11da177e4SLinus Torvalds #include <linux/init.h> 21da177e4SLinus Torvalds #include <linux/fs.h> 31da177e4SLinus Torvalds #include <linux/slab.h> 41da177e4SLinus Torvalds #include <linux/types.h> 51da177e4SLinus Torvalds #include <linux/fcntl.h> 61da177e4SLinus Torvalds #include <linux/delay.h> 71da177e4SLinus Torvalds #include <linux/string.h> 8df52092fSLi, Shaohua #include <linux/dirent.h> 91da177e4SLinus Torvalds #include <linux/syscalls.h> 10889d51a1SNye Liu #include <linux/utime.h> 111da177e4SLinus Torvalds 121da177e4SLinus Torvalds static __initdata char *message; 131da177e4SLinus Torvalds static void __init error(char *x) 141da177e4SLinus Torvalds { 151da177e4SLinus Torvalds if (!message) 161da177e4SLinus Torvalds message = x; 171da177e4SLinus Torvalds } 181da177e4SLinus Torvalds 191da177e4SLinus Torvalds /* link hash */ 201da177e4SLinus Torvalds 216a050da4SMark Huang #define N_ALIGN(len) ((((len) + 1) & ~3) + 2) 226a050da4SMark Huang 231da177e4SLinus Torvalds static __initdata struct hash { 241da177e4SLinus Torvalds int ino, minor, major; 25*685dd2d5SAl Viro umode_t mode; 261da177e4SLinus Torvalds struct hash *next; 276a050da4SMark Huang char name[N_ALIGN(PATH_MAX)]; 281da177e4SLinus Torvalds } *head[32]; 291da177e4SLinus Torvalds 301da177e4SLinus Torvalds static inline int hash(int major, int minor, int ino) 311da177e4SLinus Torvalds { 321da177e4SLinus Torvalds unsigned long tmp = ino + minor + (major << 3); 331da177e4SLinus Torvalds tmp += tmp >> 5; 341da177e4SLinus Torvalds return tmp & 31; 351da177e4SLinus Torvalds } 361da177e4SLinus Torvalds 372139a7fbSH. Peter Anvin static char __init *find_link(int major, int minor, int ino, 38*685dd2d5SAl Viro umode_t mode, char *name) 391da177e4SLinus Torvalds { 401da177e4SLinus Torvalds struct hash **p, *q; 411da177e4SLinus Torvalds for (p = head + hash(major, minor, ino); *p; p = &(*p)->next) { 421da177e4SLinus Torvalds if ((*p)->ino != ino) 431da177e4SLinus Torvalds continue; 441da177e4SLinus Torvalds if ((*p)->minor != minor) 451da177e4SLinus Torvalds continue; 461da177e4SLinus Torvalds if ((*p)->major != major) 471da177e4SLinus Torvalds continue; 482139a7fbSH. Peter Anvin if (((*p)->mode ^ mode) & S_IFMT) 492139a7fbSH. Peter Anvin continue; 501da177e4SLinus Torvalds return (*p)->name; 511da177e4SLinus Torvalds } 523265e66bSThomas Petazzoni q = kmalloc(sizeof(struct hash), GFP_KERNEL); 531da177e4SLinus Torvalds if (!q) 541da177e4SLinus Torvalds panic("can't allocate link hash entry"); 551da177e4SLinus Torvalds q->major = major; 562139a7fbSH. Peter Anvin q->minor = minor; 572139a7fbSH. Peter Anvin q->ino = ino; 582139a7fbSH. Peter Anvin q->mode = mode; 596a050da4SMark Huang strcpy(q->name, name); 601da177e4SLinus Torvalds q->next = NULL; 611da177e4SLinus Torvalds *p = q; 621da177e4SLinus Torvalds return NULL; 631da177e4SLinus Torvalds } 641da177e4SLinus Torvalds 651da177e4SLinus Torvalds static void __init free_hash(void) 661da177e4SLinus Torvalds { 671da177e4SLinus Torvalds struct hash **p, *q; 681da177e4SLinus Torvalds for (p = head; p < head + 32; p++) { 691da177e4SLinus Torvalds while (*p) { 701da177e4SLinus Torvalds q = *p; 711da177e4SLinus Torvalds *p = q->next; 723265e66bSThomas Petazzoni kfree(q); 731da177e4SLinus Torvalds } 741da177e4SLinus Torvalds } 751da177e4SLinus Torvalds } 761da177e4SLinus Torvalds 77889d51a1SNye Liu static long __init do_utime(char __user *filename, time_t mtime) 78889d51a1SNye Liu { 79889d51a1SNye Liu struct timespec t[2]; 80889d51a1SNye Liu 81889d51a1SNye Liu t[0].tv_sec = mtime; 82889d51a1SNye Liu t[0].tv_nsec = 0; 83889d51a1SNye Liu t[1].tv_sec = mtime; 84889d51a1SNye Liu t[1].tv_nsec = 0; 85889d51a1SNye Liu 86889d51a1SNye Liu return do_utimes(AT_FDCWD, filename, t, AT_SYMLINK_NOFOLLOW); 87889d51a1SNye Liu } 88889d51a1SNye Liu 89889d51a1SNye Liu static __initdata LIST_HEAD(dir_list); 90889d51a1SNye Liu struct dir_entry { 91889d51a1SNye Liu struct list_head list; 92889d51a1SNye Liu char *name; 93889d51a1SNye Liu time_t mtime; 94889d51a1SNye Liu }; 95889d51a1SNye Liu 96889d51a1SNye Liu static void __init dir_add(const char *name, time_t mtime) 97889d51a1SNye Liu { 98889d51a1SNye Liu struct dir_entry *de = kmalloc(sizeof(struct dir_entry), GFP_KERNEL); 99889d51a1SNye Liu if (!de) 100889d51a1SNye Liu panic("can't allocate dir_entry buffer"); 101889d51a1SNye Liu INIT_LIST_HEAD(&de->list); 102889d51a1SNye Liu de->name = kstrdup(name, GFP_KERNEL); 103889d51a1SNye Liu de->mtime = mtime; 104889d51a1SNye Liu list_add(&de->list, &dir_list); 105889d51a1SNye Liu } 106889d51a1SNye Liu 107889d51a1SNye Liu static void __init dir_utime(void) 108889d51a1SNye Liu { 109889d51a1SNye Liu struct dir_entry *de, *tmp; 110889d51a1SNye Liu list_for_each_entry_safe(de, tmp, &dir_list, list) { 111889d51a1SNye Liu list_del(&de->list); 112889d51a1SNye Liu do_utime(de->name, de->mtime); 113889d51a1SNye Liu kfree(de->name); 114889d51a1SNye Liu kfree(de); 115889d51a1SNye Liu } 116889d51a1SNye Liu } 117889d51a1SNye Liu 118889d51a1SNye Liu static __initdata time_t mtime; 119889d51a1SNye Liu 1201da177e4SLinus Torvalds /* cpio header parsing */ 1211da177e4SLinus Torvalds 1221da177e4SLinus Torvalds static __initdata unsigned long ino, major, minor, nlink; 123*685dd2d5SAl Viro static __initdata umode_t mode; 1241da177e4SLinus Torvalds static __initdata unsigned long body_len, name_len; 1251da177e4SLinus Torvalds static __initdata uid_t uid; 1261da177e4SLinus Torvalds static __initdata gid_t gid; 1271da177e4SLinus Torvalds static __initdata unsigned rdev; 1281da177e4SLinus Torvalds 1291da177e4SLinus Torvalds static void __init parse_header(char *s) 1301da177e4SLinus Torvalds { 1311da177e4SLinus Torvalds unsigned long parsed[12]; 1321da177e4SLinus Torvalds char buf[9]; 1331da177e4SLinus Torvalds int i; 1341da177e4SLinus Torvalds 1351da177e4SLinus Torvalds buf[8] = '\0'; 1361da177e4SLinus Torvalds for (i = 0, s += 6; i < 12; i++, s += 8) { 1371da177e4SLinus Torvalds memcpy(buf, s, 8); 1381da177e4SLinus Torvalds parsed[i] = simple_strtoul(buf, NULL, 16); 1391da177e4SLinus Torvalds } 1401da177e4SLinus Torvalds ino = parsed[0]; 1411da177e4SLinus Torvalds mode = parsed[1]; 1421da177e4SLinus Torvalds uid = parsed[2]; 1431da177e4SLinus Torvalds gid = parsed[3]; 1441da177e4SLinus Torvalds nlink = parsed[4]; 145889d51a1SNye Liu mtime = parsed[5]; 1461da177e4SLinus Torvalds body_len = parsed[6]; 1471da177e4SLinus Torvalds major = parsed[7]; 1481da177e4SLinus Torvalds minor = parsed[8]; 1491da177e4SLinus Torvalds rdev = new_encode_dev(MKDEV(parsed[9], parsed[10])); 1501da177e4SLinus Torvalds name_len = parsed[11]; 1511da177e4SLinus Torvalds } 1521da177e4SLinus Torvalds 1531da177e4SLinus Torvalds /* FSM */ 1541da177e4SLinus Torvalds 1551da177e4SLinus Torvalds static __initdata enum state { 1561da177e4SLinus Torvalds Start, 1571da177e4SLinus Torvalds Collect, 1581da177e4SLinus Torvalds GotHeader, 1591da177e4SLinus Torvalds SkipIt, 1601da177e4SLinus Torvalds GotName, 1611da177e4SLinus Torvalds CopyFile, 1621da177e4SLinus Torvalds GotSymlink, 1631da177e4SLinus Torvalds Reset 1641da177e4SLinus Torvalds } state, next_state; 1651da177e4SLinus Torvalds 1661da177e4SLinus Torvalds static __initdata char *victim; 1671da177e4SLinus Torvalds static __initdata unsigned count; 1681da177e4SLinus Torvalds static __initdata loff_t this_header, next_header; 1691da177e4SLinus Torvalds 170b0a5ab93SAl Viro static inline void __init eat(unsigned n) 1711da177e4SLinus Torvalds { 1721da177e4SLinus Torvalds victim += n; 1731da177e4SLinus Torvalds this_header += n; 1741da177e4SLinus Torvalds count -= n; 1751da177e4SLinus Torvalds } 1761da177e4SLinus Torvalds 177889d51a1SNye Liu static __initdata char *vcollected; 1781da177e4SLinus Torvalds static __initdata char *collected; 1791da177e4SLinus Torvalds static __initdata int remains; 1801da177e4SLinus Torvalds static __initdata char *collect; 1811da177e4SLinus Torvalds 1821da177e4SLinus Torvalds static void __init read_into(char *buf, unsigned size, enum state next) 1831da177e4SLinus Torvalds { 1841da177e4SLinus Torvalds if (count >= size) { 1851da177e4SLinus Torvalds collected = victim; 1861da177e4SLinus Torvalds eat(size); 1871da177e4SLinus Torvalds state = next; 1881da177e4SLinus Torvalds } else { 1891da177e4SLinus Torvalds collect = collected = buf; 1901da177e4SLinus Torvalds remains = size; 1911da177e4SLinus Torvalds next_state = next; 1921da177e4SLinus Torvalds state = Collect; 1931da177e4SLinus Torvalds } 1941da177e4SLinus Torvalds } 1951da177e4SLinus Torvalds 1961da177e4SLinus Torvalds static __initdata char *header_buf, *symlink_buf, *name_buf; 1971da177e4SLinus Torvalds 1981da177e4SLinus Torvalds static int __init do_start(void) 1991da177e4SLinus Torvalds { 2001da177e4SLinus Torvalds read_into(header_buf, 110, GotHeader); 2011da177e4SLinus Torvalds return 0; 2021da177e4SLinus Torvalds } 2031da177e4SLinus Torvalds 2041da177e4SLinus Torvalds static int __init do_collect(void) 2051da177e4SLinus Torvalds { 2061da177e4SLinus Torvalds unsigned n = remains; 2071da177e4SLinus Torvalds if (count < n) 2081da177e4SLinus Torvalds n = count; 2091da177e4SLinus Torvalds memcpy(collect, victim, n); 2101da177e4SLinus Torvalds eat(n); 2111da177e4SLinus Torvalds collect += n; 2121da177e4SLinus Torvalds if ((remains -= n) != 0) 2131da177e4SLinus Torvalds return 1; 2141da177e4SLinus Torvalds state = next_state; 2151da177e4SLinus Torvalds return 0; 2161da177e4SLinus Torvalds } 2171da177e4SLinus Torvalds 2181da177e4SLinus Torvalds static int __init do_header(void) 2191da177e4SLinus Torvalds { 2202e591bbcSArjan van de Ven if (memcmp(collected, "070707", 6)==0) { 2212e591bbcSArjan van de Ven error("incorrect cpio method used: use -H newc option"); 2222e591bbcSArjan van de Ven return 1; 2232e591bbcSArjan van de Ven } 2241da177e4SLinus Torvalds if (memcmp(collected, "070701", 6)) { 2251da177e4SLinus Torvalds error("no cpio magic"); 2261da177e4SLinus Torvalds return 1; 2271da177e4SLinus Torvalds } 2281da177e4SLinus Torvalds parse_header(collected); 2291da177e4SLinus Torvalds next_header = this_header + N_ALIGN(name_len) + body_len; 2301da177e4SLinus Torvalds next_header = (next_header + 3) & ~3; 2311da177e4SLinus Torvalds state = SkipIt; 2321da177e4SLinus Torvalds if (name_len <= 0 || name_len > PATH_MAX) 2331da177e4SLinus Torvalds return 0; 2341da177e4SLinus Torvalds if (S_ISLNK(mode)) { 2351da177e4SLinus Torvalds if (body_len > PATH_MAX) 2361da177e4SLinus Torvalds return 0; 2371da177e4SLinus Torvalds collect = collected = symlink_buf; 2381da177e4SLinus Torvalds remains = N_ALIGN(name_len) + body_len; 2391da177e4SLinus Torvalds next_state = GotSymlink; 2401da177e4SLinus Torvalds state = Collect; 2411da177e4SLinus Torvalds return 0; 2421da177e4SLinus Torvalds } 2431da177e4SLinus Torvalds if (S_ISREG(mode) || !body_len) 2441da177e4SLinus Torvalds read_into(name_buf, N_ALIGN(name_len), GotName); 2451da177e4SLinus Torvalds return 0; 2461da177e4SLinus Torvalds } 2471da177e4SLinus Torvalds 2481da177e4SLinus Torvalds static int __init do_skip(void) 2491da177e4SLinus Torvalds { 2501da177e4SLinus Torvalds if (this_header + count < next_header) { 2511da177e4SLinus Torvalds eat(count); 2521da177e4SLinus Torvalds return 1; 2531da177e4SLinus Torvalds } else { 2541da177e4SLinus Torvalds eat(next_header - this_header); 2551da177e4SLinus Torvalds state = next_state; 2561da177e4SLinus Torvalds return 0; 2571da177e4SLinus Torvalds } 2581da177e4SLinus Torvalds } 2591da177e4SLinus Torvalds 2601da177e4SLinus Torvalds static int __init do_reset(void) 2611da177e4SLinus Torvalds { 2621da177e4SLinus Torvalds while(count && *victim == '\0') 2631da177e4SLinus Torvalds eat(1); 2641da177e4SLinus Torvalds if (count && (this_header & 3)) 2651da177e4SLinus Torvalds error("broken padding"); 2661da177e4SLinus Torvalds return 1; 2671da177e4SLinus Torvalds } 2681da177e4SLinus Torvalds 2691da177e4SLinus Torvalds static int __init maybe_link(void) 2701da177e4SLinus Torvalds { 2711da177e4SLinus Torvalds if (nlink >= 2) { 2722139a7fbSH. Peter Anvin char *old = find_link(major, minor, ino, mode, collected); 2731da177e4SLinus Torvalds if (old) 2741da177e4SLinus Torvalds return (sys_link(old, collected) < 0) ? -1 : 1; 2751da177e4SLinus Torvalds } 2761da177e4SLinus Torvalds return 0; 2771da177e4SLinus Torvalds } 2781da177e4SLinus Torvalds 279*685dd2d5SAl Viro static void __init clean_path(char *path, umode_t mode) 2802139a7fbSH. Peter Anvin { 2812139a7fbSH. Peter Anvin struct stat st; 2822139a7fbSH. Peter Anvin 2832139a7fbSH. Peter Anvin if (!sys_newlstat(path, &st) && (st.st_mode^mode) & S_IFMT) { 2842139a7fbSH. Peter Anvin if (S_ISDIR(st.st_mode)) 2852139a7fbSH. Peter Anvin sys_rmdir(path); 2862139a7fbSH. Peter Anvin else 2872139a7fbSH. Peter Anvin sys_unlink(path); 2882139a7fbSH. Peter Anvin } 2892139a7fbSH. Peter Anvin } 2902139a7fbSH. Peter Anvin 2911da177e4SLinus Torvalds static __initdata int wfd; 2921da177e4SLinus Torvalds 2931da177e4SLinus Torvalds static int __init do_name(void) 2941da177e4SLinus Torvalds { 2951da177e4SLinus Torvalds state = SkipIt; 2961da177e4SLinus Torvalds next_state = Reset; 2971da177e4SLinus Torvalds if (strcmp(collected, "TRAILER!!!") == 0) { 2981da177e4SLinus Torvalds free_hash(); 2991da177e4SLinus Torvalds return 0; 3001da177e4SLinus Torvalds } 3012139a7fbSH. Peter Anvin clean_path(collected, mode); 3021da177e4SLinus Torvalds if (S_ISREG(mode)) { 3032139a7fbSH. Peter Anvin int ml = maybe_link(); 3042139a7fbSH. Peter Anvin if (ml >= 0) { 3052139a7fbSH. Peter Anvin int openflags = O_WRONLY|O_CREAT; 3062139a7fbSH. Peter Anvin if (ml != 1) 3072139a7fbSH. Peter Anvin openflags |= O_TRUNC; 3082139a7fbSH. Peter Anvin wfd = sys_open(collected, openflags, mode); 3092139a7fbSH. Peter Anvin 3101da177e4SLinus Torvalds if (wfd >= 0) { 3111da177e4SLinus Torvalds sys_fchown(wfd, uid, gid); 3121da177e4SLinus Torvalds sys_fchmod(wfd, mode); 313d20d5a74SRandy Robertson if (body_len) 314cb6ff208SDavid Howells sys_ftruncate(wfd, body_len); 315889d51a1SNye Liu vcollected = kstrdup(collected, GFP_KERNEL); 3161da177e4SLinus Torvalds state = CopyFile; 3171da177e4SLinus Torvalds } 3181da177e4SLinus Torvalds } 3191da177e4SLinus Torvalds } else if (S_ISDIR(mode)) { 3201da177e4SLinus Torvalds sys_mkdir(collected, mode); 3211da177e4SLinus Torvalds sys_chown(collected, uid, gid); 3221da177e4SLinus Torvalds sys_chmod(collected, mode); 323889d51a1SNye Liu dir_add(collected, mtime); 3241da177e4SLinus Torvalds } else if (S_ISBLK(mode) || S_ISCHR(mode) || 3251da177e4SLinus Torvalds S_ISFIFO(mode) || S_ISSOCK(mode)) { 3261da177e4SLinus Torvalds if (maybe_link() == 0) { 3271da177e4SLinus Torvalds sys_mknod(collected, mode, rdev); 3281da177e4SLinus Torvalds sys_chown(collected, uid, gid); 3291da177e4SLinus Torvalds sys_chmod(collected, mode); 330889d51a1SNye Liu do_utime(collected, mtime); 3311da177e4SLinus Torvalds } 3321da177e4SLinus Torvalds } 3331da177e4SLinus Torvalds return 0; 3341da177e4SLinus Torvalds } 3351da177e4SLinus Torvalds 3361da177e4SLinus Torvalds static int __init do_copy(void) 3371da177e4SLinus Torvalds { 3381da177e4SLinus Torvalds if (count >= body_len) { 3391da177e4SLinus Torvalds sys_write(wfd, victim, body_len); 3401da177e4SLinus Torvalds sys_close(wfd); 341889d51a1SNye Liu do_utime(vcollected, mtime); 342889d51a1SNye Liu kfree(vcollected); 3431da177e4SLinus Torvalds eat(body_len); 3441da177e4SLinus Torvalds state = SkipIt; 3451da177e4SLinus Torvalds return 0; 3461da177e4SLinus Torvalds } else { 3471da177e4SLinus Torvalds sys_write(wfd, victim, count); 3481da177e4SLinus Torvalds body_len -= count; 3491da177e4SLinus Torvalds eat(count); 3501da177e4SLinus Torvalds return 1; 3511da177e4SLinus Torvalds } 3521da177e4SLinus Torvalds } 3531da177e4SLinus Torvalds 3541da177e4SLinus Torvalds static int __init do_symlink(void) 3551da177e4SLinus Torvalds { 3561da177e4SLinus Torvalds collected[N_ALIGN(name_len) + body_len] = '\0'; 3572139a7fbSH. Peter Anvin clean_path(collected, 0); 3581da177e4SLinus Torvalds sys_symlink(collected + N_ALIGN(name_len), collected); 3591da177e4SLinus Torvalds sys_lchown(collected, uid, gid); 360889d51a1SNye Liu do_utime(collected, mtime); 3611da177e4SLinus Torvalds state = SkipIt; 3621da177e4SLinus Torvalds next_state = Reset; 3631da177e4SLinus Torvalds return 0; 3641da177e4SLinus Torvalds } 3651da177e4SLinus Torvalds 3661da177e4SLinus Torvalds static __initdata int (*actions[])(void) = { 3671da177e4SLinus Torvalds [Start] = do_start, 3681da177e4SLinus Torvalds [Collect] = do_collect, 3691da177e4SLinus Torvalds [GotHeader] = do_header, 3701da177e4SLinus Torvalds [SkipIt] = do_skip, 3711da177e4SLinus Torvalds [GotName] = do_name, 3721da177e4SLinus Torvalds [CopyFile] = do_copy, 3731da177e4SLinus Torvalds [GotSymlink] = do_symlink, 3741da177e4SLinus Torvalds [Reset] = do_reset, 3751da177e4SLinus Torvalds }; 3761da177e4SLinus Torvalds 3771da177e4SLinus Torvalds static int __init write_buffer(char *buf, unsigned len) 3781da177e4SLinus Torvalds { 3791da177e4SLinus Torvalds count = len; 3801da177e4SLinus Torvalds victim = buf; 3811da177e4SLinus Torvalds 3821da177e4SLinus Torvalds while (!actions[state]()) 3831da177e4SLinus Torvalds ; 3841da177e4SLinus Torvalds return len - count; 3851da177e4SLinus Torvalds } 3861da177e4SLinus Torvalds 38730d65dbfSAlain Knaff static int __init flush_buffer(void *bufv, unsigned len) 3881da177e4SLinus Torvalds { 38930d65dbfSAlain Knaff char *buf = (char *) bufv; 3901da177e4SLinus Torvalds int written; 39130d65dbfSAlain Knaff int origLen = len; 3921da177e4SLinus Torvalds if (message) 39330d65dbfSAlain Knaff return -1; 3941da177e4SLinus Torvalds while ((written = write_buffer(buf, len)) < len && !message) { 3951da177e4SLinus Torvalds char c = buf[written]; 3961da177e4SLinus Torvalds if (c == '0') { 3971da177e4SLinus Torvalds buf += written; 3981da177e4SLinus Torvalds len -= written; 3991da177e4SLinus Torvalds state = Start; 4001da177e4SLinus Torvalds } else if (c == 0) { 4011da177e4SLinus Torvalds buf += written; 4021da177e4SLinus Torvalds len -= written; 4031da177e4SLinus Torvalds state = Reset; 4041da177e4SLinus Torvalds } else 4051da177e4SLinus Torvalds error("junk in compressed archive"); 4061da177e4SLinus Torvalds } 40730d65dbfSAlain Knaff return origLen; 4081da177e4SLinus Torvalds } 4091da177e4SLinus Torvalds 41030d65dbfSAlain Knaff static unsigned my_inptr; /* index of next byte to be processed in inbuf */ 4111da177e4SLinus Torvalds 412889c92d2SH. Peter Anvin #include <linux/decompress/generic.h> 4131da177e4SLinus Torvalds 414df52092fSLi, Shaohua static char * __init unpack_to_rootfs(char *buf, unsigned len) 4151da177e4SLinus Torvalds { 41654291362SPhillip Lougher int written, res; 417889c92d2SH. Peter Anvin decompress_fn decompress; 41823a22d57SH. Peter Anvin const char *compress_name; 41923a22d57SH. Peter Anvin static __initdata char msg_buf[64]; 420889c92d2SH. Peter Anvin 4213265e66bSThomas Petazzoni header_buf = kmalloc(110, GFP_KERNEL); 4223265e66bSThomas Petazzoni symlink_buf = kmalloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1, GFP_KERNEL); 4233265e66bSThomas Petazzoni name_buf = kmalloc(N_ALIGN(PATH_MAX), GFP_KERNEL); 42430d65dbfSAlain Knaff 42530d65dbfSAlain Knaff if (!header_buf || !symlink_buf || !name_buf) 4261da177e4SLinus Torvalds panic("can't allocate buffers"); 42730d65dbfSAlain Knaff 4281da177e4SLinus Torvalds state = Start; 4291da177e4SLinus Torvalds this_header = 0; 4301da177e4SLinus Torvalds message = NULL; 4311da177e4SLinus Torvalds while (!message && len) { 4321da177e4SLinus Torvalds loff_t saved_offset = this_header; 4331da177e4SLinus Torvalds if (*buf == '0' && !(this_header & 3)) { 4341da177e4SLinus Torvalds state = Start; 4351da177e4SLinus Torvalds written = write_buffer(buf, len); 4361da177e4SLinus Torvalds buf += written; 4371da177e4SLinus Torvalds len -= written; 4381da177e4SLinus Torvalds continue; 4391da177e4SLinus Torvalds } 4401da177e4SLinus Torvalds if (!*buf) { 4411da177e4SLinus Torvalds buf++; 4421da177e4SLinus Torvalds len--; 4431da177e4SLinus Torvalds this_header++; 4441da177e4SLinus Torvalds continue; 4451da177e4SLinus Torvalds } 4461da177e4SLinus Torvalds this_header = 0; 44723a22d57SH. Peter Anvin decompress = decompress_method(buf, len, &compress_name); 44854291362SPhillip Lougher if (decompress) { 44954291362SPhillip Lougher res = decompress(buf, len, NULL, flush_buffer, NULL, 450889c92d2SH. Peter Anvin &my_inptr, error); 45154291362SPhillip Lougher if (res) 45254291362SPhillip Lougher error("decompressor failed"); 45354291362SPhillip Lougher } else if (compress_name) { 45423a22d57SH. Peter Anvin if (!message) { 45523a22d57SH. Peter Anvin snprintf(msg_buf, sizeof msg_buf, 45623a22d57SH. Peter Anvin "compression method %s not configured", 45723a22d57SH. Peter Anvin compress_name); 45823a22d57SH. Peter Anvin message = msg_buf; 45923a22d57SH. Peter Anvin } 460df37bd15SPhillip Lougher } else 461df37bd15SPhillip Lougher error("junk in compressed archive"); 4621da177e4SLinus Torvalds if (state != Reset) 46330d65dbfSAlain Knaff error("junk in compressed archive"); 46430d65dbfSAlain Knaff this_header = saved_offset + my_inptr; 46530d65dbfSAlain Knaff buf += my_inptr; 46630d65dbfSAlain Knaff len -= my_inptr; 4671da177e4SLinus Torvalds } 468889d51a1SNye Liu dir_utime(); 4693265e66bSThomas Petazzoni kfree(name_buf); 4703265e66bSThomas Petazzoni kfree(symlink_buf); 4713265e66bSThomas Petazzoni kfree(header_buf); 4721da177e4SLinus Torvalds return message; 4731da177e4SLinus Torvalds } 4741da177e4SLinus Torvalds 4750a7b35cbSMichael Neuling static int __initdata do_retain_initrd; 4760a7b35cbSMichael Neuling 4770a7b35cbSMichael Neuling static int __init retain_initrd_param(char *str) 4780a7b35cbSMichael Neuling { 4790a7b35cbSMichael Neuling if (*str) 4800a7b35cbSMichael Neuling return 0; 4810a7b35cbSMichael Neuling do_retain_initrd = 1; 4820a7b35cbSMichael Neuling return 1; 4830a7b35cbSMichael Neuling } 4840a7b35cbSMichael Neuling __setup("retain_initrd", retain_initrd_param); 4850a7b35cbSMichael Neuling 486ffe8018cSHendrik Brueckner extern char __initramfs_start[]; 487ffe8018cSHendrik Brueckner extern unsigned long __initramfs_size; 4881da177e4SLinus Torvalds #include <linux/initrd.h> 4899c15e852SHaren Myneni #include <linux/kexec.h> 4900f3d2bd5SJan Beulich 4910f3d2bd5SJan Beulich static void __init free_initrd(void) 4920f3d2bd5SJan Beulich { 4939c15e852SHaren Myneni #ifdef CONFIG_KEXEC 4949c15e852SHaren Myneni unsigned long crashk_start = (unsigned long)__va(crashk_res.start); 4959c15e852SHaren Myneni unsigned long crashk_end = (unsigned long)__va(crashk_res.end); 4960a7b35cbSMichael Neuling #endif 4970a7b35cbSMichael Neuling if (do_retain_initrd) 4980a7b35cbSMichael Neuling goto skip; 4999c15e852SHaren Myneni 5000a7b35cbSMichael Neuling #ifdef CONFIG_KEXEC 5019c15e852SHaren Myneni /* 5029c15e852SHaren Myneni * If the initrd region is overlapped with crashkernel reserved region, 5039c15e852SHaren Myneni * free only memory that is not part of crashkernel region. 5049c15e852SHaren Myneni */ 5059c15e852SHaren Myneni if (initrd_start < crashk_end && initrd_end > crashk_start) { 5069c15e852SHaren Myneni /* 5079c15e852SHaren Myneni * Initialize initrd memory region since the kexec boot does 5089c15e852SHaren Myneni * not do. 5099c15e852SHaren Myneni */ 5109c15e852SHaren Myneni memset((void *)initrd_start, 0, initrd_end - initrd_start); 5119c15e852SHaren Myneni if (initrd_start < crashk_start) 5129c15e852SHaren Myneni free_initrd_mem(initrd_start, crashk_start); 5139c15e852SHaren Myneni if (initrd_end > crashk_end) 5149c15e852SHaren Myneni free_initrd_mem(crashk_end, initrd_end); 5159c15e852SHaren Myneni } else 5169c15e852SHaren Myneni #endif 5170f3d2bd5SJan Beulich free_initrd_mem(initrd_start, initrd_end); 5180a7b35cbSMichael Neuling skip: 5190f3d2bd5SJan Beulich initrd_start = 0; 5200f3d2bd5SJan Beulich initrd_end = 0; 5210f3d2bd5SJan Beulich } 5220f3d2bd5SJan Beulich 523b52bb371SNikanth Karthikesan #ifdef CONFIG_BLK_DEV_RAM 524df52092fSLi, Shaohua #define BUF_SIZE 1024 525df52092fSLi, Shaohua static void __init clean_rootfs(void) 526df52092fSLi, Shaohua { 527df52092fSLi, Shaohua int fd; 528df52092fSLi, Shaohua void *buf; 529df52092fSLi, Shaohua struct linux_dirent64 *dirp; 5308aaed5beSH Hartley Sweeten int num; 531df52092fSLi, Shaohua 532562f5e63SNamhyung Kim fd = sys_open((const char __user __force *) "/", O_RDONLY, 0); 533df52092fSLi, Shaohua WARN_ON(fd < 0); 534df52092fSLi, Shaohua if (fd < 0) 535df52092fSLi, Shaohua return; 536df52092fSLi, Shaohua buf = kzalloc(BUF_SIZE, GFP_KERNEL); 537df52092fSLi, Shaohua WARN_ON(!buf); 538df52092fSLi, Shaohua if (!buf) { 539df52092fSLi, Shaohua sys_close(fd); 540df52092fSLi, Shaohua return; 541df52092fSLi, Shaohua } 542df52092fSLi, Shaohua 543df52092fSLi, Shaohua dirp = buf; 5448aaed5beSH Hartley Sweeten num = sys_getdents64(fd, dirp, BUF_SIZE); 5458aaed5beSH Hartley Sweeten while (num > 0) { 5468aaed5beSH Hartley Sweeten while (num > 0) { 547df52092fSLi, Shaohua struct stat st; 548df52092fSLi, Shaohua int ret; 549df52092fSLi, Shaohua 550df52092fSLi, Shaohua ret = sys_newlstat(dirp->d_name, &st); 551df52092fSLi, Shaohua WARN_ON_ONCE(ret); 552df52092fSLi, Shaohua if (!ret) { 553df52092fSLi, Shaohua if (S_ISDIR(st.st_mode)) 554df52092fSLi, Shaohua sys_rmdir(dirp->d_name); 555df52092fSLi, Shaohua else 556df52092fSLi, Shaohua sys_unlink(dirp->d_name); 557df52092fSLi, Shaohua } 558df52092fSLi, Shaohua 5598aaed5beSH Hartley Sweeten num -= dirp->d_reclen; 560df52092fSLi, Shaohua dirp = (void *)dirp + dirp->d_reclen; 561df52092fSLi, Shaohua } 562df52092fSLi, Shaohua dirp = buf; 563df52092fSLi, Shaohua memset(buf, 0, BUF_SIZE); 5648aaed5beSH Hartley Sweeten num = sys_getdents64(fd, dirp, BUF_SIZE); 565df52092fSLi, Shaohua } 566df52092fSLi, Shaohua 567df52092fSLi, Shaohua sys_close(fd); 568df52092fSLi, Shaohua kfree(buf); 569df52092fSLi, Shaohua } 570b52bb371SNikanth Karthikesan #endif 571df52092fSLi, Shaohua 5729a9e0d68SLinus Torvalds static int __init populate_rootfs(void) 5731da177e4SLinus Torvalds { 574ffe8018cSHendrik Brueckner char *err = unpack_to_rootfs(__initramfs_start, __initramfs_size); 5751da177e4SLinus Torvalds if (err) 57673310a16SH. Peter Anvin panic(err); /* Failed to decompress INTERNAL initramfs */ 5771da177e4SLinus Torvalds if (initrd_start) { 578340e48e6SZdenek Pavlas #ifdef CONFIG_BLK_DEV_RAM 5791da177e4SLinus Torvalds int fd; 580a1e6b6c1SEric Piel printk(KERN_INFO "Trying to unpack rootfs image as initramfs...\n"); 5811da177e4SLinus Torvalds err = unpack_to_rootfs((char *)initrd_start, 582df52092fSLi, Shaohua initrd_end - initrd_start); 5831da177e4SLinus Torvalds if (!err) { 5840f3d2bd5SJan Beulich free_initrd(); 5858d610dd5SLinus Torvalds return 0; 586df52092fSLi, Shaohua } else { 587df52092fSLi, Shaohua clean_rootfs(); 588ffe8018cSHendrik Brueckner unpack_to_rootfs(__initramfs_start, __initramfs_size); 5891da177e4SLinus Torvalds } 590c1c490e0SSimon Kitching printk(KERN_INFO "rootfs image is not initramfs (%s)" 591c1c490e0SSimon Kitching "; looks like an initrd\n", err); 592562f5e63SNamhyung Kim fd = sys_open((const char __user __force *) "/initrd.image", 593562f5e63SNamhyung Kim O_WRONLY|O_CREAT, 0700); 5941da177e4SLinus Torvalds if (fd >= 0) { 5951da177e4SLinus Torvalds sys_write(fd, (char *)initrd_start, 5961da177e4SLinus Torvalds initrd_end - initrd_start); 5971da177e4SLinus Torvalds sys_close(fd); 5980f3d2bd5SJan Beulich free_initrd(); 5991da177e4SLinus Torvalds } 600340e48e6SZdenek Pavlas #else 601a1e6b6c1SEric Piel printk(KERN_INFO "Unpacking initramfs...\n"); 602340e48e6SZdenek Pavlas err = unpack_to_rootfs((char *)initrd_start, 603df52092fSLi, Shaohua initrd_end - initrd_start); 604a1e6b6c1SEric Piel if (err) 605a1e6b6c1SEric Piel printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err); 606340e48e6SZdenek Pavlas free_initrd(); 607340e48e6SZdenek Pavlas #endif 6081da177e4SLinus Torvalds } 6098d610dd5SLinus Torvalds return 0; 6101da177e4SLinus Torvalds } 6118d610dd5SLinus Torvalds rootfs_initcall(populate_rootfs); 612