1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0 21da177e4SLinus Torvalds #include <linux/init.h> 31da177e4SLinus Torvalds #include <linux/fs.h> 41da177e4SLinus Torvalds #include <linux/slab.h> 51da177e4SLinus Torvalds #include <linux/types.h> 61da177e4SLinus Torvalds #include <linux/fcntl.h> 71da177e4SLinus Torvalds #include <linux/delay.h> 81da177e4SLinus Torvalds #include <linux/string.h> 9df52092fSLi, Shaohua #include <linux/dirent.h> 101da177e4SLinus Torvalds #include <linux/syscalls.h> 11889d51a1SNye Liu #include <linux/utime.h> 1208865514SLokesh Vutla #include <linux/file.h> 131da177e4SLinus Torvalds 1438747439SYinghai Lu static ssize_t __init xwrite(int fd, const char *p, size_t count) 1538747439SYinghai Lu { 1638747439SYinghai Lu ssize_t out = 0; 1738747439SYinghai Lu 1838747439SYinghai Lu /* sys_write only can write MAX_RW_COUNT aka 2G-4K bytes at most */ 1938747439SYinghai Lu while (count) { 20e7a3e8b2SDominik Brodowski ssize_t rv = ksys_write(fd, p, count); 2138747439SYinghai Lu 2238747439SYinghai Lu if (rv < 0) { 2338747439SYinghai Lu if (rv == -EINTR || rv == -EAGAIN) 2438747439SYinghai Lu continue; 2538747439SYinghai Lu return out ? out : rv; 2638747439SYinghai Lu } else if (rv == 0) 2738747439SYinghai Lu break; 2838747439SYinghai Lu 2938747439SYinghai Lu p += rv; 3038747439SYinghai Lu out += rv; 3138747439SYinghai Lu count -= rv; 3238747439SYinghai Lu } 3338747439SYinghai Lu 3438747439SYinghai Lu return out; 3538747439SYinghai Lu } 3638747439SYinghai Lu 371da177e4SLinus Torvalds static __initdata char *message; 381da177e4SLinus Torvalds static void __init error(char *x) 391da177e4SLinus Torvalds { 401da177e4SLinus Torvalds if (!message) 411da177e4SLinus Torvalds message = x; 421da177e4SLinus Torvalds } 431da177e4SLinus Torvalds 441da177e4SLinus Torvalds /* link hash */ 451da177e4SLinus Torvalds 466a050da4SMark Huang #define N_ALIGN(len) ((((len) + 1) & ~3) + 2) 476a050da4SMark Huang 481da177e4SLinus Torvalds static __initdata struct hash { 491da177e4SLinus Torvalds int ino, minor, major; 50685dd2d5SAl Viro umode_t mode; 511da177e4SLinus Torvalds struct hash *next; 526a050da4SMark Huang char name[N_ALIGN(PATH_MAX)]; 531da177e4SLinus Torvalds } *head[32]; 541da177e4SLinus Torvalds 551da177e4SLinus Torvalds static inline int hash(int major, int minor, int ino) 561da177e4SLinus Torvalds { 571da177e4SLinus Torvalds unsigned long tmp = ino + minor + (major << 3); 581da177e4SLinus Torvalds tmp += tmp >> 5; 591da177e4SLinus Torvalds return tmp & 31; 601da177e4SLinus Torvalds } 611da177e4SLinus Torvalds 622139a7fbSH. Peter Anvin static char __init *find_link(int major, int minor, int ino, 63685dd2d5SAl Viro umode_t mode, char *name) 641da177e4SLinus Torvalds { 651da177e4SLinus Torvalds struct hash **p, *q; 661da177e4SLinus Torvalds for (p = head + hash(major, minor, ino); *p; p = &(*p)->next) { 671da177e4SLinus Torvalds if ((*p)->ino != ino) 681da177e4SLinus Torvalds continue; 691da177e4SLinus Torvalds if ((*p)->minor != minor) 701da177e4SLinus Torvalds continue; 711da177e4SLinus Torvalds if ((*p)->major != major) 721da177e4SLinus Torvalds continue; 732139a7fbSH. Peter Anvin if (((*p)->mode ^ mode) & S_IFMT) 742139a7fbSH. Peter Anvin continue; 751da177e4SLinus Torvalds return (*p)->name; 761da177e4SLinus Torvalds } 773265e66bSThomas Petazzoni q = kmalloc(sizeof(struct hash), GFP_KERNEL); 781da177e4SLinus Torvalds if (!q) 791da177e4SLinus Torvalds panic("can't allocate link hash entry"); 801da177e4SLinus Torvalds q->major = major; 812139a7fbSH. Peter Anvin q->minor = minor; 822139a7fbSH. Peter Anvin q->ino = ino; 832139a7fbSH. Peter Anvin q->mode = mode; 846a050da4SMark Huang strcpy(q->name, name); 851da177e4SLinus Torvalds q->next = NULL; 861da177e4SLinus Torvalds *p = q; 871da177e4SLinus Torvalds return NULL; 881da177e4SLinus Torvalds } 891da177e4SLinus Torvalds 901da177e4SLinus Torvalds static void __init free_hash(void) 911da177e4SLinus Torvalds { 921da177e4SLinus Torvalds struct hash **p, *q; 931da177e4SLinus Torvalds for (p = head; p < head + 32; p++) { 941da177e4SLinus Torvalds while (*p) { 951da177e4SLinus Torvalds q = *p; 961da177e4SLinus Torvalds *p = q->next; 973265e66bSThomas Petazzoni kfree(q); 981da177e4SLinus Torvalds } 991da177e4SLinus Torvalds } 1001da177e4SLinus Torvalds } 1011da177e4SLinus Torvalds 102e35c4c64SArnd Bergmann static long __init do_utime(char *filename, time64_t mtime) 103889d51a1SNye Liu { 104aaed2dd8SDeepa Dinamani struct timespec64 t[2]; 105889d51a1SNye Liu 106889d51a1SNye Liu t[0].tv_sec = mtime; 107889d51a1SNye Liu t[0].tv_nsec = 0; 108889d51a1SNye Liu t[1].tv_sec = mtime; 109889d51a1SNye Liu t[1].tv_nsec = 0; 110889d51a1SNye Liu 111889d51a1SNye Liu return do_utimes(AT_FDCWD, filename, t, AT_SYMLINK_NOFOLLOW); 112889d51a1SNye Liu } 113889d51a1SNye Liu 114889d51a1SNye Liu static __initdata LIST_HEAD(dir_list); 115889d51a1SNye Liu struct dir_entry { 116889d51a1SNye Liu struct list_head list; 117889d51a1SNye Liu char *name; 118e35c4c64SArnd Bergmann time64_t mtime; 119889d51a1SNye Liu }; 120889d51a1SNye Liu 121e35c4c64SArnd Bergmann static void __init dir_add(const char *name, time64_t mtime) 122889d51a1SNye Liu { 123889d51a1SNye Liu struct dir_entry *de = kmalloc(sizeof(struct dir_entry), GFP_KERNEL); 124889d51a1SNye Liu if (!de) 125889d51a1SNye Liu panic("can't allocate dir_entry buffer"); 126889d51a1SNye Liu INIT_LIST_HEAD(&de->list); 127889d51a1SNye Liu de->name = kstrdup(name, GFP_KERNEL); 128889d51a1SNye Liu de->mtime = mtime; 129889d51a1SNye Liu list_add(&de->list, &dir_list); 130889d51a1SNye Liu } 131889d51a1SNye Liu 132889d51a1SNye Liu static void __init dir_utime(void) 133889d51a1SNye Liu { 134889d51a1SNye Liu struct dir_entry *de, *tmp; 135889d51a1SNye Liu list_for_each_entry_safe(de, tmp, &dir_list, list) { 136889d51a1SNye Liu list_del(&de->list); 137889d51a1SNye Liu do_utime(de->name, de->mtime); 138889d51a1SNye Liu kfree(de->name); 139889d51a1SNye Liu kfree(de); 140889d51a1SNye Liu } 141889d51a1SNye Liu } 142889d51a1SNye Liu 143e35c4c64SArnd Bergmann static __initdata time64_t mtime; 144889d51a1SNye Liu 1451da177e4SLinus Torvalds /* cpio header parsing */ 1461da177e4SLinus Torvalds 1471da177e4SLinus Torvalds static __initdata unsigned long ino, major, minor, nlink; 148685dd2d5SAl Viro static __initdata umode_t mode; 1491da177e4SLinus Torvalds static __initdata unsigned long body_len, name_len; 1501da177e4SLinus Torvalds static __initdata uid_t uid; 1511da177e4SLinus Torvalds static __initdata gid_t gid; 1521da177e4SLinus Torvalds static __initdata unsigned rdev; 1531da177e4SLinus Torvalds 1541da177e4SLinus Torvalds static void __init parse_header(char *s) 1551da177e4SLinus Torvalds { 1561da177e4SLinus Torvalds unsigned long parsed[12]; 1571da177e4SLinus Torvalds char buf[9]; 1581da177e4SLinus Torvalds int i; 1591da177e4SLinus Torvalds 1601da177e4SLinus Torvalds buf[8] = '\0'; 1611da177e4SLinus Torvalds for (i = 0, s += 6; i < 12; i++, s += 8) { 1621da177e4SLinus Torvalds memcpy(buf, s, 8); 1631da177e4SLinus Torvalds parsed[i] = simple_strtoul(buf, NULL, 16); 1641da177e4SLinus Torvalds } 1651da177e4SLinus Torvalds ino = parsed[0]; 1661da177e4SLinus Torvalds mode = parsed[1]; 1671da177e4SLinus Torvalds uid = parsed[2]; 1681da177e4SLinus Torvalds gid = parsed[3]; 1691da177e4SLinus Torvalds nlink = parsed[4]; 170e35c4c64SArnd Bergmann mtime = parsed[5]; /* breaks in y2106 */ 1711da177e4SLinus Torvalds body_len = parsed[6]; 1721da177e4SLinus Torvalds major = parsed[7]; 1731da177e4SLinus Torvalds minor = parsed[8]; 1741da177e4SLinus Torvalds rdev = new_encode_dev(MKDEV(parsed[9], parsed[10])); 1751da177e4SLinus Torvalds name_len = parsed[11]; 1761da177e4SLinus Torvalds } 1771da177e4SLinus Torvalds 1781da177e4SLinus Torvalds /* FSM */ 1791da177e4SLinus Torvalds 1801da177e4SLinus Torvalds static __initdata enum state { 1811da177e4SLinus Torvalds Start, 1821da177e4SLinus Torvalds Collect, 1831da177e4SLinus Torvalds GotHeader, 1841da177e4SLinus Torvalds SkipIt, 1851da177e4SLinus Torvalds GotName, 1861da177e4SLinus Torvalds CopyFile, 1871da177e4SLinus Torvalds GotSymlink, 1881da177e4SLinus Torvalds Reset 1891da177e4SLinus Torvalds } state, next_state; 1901da177e4SLinus Torvalds 1911da177e4SLinus Torvalds static __initdata char *victim; 192c34d85acSMark Rustad static unsigned long byte_count __initdata; 1931da177e4SLinus Torvalds static __initdata loff_t this_header, next_header; 1941da177e4SLinus Torvalds 195b0a5ab93SAl Viro static inline void __init eat(unsigned n) 1961da177e4SLinus Torvalds { 1971da177e4SLinus Torvalds victim += n; 1981da177e4SLinus Torvalds this_header += n; 199c34d85acSMark Rustad byte_count -= n; 2001da177e4SLinus Torvalds } 2011da177e4SLinus Torvalds 202889d51a1SNye Liu static __initdata char *vcollected; 2031da177e4SLinus Torvalds static __initdata char *collected; 204d97b07c5SYinghai Lu static long remains __initdata; 2051da177e4SLinus Torvalds static __initdata char *collect; 2061da177e4SLinus Torvalds 2071da177e4SLinus Torvalds static void __init read_into(char *buf, unsigned size, enum state next) 2081da177e4SLinus Torvalds { 209c34d85acSMark Rustad if (byte_count >= size) { 2101da177e4SLinus Torvalds collected = victim; 2111da177e4SLinus Torvalds eat(size); 2121da177e4SLinus Torvalds state = next; 2131da177e4SLinus Torvalds } else { 2141da177e4SLinus Torvalds collect = collected = buf; 2151da177e4SLinus Torvalds remains = size; 2161da177e4SLinus Torvalds next_state = next; 2171da177e4SLinus Torvalds state = Collect; 2181da177e4SLinus Torvalds } 2191da177e4SLinus Torvalds } 2201da177e4SLinus Torvalds 2211da177e4SLinus Torvalds static __initdata char *header_buf, *symlink_buf, *name_buf; 2221da177e4SLinus Torvalds 2231da177e4SLinus Torvalds static int __init do_start(void) 2241da177e4SLinus Torvalds { 2251da177e4SLinus Torvalds read_into(header_buf, 110, GotHeader); 2261da177e4SLinus Torvalds return 0; 2271da177e4SLinus Torvalds } 2281da177e4SLinus Torvalds 2291da177e4SLinus Torvalds static int __init do_collect(void) 2301da177e4SLinus Torvalds { 231d97b07c5SYinghai Lu unsigned long n = remains; 232c34d85acSMark Rustad if (byte_count < n) 233c34d85acSMark Rustad n = byte_count; 2341da177e4SLinus Torvalds memcpy(collect, victim, n); 2351da177e4SLinus Torvalds eat(n); 2361da177e4SLinus Torvalds collect += n; 2371da177e4SLinus Torvalds if ((remains -= n) != 0) 2381da177e4SLinus Torvalds return 1; 2391da177e4SLinus Torvalds state = next_state; 2401da177e4SLinus Torvalds return 0; 2411da177e4SLinus Torvalds } 2421da177e4SLinus Torvalds 2431da177e4SLinus Torvalds static int __init do_header(void) 2441da177e4SLinus Torvalds { 2452e591bbcSArjan van de Ven if (memcmp(collected, "070707", 6)==0) { 2462e591bbcSArjan van de Ven error("incorrect cpio method used: use -H newc option"); 2472e591bbcSArjan van de Ven return 1; 2482e591bbcSArjan van de Ven } 2491da177e4SLinus Torvalds if (memcmp(collected, "070701", 6)) { 2501da177e4SLinus Torvalds error("no cpio magic"); 2511da177e4SLinus Torvalds return 1; 2521da177e4SLinus Torvalds } 2531da177e4SLinus Torvalds parse_header(collected); 2541da177e4SLinus Torvalds next_header = this_header + N_ALIGN(name_len) + body_len; 2551da177e4SLinus Torvalds next_header = (next_header + 3) & ~3; 2561da177e4SLinus Torvalds state = SkipIt; 2571da177e4SLinus Torvalds if (name_len <= 0 || name_len > PATH_MAX) 2581da177e4SLinus Torvalds return 0; 2591da177e4SLinus Torvalds if (S_ISLNK(mode)) { 2601da177e4SLinus Torvalds if (body_len > PATH_MAX) 2611da177e4SLinus Torvalds return 0; 2621da177e4SLinus Torvalds collect = collected = symlink_buf; 2631da177e4SLinus Torvalds remains = N_ALIGN(name_len) + body_len; 2641da177e4SLinus Torvalds next_state = GotSymlink; 2651da177e4SLinus Torvalds state = Collect; 2661da177e4SLinus Torvalds return 0; 2671da177e4SLinus Torvalds } 2681da177e4SLinus Torvalds if (S_ISREG(mode) || !body_len) 2691da177e4SLinus Torvalds read_into(name_buf, N_ALIGN(name_len), GotName); 2701da177e4SLinus Torvalds return 0; 2711da177e4SLinus Torvalds } 2721da177e4SLinus Torvalds 2731da177e4SLinus Torvalds static int __init do_skip(void) 2741da177e4SLinus Torvalds { 275c34d85acSMark Rustad if (this_header + byte_count < next_header) { 276c34d85acSMark Rustad eat(byte_count); 2771da177e4SLinus Torvalds return 1; 2781da177e4SLinus Torvalds } else { 2791da177e4SLinus Torvalds eat(next_header - this_header); 2801da177e4SLinus Torvalds state = next_state; 2811da177e4SLinus Torvalds return 0; 2821da177e4SLinus Torvalds } 2831da177e4SLinus Torvalds } 2841da177e4SLinus Torvalds 2851da177e4SLinus Torvalds static int __init do_reset(void) 2861da177e4SLinus Torvalds { 287c34d85acSMark Rustad while (byte_count && *victim == '\0') 2881da177e4SLinus Torvalds eat(1); 289c34d85acSMark Rustad if (byte_count && (this_header & 3)) 2901da177e4SLinus Torvalds error("broken padding"); 2911da177e4SLinus Torvalds return 1; 2921da177e4SLinus Torvalds } 2931da177e4SLinus Torvalds 294c34d85acSMark Rustad static void __init clean_path(char *path, umode_t fmode) 2952139a7fbSH. Peter Anvin { 296046aa126SArnd Bergmann struct kstat st; 2972139a7fbSH. Peter Anvin 298046aa126SArnd Bergmann if (!vfs_lstat(path, &st) && (st.mode ^ fmode) & S_IFMT) { 299046aa126SArnd Bergmann if (S_ISDIR(st.mode)) 300f459dffaSDominik Brodowski ksys_rmdir(path); 3012139a7fbSH. Peter Anvin else 3020f32ab8cSDominik Brodowski ksys_unlink(path); 3032139a7fbSH. Peter Anvin } 3042139a7fbSH. Peter Anvin } 3052139a7fbSH. Peter Anvin 3067c0950d4SLi Zhijian static int __init maybe_link(void) 3077c0950d4SLi Zhijian { 3087c0950d4SLi Zhijian if (nlink >= 2) { 3097c0950d4SLi Zhijian char *old = find_link(major, minor, ino, mode, collected); 3107c0950d4SLi Zhijian if (old) { 3117c0950d4SLi Zhijian clean_path(collected, 0); 3127c0950d4SLi Zhijian return (ksys_link(old, collected) < 0) ? -1 : 1; 3137c0950d4SLi Zhijian } 3147c0950d4SLi Zhijian } 3157c0950d4SLi Zhijian return 0; 3167c0950d4SLi Zhijian } 3177c0950d4SLi Zhijian 3181da177e4SLinus Torvalds static __initdata int wfd; 3191da177e4SLinus Torvalds 3201da177e4SLinus Torvalds static int __init do_name(void) 3211da177e4SLinus Torvalds { 3221da177e4SLinus Torvalds state = SkipIt; 3231da177e4SLinus Torvalds next_state = Reset; 3241da177e4SLinus Torvalds if (strcmp(collected, "TRAILER!!!") == 0) { 3251da177e4SLinus Torvalds free_hash(); 3261da177e4SLinus Torvalds return 0; 3271da177e4SLinus Torvalds } 3282139a7fbSH. Peter Anvin clean_path(collected, mode); 3291da177e4SLinus Torvalds if (S_ISREG(mode)) { 3302139a7fbSH. Peter Anvin int ml = maybe_link(); 3312139a7fbSH. Peter Anvin if (ml >= 0) { 3322139a7fbSH. Peter Anvin int openflags = O_WRONLY|O_CREAT; 3332139a7fbSH. Peter Anvin if (ml != 1) 3342139a7fbSH. Peter Anvin openflags |= O_TRUNC; 335bae217eaSDominik Brodowski wfd = ksys_open(collected, openflags, mode); 3362139a7fbSH. Peter Anvin 3371da177e4SLinus Torvalds if (wfd >= 0) { 33855731b3cSDominik Brodowski ksys_fchown(wfd, uid, gid); 33903450e27SDominik Brodowski ksys_fchmod(wfd, mode); 340d20d5a74SRandy Robertson if (body_len) 341411d9475SDominik Brodowski ksys_ftruncate(wfd, body_len); 342889d51a1SNye Liu vcollected = kstrdup(collected, GFP_KERNEL); 3431da177e4SLinus Torvalds state = CopyFile; 3441da177e4SLinus Torvalds } 3451da177e4SLinus Torvalds } 3461da177e4SLinus Torvalds } else if (S_ISDIR(mode)) { 3470101db7aSDominik Brodowski ksys_mkdir(collected, mode); 34855731b3cSDominik Brodowski ksys_chown(collected, uid, gid); 34903450e27SDominik Brodowski ksys_chmod(collected, mode); 350889d51a1SNye Liu dir_add(collected, mtime); 3511da177e4SLinus Torvalds } else if (S_ISBLK(mode) || S_ISCHR(mode) || 3521da177e4SLinus Torvalds S_ISFIFO(mode) || S_ISSOCK(mode)) { 3531da177e4SLinus Torvalds if (maybe_link() == 0) { 35487c4e192SDominik Brodowski ksys_mknod(collected, mode, rdev); 35555731b3cSDominik Brodowski ksys_chown(collected, uid, gid); 35603450e27SDominik Brodowski ksys_chmod(collected, mode); 357889d51a1SNye Liu do_utime(collected, mtime); 3581da177e4SLinus Torvalds } 3591da177e4SLinus Torvalds } 3601da177e4SLinus Torvalds return 0; 3611da177e4SLinus Torvalds } 3621da177e4SLinus Torvalds 3631da177e4SLinus Torvalds static int __init do_copy(void) 3641da177e4SLinus Torvalds { 365c34d85acSMark Rustad if (byte_count >= body_len) { 3669687fd91SDavid Engraf if (xwrite(wfd, victim, body_len) != body_len) 3679687fd91SDavid Engraf error("write error"); 3682ca2a09dSDominik Brodowski ksys_close(wfd); 369889d51a1SNye Liu do_utime(vcollected, mtime); 370889d51a1SNye Liu kfree(vcollected); 3711da177e4SLinus Torvalds eat(body_len); 3721da177e4SLinus Torvalds state = SkipIt; 3731da177e4SLinus Torvalds return 0; 3741da177e4SLinus Torvalds } else { 375c34d85acSMark Rustad if (xwrite(wfd, victim, byte_count) != byte_count) 3769687fd91SDavid Engraf error("write error"); 377c34d85acSMark Rustad body_len -= byte_count; 378c34d85acSMark Rustad eat(byte_count); 3791da177e4SLinus Torvalds return 1; 3801da177e4SLinus Torvalds } 3811da177e4SLinus Torvalds } 3821da177e4SLinus Torvalds 3831da177e4SLinus Torvalds static int __init do_symlink(void) 3841da177e4SLinus Torvalds { 3851da177e4SLinus Torvalds collected[N_ALIGN(name_len) + body_len] = '\0'; 3862139a7fbSH. Peter Anvin clean_path(collected, 0); 387b724e846SDominik Brodowski ksys_symlink(collected + N_ALIGN(name_len), collected); 38855731b3cSDominik Brodowski ksys_lchown(collected, uid, gid); 389889d51a1SNye Liu do_utime(collected, mtime); 3901da177e4SLinus Torvalds state = SkipIt; 3911da177e4SLinus Torvalds next_state = Reset; 3921da177e4SLinus Torvalds return 0; 3931da177e4SLinus Torvalds } 3941da177e4SLinus Torvalds 3951da177e4SLinus Torvalds static __initdata int (*actions[])(void) = { 3961da177e4SLinus Torvalds [Start] = do_start, 3971da177e4SLinus Torvalds [Collect] = do_collect, 3981da177e4SLinus Torvalds [GotHeader] = do_header, 3991da177e4SLinus Torvalds [SkipIt] = do_skip, 4001da177e4SLinus Torvalds [GotName] = do_name, 4011da177e4SLinus Torvalds [CopyFile] = do_copy, 4021da177e4SLinus Torvalds [GotSymlink] = do_symlink, 4031da177e4SLinus Torvalds [Reset] = do_reset, 4041da177e4SLinus Torvalds }; 4051da177e4SLinus Torvalds 406d97b07c5SYinghai Lu static long __init write_buffer(char *buf, unsigned long len) 4071da177e4SLinus Torvalds { 408c34d85acSMark Rustad byte_count = len; 4091da177e4SLinus Torvalds victim = buf; 4101da177e4SLinus Torvalds 4111da177e4SLinus Torvalds while (!actions[state]()) 4121da177e4SLinus Torvalds ; 413c34d85acSMark Rustad return len - byte_count; 4141da177e4SLinus Torvalds } 4151da177e4SLinus Torvalds 416d97b07c5SYinghai Lu static long __init flush_buffer(void *bufv, unsigned long len) 4171da177e4SLinus Torvalds { 41830d65dbfSAlain Knaff char *buf = (char *) bufv; 419d97b07c5SYinghai Lu long written; 420d97b07c5SYinghai Lu long origLen = len; 4211da177e4SLinus Torvalds if (message) 42230d65dbfSAlain Knaff return -1; 4231da177e4SLinus Torvalds while ((written = write_buffer(buf, len)) < len && !message) { 4241da177e4SLinus Torvalds char c = buf[written]; 4251da177e4SLinus Torvalds if (c == '0') { 4261da177e4SLinus Torvalds buf += written; 4271da177e4SLinus Torvalds len -= written; 4281da177e4SLinus Torvalds state = Start; 4291da177e4SLinus Torvalds } else if (c == 0) { 4301da177e4SLinus Torvalds buf += written; 4311da177e4SLinus Torvalds len -= written; 4321da177e4SLinus Torvalds state = Reset; 4331da177e4SLinus Torvalds } else 434e5eed351SDavid Engraf error("junk within compressed archive"); 4351da177e4SLinus Torvalds } 43630d65dbfSAlain Knaff return origLen; 4371da177e4SLinus Torvalds } 4381da177e4SLinus Torvalds 439d97b07c5SYinghai Lu static unsigned long my_inptr; /* index of next byte to be processed in inbuf */ 4401da177e4SLinus Torvalds 441889c92d2SH. Peter Anvin #include <linux/decompress/generic.h> 4421da177e4SLinus Torvalds 443d97b07c5SYinghai Lu static char * __init unpack_to_rootfs(char *buf, unsigned long len) 4441da177e4SLinus Torvalds { 445d97b07c5SYinghai Lu long written; 446889c92d2SH. Peter Anvin decompress_fn decompress; 44723a22d57SH. Peter Anvin const char *compress_name; 44823a22d57SH. Peter Anvin static __initdata char msg_buf[64]; 449889c92d2SH. Peter Anvin 4503265e66bSThomas Petazzoni header_buf = kmalloc(110, GFP_KERNEL); 4513265e66bSThomas Petazzoni symlink_buf = kmalloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1, GFP_KERNEL); 4523265e66bSThomas Petazzoni name_buf = kmalloc(N_ALIGN(PATH_MAX), GFP_KERNEL); 45330d65dbfSAlain Knaff 45430d65dbfSAlain Knaff if (!header_buf || !symlink_buf || !name_buf) 4551da177e4SLinus Torvalds panic("can't allocate buffers"); 45630d65dbfSAlain Knaff 4571da177e4SLinus Torvalds state = Start; 4581da177e4SLinus Torvalds this_header = 0; 4591da177e4SLinus Torvalds message = NULL; 4601da177e4SLinus Torvalds while (!message && len) { 4611da177e4SLinus Torvalds loff_t saved_offset = this_header; 4621da177e4SLinus Torvalds if (*buf == '0' && !(this_header & 3)) { 4631da177e4SLinus Torvalds state = Start; 4641da177e4SLinus Torvalds written = write_buffer(buf, len); 4651da177e4SLinus Torvalds buf += written; 4661da177e4SLinus Torvalds len -= written; 4671da177e4SLinus Torvalds continue; 4681da177e4SLinus Torvalds } 4691da177e4SLinus Torvalds if (!*buf) { 4701da177e4SLinus Torvalds buf++; 4711da177e4SLinus Torvalds len--; 4721da177e4SLinus Torvalds this_header++; 4731da177e4SLinus Torvalds continue; 4741da177e4SLinus Torvalds } 4751da177e4SLinus Torvalds this_header = 0; 47623a22d57SH. Peter Anvin decompress = decompress_method(buf, len, &compress_name); 4776aa7a29aSDaniel M. Weeks pr_debug("Detected %s compressed data\n", compress_name); 47854291362SPhillip Lougher if (decompress) { 479d97b07c5SYinghai Lu int res = decompress(buf, len, NULL, flush_buffer, NULL, 480889c92d2SH. Peter Anvin &my_inptr, error); 48154291362SPhillip Lougher if (res) 48254291362SPhillip Lougher error("decompressor failed"); 48354291362SPhillip Lougher } else if (compress_name) { 48423a22d57SH. Peter Anvin if (!message) { 48523a22d57SH. Peter Anvin snprintf(msg_buf, sizeof msg_buf, 48623a22d57SH. Peter Anvin "compression method %s not configured", 48723a22d57SH. Peter Anvin compress_name); 48823a22d57SH. Peter Anvin message = msg_buf; 48923a22d57SH. Peter Anvin } 490df37bd15SPhillip Lougher } else 491e5eed351SDavid Engraf error("invalid magic at start of compressed archive"); 4921da177e4SLinus Torvalds if (state != Reset) 493e5eed351SDavid Engraf error("junk at the end of compressed archive"); 49430d65dbfSAlain Knaff this_header = saved_offset + my_inptr; 49530d65dbfSAlain Knaff buf += my_inptr; 49630d65dbfSAlain Knaff len -= my_inptr; 4971da177e4SLinus Torvalds } 498889d51a1SNye Liu dir_utime(); 4993265e66bSThomas Petazzoni kfree(name_buf); 5003265e66bSThomas Petazzoni kfree(symlink_buf); 5013265e66bSThomas Petazzoni kfree(header_buf); 5021da177e4SLinus Torvalds return message; 5031da177e4SLinus Torvalds } 5041da177e4SLinus Torvalds 5050a7b35cbSMichael Neuling static int __initdata do_retain_initrd; 5060a7b35cbSMichael Neuling 5070a7b35cbSMichael Neuling static int __init retain_initrd_param(char *str) 5080a7b35cbSMichael Neuling { 5090a7b35cbSMichael Neuling if (*str) 5100a7b35cbSMichael Neuling return 0; 5110a7b35cbSMichael Neuling do_retain_initrd = 1; 5120a7b35cbSMichael Neuling return 1; 5130a7b35cbSMichael Neuling } 5140a7b35cbSMichael Neuling __setup("retain_initrd", retain_initrd_param); 5150a7b35cbSMichael Neuling 516d8ae8a37SChristoph Hellwig #ifdef CONFIG_ARCH_HAS_KEEPINITRD 517d8ae8a37SChristoph Hellwig static int __init keepinitrd_setup(char *__unused) 518d8ae8a37SChristoph Hellwig { 519d8ae8a37SChristoph Hellwig do_retain_initrd = 1; 520d8ae8a37SChristoph Hellwig return 1; 521d8ae8a37SChristoph Hellwig } 522d8ae8a37SChristoph Hellwig __setup("keepinitrd", keepinitrd_setup); 523d8ae8a37SChristoph Hellwig #endif 524d8ae8a37SChristoph Hellwig 525ffe8018cSHendrik Brueckner extern char __initramfs_start[]; 526ffe8018cSHendrik Brueckner extern unsigned long __initramfs_size; 5271da177e4SLinus Torvalds #include <linux/initrd.h> 5289c15e852SHaren Myneni #include <linux/kexec.h> 5290f3d2bd5SJan Beulich 530*4afd58e1SChristoph Hellwig void __weak free_initrd_mem(unsigned long start, unsigned long end) 531*4afd58e1SChristoph Hellwig { 532*4afd58e1SChristoph Hellwig free_reserved_area((void *)start, (void *)end, -1, "initrd"); 533*4afd58e1SChristoph Hellwig } 534*4afd58e1SChristoph Hellwig 5352965faa5SDave Young #ifdef CONFIG_KEXEC_CORE 53623091e28SChristoph Hellwig static bool kexec_free_initrd(void) 53723091e28SChristoph Hellwig { 5389c15e852SHaren Myneni unsigned long crashk_start = (unsigned long)__va(crashk_res.start); 5399c15e852SHaren Myneni unsigned long crashk_end = (unsigned long)__va(crashk_res.end); 5409c15e852SHaren Myneni 5419c15e852SHaren Myneni /* 5429c15e852SHaren Myneni * If the initrd region is overlapped with crashkernel reserved region, 5439c15e852SHaren Myneni * free only memory that is not part of crashkernel region. 5449c15e852SHaren Myneni */ 54523091e28SChristoph Hellwig if (initrd_start >= crashk_end || initrd_end <= crashk_start) 54623091e28SChristoph Hellwig return false; 54723091e28SChristoph Hellwig 5489c15e852SHaren Myneni /* 54923091e28SChristoph Hellwig * Initialize initrd memory region since the kexec boot does not do. 5509c15e852SHaren Myneni */ 5519c15e852SHaren Myneni memset((void *)initrd_start, 0, initrd_end - initrd_start); 5529c15e852SHaren Myneni if (initrd_start < crashk_start) 5539c15e852SHaren Myneni free_initrd_mem(initrd_start, crashk_start); 5549c15e852SHaren Myneni if (initrd_end > crashk_end) 5559c15e852SHaren Myneni free_initrd_mem(crashk_end, initrd_end); 55623091e28SChristoph Hellwig return true; 5570f3d2bd5SJan Beulich } 55823091e28SChristoph Hellwig #else 55923091e28SChristoph Hellwig static inline bool kexec_free_initrd(void) 56023091e28SChristoph Hellwig { 56123091e28SChristoph Hellwig return false; 56223091e28SChristoph Hellwig } 56323091e28SChristoph Hellwig #endif /* CONFIG_KEXEC_CORE */ 5640f3d2bd5SJan Beulich 565a841c673SAndrew Morton #ifdef CONFIG_BLK_DEV_RAM 566df52092fSLi, Shaohua #define BUF_SIZE 1024 567df52092fSLi, Shaohua static void __init clean_rootfs(void) 568df52092fSLi, Shaohua { 569df52092fSLi, Shaohua int fd; 570df52092fSLi, Shaohua void *buf; 571df52092fSLi, Shaohua struct linux_dirent64 *dirp; 5728aaed5beSH Hartley Sweeten int num; 573df52092fSLi, Shaohua 574bae217eaSDominik Brodowski fd = ksys_open("/", O_RDONLY, 0); 575df52092fSLi, Shaohua WARN_ON(fd < 0); 576df52092fSLi, Shaohua if (fd < 0) 577df52092fSLi, Shaohua return; 578df52092fSLi, Shaohua buf = kzalloc(BUF_SIZE, GFP_KERNEL); 579df52092fSLi, Shaohua WARN_ON(!buf); 580df52092fSLi, Shaohua if (!buf) { 5812ca2a09dSDominik Brodowski ksys_close(fd); 582df52092fSLi, Shaohua return; 583df52092fSLi, Shaohua } 584df52092fSLi, Shaohua 585df52092fSLi, Shaohua dirp = buf; 586454dab3fSDominik Brodowski num = ksys_getdents64(fd, dirp, BUF_SIZE); 5878aaed5beSH Hartley Sweeten while (num > 0) { 5888aaed5beSH Hartley Sweeten while (num > 0) { 589046aa126SArnd Bergmann struct kstat st; 590df52092fSLi, Shaohua int ret; 591df52092fSLi, Shaohua 592046aa126SArnd Bergmann ret = vfs_lstat(dirp->d_name, &st); 593df52092fSLi, Shaohua WARN_ON_ONCE(ret); 594df52092fSLi, Shaohua if (!ret) { 595046aa126SArnd Bergmann if (S_ISDIR(st.mode)) 596f459dffaSDominik Brodowski ksys_rmdir(dirp->d_name); 597df52092fSLi, Shaohua else 5980f32ab8cSDominik Brodowski ksys_unlink(dirp->d_name); 599df52092fSLi, Shaohua } 600df52092fSLi, Shaohua 6018aaed5beSH Hartley Sweeten num -= dirp->d_reclen; 602df52092fSLi, Shaohua dirp = (void *)dirp + dirp->d_reclen; 603df52092fSLi, Shaohua } 604df52092fSLi, Shaohua dirp = buf; 605df52092fSLi, Shaohua memset(buf, 0, BUF_SIZE); 606454dab3fSDominik Brodowski num = ksys_getdents64(fd, dirp, BUF_SIZE); 607df52092fSLi, Shaohua } 608df52092fSLi, Shaohua 6092ca2a09dSDominik Brodowski ksys_close(fd); 610df52092fSLi, Shaohua kfree(buf); 611df52092fSLi, Shaohua } 612afef7889SChristoph Hellwig #else 613afef7889SChristoph Hellwig static inline void clean_rootfs(void) 614afef7889SChristoph Hellwig { 615afef7889SChristoph Hellwig } 616afef7889SChristoph Hellwig #endif /* CONFIG_BLK_DEV_RAM */ 617df52092fSLi, Shaohua 6187c184ecdSChristoph Hellwig #ifdef CONFIG_BLK_DEV_RAM 6197c184ecdSChristoph Hellwig static void populate_initrd_image(char *err) 6207c184ecdSChristoph Hellwig { 6217c184ecdSChristoph Hellwig ssize_t written; 6227c184ecdSChristoph Hellwig int fd; 6237c184ecdSChristoph Hellwig 6247c184ecdSChristoph Hellwig unpack_to_rootfs(__initramfs_start, __initramfs_size); 6257c184ecdSChristoph Hellwig 6267c184ecdSChristoph Hellwig printk(KERN_INFO "rootfs image is not initramfs (%s); looks like an initrd\n", 6277c184ecdSChristoph Hellwig err); 6287c184ecdSChristoph Hellwig fd = ksys_open("/initrd.image", O_WRONLY | O_CREAT, 0700); 6297c184ecdSChristoph Hellwig if (fd < 0) 6307c184ecdSChristoph Hellwig return; 6317c184ecdSChristoph Hellwig 6327c184ecdSChristoph Hellwig written = xwrite(fd, (char *)initrd_start, initrd_end - initrd_start); 6337c184ecdSChristoph Hellwig if (written != initrd_end - initrd_start) 6347c184ecdSChristoph Hellwig pr_err("/initrd.image: incomplete write (%zd != %ld)\n", 6357c184ecdSChristoph Hellwig written, initrd_end - initrd_start); 6367c184ecdSChristoph Hellwig ksys_close(fd); 6377c184ecdSChristoph Hellwig } 638afef7889SChristoph Hellwig #else 639afef7889SChristoph Hellwig static void populate_initrd_image(char *err) 640afef7889SChristoph Hellwig { 641afef7889SChristoph Hellwig printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err); 642afef7889SChristoph Hellwig } 6437c184ecdSChristoph Hellwig #endif /* CONFIG_BLK_DEV_RAM */ 6447c184ecdSChristoph Hellwig 6459a9e0d68SLinus Torvalds static int __init populate_rootfs(void) 6461da177e4SLinus Torvalds { 64717a9be31SStafford Horne /* Load the built in initramfs */ 648ffe8018cSHendrik Brueckner char *err = unpack_to_rootfs(__initramfs_start, __initramfs_size); 6491da177e4SLinus Torvalds if (err) 650499a4584STetsuo Handa panic("%s", err); /* Failed to decompress INTERNAL initramfs */ 651afef7889SChristoph Hellwig 652afef7889SChristoph Hellwig if (!initrd_start || IS_ENABLED(CONFIG_INITRAMFS_FORCE)) 653bb813f4cSTejun Heo goto done; 65454c7a891SChristoph Hellwig 655afef7889SChristoph Hellwig if (IS_ENABLED(CONFIG_BLK_DEV_RAM)) 656afef7889SChristoph Hellwig printk(KERN_INFO "Trying to unpack rootfs image as initramfs...\n"); 657afef7889SChristoph Hellwig else 658afef7889SChristoph Hellwig printk(KERN_INFO "Unpacking initramfs...\n"); 659afef7889SChristoph Hellwig 660afef7889SChristoph Hellwig err = unpack_to_rootfs((char *)initrd_start, initrd_end - initrd_start); 661afef7889SChristoph Hellwig if (err) { 662df52092fSLi, Shaohua clean_rootfs(); 6637c184ecdSChristoph Hellwig populate_initrd_image(err); 66417a9be31SStafford Horne } 66523091e28SChristoph Hellwig 666afef7889SChristoph Hellwig done: 66723091e28SChristoph Hellwig /* 66823091e28SChristoph Hellwig * If the initrd region is overlapped with crashkernel reserved region, 66923091e28SChristoph Hellwig * free only memory that is not part of crashkernel region. 67023091e28SChristoph Hellwig */ 67123091e28SChristoph Hellwig if (!do_retain_initrd && !kexec_free_initrd()) 67223091e28SChristoph Hellwig free_initrd_mem(initrd_start, initrd_end); 67323091e28SChristoph Hellwig initrd_start = 0; 67423091e28SChristoph Hellwig initrd_end = 0; 67523091e28SChristoph Hellwig 67608865514SLokesh Vutla flush_delayed_fput(); 6778d610dd5SLinus Torvalds return 0; 6781da177e4SLinus Torvalds } 6798d610dd5SLinus Torvalds rootfs_initcall(populate_rootfs); 680