1c67e5382SH Hartley Sweeten /* 2c67e5382SH Hartley Sweeten * Many of the syscalls used in this file expect some of the arguments 3c67e5382SH Hartley Sweeten * to be __user pointers not __kernel pointers. To limit the sparse 4c67e5382SH Hartley Sweeten * noise, turn off sparse checking for this file. 5c67e5382SH Hartley Sweeten */ 6c67e5382SH Hartley Sweeten #ifdef __CHECKER__ 7c67e5382SH Hartley Sweeten #undef __CHECKER__ 8c67e5382SH Hartley Sweeten #warning "Sparse checking disabled for this file" 9c67e5382SH Hartley Sweeten #endif 10c67e5382SH Hartley Sweeten 111da177e4SLinus Torvalds #include <linux/init.h> 121da177e4SLinus Torvalds #include <linux/fs.h> 131da177e4SLinus Torvalds #include <linux/slab.h> 141da177e4SLinus Torvalds #include <linux/types.h> 151da177e4SLinus Torvalds #include <linux/fcntl.h> 161da177e4SLinus Torvalds #include <linux/delay.h> 171da177e4SLinus Torvalds #include <linux/string.h> 18df52092fSLi, Shaohua #include <linux/dirent.h> 191da177e4SLinus Torvalds #include <linux/syscalls.h> 20889d51a1SNye Liu #include <linux/utime.h> 211da177e4SLinus Torvalds 2238747439SYinghai Lu static ssize_t __init xwrite(int fd, const char *p, size_t count) 2338747439SYinghai Lu { 2438747439SYinghai Lu ssize_t out = 0; 2538747439SYinghai Lu 2638747439SYinghai Lu /* sys_write only can write MAX_RW_COUNT aka 2G-4K bytes at most */ 2738747439SYinghai Lu while (count) { 2838747439SYinghai Lu ssize_t rv = sys_write(fd, p, count); 2938747439SYinghai Lu 3038747439SYinghai Lu if (rv < 0) { 3138747439SYinghai Lu if (rv == -EINTR || rv == -EAGAIN) 3238747439SYinghai Lu continue; 3338747439SYinghai Lu return out ? out : rv; 3438747439SYinghai Lu } else if (rv == 0) 3538747439SYinghai Lu break; 3638747439SYinghai Lu 3738747439SYinghai Lu p += rv; 3838747439SYinghai Lu out += rv; 3938747439SYinghai Lu count -= rv; 4038747439SYinghai Lu } 4138747439SYinghai Lu 4238747439SYinghai Lu return out; 4338747439SYinghai Lu } 4438747439SYinghai Lu 451da177e4SLinus Torvalds static __initdata char *message; 461da177e4SLinus Torvalds static void __init error(char *x) 471da177e4SLinus Torvalds { 481da177e4SLinus Torvalds if (!message) 491da177e4SLinus Torvalds message = x; 501da177e4SLinus Torvalds } 511da177e4SLinus Torvalds 521da177e4SLinus Torvalds /* link hash */ 531da177e4SLinus Torvalds 546a050da4SMark Huang #define N_ALIGN(len) ((((len) + 1) & ~3) + 2) 556a050da4SMark Huang 561da177e4SLinus Torvalds static __initdata struct hash { 571da177e4SLinus Torvalds int ino, minor, major; 58685dd2d5SAl Viro umode_t mode; 591da177e4SLinus Torvalds struct hash *next; 606a050da4SMark Huang char name[N_ALIGN(PATH_MAX)]; 611da177e4SLinus Torvalds } *head[32]; 621da177e4SLinus Torvalds 631da177e4SLinus Torvalds static inline int hash(int major, int minor, int ino) 641da177e4SLinus Torvalds { 651da177e4SLinus Torvalds unsigned long tmp = ino + minor + (major << 3); 661da177e4SLinus Torvalds tmp += tmp >> 5; 671da177e4SLinus Torvalds return tmp & 31; 681da177e4SLinus Torvalds } 691da177e4SLinus Torvalds 702139a7fbSH. Peter Anvin static char __init *find_link(int major, int minor, int ino, 71685dd2d5SAl Viro umode_t mode, char *name) 721da177e4SLinus Torvalds { 731da177e4SLinus Torvalds struct hash **p, *q; 741da177e4SLinus Torvalds for (p = head + hash(major, minor, ino); *p; p = &(*p)->next) { 751da177e4SLinus Torvalds if ((*p)->ino != ino) 761da177e4SLinus Torvalds continue; 771da177e4SLinus Torvalds if ((*p)->minor != minor) 781da177e4SLinus Torvalds continue; 791da177e4SLinus Torvalds if ((*p)->major != major) 801da177e4SLinus Torvalds continue; 812139a7fbSH. Peter Anvin if (((*p)->mode ^ mode) & S_IFMT) 822139a7fbSH. Peter Anvin continue; 831da177e4SLinus Torvalds return (*p)->name; 841da177e4SLinus Torvalds } 853265e66bSThomas Petazzoni q = kmalloc(sizeof(struct hash), GFP_KERNEL); 861da177e4SLinus Torvalds if (!q) 871da177e4SLinus Torvalds panic("can't allocate link hash entry"); 881da177e4SLinus Torvalds q->major = major; 892139a7fbSH. Peter Anvin q->minor = minor; 902139a7fbSH. Peter Anvin q->ino = ino; 912139a7fbSH. Peter Anvin q->mode = mode; 926a050da4SMark Huang strcpy(q->name, name); 931da177e4SLinus Torvalds q->next = NULL; 941da177e4SLinus Torvalds *p = q; 951da177e4SLinus Torvalds return NULL; 961da177e4SLinus Torvalds } 971da177e4SLinus Torvalds 981da177e4SLinus Torvalds static void __init free_hash(void) 991da177e4SLinus Torvalds { 1001da177e4SLinus Torvalds struct hash **p, *q; 1011da177e4SLinus Torvalds for (p = head; p < head + 32; p++) { 1021da177e4SLinus Torvalds while (*p) { 1031da177e4SLinus Torvalds q = *p; 1041da177e4SLinus Torvalds *p = q->next; 1053265e66bSThomas Petazzoni kfree(q); 1061da177e4SLinus Torvalds } 1071da177e4SLinus Torvalds } 1081da177e4SLinus Torvalds } 1091da177e4SLinus Torvalds 110c67e5382SH Hartley Sweeten static long __init do_utime(char *filename, time_t mtime) 111889d51a1SNye Liu { 112889d51a1SNye Liu struct timespec t[2]; 113889d51a1SNye Liu 114889d51a1SNye Liu t[0].tv_sec = mtime; 115889d51a1SNye Liu t[0].tv_nsec = 0; 116889d51a1SNye Liu t[1].tv_sec = mtime; 117889d51a1SNye Liu t[1].tv_nsec = 0; 118889d51a1SNye Liu 119889d51a1SNye Liu return do_utimes(AT_FDCWD, filename, t, AT_SYMLINK_NOFOLLOW); 120889d51a1SNye Liu } 121889d51a1SNye Liu 122889d51a1SNye Liu static __initdata LIST_HEAD(dir_list); 123889d51a1SNye Liu struct dir_entry { 124889d51a1SNye Liu struct list_head list; 125889d51a1SNye Liu char *name; 126889d51a1SNye Liu time_t mtime; 127889d51a1SNye Liu }; 128889d51a1SNye Liu 129889d51a1SNye Liu static void __init dir_add(const char *name, time_t mtime) 130889d51a1SNye Liu { 131889d51a1SNye Liu struct dir_entry *de = kmalloc(sizeof(struct dir_entry), GFP_KERNEL); 132889d51a1SNye Liu if (!de) 133889d51a1SNye Liu panic("can't allocate dir_entry buffer"); 134889d51a1SNye Liu INIT_LIST_HEAD(&de->list); 135889d51a1SNye Liu de->name = kstrdup(name, GFP_KERNEL); 136889d51a1SNye Liu de->mtime = mtime; 137889d51a1SNye Liu list_add(&de->list, &dir_list); 138889d51a1SNye Liu } 139889d51a1SNye Liu 140889d51a1SNye Liu static void __init dir_utime(void) 141889d51a1SNye Liu { 142889d51a1SNye Liu struct dir_entry *de, *tmp; 143889d51a1SNye Liu list_for_each_entry_safe(de, tmp, &dir_list, list) { 144889d51a1SNye Liu list_del(&de->list); 145889d51a1SNye Liu do_utime(de->name, de->mtime); 146889d51a1SNye Liu kfree(de->name); 147889d51a1SNye Liu kfree(de); 148889d51a1SNye Liu } 149889d51a1SNye Liu } 150889d51a1SNye Liu 151889d51a1SNye Liu static __initdata time_t mtime; 152889d51a1SNye Liu 1531da177e4SLinus Torvalds /* cpio header parsing */ 1541da177e4SLinus Torvalds 1551da177e4SLinus Torvalds static __initdata unsigned long ino, major, minor, nlink; 156685dd2d5SAl Viro static __initdata umode_t mode; 1571da177e4SLinus Torvalds static __initdata unsigned long body_len, name_len; 1581da177e4SLinus Torvalds static __initdata uid_t uid; 1591da177e4SLinus Torvalds static __initdata gid_t gid; 1601da177e4SLinus Torvalds static __initdata unsigned rdev; 1611da177e4SLinus Torvalds 1621da177e4SLinus Torvalds static void __init parse_header(char *s) 1631da177e4SLinus Torvalds { 1641da177e4SLinus Torvalds unsigned long parsed[12]; 1651da177e4SLinus Torvalds char buf[9]; 1661da177e4SLinus Torvalds int i; 1671da177e4SLinus Torvalds 1681da177e4SLinus Torvalds buf[8] = '\0'; 1691da177e4SLinus Torvalds for (i = 0, s += 6; i < 12; i++, s += 8) { 1701da177e4SLinus Torvalds memcpy(buf, s, 8); 1711da177e4SLinus Torvalds parsed[i] = simple_strtoul(buf, NULL, 16); 1721da177e4SLinus Torvalds } 1731da177e4SLinus Torvalds ino = parsed[0]; 1741da177e4SLinus Torvalds mode = parsed[1]; 1751da177e4SLinus Torvalds uid = parsed[2]; 1761da177e4SLinus Torvalds gid = parsed[3]; 1771da177e4SLinus Torvalds nlink = parsed[4]; 178889d51a1SNye Liu mtime = parsed[5]; 1791da177e4SLinus Torvalds body_len = parsed[6]; 1801da177e4SLinus Torvalds major = parsed[7]; 1811da177e4SLinus Torvalds minor = parsed[8]; 1821da177e4SLinus Torvalds rdev = new_encode_dev(MKDEV(parsed[9], parsed[10])); 1831da177e4SLinus Torvalds name_len = parsed[11]; 1841da177e4SLinus Torvalds } 1851da177e4SLinus Torvalds 1861da177e4SLinus Torvalds /* FSM */ 1871da177e4SLinus Torvalds 1881da177e4SLinus Torvalds static __initdata enum state { 1891da177e4SLinus Torvalds Start, 1901da177e4SLinus Torvalds Collect, 1911da177e4SLinus Torvalds GotHeader, 1921da177e4SLinus Torvalds SkipIt, 1931da177e4SLinus Torvalds GotName, 1941da177e4SLinus Torvalds CopyFile, 1951da177e4SLinus Torvalds GotSymlink, 1961da177e4SLinus Torvalds Reset 1971da177e4SLinus Torvalds } state, next_state; 1981da177e4SLinus Torvalds 1991da177e4SLinus Torvalds static __initdata char *victim; 200*c34d85acSMark Rustad static unsigned long byte_count __initdata; 2011da177e4SLinus Torvalds static __initdata loff_t this_header, next_header; 2021da177e4SLinus Torvalds 203b0a5ab93SAl Viro static inline void __init eat(unsigned n) 2041da177e4SLinus Torvalds { 2051da177e4SLinus Torvalds victim += n; 2061da177e4SLinus Torvalds this_header += n; 207*c34d85acSMark Rustad byte_count -= n; 2081da177e4SLinus Torvalds } 2091da177e4SLinus Torvalds 210889d51a1SNye Liu static __initdata char *vcollected; 2111da177e4SLinus Torvalds static __initdata char *collected; 212d97b07c5SYinghai Lu static long remains __initdata; 2131da177e4SLinus Torvalds static __initdata char *collect; 2141da177e4SLinus Torvalds 2151da177e4SLinus Torvalds static void __init read_into(char *buf, unsigned size, enum state next) 2161da177e4SLinus Torvalds { 217*c34d85acSMark Rustad if (byte_count >= size) { 2181da177e4SLinus Torvalds collected = victim; 2191da177e4SLinus Torvalds eat(size); 2201da177e4SLinus Torvalds state = next; 2211da177e4SLinus Torvalds } else { 2221da177e4SLinus Torvalds collect = collected = buf; 2231da177e4SLinus Torvalds remains = size; 2241da177e4SLinus Torvalds next_state = next; 2251da177e4SLinus Torvalds state = Collect; 2261da177e4SLinus Torvalds } 2271da177e4SLinus Torvalds } 2281da177e4SLinus Torvalds 2291da177e4SLinus Torvalds static __initdata char *header_buf, *symlink_buf, *name_buf; 2301da177e4SLinus Torvalds 2311da177e4SLinus Torvalds static int __init do_start(void) 2321da177e4SLinus Torvalds { 2331da177e4SLinus Torvalds read_into(header_buf, 110, GotHeader); 2341da177e4SLinus Torvalds return 0; 2351da177e4SLinus Torvalds } 2361da177e4SLinus Torvalds 2371da177e4SLinus Torvalds static int __init do_collect(void) 2381da177e4SLinus Torvalds { 239d97b07c5SYinghai Lu unsigned long n = remains; 240*c34d85acSMark Rustad if (byte_count < n) 241*c34d85acSMark Rustad n = byte_count; 2421da177e4SLinus Torvalds memcpy(collect, victim, n); 2431da177e4SLinus Torvalds eat(n); 2441da177e4SLinus Torvalds collect += n; 2451da177e4SLinus Torvalds if ((remains -= n) != 0) 2461da177e4SLinus Torvalds return 1; 2471da177e4SLinus Torvalds state = next_state; 2481da177e4SLinus Torvalds return 0; 2491da177e4SLinus Torvalds } 2501da177e4SLinus Torvalds 2511da177e4SLinus Torvalds static int __init do_header(void) 2521da177e4SLinus Torvalds { 2532e591bbcSArjan van de Ven if (memcmp(collected, "070707", 6)==0) { 2542e591bbcSArjan van de Ven error("incorrect cpio method used: use -H newc option"); 2552e591bbcSArjan van de Ven return 1; 2562e591bbcSArjan van de Ven } 2571da177e4SLinus Torvalds if (memcmp(collected, "070701", 6)) { 2581da177e4SLinus Torvalds error("no cpio magic"); 2591da177e4SLinus Torvalds return 1; 2601da177e4SLinus Torvalds } 2611da177e4SLinus Torvalds parse_header(collected); 2621da177e4SLinus Torvalds next_header = this_header + N_ALIGN(name_len) + body_len; 2631da177e4SLinus Torvalds next_header = (next_header + 3) & ~3; 2641da177e4SLinus Torvalds state = SkipIt; 2651da177e4SLinus Torvalds if (name_len <= 0 || name_len > PATH_MAX) 2661da177e4SLinus Torvalds return 0; 2671da177e4SLinus Torvalds if (S_ISLNK(mode)) { 2681da177e4SLinus Torvalds if (body_len > PATH_MAX) 2691da177e4SLinus Torvalds return 0; 2701da177e4SLinus Torvalds collect = collected = symlink_buf; 2711da177e4SLinus Torvalds remains = N_ALIGN(name_len) + body_len; 2721da177e4SLinus Torvalds next_state = GotSymlink; 2731da177e4SLinus Torvalds state = Collect; 2741da177e4SLinus Torvalds return 0; 2751da177e4SLinus Torvalds } 2761da177e4SLinus Torvalds if (S_ISREG(mode) || !body_len) 2771da177e4SLinus Torvalds read_into(name_buf, N_ALIGN(name_len), GotName); 2781da177e4SLinus Torvalds return 0; 2791da177e4SLinus Torvalds } 2801da177e4SLinus Torvalds 2811da177e4SLinus Torvalds static int __init do_skip(void) 2821da177e4SLinus Torvalds { 283*c34d85acSMark Rustad if (this_header + byte_count < next_header) { 284*c34d85acSMark Rustad eat(byte_count); 2851da177e4SLinus Torvalds return 1; 2861da177e4SLinus Torvalds } else { 2871da177e4SLinus Torvalds eat(next_header - this_header); 2881da177e4SLinus Torvalds state = next_state; 2891da177e4SLinus Torvalds return 0; 2901da177e4SLinus Torvalds } 2911da177e4SLinus Torvalds } 2921da177e4SLinus Torvalds 2931da177e4SLinus Torvalds static int __init do_reset(void) 2941da177e4SLinus Torvalds { 295*c34d85acSMark Rustad while (byte_count && *victim == '\0') 2961da177e4SLinus Torvalds eat(1); 297*c34d85acSMark Rustad if (byte_count && (this_header & 3)) 2981da177e4SLinus Torvalds error("broken padding"); 2991da177e4SLinus Torvalds return 1; 3001da177e4SLinus Torvalds } 3011da177e4SLinus Torvalds 3021da177e4SLinus Torvalds static int __init maybe_link(void) 3031da177e4SLinus Torvalds { 3041da177e4SLinus Torvalds if (nlink >= 2) { 3052139a7fbSH. Peter Anvin char *old = find_link(major, minor, ino, mode, collected); 3061da177e4SLinus Torvalds if (old) 3071da177e4SLinus Torvalds return (sys_link(old, collected) < 0) ? -1 : 1; 3081da177e4SLinus Torvalds } 3091da177e4SLinus Torvalds return 0; 3101da177e4SLinus Torvalds } 3111da177e4SLinus Torvalds 312*c34d85acSMark Rustad static void __init clean_path(char *path, umode_t fmode) 3132139a7fbSH. Peter Anvin { 3142139a7fbSH. Peter Anvin struct stat st; 3152139a7fbSH. Peter Anvin 316*c34d85acSMark Rustad if (!sys_newlstat(path, &st) && (st.st_mode ^ fmode) & S_IFMT) { 3172139a7fbSH. Peter Anvin if (S_ISDIR(st.st_mode)) 3182139a7fbSH. Peter Anvin sys_rmdir(path); 3192139a7fbSH. Peter Anvin else 3202139a7fbSH. Peter Anvin sys_unlink(path); 3212139a7fbSH. Peter Anvin } 3222139a7fbSH. Peter Anvin } 3232139a7fbSH. Peter Anvin 3241da177e4SLinus Torvalds static __initdata int wfd; 3251da177e4SLinus Torvalds 3261da177e4SLinus Torvalds static int __init do_name(void) 3271da177e4SLinus Torvalds { 3281da177e4SLinus Torvalds state = SkipIt; 3291da177e4SLinus Torvalds next_state = Reset; 3301da177e4SLinus Torvalds if (strcmp(collected, "TRAILER!!!") == 0) { 3311da177e4SLinus Torvalds free_hash(); 3321da177e4SLinus Torvalds return 0; 3331da177e4SLinus Torvalds } 3342139a7fbSH. Peter Anvin clean_path(collected, mode); 3351da177e4SLinus Torvalds if (S_ISREG(mode)) { 3362139a7fbSH. Peter Anvin int ml = maybe_link(); 3372139a7fbSH. Peter Anvin if (ml >= 0) { 3382139a7fbSH. Peter Anvin int openflags = O_WRONLY|O_CREAT; 3392139a7fbSH. Peter Anvin if (ml != 1) 3402139a7fbSH. Peter Anvin openflags |= O_TRUNC; 3412139a7fbSH. Peter Anvin wfd = sys_open(collected, openflags, mode); 3422139a7fbSH. Peter Anvin 3431da177e4SLinus Torvalds if (wfd >= 0) { 3441da177e4SLinus Torvalds sys_fchown(wfd, uid, gid); 3451da177e4SLinus Torvalds sys_fchmod(wfd, mode); 346d20d5a74SRandy Robertson if (body_len) 347cb6ff208SDavid Howells sys_ftruncate(wfd, body_len); 348889d51a1SNye Liu vcollected = kstrdup(collected, GFP_KERNEL); 3491da177e4SLinus Torvalds state = CopyFile; 3501da177e4SLinus Torvalds } 3511da177e4SLinus Torvalds } 3521da177e4SLinus Torvalds } else if (S_ISDIR(mode)) { 3531da177e4SLinus Torvalds sys_mkdir(collected, mode); 3541da177e4SLinus Torvalds sys_chown(collected, uid, gid); 3551da177e4SLinus Torvalds sys_chmod(collected, mode); 356889d51a1SNye Liu dir_add(collected, mtime); 3571da177e4SLinus Torvalds } else if (S_ISBLK(mode) || S_ISCHR(mode) || 3581da177e4SLinus Torvalds S_ISFIFO(mode) || S_ISSOCK(mode)) { 3591da177e4SLinus Torvalds if (maybe_link() == 0) { 3601da177e4SLinus Torvalds sys_mknod(collected, mode, rdev); 3611da177e4SLinus Torvalds sys_chown(collected, uid, gid); 3621da177e4SLinus Torvalds sys_chmod(collected, mode); 363889d51a1SNye Liu do_utime(collected, mtime); 3641da177e4SLinus Torvalds } 3651da177e4SLinus Torvalds } 3661da177e4SLinus Torvalds return 0; 3671da177e4SLinus Torvalds } 3681da177e4SLinus Torvalds 3691da177e4SLinus Torvalds static int __init do_copy(void) 3701da177e4SLinus Torvalds { 371*c34d85acSMark Rustad if (byte_count >= body_len) { 3729687fd91SDavid Engraf if (xwrite(wfd, victim, body_len) != body_len) 3739687fd91SDavid Engraf error("write error"); 3741da177e4SLinus Torvalds sys_close(wfd); 375889d51a1SNye Liu do_utime(vcollected, mtime); 376889d51a1SNye Liu kfree(vcollected); 3771da177e4SLinus Torvalds eat(body_len); 3781da177e4SLinus Torvalds state = SkipIt; 3791da177e4SLinus Torvalds return 0; 3801da177e4SLinus Torvalds } else { 381*c34d85acSMark Rustad if (xwrite(wfd, victim, byte_count) != byte_count) 3829687fd91SDavid Engraf error("write error"); 383*c34d85acSMark Rustad body_len -= byte_count; 384*c34d85acSMark Rustad eat(byte_count); 3851da177e4SLinus Torvalds return 1; 3861da177e4SLinus Torvalds } 3871da177e4SLinus Torvalds } 3881da177e4SLinus Torvalds 3891da177e4SLinus Torvalds static int __init do_symlink(void) 3901da177e4SLinus Torvalds { 3911da177e4SLinus Torvalds collected[N_ALIGN(name_len) + body_len] = '\0'; 3922139a7fbSH. Peter Anvin clean_path(collected, 0); 3931da177e4SLinus Torvalds sys_symlink(collected + N_ALIGN(name_len), collected); 3941da177e4SLinus Torvalds sys_lchown(collected, uid, gid); 395889d51a1SNye Liu do_utime(collected, mtime); 3961da177e4SLinus Torvalds state = SkipIt; 3971da177e4SLinus Torvalds next_state = Reset; 3981da177e4SLinus Torvalds return 0; 3991da177e4SLinus Torvalds } 4001da177e4SLinus Torvalds 4011da177e4SLinus Torvalds static __initdata int (*actions[])(void) = { 4021da177e4SLinus Torvalds [Start] = do_start, 4031da177e4SLinus Torvalds [Collect] = do_collect, 4041da177e4SLinus Torvalds [GotHeader] = do_header, 4051da177e4SLinus Torvalds [SkipIt] = do_skip, 4061da177e4SLinus Torvalds [GotName] = do_name, 4071da177e4SLinus Torvalds [CopyFile] = do_copy, 4081da177e4SLinus Torvalds [GotSymlink] = do_symlink, 4091da177e4SLinus Torvalds [Reset] = do_reset, 4101da177e4SLinus Torvalds }; 4111da177e4SLinus Torvalds 412d97b07c5SYinghai Lu static long __init write_buffer(char *buf, unsigned long len) 4131da177e4SLinus Torvalds { 414*c34d85acSMark Rustad byte_count = len; 4151da177e4SLinus Torvalds victim = buf; 4161da177e4SLinus Torvalds 4171da177e4SLinus Torvalds while (!actions[state]()) 4181da177e4SLinus Torvalds ; 419*c34d85acSMark Rustad return len - byte_count; 4201da177e4SLinus Torvalds } 4211da177e4SLinus Torvalds 422d97b07c5SYinghai Lu static long __init flush_buffer(void *bufv, unsigned long len) 4231da177e4SLinus Torvalds { 42430d65dbfSAlain Knaff char *buf = (char *) bufv; 425d97b07c5SYinghai Lu long written; 426d97b07c5SYinghai Lu long origLen = len; 4271da177e4SLinus Torvalds if (message) 42830d65dbfSAlain Knaff return -1; 4291da177e4SLinus Torvalds while ((written = write_buffer(buf, len)) < len && !message) { 4301da177e4SLinus Torvalds char c = buf[written]; 4311da177e4SLinus Torvalds if (c == '0') { 4321da177e4SLinus Torvalds buf += written; 4331da177e4SLinus Torvalds len -= written; 4341da177e4SLinus Torvalds state = Start; 4351da177e4SLinus Torvalds } else if (c == 0) { 4361da177e4SLinus Torvalds buf += written; 4371da177e4SLinus Torvalds len -= written; 4381da177e4SLinus Torvalds state = Reset; 4391da177e4SLinus Torvalds } else 4401da177e4SLinus Torvalds error("junk in compressed archive"); 4411da177e4SLinus Torvalds } 44230d65dbfSAlain Knaff return origLen; 4431da177e4SLinus Torvalds } 4441da177e4SLinus Torvalds 445d97b07c5SYinghai Lu static unsigned long my_inptr; /* index of next byte to be processed in inbuf */ 4461da177e4SLinus Torvalds 447889c92d2SH. Peter Anvin #include <linux/decompress/generic.h> 4481da177e4SLinus Torvalds 449d97b07c5SYinghai Lu static char * __init unpack_to_rootfs(char *buf, unsigned long len) 4501da177e4SLinus Torvalds { 451d97b07c5SYinghai Lu long written; 452889c92d2SH. Peter Anvin decompress_fn decompress; 45323a22d57SH. Peter Anvin const char *compress_name; 45423a22d57SH. Peter Anvin static __initdata char msg_buf[64]; 455889c92d2SH. Peter Anvin 4563265e66bSThomas Petazzoni header_buf = kmalloc(110, GFP_KERNEL); 4573265e66bSThomas Petazzoni symlink_buf = kmalloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1, GFP_KERNEL); 4583265e66bSThomas Petazzoni name_buf = kmalloc(N_ALIGN(PATH_MAX), GFP_KERNEL); 45930d65dbfSAlain Knaff 46030d65dbfSAlain Knaff if (!header_buf || !symlink_buf || !name_buf) 4611da177e4SLinus Torvalds panic("can't allocate buffers"); 46230d65dbfSAlain Knaff 4631da177e4SLinus Torvalds state = Start; 4641da177e4SLinus Torvalds this_header = 0; 4651da177e4SLinus Torvalds message = NULL; 4661da177e4SLinus Torvalds while (!message && len) { 4671da177e4SLinus Torvalds loff_t saved_offset = this_header; 4681da177e4SLinus Torvalds if (*buf == '0' && !(this_header & 3)) { 4691da177e4SLinus Torvalds state = Start; 4701da177e4SLinus Torvalds written = write_buffer(buf, len); 4711da177e4SLinus Torvalds buf += written; 4721da177e4SLinus Torvalds len -= written; 4731da177e4SLinus Torvalds continue; 4741da177e4SLinus Torvalds } 4751da177e4SLinus Torvalds if (!*buf) { 4761da177e4SLinus Torvalds buf++; 4771da177e4SLinus Torvalds len--; 4781da177e4SLinus Torvalds this_header++; 4791da177e4SLinus Torvalds continue; 4801da177e4SLinus Torvalds } 4811da177e4SLinus Torvalds this_header = 0; 48223a22d57SH. Peter Anvin decompress = decompress_method(buf, len, &compress_name); 4836aa7a29aSDaniel M. Weeks pr_debug("Detected %s compressed data\n", compress_name); 48454291362SPhillip Lougher if (decompress) { 485d97b07c5SYinghai Lu int res = decompress(buf, len, NULL, flush_buffer, NULL, 486889c92d2SH. Peter Anvin &my_inptr, error); 48754291362SPhillip Lougher if (res) 48854291362SPhillip Lougher error("decompressor failed"); 48954291362SPhillip Lougher } else if (compress_name) { 49023a22d57SH. Peter Anvin if (!message) { 49123a22d57SH. Peter Anvin snprintf(msg_buf, sizeof msg_buf, 49223a22d57SH. Peter Anvin "compression method %s not configured", 49323a22d57SH. Peter Anvin compress_name); 49423a22d57SH. Peter Anvin message = msg_buf; 49523a22d57SH. Peter Anvin } 496df37bd15SPhillip Lougher } else 497df37bd15SPhillip Lougher error("junk in compressed archive"); 4981da177e4SLinus Torvalds if (state != Reset) 49930d65dbfSAlain Knaff error("junk in compressed archive"); 50030d65dbfSAlain Knaff this_header = saved_offset + my_inptr; 50130d65dbfSAlain Knaff buf += my_inptr; 50230d65dbfSAlain Knaff len -= my_inptr; 5031da177e4SLinus Torvalds } 504889d51a1SNye Liu dir_utime(); 5053265e66bSThomas Petazzoni kfree(name_buf); 5063265e66bSThomas Petazzoni kfree(symlink_buf); 5073265e66bSThomas Petazzoni kfree(header_buf); 5081da177e4SLinus Torvalds return message; 5091da177e4SLinus Torvalds } 5101da177e4SLinus Torvalds 5110a7b35cbSMichael Neuling static int __initdata do_retain_initrd; 5120a7b35cbSMichael Neuling 5130a7b35cbSMichael Neuling static int __init retain_initrd_param(char *str) 5140a7b35cbSMichael Neuling { 5150a7b35cbSMichael Neuling if (*str) 5160a7b35cbSMichael Neuling return 0; 5170a7b35cbSMichael Neuling do_retain_initrd = 1; 5180a7b35cbSMichael Neuling return 1; 5190a7b35cbSMichael Neuling } 5200a7b35cbSMichael Neuling __setup("retain_initrd", retain_initrd_param); 5210a7b35cbSMichael Neuling 522ffe8018cSHendrik Brueckner extern char __initramfs_start[]; 523ffe8018cSHendrik Brueckner extern unsigned long __initramfs_size; 5241da177e4SLinus Torvalds #include <linux/initrd.h> 5259c15e852SHaren Myneni #include <linux/kexec.h> 5260f3d2bd5SJan Beulich 5270f3d2bd5SJan Beulich static void __init free_initrd(void) 5280f3d2bd5SJan Beulich { 5299c15e852SHaren Myneni #ifdef CONFIG_KEXEC 5309c15e852SHaren Myneni unsigned long crashk_start = (unsigned long)__va(crashk_res.start); 5319c15e852SHaren Myneni unsigned long crashk_end = (unsigned long)__va(crashk_res.end); 5320a7b35cbSMichael Neuling #endif 5330a7b35cbSMichael Neuling if (do_retain_initrd) 5340a7b35cbSMichael Neuling goto skip; 5359c15e852SHaren Myneni 5360a7b35cbSMichael Neuling #ifdef CONFIG_KEXEC 5379c15e852SHaren Myneni /* 5389c15e852SHaren Myneni * If the initrd region is overlapped with crashkernel reserved region, 5399c15e852SHaren Myneni * free only memory that is not part of crashkernel region. 5409c15e852SHaren Myneni */ 5419c15e852SHaren Myneni if (initrd_start < crashk_end && initrd_end > crashk_start) { 5429c15e852SHaren Myneni /* 5439c15e852SHaren Myneni * Initialize initrd memory region since the kexec boot does 5449c15e852SHaren Myneni * not do. 5459c15e852SHaren Myneni */ 5469c15e852SHaren Myneni memset((void *)initrd_start, 0, initrd_end - initrd_start); 5479c15e852SHaren Myneni if (initrd_start < crashk_start) 5489c15e852SHaren Myneni free_initrd_mem(initrd_start, crashk_start); 5499c15e852SHaren Myneni if (initrd_end > crashk_end) 5509c15e852SHaren Myneni free_initrd_mem(crashk_end, initrd_end); 5519c15e852SHaren Myneni } else 5529c15e852SHaren Myneni #endif 5530f3d2bd5SJan Beulich free_initrd_mem(initrd_start, initrd_end); 5540a7b35cbSMichael Neuling skip: 5550f3d2bd5SJan Beulich initrd_start = 0; 5560f3d2bd5SJan Beulich initrd_end = 0; 5570f3d2bd5SJan Beulich } 5580f3d2bd5SJan Beulich 559b52bb371SNikanth Karthikesan #ifdef CONFIG_BLK_DEV_RAM 560df52092fSLi, Shaohua #define BUF_SIZE 1024 561df52092fSLi, Shaohua static void __init clean_rootfs(void) 562df52092fSLi, Shaohua { 563df52092fSLi, Shaohua int fd; 564df52092fSLi, Shaohua void *buf; 565df52092fSLi, Shaohua struct linux_dirent64 *dirp; 5668aaed5beSH Hartley Sweeten int num; 567df52092fSLi, Shaohua 568c67e5382SH Hartley Sweeten fd = sys_open("/", O_RDONLY, 0); 569df52092fSLi, Shaohua WARN_ON(fd < 0); 570df52092fSLi, Shaohua if (fd < 0) 571df52092fSLi, Shaohua return; 572df52092fSLi, Shaohua buf = kzalloc(BUF_SIZE, GFP_KERNEL); 573df52092fSLi, Shaohua WARN_ON(!buf); 574df52092fSLi, Shaohua if (!buf) { 575df52092fSLi, Shaohua sys_close(fd); 576df52092fSLi, Shaohua return; 577df52092fSLi, Shaohua } 578df52092fSLi, Shaohua 579df52092fSLi, Shaohua dirp = buf; 5808aaed5beSH Hartley Sweeten num = sys_getdents64(fd, dirp, BUF_SIZE); 5818aaed5beSH Hartley Sweeten while (num > 0) { 5828aaed5beSH Hartley Sweeten while (num > 0) { 583df52092fSLi, Shaohua struct stat st; 584df52092fSLi, Shaohua int ret; 585df52092fSLi, Shaohua 586df52092fSLi, Shaohua ret = sys_newlstat(dirp->d_name, &st); 587df52092fSLi, Shaohua WARN_ON_ONCE(ret); 588df52092fSLi, Shaohua if (!ret) { 589df52092fSLi, Shaohua if (S_ISDIR(st.st_mode)) 590df52092fSLi, Shaohua sys_rmdir(dirp->d_name); 591df52092fSLi, Shaohua else 592df52092fSLi, Shaohua sys_unlink(dirp->d_name); 593df52092fSLi, Shaohua } 594df52092fSLi, Shaohua 5958aaed5beSH Hartley Sweeten num -= dirp->d_reclen; 596df52092fSLi, Shaohua dirp = (void *)dirp + dirp->d_reclen; 597df52092fSLi, Shaohua } 598df52092fSLi, Shaohua dirp = buf; 599df52092fSLi, Shaohua memset(buf, 0, BUF_SIZE); 6008aaed5beSH Hartley Sweeten num = sys_getdents64(fd, dirp, BUF_SIZE); 601df52092fSLi, Shaohua } 602df52092fSLi, Shaohua 603df52092fSLi, Shaohua sys_close(fd); 604df52092fSLi, Shaohua kfree(buf); 605df52092fSLi, Shaohua } 606b52bb371SNikanth Karthikesan #endif 607df52092fSLi, Shaohua 6089a9e0d68SLinus Torvalds static int __init populate_rootfs(void) 6091da177e4SLinus Torvalds { 610ffe8018cSHendrik Brueckner char *err = unpack_to_rootfs(__initramfs_start, __initramfs_size); 6111da177e4SLinus Torvalds if (err) 612499a4584STetsuo Handa panic("%s", err); /* Failed to decompress INTERNAL initramfs */ 6131da177e4SLinus Torvalds if (initrd_start) { 614340e48e6SZdenek Pavlas #ifdef CONFIG_BLK_DEV_RAM 6151da177e4SLinus Torvalds int fd; 616a1e6b6c1SEric Piel printk(KERN_INFO "Trying to unpack rootfs image as initramfs...\n"); 6171da177e4SLinus Torvalds err = unpack_to_rootfs((char *)initrd_start, 618df52092fSLi, Shaohua initrd_end - initrd_start); 6191da177e4SLinus Torvalds if (!err) { 6200f3d2bd5SJan Beulich free_initrd(); 621bb813f4cSTejun Heo goto done; 622df52092fSLi, Shaohua } else { 623df52092fSLi, Shaohua clean_rootfs(); 624ffe8018cSHendrik Brueckner unpack_to_rootfs(__initramfs_start, __initramfs_size); 6251da177e4SLinus Torvalds } 626c1c490e0SSimon Kitching printk(KERN_INFO "rootfs image is not initramfs (%s)" 627c1c490e0SSimon Kitching "; looks like an initrd\n", err); 628c67e5382SH Hartley Sweeten fd = sys_open("/initrd.image", 629562f5e63SNamhyung Kim O_WRONLY|O_CREAT, 0700); 6301da177e4SLinus Torvalds if (fd >= 0) { 63138747439SYinghai Lu ssize_t written = xwrite(fd, (char *)initrd_start, 6321da177e4SLinus Torvalds initrd_end - initrd_start); 63338747439SYinghai Lu 63438747439SYinghai Lu if (written != initrd_end - initrd_start) 63538747439SYinghai Lu pr_err("/initrd.image: incomplete write (%zd != %ld)\n", 63638747439SYinghai Lu written, initrd_end - initrd_start); 63738747439SYinghai Lu 6381da177e4SLinus Torvalds sys_close(fd); 6390f3d2bd5SJan Beulich free_initrd(); 6401da177e4SLinus Torvalds } 641bb813f4cSTejun Heo done: 642340e48e6SZdenek Pavlas #else 643a1e6b6c1SEric Piel printk(KERN_INFO "Unpacking initramfs...\n"); 644340e48e6SZdenek Pavlas err = unpack_to_rootfs((char *)initrd_start, 645df52092fSLi, Shaohua initrd_end - initrd_start); 646a1e6b6c1SEric Piel if (err) 647a1e6b6c1SEric Piel printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err); 648340e48e6SZdenek Pavlas free_initrd(); 649340e48e6SZdenek Pavlas #endif 650bb813f4cSTejun Heo /* 651bb813f4cSTejun Heo * Try loading default modules from initramfs. This gives 652bb813f4cSTejun Heo * us a chance to load before device_initcalls. 653bb813f4cSTejun Heo */ 654bb813f4cSTejun Heo load_default_modules(); 6551da177e4SLinus Torvalds } 6568d610dd5SLinus Torvalds return 0; 6571da177e4SLinus Torvalds } 6588d610dd5SLinus Torvalds rootfs_initcall(populate_rootfs); 659