1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/init.h>
3 #include <linux/async.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>
16 #include <linux/namei.h>
17 #include <linux/init_syscalls.h>
18 #include <linux/task_work.h>
19 #include <linux/umh.h>
21 static __initdata
bool csum_present
;
22 static __initdata u32 io_csum
;
24 static ssize_t __init
xwrite(struct file
*file
, const unsigned char *p
,
25 size_t count
, loff_t
*pos
)
29 /* sys_write only can write MAX_RW_COUNT aka 2G-4K bytes at most */
31 ssize_t rv
= kernel_write(file
, p
, count
, pos
);
34 if (rv
== -EINTR
|| rv
== -EAGAIN
)
36 return out
? out
: rv
;
43 for (i
= 0; i
< rv
; i
++)
55 static __initdata
char *message
;
56 static void __init
error(char *x
)
62 static void panic_show_mem(const char *fmt
, ...)
74 #define N_ALIGN(len) ((((len) + 1) & ~3) + 2)
76 static __initdata
struct hash
{
77 int ino
, minor
, major
;
80 char name
[N_ALIGN(PATH_MAX
)];
83 static inline int hash(int major
, int minor
, int ino
)
85 unsigned long tmp
= ino
+ minor
+ (major
<< 3);
90 static char __init
*find_link(int major
, int minor
, int ino
,
91 umode_t mode
, char *name
)
94 for (p
= head
+ hash(major
, minor
, ino
); *p
; p
= &(*p
)->next
) {
97 if ((*p
)->minor
!= minor
)
99 if ((*p
)->major
!= major
)
101 if (((*p
)->mode
^ mode
) & S_IFMT
)
105 q
= kmalloc(sizeof(struct hash
), GFP_KERNEL
);
107 panic_show_mem("can't allocate link hash entry");
112 strcpy(q
->name
, name
);
118 static void __init
free_hash(void)
121 for (p
= head
; p
< head
+ 32; p
++) {
130 #ifdef CONFIG_INITRAMFS_PRESERVE_MTIME
131 static void __init
do_utime(char *filename
, time64_t mtime
)
133 struct timespec64 t
[2] = { { .tv_sec
= mtime
}, { .tv_sec
= mtime
} };
134 init_utimes(filename
, t
);
137 static void __init
do_utime_path(const struct path
*path
, time64_t mtime
)
139 struct timespec64 t
[2] = { { .tv_sec
= mtime
}, { .tv_sec
= mtime
} };
143 static __initdata
LIST_HEAD(dir_list
);
145 struct list_head list
;
150 static void __init
dir_add(const char *name
, time64_t mtime
)
152 size_t nlen
= strlen(name
) + 1;
153 struct dir_entry
*de
;
155 de
= kmalloc(sizeof(struct dir_entry
) + nlen
, GFP_KERNEL
);
157 panic_show_mem("can't allocate dir_entry buffer");
158 INIT_LIST_HEAD(&de
->list
);
159 strscpy(de
->name
, name
, nlen
);
161 list_add(&de
->list
, &dir_list
);
164 static void __init
dir_utime(void)
166 struct dir_entry
*de
, *tmp
;
167 list_for_each_entry_safe(de
, tmp
, &dir_list
, list
) {
169 do_utime(de
->name
, de
->mtime
);
174 static void __init
do_utime(char *filename
, time64_t mtime
) {}
175 static void __init
do_utime_path(const struct path
*path
, time64_t mtime
) {}
176 static void __init
dir_add(const char *name
, time64_t mtime
) {}
177 static void __init
dir_utime(void) {}
180 static __initdata time64_t mtime
;
182 /* cpio header parsing */
184 static __initdata
unsigned long ino
, major
, minor
, nlink
;
185 static __initdata umode_t mode
;
186 static __initdata
unsigned long body_len
, name_len
;
187 static __initdata uid_t uid
;
188 static __initdata gid_t gid
;
189 static __initdata
unsigned rdev
;
190 static __initdata u32 hdr_csum
;
192 static void __init
parse_header(char *s
)
194 unsigned long parsed
[13];
199 for (i
= 0, s
+= 6; i
< 13; i
++, s
+= 8) {
201 parsed
[i
] = simple_strtoul(buf
, NULL
, 16);
208 mtime
= parsed
[5]; /* breaks in y2106 */
209 body_len
= parsed
[6];
212 rdev
= new_encode_dev(MKDEV(parsed
[9], parsed
[10]));
213 name_len
= parsed
[11];
214 hdr_csum
= parsed
[12];
219 static __initdata
enum state
{
230 static __initdata
char *victim
;
231 static unsigned long byte_count __initdata
;
232 static __initdata loff_t this_header
, next_header
;
234 static inline void __init
eat(unsigned n
)
241 static __initdata
char *collected
;
242 static long remains __initdata
;
243 static __initdata
char *collect
;
245 static void __init
read_into(char *buf
, unsigned size
, enum state next
)
247 if (byte_count
>= size
) {
252 collect
= collected
= buf
;
259 static __initdata
char *header_buf
, *symlink_buf
, *name_buf
;
261 static int __init
do_start(void)
263 read_into(header_buf
, 110, GotHeader
);
267 static int __init
do_collect(void)
269 unsigned long n
= remains
;
272 memcpy(collect
, victim
, n
);
275 if ((remains
-= n
) != 0)
281 static int __init
do_header(void)
283 if (!memcmp(collected
, "070701", 6)) {
284 csum_present
= false;
285 } else if (!memcmp(collected
, "070702", 6)) {
288 if (memcmp(collected
, "070707", 6) == 0)
289 error("incorrect cpio method used: use -H newc option");
291 error("no cpio magic");
294 parse_header(collected
);
295 next_header
= this_header
+ N_ALIGN(name_len
) + body_len
;
296 next_header
= (next_header
+ 3) & ~3;
298 if (name_len
<= 0 || name_len
> PATH_MAX
)
301 if (body_len
> PATH_MAX
)
303 collect
= collected
= symlink_buf
;
304 remains
= N_ALIGN(name_len
) + body_len
;
305 next_state
= GotSymlink
;
309 if (S_ISREG(mode
) || !body_len
)
310 read_into(name_buf
, N_ALIGN(name_len
), GotName
);
314 static int __init
do_skip(void)
316 if (this_header
+ byte_count
< next_header
) {
320 eat(next_header
- this_header
);
326 static int __init
do_reset(void)
328 while (byte_count
&& *victim
== '\0')
330 if (byte_count
&& (this_header
& 3))
331 error("broken padding");
335 static void __init
clean_path(char *path
, umode_t fmode
)
339 if (!init_stat(path
, &st
, AT_SYMLINK_NOFOLLOW
) &&
340 (st
.mode
^ fmode
) & S_IFMT
) {
341 if (S_ISDIR(st
.mode
))
348 static int __init
maybe_link(void)
351 char *old
= find_link(major
, minor
, ino
, mode
, collected
);
353 clean_path(collected
, 0);
354 return (init_link(old
, collected
) < 0) ? -1 : 1;
360 static __initdata
struct file
*wfile
;
361 static __initdata loff_t wfile_pos
;
363 static int __init
do_name(void)
367 if (strcmp(collected
, "TRAILER!!!") == 0) {
371 clean_path(collected
, mode
);
373 int ml
= maybe_link();
375 int openflags
= O_WRONLY
|O_CREAT
;
377 openflags
|= O_TRUNC
;
378 wfile
= filp_open(collected
, openflags
, mode
);
384 vfs_fchown(wfile
, uid
, gid
);
385 vfs_fchmod(wfile
, mode
);
387 vfs_truncate(&wfile
->f_path
, body_len
);
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
);
407 static int __init
do_copy(void)
409 if (byte_count
>= body_len
) {
410 if (xwrite(wfile
, victim
, body_len
, &wfile_pos
) != body_len
)
411 error("write error");
413 do_utime_path(&wfile
->f_path
, mtime
);
415 if (csum_present
&& io_csum
!= hdr_csum
)
416 error("bad data checksum");
421 if (xwrite(wfile
, victim
, byte_count
, &wfile_pos
) != byte_count
)
422 error("write error");
423 body_len
-= byte_count
;
429 static int __init
do_symlink(void)
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
);
441 static __initdata
int (*actions
[])(void) = {
443 [Collect
] = do_collect
,
444 [GotHeader
] = do_header
,
447 [CopyFile
] = do_copy
,
448 [GotSymlink
] = do_symlink
,
452 static long __init
write_buffer(char *buf
, unsigned long len
)
457 while (!actions
[state
]())
459 return len
- byte_count
;
462 static long __init
flush_buffer(void *bufv
, unsigned long len
)
469 while ((written
= write_buffer(buf
, len
)) < len
&& !message
) {
470 char c
= buf
[written
];
480 error("junk within compressed archive");
485 static unsigned long my_inptr __initdata
; /* index of next byte to be processed in inbuf */
487 #include <linux/decompress/generic.h>
489 static char * __init
unpack_to_rootfs(char *buf
, unsigned long len
)
492 decompress_fn decompress
;
493 const char *compress_name
;
494 static __initdata
char msg_buf
[64];
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
);
500 if (!header_buf
|| !symlink_buf
|| !name_buf
)
501 panic_show_mem("can't allocate buffers");
506 while (!message
&& len
) {
507 loff_t saved_offset
= this_header
;
508 if (*buf
== '0' && !(this_header
& 3)) {
510 written
= write_buffer(buf
, len
);
522 decompress
= decompress_method(buf
, len
, &compress_name
);
523 pr_debug("Detected %s compressed data\n", compress_name
);
525 int res
= decompress(buf
, len
, NULL
, flush_buffer
, NULL
,
528 error("decompressor failed");
529 } else if (compress_name
) {
531 snprintf(msg_buf
, sizeof msg_buf
,
532 "compression method %s not configured",
537 error("invalid magic at start of compressed archive");
539 error("junk at the end of compressed archive");
540 this_header
= saved_offset
+ my_inptr
;
551 static int __initdata do_retain_initrd
;
553 static int __init
retain_initrd_param(char *str
)
557 do_retain_initrd
= 1;
560 __setup("retain_initrd", retain_initrd_param
);
562 #ifdef CONFIG_ARCH_HAS_KEEPINITRD
563 static int __init
keepinitrd_setup(char *__unused
)
565 do_retain_initrd
= 1;
568 __setup("keepinitrd", keepinitrd_setup
);
571 static bool __initdata initramfs_async
= true;
572 static int __init
initramfs_async_setup(char *str
)
574 strtobool(str
, &initramfs_async
);
577 __setup("initramfs_async=", initramfs_async_setup
);
579 extern char __initramfs_start
[];
580 extern unsigned long __initramfs_size
;
581 #include <linux/initrd.h>
582 #include <linux/kexec.h>
584 void __init
reserve_initrd_mem(void)
589 /* Ignore the virtul address computed during device tree parsing */
590 initrd_start
= initrd_end
= 0;
592 if (!phys_initrd_size
)
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.
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
);
604 if (!memblock_is_region_memory(start
, size
)) {
605 pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region",
610 if (memblock_is_region_reserved(start
, size
)) {
611 pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region\n",
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;
624 pr_cont(" - disabling initrd\n");
629 void __weak __init
free_initrd_mem(unsigned long start
, unsigned long end
)
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
);
635 memblock_free((void *)aligned_start
, aligned_end
- aligned_start
);
638 free_reserved_area((void *)start
, (void *)end
, POISON_FREE_INITMEM
,
642 #ifdef CONFIG_KEXEC_CORE
643 static bool __init
kexec_free_initrd(void)
645 unsigned long crashk_start
= (unsigned long)__va(crashk_res
.start
);
646 unsigned long crashk_end
= (unsigned long)__va(crashk_res
.end
);
649 * If the initrd region is overlapped with crashkernel reserved region,
650 * free only memory that is not part of crashkernel region.
652 if (initrd_start
>= crashk_end
|| initrd_end
<= crashk_start
)
656 * Initialize initrd memory region since the kexec boot does not do.
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
);
666 static inline bool kexec_free_initrd(void)
670 #endif /* CONFIG_KEXEC_CORE */
672 #ifdef CONFIG_BLK_DEV_RAM
673 static void __init
populate_initrd_image(char *err
)
679 unpack_to_rootfs(__initramfs_start
, __initramfs_size
);
681 printk(KERN_INFO
"rootfs image is not initramfs (%s); looks like an initrd\n",
683 file
= filp_open("/initrd.image", O_WRONLY
| O_CREAT
, 0700);
687 written
= xwrite(file
, (char *)initrd_start
, initrd_end
- initrd_start
,
689 if (written
!= initrd_end
- initrd_start
)
690 pr_err("/initrd.image: incomplete write (%zd != %ld)\n",
691 written
, initrd_end
- initrd_start
);
694 #endif /* CONFIG_BLK_DEV_RAM */
696 static void __init
do_populate_rootfs(void *unused
, async_cookie_t cookie
)
698 /* Load the built in initramfs */
699 char *err
= unpack_to_rootfs(__initramfs_start
, __initramfs_size
);
701 panic_show_mem("%s", err
); /* Failed to decompress INTERNAL initramfs */
703 if (!initrd_start
|| IS_ENABLED(CONFIG_INITRAMFS_FORCE
))
706 if (IS_ENABLED(CONFIG_BLK_DEV_RAM
))
707 printk(KERN_INFO
"Trying to unpack rootfs image as initramfs...\n");
709 printk(KERN_INFO
"Unpacking initramfs...\n");
711 err
= unpack_to_rootfs((char *)initrd_start
, initrd_end
- initrd_start
);
713 #ifdef CONFIG_BLK_DEV_RAM
714 populate_initrd_image(err
);
716 printk(KERN_EMERG
"Initramfs unpacking failed: %s\n", err
);
722 * If the initrd region is overlapped with crashkernel reserved region,
723 * free only memory that is not part of crashkernel region.
725 if (!do_retain_initrd
&& initrd_start
&& !kexec_free_initrd())
726 free_initrd_mem(initrd_start
, initrd_end
);
730 flush_delayed_fput();
734 static ASYNC_DOMAIN_EXCLUSIVE(initramfs_domain
);
735 static async_cookie_t initramfs_cookie
;
737 void wait_for_initramfs(void)
739 if (!initramfs_cookie
) {
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.
746 pr_warn_once("wait_for_initramfs() called before rootfs_initcalls\n");
749 async_synchronize_cookie_domain(initramfs_cookie
+ 1, &initramfs_domain
);
751 EXPORT_SYMBOL_GPL(wait_for_initramfs
);
753 static int __init
populate_rootfs(void)
755 initramfs_cookie
= async_schedule_domain(do_populate_rootfs
, NULL
,
757 usermodehelper_enable();
758 if (!initramfs_async
)
759 wait_for_initramfs();
762 rootfs_initcall(populate_rootfs
);