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/*
* 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.
*
* $Id: inject.c,v 1.3 1997/11/26 02:32:27 deraadt 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, 0);
munmap(kern, kernlen);
munmap(filesys, filesyslen);
exit(0);
}
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