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