1*b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0 2c67e5382SH Hartley Sweeten /* 3c67e5382SH Hartley Sweeten * Many of the syscalls used in this file expect some of the arguments 4c67e5382SH Hartley Sweeten * to be __user pointers not __kernel pointers. To limit the sparse 5c67e5382SH Hartley Sweeten * noise, turn off sparse checking for this file. 6c67e5382SH Hartley Sweeten */ 7c67e5382SH Hartley Sweeten #ifdef __CHECKER__ 8c67e5382SH Hartley Sweeten #undef __CHECKER__ 9c67e5382SH Hartley Sweeten #warning "Sparse checking disabled for this file" 10c67e5382SH Hartley Sweeten #endif 11c67e5382SH Hartley Sweeten 121da177e4SLinus Torvalds #include <linux/init.h> 131da177e4SLinus Torvalds #include <linux/fs.h> 141da177e4SLinus Torvalds #include <linux/slab.h> 151da177e4SLinus Torvalds #include <linux/types.h> 161da177e4SLinus Torvalds #include <linux/fcntl.h> 171da177e4SLinus Torvalds #include <linux/delay.h> 181da177e4SLinus Torvalds #include <linux/string.h> 19df52092fSLi, Shaohua #include <linux/dirent.h> 201da177e4SLinus Torvalds #include <linux/syscalls.h> 21889d51a1SNye Liu #include <linux/utime.h> 2208865514SLokesh Vutla #include <linux/file.h> 231da177e4SLinus Torvalds 2438747439SYinghai Lu static ssize_t __init xwrite(int fd, const char *p, size_t count) 2538747439SYinghai Lu { 2638747439SYinghai Lu ssize_t out = 0; 2738747439SYinghai Lu 2838747439SYinghai Lu /* sys_write only can write MAX_RW_COUNT aka 2G-4K bytes at most */ 2938747439SYinghai Lu while (count) { 3038747439SYinghai Lu ssize_t rv = sys_write(fd, p, count); 3138747439SYinghai Lu 3238747439SYinghai Lu if (rv < 0) { 3338747439SYinghai Lu if (rv == -EINTR || rv == -EAGAIN) 3438747439SYinghai Lu continue; 3538747439SYinghai Lu return out ? out : rv; 3638747439SYinghai Lu } else if (rv == 0) 3738747439SYinghai Lu break; 3838747439SYinghai Lu 3938747439SYinghai Lu p += rv; 4038747439SYinghai Lu out += rv; 4138747439SYinghai Lu count -= rv; 4238747439SYinghai Lu } 4338747439SYinghai Lu 4438747439SYinghai Lu return out; 4538747439SYinghai Lu } 4638747439SYinghai Lu 471da177e4SLinus Torvalds static __initdata char *message; 481da177e4SLinus Torvalds static void __init error(char *x) 491da177e4SLinus Torvalds { 501da177e4SLinus Torvalds if (!message) 511da177e4SLinus Torvalds message = x; 521da177e4SLinus Torvalds } 531da177e4SLinus Torvalds 541da177e4SLinus Torvalds /* link hash */ 551da177e4SLinus Torvalds 566a050da4SMark Huang #define N_ALIGN(len) ((((len) + 1) & ~3) + 2) 576a050da4SMark Huang 581da177e4SLinus Torvalds static __initdata struct hash { 591da177e4SLinus Torvalds int ino, minor, major; 60685dd2d5SAl Viro umode_t mode; 611da177e4SLinus Torvalds struct hash *next; 626a050da4SMark Huang char name[N_ALIGN(PATH_MAX)]; 631da177e4SLinus Torvalds } *head[32]; 641da177e4SLinus Torvalds 651da177e4SLinus Torvalds static inline int hash(int major, int minor, int ino) 661da177e4SLinus Torvalds { 671da177e4SLinus Torvalds unsigned long tmp = ino + minor + (major << 3); 681da177e4SLinus Torvalds tmp += tmp >> 5; 691da177e4SLinus Torvalds return tmp & 31; 701da177e4SLinus Torvalds } 711da177e4SLinus Torvalds 722139a7fbSH. Peter Anvin static char __init *find_link(int major, int minor, int ino, 73685dd2d5SAl Viro umode_t mode, char *name) 741da177e4SLinus Torvalds { 751da177e4SLinus Torvalds struct hash **p, *q; 761da177e4SLinus Torvalds for (p = head + hash(major, minor, ino); *p; p = &(*p)->next) { 771da177e4SLinus Torvalds if ((*p)->ino != ino) 781da177e4SLinus Torvalds continue; 791da177e4SLinus Torvalds if ((*p)->minor != minor) 801da177e4SLinus Torvalds continue; 811da177e4SLinus Torvalds if ((*p)->major != major) 821da177e4SLinus Torvalds continue; 832139a7fbSH. Peter Anvin if (((*p)->mode ^ mode) & S_IFMT) 842139a7fbSH. Peter Anvin continue; 851da177e4SLinus Torvalds return (*p)->name; 861da177e4SLinus Torvalds } 873265e66bSThomas Petazzoni q = kmalloc(sizeof(struct hash), GFP_KERNEL); 881da177e4SLinus Torvalds if (!q) 891da177e4SLinus Torvalds panic("can't allocate link hash entry"); 901da177e4SLinus Torvalds q->major = major; 912139a7fbSH. Peter Anvin q->minor = minor; 922139a7fbSH. Peter Anvin q->ino = ino; 932139a7fbSH. Peter Anvin q->mode = mode; 946a050da4SMark Huang strcpy(q->name, name); 951da177e4SLinus Torvalds q->next = NULL; 961da177e4SLinus Torvalds *p = q; 971da177e4SLinus Torvalds return NULL; 981da177e4SLinus Torvalds } 991da177e4SLinus Torvalds 1001da177e4SLinus Torvalds static void __init free_hash(void) 1011da177e4SLinus Torvalds { 1021da177e4SLinus Torvalds struct hash **p, *q; 1031da177e4SLinus Torvalds for (p = head; p < head + 32; p++) { 1041da177e4SLinus Torvalds while (*p) { 1051da177e4SLinus Torvalds q = *p; 1061da177e4SLinus Torvalds *p = q->next; 1073265e66bSThomas Petazzoni kfree(q); 1081da177e4SLinus Torvalds } 1091da177e4SLinus Torvalds } 1101da177e4SLinus Torvalds } 1111da177e4SLinus Torvalds 112c67e5382SH Hartley Sweeten static long __init do_utime(char *filename, time_t mtime) 113889d51a1SNye Liu { 114aaed2dd8SDeepa Dinamani struct timespec64 t[2]; 115889d51a1SNye Liu 116889d51a1SNye Liu t[0].tv_sec = mtime; 117889d51a1SNye Liu t[0].tv_nsec = 0; 118889d51a1SNye Liu t[1].tv_sec = mtime; 119889d51a1SNye Liu t[1].tv_nsec = 0; 120889d51a1SNye Liu 121889d51a1SNye Liu return do_utimes(AT_FDCWD, filename, t, AT_SYMLINK_NOFOLLOW); 122889d51a1SNye Liu } 123889d51a1SNye Liu 124889d51a1SNye Liu static __initdata LIST_HEAD(dir_list); 125889d51a1SNye Liu struct dir_entry { 126889d51a1SNye Liu struct list_head list; 127889d51a1SNye Liu char *name; 128889d51a1SNye Liu time_t mtime; 129889d51a1SNye Liu }; 130889d51a1SNye Liu 131889d51a1SNye Liu static void __init dir_add(const char *name, time_t mtime) 132889d51a1SNye Liu { 133889d51a1SNye Liu struct dir_entry *de = kmalloc(sizeof(struct dir_entry), GFP_KERNEL); 134889d51a1SNye Liu if (!de) 135889d51a1SNye Liu panic("can't allocate dir_entry buffer"); 136889d51a1SNye Liu INIT_LIST_HEAD(&de->list); 137889d51a1SNye Liu de->name = kstrdup(name, GFP_KERNEL); 138889d51a1SNye Liu de->mtime = mtime; 139889d51a1SNye Liu list_add(&de->list, &dir_list); 140889d51a1SNye Liu } 141889d51a1SNye Liu 142889d51a1SNye Liu static void __init dir_utime(void) 143889d51a1SNye Liu { 144889d51a1SNye Liu struct dir_entry *de, *tmp; 145889d51a1SNye Liu list_for_each_entry_safe(de, tmp, &dir_list, list) { 146889d51a1SNye Liu list_del(&de->list); 147889d51a1SNye Liu do_utime(de->name, de->mtime); 148889d51a1SNye Liu kfree(de->name); 149889d51a1SNye Liu kfree(de); 150889d51a1SNye Liu } 151889d51a1SNye Liu } 152889d51a1SNye Liu 153889d51a1SNye Liu static __initdata time_t mtime; 154889d51a1SNye Liu 1551da177e4SLinus Torvalds /* cpio header parsing */ 1561da177e4SLinus Torvalds 1571da177e4SLinus Torvalds static __initdata unsigned long ino, major, minor, nlink; 158685dd2d5SAl Viro static __initdata umode_t mode; 1591da177e4SLinus Torvalds static __initdata unsigned long body_len, name_len; 1601da177e4SLinus Torvalds static __initdata uid_t uid; 1611da177e4SLinus Torvalds static __initdata gid_t gid; 1621da177e4SLinus Torvalds static __initdata unsigned rdev; 1631da177e4SLinus Torvalds 1641da177e4SLinus Torvalds static void __init parse_header(char *s) 1651da177e4SLinus Torvalds { 1661da177e4SLinus Torvalds unsigned long parsed[12]; 1671da177e4SLinus Torvalds char buf[9]; 1681da177e4SLinus Torvalds int i; 1691da177e4SLinus Torvalds 1701da177e4SLinus Torvalds buf[8] = '\0'; 1711da177e4SLinus Torvalds for (i = 0, s += 6; i < 12; i++, s += 8) { 1721da177e4SLinus Torvalds memcpy(buf, s, 8); 1731da177e4SLinus Torvalds parsed[i] = simple_strtoul(buf, NULL, 16); 1741da177e4SLinus Torvalds } 1751da177e4SLinus Torvalds ino = parsed[0]; 1761da177e4SLinus Torvalds mode = parsed[1]; 1771da177e4SLinus Torvalds uid = parsed[2]; 1781da177e4SLinus Torvalds gid = parsed[3]; 1791da177e4SLinus Torvalds nlink = parsed[4]; 180889d51a1SNye Liu mtime = parsed[5]; 1811da177e4SLinus Torvalds body_len = parsed[6]; 1821da177e4SLinus Torvalds major = parsed[7]; 1831da177e4SLinus Torvalds minor = parsed[8]; 1841da177e4SLinus Torvalds rdev = new_encode_dev(MKDEV(parsed[9], parsed[10])); 1851da177e4SLinus Torvalds name_len = parsed[11]; 1861da177e4SLinus Torvalds } 1871da177e4SLinus Torvalds 1881da177e4SLinus Torvalds /* FSM */ 1891da177e4SLinus Torvalds 1901da177e4SLinus Torvalds static __initdata enum state { 1911da177e4SLinus Torvalds Start, 1921da177e4SLinus Torvalds Collect, 1931da177e4SLinus Torvalds GotHeader, 1941da177e4SLinus Torvalds SkipIt, 1951da177e4SLinus Torvalds GotName, 1961da177e4SLinus Torvalds CopyFile, 1971da177e4SLinus Torvalds GotSymlink, 1981da177e4SLinus Torvalds Reset 1991da177e4SLinus Torvalds } state, next_state; 2001da177e4SLinus Torvalds 2011da177e4SLinus Torvalds static __initdata char *victim; 202c34d85acSMark Rustad static unsigned long byte_count __initdata; 2031da177e4SLinus Torvalds static __initdata loff_t this_header, next_header; 2041da177e4SLinus Torvalds 205b0a5ab93SAl Viro static inline void __init eat(unsigned n) 2061da177e4SLinus Torvalds { 2071da177e4SLinus Torvalds victim += n; 2081da177e4SLinus Torvalds this_header += n; 209c34d85acSMark Rustad byte_count -= n; 2101da177e4SLinus Torvalds } 2111da177e4SLinus Torvalds 212889d51a1SNye Liu static __initdata char *vcollected; 2131da177e4SLinus Torvalds static __initdata char *collected; 214d97b07c5SYinghai Lu static long remains __initdata; 2151da177e4SLinus Torvalds static __initdata char *collect; 2161da177e4SLinus Torvalds 2171da177e4SLinus Torvalds static void __init read_into(char *buf, unsigned size, enum state next) 2181da177e4SLinus Torvalds { 219c34d85acSMark Rustad if (byte_count >= size) { 2201da177e4SLinus Torvalds collected = victim; 2211da177e4SLinus Torvalds eat(size); 2221da177e4SLinus Torvalds state = next; 2231da177e4SLinus Torvalds } else { 2241da177e4SLinus Torvalds collect = collected = buf; 2251da177e4SLinus Torvalds remains = size; 2261da177e4SLinus Torvalds next_state = next; 2271da177e4SLinus Torvalds state = Collect; 2281da177e4SLinus Torvalds } 2291da177e4SLinus Torvalds } 2301da177e4SLinus Torvalds 2311da177e4SLinus Torvalds static __initdata char *header_buf, *symlink_buf, *name_buf; 2321da177e4SLinus Torvalds 2331da177e4SLinus Torvalds static int __init do_start(void) 2341da177e4SLinus Torvalds { 2351da177e4SLinus Torvalds read_into(header_buf, 110, GotHeader); 2361da177e4SLinus Torvalds return 0; 2371da177e4SLinus Torvalds } 2381da177e4SLinus Torvalds 2391da177e4SLinus Torvalds static int __init do_collect(void) 2401da177e4SLinus Torvalds { 241d97b07c5SYinghai Lu unsigned long n = remains; 242c34d85acSMark Rustad if (byte_count < n) 243c34d85acSMark Rustad n = byte_count; 2441da177e4SLinus Torvalds memcpy(collect, victim, n); 2451da177e4SLinus Torvalds eat(n); 2461da177e4SLinus Torvalds collect += n; 2471da177e4SLinus Torvalds if ((remains -= n) != 0) 2481da177e4SLinus Torvalds return 1; 2491da177e4SLinus Torvalds state = next_state; 2501da177e4SLinus Torvalds return 0; 2511da177e4SLinus Torvalds } 2521da177e4SLinus Torvalds 2531da177e4SLinus Torvalds static int __init do_header(void) 2541da177e4SLinus Torvalds { 2552e591bbcSArjan van de Ven if (memcmp(collected, "070707", 6)==0) { 2562e591bbcSArjan van de Ven error("incorrect cpio method used: use -H newc option"); 2572e591bbcSArjan van de Ven return 1; 2582e591bbcSArjan van de Ven } 2591da177e4SLinus Torvalds if (memcmp(collected, "070701", 6)) { 2601da177e4SLinus Torvalds error("no cpio magic"); 2611da177e4SLinus Torvalds return 1; 2621da177e4SLinus Torvalds } 2631da177e4SLinus Torvalds parse_header(collected); 2641da177e4SLinus Torvalds next_header = this_header + N_ALIGN(name_len) + body_len; 2651da177e4SLinus Torvalds next_header = (next_header + 3) & ~3; 2661da177e4SLinus Torvalds state = SkipIt; 2671da177e4SLinus Torvalds if (name_len <= 0 || name_len > PATH_MAX) 2681da177e4SLinus Torvalds return 0; 2691da177e4SLinus Torvalds if (S_ISLNK(mode)) { 2701da177e4SLinus Torvalds if (body_len > PATH_MAX) 2711da177e4SLinus Torvalds return 0; 2721da177e4SLinus Torvalds collect = collected = symlink_buf; 2731da177e4SLinus Torvalds remains = N_ALIGN(name_len) + body_len; 2741da177e4SLinus Torvalds next_state = GotSymlink; 2751da177e4SLinus Torvalds state = Collect; 2761da177e4SLinus Torvalds return 0; 2771da177e4SLinus Torvalds } 2781da177e4SLinus Torvalds if (S_ISREG(mode) || !body_len) 2791da177e4SLinus Torvalds read_into(name_buf, N_ALIGN(name_len), GotName); 2801da177e4SLinus Torvalds return 0; 2811da177e4SLinus Torvalds } 2821da177e4SLinus Torvalds 2831da177e4SLinus Torvalds static int __init do_skip(void) 2841da177e4SLinus Torvalds { 285c34d85acSMark Rustad if (this_header + byte_count < next_header) { 286c34d85acSMark Rustad eat(byte_count); 2871da177e4SLinus Torvalds return 1; 2881da177e4SLinus Torvalds } else { 2891da177e4SLinus Torvalds eat(next_header - this_header); 2901da177e4SLinus Torvalds state = next_state; 2911da177e4SLinus Torvalds return 0; 2921da177e4SLinus Torvalds } 2931da177e4SLinus Torvalds } 2941da177e4SLinus Torvalds 2951da177e4SLinus Torvalds static int __init do_reset(void) 2961da177e4SLinus Torvalds { 297c34d85acSMark Rustad while (byte_count && *victim == '\0') 2981da177e4SLinus Torvalds eat(1); 299c34d85acSMark Rustad if (byte_count && (this_header & 3)) 3001da177e4SLinus Torvalds error("broken padding"); 3011da177e4SLinus Torvalds return 1; 3021da177e4SLinus Torvalds } 3031da177e4SLinus Torvalds 3041da177e4SLinus Torvalds static int __init maybe_link(void) 3051da177e4SLinus Torvalds { 3061da177e4SLinus Torvalds if (nlink >= 2) { 3072139a7fbSH. Peter Anvin char *old = find_link(major, minor, ino, mode, collected); 3081da177e4SLinus Torvalds if (old) 3091da177e4SLinus Torvalds return (sys_link(old, collected) < 0) ? -1 : 1; 3101da177e4SLinus Torvalds } 3111da177e4SLinus Torvalds return 0; 3121da177e4SLinus Torvalds } 3131da177e4SLinus Torvalds 314c34d85acSMark Rustad static void __init clean_path(char *path, umode_t fmode) 3152139a7fbSH. Peter Anvin { 316046aa126SArnd Bergmann struct kstat st; 3172139a7fbSH. Peter Anvin 318046aa126SArnd Bergmann if (!vfs_lstat(path, &st) && (st.mode ^ fmode) & S_IFMT) { 319046aa126SArnd Bergmann if (S_ISDIR(st.mode)) 3202139a7fbSH. Peter Anvin sys_rmdir(path); 3212139a7fbSH. Peter Anvin else 3222139a7fbSH. Peter Anvin sys_unlink(path); 3232139a7fbSH. Peter Anvin } 3242139a7fbSH. Peter Anvin } 3252139a7fbSH. Peter Anvin 3261da177e4SLinus Torvalds static __initdata int wfd; 3271da177e4SLinus Torvalds 3281da177e4SLinus Torvalds static int __init do_name(void) 3291da177e4SLinus Torvalds { 3301da177e4SLinus Torvalds state = SkipIt; 3311da177e4SLinus Torvalds next_state = Reset; 3321da177e4SLinus Torvalds if (strcmp(collected, "TRAILER!!!") == 0) { 3331da177e4SLinus Torvalds free_hash(); 3341da177e4SLinus Torvalds return 0; 3351da177e4SLinus Torvalds } 3362139a7fbSH. Peter Anvin clean_path(collected, mode); 3371da177e4SLinus Torvalds if (S_ISREG(mode)) { 3382139a7fbSH. Peter Anvin int ml = maybe_link(); 3392139a7fbSH. Peter Anvin if (ml >= 0) { 3402139a7fbSH. Peter Anvin int openflags = O_WRONLY|O_CREAT; 3412139a7fbSH. Peter Anvin if (ml != 1) 3422139a7fbSH. Peter Anvin openflags |= O_TRUNC; 3432139a7fbSH. Peter Anvin wfd = sys_open(collected, openflags, mode); 3442139a7fbSH. Peter Anvin 3451da177e4SLinus Torvalds if (wfd >= 0) { 3461da177e4SLinus Torvalds sys_fchown(wfd, uid, gid); 3471da177e4SLinus Torvalds sys_fchmod(wfd, mode); 348d20d5a74SRandy Robertson if (body_len) 349cb6ff208SDavid Howells sys_ftruncate(wfd, body_len); 350889d51a1SNye Liu vcollected = kstrdup(collected, GFP_KERNEL); 3511da177e4SLinus Torvalds state = CopyFile; 3521da177e4SLinus Torvalds } 3531da177e4SLinus Torvalds } 3541da177e4SLinus Torvalds } else if (S_ISDIR(mode)) { 3551da177e4SLinus Torvalds sys_mkdir(collected, mode); 3561da177e4SLinus Torvalds sys_chown(collected, uid, gid); 3571da177e4SLinus Torvalds sys_chmod(collected, mode); 358889d51a1SNye Liu dir_add(collected, mtime); 3591da177e4SLinus Torvalds } else if (S_ISBLK(mode) || S_ISCHR(mode) || 3601da177e4SLinus Torvalds S_ISFIFO(mode) || S_ISSOCK(mode)) { 3611da177e4SLinus Torvalds if (maybe_link() == 0) { 3621da177e4SLinus Torvalds sys_mknod(collected, mode, rdev); 3631da177e4SLinus Torvalds sys_chown(collected, uid, gid); 3641da177e4SLinus Torvalds sys_chmod(collected, mode); 365889d51a1SNye Liu do_utime(collected, mtime); 3661da177e4SLinus Torvalds } 3671da177e4SLinus Torvalds } 3681da177e4SLinus Torvalds return 0; 3691da177e4SLinus Torvalds } 3701da177e4SLinus Torvalds 3711da177e4SLinus Torvalds static int __init do_copy(void) 3721da177e4SLinus Torvalds { 373c34d85acSMark Rustad if (byte_count >= body_len) { 3749687fd91SDavid Engraf if (xwrite(wfd, victim, body_len) != body_len) 3759687fd91SDavid Engraf error("write error"); 3761da177e4SLinus Torvalds sys_close(wfd); 377889d51a1SNye Liu do_utime(vcollected, mtime); 378889d51a1SNye Liu kfree(vcollected); 3791da177e4SLinus Torvalds eat(body_len); 3801da177e4SLinus Torvalds state = SkipIt; 3811da177e4SLinus Torvalds return 0; 3821da177e4SLinus Torvalds } else { 383c34d85acSMark Rustad if (xwrite(wfd, victim, byte_count) != byte_count) 3849687fd91SDavid Engraf error("write error"); 385c34d85acSMark Rustad body_len -= byte_count; 386c34d85acSMark Rustad eat(byte_count); 3871da177e4SLinus Torvalds return 1; 3881da177e4SLinus Torvalds } 3891da177e4SLinus Torvalds } 3901da177e4SLinus Torvalds 3911da177e4SLinus Torvalds static int __init do_symlink(void) 3921da177e4SLinus Torvalds { 3931da177e4SLinus Torvalds collected[N_ALIGN(name_len) + body_len] = '\0'; 3942139a7fbSH. Peter Anvin clean_path(collected, 0); 3951da177e4SLinus Torvalds sys_symlink(collected + N_ALIGN(name_len), collected); 3961da177e4SLinus Torvalds sys_lchown(collected, uid, gid); 397889d51a1SNye Liu do_utime(collected, mtime); 3981da177e4SLinus Torvalds state = SkipIt; 3991da177e4SLinus Torvalds next_state = Reset; 4001da177e4SLinus Torvalds return 0; 4011da177e4SLinus Torvalds } 4021da177e4SLinus Torvalds 4031da177e4SLinus Torvalds static __initdata int (*actions[])(void) = { 4041da177e4SLinus Torvalds [Start] = do_start, 4051da177e4SLinus Torvalds [Collect] = do_collect, 4061da177e4SLinus Torvalds [GotHeader] = do_header, 4071da177e4SLinus Torvalds [SkipIt] = do_skip, 4081da177e4SLinus Torvalds [GotName] = do_name, 4091da177e4SLinus Torvalds [CopyFile] = do_copy, 4101da177e4SLinus Torvalds [GotSymlink] = do_symlink, 4111da177e4SLinus Torvalds [Reset] = do_reset, 4121da177e4SLinus Torvalds }; 4131da177e4SLinus Torvalds 414d97b07c5SYinghai Lu static long __init write_buffer(char *buf, unsigned long len) 4151da177e4SLinus Torvalds { 416c34d85acSMark Rustad byte_count = len; 4171da177e4SLinus Torvalds victim = buf; 4181da177e4SLinus Torvalds 4191da177e4SLinus Torvalds while (!actions[state]()) 4201da177e4SLinus Torvalds ; 421c34d85acSMark Rustad return len - byte_count; 4221da177e4SLinus Torvalds } 4231da177e4SLinus Torvalds 424d97b07c5SYinghai Lu static long __init flush_buffer(void *bufv, unsigned long len) 4251da177e4SLinus Torvalds { 42630d65dbfSAlain Knaff char *buf = (char *) bufv; 427d97b07c5SYinghai Lu long written; 428d97b07c5SYinghai Lu long origLen = len; 4291da177e4SLinus Torvalds if (message) 43030d65dbfSAlain Knaff return -1; 4311da177e4SLinus Torvalds while ((written = write_buffer(buf, len)) < len && !message) { 4321da177e4SLinus Torvalds char c = buf[written]; 4331da177e4SLinus Torvalds if (c == '0') { 4341da177e4SLinus Torvalds buf += written; 4351da177e4SLinus Torvalds len -= written; 4361da177e4SLinus Torvalds state = Start; 4371da177e4SLinus Torvalds } else if (c == 0) { 4381da177e4SLinus Torvalds buf += written; 4391da177e4SLinus Torvalds len -= written; 4401da177e4SLinus Torvalds state = Reset; 4411da177e4SLinus Torvalds } else 4421da177e4SLinus Torvalds error("junk in compressed archive"); 4431da177e4SLinus Torvalds } 44430d65dbfSAlain Knaff return origLen; 4451da177e4SLinus Torvalds } 4461da177e4SLinus Torvalds 447d97b07c5SYinghai Lu static unsigned long my_inptr; /* index of next byte to be processed in inbuf */ 4481da177e4SLinus Torvalds 449889c92d2SH. Peter Anvin #include <linux/decompress/generic.h> 4501da177e4SLinus Torvalds 451d97b07c5SYinghai Lu static char * __init unpack_to_rootfs(char *buf, unsigned long len) 4521da177e4SLinus Torvalds { 453d97b07c5SYinghai Lu long written; 454889c92d2SH. Peter Anvin decompress_fn decompress; 45523a22d57SH. Peter Anvin const char *compress_name; 45623a22d57SH. Peter Anvin static __initdata char msg_buf[64]; 457889c92d2SH. Peter Anvin 4583265e66bSThomas Petazzoni header_buf = kmalloc(110, GFP_KERNEL); 4593265e66bSThomas Petazzoni symlink_buf = kmalloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1, GFP_KERNEL); 4603265e66bSThomas Petazzoni name_buf = kmalloc(N_ALIGN(PATH_MAX), GFP_KERNEL); 46130d65dbfSAlain Knaff 46230d65dbfSAlain Knaff if (!header_buf || !symlink_buf || !name_buf) 4631da177e4SLinus Torvalds panic("can't allocate buffers"); 46430d65dbfSAlain Knaff 4651da177e4SLinus Torvalds state = Start; 4661da177e4SLinus Torvalds this_header = 0; 4671da177e4SLinus Torvalds message = NULL; 4681da177e4SLinus Torvalds while (!message && len) { 4691da177e4SLinus Torvalds loff_t saved_offset = this_header; 4701da177e4SLinus Torvalds if (*buf == '0' && !(this_header & 3)) { 4711da177e4SLinus Torvalds state = Start; 4721da177e4SLinus Torvalds written = write_buffer(buf, len); 4731da177e4SLinus Torvalds buf += written; 4741da177e4SLinus Torvalds len -= written; 4751da177e4SLinus Torvalds continue; 4761da177e4SLinus Torvalds } 4771da177e4SLinus Torvalds if (!*buf) { 4781da177e4SLinus Torvalds buf++; 4791da177e4SLinus Torvalds len--; 4801da177e4SLinus Torvalds this_header++; 4811da177e4SLinus Torvalds continue; 4821da177e4SLinus Torvalds } 4831da177e4SLinus Torvalds this_header = 0; 48423a22d57SH. Peter Anvin decompress = decompress_method(buf, len, &compress_name); 4856aa7a29aSDaniel M. Weeks pr_debug("Detected %s compressed data\n", compress_name); 48654291362SPhillip Lougher if (decompress) { 487d97b07c5SYinghai Lu int res = decompress(buf, len, NULL, flush_buffer, NULL, 488889c92d2SH. Peter Anvin &my_inptr, error); 48954291362SPhillip Lougher if (res) 49054291362SPhillip Lougher error("decompressor failed"); 49154291362SPhillip Lougher } else if (compress_name) { 49223a22d57SH. Peter Anvin if (!message) { 49323a22d57SH. Peter Anvin snprintf(msg_buf, sizeof msg_buf, 49423a22d57SH. Peter Anvin "compression method %s not configured", 49523a22d57SH. Peter Anvin compress_name); 49623a22d57SH. Peter Anvin message = msg_buf; 49723a22d57SH. Peter Anvin } 498df37bd15SPhillip Lougher } else 499df37bd15SPhillip Lougher error("junk in compressed archive"); 5001da177e4SLinus Torvalds if (state != Reset) 50130d65dbfSAlain Knaff error("junk in compressed archive"); 50230d65dbfSAlain Knaff this_header = saved_offset + my_inptr; 50330d65dbfSAlain Knaff buf += my_inptr; 50430d65dbfSAlain Knaff len -= my_inptr; 5051da177e4SLinus Torvalds } 506889d51a1SNye Liu dir_utime(); 5073265e66bSThomas Petazzoni kfree(name_buf); 5083265e66bSThomas Petazzoni kfree(symlink_buf); 5093265e66bSThomas Petazzoni kfree(header_buf); 5101da177e4SLinus Torvalds return message; 5111da177e4SLinus Torvalds } 5121da177e4SLinus Torvalds 5130a7b35cbSMichael Neuling static int __initdata do_retain_initrd; 5140a7b35cbSMichael Neuling 5150a7b35cbSMichael Neuling static int __init retain_initrd_param(char *str) 5160a7b35cbSMichael Neuling { 5170a7b35cbSMichael Neuling if (*str) 5180a7b35cbSMichael Neuling return 0; 5190a7b35cbSMichael Neuling do_retain_initrd = 1; 5200a7b35cbSMichael Neuling return 1; 5210a7b35cbSMichael Neuling } 5220a7b35cbSMichael Neuling __setup("retain_initrd", retain_initrd_param); 5230a7b35cbSMichael Neuling 524ffe8018cSHendrik Brueckner extern char __initramfs_start[]; 525ffe8018cSHendrik Brueckner extern unsigned long __initramfs_size; 5261da177e4SLinus Torvalds #include <linux/initrd.h> 5279c15e852SHaren Myneni #include <linux/kexec.h> 5280f3d2bd5SJan Beulich 5290f3d2bd5SJan Beulich static void __init free_initrd(void) 5300f3d2bd5SJan Beulich { 5312965faa5SDave Young #ifdef CONFIG_KEXEC_CORE 5329c15e852SHaren Myneni unsigned long crashk_start = (unsigned long)__va(crashk_res.start); 5339c15e852SHaren Myneni unsigned long crashk_end = (unsigned long)__va(crashk_res.end); 5340a7b35cbSMichael Neuling #endif 5350a7b35cbSMichael Neuling if (do_retain_initrd) 5360a7b35cbSMichael Neuling goto skip; 5379c15e852SHaren Myneni 5382965faa5SDave Young #ifdef CONFIG_KEXEC_CORE 5399c15e852SHaren Myneni /* 5409c15e852SHaren Myneni * If the initrd region is overlapped with crashkernel reserved region, 5419c15e852SHaren Myneni * free only memory that is not part of crashkernel region. 5429c15e852SHaren Myneni */ 5439c15e852SHaren Myneni if (initrd_start < crashk_end && initrd_end > crashk_start) { 5449c15e852SHaren Myneni /* 5459c15e852SHaren Myneni * Initialize initrd memory region since the kexec boot does 5469c15e852SHaren Myneni * not do. 5479c15e852SHaren Myneni */ 5489c15e852SHaren Myneni memset((void *)initrd_start, 0, initrd_end - initrd_start); 5499c15e852SHaren Myneni if (initrd_start < crashk_start) 5509c15e852SHaren Myneni free_initrd_mem(initrd_start, crashk_start); 5519c15e852SHaren Myneni if (initrd_end > crashk_end) 5529c15e852SHaren Myneni free_initrd_mem(crashk_end, initrd_end); 5539c15e852SHaren Myneni } else 5549c15e852SHaren Myneni #endif 5550f3d2bd5SJan Beulich free_initrd_mem(initrd_start, initrd_end); 5560a7b35cbSMichael Neuling skip: 5570f3d2bd5SJan Beulich initrd_start = 0; 5580f3d2bd5SJan Beulich initrd_end = 0; 5590f3d2bd5SJan Beulich } 5600f3d2bd5SJan Beulich 561b52bb371SNikanth Karthikesan #ifdef CONFIG_BLK_DEV_RAM 562df52092fSLi, Shaohua #define BUF_SIZE 1024 563df52092fSLi, Shaohua static void __init clean_rootfs(void) 564df52092fSLi, Shaohua { 565df52092fSLi, Shaohua int fd; 566df52092fSLi, Shaohua void *buf; 567df52092fSLi, Shaohua struct linux_dirent64 *dirp; 5688aaed5beSH Hartley Sweeten int num; 569df52092fSLi, Shaohua 570c67e5382SH Hartley Sweeten fd = sys_open("/", O_RDONLY, 0); 571df52092fSLi, Shaohua WARN_ON(fd < 0); 572df52092fSLi, Shaohua if (fd < 0) 573df52092fSLi, Shaohua return; 574df52092fSLi, Shaohua buf = kzalloc(BUF_SIZE, GFP_KERNEL); 575df52092fSLi, Shaohua WARN_ON(!buf); 576df52092fSLi, Shaohua if (!buf) { 577df52092fSLi, Shaohua sys_close(fd); 578df52092fSLi, Shaohua return; 579df52092fSLi, Shaohua } 580df52092fSLi, Shaohua 581df52092fSLi, Shaohua dirp = buf; 5828aaed5beSH Hartley Sweeten num = sys_getdents64(fd, dirp, BUF_SIZE); 5838aaed5beSH Hartley Sweeten while (num > 0) { 5848aaed5beSH Hartley Sweeten while (num > 0) { 585046aa126SArnd Bergmann struct kstat st; 586df52092fSLi, Shaohua int ret; 587df52092fSLi, Shaohua 588046aa126SArnd Bergmann ret = vfs_lstat(dirp->d_name, &st); 589df52092fSLi, Shaohua WARN_ON_ONCE(ret); 590df52092fSLi, Shaohua if (!ret) { 591046aa126SArnd Bergmann if (S_ISDIR(st.mode)) 592df52092fSLi, Shaohua sys_rmdir(dirp->d_name); 593df52092fSLi, Shaohua else 594df52092fSLi, Shaohua sys_unlink(dirp->d_name); 595df52092fSLi, Shaohua } 596df52092fSLi, Shaohua 5978aaed5beSH Hartley Sweeten num -= dirp->d_reclen; 598df52092fSLi, Shaohua dirp = (void *)dirp + dirp->d_reclen; 599df52092fSLi, Shaohua } 600df52092fSLi, Shaohua dirp = buf; 601df52092fSLi, Shaohua memset(buf, 0, BUF_SIZE); 6028aaed5beSH Hartley Sweeten num = sys_getdents64(fd, dirp, BUF_SIZE); 603df52092fSLi, Shaohua } 604df52092fSLi, Shaohua 605df52092fSLi, Shaohua sys_close(fd); 606df52092fSLi, Shaohua kfree(buf); 607df52092fSLi, Shaohua } 608b52bb371SNikanth Karthikesan #endif 609df52092fSLi, Shaohua 6109a9e0d68SLinus Torvalds static int __init populate_rootfs(void) 6111da177e4SLinus Torvalds { 61217a9be31SStafford Horne /* Load the built in initramfs */ 613ffe8018cSHendrik Brueckner char *err = unpack_to_rootfs(__initramfs_start, __initramfs_size); 6141da177e4SLinus Torvalds if (err) 615499a4584STetsuo Handa panic("%s", err); /* Failed to decompress INTERNAL initramfs */ 61617a9be31SStafford Horne /* If available load the bootloader supplied initrd */ 617cff75e0bSDaniel Thompson if (initrd_start && !IS_ENABLED(CONFIG_INITRAMFS_FORCE)) { 618340e48e6SZdenek Pavlas #ifdef CONFIG_BLK_DEV_RAM 6191da177e4SLinus Torvalds int fd; 620a1e6b6c1SEric Piel printk(KERN_INFO "Trying to unpack rootfs image as initramfs...\n"); 6211da177e4SLinus Torvalds err = unpack_to_rootfs((char *)initrd_start, 622df52092fSLi, Shaohua initrd_end - initrd_start); 6231da177e4SLinus Torvalds if (!err) { 6240f3d2bd5SJan Beulich free_initrd(); 625bb813f4cSTejun Heo goto done; 626df52092fSLi, Shaohua } else { 627df52092fSLi, Shaohua clean_rootfs(); 628ffe8018cSHendrik Brueckner unpack_to_rootfs(__initramfs_start, __initramfs_size); 6291da177e4SLinus Torvalds } 630c1c490e0SSimon Kitching printk(KERN_INFO "rootfs image is not initramfs (%s)" 631c1c490e0SSimon Kitching "; looks like an initrd\n", err); 632c67e5382SH Hartley Sweeten fd = sys_open("/initrd.image", 633562f5e63SNamhyung Kim O_WRONLY|O_CREAT, 0700); 6341da177e4SLinus Torvalds if (fd >= 0) { 63538747439SYinghai Lu ssize_t written = xwrite(fd, (char *)initrd_start, 6361da177e4SLinus Torvalds initrd_end - initrd_start); 63738747439SYinghai Lu 63838747439SYinghai Lu if (written != initrd_end - initrd_start) 63938747439SYinghai Lu pr_err("/initrd.image: incomplete write (%zd != %ld)\n", 64038747439SYinghai Lu written, initrd_end - initrd_start); 64138747439SYinghai Lu 6421da177e4SLinus Torvalds sys_close(fd); 6430f3d2bd5SJan Beulich free_initrd(); 6441da177e4SLinus Torvalds } 645bb813f4cSTejun Heo done: 646394e4f5dSLinus Torvalds /* empty statement */; 647340e48e6SZdenek Pavlas #else 648a1e6b6c1SEric Piel printk(KERN_INFO "Unpacking initramfs...\n"); 649340e48e6SZdenek Pavlas err = unpack_to_rootfs((char *)initrd_start, 650df52092fSLi, Shaohua initrd_end - initrd_start); 651a1e6b6c1SEric Piel if (err) 652a1e6b6c1SEric Piel printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err); 653340e48e6SZdenek Pavlas free_initrd(); 654340e48e6SZdenek Pavlas #endif 65517a9be31SStafford Horne } 65608865514SLokesh Vutla flush_delayed_fput(); 657bb813f4cSTejun Heo /* 658bb813f4cSTejun Heo * Try loading default modules from initramfs. This gives 659bb813f4cSTejun Heo * us a chance to load before device_initcalls. 660bb813f4cSTejun Heo */ 661bb813f4cSTejun Heo load_default_modules(); 66217a9be31SStafford Horne 6638d610dd5SLinus Torvalds return 0; 6641da177e4SLinus Torvalds } 6658d610dd5SLinus Torvalds rootfs_initcall(populate_rootfs); 666