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>
22 static ssize_t __init xwrite(int fd, const char *p, size_t count)
26 /* sys_write only can write MAX_RW_COUNT aka 2G-4K bytes at most */
28 ssize_t rv = sys_write(fd, p, count);
31 if (rv == -EINTR || rv == -EAGAIN)
33 return out ? out : rv;
45 static __initdata char *message;
46 static void __init error(char *x)
54 #define N_ALIGN(len) ((((len) + 1) & ~3) + 2)
56 static __initdata struct hash {
57 int ino, minor, major;
60 char name[N_ALIGN(PATH_MAX)];
63 static inline int hash(int major, int minor, int ino)
65 unsigned long tmp = ino + minor + (major << 3);
70 static char __init *find_link(int major, int minor, int ino,
71 umode_t mode, char *name)
74 for (p = head + hash(major, minor, ino); *p; p = &(*p)->next) {
77 if ((*p)->minor != minor)
79 if ((*p)->major != major)
81 if (((*p)->mode ^ mode) & S_IFMT)
85 q = kmalloc(sizeof(struct hash), GFP_KERNEL);
87 panic("can't allocate link hash entry");
92 strcpy(q->name, name);
98 static void __init free_hash(void)
101 for (p = head; p < head + 32; p++) {
110 static long __init do_utime(char *filename, time_t mtime)
112 struct timespec t[2];
119 return do_utimes(AT_FDCWD, filename, t, AT_SYMLINK_NOFOLLOW);
122 static __initdata LIST_HEAD(dir_list);
124 struct list_head list;
129 static void __init dir_add(const char *name, time_t mtime)
131 struct dir_entry *de = kmalloc(sizeof(struct dir_entry), GFP_KERNEL);
133 panic("can't allocate dir_entry buffer");
134 INIT_LIST_HEAD(&de->list);
135 de->name = kstrdup(name, GFP_KERNEL);
137 list_add(&de->list, &dir_list);
140 static void __init dir_utime(void)
142 struct dir_entry *de, *tmp;
143 list_for_each_entry_safe(de, tmp, &dir_list, list) {
145 do_utime(de->name, de->mtime);
151 static __initdata time_t mtime;
153 /* cpio header parsing */
155 static __initdata unsigned long ino, major, minor, nlink;
156 static __initdata umode_t mode;
157 static __initdata unsigned long body_len, name_len;
158 static __initdata uid_t uid;
159 static __initdata gid_t gid;
160 static __initdata unsigned rdev;
162 static void __init parse_header(char *s)
164 unsigned long parsed[12];
169 for (i = 0, s += 6; i < 12; i++, s += 8) {
171 parsed[i] = simple_strtoul(buf, NULL, 16);
179 body_len = parsed[6];
182 rdev = new_encode_dev(MKDEV(parsed[9], parsed[10]));
183 name_len = parsed[11];
188 static __initdata enum state {
199 static __initdata char *victim;
200 static unsigned long byte_count __initdata;
201 static __initdata loff_t this_header, next_header;
203 static inline void __init eat(unsigned n)
210 static __initdata char *vcollected;
211 static __initdata char *collected;
212 static long remains __initdata;
213 static __initdata char *collect;
215 static void __init read_into(char *buf, unsigned size, enum state next)
217 if (byte_count >= size) {
222 collect = collected = buf;
229 static __initdata char *header_buf, *symlink_buf, *name_buf;
231 static int __init do_start(void)
233 read_into(header_buf, 110, GotHeader);
237 static int __init do_collect(void)
239 unsigned long n = remains;
242 memcpy(collect, victim, n);
245 if ((remains -= n) != 0)
251 static int __init do_header(void)
253 if (memcmp(collected, "070707", 6)==0) {
254 error("incorrect cpio method used: use -H newc option");
257 if (memcmp(collected, "070701", 6)) {
258 error("no cpio magic");
261 parse_header(collected);
262 next_header = this_header + N_ALIGN(name_len) + body_len;
263 next_header = (next_header + 3) & ~3;
265 if (name_len <= 0 || name_len > PATH_MAX)
268 if (body_len > PATH_MAX)
270 collect = collected = symlink_buf;
271 remains = N_ALIGN(name_len) + body_len;
272 next_state = GotSymlink;
276 if (S_ISREG(mode) || !body_len)
277 read_into(name_buf, N_ALIGN(name_len), GotName);
281 static int __init do_skip(void)
283 if (this_header + byte_count < next_header) {
287 eat(next_header - this_header);
293 static int __init do_reset(void)
295 while (byte_count && *victim == '\0')
297 if (byte_count && (this_header & 3))
298 error("broken padding");
302 static int __init maybe_link(void)
305 char *old = find_link(major, minor, ino, mode, collected);
307 return (sys_link(old, collected) < 0) ? -1 : 1;
312 static void __init clean_path(char *path, umode_t fmode)
316 if (!sys_newlstat(path, &st) && (st.st_mode ^ fmode) & S_IFMT) {
317 if (S_ISDIR(st.st_mode))
324 static __initdata int wfd;
326 static int __init do_name(void)
330 if (strcmp(collected, "TRAILER!!!") == 0) {
334 clean_path(collected, mode);
336 int ml = maybe_link();
338 int openflags = O_WRONLY|O_CREAT;
340 openflags |= O_TRUNC;
341 wfd = sys_open(collected, openflags, mode);
344 sys_fchown(wfd, uid, gid);
345 sys_fchmod(wfd, mode);
347 sys_ftruncate(wfd, body_len);
348 vcollected = kstrdup(collected, GFP_KERNEL);
352 } else if (S_ISDIR(mode)) {
353 sys_mkdir(collected, mode);
354 sys_chown(collected, uid, gid);
355 sys_chmod(collected, mode);
356 dir_add(collected, mtime);
357 } else if (S_ISBLK(mode) || S_ISCHR(mode) ||
358 S_ISFIFO(mode) || S_ISSOCK(mode)) {
359 if (maybe_link() == 0) {
360 sys_mknod(collected, mode, rdev);
361 sys_chown(collected, uid, gid);
362 sys_chmod(collected, mode);
363 do_utime(collected, mtime);
369 static int __init do_copy(void)
371 if (byte_count >= body_len) {
372 if (xwrite(wfd, victim, body_len) != body_len)
373 error("write error");
375 do_utime(vcollected, mtime);
381 if (xwrite(wfd, victim, byte_count) != byte_count)
382 error("write error");
383 body_len -= byte_count;
389 static int __init do_symlink(void)
391 collected[N_ALIGN(name_len) + body_len] = '\0';
392 clean_path(collected, 0);
393 sys_symlink(collected + N_ALIGN(name_len), collected);
394 sys_lchown(collected, uid, gid);
395 do_utime(collected, mtime);
401 static __initdata int (*actions[])(void) = {
403 [Collect] = do_collect,
404 [GotHeader] = do_header,
407 [CopyFile] = do_copy,
408 [GotSymlink] = do_symlink,
412 static long __init write_buffer(char *buf, unsigned long len)
417 while (!actions[state]())
419 return len - byte_count;
422 static long __init flush_buffer(void *bufv, unsigned long len)
424 char *buf = (char *) bufv;
429 while ((written = write_buffer(buf, len)) < len && !message) {
430 char c = buf[written];
440 error("junk in compressed archive");
445 static unsigned long my_inptr; /* index of next byte to be processed in inbuf */
447 #include <linux/decompress/generic.h>
449 static char * __init unpack_to_rootfs(char *buf, unsigned long len)
452 decompress_fn decompress;
453 const char *compress_name;
454 static __initdata char msg_buf[64];
456 header_buf = kmalloc(110, GFP_KERNEL);
457 symlink_buf = kmalloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1, GFP_KERNEL);
458 name_buf = kmalloc(N_ALIGN(PATH_MAX), GFP_KERNEL);
460 if (!header_buf || !symlink_buf || !name_buf)
461 panic("can't allocate buffers");
466 while (!message && len) {
467 loff_t saved_offset = this_header;
468 if (*buf == '0' && !(this_header & 3)) {
470 written = write_buffer(buf, len);
482 decompress = decompress_method(buf, len, &compress_name);
483 pr_debug("Detected %s compressed data\n", compress_name);
485 int res = decompress(buf, len, NULL, flush_buffer, NULL,
488 error("decompressor failed");
489 } else if (compress_name) {
491 snprintf(msg_buf, sizeof msg_buf,
492 "compression method %s not configured",
497 error("junk in compressed archive");
499 error("junk in compressed archive");
500 this_header = saved_offset + my_inptr;
511 static int __initdata do_retain_initrd;
513 static int __init retain_initrd_param(char *str)
517 do_retain_initrd = 1;
520 __setup("retain_initrd", retain_initrd_param);
522 extern char __initramfs_start[];
523 extern unsigned long __initramfs_size;
524 #include <linux/initrd.h>
525 #include <linux/kexec.h>
527 static void __init free_initrd(void)
529 #ifdef CONFIG_KEXEC_CORE
530 unsigned long crashk_start = (unsigned long)__va(crashk_res.start);
531 unsigned long crashk_end = (unsigned long)__va(crashk_res.end);
533 if (do_retain_initrd)
536 #ifdef CONFIG_KEXEC_CORE
538 * If the initrd region is overlapped with crashkernel reserved region,
539 * free only memory that is not part of crashkernel region.
541 if (initrd_start < crashk_end && initrd_end > crashk_start) {
543 * Initialize initrd memory region since the kexec boot does
546 memset((void *)initrd_start, 0, initrd_end - initrd_start);
547 if (initrd_start < crashk_start)
548 free_initrd_mem(initrd_start, crashk_start);
549 if (initrd_end > crashk_end)
550 free_initrd_mem(crashk_end, initrd_end);
553 free_initrd_mem(initrd_start, initrd_end);
559 #ifdef CONFIG_BLK_DEV_RAM
560 #define BUF_SIZE 1024
561 static void __init clean_rootfs(void)
565 struct linux_dirent64 *dirp;
568 fd = sys_open("/", O_RDONLY, 0);
572 buf = kzalloc(BUF_SIZE, GFP_KERNEL);
580 num = sys_getdents64(fd, dirp, BUF_SIZE);
586 ret = sys_newlstat(dirp->d_name, &st);
589 if (S_ISDIR(st.st_mode))
590 sys_rmdir(dirp->d_name);
592 sys_unlink(dirp->d_name);
595 num -= dirp->d_reclen;
596 dirp = (void *)dirp + dirp->d_reclen;
599 memset(buf, 0, BUF_SIZE);
600 num = sys_getdents64(fd, dirp, BUF_SIZE);
608 static int __init populate_rootfs(void)
610 char *err = unpack_to_rootfs(__initramfs_start, __initramfs_size);
612 panic("%s", err); /* Failed to decompress INTERNAL initramfs */
614 #ifdef CONFIG_BLK_DEV_RAM
616 printk(KERN_INFO "Trying to unpack rootfs image as initramfs...\n");
617 err = unpack_to_rootfs((char *)initrd_start,
618 initrd_end - initrd_start);
624 unpack_to_rootfs(__initramfs_start, __initramfs_size);
626 printk(KERN_INFO "rootfs image is not initramfs (%s)"
627 "; looks like an initrd\n", err);
628 fd = sys_open("/initrd.image",
629 O_WRONLY|O_CREAT, 0700);
631 ssize_t written = xwrite(fd, (char *)initrd_start,
632 initrd_end - initrd_start);
634 if (written != initrd_end - initrd_start)
635 pr_err("/initrd.image: incomplete write (%zd != %ld)\n",
636 written, initrd_end - initrd_start);
643 printk(KERN_INFO "Unpacking initramfs...\n");
644 err = unpack_to_rootfs((char *)initrd_start,
645 initrd_end - initrd_start);
647 printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err);
651 * Try loading default modules from initramfs. This gives
652 * us a chance to load before device_initcalls.
654 load_default_modules();
658 rootfs_initcall(populate_rootfs);