470 | while ((written = write_buffer(buf, len)) < len && !message) { |
471 | char c = buf[written]; | |
472 | if (c == '0') { | |
473 | buf += written; | |
474 | len -= written; | |
475 | state = Start; | |
476 | } else if (c == 0) { | |
477 | buf += written; | |
478 | len -= written; | |
479 | state = Reset; | |
480 | } else | |
e5eed351 | 481 | error("junk within compressed archive"); |
1da177e4 | 482 | } |
30d65dbf | 483 | return origLen; |
1da177e4 LT |
484 | } |
485 | ||
199cda13 | 486 | static unsigned long my_inptr __initdata; /* index of next byte to be processed in inbuf */ |
1da177e4 | 487 | |
889c92d2 | 488 | #include <linux/decompress/generic.h> |
1da177e4 | 489 | |
d97b07c5 | 490 | static char * __init unpack_to_rootfs(char *buf, unsigned long len) |
1da177e4 | 491 | { |
d97b07c5 | 492 | long written; |
889c92d2 | 493 | decompress_fn decompress; |
23a22d57 PA |
494 | const char *compress_name; |
495 | static __initdata char msg_buf[64]; | |
889c92d2 | 496 | |
3265e66b TP |
497 | header_buf = kmalloc(110, GFP_KERNEL); |
498 | symlink_buf = kmalloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1, GFP_KERNEL); | |
499 | name_buf = kmalloc(N_ALIGN(PATH_MAX), GFP_KERNEL); | |
30d65dbf AK |
500 | |
501 | if (!header_buf || !symlink_buf || !name_buf) | |
dd23e809 | 502 | panic_show_mem("can't allocate buffers"); |
30d65dbf | 503 | |
1da177e4 LT |
504 | state = Start; |
505 | this_header = 0; | |
506 | message = NULL; | |
507 | while (!message && len) { | |
508 | loff_t saved_offset = this_header; | |
509 | if (*buf == '0' && !(this_header & 3)) { | |
510 | state = Start; | |
511 | written = write_buffer(buf, len); | |
512 | buf += written; | |
513 | len -= written; | |
514 | continue; | |
515 | } | |
516 | if (!*buf) { | |
517 | buf++; | |
518 | len--; | |
519 | this_header++; | |
520 | continue; | |
521 | } | |
522 | this_header = 0; | |
23a22d57 | 523 | decompress = decompress_method(buf, len, &compress_name); |
6aa7a29a | 524 | pr_debug("Detected %s compressed data\n", compress_name); |
54291362 | 525 | if (decompress) { |
d97b07c5 | 526 | int res = decompress(buf, len, NULL, flush_buffer, NULL, |
889c92d2 | 527 | &my_inptr, error); |
54291362 PL |
528 | if (res) |
529 | error("decompressor failed"); | |
530 | } else if (compress_name) { | |
23a22d57 PA |
531 | if (!message) { |
532 | snprintf(msg_buf, sizeof msg_buf, | |
533 | "compression method %s not configured", | |
534 | compress_name); | |
535 | message = msg_buf; | |
536 | } | |
df37bd15 | 537 | } else |
e5eed351 | 538 | error("invalid magic at start of compressed archive"); |
1da177e4 | 539 | if (state != Reset) |
e5eed351 | 540 | error("junk at the end of compressed archive"); |
30d65dbf AK |
541 | this_header = saved_offset + my_inptr; |
542 | buf += my_inptr; | |
543 | len -= my_inptr; | |
1da177e4 | 544 | } |
889d51a1 | 545 | dir_utime(); |
3265e66b TP |
546 | kfree(name_buf); |
547 | kfree(symlink_buf); | |
548 | kfree(header_buf); | |
1da177e4 LT |
549 | return message; |
550 | } | |
551 | ||
0a7b35cb MN |
552 | static int __initdata do_retain_initrd; |
553 | ||
554 | static int __init retain_initrd_param(char *str) | |
555 | { | |
556 | if (*str) | |
557 | return 0; | |
558 | do_retain_initrd = 1; | |
559 | return 1; | |
560 | } | |
561 | __setup("retain_initrd", retain_initrd_param); | |
562 | ||
d8ae8a37 CH |
563 | #ifdef CONFIG_ARCH_HAS_KEEPINITRD |
564 | static int __init keepinitrd_setup(char *__unused) | |
565 | { | |
566 | do_retain_initrd = 1; | |
567 | return 1; | |
568 | } | |
569 | __setup("keepinitrd", keepinitrd_setup); | |
570 | #endif | |
571 | ||
e7cb072e RV |
572 | static bool __initdata initramfs_async = true; |
573 | static int __init initramfs_async_setup(char *str) | |
574 | { | |
f3296f80 | 575 | return kstrtobool(str, &initramfs_async) == 0; |
e7cb072e RV |
576 | } |
577 | __setup("initramfs_async=", initramfs_async_setup); | |
578 | ||
ffe8018c HB |
579 | extern char __initramfs_start[]; |
580 | extern unsigned long __initramfs_size; | |
1da177e4 | 581 | #include <linux/initrd.h> |
9c15e852 | 582 | #include <linux/kexec.h> |
0f3d2bd5 | 583 | |
c72160fe KW |
584 | void __init reserve_initrd_mem(void) |
585 | { | |
586 | phys_addr_t start; | |
587 | unsigned long size; | |
588 | ||
589 | /* Ignore the virtul address computed during device tree parsing */ | |
590 | initrd_start = initrd_end = 0; | |
591 | ||
592 | if (!phys_initrd_size) | |
593 | return; | |
594 | /* | |
595 | * Round the memory region to page boundaries as per free_initrd_mem() | |
596 | * This allows us to detect whether the pages overlapping the initrd | |
597 | * are in use, but more importantly, reserves the entire set of pages | |
598 | * as we don't want these pages allocated for other purposes. | |
599 | */ | |
600 | start = round_down(phys_initrd_start, PAGE_SIZE); | |
601 | size = phys_initrd_size + (phys_initrd_start - start); | |
602 | size = round_up(size, PAGE_SIZE); | |
603 | ||
604 | if (!memblock_is_region_memory(start, size)) { | |
605 | pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region", | |
606 | (u64)start, size); | |
607 | goto disable; | |
608 | } | |
609 | ||
610 | if (memblock_is_region_reserved(start, size)) { | |
611 | pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region\n", | |
612 | (u64)start, size); | |
613 | goto disable; | |
614 | } | |
615 | ||
616 | memblock_reserve(start, size); | |
617 | /* Now convert initrd to virtual addresses */ | |
618 | initrd_start = (unsigned long)__va(phys_initrd_start); | |
619 | initrd_end = initrd_start + phys_initrd_size; | |
620 | initrd_below_start_ok = 1; | |
621 | ||
622 | return; | |
623 | disable: | |
624 | pr_cont(" - disabling initrd\n"); | |
625 | initrd_start = 0; | |
626 | initrd_end = 0; | |
627 | } | |
628 | ||
55d5b7dd | 629 | void __weak __init free_initrd_mem(unsigned long start, unsigned long end) |
4afd58e1 | 630 | { |
899ee4af MR |
631 | #ifdef CONFIG_ARCH_KEEP_MEMBLOCK |
632 | unsigned long aligned_start = ALIGN_DOWN(start, PAGE_SIZE); | |
633 | unsigned long aligned_end = ALIGN(end, PAGE_SIZE); | |
634 | ||
4421cca0 | 635 | memblock_free((void *)aligned_start, aligned_end - aligned_start); |
899ee4af MR |
636 | #endif |
637 | ||
f94f7434 CH |
638 | free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM, |
639 | "initrd"); | |
4afd58e1 CH |
640 | } |
641 | ||
2965faa5 | 642 | #ifdef CONFIG_KEXEC_CORE |
e99332e7 | 643 | static bool __init kexec_free_initrd(void) |
23091e28 | 644 | { |
9c15e852 HM |
645 | unsigned long crashk_start = (unsigned long)__va(crashk_res.start); |
646 | unsigned long crashk_end = (unsigned long)__va(crashk_res.end); | |
647 | ||
648 | /* | |
649 | * If the initrd region is overlapped with crashkernel reserved region, | |
650 | * free only memory that is not part of crashkernel region. | |
651 | */ | |
23091e28 CH |
652 | if (initrd_start >= crashk_end || initrd_end <= crashk_start) |
653 | return false; | |
654 | ||
655 | /* | |
656 | * Initialize initrd memory region since the kexec boot does not do. | |
657 | */ | |
658 | memset((void *)initrd_start, 0, initrd_end - initrd_start); | |
659 | if (initrd_start < crashk_start) | |
660 | free_initrd_mem(initrd_start, crashk_start); | |
661 | if (initrd_end > crashk_end) | |
662 | free_initrd_mem(crashk_end, initrd_end); | |
663 | return true; | |
0f3d2bd5 | 664 | } |
23091e28 CH |
665 | #else |
666 | static inline bool kexec_free_initrd(void) | |
667 | { | |
668 | return false; | |
669 | } | |
670 | #endif /* CONFIG_KEXEC_CORE */ | |
0f3d2bd5 | 671 | |
a841c673 | 672 | #ifdef CONFIG_BLK_DEV_RAM |
4ada1e81 | 673 | static void __init populate_initrd_image(char *err) |
7c184ecd CH |
674 | { |
675 | ssize_t written; | |
bf6419e4 CH |
676 | struct file *file; |
677 | loff_t pos = 0; | |
7c184ecd CH |
678 | |
679 | unpack_to_rootfs(__initramfs_start, __initramfs_size); | |
680 | ||
681 | printk(KERN_INFO "rootfs image is not initramfs (%s); looks like an initrd\n", | |
682 | err); | |
bf6419e4 CH |
683 | file = filp_open("/initrd.image", O_WRONLY | O_CREAT, 0700); |
684 | if (IS_ERR(file)) | |
7c184ecd CH |
685 | return; |
686 | ||
bf6419e4 CH |
687 | written = xwrite(file, (char *)initrd_start, initrd_end - initrd_start, |
688 | &pos); | |
7c184ecd CH |
689 | if (written != initrd_end - initrd_start) |
690 | pr_err("/initrd.image: incomplete write (%zd != %ld)\n", | |
691 | written, initrd_end - initrd_start); | |
bf6419e4 | 692 | fput(file); |
7c184ecd CH |
693 | } |
694 | #endif /* CONFIG_BLK_DEV_RAM */ | |
695 | ||
e7cb072e | 696 | static void __init do_populate_rootfs(void *unused, async_cookie_t cookie) |
1da177e4 | 697 | { |
17a9be31 | 698 | /* Load the built in initramfs */ |
ffe8018c | 699 | char *err = unpack_to_rootfs(__initramfs_start, __initramfs_size); |
1da177e4 | 700 | if (err) |
dd23e809 | 701 | panic_show_mem("%s", err); /* Failed to decompress INTERNAL initramfs */ |
afef7889 CH |
702 | |
703 | if (!initrd_start || IS_ENABLED(CONFIG_INITRAMFS_FORCE)) | |
704 | goto done; | |
705 | ||
706 | if (IS_ENABLED(CONFIG_BLK_DEV_RAM)) | |
a1e6b6c1 | 707 | printk(KERN_INFO "Trying to unpack rootfs image as initramfs...\n"); |
afef7889 CH |
708 | else |
709 | printk(KERN_INFO "Unpacking initramfs...\n"); | |
54c7a891 | 710 | |
afef7889 CH |
711 | err = unpack_to_rootfs((char *)initrd_start, initrd_end - initrd_start); |
712 | if (err) { | |
9ab6b718 | 713 | #ifdef CONFIG_BLK_DEV_RAM |
7c184ecd | 714 | populate_initrd_image(err); |
9ab6b718 CH |
715 | #else |
716 | printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err); | |
717 | #endif | |
1da177e4 | 718 | } |
23091e28 | 719 | |
afef7889 | 720 | done: |
23091e28 CH |
721 | /* |
722 | * If the initrd region is overlapped with crashkernel reserved region, | |
723 | * free only memory that is not part of crashkernel region. | |
724 | */ | |
5d59aa8f | 725 | if (!do_retain_initrd && initrd_start && !kexec_free_initrd()) |
23091e28 CH |
726 | free_initrd_mem(initrd_start, initrd_end); |
727 | initrd_start = 0; | |
728 | initrd_end = 0; | |
729 | ||
17a9be31 | 730 | flush_delayed_fput(); |
68d85f0a | 731 | task_work_run(); |
e7cb072e RV |
732 | } |
733 | ||
734 | static ASYNC_DOMAIN_EXCLUSIVE(initramfs_domain); | |
735 | static async_cookie_t initramfs_cookie; | |
736 | ||
737 | void wait_for_initramfs(void) | |
738 | { | |
739 | if (!initramfs_cookie) { | |
740 | /* | |
741 | * Something before rootfs_initcall wants to access | |
742 | * the filesystem/initramfs. Probably a bug. Make a | |
743 | * note, avoid deadlocking the machine, and let the | |
744 | * caller's access fail as it used to. | |
745 | */ | |
746 | pr_warn_once("wait_for_initramfs() called before rootfs_initcalls\n"); | |
747 | return; | |
748 | } | |
749 | async_synchronize_cookie_domain(initramfs_cookie + 1, &initramfs_domain); | |
750 | } | |
751 | EXPORT_SYMBOL_GPL(wait_for_initramfs); | |
752 | ||
753 | static int __init populate_rootfs(void) | |
754 | { | |
755 | initramfs_cookie = async_schedule_domain(do_populate_rootfs, NULL, | |
756 | &initramfs_domain); | |
b234ed6d | 757 | usermodehelper_enable(); |
e7cb072e RV |
758 | if (!initramfs_async) |
759 | wait_for_initramfs(); | |
8d610dd5 | 760 | return 0; |
1da177e4 | 761 | } |
8d610dd5 | 762 | rootfs_initcall(populate_rootfs); |