531 lines
11 KiB
C
531 lines
11 KiB
C
#include <linux/init.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/types.h>
|
|
#include <linux/fcntl.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/string.h>
|
|
#include <linux/syscalls.h>
|
|
|
|
static __initdata char *message;
|
|
static void __init error(char *x)
|
|
{
|
|
if (!message)
|
|
message = x;
|
|
}
|
|
|
|
static void __init *malloc(size_t size)
|
|
{
|
|
return kmalloc(size, GFP_KERNEL);
|
|
}
|
|
|
|
static void __init free(void *where)
|
|
{
|
|
kfree(where);
|
|
}
|
|
|
|
/* link hash */
|
|
|
|
static __initdata struct hash {
|
|
int ino, minor, major;
|
|
struct hash *next;
|
|
char *name;
|
|
} *head[32];
|
|
|
|
static inline int hash(int major, int minor, int ino)
|
|
{
|
|
unsigned long tmp = ino + minor + (major << 3);
|
|
tmp += tmp >> 5;
|
|
return tmp & 31;
|
|
}
|
|
|
|
static char __init *find_link(int major, int minor, int ino, char *name)
|
|
{
|
|
struct hash **p, *q;
|
|
for (p = head + hash(major, minor, ino); *p; p = &(*p)->next) {
|
|
if ((*p)->ino != ino)
|
|
continue;
|
|
if ((*p)->minor != minor)
|
|
continue;
|
|
if ((*p)->major != major)
|
|
continue;
|
|
return (*p)->name;
|
|
}
|
|
q = (struct hash *)malloc(sizeof(struct hash));
|
|
if (!q)
|
|
panic("can't allocate link hash entry");
|
|
q->ino = ino;
|
|
q->minor = minor;
|
|
q->major = major;
|
|
q->name = name;
|
|
q->next = NULL;
|
|
*p = q;
|
|
return NULL;
|
|
}
|
|
|
|
static void __init free_hash(void)
|
|
{
|
|
struct hash **p, *q;
|
|
for (p = head; p < head + 32; p++) {
|
|
while (*p) {
|
|
q = *p;
|
|
*p = q->next;
|
|
free(q);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* cpio header parsing */
|
|
|
|
static __initdata unsigned long ino, major, minor, nlink;
|
|
static __initdata mode_t mode;
|
|
static __initdata unsigned long body_len, name_len;
|
|
static __initdata uid_t uid;
|
|
static __initdata gid_t gid;
|
|
static __initdata unsigned rdev;
|
|
|
|
static void __init parse_header(char *s)
|
|
{
|
|
unsigned long parsed[12];
|
|
char buf[9];
|
|
int i;
|
|
|
|
buf[8] = '\0';
|
|
for (i = 0, s += 6; i < 12; i++, s += 8) {
|
|
memcpy(buf, s, 8);
|
|
parsed[i] = simple_strtoul(buf, NULL, 16);
|
|
}
|
|
ino = parsed[0];
|
|
mode = parsed[1];
|
|
uid = parsed[2];
|
|
gid = parsed[3];
|
|
nlink = parsed[4];
|
|
body_len = parsed[6];
|
|
major = parsed[7];
|
|
minor = parsed[8];
|
|
rdev = new_encode_dev(MKDEV(parsed[9], parsed[10]));
|
|
name_len = parsed[11];
|
|
}
|
|
|
|
/* FSM */
|
|
|
|
static __initdata enum state {
|
|
Start,
|
|
Collect,
|
|
GotHeader,
|
|
SkipIt,
|
|
GotName,
|
|
CopyFile,
|
|
GotSymlink,
|
|
Reset
|
|
} state, next_state;
|
|
|
|
static __initdata char *victim;
|
|
static __initdata unsigned count;
|
|
static __initdata loff_t this_header, next_header;
|
|
|
|
static __initdata int dry_run;
|
|
|
|
static inline void eat(unsigned n)
|
|
{
|
|
victim += n;
|
|
this_header += n;
|
|
count -= n;
|
|
}
|
|
|
|
#define N_ALIGN(len) ((((len) + 1) & ~3) + 2)
|
|
|
|
static __initdata char *collected;
|
|
static __initdata int remains;
|
|
static __initdata char *collect;
|
|
|
|
static void __init read_into(char *buf, unsigned size, enum state next)
|
|
{
|
|
if (count >= size) {
|
|
collected = victim;
|
|
eat(size);
|
|
state = next;
|
|
} else {
|
|
collect = collected = buf;
|
|
remains = size;
|
|
next_state = next;
|
|
state = Collect;
|
|
}
|
|
}
|
|
|
|
static __initdata char *header_buf, *symlink_buf, *name_buf;
|
|
|
|
static int __init do_start(void)
|
|
{
|
|
read_into(header_buf, 110, GotHeader);
|
|
return 0;
|
|
}
|
|
|
|
static int __init do_collect(void)
|
|
{
|
|
unsigned n = remains;
|
|
if (count < n)
|
|
n = count;
|
|
memcpy(collect, victim, n);
|
|
eat(n);
|
|
collect += n;
|
|
if ((remains -= n) != 0)
|
|
return 1;
|
|
state = next_state;
|
|
return 0;
|
|
}
|
|
|
|
static int __init do_header(void)
|
|
{
|
|
if (memcmp(collected, "070701", 6)) {
|
|
error("no cpio magic");
|
|
return 1;
|
|
}
|
|
parse_header(collected);
|
|
next_header = this_header + N_ALIGN(name_len) + body_len;
|
|
next_header = (next_header + 3) & ~3;
|
|
if (dry_run) {
|
|
read_into(name_buf, N_ALIGN(name_len), GotName);
|
|
return 0;
|
|
}
|
|
state = SkipIt;
|
|
if (name_len <= 0 || name_len > PATH_MAX)
|
|
return 0;
|
|
if (S_ISLNK(mode)) {
|
|
if (body_len > PATH_MAX)
|
|
return 0;
|
|
collect = collected = symlink_buf;
|
|
remains = N_ALIGN(name_len) + body_len;
|
|
next_state = GotSymlink;
|
|
state = Collect;
|
|
return 0;
|
|
}
|
|
if (S_ISREG(mode) || !body_len)
|
|
read_into(name_buf, N_ALIGN(name_len), GotName);
|
|
return 0;
|
|
}
|
|
|
|
static int __init do_skip(void)
|
|
{
|
|
if (this_header + count < next_header) {
|
|
eat(count);
|
|
return 1;
|
|
} else {
|
|
eat(next_header - this_header);
|
|
state = next_state;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static int __init do_reset(void)
|
|
{
|
|
while(count && *victim == '\0')
|
|
eat(1);
|
|
if (count && (this_header & 3))
|
|
error("broken padding");
|
|
return 1;
|
|
}
|
|
|
|
static int __init maybe_link(void)
|
|
{
|
|
if (nlink >= 2) {
|
|
char *old = find_link(major, minor, ino, collected);
|
|
if (old)
|
|
return (sys_link(old, collected) < 0) ? -1 : 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static __initdata int wfd;
|
|
|
|
static int __init do_name(void)
|
|
{
|
|
state = SkipIt;
|
|
next_state = Reset;
|
|
if (strcmp(collected, "TRAILER!!!") == 0) {
|
|
free_hash();
|
|
return 0;
|
|
}
|
|
if (dry_run)
|
|
return 0;
|
|
if (S_ISREG(mode)) {
|
|
if (maybe_link() >= 0) {
|
|
wfd = sys_open(collected, O_WRONLY|O_CREAT, mode);
|
|
if (wfd >= 0) {
|
|
sys_fchown(wfd, uid, gid);
|
|
sys_fchmod(wfd, mode);
|
|
state = CopyFile;
|
|
}
|
|
}
|
|
} else if (S_ISDIR(mode)) {
|
|
sys_mkdir(collected, mode);
|
|
sys_chown(collected, uid, gid);
|
|
sys_chmod(collected, mode);
|
|
} else if (S_ISBLK(mode) || S_ISCHR(mode) ||
|
|
S_ISFIFO(mode) || S_ISSOCK(mode)) {
|
|
if (maybe_link() == 0) {
|
|
sys_mknod(collected, mode, rdev);
|
|
sys_chown(collected, uid, gid);
|
|
sys_chmod(collected, mode);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int __init do_copy(void)
|
|
{
|
|
if (count >= body_len) {
|
|
sys_write(wfd, victim, body_len);
|
|
sys_close(wfd);
|
|
eat(body_len);
|
|
state = SkipIt;
|
|
return 0;
|
|
} else {
|
|
sys_write(wfd, victim, count);
|
|
body_len -= count;
|
|
eat(count);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
static int __init do_symlink(void)
|
|
{
|
|
collected[N_ALIGN(name_len) + body_len] = '\0';
|
|
sys_symlink(collected + N_ALIGN(name_len), collected);
|
|
sys_lchown(collected, uid, gid);
|
|
state = SkipIt;
|
|
next_state = Reset;
|
|
return 0;
|
|
}
|
|
|
|
static __initdata int (*actions[])(void) = {
|
|
[Start] = do_start,
|
|
[Collect] = do_collect,
|
|
[GotHeader] = do_header,
|
|
[SkipIt] = do_skip,
|
|
[GotName] = do_name,
|
|
[CopyFile] = do_copy,
|
|
[GotSymlink] = do_symlink,
|
|
[Reset] = do_reset,
|
|
};
|
|
|
|
static int __init write_buffer(char *buf, unsigned len)
|
|
{
|
|
count = len;
|
|
victim = buf;
|
|
|
|
while (!actions[state]())
|
|
;
|
|
return len - count;
|
|
}
|
|
|
|
static void __init flush_buffer(char *buf, unsigned len)
|
|
{
|
|
int written;
|
|
if (message)
|
|
return;
|
|
while ((written = write_buffer(buf, len)) < len && !message) {
|
|
char c = buf[written];
|
|
if (c == '0') {
|
|
buf += written;
|
|
len -= written;
|
|
state = Start;
|
|
} else if (c == 0) {
|
|
buf += written;
|
|
len -= written;
|
|
state = Reset;
|
|
} else
|
|
error("junk in compressed archive");
|
|
}
|
|
}
|
|
|
|
/*
|
|
* gzip declarations
|
|
*/
|
|
|
|
#define OF(args) args
|
|
|
|
#ifndef memzero
|
|
#define memzero(s, n) memset ((s), 0, (n))
|
|
#endif
|
|
|
|
typedef unsigned char uch;
|
|
typedef unsigned short ush;
|
|
typedef unsigned long ulg;
|
|
|
|
#define WSIZE 0x8000 /* window size--must be a power of two, and */
|
|
/* at least 32K for zip's deflate method */
|
|
|
|
static uch *inbuf;
|
|
static uch *window;
|
|
|
|
static unsigned insize; /* valid bytes in inbuf */
|
|
static unsigned inptr; /* index of next byte to be processed in inbuf */
|
|
static unsigned outcnt; /* bytes in output buffer */
|
|
static long bytes_out;
|
|
|
|
#define get_byte() (inptr < insize ? inbuf[inptr++] : -1)
|
|
|
|
/* Diagnostic functions (stubbed out) */
|
|
#define Assert(cond,msg)
|
|
#define Trace(x)
|
|
#define Tracev(x)
|
|
#define Tracevv(x)
|
|
#define Tracec(c,x)
|
|
#define Tracecv(c,x)
|
|
|
|
#define STATIC static
|
|
#define INIT __init
|
|
|
|
static void __init flush_window(void);
|
|
static void __init error(char *m);
|
|
static void __init gzip_mark(void **);
|
|
static void __init gzip_release(void **);
|
|
|
|
#include "../lib/inflate.c"
|
|
|
|
static void __init gzip_mark(void **ptr)
|
|
{
|
|
}
|
|
|
|
static void __init gzip_release(void **ptr)
|
|
{
|
|
}
|
|
|
|
/* ===========================================================================
|
|
* Write the output window window[0..outcnt-1] and update crc and bytes_out.
|
|
* (Used for the decompressed data only.)
|
|
*/
|
|
static void __init flush_window(void)
|
|
{
|
|
ulg c = crc; /* temporary variable */
|
|
unsigned n;
|
|
uch *in, ch;
|
|
|
|
flush_buffer(window, outcnt);
|
|
in = window;
|
|
for (n = 0; n < outcnt; n++) {
|
|
ch = *in++;
|
|
c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
|
|
}
|
|
crc = c;
|
|
bytes_out += (ulg)outcnt;
|
|
outcnt = 0;
|
|
}
|
|
|
|
static char * __init unpack_to_rootfs(char *buf, unsigned len, int check_only)
|
|
{
|
|
int written;
|
|
dry_run = check_only;
|
|
header_buf = malloc(110);
|
|
symlink_buf = malloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1);
|
|
name_buf = malloc(N_ALIGN(PATH_MAX));
|
|
window = malloc(WSIZE);
|
|
if (!window || !header_buf || !symlink_buf || !name_buf)
|
|
panic("can't allocate buffers");
|
|
state = Start;
|
|
this_header = 0;
|
|
message = NULL;
|
|
while (!message && len) {
|
|
loff_t saved_offset = this_header;
|
|
if (*buf == '0' && !(this_header & 3)) {
|
|
state = Start;
|
|
written = write_buffer(buf, len);
|
|
buf += written;
|
|
len -= written;
|
|
continue;
|
|
}
|
|
if (!*buf) {
|
|
buf++;
|
|
len--;
|
|
this_header++;
|
|
continue;
|
|
}
|
|
this_header = 0;
|
|
insize = len;
|
|
inbuf = buf;
|
|
inptr = 0;
|
|
outcnt = 0; /* bytes in output buffer */
|
|
bytes_out = 0;
|
|
crc = (ulg)0xffffffffL; /* shift register contents */
|
|
makecrc();
|
|
gunzip();
|
|
if (state != Reset)
|
|
error("junk in gzipped archive");
|
|
this_header = saved_offset + inptr;
|
|
buf += inptr;
|
|
len -= inptr;
|
|
}
|
|
free(window);
|
|
free(name_buf);
|
|
free(symlink_buf);
|
|
free(header_buf);
|
|
return message;
|
|
}
|
|
|
|
extern char __initramfs_start[], __initramfs_end[];
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
#include <linux/initrd.h>
|
|
#include <linux/kexec.h>
|
|
|
|
static void __init free_initrd(void)
|
|
{
|
|
#ifdef CONFIG_KEXEC
|
|
unsigned long crashk_start = (unsigned long)__va(crashk_res.start);
|
|
unsigned long crashk_end = (unsigned long)__va(crashk_res.end);
|
|
|
|
/*
|
|
* If the initrd region is overlapped with crashkernel reserved region,
|
|
* free only memory that is not part of crashkernel region.
|
|
*/
|
|
if (initrd_start < crashk_end && initrd_end > crashk_start) {
|
|
/*
|
|
* Initialize initrd memory region since the kexec boot does
|
|
* not do.
|
|
*/
|
|
memset((void *)initrd_start, 0, initrd_end - initrd_start);
|
|
if (initrd_start < crashk_start)
|
|
free_initrd_mem(initrd_start, crashk_start);
|
|
if (initrd_end > crashk_end)
|
|
free_initrd_mem(crashk_end, initrd_end);
|
|
} else
|
|
#endif
|
|
free_initrd_mem(initrd_start, initrd_end);
|
|
|
|
initrd_start = 0;
|
|
initrd_end = 0;
|
|
}
|
|
|
|
#endif
|
|
|
|
void __init populate_rootfs(void)
|
|
{
|
|
char *err = unpack_to_rootfs(__initramfs_start,
|
|
__initramfs_end - __initramfs_start, 0);
|
|
if (err)
|
|
panic(err);
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
if (initrd_start) {
|
|
int fd;
|
|
printk(KERN_INFO "checking if image is initramfs...");
|
|
err = unpack_to_rootfs((char *)initrd_start,
|
|
initrd_end - initrd_start, 1);
|
|
if (!err) {
|
|
printk(" it is\n");
|
|
unpack_to_rootfs((char *)initrd_start,
|
|
initrd_end - initrd_start, 0);
|
|
free_initrd();
|
|
return;
|
|
}
|
|
printk("it isn't (%s); looks like an initrd\n", err);
|
|
fd = sys_open("/initrd.image", O_WRONLY|O_CREAT, 700);
|
|
if (fd >= 0) {
|
|
sys_write(fd, (char *)initrd_start,
|
|
initrd_end - initrd_start);
|
|
sys_close(fd);
|
|
free_initrd();
|
|
}
|
|
}
|
|
#endif
|
|
}
|