http://www.tjd.phlegethon.org/software/linux/kpeek.c/* * Hack to read a value in kernel space, when you can't be * bothered using sysctl. * * Copyright (c) 2002 Tim Deegan <[EMAIL PROTECTED]> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * $Id: kpeek.c,v 1.2 2002/03/26 12:13:38 tjd21 Exp $ */ #include <errno.h> #include <fcntl.h> #include <stdint.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <sys/stat.h> #include <sys/types.h> int main (int argc, char **argv) { int fd; uintptr_t addr, value; char *ap; errno = 0; if (argc != 2) { fprintf (stderr, "%s: reads a (%i-byte) word of kernel memory\n", argv[0], sizeof (value)); fprintf (stderr, "usage: %s <address>\n", argv[0]); exit(-1); } addr = strtoul(argv[1], &ap, 0); if (errno != 0 || ap == argv[1]) { fprintf (stderr, "usage: %s <address>\n", argv[0]); exit(-1); } fd = open("/dev/kmem", O_RDWR); if (fd == -1) { perror ("open() failed:"); exit (-1); } if (lseek (fd, addr, SEEK_SET) == -1) { perror ("lseek() failed:"); exit (-1); } if (read (fd, &value, sizeof(value)) != sizeof (value)) { perror ("read() failed:"); exit (-1); } printf ("%#x: %#x\n", addr, value); exit(0); } /* * EOF */ |