125 lines
3.5 KiB
C
125 lines
3.5 KiB
C
/*
|
|
* Copyright (c) 1995 Matthias Pfaller.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by Matthias Pfaller.
|
|
* 4. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* $NetBSD: inject.c,v 1.3 1998/01/06 04:45:24 perry Exp $
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
#include <fcntl.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/mman.h>
|
|
#include <bm.h>
|
|
|
|
/*
|
|
* Map a file
|
|
*/
|
|
|
|
void *map(char *file, int mode, int *len)
|
|
{
|
|
int fd;
|
|
struct stat sb;
|
|
void *p;
|
|
|
|
/* Open the file we'd like map */
|
|
fd = open(file, mode);
|
|
if (fd < 0) {
|
|
perror(file);
|
|
exit(1);
|
|
}
|
|
|
|
/* Get the length of the file */
|
|
if (fstat(fd, &sb) < 0) {
|
|
perror("fstat");
|
|
exit(1);
|
|
}
|
|
|
|
/* Return the length of file in len */
|
|
*len = sb.st_size;
|
|
|
|
/* Now map the file */
|
|
p = mmap(NULL, *len, PROT_READ | (mode == O_RDWR ? PROT_WRITE : 0),
|
|
MAP_SHARED, fd, 0);
|
|
if (p == NULL) {
|
|
perror("mmap");
|
|
exit(1);
|
|
}
|
|
|
|
/*
|
|
* We will access this mostly sequential.
|
|
* So let's tell it to the vm system.
|
|
*/
|
|
madvise(p, *len, MADV_SEQUENTIAL);
|
|
close(fd);
|
|
return(p);
|
|
}
|
|
|
|
main(int argc, char **argv)
|
|
{
|
|
void *kern, *filesys, *ramdisk;
|
|
int kernlen, filesyslen;
|
|
bm_pat *bm;
|
|
static char pattern[] = "Ramdiskorigin";
|
|
|
|
if (argc != 3) {
|
|
fprintf(stderr, "usage: %s kernel filesystem", argv[0]);
|
|
exit(1);
|
|
}
|
|
|
|
/* Map the kernel image read/write */
|
|
kern = map(argv[1], O_RDWR, &kernlen);
|
|
|
|
/* Map the filesystem image read only */
|
|
filesys = map(argv[2], O_RDONLY, &filesyslen);
|
|
|
|
/* Search the kernel image for the ramdisk signature */
|
|
bm = bm_comp(pattern, sizeof(pattern), NULL);
|
|
ramdisk = bm_exec(bm, kern, kernlen);
|
|
if (!ramdisk) {
|
|
fprintf(stderr, "Origin of ramdisk not found in kernel\n");
|
|
exit(1);
|
|
}
|
|
|
|
/* Does the filesystem image fit into the kernel image? */
|
|
if ((kernlen - (ramdisk - kern)) < filesyslen) {
|
|
fprintf(stderr, "Kernel image to small\n");
|
|
exit(1);
|
|
}
|
|
|
|
/* Copy the filesystem image into the kernel image */
|
|
memcpy(ramdisk, filesys, filesyslen);
|
|
|
|
/* Sync vm/fs and unmap the images */
|
|
msync(kern, kernlen);
|
|
munmap(kern, kernlen);
|
|
munmap(filesys, filesyslen);
|
|
exit(0);
|
|
}
|