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1#include <linux/init.h>
2#include <linux/fs.h>
3#include <linux/slab.h>
4#include <linux/types.h>
5#include <linux/fcntl.h>
6#include <linux/delay.h>
7#include <linux/string.h>
8#include <linux/dirent.h>
9#include <linux/syscalls.h>
10#include <linux/utime.h>
11
12static __initdata char *message;
13static void __init error(char *x)
14{
15 if (!message)
16 message = x;
17}
18
19/* link hash */
20
21#define N_ALIGN(len) ((((len) + 1) & ~3) + 2)
22
23static __initdata struct hash {
24 int ino, minor, major;
25 mode_t mode;
26 struct hash *next;
27 char name[N_ALIGN(PATH_MAX)];
28} *head[32];
29
30static inline int hash(int major, int minor, int ino)
31{
32 unsigned long tmp = ino + minor + (major << 3);
33 tmp += tmp >> 5;
34 return tmp & 31;
35}
36
37static char __init *find_link(int major, int minor, int ino,
38 mode_t mode, char *name)
39{
40 struct hash **p, *q;
41 for (p = head + hash(major, minor, ino); *p; p = &(*p)->next) {
42 if ((*p)->ino != ino)
43 continue;
44 if ((*p)->minor != minor)
45 continue;
46 if ((*p)->major != major)
47 continue;
48 if (((*p)->mode ^ mode) & S_IFMT)
49 continue;
50 return (*p)->name;
51 }
52 q = kmalloc(sizeof(struct hash), GFP_KERNEL);
53 if (!q)
54 panic("can't allocate link hash entry");
55 q->major = major;
56 q->minor = minor;
57 q->ino = ino;
58 q->mode = mode;
59 strcpy(q->name, name);
60 q->next = NULL;
61 *p = q;
62 return NULL;
63}
64
65static void __init free_hash(void)
66{
67 struct hash **p, *q;
68 for (p = head; p < head + 32; p++) {
69 while (*p) {
70 q = *p;
71 *p = q->next;
72 kfree(q);
73 }
74 }
75}
76
77static long __init do_utime(char __user *filename, time_t mtime)
78{
79 struct timespec t[2];
80
81 t[0].tv_sec = mtime;
82 t[0].tv_nsec = 0;
83 t[1].tv_sec = mtime;
84 t[1].tv_nsec = 0;
85
86 return do_utimes(AT_FDCWD, filename, t, AT_SYMLINK_NOFOLLOW);
87}
88
89static __initdata LIST_HEAD(dir_list);
90struct dir_entry {
91 struct list_head list;
92 char *name;
93 time_t mtime;
94};
95
96static void __init dir_add(const char *name, time_t mtime)
97{
98 struct dir_entry *de = kmalloc(sizeof(struct dir_entry), GFP_KERNEL);
99 if (!de)
100 panic("can't allocate dir_entry buffer");
101 INIT_LIST_HEAD(&de->list);
102 de->name = kstrdup(name, GFP_KERNEL);
103 de->mtime = mtime;
104 list_add(&de->list, &dir_list);
105}
106
107static void __init dir_utime(void)
108{
109 struct dir_entry *de, *tmp;
110 list_for_each_entry_safe(de, tmp, &dir_list, list) {
111 list_del(&de->list);
112 do_utime(de->name, de->mtime);
113 kfree(de->name);
114 kfree(de);
115 }
116}
117
118static __initdata time_t mtime;
119
120/* cpio header parsing */
121
122static __initdata unsigned long ino, major, minor, nlink;
123static __initdata mode_t mode;
124static __initdata unsigned long body_len, name_len;
125static __initdata uid_t uid;
126static __initdata gid_t gid;
127static __initdata unsigned rdev;
128
129static void __init parse_header(char *s)
130{
131 unsigned long parsed[12];
132 char buf[9];
133 int i;
134
135 buf[8] = '\0';
136 for (i = 0, s += 6; i < 12; i++, s += 8) {
137 memcpy(buf, s, 8);
138 parsed[i] = simple_strtoul(buf, NULL, 16);
139 }
140 ino = parsed[0];
141 mode = parsed[1];
142 uid = parsed[2];
143 gid = parsed[3];
144 nlink = parsed[4];
145 mtime = parsed[5];
146 body_len = parsed[6];
147 major = parsed[7];
148 minor = parsed[8];
149 rdev = new_encode_dev(MKDEV(parsed[9], parsed[10]));
150 name_len = parsed[11];
151}
152
153/* FSM */
154
155static __initdata enum state {
156 Start,
157 Collect,
158 GotHeader,
159 SkipIt,
160 GotName,
161 CopyFile,
162 GotSymlink,
163 Reset
164} state, next_state;
165
166static __initdata char *victim;
167static __initdata unsigned count;
168static __initdata loff_t this_header, next_header;
169
170static inline void __init eat(unsigned n)
171{
172 victim += n;
173 this_header += n;
174 count -= n;
175}
176
177static __initdata char *vcollected;
178static __initdata char *collected;
179static __initdata int remains;
180static __initdata char *collect;
181
182static void __init read_into(char *buf, unsigned size, enum state next)
183{
184 if (count >= size) {
185 collected = victim;
186 eat(size);
187 state = next;
188 } else {
189 collect = collected = buf;
190 remains = size;
191 next_state = next;
192 state = Collect;
193 }
194}
195
196static __initdata char *header_buf, *symlink_buf, *name_buf;
197
198static int __init do_start(void)
199{
200 read_into(header_buf, 110, GotHeader);
201 return 0;
202}
203
204static int __init do_collect(void)
205{
206 unsigned n = remains;
207 if (count < n)
208 n = count;
209 memcpy(collect, victim, n);
210 eat(n);
211 collect += n;
212 if ((remains -= n) != 0)
213 return 1;
214 state = next_state;
215 return 0;
216}
217
218static int __init do_header(void)
219{
220 if (memcmp(collected, "070707", 6)==0) {
221 error("incorrect cpio method used: use -H newc option");
222 return 1;
223 }
224 if (memcmp(collected, "070701", 6)) {
225 error("no cpio magic");
226 return 1;
227 }
228 parse_header(collected);
229 next_header = this_header + N_ALIGN(name_len) + body_len;
230 next_header = (next_header + 3) & ~3;
231 state = SkipIt;
232 if (name_len <= 0 || name_len > PATH_MAX)
233 return 0;
234 if (S_ISLNK(mode)) {
235 if (body_len > PATH_MAX)
236 return 0;
237 collect = collected = symlink_buf;
238 remains = N_ALIGN(name_len) + body_len;
239 next_state = GotSymlink;
240 state = Collect;
241 return 0;
242 }
243 if (S_ISREG(mode) || !body_len)
244 read_into(name_buf, N_ALIGN(name_len), GotName);
245 return 0;
246}
247
248static int __init do_skip(void)
249{
250 if (this_header + count < next_header) {
251 eat(count);
252 return 1;
253 } else {
254 eat(next_header - this_header);
255 state = next_state;
256 return 0;
257 }
258}
259
260static int __init do_reset(void)
261{
262 while(count && *victim == '\0')
263 eat(1);
264 if (count && (this_header & 3))
265 error("broken padding");
266 return 1;
267}
268
269static int __init maybe_link(void)
270{
271 if (nlink >= 2) {
272 char *old = find_link(major, minor, ino, mode, collected);
273 if (old)
274 return (sys_link(old, collected) < 0) ? -1 : 1;
275 }
276 return 0;
277}
278
279static void __init clean_path(char *path, mode_t mode)
280{
281 struct stat st;
282
283 if (!sys_newlstat(path, &st) && (st.st_mode^mode) & S_IFMT) {
284 if (S_ISDIR(st.st_mode))
285 sys_rmdir(path);
286 else
287 sys_unlink(path);
288 }
289}
290
291static __initdata int wfd;
292
293static int __init do_name(void)
294{
295 state = SkipIt;
296 next_state = Reset;
297 if (strcmp(collected, "TRAILER!!!") == 0) {
298 free_hash();
299 return 0;
300 }
301 clean_path(collected, mode);
302 if (S_ISREG(mode)) {
303 int ml = maybe_link();
304 if (ml >= 0) {
305 int openflags = O_WRONLY|O_CREAT;
306 if (ml != 1)
307 openflags |= O_TRUNC;
308 wfd = sys_open(collected, openflags, mode);
309
310 if (wfd >= 0) {
311 sys_fchown(wfd, uid, gid);
312 sys_fchmod(wfd, mode);
313 if (body_len)
314 sys_ftruncate(wfd, body_len);
315 vcollected = kstrdup(collected, GFP_KERNEL);
316 state = CopyFile;
317 }
318 }
319 } else if (S_ISDIR(mode)) {
320 sys_mkdir(collected, mode);
321 sys_chown(collected, uid, gid);
322 sys_chmod(collected, mode);
323 dir_add(collected, mtime);
324 } else if (S_ISBLK(mode) || S_ISCHR(mode) ||
325 S_ISFIFO(mode) || S_ISSOCK(mode)) {
326 if (maybe_link() == 0) {
327 sys_mknod(collected, mode, rdev);
328 sys_chown(collected, uid, gid);
329 sys_chmod(collected, mode);
330 do_utime(collected, mtime);
331 }
332 }
333 return 0;
334}
335
336static int __init do_copy(void)
337{
338 if (count >= body_len) {
339 sys_write(wfd, victim, body_len);
340 sys_close(wfd);
341 do_utime(vcollected, mtime);
342 kfree(vcollected);
343 eat(body_len);
344 state = SkipIt;
345 return 0;
346 } else {
347 sys_write(wfd, victim, count);
348 body_len -= count;
349 eat(count);
350 return 1;
351 }
352}
353
354static int __init do_symlink(void)
355{
356 collected[N_ALIGN(name_len) + body_len] = '\0';
357 clean_path(collected, 0);
358 sys_symlink(collected + N_ALIGN(name_len), collected);
359 sys_lchown(collected, uid, gid);
360 do_utime(collected, mtime);
361 state = SkipIt;
362 next_state = Reset;
363 return 0;
364}
365
366static __initdata int (*actions[])(void) = {
367 [Start] = do_start,
368 [Collect] = do_collect,
369 [GotHeader] = do_header,
370 [SkipIt] = do_skip,
371 [GotName] = do_name,
372 [CopyFile] = do_copy,
373 [GotSymlink] = do_symlink,
374 [Reset] = do_reset,
375};
376
377static int __init write_buffer(char *buf, unsigned len)
378{
379 count = len;
380 victim = buf;
381
382 while (!actions[state]())
383 ;
384 return len - count;
385}
386
387static int __init flush_buffer(void *bufv, unsigned len)
388{
389 char *buf = (char *) bufv;
390 int written;
391 int origLen = len;
392 if (message)
393 return -1;
394 while ((written = write_buffer(buf, len)) < len && !message) {
395 char c = buf[written];
396 if (c == '0') {
397 buf += written;
398 len -= written;
399 state = Start;
400 } else if (c == 0) {
401 buf += written;
402 len -= written;
403 state = Reset;
404 } else
405 error("junk in compressed archive");
406 }
407 return origLen;
408}
409
410static unsigned my_inptr; /* index of next byte to be processed in inbuf */
411
412#include <linux/decompress/generic.h>
413
414static char * __init unpack_to_rootfs(char *buf, unsigned len)
415{
416 int written, res;
417 decompress_fn decompress;
418 const char *compress_name;
419 static __initdata char msg_buf[64];
420
421 header_buf = kmalloc(110, GFP_KERNEL);
422 symlink_buf = kmalloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1, GFP_KERNEL);
423 name_buf = kmalloc(N_ALIGN(PATH_MAX), GFP_KERNEL);
424
425 if (!header_buf || !symlink_buf || !name_buf)
426 panic("can't allocate buffers");
427
428 state = Start;
429 this_header = 0;
430 message = NULL;
431 while (!message && len) {
432 loff_t saved_offset = this_header;
433 if (*buf == '0' && !(this_header & 3)) {
434 state = Start;
435 written = write_buffer(buf, len);
436 buf += written;
437 len -= written;
438 continue;
439 }
440 if (!*buf) {
441 buf++;
442 len--;
443 this_header++;
444 continue;
445 }
446 this_header = 0;
447 decompress = decompress_method(buf, len, &compress_name);
448 if (decompress) {
449 res = decompress(buf, len, NULL, flush_buffer, NULL,
450 &my_inptr, error);
451 if (res)
452 error("decompressor failed");
453 } else if (compress_name) {
454 if (!message) {
455 snprintf(msg_buf, sizeof msg_buf,
456 "compression method %s not configured",
457 compress_name);
458 message = msg_buf;
459 }
460 } else
461 error("junk in compressed archive");
462 if (state != Reset)
463 error("junk in compressed archive");
464 this_header = saved_offset + my_inptr;
465 buf += my_inptr;
466 len -= my_inptr;
467 }
468 dir_utime();
469 kfree(name_buf);
470 kfree(symlink_buf);
471 kfree(header_buf);
472 return message;
473}
474
475static int __initdata do_retain_initrd;
476
477static int __init retain_initrd_param(char *str)
478{
479 if (*str)
480 return 0;
481 do_retain_initrd = 1;
482 return 1;
483}
484__setup("retain_initrd", retain_initrd_param);
485
486extern char __initramfs_start[];
487extern unsigned long __initramfs_size;
488#include <linux/initrd.h>
489#include <linux/kexec.h>
490
491static void __init free_initrd(void)
492{
493#ifdef CONFIG_KEXEC
494 unsigned long crashk_start = (unsigned long)__va(crashk_res.start);
495 unsigned long crashk_end = (unsigned long)__va(crashk_res.end);
496#endif
497 if (do_retain_initrd)
498 goto skip;
499
500#ifdef CONFIG_KEXEC
501 /*
502 * If the initrd region is overlapped with crashkernel reserved region,
503 * free only memory that is not part of crashkernel region.
504 */
505 if (initrd_start < crashk_end && initrd_end > crashk_start) {
506 /*
507 * Initialize initrd memory region since the kexec boot does
508 * not do.
509 */
510 memset((void *)initrd_start, 0, initrd_end - initrd_start);
511 if (initrd_start < crashk_start)
512 free_initrd_mem(initrd_start, crashk_start);
513 if (initrd_end > crashk_end)
514 free_initrd_mem(crashk_end, initrd_end);
515 } else
516#endif
517 free_initrd_mem(initrd_start, initrd_end);
518skip:
519 initrd_start = 0;
520 initrd_end = 0;
521}
522
523#ifdef CONFIG_BLK_DEV_RAM
524#define BUF_SIZE 1024
525static void __init clean_rootfs(void)
526{
527 int fd;
528 void *buf;
529 struct linux_dirent64 *dirp;
530 int num;
531
532 fd = sys_open((const char __user __force *) "/", O_RDONLY, 0);
533 WARN_ON(fd < 0);
534 if (fd < 0)
535 return;
536 buf = kzalloc(BUF_SIZE, GFP_KERNEL);
537 WARN_ON(!buf);
538 if (!buf) {
539 sys_close(fd);
540 return;
541 }
542
543 dirp = buf;
544 num = sys_getdents64(fd, dirp, BUF_SIZE);
545 while (num > 0) {
546 while (num > 0) {
547 struct stat st;
548 int ret;
549
550 ret = sys_newlstat(dirp->d_name, &st);
551 WARN_ON_ONCE(ret);
552 if (!ret) {
553 if (S_ISDIR(st.st_mode))
554 sys_rmdir(dirp->d_name);
555 else
556 sys_unlink(dirp->d_name);
557 }
558
559 num -= dirp->d_reclen;
560 dirp = (void *)dirp + dirp->d_reclen;
561 }
562 dirp = buf;
563 memset(buf, 0, BUF_SIZE);
564 num = sys_getdents64(fd, dirp, BUF_SIZE);
565 }
566
567 sys_close(fd);
568 kfree(buf);
569}
570#endif
571
572static int __init populate_rootfs(void)
573{
574 char *err = unpack_to_rootfs(__initramfs_start, __initramfs_size);
575 if (err)
576 panic(err); /* Failed to decompress INTERNAL initramfs */
577 if (initrd_start) {
578#ifdef CONFIG_BLK_DEV_RAM
579 int fd;
580 printk(KERN_INFO "Trying to unpack rootfs image as initramfs...\n");
581 err = unpack_to_rootfs((char *)initrd_start,
582 initrd_end - initrd_start);
583 if (!err) {
584 free_initrd();
585 return 0;
586 } else {
587 clean_rootfs();
588 unpack_to_rootfs(__initramfs_start, __initramfs_size);
589 }
590 printk(KERN_INFO "rootfs image is not initramfs (%s)"
591 "; looks like an initrd\n", err);
592 fd = sys_open((const char __user __force *) "/initrd.image",
593 O_WRONLY|O_CREAT, 0700);
594 if (fd >= 0) {
595 sys_write(fd, (char *)initrd_start,
596 initrd_end - initrd_start);
597 sys_close(fd);
598 free_initrd();
599 }
600#else
601 printk(KERN_INFO "Unpacking initramfs...\n");
602 err = unpack_to_rootfs((char *)initrd_start,
603 initrd_end - initrd_start);
604 if (err)
605 printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err);
606 free_initrd();
607#endif
608 }
609 return 0;
610}
611rootfs_initcall(populate_rootfs);
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/init.h>
3#include <linux/async.h>
4#include <linux/fs.h>
5#include <linux/slab.h>
6#include <linux/types.h>
7#include <linux/fcntl.h>
8#include <linux/delay.h>
9#include <linux/string.h>
10#include <linux/dirent.h>
11#include <linux/syscalls.h>
12#include <linux/utime.h>
13#include <linux/file.h>
14#include <linux/memblock.h>
15#include <linux/mm.h>
16#include <linux/namei.h>
17#include <linux/init_syscalls.h>
18#include <linux/task_work.h>
19#include <linux/umh.h>
20
21static __initdata bool csum_present;
22static __initdata u32 io_csum;
23
24static ssize_t __init xwrite(struct file *file, const unsigned char *p,
25 size_t count, loff_t *pos)
26{
27 ssize_t out = 0;
28
29 /* sys_write only can write MAX_RW_COUNT aka 2G-4K bytes at most */
30 while (count) {
31 ssize_t rv = kernel_write(file, p, count, pos);
32
33 if (rv < 0) {
34 if (rv == -EINTR || rv == -EAGAIN)
35 continue;
36 return out ? out : rv;
37 } else if (rv == 0)
38 break;
39
40 if (csum_present) {
41 ssize_t i;
42
43 for (i = 0; i < rv; i++)
44 io_csum += p[i];
45 }
46
47 p += rv;
48 out += rv;
49 count -= rv;
50 }
51
52 return out;
53}
54
55static __initdata char *message;
56static void __init error(char *x)
57{
58 if (!message)
59 message = x;
60}
61
62static void panic_show_mem(const char *fmt, ...)
63{
64 va_list args;
65
66 show_mem(0, NULL);
67 va_start(args, fmt);
68 panic(fmt, args);
69 va_end(args);
70}
71
72/* link hash */
73
74#define N_ALIGN(len) ((((len) + 1) & ~3) + 2)
75
76static __initdata struct hash {
77 int ino, minor, major;
78 umode_t mode;
79 struct hash *next;
80 char name[N_ALIGN(PATH_MAX)];
81} *head[32];
82
83static inline int hash(int major, int minor, int ino)
84{
85 unsigned long tmp = ino + minor + (major << 3);
86 tmp += tmp >> 5;
87 return tmp & 31;
88}
89
90static char __init *find_link(int major, int minor, int ino,
91 umode_t mode, char *name)
92{
93 struct hash **p, *q;
94 for (p = head + hash(major, minor, ino); *p; p = &(*p)->next) {
95 if ((*p)->ino != ino)
96 continue;
97 if ((*p)->minor != minor)
98 continue;
99 if ((*p)->major != major)
100 continue;
101 if (((*p)->mode ^ mode) & S_IFMT)
102 continue;
103 return (*p)->name;
104 }
105 q = kmalloc(sizeof(struct hash), GFP_KERNEL);
106 if (!q)
107 panic_show_mem("can't allocate link hash entry");
108 q->major = major;
109 q->minor = minor;
110 q->ino = ino;
111 q->mode = mode;
112 strcpy(q->name, name);
113 q->next = NULL;
114 *p = q;
115 return NULL;
116}
117
118static void __init free_hash(void)
119{
120 struct hash **p, *q;
121 for (p = head; p < head + 32; p++) {
122 while (*p) {
123 q = *p;
124 *p = q->next;
125 kfree(q);
126 }
127 }
128}
129
130#ifdef CONFIG_INITRAMFS_PRESERVE_MTIME
131static void __init do_utime(char *filename, time64_t mtime)
132{
133 struct timespec64 t[2] = { { .tv_sec = mtime }, { .tv_sec = mtime } };
134 init_utimes(filename, t);
135}
136
137static void __init do_utime_path(const struct path *path, time64_t mtime)
138{
139 struct timespec64 t[2] = { { .tv_sec = mtime }, { .tv_sec = mtime } };
140 vfs_utimes(path, t);
141}
142
143static __initdata LIST_HEAD(dir_list);
144struct dir_entry {
145 struct list_head list;
146 time64_t mtime;
147 char name[];
148};
149
150static void __init dir_add(const char *name, time64_t mtime)
151{
152 size_t nlen = strlen(name) + 1;
153 struct dir_entry *de;
154
155 de = kmalloc(sizeof(struct dir_entry) + nlen, GFP_KERNEL);
156 if (!de)
157 panic_show_mem("can't allocate dir_entry buffer");
158 INIT_LIST_HEAD(&de->list);
159 strscpy(de->name, name, nlen);
160 de->mtime = mtime;
161 list_add(&de->list, &dir_list);
162}
163
164static void __init dir_utime(void)
165{
166 struct dir_entry *de, *tmp;
167 list_for_each_entry_safe(de, tmp, &dir_list, list) {
168 list_del(&de->list);
169 do_utime(de->name, de->mtime);
170 kfree(de);
171 }
172}
173#else
174static void __init do_utime(char *filename, time64_t mtime) {}
175static void __init do_utime_path(const struct path *path, time64_t mtime) {}
176static void __init dir_add(const char *name, time64_t mtime) {}
177static void __init dir_utime(void) {}
178#endif
179
180static __initdata time64_t mtime;
181
182/* cpio header parsing */
183
184static __initdata unsigned long ino, major, minor, nlink;
185static __initdata umode_t mode;
186static __initdata unsigned long body_len, name_len;
187static __initdata uid_t uid;
188static __initdata gid_t gid;
189static __initdata unsigned rdev;
190static __initdata u32 hdr_csum;
191
192static void __init parse_header(char *s)
193{
194 unsigned long parsed[13];
195 char buf[9];
196 int i;
197
198 buf[8] = '\0';
199 for (i = 0, s += 6; i < 13; i++, s += 8) {
200 memcpy(buf, s, 8);
201 parsed[i] = simple_strtoul(buf, NULL, 16);
202 }
203 ino = parsed[0];
204 mode = parsed[1];
205 uid = parsed[2];
206 gid = parsed[3];
207 nlink = parsed[4];
208 mtime = parsed[5]; /* breaks in y2106 */
209 body_len = parsed[6];
210 major = parsed[7];
211 minor = parsed[8];
212 rdev = new_encode_dev(MKDEV(parsed[9], parsed[10]));
213 name_len = parsed[11];
214 hdr_csum = parsed[12];
215}
216
217/* FSM */
218
219static __initdata enum state {
220 Start,
221 Collect,
222 GotHeader,
223 SkipIt,
224 GotName,
225 CopyFile,
226 GotSymlink,
227 Reset
228} state, next_state;
229
230static __initdata char *victim;
231static unsigned long byte_count __initdata;
232static __initdata loff_t this_header, next_header;
233
234static inline void __init eat(unsigned n)
235{
236 victim += n;
237 this_header += n;
238 byte_count -= n;
239}
240
241static __initdata char *collected;
242static long remains __initdata;
243static __initdata char *collect;
244
245static void __init read_into(char *buf, unsigned size, enum state next)
246{
247 if (byte_count >= size) {
248 collected = victim;
249 eat(size);
250 state = next;
251 } else {
252 collect = collected = buf;
253 remains = size;
254 next_state = next;
255 state = Collect;
256 }
257}
258
259static __initdata char *header_buf, *symlink_buf, *name_buf;
260
261static int __init do_start(void)
262{
263 read_into(header_buf, 110, GotHeader);
264 return 0;
265}
266
267static int __init do_collect(void)
268{
269 unsigned long n = remains;
270 if (byte_count < n)
271 n = byte_count;
272 memcpy(collect, victim, n);
273 eat(n);
274 collect += n;
275 if ((remains -= n) != 0)
276 return 1;
277 state = next_state;
278 return 0;
279}
280
281static int __init do_header(void)
282{
283 if (!memcmp(collected, "070701", 6)) {
284 csum_present = false;
285 } else if (!memcmp(collected, "070702", 6)) {
286 csum_present = true;
287 } else {
288 if (memcmp(collected, "070707", 6) == 0)
289 error("incorrect cpio method used: use -H newc option");
290 else
291 error("no cpio magic");
292 return 1;
293 }
294 parse_header(collected);
295 next_header = this_header + N_ALIGN(name_len) + body_len;
296 next_header = (next_header + 3) & ~3;
297 state = SkipIt;
298 if (name_len <= 0 || name_len > PATH_MAX)
299 return 0;
300 if (S_ISLNK(mode)) {
301 if (body_len > PATH_MAX)
302 return 0;
303 collect = collected = symlink_buf;
304 remains = N_ALIGN(name_len) + body_len;
305 next_state = GotSymlink;
306 state = Collect;
307 return 0;
308 }
309 if (S_ISREG(mode) || !body_len)
310 read_into(name_buf, N_ALIGN(name_len), GotName);
311 return 0;
312}
313
314static int __init do_skip(void)
315{
316 if (this_header + byte_count < next_header) {
317 eat(byte_count);
318 return 1;
319 } else {
320 eat(next_header - this_header);
321 state = next_state;
322 return 0;
323 }
324}
325
326static int __init do_reset(void)
327{
328 while (byte_count && *victim == '\0')
329 eat(1);
330 if (byte_count && (this_header & 3))
331 error("broken padding");
332 return 1;
333}
334
335static void __init clean_path(char *path, umode_t fmode)
336{
337 struct kstat st;
338
339 if (!init_stat(path, &st, AT_SYMLINK_NOFOLLOW) &&
340 (st.mode ^ fmode) & S_IFMT) {
341 if (S_ISDIR(st.mode))
342 init_rmdir(path);
343 else
344 init_unlink(path);
345 }
346}
347
348static int __init maybe_link(void)
349{
350 if (nlink >= 2) {
351 char *old = find_link(major, minor, ino, mode, collected);
352 if (old) {
353 clean_path(collected, 0);
354 return (init_link(old, collected) < 0) ? -1 : 1;
355 }
356 }
357 return 0;
358}
359
360static __initdata struct file *wfile;
361static __initdata loff_t wfile_pos;
362
363static int __init do_name(void)
364{
365 state = SkipIt;
366 next_state = Reset;
367 if (strcmp(collected, "TRAILER!!!") == 0) {
368 free_hash();
369 return 0;
370 }
371 clean_path(collected, mode);
372 if (S_ISREG(mode)) {
373 int ml = maybe_link();
374 if (ml >= 0) {
375 int openflags = O_WRONLY|O_CREAT;
376 if (ml != 1)
377 openflags |= O_TRUNC;
378 wfile = filp_open(collected, openflags, mode);
379 if (IS_ERR(wfile))
380 return 0;
381 wfile_pos = 0;
382 io_csum = 0;
383
384 vfs_fchown(wfile, uid, gid);
385 vfs_fchmod(wfile, mode);
386 if (body_len)
387 vfs_truncate(&wfile->f_path, body_len);
388 state = CopyFile;
389 }
390 } else if (S_ISDIR(mode)) {
391 init_mkdir(collected, mode);
392 init_chown(collected, uid, gid, 0);
393 init_chmod(collected, mode);
394 dir_add(collected, mtime);
395 } else if (S_ISBLK(mode) || S_ISCHR(mode) ||
396 S_ISFIFO(mode) || S_ISSOCK(mode)) {
397 if (maybe_link() == 0) {
398 init_mknod(collected, mode, rdev);
399 init_chown(collected, uid, gid, 0);
400 init_chmod(collected, mode);
401 do_utime(collected, mtime);
402 }
403 }
404 return 0;
405}
406
407static int __init do_copy(void)
408{
409 if (byte_count >= body_len) {
410 if (xwrite(wfile, victim, body_len, &wfile_pos) != body_len)
411 error("write error");
412
413 do_utime_path(&wfile->f_path, mtime);
414 fput(wfile);
415 if (csum_present && io_csum != hdr_csum)
416 error("bad data checksum");
417 eat(body_len);
418 state = SkipIt;
419 return 0;
420 } else {
421 if (xwrite(wfile, victim, byte_count, &wfile_pos) != byte_count)
422 error("write error");
423 body_len -= byte_count;
424 eat(byte_count);
425 return 1;
426 }
427}
428
429static int __init do_symlink(void)
430{
431 collected[N_ALIGN(name_len) + body_len] = '\0';
432 clean_path(collected, 0);
433 init_symlink(collected + N_ALIGN(name_len), collected);
434 init_chown(collected, uid, gid, AT_SYMLINK_NOFOLLOW);
435 do_utime(collected, mtime);
436 state = SkipIt;
437 next_state = Reset;
438 return 0;
439}
440
441static __initdata int (*actions[])(void) = {
442 [Start] = do_start,
443 [Collect] = do_collect,
444 [GotHeader] = do_header,
445 [SkipIt] = do_skip,
446 [GotName] = do_name,
447 [CopyFile] = do_copy,
448 [GotSymlink] = do_symlink,
449 [Reset] = do_reset,
450};
451
452static long __init write_buffer(char *buf, unsigned long len)
453{
454 byte_count = len;
455 victim = buf;
456
457 while (!actions[state]())
458 ;
459 return len - byte_count;
460}
461
462static long __init flush_buffer(void *bufv, unsigned long len)
463{
464 char *buf = bufv;
465 long written;
466 long origLen = len;
467 if (message)
468 return -1;
469 while ((written = write_buffer(buf, len)) < len && !message) {
470 char c = buf[written];
471 if (c == '0') {
472 buf += written;
473 len -= written;
474 state = Start;
475 } else if (c == 0) {
476 buf += written;
477 len -= written;
478 state = Reset;
479 } else
480 error("junk within compressed archive");
481 }
482 return origLen;
483}
484
485static unsigned long my_inptr __initdata; /* index of next byte to be processed in inbuf */
486
487#include <linux/decompress/generic.h>
488
489static char * __init unpack_to_rootfs(char *buf, unsigned long len)
490{
491 long written;
492 decompress_fn decompress;
493 const char *compress_name;
494 static __initdata char msg_buf[64];
495
496 header_buf = kmalloc(110, GFP_KERNEL);
497 symlink_buf = kmalloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1, GFP_KERNEL);
498 name_buf = kmalloc(N_ALIGN(PATH_MAX), GFP_KERNEL);
499
500 if (!header_buf || !symlink_buf || !name_buf)
501 panic_show_mem("can't allocate buffers");
502
503 state = Start;
504 this_header = 0;
505 message = NULL;
506 while (!message && len) {
507 loff_t saved_offset = this_header;
508 if (*buf == '0' && !(this_header & 3)) {
509 state = Start;
510 written = write_buffer(buf, len);
511 buf += written;
512 len -= written;
513 continue;
514 }
515 if (!*buf) {
516 buf++;
517 len--;
518 this_header++;
519 continue;
520 }
521 this_header = 0;
522 decompress = decompress_method(buf, len, &compress_name);
523 pr_debug("Detected %s compressed data\n", compress_name);
524 if (decompress) {
525 int res = decompress(buf, len, NULL, flush_buffer, NULL,
526 &my_inptr, error);
527 if (res)
528 error("decompressor failed");
529 } else if (compress_name) {
530 if (!message) {
531 snprintf(msg_buf, sizeof msg_buf,
532 "compression method %s not configured",
533 compress_name);
534 message = msg_buf;
535 }
536 } else
537 error("invalid magic at start of compressed archive");
538 if (state != Reset)
539 error("junk at the end of compressed archive");
540 this_header = saved_offset + my_inptr;
541 buf += my_inptr;
542 len -= my_inptr;
543 }
544 dir_utime();
545 kfree(name_buf);
546 kfree(symlink_buf);
547 kfree(header_buf);
548 return message;
549}
550
551static int __initdata do_retain_initrd;
552
553static int __init retain_initrd_param(char *str)
554{
555 if (*str)
556 return 0;
557 do_retain_initrd = 1;
558 return 1;
559}
560__setup("retain_initrd", retain_initrd_param);
561
562#ifdef CONFIG_ARCH_HAS_KEEPINITRD
563static int __init keepinitrd_setup(char *__unused)
564{
565 do_retain_initrd = 1;
566 return 1;
567}
568__setup("keepinitrd", keepinitrd_setup);
569#endif
570
571static bool __initdata initramfs_async = true;
572static int __init initramfs_async_setup(char *str)
573{
574 strtobool(str, &initramfs_async);
575 return 1;
576}
577__setup("initramfs_async=", initramfs_async_setup);
578
579extern char __initramfs_start[];
580extern unsigned long __initramfs_size;
581#include <linux/initrd.h>
582#include <linux/kexec.h>
583
584void __init reserve_initrd_mem(void)
585{
586 phys_addr_t start;
587 unsigned long size;
588
589 /* Ignore the virtul address computed during device tree parsing */
590 initrd_start = initrd_end = 0;
591
592 if (!phys_initrd_size)
593 return;
594 /*
595 * Round the memory region to page boundaries as per free_initrd_mem()
596 * This allows us to detect whether the pages overlapping the initrd
597 * are in use, but more importantly, reserves the entire set of pages
598 * as we don't want these pages allocated for other purposes.
599 */
600 start = round_down(phys_initrd_start, PAGE_SIZE);
601 size = phys_initrd_size + (phys_initrd_start - start);
602 size = round_up(size, PAGE_SIZE);
603
604 if (!memblock_is_region_memory(start, size)) {
605 pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region",
606 (u64)start, size);
607 goto disable;
608 }
609
610 if (memblock_is_region_reserved(start, size)) {
611 pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region\n",
612 (u64)start, size);
613 goto disable;
614 }
615
616 memblock_reserve(start, size);
617 /* Now convert initrd to virtual addresses */
618 initrd_start = (unsigned long)__va(phys_initrd_start);
619 initrd_end = initrd_start + phys_initrd_size;
620 initrd_below_start_ok = 1;
621
622 return;
623disable:
624 pr_cont(" - disabling initrd\n");
625 initrd_start = 0;
626 initrd_end = 0;
627}
628
629void __weak __init free_initrd_mem(unsigned long start, unsigned long end)
630{
631#ifdef CONFIG_ARCH_KEEP_MEMBLOCK
632 unsigned long aligned_start = ALIGN_DOWN(start, PAGE_SIZE);
633 unsigned long aligned_end = ALIGN(end, PAGE_SIZE);
634
635 memblock_free((void *)aligned_start, aligned_end - aligned_start);
636#endif
637
638 free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
639 "initrd");
640}
641
642#ifdef CONFIG_KEXEC_CORE
643static bool __init kexec_free_initrd(void)
644{
645 unsigned long crashk_start = (unsigned long)__va(crashk_res.start);
646 unsigned long crashk_end = (unsigned long)__va(crashk_res.end);
647
648 /*
649 * If the initrd region is overlapped with crashkernel reserved region,
650 * free only memory that is not part of crashkernel region.
651 */
652 if (initrd_start >= crashk_end || initrd_end <= crashk_start)
653 return false;
654
655 /*
656 * Initialize initrd memory region since the kexec boot does not do.
657 */
658 memset((void *)initrd_start, 0, initrd_end - initrd_start);
659 if (initrd_start < crashk_start)
660 free_initrd_mem(initrd_start, crashk_start);
661 if (initrd_end > crashk_end)
662 free_initrd_mem(crashk_end, initrd_end);
663 return true;
664}
665#else
666static inline bool kexec_free_initrd(void)
667{
668 return false;
669}
670#endif /* CONFIG_KEXEC_CORE */
671
672#ifdef CONFIG_BLK_DEV_RAM
673static void __init populate_initrd_image(char *err)
674{
675 ssize_t written;
676 struct file *file;
677 loff_t pos = 0;
678
679 unpack_to_rootfs(__initramfs_start, __initramfs_size);
680
681 printk(KERN_INFO "rootfs image is not initramfs (%s); looks like an initrd\n",
682 err);
683 file = filp_open("/initrd.image", O_WRONLY | O_CREAT, 0700);
684 if (IS_ERR(file))
685 return;
686
687 written = xwrite(file, (char *)initrd_start, initrd_end - initrd_start,
688 &pos);
689 if (written != initrd_end - initrd_start)
690 pr_err("/initrd.image: incomplete write (%zd != %ld)\n",
691 written, initrd_end - initrd_start);
692 fput(file);
693}
694#endif /* CONFIG_BLK_DEV_RAM */
695
696static void __init do_populate_rootfs(void *unused, async_cookie_t cookie)
697{
698 /* Load the built in initramfs */
699 char *err = unpack_to_rootfs(__initramfs_start, __initramfs_size);
700 if (err)
701 panic_show_mem("%s", err); /* Failed to decompress INTERNAL initramfs */
702
703 if (!initrd_start || IS_ENABLED(CONFIG_INITRAMFS_FORCE))
704 goto done;
705
706 if (IS_ENABLED(CONFIG_BLK_DEV_RAM))
707 printk(KERN_INFO "Trying to unpack rootfs image as initramfs...\n");
708 else
709 printk(KERN_INFO "Unpacking initramfs...\n");
710
711 err = unpack_to_rootfs((char *)initrd_start, initrd_end - initrd_start);
712 if (err) {
713#ifdef CONFIG_BLK_DEV_RAM
714 populate_initrd_image(err);
715#else
716 printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err);
717#endif
718 }
719
720done:
721 /*
722 * If the initrd region is overlapped with crashkernel reserved region,
723 * free only memory that is not part of crashkernel region.
724 */
725 if (!do_retain_initrd && initrd_start && !kexec_free_initrd())
726 free_initrd_mem(initrd_start, initrd_end);
727 initrd_start = 0;
728 initrd_end = 0;
729
730 flush_delayed_fput();
731 task_work_run();
732}
733
734static ASYNC_DOMAIN_EXCLUSIVE(initramfs_domain);
735static async_cookie_t initramfs_cookie;
736
737void wait_for_initramfs(void)
738{
739 if (!initramfs_cookie) {
740 /*
741 * Something before rootfs_initcall wants to access
742 * the filesystem/initramfs. Probably a bug. Make a
743 * note, avoid deadlocking the machine, and let the
744 * caller's access fail as it used to.
745 */
746 pr_warn_once("wait_for_initramfs() called before rootfs_initcalls\n");
747 return;
748 }
749 async_synchronize_cookie_domain(initramfs_cookie + 1, &initramfs_domain);
750}
751EXPORT_SYMBOL_GPL(wait_for_initramfs);
752
753static int __init populate_rootfs(void)
754{
755 initramfs_cookie = async_schedule_domain(do_populate_rootfs, NULL,
756 &initramfs_domain);
757 usermodehelper_enable();
758 if (!initramfs_async)
759 wait_for_initramfs();
760 return 0;
761}
762rootfs_initcall(populate_rootfs);