Root/
1 | /* |
2 | * Many of the syscalls used in this file expect some of the arguments |
3 | * to be __user pointers not __kernel pointers. To limit the sparse |
4 | * noise, turn off sparse checking for this file. |
5 | */ |
6 | #ifdef __CHECKER__ |
7 | #undef __CHECKER__ |
8 | #warning "Sparse checking disabled for this file" |
9 | #endif |
10 | |
11 | #include <linux/init.h> |
12 | #include <linux/fs.h> |
13 | #include <linux/slab.h> |
14 | #include <linux/types.h> |
15 | #include <linux/fcntl.h> |
16 | #include <linux/delay.h> |
17 | #include <linux/string.h> |
18 | #include <linux/dirent.h> |
19 | #include <linux/syscalls.h> |
20 | #include <linux/utime.h> |
21 | |
22 | static __initdata char *message; |
23 | static void __init error(char *x) |
24 | { |
25 | if (!message) |
26 | message = x; |
27 | } |
28 | |
29 | /* link hash */ |
30 | |
31 | #define N_ALIGN(len) ((((len) + 1) & ~3) + 2) |
32 | |
33 | static __initdata struct hash { |
34 | int ino, minor, major; |
35 | umode_t mode; |
36 | struct hash *next; |
37 | char name[N_ALIGN(PATH_MAX)]; |
38 | } *head[32]; |
39 | |
40 | static inline int hash(int major, int minor, int ino) |
41 | { |
42 | unsigned long tmp = ino + minor + (major << 3); |
43 | tmp += tmp >> 5; |
44 | return tmp & 31; |
45 | } |
46 | |
47 | static char __init *find_link(int major, int minor, int ino, |
48 | umode_t mode, char *name) |
49 | { |
50 | struct hash **p, *q; |
51 | for (p = head + hash(major, minor, ino); *p; p = &(*p)->next) { |
52 | if ((*p)->ino != ino) |
53 | continue; |
54 | if ((*p)->minor != minor) |
55 | continue; |
56 | if ((*p)->major != major) |
57 | continue; |
58 | if (((*p)->mode ^ mode) & S_IFMT) |
59 | continue; |
60 | return (*p)->name; |
61 | } |
62 | q = kmalloc(sizeof(struct hash), GFP_KERNEL); |
63 | if (!q) |
64 | panic("can't allocate link hash entry"); |
65 | q->major = major; |
66 | q->minor = minor; |
67 | q->ino = ino; |
68 | q->mode = mode; |
69 | strcpy(q->name, name); |
70 | q->next = NULL; |
71 | *p = q; |
72 | return NULL; |
73 | } |
74 | |
75 | static void __init free_hash(void) |
76 | { |
77 | struct hash **p, *q; |
78 | for (p = head; p < head + 32; p++) { |
79 | while (*p) { |
80 | q = *p; |
81 | *p = q->next; |
82 | kfree(q); |
83 | } |
84 | } |
85 | } |
86 | |
87 | static long __init do_utime(char *filename, time_t mtime) |
88 | { |
89 | struct timespec t[2]; |
90 | |
91 | t[0].tv_sec = mtime; |
92 | t[0].tv_nsec = 0; |
93 | t[1].tv_sec = mtime; |
94 | t[1].tv_nsec = 0; |
95 | |
96 | return do_utimes(AT_FDCWD, filename, t, AT_SYMLINK_NOFOLLOW); |
97 | } |
98 | |
99 | static __initdata LIST_HEAD(dir_list); |
100 | struct dir_entry { |
101 | struct list_head list; |
102 | char *name; |
103 | time_t mtime; |
104 | }; |
105 | |
106 | static void __init dir_add(const char *name, time_t mtime) |
107 | { |
108 | struct dir_entry *de = kmalloc(sizeof(struct dir_entry), GFP_KERNEL); |
109 | if (!de) |
110 | panic("can't allocate dir_entry buffer"); |
111 | INIT_LIST_HEAD(&de->list); |
112 | de->name = kstrdup(name, GFP_KERNEL); |
113 | de->mtime = mtime; |
114 | list_add(&de->list, &dir_list); |
115 | } |
116 | |
117 | static void __init dir_utime(void) |
118 | { |
119 | struct dir_entry *de, *tmp; |
120 | list_for_each_entry_safe(de, tmp, &dir_list, list) { |
121 | list_del(&de->list); |
122 | do_utime(de->name, de->mtime); |
123 | kfree(de->name); |
124 | kfree(de); |
125 | } |
126 | } |
127 | |
128 | static __initdata time_t mtime; |
129 | |
130 | /* cpio header parsing */ |
131 | |
132 | static __initdata unsigned long ino, major, minor, nlink; |
133 | static __initdata umode_t mode; |
134 | static __initdata unsigned long body_len, name_len; |
135 | static __initdata uid_t uid; |
136 | static __initdata gid_t gid; |
137 | static __initdata unsigned rdev; |
138 | |
139 | static void __init parse_header(char *s) |
140 | { |
141 | unsigned long parsed[12]; |
142 | char buf[9]; |
143 | int i; |
144 | |
145 | buf[8] = '\0'; |
146 | for (i = 0, s += 6; i < 12; i++, s += 8) { |
147 | memcpy(buf, s, 8); |
148 | parsed[i] = simple_strtoul(buf, NULL, 16); |
149 | } |
150 | ino = parsed[0]; |
151 | mode = parsed[1]; |
152 | uid = parsed[2]; |
153 | gid = parsed[3]; |
154 | nlink = parsed[4]; |
155 | mtime = parsed[5]; |
156 | body_len = parsed[6]; |
157 | major = parsed[7]; |
158 | minor = parsed[8]; |
159 | rdev = new_encode_dev(MKDEV(parsed[9], parsed[10])); |
160 | name_len = parsed[11]; |
161 | } |
162 | |
163 | /* FSM */ |
164 | |
165 | static __initdata enum state { |
166 | Start, |
167 | Collect, |
168 | GotHeader, |
169 | SkipIt, |
170 | GotName, |
171 | CopyFile, |
172 | GotSymlink, |
173 | Reset |
174 | } state, next_state; |
175 | |
176 | static __initdata char *victim; |
177 | static __initdata unsigned count; |
178 | static __initdata loff_t this_header, next_header; |
179 | |
180 | static inline void __init eat(unsigned n) |
181 | { |
182 | victim += n; |
183 | this_header += n; |
184 | count -= n; |
185 | } |
186 | |
187 | static __initdata char *vcollected; |
188 | static __initdata char *collected; |
189 | static __initdata int remains; |
190 | static __initdata char *collect; |
191 | |
192 | static void __init read_into(char *buf, unsigned size, enum state next) |
193 | { |
194 | if (count >= size) { |
195 | collected = victim; |
196 | eat(size); |
197 | state = next; |
198 | } else { |
199 | collect = collected = buf; |
200 | remains = size; |
201 | next_state = next; |
202 | state = Collect; |
203 | } |
204 | } |
205 | |
206 | static __initdata char *header_buf, *symlink_buf, *name_buf; |
207 | |
208 | static int __init do_start(void) |
209 | { |
210 | read_into(header_buf, 110, GotHeader); |
211 | return 0; |
212 | } |
213 | |
214 | static int __init do_collect(void) |
215 | { |
216 | unsigned n = remains; |
217 | if (count < n) |
218 | n = count; |
219 | memcpy(collect, victim, n); |
220 | eat(n); |
221 | collect += n; |
222 | if ((remains -= n) != 0) |
223 | return 1; |
224 | state = next_state; |
225 | return 0; |
226 | } |
227 | |
228 | static int __init do_header(void) |
229 | { |
230 | if (memcmp(collected, "070707", 6)==0) { |
231 | error("incorrect cpio method used: use -H newc option"); |
232 | return 1; |
233 | } |
234 | if (memcmp(collected, "070701", 6)) { |
235 | error("no cpio magic"); |
236 | return 1; |
237 | } |
238 | parse_header(collected); |
239 | next_header = this_header + N_ALIGN(name_len) + body_len; |
240 | next_header = (next_header + 3) & ~3; |
241 | state = SkipIt; |
242 | if (name_len <= 0 || name_len > PATH_MAX) |
243 | return 0; |
244 | if (S_ISLNK(mode)) { |
245 | if (body_len > PATH_MAX) |
246 | return 0; |
247 | collect = collected = symlink_buf; |
248 | remains = N_ALIGN(name_len) + body_len; |
249 | next_state = GotSymlink; |
250 | state = Collect; |
251 | return 0; |
252 | } |
253 | if (S_ISREG(mode) || !body_len) |
254 | read_into(name_buf, N_ALIGN(name_len), GotName); |
255 | return 0; |
256 | } |
257 | |
258 | static int __init do_skip(void) |
259 | { |
260 | if (this_header + count < next_header) { |
261 | eat(count); |
262 | return 1; |
263 | } else { |
264 | eat(next_header - this_header); |
265 | state = next_state; |
266 | return 0; |
267 | } |
268 | } |
269 | |
270 | static int __init do_reset(void) |
271 | { |
272 | while(count && *victim == '\0') |
273 | eat(1); |
274 | if (count && (this_header & 3)) |
275 | error("broken padding"); |
276 | return 1; |
277 | } |
278 | |
279 | static int __init maybe_link(void) |
280 | { |
281 | if (nlink >= 2) { |
282 | char *old = find_link(major, minor, ino, mode, collected); |
283 | if (old) |
284 | return (sys_link(old, collected) < 0) ? -1 : 1; |
285 | } |
286 | return 0; |
287 | } |
288 | |
289 | static void __init clean_path(char *path, umode_t mode) |
290 | { |
291 | struct stat st; |
292 | |
293 | if (!sys_newlstat(path, &st) && (st.st_mode^mode) & S_IFMT) { |
294 | if (S_ISDIR(st.st_mode)) |
295 | sys_rmdir(path); |
296 | else |
297 | sys_unlink(path); |
298 | } |
299 | } |
300 | |
301 | static __initdata int wfd; |
302 | |
303 | static int __init do_name(void) |
304 | { |
305 | state = SkipIt; |
306 | next_state = Reset; |
307 | if (strcmp(collected, "TRAILER!!!") == 0) { |
308 | free_hash(); |
309 | return 0; |
310 | } |
311 | clean_path(collected, mode); |
312 | if (S_ISREG(mode)) { |
313 | int ml = maybe_link(); |
314 | if (ml >= 0) { |
315 | int openflags = O_WRONLY|O_CREAT; |
316 | if (ml != 1) |
317 | openflags |= O_TRUNC; |
318 | wfd = sys_open(collected, openflags, mode); |
319 | |
320 | if (wfd >= 0) { |
321 | sys_fchown(wfd, uid, gid); |
322 | sys_fchmod(wfd, mode); |
323 | if (body_len) |
324 | sys_ftruncate(wfd, body_len); |
325 | vcollected = kstrdup(collected, GFP_KERNEL); |
326 | state = CopyFile; |
327 | } |
328 | } |
329 | } else if (S_ISDIR(mode)) { |
330 | sys_mkdir(collected, mode); |
331 | sys_chown(collected, uid, gid); |
332 | sys_chmod(collected, mode); |
333 | dir_add(collected, mtime); |
334 | } else if (S_ISBLK(mode) || S_ISCHR(mode) || |
335 | S_ISFIFO(mode) || S_ISSOCK(mode)) { |
336 | if (maybe_link() == 0) { |
337 | sys_mknod(collected, mode, rdev); |
338 | sys_chown(collected, uid, gid); |
339 | sys_chmod(collected, mode); |
340 | do_utime(collected, mtime); |
341 | } |
342 | } |
343 | return 0; |
344 | } |
345 | |
346 | static int __init do_copy(void) |
347 | { |
348 | if (count >= body_len) { |
349 | sys_write(wfd, victim, body_len); |
350 | sys_close(wfd); |
351 | do_utime(vcollected, mtime); |
352 | kfree(vcollected); |
353 | eat(body_len); |
354 | state = SkipIt; |
355 | return 0; |
356 | } else { |
357 | sys_write(wfd, victim, count); |
358 | body_len -= count; |
359 | eat(count); |
360 | return 1; |
361 | } |
362 | } |
363 | |
364 | static int __init do_symlink(void) |
365 | { |
366 | collected[N_ALIGN(name_len) + body_len] = '\0'; |
367 | clean_path(collected, 0); |
368 | sys_symlink(collected + N_ALIGN(name_len), collected); |
369 | sys_lchown(collected, uid, gid); |
370 | do_utime(collected, mtime); |
371 | state = SkipIt; |
372 | next_state = Reset; |
373 | return 0; |
374 | } |
375 | |
376 | static __initdata int (*actions[])(void) = { |
377 | [Start] = do_start, |
378 | [Collect] = do_collect, |
379 | [GotHeader] = do_header, |
380 | [SkipIt] = do_skip, |
381 | [GotName] = do_name, |
382 | [CopyFile] = do_copy, |
383 | [GotSymlink] = do_symlink, |
384 | [Reset] = do_reset, |
385 | }; |
386 | |
387 | static int __init write_buffer(char *buf, unsigned len) |
388 | { |
389 | count = len; |
390 | victim = buf; |
391 | |
392 | while (!actions[state]()) |
393 | ; |
394 | return len - count; |
395 | } |
396 | |
397 | static int __init flush_buffer(void *bufv, unsigned len) |
398 | { |
399 | char *buf = (char *) bufv; |
400 | int written; |
401 | int origLen = len; |
402 | if (message) |
403 | return -1; |
404 | while ((written = write_buffer(buf, len)) < len && !message) { |
405 | char c = buf[written]; |
406 | if (c == '0') { |
407 | buf += written; |
408 | len -= written; |
409 | state = Start; |
410 | } else if (c == 0) { |
411 | buf += written; |
412 | len -= written; |
413 | state = Reset; |
414 | } else |
415 | error("junk in compressed archive"); |
416 | } |
417 | return origLen; |
418 | } |
419 | |
420 | static unsigned my_inptr; /* index of next byte to be processed in inbuf */ |
421 | |
422 | #include <linux/decompress/generic.h> |
423 | |
424 | static char * __init unpack_to_rootfs(char *buf, unsigned len) |
425 | { |
426 | int written, res; |
427 | decompress_fn decompress; |
428 | const char *compress_name; |
429 | static __initdata char msg_buf[64]; |
430 | |
431 | header_buf = kmalloc(110, GFP_KERNEL); |
432 | symlink_buf = kmalloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1, GFP_KERNEL); |
433 | name_buf = kmalloc(N_ALIGN(PATH_MAX), GFP_KERNEL); |
434 | |
435 | if (!header_buf || !symlink_buf || !name_buf) |
436 | panic("can't allocate buffers"); |
437 | |
438 | state = Start; |
439 | this_header = 0; |
440 | message = NULL; |
441 | while (!message && len) { |
442 | loff_t saved_offset = this_header; |
443 | if (*buf == '0' && !(this_header & 3)) { |
444 | state = Start; |
445 | written = write_buffer(buf, len); |
446 | buf += written; |
447 | len -= written; |
448 | continue; |
449 | } |
450 | if (!*buf) { |
451 | buf++; |
452 | len--; |
453 | this_header++; |
454 | continue; |
455 | } |
456 | this_header = 0; |
457 | decompress = decompress_method(buf, len, &compress_name); |
458 | if (decompress) { |
459 | res = decompress(buf, len, NULL, flush_buffer, NULL, |
460 | &my_inptr, error); |
461 | if (res) |
462 | error("decompressor failed"); |
463 | } else if (compress_name) { |
464 | if (!message) { |
465 | snprintf(msg_buf, sizeof msg_buf, |
466 | "compression method %s not configured", |
467 | compress_name); |
468 | message = msg_buf; |
469 | } |
470 | } else |
471 | error("junk in compressed archive"); |
472 | if (state != Reset) |
473 | error("junk in compressed archive"); |
474 | this_header = saved_offset + my_inptr; |
475 | buf += my_inptr; |
476 | len -= my_inptr; |
477 | } |
478 | dir_utime(); |
479 | kfree(name_buf); |
480 | kfree(symlink_buf); |
481 | kfree(header_buf); |
482 | return message; |
483 | } |
484 | |
485 | static int __initdata do_retain_initrd; |
486 | |
487 | static int __init retain_initrd_param(char *str) |
488 | { |
489 | if (*str) |
490 | return 0; |
491 | do_retain_initrd = 1; |
492 | return 1; |
493 | } |
494 | __setup("retain_initrd", retain_initrd_param); |
495 | |
496 | extern char __initramfs_start[]; |
497 | extern unsigned long __initramfs_size; |
498 | #include <linux/initrd.h> |
499 | #include <linux/kexec.h> |
500 | |
501 | static void __init free_initrd(void) |
502 | { |
503 | #ifdef CONFIG_KEXEC |
504 | unsigned long crashk_start = (unsigned long)__va(crashk_res.start); |
505 | unsigned long crashk_end = (unsigned long)__va(crashk_res.end); |
506 | #endif |
507 | if (do_retain_initrd) |
508 | goto skip; |
509 | |
510 | #ifdef CONFIG_KEXEC |
511 | /* |
512 | * If the initrd region is overlapped with crashkernel reserved region, |
513 | * free only memory that is not part of crashkernel region. |
514 | */ |
515 | if (initrd_start < crashk_end && initrd_end > crashk_start) { |
516 | /* |
517 | * Initialize initrd memory region since the kexec boot does |
518 | * not do. |
519 | */ |
520 | memset((void *)initrd_start, 0, initrd_end - initrd_start); |
521 | if (initrd_start < crashk_start) |
522 | free_initrd_mem(initrd_start, crashk_start); |
523 | if (initrd_end > crashk_end) |
524 | free_initrd_mem(crashk_end, initrd_end); |
525 | } else |
526 | #endif |
527 | free_initrd_mem(initrd_start, initrd_end); |
528 | skip: |
529 | initrd_start = 0; |
530 | initrd_end = 0; |
531 | } |
532 | |
533 | #ifdef CONFIG_BLK_DEV_RAM |
534 | #define BUF_SIZE 1024 |
535 | static void __init clean_rootfs(void) |
536 | { |
537 | int fd; |
538 | void *buf; |
539 | struct linux_dirent64 *dirp; |
540 | int num; |
541 | |
542 | fd = sys_open("/", O_RDONLY, 0); |
543 | WARN_ON(fd < 0); |
544 | if (fd < 0) |
545 | return; |
546 | buf = kzalloc(BUF_SIZE, GFP_KERNEL); |
547 | WARN_ON(!buf); |
548 | if (!buf) { |
549 | sys_close(fd); |
550 | return; |
551 | } |
552 | |
553 | dirp = buf; |
554 | num = sys_getdents64(fd, dirp, BUF_SIZE); |
555 | while (num > 0) { |
556 | while (num > 0) { |
557 | struct stat st; |
558 | int ret; |
559 | |
560 | ret = sys_newlstat(dirp->d_name, &st); |
561 | WARN_ON_ONCE(ret); |
562 | if (!ret) { |
563 | if (S_ISDIR(st.st_mode)) |
564 | sys_rmdir(dirp->d_name); |
565 | else |
566 | sys_unlink(dirp->d_name); |
567 | } |
568 | |
569 | num -= dirp->d_reclen; |
570 | dirp = (void *)dirp + dirp->d_reclen; |
571 | } |
572 | dirp = buf; |
573 | memset(buf, 0, BUF_SIZE); |
574 | num = sys_getdents64(fd, dirp, BUF_SIZE); |
575 | } |
576 | |
577 | sys_close(fd); |
578 | kfree(buf); |
579 | } |
580 | #endif |
581 | |
582 | static int __init populate_rootfs(void) |
583 | { |
584 | char *err = unpack_to_rootfs(__initramfs_start, __initramfs_size); |
585 | if (err) |
586 | panic(err); /* Failed to decompress INTERNAL initramfs */ |
587 | if (initrd_start) { |
588 | #ifdef CONFIG_BLK_DEV_RAM |
589 | int fd; |
590 | printk(KERN_INFO "Trying to unpack rootfs image as initramfs...\n"); |
591 | err = unpack_to_rootfs((char *)initrd_start, |
592 | initrd_end - initrd_start); |
593 | if (!err) { |
594 | free_initrd(); |
595 | goto done; |
596 | } else { |
597 | clean_rootfs(); |
598 | unpack_to_rootfs(__initramfs_start, __initramfs_size); |
599 | } |
600 | printk(KERN_INFO "rootfs image is not initramfs (%s)" |
601 | "; looks like an initrd\n", err); |
602 | fd = sys_open("/initrd.image", |
603 | O_WRONLY|O_CREAT, 0700); |
604 | if (fd >= 0) { |
605 | sys_write(fd, (char *)initrd_start, |
606 | initrd_end - initrd_start); |
607 | sys_close(fd); |
608 | free_initrd(); |
609 | } |
610 | done: |
611 | #else |
612 | printk(KERN_INFO "Unpacking initramfs...\n"); |
613 | err = unpack_to_rootfs((char *)initrd_start, |
614 | initrd_end - initrd_start); |
615 | if (err) |
616 | printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err); |
617 | free_initrd(); |
618 | #endif |
619 | /* |
620 | * Try loading default modules from initramfs. This gives |
621 | * us a chance to load before device_initcalls. |
622 | */ |
623 | load_default_modules(); |
624 | } |
625 | return 0; |
626 | } |
627 | rootfs_initcall(populate_rootfs); |
628 |
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