| 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 | return 0; |
| 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 | #else |
| 611 | printk(KERN_INFO "Unpacking initramfs...\n"); |
| 612 | err = unpack_to_rootfs((char *)initrd_start, |
| 613 | initrd_end - initrd_start); |
| 614 | if (err) |
| 615 | printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err); |
| 616 | free_initrd(); |
| 617 | #endif |
| 618 | } |
| 619 | return 0; |
| 620 | } |
| 621 | rootfs_initcall(populate_rootfs); |