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