#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>#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_mem(initrd_start, initrd_end); 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_mem(initrd_start, initrd_end); } }#endif}
#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>
#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_mem(initrd_start, initrd_end);
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_mem(initrd_start, initrd_end);
}
}
#endif
}