1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0 21da177e4SLinus Torvalds #include <linux/init.h> 3e7cb072eSRasmus Villemoes #include <linux/async.h> 41da177e4SLinus Torvalds #include <linux/fs.h> 51da177e4SLinus Torvalds #include <linux/slab.h> 61da177e4SLinus Torvalds #include <linux/types.h> 71da177e4SLinus Torvalds #include <linux/fcntl.h> 81da177e4SLinus Torvalds #include <linux/delay.h> 91da177e4SLinus Torvalds #include <linux/string.h> 10df52092fSLi, Shaohua #include <linux/dirent.h> 111da177e4SLinus Torvalds #include <linux/syscalls.h> 12889d51a1SNye Liu #include <linux/utime.h> 1308865514SLokesh Vutla #include <linux/file.h> 14899ee4afSMike Rapoport #include <linux/memblock.h> 15dd23e809SFlorian Fainelli #include <linux/mm.h> 16b2a74d5fSChristoph Hellwig #include <linux/namei.h> 178fb9f73eSChristoph Hellwig #include <linux/init_syscalls.h> 18b234ed6dSRasmus Villemoes #include <linux/umh.h> 191da177e4SLinus Torvalds 20*800c24dcSDavid Disseldorp static __initdata bool csum_present; 21*800c24dcSDavid Disseldorp static __initdata u32 io_csum; 22*800c24dcSDavid Disseldorp 23*800c24dcSDavid Disseldorp static ssize_t __init xwrite(struct file *file, const unsigned char *p, 24*800c24dcSDavid Disseldorp size_t count, loff_t *pos) 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) { 30bf6419e4SChristoph Hellwig ssize_t rv = kernel_write(file, p, count, pos); 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 39*800c24dcSDavid Disseldorp if (csum_present) { 40*800c24dcSDavid Disseldorp ssize_t i; 41*800c24dcSDavid Disseldorp 42*800c24dcSDavid Disseldorp for (i = 0; i < rv; i++) 43*800c24dcSDavid Disseldorp io_csum += p[i]; 44*800c24dcSDavid Disseldorp } 45*800c24dcSDavid Disseldorp 4638747439SYinghai Lu p += rv; 4738747439SYinghai Lu out += rv; 4838747439SYinghai Lu count -= rv; 4938747439SYinghai Lu } 5038747439SYinghai Lu 5138747439SYinghai Lu return out; 5238747439SYinghai Lu } 5338747439SYinghai Lu 541da177e4SLinus Torvalds static __initdata char *message; 551da177e4SLinus Torvalds static void __init error(char *x) 561da177e4SLinus Torvalds { 571da177e4SLinus Torvalds if (!message) 581da177e4SLinus Torvalds message = x; 591da177e4SLinus Torvalds } 601da177e4SLinus Torvalds 61dd23e809SFlorian Fainelli static void panic_show_mem(const char *fmt, ...) 62dd23e809SFlorian Fainelli { 63dd23e809SFlorian Fainelli va_list args; 64dd23e809SFlorian Fainelli 65dd23e809SFlorian Fainelli show_mem(0, NULL); 66dd23e809SFlorian Fainelli va_start(args, fmt); 67dd23e809SFlorian Fainelli panic(fmt, args); 68dd23e809SFlorian Fainelli va_end(args); 69dd23e809SFlorian Fainelli } 70dd23e809SFlorian Fainelli 711da177e4SLinus Torvalds /* link hash */ 721da177e4SLinus Torvalds 736a050da4SMark Huang #define N_ALIGN(len) ((((len) + 1) & ~3) + 2) 746a050da4SMark Huang 751da177e4SLinus Torvalds static __initdata struct hash { 761da177e4SLinus Torvalds int ino, minor, major; 77685dd2d5SAl Viro umode_t mode; 781da177e4SLinus Torvalds struct hash *next; 796a050da4SMark Huang char name[N_ALIGN(PATH_MAX)]; 801da177e4SLinus Torvalds } *head[32]; 811da177e4SLinus Torvalds 821da177e4SLinus Torvalds static inline int hash(int major, int minor, int ino) 831da177e4SLinus Torvalds { 841da177e4SLinus Torvalds unsigned long tmp = ino + minor + (major << 3); 851da177e4SLinus Torvalds tmp += tmp >> 5; 861da177e4SLinus Torvalds return tmp & 31; 871da177e4SLinus Torvalds } 881da177e4SLinus Torvalds 892139a7fbSH. Peter Anvin static char __init *find_link(int major, int minor, int ino, 90685dd2d5SAl Viro umode_t mode, char *name) 911da177e4SLinus Torvalds { 921da177e4SLinus Torvalds struct hash **p, *q; 931da177e4SLinus Torvalds for (p = head + hash(major, minor, ino); *p; p = &(*p)->next) { 941da177e4SLinus Torvalds if ((*p)->ino != ino) 951da177e4SLinus Torvalds continue; 961da177e4SLinus Torvalds if ((*p)->minor != minor) 971da177e4SLinus Torvalds continue; 981da177e4SLinus Torvalds if ((*p)->major != major) 991da177e4SLinus Torvalds continue; 1002139a7fbSH. Peter Anvin if (((*p)->mode ^ mode) & S_IFMT) 1012139a7fbSH. Peter Anvin continue; 1021da177e4SLinus Torvalds return (*p)->name; 1031da177e4SLinus Torvalds } 1043265e66bSThomas Petazzoni q = kmalloc(sizeof(struct hash), GFP_KERNEL); 1051da177e4SLinus Torvalds if (!q) 106dd23e809SFlorian Fainelli panic_show_mem("can't allocate link hash entry"); 1071da177e4SLinus Torvalds q->major = major; 1082139a7fbSH. Peter Anvin q->minor = minor; 1092139a7fbSH. Peter Anvin q->ino = ino; 1102139a7fbSH. Peter Anvin q->mode = mode; 1116a050da4SMark Huang strcpy(q->name, name); 1121da177e4SLinus Torvalds q->next = NULL; 1131da177e4SLinus Torvalds *p = q; 1141da177e4SLinus Torvalds return NULL; 1151da177e4SLinus Torvalds } 1161da177e4SLinus Torvalds 1171da177e4SLinus Torvalds static void __init free_hash(void) 1181da177e4SLinus Torvalds { 1191da177e4SLinus Torvalds struct hash **p, *q; 1201da177e4SLinus Torvalds for (p = head; p < head + 32; p++) { 1211da177e4SLinus Torvalds while (*p) { 1221da177e4SLinus Torvalds q = *p; 1231da177e4SLinus Torvalds *p = q->next; 1243265e66bSThomas Petazzoni kfree(q); 1251da177e4SLinus Torvalds } 1261da177e4SLinus Torvalds } 1271da177e4SLinus Torvalds } 1281da177e4SLinus Torvalds 1291274aea1SDavid Disseldorp #ifdef CONFIG_INITRAMFS_PRESERVE_MTIME 1301274aea1SDavid Disseldorp static void __init do_utime(char *filename, time64_t mtime) 131889d51a1SNye Liu { 1321274aea1SDavid Disseldorp struct timespec64 t[2] = { { .tv_sec = mtime }, { .tv_sec = mtime } }; 1331274aea1SDavid Disseldorp init_utimes(filename, t); 1341274aea1SDavid Disseldorp } 135889d51a1SNye Liu 1361274aea1SDavid Disseldorp static void __init do_utime_path(const struct path *path, time64_t mtime) 1371274aea1SDavid Disseldorp { 1381274aea1SDavid Disseldorp struct timespec64 t[2] = { { .tv_sec = mtime }, { .tv_sec = mtime } }; 1391274aea1SDavid Disseldorp vfs_utimes(path, t); 140889d51a1SNye Liu } 141889d51a1SNye Liu 142889d51a1SNye Liu static __initdata LIST_HEAD(dir_list); 143889d51a1SNye Liu struct dir_entry { 144889d51a1SNye Liu struct list_head list; 145e35c4c64SArnd Bergmann time64_t mtime; 146fcb7aeddSDavid Disseldorp char name[]; 147889d51a1SNye Liu }; 148889d51a1SNye Liu 149e35c4c64SArnd Bergmann static void __init dir_add(const char *name, time64_t mtime) 150889d51a1SNye Liu { 151fcb7aeddSDavid Disseldorp size_t nlen = strlen(name) + 1; 152fcb7aeddSDavid Disseldorp struct dir_entry *de; 153fcb7aeddSDavid Disseldorp 154fcb7aeddSDavid Disseldorp de = kmalloc(sizeof(struct dir_entry) + nlen, GFP_KERNEL); 155889d51a1SNye Liu if (!de) 156dd23e809SFlorian Fainelli panic_show_mem("can't allocate dir_entry buffer"); 157889d51a1SNye Liu INIT_LIST_HEAD(&de->list); 158fcb7aeddSDavid Disseldorp strscpy(de->name, name, nlen); 159889d51a1SNye Liu de->mtime = mtime; 160889d51a1SNye Liu list_add(&de->list, &dir_list); 161889d51a1SNye Liu } 162889d51a1SNye Liu 163889d51a1SNye Liu static void __init dir_utime(void) 164889d51a1SNye Liu { 165889d51a1SNye Liu struct dir_entry *de, *tmp; 166889d51a1SNye Liu list_for_each_entry_safe(de, tmp, &dir_list, list) { 167889d51a1SNye Liu list_del(&de->list); 168889d51a1SNye Liu do_utime(de->name, de->mtime); 169889d51a1SNye Liu kfree(de); 170889d51a1SNye Liu } 171889d51a1SNye Liu } 1721274aea1SDavid Disseldorp #else 1731274aea1SDavid Disseldorp static void __init do_utime(char *filename, time64_t mtime) {} 1741274aea1SDavid Disseldorp static void __init do_utime_path(const struct path *path, time64_t mtime) {} 1751274aea1SDavid Disseldorp static void __init dir_add(const char *name, time64_t mtime) {} 1761274aea1SDavid Disseldorp static void __init dir_utime(void) {} 1771274aea1SDavid Disseldorp #endif 178889d51a1SNye Liu 179e35c4c64SArnd Bergmann static __initdata time64_t mtime; 180889d51a1SNye Liu 1811da177e4SLinus Torvalds /* cpio header parsing */ 1821da177e4SLinus Torvalds 1831da177e4SLinus Torvalds static __initdata unsigned long ino, major, minor, nlink; 184685dd2d5SAl Viro static __initdata umode_t mode; 1851da177e4SLinus Torvalds static __initdata unsigned long body_len, name_len; 1861da177e4SLinus Torvalds static __initdata uid_t uid; 1871da177e4SLinus Torvalds static __initdata gid_t gid; 1881da177e4SLinus Torvalds static __initdata unsigned rdev; 189*800c24dcSDavid Disseldorp static __initdata u32 hdr_csum; 1901da177e4SLinus Torvalds 1911da177e4SLinus Torvalds static void __init parse_header(char *s) 1921da177e4SLinus Torvalds { 193*800c24dcSDavid Disseldorp unsigned long parsed[13]; 1941da177e4SLinus Torvalds char buf[9]; 1951da177e4SLinus Torvalds int i; 1961da177e4SLinus Torvalds 1971da177e4SLinus Torvalds buf[8] = '\0'; 198*800c24dcSDavid Disseldorp for (i = 0, s += 6; i < 13; i++, s += 8) { 1991da177e4SLinus Torvalds memcpy(buf, s, 8); 2001da177e4SLinus Torvalds parsed[i] = simple_strtoul(buf, NULL, 16); 2011da177e4SLinus Torvalds } 2021da177e4SLinus Torvalds ino = parsed[0]; 2031da177e4SLinus Torvalds mode = parsed[1]; 2041da177e4SLinus Torvalds uid = parsed[2]; 2051da177e4SLinus Torvalds gid = parsed[3]; 2061da177e4SLinus Torvalds nlink = parsed[4]; 207e35c4c64SArnd Bergmann mtime = parsed[5]; /* breaks in y2106 */ 2081da177e4SLinus Torvalds body_len = parsed[6]; 2091da177e4SLinus Torvalds major = parsed[7]; 2101da177e4SLinus Torvalds minor = parsed[8]; 2111da177e4SLinus Torvalds rdev = new_encode_dev(MKDEV(parsed[9], parsed[10])); 2121da177e4SLinus Torvalds name_len = parsed[11]; 213*800c24dcSDavid Disseldorp hdr_csum = parsed[12]; 2141da177e4SLinus Torvalds } 2151da177e4SLinus Torvalds 2161da177e4SLinus Torvalds /* FSM */ 2171da177e4SLinus Torvalds 2181da177e4SLinus Torvalds static __initdata enum state { 2191da177e4SLinus Torvalds Start, 2201da177e4SLinus Torvalds Collect, 2211da177e4SLinus Torvalds GotHeader, 2221da177e4SLinus Torvalds SkipIt, 2231da177e4SLinus Torvalds GotName, 2241da177e4SLinus Torvalds CopyFile, 2251da177e4SLinus Torvalds GotSymlink, 2261da177e4SLinus Torvalds Reset 2271da177e4SLinus Torvalds } state, next_state; 2281da177e4SLinus Torvalds 2291da177e4SLinus Torvalds static __initdata char *victim; 230c34d85acSMark Rustad static unsigned long byte_count __initdata; 2311da177e4SLinus Torvalds static __initdata loff_t this_header, next_header; 2321da177e4SLinus Torvalds 233b0a5ab93SAl Viro static inline void __init eat(unsigned n) 2341da177e4SLinus Torvalds { 2351da177e4SLinus Torvalds victim += n; 2361da177e4SLinus Torvalds this_header += n; 237c34d85acSMark Rustad byte_count -= n; 2381da177e4SLinus Torvalds } 2391da177e4SLinus Torvalds 2401da177e4SLinus Torvalds static __initdata char *collected; 241d97b07c5SYinghai Lu static long remains __initdata; 2421da177e4SLinus Torvalds static __initdata char *collect; 2431da177e4SLinus Torvalds 2441da177e4SLinus Torvalds static void __init read_into(char *buf, unsigned size, enum state next) 2451da177e4SLinus Torvalds { 246c34d85acSMark Rustad if (byte_count >= size) { 2471da177e4SLinus Torvalds collected = victim; 2481da177e4SLinus Torvalds eat(size); 2491da177e4SLinus Torvalds state = next; 2501da177e4SLinus Torvalds } else { 2511da177e4SLinus Torvalds collect = collected = buf; 2521da177e4SLinus Torvalds remains = size; 2531da177e4SLinus Torvalds next_state = next; 2541da177e4SLinus Torvalds state = Collect; 2551da177e4SLinus Torvalds } 2561da177e4SLinus Torvalds } 2571da177e4SLinus Torvalds 2581da177e4SLinus Torvalds static __initdata char *header_buf, *symlink_buf, *name_buf; 2591da177e4SLinus Torvalds 2601da177e4SLinus Torvalds static int __init do_start(void) 2611da177e4SLinus Torvalds { 2621da177e4SLinus Torvalds read_into(header_buf, 110, GotHeader); 2631da177e4SLinus Torvalds return 0; 2641da177e4SLinus Torvalds } 2651da177e4SLinus Torvalds 2661da177e4SLinus Torvalds static int __init do_collect(void) 2671da177e4SLinus Torvalds { 268d97b07c5SYinghai Lu unsigned long n = remains; 269c34d85acSMark Rustad if (byte_count < n) 270c34d85acSMark Rustad n = byte_count; 2711da177e4SLinus Torvalds memcpy(collect, victim, n); 2721da177e4SLinus Torvalds eat(n); 2731da177e4SLinus Torvalds collect += n; 2741da177e4SLinus Torvalds if ((remains -= n) != 0) 2751da177e4SLinus Torvalds return 1; 2761da177e4SLinus Torvalds state = next_state; 2771da177e4SLinus Torvalds return 0; 2781da177e4SLinus Torvalds } 2791da177e4SLinus Torvalds 2801da177e4SLinus Torvalds static int __init do_header(void) 2811da177e4SLinus Torvalds { 282*800c24dcSDavid Disseldorp if (!memcmp(collected, "070701", 6)) { 283*800c24dcSDavid Disseldorp csum_present = false; 284*800c24dcSDavid Disseldorp } else if (!memcmp(collected, "070702", 6)) { 285*800c24dcSDavid Disseldorp csum_present = true; 286*800c24dcSDavid Disseldorp } else { 287da028e4cSDavid Disseldorp if (memcmp(collected, "070707", 6) == 0) 288da028e4cSDavid Disseldorp error("incorrect cpio method used: use -H newc option"); 289da028e4cSDavid Disseldorp else 2901da177e4SLinus Torvalds error("no cpio magic"); 2911da177e4SLinus Torvalds return 1; 2921da177e4SLinus Torvalds } 2931da177e4SLinus Torvalds parse_header(collected); 2941da177e4SLinus Torvalds next_header = this_header + N_ALIGN(name_len) + body_len; 2951da177e4SLinus Torvalds next_header = (next_header + 3) & ~3; 2961da177e4SLinus Torvalds state = SkipIt; 2971da177e4SLinus Torvalds if (name_len <= 0 || name_len > PATH_MAX) 2981da177e4SLinus Torvalds return 0; 2991da177e4SLinus Torvalds if (S_ISLNK(mode)) { 3001da177e4SLinus Torvalds if (body_len > PATH_MAX) 3011da177e4SLinus Torvalds return 0; 3021da177e4SLinus Torvalds collect = collected = symlink_buf; 3031da177e4SLinus Torvalds remains = N_ALIGN(name_len) + body_len; 3041da177e4SLinus Torvalds next_state = GotSymlink; 3051da177e4SLinus Torvalds state = Collect; 3061da177e4SLinus Torvalds return 0; 3071da177e4SLinus Torvalds } 3081da177e4SLinus Torvalds if (S_ISREG(mode) || !body_len) 3091da177e4SLinus Torvalds read_into(name_buf, N_ALIGN(name_len), GotName); 3101da177e4SLinus Torvalds return 0; 3111da177e4SLinus Torvalds } 3121da177e4SLinus Torvalds 3131da177e4SLinus Torvalds static int __init do_skip(void) 3141da177e4SLinus Torvalds { 315c34d85acSMark Rustad if (this_header + byte_count < next_header) { 316c34d85acSMark Rustad eat(byte_count); 3171da177e4SLinus Torvalds return 1; 3181da177e4SLinus Torvalds } else { 3191da177e4SLinus Torvalds eat(next_header - this_header); 3201da177e4SLinus Torvalds state = next_state; 3211da177e4SLinus Torvalds return 0; 3221da177e4SLinus Torvalds } 3231da177e4SLinus Torvalds } 3241da177e4SLinus Torvalds 3251da177e4SLinus Torvalds static int __init do_reset(void) 3261da177e4SLinus Torvalds { 327c34d85acSMark Rustad while (byte_count && *victim == '\0') 3281da177e4SLinus Torvalds eat(1); 329c34d85acSMark Rustad if (byte_count && (this_header & 3)) 3301da177e4SLinus Torvalds error("broken padding"); 3311da177e4SLinus Torvalds return 1; 3321da177e4SLinus Torvalds } 3331da177e4SLinus Torvalds 334c34d85acSMark Rustad static void __init clean_path(char *path, umode_t fmode) 3352139a7fbSH. Peter Anvin { 336046aa126SArnd Bergmann struct kstat st; 3372139a7fbSH. Peter Anvin 3387b81ce7cSBarret Rhoden if (!init_stat(path, &st, AT_SYMLINK_NOFOLLOW) && 339716308a5SChristoph Hellwig (st.mode ^ fmode) & S_IFMT) { 340046aa126SArnd Bergmann if (S_ISDIR(st.mode)) 34120cce026SChristoph Hellwig init_rmdir(path); 3422139a7fbSH. Peter Anvin else 3438fb9f73eSChristoph Hellwig init_unlink(path); 3442139a7fbSH. Peter Anvin } 3452139a7fbSH. Peter Anvin } 3462139a7fbSH. Peter Anvin 3477c0950d4SLi Zhijian static int __init maybe_link(void) 3487c0950d4SLi Zhijian { 3497c0950d4SLi Zhijian if (nlink >= 2) { 3507c0950d4SLi Zhijian char *old = find_link(major, minor, ino, mode, collected); 3517c0950d4SLi Zhijian if (old) { 3527c0950d4SLi Zhijian clean_path(collected, 0); 353812931d6SChristoph Hellwig return (init_link(old, collected) < 0) ? -1 : 1; 3547c0950d4SLi Zhijian } 3557c0950d4SLi Zhijian } 3567c0950d4SLi Zhijian return 0; 3577c0950d4SLi Zhijian } 3587c0950d4SLi Zhijian 359bf6419e4SChristoph Hellwig static __initdata struct file *wfile; 360bf6419e4SChristoph Hellwig static __initdata loff_t wfile_pos; 3611da177e4SLinus Torvalds 3621da177e4SLinus Torvalds static int __init do_name(void) 3631da177e4SLinus Torvalds { 3641da177e4SLinus Torvalds state = SkipIt; 3651da177e4SLinus Torvalds next_state = Reset; 3661da177e4SLinus Torvalds if (strcmp(collected, "TRAILER!!!") == 0) { 3671da177e4SLinus Torvalds free_hash(); 3681da177e4SLinus Torvalds return 0; 3691da177e4SLinus Torvalds } 3702139a7fbSH. Peter Anvin clean_path(collected, mode); 3711da177e4SLinus Torvalds if (S_ISREG(mode)) { 3722139a7fbSH. Peter Anvin int ml = maybe_link(); 3732139a7fbSH. Peter Anvin if (ml >= 0) { 3742139a7fbSH. Peter Anvin int openflags = O_WRONLY|O_CREAT; 3752139a7fbSH. Peter Anvin if (ml != 1) 3762139a7fbSH. Peter Anvin openflags |= O_TRUNC; 377bf6419e4SChristoph Hellwig wfile = filp_open(collected, openflags, mode); 378bf6419e4SChristoph Hellwig if (IS_ERR(wfile)) 379bf6419e4SChristoph Hellwig return 0; 380bf6419e4SChristoph Hellwig wfile_pos = 0; 381*800c24dcSDavid Disseldorp io_csum = 0; 3822139a7fbSH. Peter Anvin 383bf6419e4SChristoph Hellwig vfs_fchown(wfile, uid, gid); 384bf6419e4SChristoph Hellwig vfs_fchmod(wfile, mode); 385d20d5a74SRandy Robertson if (body_len) 386bf6419e4SChristoph Hellwig vfs_truncate(&wfile->f_path, body_len); 3871da177e4SLinus Torvalds state = CopyFile; 3881da177e4SLinus Torvalds } 3891da177e4SLinus Torvalds } else if (S_ISDIR(mode)) { 39083ff98c3SChristoph Hellwig init_mkdir(collected, mode); 391b873498fSChristoph Hellwig init_chown(collected, uid, gid, 0); 3921097742eSChristoph Hellwig init_chmod(collected, mode); 393889d51a1SNye Liu dir_add(collected, mtime); 3941da177e4SLinus Torvalds } else if (S_ISBLK(mode) || S_ISCHR(mode) || 3951da177e4SLinus Torvalds S_ISFIFO(mode) || S_ISSOCK(mode)) { 3961da177e4SLinus Torvalds if (maybe_link() == 0) { 3975fee64fcSChristoph Hellwig init_mknod(collected, mode, rdev); 398b873498fSChristoph Hellwig init_chown(collected, uid, gid, 0); 3991097742eSChristoph Hellwig init_chmod(collected, mode); 400889d51a1SNye Liu do_utime(collected, mtime); 4011da177e4SLinus Torvalds } 4021da177e4SLinus Torvalds } 4031da177e4SLinus Torvalds return 0; 4041da177e4SLinus Torvalds } 4051da177e4SLinus Torvalds 4061da177e4SLinus Torvalds static int __init do_copy(void) 4071da177e4SLinus Torvalds { 408c34d85acSMark Rustad if (byte_count >= body_len) { 409bf6419e4SChristoph Hellwig if (xwrite(wfile, victim, body_len, &wfile_pos) != body_len) 4109687fd91SDavid Engraf error("write error"); 41138b08223SChristoph Hellwig 4121274aea1SDavid Disseldorp do_utime_path(&wfile->f_path, mtime); 413bf6419e4SChristoph Hellwig fput(wfile); 414*800c24dcSDavid Disseldorp if (csum_present && io_csum != hdr_csum) 415*800c24dcSDavid Disseldorp error("bad data checksum"); 4161da177e4SLinus Torvalds eat(body_len); 4171da177e4SLinus Torvalds state = SkipIt; 4181da177e4SLinus Torvalds return 0; 4191da177e4SLinus Torvalds } else { 420bf6419e4SChristoph Hellwig if (xwrite(wfile, victim, byte_count, &wfile_pos) != byte_count) 4219687fd91SDavid Engraf error("write error"); 422c34d85acSMark Rustad body_len -= byte_count; 423c34d85acSMark Rustad eat(byte_count); 4241da177e4SLinus Torvalds return 1; 4251da177e4SLinus Torvalds } 4261da177e4SLinus Torvalds } 4271da177e4SLinus Torvalds 4281da177e4SLinus Torvalds static int __init do_symlink(void) 4291da177e4SLinus Torvalds { 4301da177e4SLinus Torvalds collected[N_ALIGN(name_len) + body_len] = '\0'; 4312139a7fbSH. Peter Anvin clean_path(collected, 0); 432cd3acb6aSChristoph Hellwig init_symlink(collected + N_ALIGN(name_len), collected); 433b873498fSChristoph Hellwig init_chown(collected, uid, gid, AT_SYMLINK_NOFOLLOW); 434889d51a1SNye Liu do_utime(collected, mtime); 4351da177e4SLinus Torvalds state = SkipIt; 4361da177e4SLinus Torvalds next_state = Reset; 4371da177e4SLinus Torvalds return 0; 4381da177e4SLinus Torvalds } 4391da177e4SLinus Torvalds 4401da177e4SLinus Torvalds static __initdata int (*actions[])(void) = { 4411da177e4SLinus Torvalds [Start] = do_start, 4421da177e4SLinus Torvalds [Collect] = do_collect, 4431da177e4SLinus Torvalds [GotHeader] = do_header, 4441da177e4SLinus Torvalds [SkipIt] = do_skip, 4451da177e4SLinus Torvalds [GotName] = do_name, 4461da177e4SLinus Torvalds [CopyFile] = do_copy, 4471da177e4SLinus Torvalds [GotSymlink] = do_symlink, 4481da177e4SLinus Torvalds [Reset] = do_reset, 4491da177e4SLinus Torvalds }; 4501da177e4SLinus Torvalds 451d97b07c5SYinghai Lu static long __init write_buffer(char *buf, unsigned long len) 4521da177e4SLinus Torvalds { 453c34d85acSMark Rustad byte_count = len; 4541da177e4SLinus Torvalds victim = buf; 4551da177e4SLinus Torvalds 4561da177e4SLinus Torvalds while (!actions[state]()) 4571da177e4SLinus Torvalds ; 458c34d85acSMark Rustad return len - byte_count; 4591da177e4SLinus Torvalds } 4601da177e4SLinus Torvalds 461d97b07c5SYinghai Lu static long __init flush_buffer(void *bufv, unsigned long len) 4621da177e4SLinus Torvalds { 46330d65dbfSAlain Knaff char *buf = (char *) bufv; 464d97b07c5SYinghai Lu long written; 465d97b07c5SYinghai Lu long origLen = len; 4661da177e4SLinus Torvalds if (message) 46730d65dbfSAlain Knaff return -1; 4681da177e4SLinus Torvalds while ((written = write_buffer(buf, len)) < len && !message) { 4691da177e4SLinus Torvalds char c = buf[written]; 4701da177e4SLinus Torvalds if (c == '0') { 4711da177e4SLinus Torvalds buf += written; 4721da177e4SLinus Torvalds len -= written; 4731da177e4SLinus Torvalds state = Start; 4741da177e4SLinus Torvalds } else if (c == 0) { 4751da177e4SLinus Torvalds buf += written; 4761da177e4SLinus Torvalds len -= written; 4771da177e4SLinus Torvalds state = Reset; 4781da177e4SLinus Torvalds } else 479e5eed351SDavid Engraf error("junk within compressed archive"); 4801da177e4SLinus Torvalds } 48130d65dbfSAlain Knaff return origLen; 4821da177e4SLinus Torvalds } 4831da177e4SLinus Torvalds 484d97b07c5SYinghai Lu static unsigned long my_inptr; /* index of next byte to be processed in inbuf */ 4851da177e4SLinus Torvalds 486889c92d2SH. Peter Anvin #include <linux/decompress/generic.h> 4871da177e4SLinus Torvalds 488d97b07c5SYinghai Lu static char * __init unpack_to_rootfs(char *buf, unsigned long len) 4891da177e4SLinus Torvalds { 490d97b07c5SYinghai Lu long written; 491889c92d2SH. Peter Anvin decompress_fn decompress; 49223a22d57SH. Peter Anvin const char *compress_name; 49323a22d57SH. Peter Anvin static __initdata char msg_buf[64]; 494889c92d2SH. Peter Anvin 4953265e66bSThomas Petazzoni header_buf = kmalloc(110, GFP_KERNEL); 4963265e66bSThomas Petazzoni symlink_buf = kmalloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1, GFP_KERNEL); 4973265e66bSThomas Petazzoni name_buf = kmalloc(N_ALIGN(PATH_MAX), GFP_KERNEL); 49830d65dbfSAlain Knaff 49930d65dbfSAlain Knaff if (!header_buf || !symlink_buf || !name_buf) 500dd23e809SFlorian Fainelli panic_show_mem("can't allocate buffers"); 50130d65dbfSAlain Knaff 5021da177e4SLinus Torvalds state = Start; 5031da177e4SLinus Torvalds this_header = 0; 5041da177e4SLinus Torvalds message = NULL; 5051da177e4SLinus Torvalds while (!message && len) { 5061da177e4SLinus Torvalds loff_t saved_offset = this_header; 5071da177e4SLinus Torvalds if (*buf == '0' && !(this_header & 3)) { 5081da177e4SLinus Torvalds state = Start; 5091da177e4SLinus Torvalds written = write_buffer(buf, len); 5101da177e4SLinus Torvalds buf += written; 5111da177e4SLinus Torvalds len -= written; 5121da177e4SLinus Torvalds continue; 5131da177e4SLinus Torvalds } 5141da177e4SLinus Torvalds if (!*buf) { 5151da177e4SLinus Torvalds buf++; 5161da177e4SLinus Torvalds len--; 5171da177e4SLinus Torvalds this_header++; 5181da177e4SLinus Torvalds continue; 5191da177e4SLinus Torvalds } 5201da177e4SLinus Torvalds this_header = 0; 52123a22d57SH. Peter Anvin decompress = decompress_method(buf, len, &compress_name); 5226aa7a29aSDaniel M. Weeks pr_debug("Detected %s compressed data\n", compress_name); 52354291362SPhillip Lougher if (decompress) { 524d97b07c5SYinghai Lu int res = decompress(buf, len, NULL, flush_buffer, NULL, 525889c92d2SH. Peter Anvin &my_inptr, error); 52654291362SPhillip Lougher if (res) 52754291362SPhillip Lougher error("decompressor failed"); 52854291362SPhillip Lougher } else if (compress_name) { 52923a22d57SH. Peter Anvin if (!message) { 53023a22d57SH. Peter Anvin snprintf(msg_buf, sizeof msg_buf, 53123a22d57SH. Peter Anvin "compression method %s not configured", 53223a22d57SH. Peter Anvin compress_name); 53323a22d57SH. Peter Anvin message = msg_buf; 53423a22d57SH. Peter Anvin } 535df37bd15SPhillip Lougher } else 536e5eed351SDavid Engraf error("invalid magic at start of compressed archive"); 5371da177e4SLinus Torvalds if (state != Reset) 538e5eed351SDavid Engraf error("junk at the end of compressed archive"); 53930d65dbfSAlain Knaff this_header = saved_offset + my_inptr; 54030d65dbfSAlain Knaff buf += my_inptr; 54130d65dbfSAlain Knaff len -= my_inptr; 5421da177e4SLinus Torvalds } 543889d51a1SNye Liu dir_utime(); 5443265e66bSThomas Petazzoni kfree(name_buf); 5453265e66bSThomas Petazzoni kfree(symlink_buf); 5463265e66bSThomas Petazzoni kfree(header_buf); 5471da177e4SLinus Torvalds return message; 5481da177e4SLinus Torvalds } 5491da177e4SLinus Torvalds 5500a7b35cbSMichael Neuling static int __initdata do_retain_initrd; 5510a7b35cbSMichael Neuling 5520a7b35cbSMichael Neuling static int __init retain_initrd_param(char *str) 5530a7b35cbSMichael Neuling { 5540a7b35cbSMichael Neuling if (*str) 5550a7b35cbSMichael Neuling return 0; 5560a7b35cbSMichael Neuling do_retain_initrd = 1; 5570a7b35cbSMichael Neuling return 1; 5580a7b35cbSMichael Neuling } 5590a7b35cbSMichael Neuling __setup("retain_initrd", retain_initrd_param); 5600a7b35cbSMichael Neuling 561d8ae8a37SChristoph Hellwig #ifdef CONFIG_ARCH_HAS_KEEPINITRD 562d8ae8a37SChristoph Hellwig static int __init keepinitrd_setup(char *__unused) 563d8ae8a37SChristoph Hellwig { 564d8ae8a37SChristoph Hellwig do_retain_initrd = 1; 565d8ae8a37SChristoph Hellwig return 1; 566d8ae8a37SChristoph Hellwig } 567d8ae8a37SChristoph Hellwig __setup("keepinitrd", keepinitrd_setup); 568d8ae8a37SChristoph Hellwig #endif 569d8ae8a37SChristoph Hellwig 570e7cb072eSRasmus Villemoes static bool __initdata initramfs_async = true; 571e7cb072eSRasmus Villemoes static int __init initramfs_async_setup(char *str) 572e7cb072eSRasmus Villemoes { 573e7cb072eSRasmus Villemoes strtobool(str, &initramfs_async); 574e7cb072eSRasmus Villemoes return 1; 575e7cb072eSRasmus Villemoes } 576e7cb072eSRasmus Villemoes __setup("initramfs_async=", initramfs_async_setup); 577e7cb072eSRasmus Villemoes 578ffe8018cSHendrik Brueckner extern char __initramfs_start[]; 579ffe8018cSHendrik Brueckner extern unsigned long __initramfs_size; 5801da177e4SLinus Torvalds #include <linux/initrd.h> 5819c15e852SHaren Myneni #include <linux/kexec.h> 5820f3d2bd5SJan Beulich 583c72160feSKefeng Wang void __init reserve_initrd_mem(void) 584c72160feSKefeng Wang { 585c72160feSKefeng Wang phys_addr_t start; 586c72160feSKefeng Wang unsigned long size; 587c72160feSKefeng Wang 588c72160feSKefeng Wang /* Ignore the virtul address computed during device tree parsing */ 589c72160feSKefeng Wang initrd_start = initrd_end = 0; 590c72160feSKefeng Wang 591c72160feSKefeng Wang if (!phys_initrd_size) 592c72160feSKefeng Wang return; 593c72160feSKefeng Wang /* 594c72160feSKefeng Wang * Round the memory region to page boundaries as per free_initrd_mem() 595c72160feSKefeng Wang * This allows us to detect whether the pages overlapping the initrd 596c72160feSKefeng Wang * are in use, but more importantly, reserves the entire set of pages 597c72160feSKefeng Wang * as we don't want these pages allocated for other purposes. 598c72160feSKefeng Wang */ 599c72160feSKefeng Wang start = round_down(phys_initrd_start, PAGE_SIZE); 600c72160feSKefeng Wang size = phys_initrd_size + (phys_initrd_start - start); 601c72160feSKefeng Wang size = round_up(size, PAGE_SIZE); 602c72160feSKefeng Wang 603c72160feSKefeng Wang if (!memblock_is_region_memory(start, size)) { 604c72160feSKefeng Wang pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region", 605c72160feSKefeng Wang (u64)start, size); 606c72160feSKefeng Wang goto disable; 607c72160feSKefeng Wang } 608c72160feSKefeng Wang 609c72160feSKefeng Wang if (memblock_is_region_reserved(start, size)) { 610c72160feSKefeng Wang pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region\n", 611c72160feSKefeng Wang (u64)start, size); 612c72160feSKefeng Wang goto disable; 613c72160feSKefeng Wang } 614c72160feSKefeng Wang 615c72160feSKefeng Wang memblock_reserve(start, size); 616c72160feSKefeng Wang /* Now convert initrd to virtual addresses */ 617c72160feSKefeng Wang initrd_start = (unsigned long)__va(phys_initrd_start); 618c72160feSKefeng Wang initrd_end = initrd_start + phys_initrd_size; 619c72160feSKefeng Wang initrd_below_start_ok = 1; 620c72160feSKefeng Wang 621c72160feSKefeng Wang return; 622c72160feSKefeng Wang disable: 623c72160feSKefeng Wang pr_cont(" - disabling initrd\n"); 624c72160feSKefeng Wang initrd_start = 0; 625c72160feSKefeng Wang initrd_end = 0; 626c72160feSKefeng Wang } 627c72160feSKefeng Wang 62855d5b7ddSArnd Bergmann void __weak __init free_initrd_mem(unsigned long start, unsigned long end) 6294afd58e1SChristoph Hellwig { 630899ee4afSMike Rapoport #ifdef CONFIG_ARCH_KEEP_MEMBLOCK 631899ee4afSMike Rapoport unsigned long aligned_start = ALIGN_DOWN(start, PAGE_SIZE); 632899ee4afSMike Rapoport unsigned long aligned_end = ALIGN(end, PAGE_SIZE); 633899ee4afSMike Rapoport 6344421cca0SMike Rapoport memblock_free((void *)aligned_start, aligned_end - aligned_start); 635899ee4afSMike Rapoport #endif 636899ee4afSMike Rapoport 637f94f7434SChristoph Hellwig free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM, 638f94f7434SChristoph Hellwig "initrd"); 6394afd58e1SChristoph Hellwig } 6404afd58e1SChristoph Hellwig 6412965faa5SDave Young #ifdef CONFIG_KEXEC_CORE 642e99332e7SLinus Torvalds static bool __init kexec_free_initrd(void) 64323091e28SChristoph Hellwig { 6449c15e852SHaren Myneni unsigned long crashk_start = (unsigned long)__va(crashk_res.start); 6459c15e852SHaren Myneni unsigned long crashk_end = (unsigned long)__va(crashk_res.end); 6469c15e852SHaren Myneni 6479c15e852SHaren Myneni /* 6489c15e852SHaren Myneni * If the initrd region is overlapped with crashkernel reserved region, 6499c15e852SHaren Myneni * free only memory that is not part of crashkernel region. 6509c15e852SHaren Myneni */ 65123091e28SChristoph Hellwig if (initrd_start >= crashk_end || initrd_end <= crashk_start) 65223091e28SChristoph Hellwig return false; 65323091e28SChristoph Hellwig 6549c15e852SHaren Myneni /* 65523091e28SChristoph Hellwig * Initialize initrd memory region since the kexec boot does not do. 6569c15e852SHaren Myneni */ 6579c15e852SHaren Myneni memset((void *)initrd_start, 0, initrd_end - initrd_start); 6589c15e852SHaren Myneni if (initrd_start < crashk_start) 6599c15e852SHaren Myneni free_initrd_mem(initrd_start, crashk_start); 6609c15e852SHaren Myneni if (initrd_end > crashk_end) 6619c15e852SHaren Myneni free_initrd_mem(crashk_end, initrd_end); 66223091e28SChristoph Hellwig return true; 6630f3d2bd5SJan Beulich } 66423091e28SChristoph Hellwig #else 66523091e28SChristoph Hellwig static inline bool kexec_free_initrd(void) 66623091e28SChristoph Hellwig { 66723091e28SChristoph Hellwig return false; 66823091e28SChristoph Hellwig } 66923091e28SChristoph Hellwig #endif /* CONFIG_KEXEC_CORE */ 6700f3d2bd5SJan Beulich 671a841c673SAndrew Morton #ifdef CONFIG_BLK_DEV_RAM 6724ada1e81SGeert Uytterhoeven static void __init populate_initrd_image(char *err) 6737c184ecdSChristoph Hellwig { 6747c184ecdSChristoph Hellwig ssize_t written; 675bf6419e4SChristoph Hellwig struct file *file; 676bf6419e4SChristoph Hellwig loff_t pos = 0; 6777c184ecdSChristoph Hellwig 6787c184ecdSChristoph Hellwig unpack_to_rootfs(__initramfs_start, __initramfs_size); 6797c184ecdSChristoph Hellwig 6807c184ecdSChristoph Hellwig printk(KERN_INFO "rootfs image is not initramfs (%s); looks like an initrd\n", 6817c184ecdSChristoph Hellwig err); 682bf6419e4SChristoph Hellwig file = filp_open("/initrd.image", O_WRONLY | O_CREAT, 0700); 683bf6419e4SChristoph Hellwig if (IS_ERR(file)) 6847c184ecdSChristoph Hellwig return; 6857c184ecdSChristoph Hellwig 686bf6419e4SChristoph Hellwig written = xwrite(file, (char *)initrd_start, initrd_end - initrd_start, 687bf6419e4SChristoph Hellwig &pos); 6887c184ecdSChristoph Hellwig if (written != initrd_end - initrd_start) 6897c184ecdSChristoph Hellwig pr_err("/initrd.image: incomplete write (%zd != %ld)\n", 6907c184ecdSChristoph Hellwig written, initrd_end - initrd_start); 691bf6419e4SChristoph Hellwig fput(file); 6927c184ecdSChristoph Hellwig } 6937c184ecdSChristoph Hellwig #endif /* CONFIG_BLK_DEV_RAM */ 6947c184ecdSChristoph Hellwig 695e7cb072eSRasmus Villemoes static void __init do_populate_rootfs(void *unused, async_cookie_t cookie) 6961da177e4SLinus Torvalds { 69717a9be31SStafford Horne /* Load the built in initramfs */ 698ffe8018cSHendrik Brueckner char *err = unpack_to_rootfs(__initramfs_start, __initramfs_size); 6991da177e4SLinus Torvalds if (err) 700dd23e809SFlorian Fainelli panic_show_mem("%s", err); /* Failed to decompress INTERNAL initramfs */ 701afef7889SChristoph Hellwig 702afef7889SChristoph Hellwig if (!initrd_start || IS_ENABLED(CONFIG_INITRAMFS_FORCE)) 703bb813f4cSTejun Heo goto done; 70454c7a891SChristoph Hellwig 705afef7889SChristoph Hellwig if (IS_ENABLED(CONFIG_BLK_DEV_RAM)) 706afef7889SChristoph Hellwig printk(KERN_INFO "Trying to unpack rootfs image as initramfs...\n"); 707afef7889SChristoph Hellwig else 708afef7889SChristoph Hellwig printk(KERN_INFO "Unpacking initramfs...\n"); 709afef7889SChristoph Hellwig 710afef7889SChristoph Hellwig err = unpack_to_rootfs((char *)initrd_start, initrd_end - initrd_start); 711afef7889SChristoph Hellwig if (err) { 7129ab6b718SChristoph Hellwig #ifdef CONFIG_BLK_DEV_RAM 7137c184ecdSChristoph Hellwig populate_initrd_image(err); 7149ab6b718SChristoph Hellwig #else 7159ab6b718SChristoph Hellwig printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err); 7169ab6b718SChristoph Hellwig #endif 71717a9be31SStafford Horne } 71823091e28SChristoph Hellwig 719afef7889SChristoph Hellwig done: 72023091e28SChristoph Hellwig /* 72123091e28SChristoph Hellwig * If the initrd region is overlapped with crashkernel reserved region, 72223091e28SChristoph Hellwig * free only memory that is not part of crashkernel region. 72323091e28SChristoph Hellwig */ 7245d59aa8fSSteven Price if (!do_retain_initrd && initrd_start && !kexec_free_initrd()) 72523091e28SChristoph Hellwig free_initrd_mem(initrd_start, initrd_end); 72623091e28SChristoph Hellwig initrd_start = 0; 72723091e28SChristoph Hellwig initrd_end = 0; 72823091e28SChristoph Hellwig 72908865514SLokesh Vutla flush_delayed_fput(); 730e7cb072eSRasmus Villemoes } 731e7cb072eSRasmus Villemoes 732e7cb072eSRasmus Villemoes static ASYNC_DOMAIN_EXCLUSIVE(initramfs_domain); 733e7cb072eSRasmus Villemoes static async_cookie_t initramfs_cookie; 734e7cb072eSRasmus Villemoes 735e7cb072eSRasmus Villemoes void wait_for_initramfs(void) 736e7cb072eSRasmus Villemoes { 737e7cb072eSRasmus Villemoes if (!initramfs_cookie) { 738e7cb072eSRasmus Villemoes /* 739e7cb072eSRasmus Villemoes * Something before rootfs_initcall wants to access 740e7cb072eSRasmus Villemoes * the filesystem/initramfs. Probably a bug. Make a 741e7cb072eSRasmus Villemoes * note, avoid deadlocking the machine, and let the 742e7cb072eSRasmus Villemoes * caller's access fail as it used to. 743e7cb072eSRasmus Villemoes */ 744e7cb072eSRasmus Villemoes pr_warn_once("wait_for_initramfs() called before rootfs_initcalls\n"); 745e7cb072eSRasmus Villemoes return; 746e7cb072eSRasmus Villemoes } 747e7cb072eSRasmus Villemoes async_synchronize_cookie_domain(initramfs_cookie + 1, &initramfs_domain); 748e7cb072eSRasmus Villemoes } 749e7cb072eSRasmus Villemoes EXPORT_SYMBOL_GPL(wait_for_initramfs); 750e7cb072eSRasmus Villemoes 751e7cb072eSRasmus Villemoes static int __init populate_rootfs(void) 752e7cb072eSRasmus Villemoes { 753e7cb072eSRasmus Villemoes initramfs_cookie = async_schedule_domain(do_populate_rootfs, NULL, 754e7cb072eSRasmus Villemoes &initramfs_domain); 755b234ed6dSRasmus Villemoes usermodehelper_enable(); 756e7cb072eSRasmus Villemoes if (!initramfs_async) 757e7cb072eSRasmus Villemoes wait_for_initramfs(); 7588d610dd5SLinus Torvalds return 0; 7591da177e4SLinus Torvalds } 7608d610dd5SLinus Torvalds rootfs_initcall(populate_rootfs); 761