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 sys_ftruncate(wfd, body_len); 314 vcollected = kstrdup(collected, GFP_KERNEL); 315 state = CopyFile; 316 } 317 } 318 } else if (S_ISDIR(mode)) { 319 sys_mkdir(collected, mode); 320 sys_chown(collected, uid, gid); 321 sys_chmod(collected, mode); 322 dir_add(collected, mtime); 323 } else if (S_ISBLK(mode) || S_ISCHR(mode) || 324 S_ISFIFO(mode) || S_ISSOCK(mode)) { 325 if (maybe_link() == 0) { 326 sys_mknod(collected, mode, rdev); 327 sys_chown(collected, uid, gid); 328 sys_chmod(collected, mode); 329 do_utime(collected, mtime); 330 } 331 } 332 return 0; 333 } 334 335 static int __init do_copy(void) 336 { 337 if (count >= body_len) { 338 sys_write(wfd, victim, body_len); 339 sys_close(wfd); 340 do_utime(vcollected, mtime); 341 kfree(vcollected); 342 eat(body_len); 343 state = SkipIt; 344 return 0; 345 } else { 346 sys_write(wfd, victim, count); 347 body_len -= count; 348 eat(count); 349 return 1; 350 } 351 } 352 353 static int __init do_symlink(void) 354 { 355 collected[N_ALIGN(name_len) + body_len] = '\0'; 356 clean_path(collected, 0); 357 sys_symlink(collected + N_ALIGN(name_len), collected); 358 sys_lchown(collected, uid, gid); 359 do_utime(collected, mtime); 360 state = SkipIt; 361 next_state = Reset; 362 return 0; 363 } 364 365 static __initdata int (*actions[])(void) = { 366 [Start] = do_start, 367 [Collect] = do_collect, 368 [GotHeader] = do_header, 369 [SkipIt] = do_skip, 370 [GotName] = do_name, 371 [CopyFile] = do_copy, 372 [GotSymlink] = do_symlink, 373 [Reset] = do_reset, 374 }; 375 376 static int __init write_buffer(char *buf, unsigned len) 377 { 378 count = len; 379 victim = buf; 380 381 while (!actions[state]()) 382 ; 383 return len - count; 384 } 385 386 static int __init flush_buffer(void *bufv, unsigned len) 387 { 388 char *buf = (char *) bufv; 389 int written; 390 int origLen = len; 391 if (message) 392 return -1; 393 while ((written = write_buffer(buf, len)) < len && !message) { 394 char c = buf[written]; 395 if (c == '0') { 396 buf += written; 397 len -= written; 398 state = Start; 399 } else if (c == 0) { 400 buf += written; 401 len -= written; 402 state = Reset; 403 } else 404 error("junk in compressed archive"); 405 } 406 return origLen; 407 } 408 409 static unsigned my_inptr; /* index of next byte to be processed in inbuf */ 410 411 #include <linux/decompress/generic.h> 412 413 static char * __init unpack_to_rootfs(char *buf, unsigned len) 414 { 415 int written; 416 decompress_fn decompress; 417 const char *compress_name; 418 static __initdata char msg_buf[64]; 419 420 header_buf = kmalloc(110, GFP_KERNEL); 421 symlink_buf = kmalloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1, GFP_KERNEL); 422 name_buf = kmalloc(N_ALIGN(PATH_MAX), GFP_KERNEL); 423 424 if (!header_buf || !symlink_buf || !name_buf) 425 panic("can't allocate buffers"); 426 427 state = Start; 428 this_header = 0; 429 message = NULL; 430 while (!message && len) { 431 loff_t saved_offset = this_header; 432 if (*buf == '0' && !(this_header & 3)) { 433 state = Start; 434 written = write_buffer(buf, len); 435 buf += written; 436 len -= written; 437 continue; 438 } 439 if (!*buf) { 440 buf++; 441 len--; 442 this_header++; 443 continue; 444 } 445 this_header = 0; 446 decompress = decompress_method(buf, len, &compress_name); 447 if (decompress) 448 decompress(buf, len, NULL, flush_buffer, NULL, 449 &my_inptr, error); 450 else if (compress_name) { 451 if (!message) { 452 snprintf(msg_buf, sizeof msg_buf, 453 "compression method %s not configured", 454 compress_name); 455 message = msg_buf; 456 } 457 } 458 if (state != Reset) 459 error("junk in compressed archive"); 460 this_header = saved_offset + my_inptr; 461 buf += my_inptr; 462 len -= my_inptr; 463 } 464 dir_utime(); 465 kfree(name_buf); 466 kfree(symlink_buf); 467 kfree(header_buf); 468 return message; 469 } 470 471 static int __initdata do_retain_initrd; 472 473 static int __init retain_initrd_param(char *str) 474 { 475 if (*str) 476 return 0; 477 do_retain_initrd = 1; 478 return 1; 479 } 480 __setup("retain_initrd", retain_initrd_param); 481 482 extern char __initramfs_start[], __initramfs_end[]; 483 #include <linux/initrd.h> 484 #include <linux/kexec.h> 485 486 static void __init free_initrd(void) 487 { 488 #ifdef CONFIG_KEXEC 489 unsigned long crashk_start = (unsigned long)__va(crashk_res.start); 490 unsigned long crashk_end = (unsigned long)__va(crashk_res.end); 491 #endif 492 if (do_retain_initrd) 493 goto skip; 494 495 #ifdef CONFIG_KEXEC 496 /* 497 * If the initrd region is overlapped with crashkernel reserved region, 498 * free only memory that is not part of crashkernel region. 499 */ 500 if (initrd_start < crashk_end && initrd_end > crashk_start) { 501 /* 502 * Initialize initrd memory region since the kexec boot does 503 * not do. 504 */ 505 memset((void *)initrd_start, 0, initrd_end - initrd_start); 506 if (initrd_start < crashk_start) 507 free_initrd_mem(initrd_start, crashk_start); 508 if (initrd_end > crashk_end) 509 free_initrd_mem(crashk_end, initrd_end); 510 } else 511 #endif 512 free_initrd_mem(initrd_start, initrd_end); 513 skip: 514 initrd_start = 0; 515 initrd_end = 0; 516 } 517 518 #define BUF_SIZE 1024 519 static void __init clean_rootfs(void) 520 { 521 int fd; 522 void *buf; 523 struct linux_dirent64 *dirp; 524 int count; 525 526 fd = sys_open("/", O_RDONLY, 0); 527 WARN_ON(fd < 0); 528 if (fd < 0) 529 return; 530 buf = kzalloc(BUF_SIZE, GFP_KERNEL); 531 WARN_ON(!buf); 532 if (!buf) { 533 sys_close(fd); 534 return; 535 } 536 537 dirp = buf; 538 count = sys_getdents64(fd, dirp, BUF_SIZE); 539 while (count > 0) { 540 while (count > 0) { 541 struct stat st; 542 int ret; 543 544 ret = sys_newlstat(dirp->d_name, &st); 545 WARN_ON_ONCE(ret); 546 if (!ret) { 547 if (S_ISDIR(st.st_mode)) 548 sys_rmdir(dirp->d_name); 549 else 550 sys_unlink(dirp->d_name); 551 } 552 553 count -= dirp->d_reclen; 554 dirp = (void *)dirp + dirp->d_reclen; 555 } 556 dirp = buf; 557 memset(buf, 0, BUF_SIZE); 558 count = sys_getdents64(fd, dirp, BUF_SIZE); 559 } 560 561 sys_close(fd); 562 kfree(buf); 563 } 564 565 static int __init populate_rootfs(void) 566 { 567 char *err = unpack_to_rootfs(__initramfs_start, 568 __initramfs_end - __initramfs_start); 569 if (err) 570 panic(err); /* Failed to decompress INTERNAL initramfs */ 571 if (initrd_start) { 572 #ifdef CONFIG_BLK_DEV_RAM 573 int fd; 574 printk(KERN_INFO "checking if image is initramfs..."); 575 err = unpack_to_rootfs((char *)initrd_start, 576 initrd_end - initrd_start); 577 if (!err) { 578 printk(" it is\n"); 579 free_initrd(); 580 return 0; 581 } else { 582 clean_rootfs(); 583 unpack_to_rootfs(__initramfs_start, 584 __initramfs_end - __initramfs_start); 585 } 586 printk("it isn't (%s); looks like an initrd\n", err); 587 fd = sys_open("/initrd.image", O_WRONLY|O_CREAT, 0700); 588 if (fd >= 0) { 589 sys_write(fd, (char *)initrd_start, 590 initrd_end - initrd_start); 591 sys_close(fd); 592 free_initrd(); 593 } 594 #else 595 printk(KERN_INFO "Unpacking initramfs..."); 596 err = unpack_to_rootfs((char *)initrd_start, 597 initrd_end - initrd_start); 598 if (err) { 599 printk(" failed!\n"); 600 printk(KERN_EMERG "%s\n", err); 601 } else { 602 printk(" done\n"); 603 } 604 free_initrd(); 605 #endif 606 } 607 return 0; 608 } 609 rootfs_initcall(populate_rootfs); 610