| /* |
| * Many of the syscalls used in this file expect some of the arguments |
| * to be __user pointers not __kernel pointers. To limit the sparse |
| * noise, turn off sparse checking for this file. |
| */ |
| #ifdef __CHECKER__ |
| #undef __CHECKER__ |
| #warning "Sparse checking disabled for this file" |
| #endif |
| |
| #include <linux/init.h> |
| #include <linux/fs.h> |
| #include <linux/slab.h> |
| #include <linux/types.h> |
| #include <linux/fcntl.h> |
| #include <linux/delay.h> |
| #include <linux/string.h> |
| #include <linux/dirent.h> |
| #include <linux/syscalls.h> |
| #include <linux/utime.h> |
| #include <linux/file.h> |
| |
| static ssize_t __init xwrite(int fd, const char *p, size_t count) |
| { |
| ssize_t out = 0; |
| |
| /* sys_write only can write MAX_RW_COUNT aka 2G-4K bytes at most */ |
| while (count) { |
| ssize_t rv = sys_write(fd, p, count); |
| |
| if (rv < 0) { |
| if (rv == -EINTR || rv == -EAGAIN) |
| continue; |
| return out ? out : rv; |
| } else if (rv == 0) |
| break; |
| |
| p += rv; |
| out += rv; |
| count -= rv; |
| } |
| |
| return out; |
| } |
| |
| static __initdata char *message; |
| static void __init error(char *x) |
| { |
| if (!message) |
| message = x; |
| } |
| |
| /* link hash */ |
| |
| #define N_ALIGN(len) ((((len) + 1) & ~3) + 2) |
| |
| static __initdata struct hash { |
| int ino, minor, major; |
| umode_t mode; |
| struct hash *next; |
| char name[N_ALIGN(PATH_MAX)]; |
| } *head[32]; |
| |
| static inline int hash(int major, int minor, int ino) |
| { |
| unsigned long tmp = ino + minor + (major << 3); |
| tmp += tmp >> 5; |
| return tmp & 31; |
| } |
| |
| static char __init *find_link(int major, int minor, int ino, |
| umode_t mode, char *name) |
| { |
| struct hash **p, *q; |
| for (p = head + hash(major, minor, ino); *p; p = &(*p)->next) { |
| if ((*p)->ino != ino) |
| continue; |
| if ((*p)->minor != minor) |
| continue; |
| if ((*p)->major != major) |
| continue; |
| if (((*p)->mode ^ mode) & S_IFMT) |
| continue; |
| return (*p)->name; |
| } |
| q = kmalloc(sizeof(struct hash), GFP_KERNEL); |
| if (!q) |
| panic("can't allocate link hash entry"); |
| q->major = major; |
| q->minor = minor; |
| q->ino = ino; |
| q->mode = mode; |
| strcpy(q->name, name); |
| q->next = NULL; |
| *p = q; |
| return NULL; |
| } |
| |
| static void __init free_hash(void) |
| { |
| struct hash **p, *q; |
| for (p = head; p < head + 32; p++) { |
| while (*p) { |
| q = *p; |
| *p = q->next; |
| kfree(q); |
| } |
| } |
| } |
| |
| static long __init do_utime(char *filename, time_t mtime) |
| { |
| struct timespec t[2]; |
| |
| t[0].tv_sec = mtime; |
| t[0].tv_nsec = 0; |
| t[1].tv_sec = mtime; |
| t[1].tv_nsec = 0; |
| |
| return do_utimes(AT_FDCWD, filename, t, AT_SYMLINK_NOFOLLOW); |
| } |
| |
| static __initdata LIST_HEAD(dir_list); |
| struct dir_entry { |
| struct list_head list; |
| char *name; |
| time_t mtime; |
| }; |
| |
| static void __init dir_add(const char *name, time_t mtime) |
| { |
| struct dir_entry *de = kmalloc(sizeof(struct dir_entry), GFP_KERNEL); |
| if (!de) |
| panic("can't allocate dir_entry buffer"); |
| INIT_LIST_HEAD(&de->list); |
| de->name = kstrdup(name, GFP_KERNEL); |
| de->mtime = mtime; |
| list_add(&de->list, &dir_list); |
| } |
| |
| static void __init dir_utime(void) |
| { |
| struct dir_entry *de, *tmp; |
| list_for_each_entry_safe(de, tmp, &dir_list, list) { |
| list_del(&de->list); |
| do_utime(de->name, de->mtime); |
| kfree(de->name); |
| kfree(de); |
| } |
| } |
| |
| static __initdata time_t mtime; |
| |
| /* cpio header parsing */ |
| |
| static __initdata unsigned long ino, major, minor, nlink; |
| static __initdata umode_t mode; |
| static __initdata unsigned long body_len, name_len; |
| static __initdata uid_t uid; |
| static __initdata gid_t gid; |
| static __initdata unsigned rdev; |
| |
| static void __init parse_header(char *s) |
| { |
| unsigned long parsed[12]; |
| char buf[9]; |
| int i; |
| |
| buf[8] = '\0'; |
| for (i = 0, s += 6; i < 12; i++, s += 8) { |
| memcpy(buf, s, 8); |
| parsed[i] = simple_strtoul(buf, NULL, 16); |
| } |
| ino = parsed[0]; |
| mode = parsed[1]; |
| uid = parsed[2]; |
| gid = parsed[3]; |
| nlink = parsed[4]; |
| mtime = parsed[5]; |
| body_len = parsed[6]; |
| major = parsed[7]; |
| minor = parsed[8]; |
| rdev = new_encode_dev(MKDEV(parsed[9], parsed[10])); |
| name_len = parsed[11]; |
| } |
| |
| /* FSM */ |
| |
| static __initdata enum state { |
| Start, |
| Collect, |
| GotHeader, |
| SkipIt, |
| GotName, |
| CopyFile, |
| GotSymlink, |
| Reset |
| } state, next_state; |
| |
| static __initdata char *victim; |
| static unsigned long byte_count __initdata; |
| static __initdata loff_t this_header, next_header; |
| |
| static inline void __init eat(unsigned n) |
| { |
| victim += n; |
| this_header += n; |
| byte_count -= n; |
| } |
| |
| static __initdata char *vcollected; |
| static __initdata char *collected; |
| static long remains __initdata; |
| static __initdata char *collect; |
| |
| static void __init read_into(char *buf, unsigned size, enum state next) |
| { |
| if (byte_count >= size) { |
| collected = victim; |
| eat(size); |
| state = next; |
| } else { |
| collect = collected = buf; |
| remains = size; |
| next_state = next; |
| state = Collect; |
| } |
| } |
| |
| static __initdata char *header_buf, *symlink_buf, *name_buf; |
| |
| static int __init do_start(void) |
| { |
| read_into(header_buf, 110, GotHeader); |
| return 0; |
| } |
| |
| static int __init do_collect(void) |
| { |
| unsigned long n = remains; |
| if (byte_count < n) |
| n = byte_count; |
| memcpy(collect, victim, n); |
| eat(n); |
| collect += n; |
| if ((remains -= n) != 0) |
| return 1; |
| state = next_state; |
| return 0; |
| } |
| |
| static int __init do_header(void) |
| { |
| if (memcmp(collected, "070707", 6)==0) { |
| error("incorrect cpio method used: use -H newc option"); |
| return 1; |
| } |
| if (memcmp(collected, "070701", 6)) { |
| error("no cpio magic"); |
| return 1; |
| } |
| parse_header(collected); |
| next_header = this_header + N_ALIGN(name_len) + body_len; |
| next_header = (next_header + 3) & ~3; |
| state = SkipIt; |
| if (name_len <= 0 || name_len > PATH_MAX) |
| return 0; |
| if (S_ISLNK(mode)) { |
| if (body_len > PATH_MAX) |
| return 0; |
| collect = collected = symlink_buf; |
| remains = N_ALIGN(name_len) + body_len; |
| next_state = GotSymlink; |
| state = Collect; |
| return 0; |
| } |
| if (S_ISREG(mode) || !body_len) |
| read_into(name_buf, N_ALIGN(name_len), GotName); |
| return 0; |
| } |
| |
| static int __init do_skip(void) |
| { |
| if (this_header + byte_count < next_header) { |
| eat(byte_count); |
| return 1; |
| } else { |
| eat(next_header - this_header); |
| state = next_state; |
| return 0; |
| } |
| } |
| |
| static int __init do_reset(void) |
| { |
| while (byte_count && *victim == '\0') |
| eat(1); |
| if (byte_count && (this_header & 3)) |
| error("broken padding"); |
| return 1; |
| } |
| |
| static int __init maybe_link(void) |
| { |
| if (nlink >= 2) { |
| char *old = find_link(major, minor, ino, mode, collected); |
| if (old) |
| return (sys_link(old, collected) < 0) ? -1 : 1; |
| } |
| return 0; |
| } |
| |
| static void __init clean_path(char *path, umode_t fmode) |
| { |
| struct stat st; |
| |
| if (!sys_newlstat(path, &st) && (st.st_mode ^ fmode) & S_IFMT) { |
| if (S_ISDIR(st.st_mode)) |
| sys_rmdir(path); |
| else |
| sys_unlink(path); |
| } |
| } |
| |
| static __initdata int wfd; |
| |
| static int __init do_name(void) |
| { |
| state = SkipIt; |
| next_state = Reset; |
| if (strcmp(collected, "TRAILER!!!") == 0) { |
| free_hash(); |
| return 0; |
| } |
| clean_path(collected, mode); |
| if (S_ISREG(mode)) { |
| int ml = maybe_link(); |
| if (ml >= 0) { |
| int openflags = O_WRONLY|O_CREAT; |
| if (ml != 1) |
| openflags |= O_TRUNC; |
| wfd = sys_open(collected, openflags, mode); |
| |
| if (wfd >= 0) { |
| sys_fchown(wfd, uid, gid); |
| sys_fchmod(wfd, mode); |
| if (body_len) |
| sys_ftruncate(wfd, body_len); |
| vcollected = kstrdup(collected, GFP_KERNEL); |
| state = CopyFile; |
| } |
| } |
| } else if (S_ISDIR(mode)) { |
| sys_mkdir(collected, mode); |
| sys_chown(collected, uid, gid); |
| sys_chmod(collected, mode); |
| dir_add(collected, mtime); |
| } else if (S_ISBLK(mode) || S_ISCHR(mode) || |
| S_ISFIFO(mode) || S_ISSOCK(mode)) { |
| if (maybe_link() == 0) { |
| sys_mknod(collected, mode, rdev); |
| sys_chown(collected, uid, gid); |
| sys_chmod(collected, mode); |
| do_utime(collected, mtime); |
| } |
| } |
| return 0; |
| } |
| |
| static int __init do_copy(void) |
| { |
| if (byte_count >= body_len) { |
| if (xwrite(wfd, victim, body_len) != body_len) |
| error("write error"); |
| sys_close(wfd); |
| do_utime(vcollected, mtime); |
| kfree(vcollected); |
| eat(body_len); |
| state = SkipIt; |
| return 0; |
| } else { |
| if (xwrite(wfd, victim, byte_count) != byte_count) |
| error("write error"); |
| body_len -= byte_count; |
| eat(byte_count); |
| return 1; |
| } |
| } |
| |
| static int __init do_symlink(void) |
| { |
| collected[N_ALIGN(name_len) + body_len] = '\0'; |
| clean_path(collected, 0); |
| sys_symlink(collected + N_ALIGN(name_len), collected); |
| sys_lchown(collected, uid, gid); |
| do_utime(collected, mtime); |
| state = SkipIt; |
| next_state = Reset; |
| return 0; |
| } |
| |
| static __initdata int (*actions[])(void) = { |
| [Start] = do_start, |
| [Collect] = do_collect, |
| [GotHeader] = do_header, |
| [SkipIt] = do_skip, |
| [GotName] = do_name, |
| [CopyFile] = do_copy, |
| [GotSymlink] = do_symlink, |
| [Reset] = do_reset, |
| }; |
| |
| static long __init write_buffer(char *buf, unsigned long len) |
| { |
| byte_count = len; |
| victim = buf; |
| |
| while (!actions[state]()) |
| ; |
| return len - byte_count; |
| } |
| |
| static long __init flush_buffer(void *bufv, unsigned long len) |
| { |
| char *buf = (char *) bufv; |
| long written; |
| long origLen = len; |
| if (message) |
| return -1; |
| while ((written = write_buffer(buf, len)) < len && !message) { |
| char c = buf[written]; |
| if (c == '0') { |
| buf += written; |
| len -= written; |
| state = Start; |
| } else if (c == 0) { |
| buf += written; |
| len -= written; |
| state = Reset; |
| } else |
| error("junk in compressed archive"); |
| } |
| return origLen; |
| } |
| |
| static unsigned long my_inptr; /* index of next byte to be processed in inbuf */ |
| |
| #include <linux/decompress/generic.h> |
| |
| static char * __init unpack_to_rootfs(char *buf, unsigned long len) |
| { |
| long written; |
| decompress_fn decompress; |
| const char *compress_name; |
| static __initdata char msg_buf[64]; |
| |
| header_buf = kmalloc(110, GFP_KERNEL); |
| symlink_buf = kmalloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1, GFP_KERNEL); |
| name_buf = kmalloc(N_ALIGN(PATH_MAX), GFP_KERNEL); |
| |
| if (!header_buf || !symlink_buf || !name_buf) |
| panic("can't allocate buffers"); |
| |
| state = Start; |
| this_header = 0; |
| message = NULL; |
| while (!message && len) { |
| loff_t saved_offset = this_header; |
| if (*buf == '0' && !(this_header & 3)) { |
| state = Start; |
| written = write_buffer(buf, len); |
| buf += written; |
| len -= written; |
| continue; |
| } |
| if (!*buf) { |
| buf++; |
| len--; |
| this_header++; |
| continue; |
| } |
| this_header = 0; |
| decompress = decompress_method(buf, len, &compress_name); |
| pr_debug("Detected %s compressed data\n", compress_name); |
| if (decompress) { |
| int res = decompress(buf, len, NULL, flush_buffer, NULL, |
| &my_inptr, error); |
| if (res) |
| error("decompressor failed"); |
| } else if (compress_name) { |
| if (!message) { |
| snprintf(msg_buf, sizeof msg_buf, |
| "compression method %s not configured", |
| compress_name); |
| message = msg_buf; |
| } |
| } else |
| error("junk in compressed archive"); |
| if (state != Reset) |
| error("junk in compressed archive"); |
| this_header = saved_offset + my_inptr; |
| buf += my_inptr; |
| len -= my_inptr; |
| } |
| dir_utime(); |
| kfree(name_buf); |
| kfree(symlink_buf); |
| kfree(header_buf); |
| return message; |
| } |
| |
| static int __initdata do_retain_initrd; |
| |
| static int __init retain_initrd_param(char *str) |
| { |
| if (*str) |
| return 0; |
| do_retain_initrd = 1; |
| return 1; |
| } |
| __setup("retain_initrd", retain_initrd_param); |
| |
| extern char __initramfs_start[]; |
| extern unsigned long __initramfs_size; |
| #include <linux/initrd.h> |
| #include <linux/kexec.h> |
| |
| static void __init free_initrd(void) |
| { |
| #ifdef CONFIG_KEXEC_CORE |
| unsigned long crashk_start = (unsigned long)__va(crashk_res.start); |
| unsigned long crashk_end = (unsigned long)__va(crashk_res.end); |
| #endif |
| if (do_retain_initrd) |
| goto skip; |
| |
| #ifdef CONFIG_KEXEC_CORE |
| /* |
| * If the initrd region is overlapped with crashkernel reserved region, |
| * free only memory that is not part of crashkernel region. |
| */ |
| if (initrd_start < crashk_end && initrd_end > crashk_start) { |
| /* |
| * Initialize initrd memory region since the kexec boot does |
| * not do. |
| */ |
| memset((void *)initrd_start, 0, initrd_end - initrd_start); |
| if (initrd_start < crashk_start) |
| free_initrd_mem(initrd_start, crashk_start); |
| if (initrd_end > crashk_end) |
| free_initrd_mem(crashk_end, initrd_end); |
| } else |
| #endif |
| free_initrd_mem(initrd_start, initrd_end); |
| skip: |
| initrd_start = 0; |
| initrd_end = 0; |
| } |
| |
| #ifdef CONFIG_BLK_DEV_RAM |
| #define BUF_SIZE 1024 |
| static void __init clean_rootfs(void) |
| { |
| int fd; |
| void *buf; |
| struct linux_dirent64 *dirp; |
| int num; |
| |
| fd = sys_open("/", O_RDONLY, 0); |
| WARN_ON(fd < 0); |
| if (fd < 0) |
| return; |
| buf = kzalloc(BUF_SIZE, GFP_KERNEL); |
| WARN_ON(!buf); |
| if (!buf) { |
| sys_close(fd); |
| return; |
| } |
| |
| dirp = buf; |
| num = sys_getdents64(fd, dirp, BUF_SIZE); |
| while (num > 0) { |
| while (num > 0) { |
| struct stat st; |
| int ret; |
| |
| ret = sys_newlstat(dirp->d_name, &st); |
| WARN_ON_ONCE(ret); |
| if (!ret) { |
| if (S_ISDIR(st.st_mode)) |
| sys_rmdir(dirp->d_name); |
| else |
| sys_unlink(dirp->d_name); |
| } |
| |
| num -= dirp->d_reclen; |
| dirp = (void *)dirp + dirp->d_reclen; |
| } |
| dirp = buf; |
| memset(buf, 0, BUF_SIZE); |
| num = sys_getdents64(fd, dirp, BUF_SIZE); |
| } |
| |
| sys_close(fd); |
| kfree(buf); |
| } |
| #endif |
| |
| static int __init populate_rootfs(void) |
| { |
| /* Load the built in initramfs */ |
| char *err = unpack_to_rootfs(__initramfs_start, __initramfs_size); |
| if (err) |
| panic("%s", err); /* Failed to decompress INTERNAL initramfs */ |
| /* If available load the bootloader supplied initrd */ |
| if (initrd_start && !IS_ENABLED(CONFIG_INITRAMFS_FORCE)) { |
| #ifdef CONFIG_BLK_DEV_RAM |
| int fd; |
| printk(KERN_INFO "Trying to unpack rootfs image as initramfs...\n"); |
| err = unpack_to_rootfs((char *)initrd_start, |
| initrd_end - initrd_start); |
| if (!err) { |
| free_initrd(); |
| goto done; |
| } else { |
| clean_rootfs(); |
| unpack_to_rootfs(__initramfs_start, __initramfs_size); |
| } |
| printk(KERN_INFO "rootfs image is not initramfs (%s)" |
| "; looks like an initrd\n", err); |
| fd = sys_open("/initrd.image", |
| O_WRONLY|O_CREAT, 0700); |
| if (fd >= 0) { |
| ssize_t written = xwrite(fd, (char *)initrd_start, |
| initrd_end - initrd_start); |
| |
| if (written != initrd_end - initrd_start) |
| pr_err("/initrd.image: incomplete write (%zd != %ld)\n", |
| written, initrd_end - initrd_start); |
| |
| sys_close(fd); |
| free_initrd(); |
| } |
| done: |
| /* empty statement */; |
| #else |
| printk(KERN_INFO "Unpacking initramfs...\n"); |
| err = unpack_to_rootfs((char *)initrd_start, |
| initrd_end - initrd_start); |
| if (err) |
| printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err); |
| free_initrd(); |
| #endif |
| } |
| flush_delayed_fput(); |
| /* |
| * Try loading default modules from initramfs. This gives |
| * us a chance to load before device_initcalls. |
| */ |
| load_default_modules(); |
| |
| return 0; |
| } |
| rootfs_initcall(populate_rootfs); |