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.
8 #warning "Sparse checking disabled for this file"
11 #include <linux/init.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 #include <linux/initramfs.h>
23 static ssize_t __init xwrite(int fd, const char *p, size_t count)
27 /* sys_write only can write MAX_RW_COUNT aka 2G-4K bytes at most */
29 ssize_t rv = sys_write(fd, p, count);
32 if (rv == -EINTR || rv == -EAGAIN)
34 return out ? out : rv;
46 static __initdata char *message;
47 static void __init error(char *x)
55 #define N_ALIGN(len) ((((len) + 1) & ~3) + 2)
57 static __initdata struct hash {
58 int ino, minor, major;
61 char name[N_ALIGN(PATH_MAX)];
64 static inline int hash(int major, int minor, int ino)
66 unsigned long tmp = ino + minor + (major << 3);
71 static char __init *find_link(int major, int minor, int ino,
72 umode_t mode, char *name)
75 for (p = head + hash(major, minor, ino); *p; p = &(*p)->next) {
78 if ((*p)->minor != minor)
80 if ((*p)->major != major)
82 if (((*p)->mode ^ mode) & S_IFMT)
86 q = kmalloc(sizeof(struct hash), GFP_KERNEL);
88 panic("can't allocate link hash entry");
93 strcpy(q->name, name);
99 static void __init free_hash(void)
102 for (p = head; p < head + 32; p++) {
111 static long __init do_utime(char *filename, time_t mtime)
113 struct timespec t[2];
120 return do_utimes(AT_FDCWD, filename, t, AT_SYMLINK_NOFOLLOW);
123 static __initdata LIST_HEAD(dir_list);
125 struct list_head list;
130 static void __init dir_add(const char *name, time_t mtime)
132 struct dir_entry *de = kmalloc(sizeof(struct dir_entry), GFP_KERNEL);
134 panic("can't allocate dir_entry buffer");
135 INIT_LIST_HEAD(&de->list);
136 de->name = kstrdup(name, GFP_KERNEL);
138 list_add(&de->list, &dir_list);
141 static void __init dir_utime(void)
143 struct dir_entry *de, *tmp;
144 list_for_each_entry_safe(de, tmp, &dir_list, list) {
146 do_utime(de->name, de->mtime);
152 static __initdata time_t mtime;
154 /* cpio header parsing */
156 static __initdata unsigned long ino, major, minor, nlink;
157 static __initdata umode_t mode;
158 static __initdata unsigned long body_len, name_len;
159 static __initdata uid_t uid;
160 static __initdata gid_t gid;
161 static __initdata unsigned rdev;
163 static void __init parse_header(char *s)
165 unsigned long parsed[12];
170 for (i = 0, s += 6; i < 12; i++, s += 8) {
172 parsed[i] = simple_strtoul(buf, NULL, 16);
180 body_len = parsed[6];
183 rdev = new_encode_dev(MKDEV(parsed[9], parsed[10]));
184 name_len = parsed[11];
189 static __initdata enum state {
200 static __initdata char *victim;
201 static unsigned long byte_count __initdata;
202 static __initdata loff_t this_header, next_header;
204 static inline void __init eat(unsigned n)
211 static __initdata char *vcollected;
212 static __initdata char *collected;
213 static long remains __initdata;
214 static __initdata char *collect;
216 static void __init read_into(char *buf, unsigned size, enum state next)
218 if (byte_count >= size) {
223 collect = collected = buf;
230 static __initdata char *header_buf, *symlink_buf, *name_buf;
232 static int __init do_start(void)
234 read_into(header_buf, 110, GotHeader);
238 static int __init do_collect(void)
240 unsigned long n = remains;
243 memcpy(collect, victim, n);
246 if ((remains -= n) != 0)
252 static int __init do_header(void)
254 if (memcmp(collected, "070707", 6)==0) {
255 error("incorrect cpio method used: use -H newc option");
258 if (memcmp(collected, "070701", 6)) {
259 error("no cpio magic");
262 parse_header(collected);
263 next_header = this_header + N_ALIGN(name_len) + body_len;
264 next_header = (next_header + 3) & ~3;
266 if (name_len <= 0 || name_len > PATH_MAX)
269 if (body_len > PATH_MAX)
271 collect = collected = symlink_buf;
272 remains = N_ALIGN(name_len) + body_len;
273 next_state = GotSymlink;
277 if (S_ISREG(mode) || !body_len)
278 read_into(name_buf, N_ALIGN(name_len), GotName);
282 static int __init do_skip(void)
284 if (this_header + byte_count < next_header) {
288 eat(next_header - this_header);
294 static int __init do_reset(void)
296 while (byte_count && *victim == '\0')
298 if (byte_count && (this_header & 3))
299 error("broken padding");
303 static int __init maybe_link(void)
306 char *old = find_link(major, minor, ino, mode, collected);
308 return (sys_link(old, collected) < 0) ? -1 : 1;
313 static void __init clean_path(char *path, umode_t fmode)
317 if (!sys_newlstat(path, &st) && (st.st_mode ^ fmode) & S_IFMT) {
318 if (S_ISDIR(st.st_mode))
325 static __initdata int wfd;
327 static int __init do_name(void)
331 if (strcmp(collected, "TRAILER!!!") == 0) {
335 clean_path(collected, mode);
337 int ml = maybe_link();
339 int openflags = O_WRONLY|O_CREAT;
341 openflags |= O_TRUNC;
342 wfd = sys_open(collected, openflags, mode);
345 sys_fchown(wfd, uid, gid);
346 sys_fchmod(wfd, mode);
348 sys_ftruncate(wfd, body_len);
349 vcollected = kstrdup(collected, GFP_KERNEL);
353 } else if (S_ISDIR(mode)) {
354 sys_mkdir(collected, mode);
355 sys_chown(collected, uid, gid);
356 sys_chmod(collected, mode);
357 dir_add(collected, mtime);
358 } else if (S_ISBLK(mode) || S_ISCHR(mode) ||
359 S_ISFIFO(mode) || S_ISSOCK(mode)) {
360 if (maybe_link() == 0) {
361 sys_mknod(collected, mode, rdev);
362 sys_chown(collected, uid, gid);
363 sys_chmod(collected, mode);
364 do_utime(collected, mtime);
370 static int __init do_copy(void)
372 if (byte_count >= body_len) {
373 if (xwrite(wfd, victim, body_len) != body_len)
374 error("write error");
376 do_utime(vcollected, mtime);
382 if (xwrite(wfd, victim, byte_count) != byte_count)
383 error("write error");
384 body_len -= byte_count;
390 static int __init do_symlink(void)
392 collected[N_ALIGN(name_len) + body_len] = '\0';
393 clean_path(collected, 0);
394 sys_symlink(collected + N_ALIGN(name_len), collected);
395 sys_lchown(collected, uid, gid);
396 do_utime(collected, mtime);
402 static __initdata int (*actions[])(void) = {
404 [Collect] = do_collect,
405 [GotHeader] = do_header,
408 [CopyFile] = do_copy,
409 [GotSymlink] = do_symlink,
413 static long __init write_buffer(char *buf, unsigned long len)
418 while (!actions[state]())
420 return len - byte_count;
423 static long __init flush_buffer(void *bufv, unsigned long len)
425 char *buf = (char *) bufv;
430 while ((written = write_buffer(buf, len)) < len && !message) {
431 char c = buf[written];
441 error("junk in compressed archive");
446 static unsigned long my_inptr; /* index of next byte to be processed in inbuf */
448 #include <linux/decompress/generic.h>
450 static char * __init unpack_to_rootfs(char *buf, unsigned long len)
453 decompress_fn decompress;
454 const char *compress_name;
455 static __initdata char msg_buf[64];
457 header_buf = kmalloc(110, GFP_KERNEL);
458 symlink_buf = kmalloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1, GFP_KERNEL);
459 name_buf = kmalloc(N_ALIGN(PATH_MAX), GFP_KERNEL);
461 if (!header_buf || !symlink_buf || !name_buf)
462 panic("can't allocate buffers");
467 while (!message && len) {
468 loff_t saved_offset = this_header;
469 if (*buf == '0' && !(this_header & 3)) {
471 written = write_buffer(buf, len);
483 decompress = decompress_method(buf, len, &compress_name);
484 pr_debug("Detected %s compressed data\n", compress_name);
486 int res = decompress(buf, len, NULL, flush_buffer, NULL,
489 error("decompressor failed");
490 } else if (compress_name) {
492 snprintf(msg_buf, sizeof msg_buf,
493 "compression method %s not configured",
498 error("junk in compressed archive");
500 error("junk in compressed archive");
501 this_header = saved_offset + my_inptr;
512 static int __initdata do_retain_initrd;
514 static int __init retain_initrd_param(char *str)
518 do_retain_initrd = 1;
521 __setup("retain_initrd", retain_initrd_param);
523 extern char __initramfs_start[];
524 extern unsigned long __initramfs_size;
525 #include <linux/initrd.h>
526 #include <linux/kexec.h>
528 static void __init free_initrd(void)
530 #ifdef CONFIG_KEXEC_CORE
531 unsigned long crashk_start = (unsigned long)__va(crashk_res.start);
532 unsigned long crashk_end = (unsigned long)__va(crashk_res.end);
534 if (do_retain_initrd)
537 #ifdef CONFIG_KEXEC_CORE
539 * If the initrd region is overlapped with crashkernel reserved region,
540 * free only memory that is not part of crashkernel region.
542 if (initrd_start < crashk_end && initrd_end > crashk_start) {
544 * Initialize initrd memory region since the kexec boot does
547 memset((void *)initrd_start, 0, initrd_end - initrd_start);
548 if (initrd_start < crashk_start)
549 free_initrd_mem(initrd_start, crashk_start);
550 if (initrd_end > crashk_end)
551 free_initrd_mem(crashk_end, initrd_end);
554 free_initrd_mem(initrd_start, initrd_end);
560 #ifdef CONFIG_BLK_DEV_RAM
561 #define BUF_SIZE 1024
562 static void __init clean_rootfs(void)
566 struct linux_dirent64 *dirp;
569 fd = sys_open("/", O_RDONLY, 0);
573 buf = kzalloc(BUF_SIZE, GFP_KERNEL);
581 num = sys_getdents64(fd, dirp, BUF_SIZE);
587 ret = sys_newlstat(dirp->d_name, &st);
590 if (S_ISDIR(st.st_mode))
591 sys_rmdir(dirp->d_name);
593 sys_unlink(dirp->d_name);
596 num -= dirp->d_reclen;
597 dirp = (void *)dirp + dirp->d_reclen;
600 memset(buf, 0, BUF_SIZE);
601 num = sys_getdents64(fd, dirp, BUF_SIZE);
609 static int __initdata do_skip_initramfs;
611 static int __init skip_initramfs_param(char *str)
615 do_skip_initramfs = 1;
618 __setup("skip_initramfs", skip_initramfs_param);
620 static int __init populate_rootfs(void)
624 if (do_skip_initramfs)
625 return default_rootfs();
627 err = unpack_to_rootfs(__initramfs_start, __initramfs_size);
629 panic("%s", err); /* Failed to decompress INTERNAL initramfs */
631 #ifdef CONFIG_BLK_DEV_RAM
633 printk(KERN_INFO "Trying to unpack rootfs image as initramfs...\n");
634 err = unpack_to_rootfs((char *)initrd_start,
635 initrd_end - initrd_start);
641 unpack_to_rootfs(__initramfs_start, __initramfs_size);
643 printk(KERN_INFO "rootfs image is not initramfs (%s)"
644 "; looks like an initrd\n", err);
645 fd = sys_open("/initrd.image",
646 O_WRONLY|O_CREAT, 0700);
648 ssize_t written = xwrite(fd, (char *)initrd_start,
649 initrd_end - initrd_start);
651 if (written != initrd_end - initrd_start)
652 pr_err("/initrd.image: incomplete write (%zd != %ld)\n",
653 written, initrd_end - initrd_start);
660 printk(KERN_INFO "Unpacking initramfs...\n");
661 err = unpack_to_rootfs((char *)initrd_start,
662 initrd_end - initrd_start);
664 printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err);
668 * Try loading default modules from initramfs. This gives
669 * us a chance to load before device_initcalls.
671 load_default_modules();
675 rootfs_initcall(populate_rootfs);