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/kstrtox.h>
15 #include <linux/memblock.h>
17 #include <linux/namei.h>
18 #include <linux/init_syscalls.h>
19 #include <linux/umh.h>
21 #include "do_mounts.h"
23 static __initdata
bool csum_present
;
24 static __initdata u32 io_csum
;
26 static ssize_t __init
xwrite(struct file
*file
, const unsigned char *p
,
27 size_t count
, loff_t
*pos
)
31 /* sys_write only can write MAX_RW_COUNT aka 2G-4K bytes at most */
33 ssize_t rv
= kernel_write(file
, p
, count
, pos
);
36 if (rv
== -EINTR
|| rv
== -EAGAIN
)
38 return out
? out
: rv
;
45 for (i
= 0; i
< rv
; i
++)
57 static __initdata
char *message
;
58 static void __init
error(char *x
)
64 #define panic_show_mem(fmt, ...) \
65 ({ show_mem(); panic(fmt, ##__VA_ARGS__); })
69 #define N_ALIGN(len) ((((len) + 1) & ~3) + 2)
71 static __initdata
struct hash
{
72 int ino
, minor
, major
;
75 char name
[N_ALIGN(PATH_MAX
)];
78 static inline int hash(int major
, int minor
, int ino
)
80 unsigned long tmp
= ino
+ minor
+ (major
<< 3);
85 static char __init
*find_link(int major
, int minor
, int ino
,
86 umode_t mode
, char *name
)
89 for (p
= head
+ hash(major
, minor
, ino
); *p
; p
= &(*p
)->next
) {
92 if ((*p
)->minor
!= minor
)
94 if ((*p
)->major
!= major
)
96 if (((*p
)->mode
^ mode
) & S_IFMT
)
100 q
= kmalloc(sizeof(struct hash
), GFP_KERNEL
);
102 panic_show_mem("can't allocate link hash entry");
107 strcpy(q
->name
, name
);
113 static void __init
free_hash(void)
116 for (p
= head
; p
< head
+ 32; p
++) {
125 #ifdef CONFIG_INITRAMFS_PRESERVE_MTIME
126 static void __init
do_utime(char *filename
, time64_t mtime
)
128 struct timespec64 t
[2] = { { .tv_sec
= mtime
}, { .tv_sec
= mtime
} };
129 init_utimes(filename
, t
);
132 static void __init
do_utime_path(const struct path
*path
, time64_t mtime
)
134 struct timespec64 t
[2] = { { .tv_sec
= mtime
}, { .tv_sec
= mtime
} };
138 static __initdata
LIST_HEAD(dir_list
);
140 struct list_head list
;
145 static void __init
dir_add(const char *name
, time64_t mtime
)
147 size_t nlen
= strlen(name
) + 1;
148 struct dir_entry
*de
;
150 de
= kmalloc(sizeof(struct dir_entry
) + nlen
, GFP_KERNEL
);
152 panic_show_mem("can't allocate dir_entry buffer");
153 INIT_LIST_HEAD(&de
->list
);
154 strscpy(de
->name
, name
, nlen
);
156 list_add(&de
->list
, &dir_list
);
159 static void __init
dir_utime(void)
161 struct dir_entry
*de
, *tmp
;
162 list_for_each_entry_safe(de
, tmp
, &dir_list
, list
) {
164 do_utime(de
->name
, de
->mtime
);
169 static void __init
do_utime(char *filename
, time64_t mtime
) {}
170 static void __init
do_utime_path(const struct path
*path
, time64_t mtime
) {}
171 static void __init
dir_add(const char *name
, time64_t mtime
) {}
172 static void __init
dir_utime(void) {}
175 static __initdata time64_t mtime
;
177 /* cpio header parsing */
179 static __initdata
unsigned long ino
, major
, minor
, nlink
;
180 static __initdata umode_t mode
;
181 static __initdata
unsigned long body_len
, name_len
;
182 static __initdata uid_t uid
;
183 static __initdata gid_t gid
;
184 static __initdata
unsigned rdev
;
185 static __initdata u32 hdr_csum
;
187 static void __init
parse_header(char *s
)
189 unsigned long parsed
[13];
194 for (i
= 0, s
+= 6; i
< 13; i
++, s
+= 8) {
196 parsed
[i
] = simple_strtoul(buf
, NULL
, 16);
203 mtime
= parsed
[5]; /* breaks in y2106 */
204 body_len
= parsed
[6];
207 rdev
= new_encode_dev(MKDEV(parsed
[9], parsed
[10]));
208 name_len
= parsed
[11];
209 hdr_csum
= parsed
[12];
214 static __initdata
enum state
{
225 static __initdata
char *victim
;
226 static unsigned long byte_count __initdata
;
227 static __initdata loff_t this_header
, next_header
;
229 static inline void __init
eat(unsigned n
)
236 static __initdata
char *collected
;
237 static long remains __initdata
;
238 static __initdata
char *collect
;
240 static void __init
read_into(char *buf
, unsigned size
, enum state next
)
242 if (byte_count
>= size
) {
247 collect
= collected
= buf
;
254 static __initdata
char *header_buf
, *symlink_buf
, *name_buf
;
256 static int __init
do_start(void)
258 read_into(header_buf
, 110, GotHeader
);
262 static int __init
do_collect(void)
264 unsigned long n
= remains
;
267 memcpy(collect
, victim
, n
);
270 if ((remains
-= n
) != 0)
276 static int __init
do_header(void)
278 if (!memcmp(collected
, "070701", 6)) {
279 csum_present
= false;
280 } else if (!memcmp(collected
, "070702", 6)) {
283 if (memcmp(collected
, "070707", 6) == 0)
284 error("incorrect cpio method used: use -H newc option");
286 error("no cpio magic");
289 parse_header(collected
);
290 next_header
= this_header
+ N_ALIGN(name_len
) + body_len
;
291 next_header
= (next_header
+ 3) & ~3;
293 if (name_len
<= 0 || name_len
> PATH_MAX
)
296 if (body_len
> PATH_MAX
)
298 collect
= collected
= symlink_buf
;
299 remains
= N_ALIGN(name_len
) + body_len
;
300 next_state
= GotSymlink
;
304 if (S_ISREG(mode
) || !body_len
)
305 read_into(name_buf
, N_ALIGN(name_len
), GotName
);
309 static int __init
do_skip(void)
311 if (this_header
+ byte_count
< next_header
) {
315 eat(next_header
- this_header
);
321 static int __init
do_reset(void)
323 while (byte_count
&& *victim
== '\0')
325 if (byte_count
&& (this_header
& 3))
326 error("broken padding");
330 static void __init
clean_path(char *path
, umode_t fmode
)
334 if (!init_stat(path
, &st
, AT_SYMLINK_NOFOLLOW
) &&
335 (st
.mode
^ fmode
) & S_IFMT
) {
336 if (S_ISDIR(st
.mode
))
343 static int __init
maybe_link(void)
346 char *old
= find_link(major
, minor
, ino
, mode
, collected
);
348 clean_path(collected
, 0);
349 return (init_link(old
, collected
) < 0) ? -1 : 1;
355 static __initdata
struct file
*wfile
;
356 static __initdata loff_t wfile_pos
;
358 static int __init
do_name(void)
362 if (strcmp(collected
, "TRAILER!!!") == 0) {
366 clean_path(collected
, mode
);
368 int ml
= maybe_link();
370 int openflags
= O_WRONLY
|O_CREAT
;
372 openflags
|= O_TRUNC
;
373 wfile
= filp_open(collected
, openflags
, mode
);
379 vfs_fchown(wfile
, uid
, gid
);
380 vfs_fchmod(wfile
, mode
);
382 vfs_truncate(&wfile
->f_path
, body_len
);
385 } else if (S_ISDIR(mode
)) {
386 init_mkdir(collected
, mode
);
387 init_chown(collected
, uid
, gid
, 0);
388 init_chmod(collected
, mode
);
389 dir_add(collected
, mtime
);
390 } else if (S_ISBLK(mode
) || S_ISCHR(mode
) ||
391 S_ISFIFO(mode
) || S_ISSOCK(mode
)) {
392 if (maybe_link() == 0) {
393 init_mknod(collected
, mode
, rdev
);
394 init_chown(collected
, uid
, gid
, 0);
395 init_chmod(collected
, mode
);
396 do_utime(collected
, mtime
);
402 static int __init
do_copy(void)
404 if (byte_count
>= body_len
) {
405 if (xwrite(wfile
, victim
, body_len
, &wfile_pos
) != body_len
)
406 error("write error");
408 do_utime_path(&wfile
->f_path
, mtime
);
410 if (csum_present
&& io_csum
!= hdr_csum
)
411 error("bad data checksum");
416 if (xwrite(wfile
, victim
, byte_count
, &wfile_pos
) != byte_count
)
417 error("write error");
418 body_len
-= byte_count
;
424 static int __init
do_symlink(void)
426 collected
[N_ALIGN(name_len
) + body_len
] = '\0';
427 clean_path(collected
, 0);
428 init_symlink(collected
+ N_ALIGN(name_len
), collected
);
429 init_chown(collected
, uid
, gid
, AT_SYMLINK_NOFOLLOW
);
430 do_utime(collected
, mtime
);
436 static __initdata
int (*actions
[])(void) = {
438 [Collect
] = do_collect
,
439 [GotHeader
] = do_header
,
442 [CopyFile
] = do_copy
,
443 [GotSymlink
] = do_symlink
,
447 static long __init
write_buffer(char *buf
, unsigned long len
)
452 while (!actions
[state
]())
454 return len
- byte_count
;
457 static long __init
flush_buffer(void *bufv
, unsigned long len
)
464 while ((written
= write_buffer(buf
, len
)) < len
&& !message
) {
465 char c
= buf
[written
];
475 error("junk within compressed archive");
480 static unsigned long my_inptr __initdata
; /* index of next byte to be processed in inbuf */
482 #include <linux/decompress/generic.h>
484 static char * __init
unpack_to_rootfs(char *buf
, unsigned long len
)
487 decompress_fn decompress
;
488 const char *compress_name
;
489 static __initdata
char msg_buf
[64];
491 header_buf
= kmalloc(110, GFP_KERNEL
);
492 symlink_buf
= kmalloc(PATH_MAX
+ N_ALIGN(PATH_MAX
) + 1, GFP_KERNEL
);
493 name_buf
= kmalloc(N_ALIGN(PATH_MAX
), GFP_KERNEL
);
495 if (!header_buf
|| !symlink_buf
|| !name_buf
)
496 panic_show_mem("can't allocate buffers");
501 while (!message
&& len
) {
502 loff_t saved_offset
= this_header
;
503 if (*buf
== '0' && !(this_header
& 3)) {
505 written
= write_buffer(buf
, len
);
517 decompress
= decompress_method(buf
, len
, &compress_name
);
518 pr_debug("Detected %s compressed data\n", compress_name
);
520 int res
= decompress(buf
, len
, NULL
, flush_buffer
, NULL
,
523 error("decompressor failed");
524 } else if (compress_name
) {
526 snprintf(msg_buf
, sizeof msg_buf
,
527 "compression method %s not configured",
532 error("invalid magic at start of compressed archive");
534 error("junk at the end of compressed archive");
535 this_header
= saved_offset
+ my_inptr
;
546 static int __initdata do_retain_initrd
;
548 static int __init
retain_initrd_param(char *str
)
552 do_retain_initrd
= 1;
555 __setup("retain_initrd", retain_initrd_param
);
557 #ifdef CONFIG_ARCH_HAS_KEEPINITRD
558 static int __init
keepinitrd_setup(char *__unused
)
560 do_retain_initrd
= 1;
563 __setup("keepinitrd", keepinitrd_setup
);
566 static bool __initdata initramfs_async
= true;
567 static int __init
initramfs_async_setup(char *str
)
569 return kstrtobool(str
, &initramfs_async
) == 0;
571 __setup("initramfs_async=", initramfs_async_setup
);
573 extern char __initramfs_start
[];
574 extern unsigned long __initramfs_size
;
575 #include <linux/initrd.h>
576 #include <linux/kexec.h>
578 static ssize_t
raw_read(struct file
*file
, struct kobject
*kobj
,
579 struct bin_attribute
*attr
, char *buf
,
580 loff_t pos
, size_t count
)
582 memcpy(buf
, attr
->private + pos
, count
);
586 static BIN_ATTR(initrd
, 0440, raw_read
, NULL
, 0);
588 void __init
reserve_initrd_mem(void)
593 /* Ignore the virtul address computed during device tree parsing */
594 initrd_start
= initrd_end
= 0;
596 if (!phys_initrd_size
)
599 * Round the memory region to page boundaries as per free_initrd_mem()
600 * This allows us to detect whether the pages overlapping the initrd
601 * are in use, but more importantly, reserves the entire set of pages
602 * as we don't want these pages allocated for other purposes.
604 start
= round_down(phys_initrd_start
, PAGE_SIZE
);
605 size
= phys_initrd_size
+ (phys_initrd_start
- start
);
606 size
= round_up(size
, PAGE_SIZE
);
608 if (!memblock_is_region_memory(start
, size
)) {
609 pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region",
614 if (memblock_is_region_reserved(start
, size
)) {
615 pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region\n",
620 memblock_reserve(start
, size
);
621 /* Now convert initrd to virtual addresses */
622 initrd_start
= (unsigned long)__va(phys_initrd_start
);
623 initrd_end
= initrd_start
+ phys_initrd_size
;
624 initrd_below_start_ok
= 1;
628 pr_cont(" - disabling initrd\n");
633 void __weak __init
free_initrd_mem(unsigned long start
, unsigned long end
)
635 #ifdef CONFIG_ARCH_KEEP_MEMBLOCK
636 unsigned long aligned_start
= ALIGN_DOWN(start
, PAGE_SIZE
);
637 unsigned long aligned_end
= ALIGN(end
, PAGE_SIZE
);
639 memblock_free((void *)aligned_start
, aligned_end
- aligned_start
);
642 free_reserved_area((void *)start
, (void *)end
, POISON_FREE_INITMEM
,
646 #ifdef CONFIG_KEXEC_CORE
647 static bool __init
kexec_free_initrd(void)
649 unsigned long crashk_start
= (unsigned long)__va(crashk_res
.start
);
650 unsigned long crashk_end
= (unsigned long)__va(crashk_res
.end
);
653 * If the initrd region is overlapped with crashkernel reserved region,
654 * free only memory that is not part of crashkernel region.
656 if (initrd_start
>= crashk_end
|| initrd_end
<= crashk_start
)
660 * Initialize initrd memory region since the kexec boot does not do.
662 memset((void *)initrd_start
, 0, initrd_end
- initrd_start
);
663 if (initrd_start
< crashk_start
)
664 free_initrd_mem(initrd_start
, crashk_start
);
665 if (initrd_end
> crashk_end
)
666 free_initrd_mem(crashk_end
, initrd_end
);
670 static inline bool kexec_free_initrd(void)
674 #endif /* CONFIG_KEXEC_CORE */
676 #ifdef CONFIG_BLK_DEV_RAM
677 static void __init
populate_initrd_image(char *err
)
683 printk(KERN_INFO
"rootfs image is not initramfs (%s); looks like an initrd\n",
685 file
= filp_open("/initrd.image", O_WRONLY
| O_CREAT
, 0700);
689 written
= xwrite(file
, (char *)initrd_start
, initrd_end
- initrd_start
,
691 if (written
!= initrd_end
- initrd_start
)
692 pr_err("/initrd.image: incomplete write (%zd != %ld)\n",
693 written
, initrd_end
- initrd_start
);
696 #endif /* CONFIG_BLK_DEV_RAM */
698 static void __init
do_populate_rootfs(void *unused
, async_cookie_t cookie
)
700 /* Load the built in initramfs */
701 char *err
= unpack_to_rootfs(__initramfs_start
, __initramfs_size
);
703 panic_show_mem("%s", err
); /* Failed to decompress INTERNAL initramfs */
705 if (!initrd_start
|| IS_ENABLED(CONFIG_INITRAMFS_FORCE
))
708 if (IS_ENABLED(CONFIG_BLK_DEV_RAM
))
709 printk(KERN_INFO
"Trying to unpack rootfs image as initramfs...\n");
711 printk(KERN_INFO
"Unpacking initramfs...\n");
713 err
= unpack_to_rootfs((char *)initrd_start
, initrd_end
- initrd_start
);
715 #ifdef CONFIG_BLK_DEV_RAM
716 populate_initrd_image(err
);
718 printk(KERN_EMERG
"Initramfs unpacking failed: %s\n", err
);
724 * If the initrd region is overlapped with crashkernel reserved region,
725 * free only memory that is not part of crashkernel region.
727 if (!do_retain_initrd
&& initrd_start
&& !kexec_free_initrd()) {
728 free_initrd_mem(initrd_start
, initrd_end
);
729 } else if (do_retain_initrd
&& initrd_start
) {
730 bin_attr_initrd
.size
= initrd_end
- initrd_start
;
731 bin_attr_initrd
.private = (void *)initrd_start
;
732 if (sysfs_create_bin_file(firmware_kobj
, &bin_attr_initrd
))
733 pr_err("Failed to create initrd sysfs file");
741 static ASYNC_DOMAIN_EXCLUSIVE(initramfs_domain
);
742 static async_cookie_t initramfs_cookie
;
744 void wait_for_initramfs(void)
746 if (!initramfs_cookie
) {
748 * Something before rootfs_initcall wants to access
749 * the filesystem/initramfs. Probably a bug. Make a
750 * note, avoid deadlocking the machine, and let the
751 * caller's access fail as it used to.
753 pr_warn_once("wait_for_initramfs() called before rootfs_initcalls\n");
756 async_synchronize_cookie_domain(initramfs_cookie
+ 1, &initramfs_domain
);
758 EXPORT_SYMBOL_GPL(wait_for_initramfs
);
760 static int __init
populate_rootfs(void)
762 initramfs_cookie
= async_schedule_domain(do_populate_rootfs
, NULL
,
764 usermodehelper_enable();
765 if (!initramfs_async
)
766 wait_for_initramfs();
769 rootfs_initcall(populate_rootfs
);