Commit | Line | Data |
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1da177e4 LT |
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/syscalls.h> | |
9 | ||
10 | static __initdata char *message; | |
11 | static void __init error(char *x) | |
12 | { | |
13 | if (!message) | |
14 | message = x; | |
15 | } | |
16 | ||
17 | static void __init *malloc(size_t size) | |
18 | { | |
19 | return kmalloc(size, GFP_KERNEL); | |
20 | } | |
21 | ||
22 | static void __init free(void *where) | |
23 | { | |
24 | kfree(where); | |
25 | } | |
26 | ||
27 | /* link hash */ | |
28 | ||
29 | static __initdata struct hash { | |
30 | int ino, minor, major; | |
31 | struct hash *next; | |
32 | char *name; | |
33 | } *head[32]; | |
34 | ||
35 | static inline int hash(int major, int minor, int ino) | |
36 | { | |
37 | unsigned long tmp = ino + minor + (major << 3); | |
38 | tmp += tmp >> 5; | |
39 | return tmp & 31; | |
40 | } | |
41 | ||
42 | static char __init *find_link(int major, int minor, int ino, char *name) | |
43 | { | |
44 | struct hash **p, *q; | |
45 | for (p = head + hash(major, minor, ino); *p; p = &(*p)->next) { | |
46 | if ((*p)->ino != ino) | |
47 | continue; | |
48 | if ((*p)->minor != minor) | |
49 | continue; | |
50 | if ((*p)->major != major) | |
51 | continue; | |
52 | return (*p)->name; | |
53 | } | |
54 | q = (struct hash *)malloc(sizeof(struct hash)); | |
55 | if (!q) | |
56 | panic("can't allocate link hash entry"); | |
57 | q->ino = ino; | |
58 | q->minor = minor; | |
59 | q->major = major; | |
60 | q->name = name; | |
61 | q->next = NULL; | |
62 | *p = q; | |
63 | return NULL; | |
64 | } | |
65 | ||
66 | static void __init free_hash(void) | |
67 | { | |
68 | struct hash **p, *q; | |
69 | for (p = head; p < head + 32; p++) { | |
70 | while (*p) { | |
71 | q = *p; | |
72 | *p = q->next; | |
73 | free(q); | |
74 | } | |
75 | } | |
76 | } | |
77 | ||
78 | /* cpio header parsing */ | |
79 | ||
80 | static __initdata unsigned long ino, major, minor, nlink; | |
81 | static __initdata mode_t mode; | |
82 | static __initdata unsigned long body_len, name_len; | |
83 | static __initdata uid_t uid; | |
84 | static __initdata gid_t gid; | |
85 | static __initdata unsigned rdev; | |
86 | ||
87 | static void __init parse_header(char *s) | |
88 | { | |
89 | unsigned long parsed[12]; | |
90 | char buf[9]; | |
91 | int i; | |
92 | ||
93 | buf[8] = '\0'; | |
94 | for (i = 0, s += 6; i < 12; i++, s += 8) { | |
95 | memcpy(buf, s, 8); | |
96 | parsed[i] = simple_strtoul(buf, NULL, 16); | |
97 | } | |
98 | ino = parsed[0]; | |
99 | mode = parsed[1]; | |
100 | uid = parsed[2]; | |
101 | gid = parsed[3]; | |
102 | nlink = parsed[4]; | |
103 | body_len = parsed[6]; | |
104 | major = parsed[7]; | |
105 | minor = parsed[8]; | |
106 | rdev = new_encode_dev(MKDEV(parsed[9], parsed[10])); | |
107 | name_len = parsed[11]; | |
108 | } | |
109 | ||
110 | /* FSM */ | |
111 | ||
112 | static __initdata enum state { | |
113 | Start, | |
114 | Collect, | |
115 | GotHeader, | |
116 | SkipIt, | |
117 | GotName, | |
118 | CopyFile, | |
119 | GotSymlink, | |
120 | Reset | |
121 | } state, next_state; | |
122 | ||
123 | static __initdata char *victim; | |
124 | static __initdata unsigned count; | |
125 | static __initdata loff_t this_header, next_header; | |
126 | ||
127 | static __initdata int dry_run; | |
128 | ||
129 | static inline void eat(unsigned n) | |
130 | { | |
131 | victim += n; | |
132 | this_header += n; | |
133 | count -= n; | |
134 | } | |
135 | ||
136 | #define N_ALIGN(len) ((((len) + 1) & ~3) + 2) | |
137 | ||
138 | static __initdata char *collected; | |
139 | static __initdata int remains; | |
140 | static __initdata char *collect; | |
141 | ||
142 | static void __init read_into(char *buf, unsigned size, enum state next) | |
143 | { | |
144 | if (count >= size) { | |
145 | collected = victim; | |
146 | eat(size); | |
147 | state = next; | |
148 | } else { | |
149 | collect = collected = buf; | |
150 | remains = size; | |
151 | next_state = next; | |
152 | state = Collect; | |
153 | } | |
154 | } | |
155 | ||
156 | static __initdata char *header_buf, *symlink_buf, *name_buf; | |
157 | ||
158 | static int __init do_start(void) | |
159 | { | |
160 | read_into(header_buf, 110, GotHeader); | |
161 | return 0; | |
162 | } | |
163 | ||
164 | static int __init do_collect(void) | |
165 | { | |
166 | unsigned n = remains; | |
167 | if (count < n) | |
168 | n = count; | |
169 | memcpy(collect, victim, n); | |
170 | eat(n); | |
171 | collect += n; | |
172 | if ((remains -= n) != 0) | |
173 | return 1; | |
174 | state = next_state; | |
175 | return 0; | |
176 | } | |
177 | ||
178 | static int __init do_header(void) | |
179 | { | |
180 | if (memcmp(collected, "070701", 6)) { | |
181 | error("no cpio magic"); | |
182 | return 1; | |
183 | } | |
184 | parse_header(collected); | |
185 | next_header = this_header + N_ALIGN(name_len) + body_len; | |
186 | next_header = (next_header + 3) & ~3; | |
187 | if (dry_run) { | |
188 | read_into(name_buf, N_ALIGN(name_len), GotName); | |
189 | return 0; | |
190 | } | |
191 | state = SkipIt; | |
192 | if (name_len <= 0 || name_len > PATH_MAX) | |
193 | return 0; | |
194 | if (S_ISLNK(mode)) { | |
195 | if (body_len > PATH_MAX) | |
196 | return 0; | |
197 | collect = collected = symlink_buf; | |
198 | remains = N_ALIGN(name_len) + body_len; | |
199 | next_state = GotSymlink; | |
200 | state = Collect; | |
201 | return 0; | |
202 | } | |
203 | if (S_ISREG(mode) || !body_len) | |
204 | read_into(name_buf, N_ALIGN(name_len), GotName); | |
205 | return 0; | |
206 | } | |
207 | ||
208 | static int __init do_skip(void) | |
209 | { | |
210 | if (this_header + count < next_header) { | |
211 | eat(count); | |
212 | return 1; | |
213 | } else { | |
214 | eat(next_header - this_header); | |
215 | state = next_state; | |
216 | return 0; | |
217 | } | |
218 | } | |
219 | ||
220 | static int __init do_reset(void) | |
221 | { | |
222 | while(count && *victim == '\0') | |
223 | eat(1); | |
224 | if (count && (this_header & 3)) | |
225 | error("broken padding"); | |
226 | return 1; | |
227 | } | |
228 | ||
229 | static int __init maybe_link(void) | |
230 | { | |
231 | if (nlink >= 2) { | |
232 | char *old = find_link(major, minor, ino, collected); | |
233 | if (old) | |
234 | return (sys_link(old, collected) < 0) ? -1 : 1; | |
235 | } | |
236 | return 0; | |
237 | } | |
238 | ||
239 | static __initdata int wfd; | |
240 | ||
241 | static int __init do_name(void) | |
242 | { | |
243 | state = SkipIt; | |
244 | next_state = Reset; | |
245 | if (strcmp(collected, "TRAILER!!!") == 0) { | |
246 | free_hash(); | |
247 | return 0; | |
248 | } | |
249 | if (dry_run) | |
250 | return 0; | |
251 | if (S_ISREG(mode)) { | |
252 | if (maybe_link() >= 0) { | |
253 | wfd = sys_open(collected, O_WRONLY|O_CREAT, mode); | |
254 | if (wfd >= 0) { | |
255 | sys_fchown(wfd, uid, gid); | |
256 | sys_fchmod(wfd, mode); | |
257 | state = CopyFile; | |
258 | } | |
259 | } | |
260 | } else if (S_ISDIR(mode)) { | |
261 | sys_mkdir(collected, mode); | |
262 | sys_chown(collected, uid, gid); | |
263 | sys_chmod(collected, mode); | |
264 | } else if (S_ISBLK(mode) || S_ISCHR(mode) || | |
265 | S_ISFIFO(mode) || S_ISSOCK(mode)) { | |
266 | if (maybe_link() == 0) { | |
267 | sys_mknod(collected, mode, rdev); | |
268 | sys_chown(collected, uid, gid); | |
269 | sys_chmod(collected, mode); | |
270 | } | |
271 | } | |
272 | return 0; | |
273 | } | |
274 | ||
275 | static int __init do_copy(void) | |
276 | { | |
277 | if (count >= body_len) { | |
278 | sys_write(wfd, victim, body_len); | |
279 | sys_close(wfd); | |
280 | eat(body_len); | |
281 | state = SkipIt; | |
282 | return 0; | |
283 | } else { | |
284 | sys_write(wfd, victim, count); | |
285 | body_len -= count; | |
286 | eat(count); | |
287 | return 1; | |
288 | } | |
289 | } | |
290 | ||
291 | static int __init do_symlink(void) | |
292 | { | |
293 | collected[N_ALIGN(name_len) + body_len] = '\0'; | |
294 | sys_symlink(collected + N_ALIGN(name_len), collected); | |
295 | sys_lchown(collected, uid, gid); | |
296 | state = SkipIt; | |
297 | next_state = Reset; | |
298 | return 0; | |
299 | } | |
300 | ||
301 | static __initdata int (*actions[])(void) = { | |
302 | [Start] = do_start, | |
303 | [Collect] = do_collect, | |
304 | [GotHeader] = do_header, | |
305 | [SkipIt] = do_skip, | |
306 | [GotName] = do_name, | |
307 | [CopyFile] = do_copy, | |
308 | [GotSymlink] = do_symlink, | |
309 | [Reset] = do_reset, | |
310 | }; | |
311 | ||
312 | static int __init write_buffer(char *buf, unsigned len) | |
313 | { | |
314 | count = len; | |
315 | victim = buf; | |
316 | ||
317 | while (!actions[state]()) | |
318 | ; | |
319 | return len - count; | |
320 | } | |
321 | ||
322 | static void __init flush_buffer(char *buf, unsigned len) | |
323 | { | |
324 | int written; | |
325 | if (message) | |
326 | return; | |
327 | while ((written = write_buffer(buf, len)) < len && !message) { | |
328 | char c = buf[written]; | |
329 | if (c == '0') { | |
330 | buf += written; | |
331 | len -= written; | |
332 | state = Start; | |
333 | } else if (c == 0) { | |
334 | buf += written; | |
335 | len -= written; | |
336 | state = Reset; | |
337 | } else | |
338 | error("junk in compressed archive"); | |
339 | } | |
340 | } | |
341 | ||
342 | /* | |
343 | * gzip declarations | |
344 | */ | |
345 | ||
346 | #define OF(args) args | |
347 | ||
348 | #ifndef memzero | |
349 | #define memzero(s, n) memset ((s), 0, (n)) | |
350 | #endif | |
351 | ||
352 | typedef unsigned char uch; | |
353 | typedef unsigned short ush; | |
354 | typedef unsigned long ulg; | |
355 | ||
356 | #define WSIZE 0x8000 /* window size--must be a power of two, and */ | |
357 | /* at least 32K for zip's deflate method */ | |
358 | ||
359 | static uch *inbuf; | |
360 | static uch *window; | |
361 | ||
362 | static unsigned insize; /* valid bytes in inbuf */ | |
363 | static unsigned inptr; /* index of next byte to be processed in inbuf */ | |
364 | static unsigned outcnt; /* bytes in output buffer */ | |
365 | static long bytes_out; | |
366 | ||
367 | #define get_byte() (inptr < insize ? inbuf[inptr++] : -1) | |
368 | ||
369 | /* Diagnostic functions (stubbed out) */ | |
370 | #define Assert(cond,msg) | |
371 | #define Trace(x) | |
372 | #define Tracev(x) | |
373 | #define Tracevv(x) | |
374 | #define Tracec(c,x) | |
375 | #define Tracecv(c,x) | |
376 | ||
377 | #define STATIC static | |
378 | #define INIT __init | |
379 | ||
380 | static void __init flush_window(void); | |
381 | static void __init error(char *m); | |
382 | static void __init gzip_mark(void **); | |
383 | static void __init gzip_release(void **); | |
384 | ||
385 | #include "../lib/inflate.c" | |
386 | ||
387 | static void __init gzip_mark(void **ptr) | |
388 | { | |
389 | } | |
390 | ||
391 | static void __init gzip_release(void **ptr) | |
392 | { | |
393 | } | |
394 | ||
395 | /* =========================================================================== | |
396 | * Write the output window window[0..outcnt-1] and update crc and bytes_out. | |
397 | * (Used for the decompressed data only.) | |
398 | */ | |
399 | static void __init flush_window(void) | |
400 | { | |
401 | ulg c = crc; /* temporary variable */ | |
402 | unsigned n; | |
403 | uch *in, ch; | |
404 | ||
405 | flush_buffer(window, outcnt); | |
406 | in = window; | |
407 | for (n = 0; n < outcnt; n++) { | |
408 | ch = *in++; | |
409 | c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8); | |
410 | } | |
411 | crc = c; | |
412 | bytes_out += (ulg)outcnt; | |
413 | outcnt = 0; | |
414 | } | |
415 | ||
416 | static char * __init unpack_to_rootfs(char *buf, unsigned len, int check_only) | |
417 | { | |
418 | int written; | |
419 | dry_run = check_only; | |
420 | header_buf = malloc(110); | |
421 | symlink_buf = malloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1); | |
422 | name_buf = malloc(N_ALIGN(PATH_MAX)); | |
423 | window = malloc(WSIZE); | |
424 | if (!window || !header_buf || !symlink_buf || !name_buf) | |
425 | panic("can't allocate buffers"); | |
426 | state = Start; | |
427 | this_header = 0; | |
428 | message = NULL; | |
429 | while (!message && len) { | |
430 | loff_t saved_offset = this_header; | |
431 | if (*buf == '0' && !(this_header & 3)) { | |
432 | state = Start; | |
433 | written = write_buffer(buf, len); | |
434 | buf += written; | |
435 | len -= written; | |
436 | continue; | |
437 | } | |
438 | if (!*buf) { | |
439 | buf++; | |
440 | len--; | |
441 | this_header++; | |
442 | continue; | |
443 | } | |
444 | this_header = 0; | |
445 | insize = len; | |
446 | inbuf = buf; | |
447 | inptr = 0; | |
448 | outcnt = 0; /* bytes in output buffer */ | |
449 | bytes_out = 0; | |
450 | crc = (ulg)0xffffffffL; /* shift register contents */ | |
451 | makecrc(); | |
452 | gunzip(); | |
453 | if (state != Reset) | |
454 | error("junk in gzipped archive"); | |
455 | this_header = saved_offset + inptr; | |
456 | buf += inptr; | |
457 | len -= inptr; | |
458 | } | |
459 | free(window); | |
460 | free(name_buf); | |
461 | free(symlink_buf); | |
462 | free(header_buf); | |
463 | return message; | |
464 | } | |
465 | ||
466 | extern char __initramfs_start[], __initramfs_end[]; | |
467 | #ifdef CONFIG_BLK_DEV_INITRD | |
468 | #include <linux/initrd.h> | |
0f3d2bd5 JB |
469 | |
470 | static void __init free_initrd(void) | |
471 | { | |
472 | free_initrd_mem(initrd_start, initrd_end); | |
473 | initrd_start = 0; | |
474 | initrd_end = 0; | |
475 | } | |
476 | ||
1da177e4 LT |
477 | #endif |
478 | ||
479 | void __init populate_rootfs(void) | |
480 | { | |
481 | char *err = unpack_to_rootfs(__initramfs_start, | |
482 | __initramfs_end - __initramfs_start, 0); | |
483 | if (err) | |
484 | panic(err); | |
485 | #ifdef CONFIG_BLK_DEV_INITRD | |
486 | if (initrd_start) { | |
487 | int fd; | |
488 | printk(KERN_INFO "checking if image is initramfs..."); | |
489 | err = unpack_to_rootfs((char *)initrd_start, | |
490 | initrd_end - initrd_start, 1); | |
491 | if (!err) { | |
492 | printk(" it is\n"); | |
493 | unpack_to_rootfs((char *)initrd_start, | |
494 | initrd_end - initrd_start, 0); | |
0f3d2bd5 | 495 | free_initrd(); |
1da177e4 LT |
496 | return; |
497 | } | |
498 | printk("it isn't (%s); looks like an initrd\n", err); | |
499 | fd = sys_open("/initrd.image", O_WRONLY|O_CREAT, 700); | |
500 | if (fd >= 0) { | |
501 | sys_write(fd, (char *)initrd_start, | |
502 | initrd_end - initrd_start); | |
503 | sys_close(fd); | |
0f3d2bd5 | 504 | free_initrd(); |
1da177e4 LT |
505 | } |
506 | } | |
507 | #endif | |
508 | } |