// https://syzkaller.appspot.com/bug?id=8c2fb450154a0237dca69a04d14de4ea29048e55
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <arpa/inet.h>
#include <endian.h>
#include <errno.h>
#include <errno.h>
#include <fcntl.h>
#include <linux/if.h>
#include <linux/if_ether.h>
#include <linux/if_tun.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <net/if_arp.h>
#include <sched.h>
#include <signal.h>
#include <stdarg.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/uio.h>
#include <sys/wait.h>
#include <unistd.h>

__attribute__((noreturn)) static void doexit(int status)
{
  volatile unsigned i;
  syscall(__NR_exit_group, status);
  for (i = 0;; i++) {
  }
}
#include <errno.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>

const int kFailStatus = 67;
const int kRetryStatus = 69;

static void fail(const char* msg, ...)
{
  int e = errno;
  va_list args;
  va_start(args, msg);
  vfprintf(stderr, msg, args);
  va_end(args);
  fprintf(stderr, " (errno %d)\n", e);
  doexit((e == ENOMEM || e == EAGAIN) ? kRetryStatus : kFailStatus);
}

static void vsnprintf_check(char* str, size_t size, const char* format,
                            va_list args)
{
  int rv;

  rv = vsnprintf(str, size, format, args);
  if (rv < 0)
    fail("tun: snprintf failed");
  if ((size_t)rv >= size)
    fail("tun: string '%s...' doesn't fit into buffer", str);
}

#define COMMAND_MAX_LEN 128
#define PATH_PREFIX                                                            \
  "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin "
#define PATH_PREFIX_LEN (sizeof(PATH_PREFIX) - 1)

static void execute_command(bool panic, const char* format, ...)
{
  va_list args;
  char command[PATH_PREFIX_LEN + COMMAND_MAX_LEN];
  int rv;

  va_start(args, format);
  memcpy(command, PATH_PREFIX, PATH_PREFIX_LEN);
  vsnprintf_check(command + PATH_PREFIX_LEN, COMMAND_MAX_LEN, format, args);
  va_end(args);
  rv = system(command);
  if (rv) {
    if (panic)
      fail("command '%s' failed: %d", &command[0], rv);
  }
}

#define DEV_IPV4 "172.20.20.%d"
#define DEV_IPV6 "fe80::%02hx"
#define DEV_MAC "aa:aa:aa:aa:aa:%02hx"

static void snprintf_check(char* str, size_t size, const char* format, ...)
{
  va_list args;

  va_start(args, format);
  vsnprintf_check(str, size, format, args);
  va_end(args);
}

static void initialize_netdevices(void)
{
  unsigned i;
  const char* devtypes[] = {"ip6gretap", "bridge", "vcan", "bond", "team"};
  const char* devnames[] = {"lo",
                            "sit0",
                            "bridge0",
                            "vcan0",
                            "tunl0",
                            "gre0",
                            "gretap0",
                            "ip_vti0",
                            "ip6_vti0",
                            "ip6tnl0",
                            "ip6gre0",
                            "ip6gretap0",
                            "erspan0",
                            "bond0",
                            "veth0",
                            "veth1",
                            "team0",
                            "veth0_to_bridge",
                            "veth1_to_bridge",
                            "veth0_to_bond",
                            "veth1_to_bond",
                            "veth0_to_team",
                            "veth1_to_team"};
  const char* devmasters[] = {"bridge", "bond", "team"};

  for (i = 0; i < sizeof(devtypes) / (sizeof(devtypes[0])); i++)
    execute_command(0, "ip link add dev %s0 type %s", devtypes[i], devtypes[i]);
  execute_command(0, "ip link add type veth");

  for (i = 0; i < sizeof(devmasters) / (sizeof(devmasters[0])); i++) {
    execute_command(
        0, "ip link add name %s_slave_0 type veth peer name veth0_to_%s",
        devmasters[i], devmasters[i]);
    execute_command(
        0, "ip link add name %s_slave_1 type veth peer name veth1_to_%s",
        devmasters[i], devmasters[i]);
    execute_command(0, "ip link set %s_slave_0 master %s0", devmasters[i],
                    devmasters[i]);
    execute_command(0, "ip link set %s_slave_1 master %s0", devmasters[i],
                    devmasters[i]);
    execute_command(0, "ip link set veth0_to_%s up", devmasters[i]);
    execute_command(0, "ip link set veth1_to_%s up", devmasters[i]);
  }
  execute_command(0, "ip link set bridge_slave_0 up");
  execute_command(0, "ip link set bridge_slave_1 up");

  for (i = 0; i < sizeof(devnames) / (sizeof(devnames[0])); i++) {
    char addr[32];
    snprintf_check(addr, sizeof(addr), DEV_IPV4, i + 10);
    execute_command(0, "ip -4 addr add %s/24 dev %s", addr, devnames[i]);
    snprintf_check(addr, sizeof(addr), DEV_IPV6, i + 10);
    execute_command(0, "ip -6 addr add %s/120 dev %s", addr, devnames[i]);
    snprintf_check(addr, sizeof(addr), DEV_MAC, i + 10);
    execute_command(0, "ip link set dev %s address %s", devnames[i], addr);
    execute_command(0, "ip link set dev %s up", devnames[i]);
  }
}

static void loop();

static void sandbox_common()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
  setsid();

  struct rlimit rlim;
  rlim.rlim_cur = rlim.rlim_max = 160 << 20;
  setrlimit(RLIMIT_AS, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 8 << 20;
  setrlimit(RLIMIT_MEMLOCK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 136 << 20;
  setrlimit(RLIMIT_FSIZE, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 1 << 20;
  setrlimit(RLIMIT_STACK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 0;
  setrlimit(RLIMIT_CORE, &rlim);

  if (unshare(CLONE_NEWNS)) {
  }
  if (unshare(CLONE_NEWIPC)) {
  }
  if (unshare(0x02000000)) {
  }
  if (unshare(CLONE_NEWUTS)) {
  }
  if (unshare(CLONE_SYSVSEM)) {
  }
}

int wait_for_loop(int pid)
{
  if (pid < 0)
    fail("sandbox fork failed");
  int status = 0;
  while (waitpid(-1, &status, __WALL) != pid) {
  }
  return WEXITSTATUS(status);
}

static int do_sandbox_none(void)
{
  if (unshare(CLONE_NEWPID)) {
  }
  int pid = fork();
  if (pid != 0)
    return wait_for_loop(pid);

  sandbox_common();
  if (unshare(CLONE_NEWNET)) {
  }
  initialize_netdevices();
  loop();
  doexit(1);
}

static void execute_one();
extern unsigned long long procid;

void loop()
{
  while (1) {
    execute_one();
  }
}

uint64_t r[1] = {0xffffffffffffffff};
void execute_one()
{
  long res = 0;
  res = syscall(__NR_socket, 0xa, 3, 0x3c);
  if (res != -1)
    r[0] = res;
  *(uint16_t*)0x20000180 = 0xa;
  *(uint16_t*)0x20000182 = htobe16(0);
  *(uint32_t*)0x20000184 = 0;
  *(uint8_t*)0x20000188 = 0xfe;
  *(uint8_t*)0x20000189 = 0x80;
  *(uint8_t*)0x2000018a = 0;
  *(uint8_t*)0x2000018b = 0;
  *(uint8_t*)0x2000018c = 0;
  *(uint8_t*)0x2000018d = 0;
  *(uint8_t*)0x2000018e = 0;
  *(uint8_t*)0x2000018f = 0;
  *(uint8_t*)0x20000190 = 0;
  *(uint8_t*)0x20000191 = 0;
  *(uint8_t*)0x20000192 = 0;
  *(uint8_t*)0x20000193 = 0;
  *(uint8_t*)0x20000194 = 0;
  *(uint8_t*)0x20000195 = 0;
  *(uint8_t*)0x20000196 = 0;
  *(uint8_t*)0x20000197 = 0xbb;
  *(uint32_t*)0x20000198 = 9;
  syscall(__NR_connect, r[0], 0x20000180, 0x1c);
  memcpy((void*)0x20000200, "!", 1);
  syscall(__NR_sendto, r[0], 0x20000200, 1, 0x8000, 0, 0);
  *(uint64_t*)0x20000040 = 0;
  *(uint32_t*)0x20000048 = 0;
  *(uint64_t*)0x20000050 = 0x20000080;
  *(uint64_t*)0x20000080 = 0x20000300;
  memcpy((void*)0x20000300,
         "\x11\x9a\x0e\x63\xc9\x47\x62\x88\xb6\x71\xaf\xdb\xd5\x3a\x59\x94\xe1"
         "\x37\x38\x1f\x62\x02\x1d\x19\x51\xb6\x27\xb8\xdd\xa5\x7a\x5d\x17\xd7"
         "\x44\x64\x8c\x81\xc5\x70\x3e\xd8\x14\x6a\xb1\xb0\x17\x1f\x89\x09\x1b"
         "\x1d\xd3\x23\xff\x07\xdb\xb6\x33\xfb\x38\x04\x84\x9f\x77\x68\xe5\x86"
         "\xdf\x46\x09\x63\x24\x5d\xed\xb4\x01\x3e\xe5\x55\xaf\x99\x49\x9e\x44"
         "\xad\x42\x0d\xbf\x65\xfd\x46\xfb\xc9\xba\x12\x74\x42\x9e\x2d\x57\x83"
         "\x75\x18\x15\x82\x8e\xc8\xcb\x35\x53\x11\x0c\xca\x66\x46\x02\x15\x35"
         "\x3d\x19\xf6\xd8\xbb\xd8\xfb\x08\xad\x04\x91\x63\x4a\xc2\xfd\x10\xe2"
         "\xcd\x30\xbc\xd7\xfe\xde\x24\x26\x3a\x7f\xff\x16\xe5\x3e\xa2\x93\xf3"
         "\x55\x1b\x71\x47\xc3\x3a\x44\xea\x43\x7f\xb1\xf7\x7f\x94\xdb\x4e\x65"
         "\x80\x75\x82\x99\x0a\x0a\x5e\xfd\xdf\x12\xde\x3c\xae\xa6\x61\x11\x73"
         "\xf9\x64\xde\x99\x64\x5e\x2c\x02\xbe\xf1\x38\xb4\x06\xca\x06\x44\x14"
         "\x6a\xe4\xbb\x91\xe0\x43\x8f\x8c\x47\xbe\xdd\xb0\xed\x22\xf5\x6b\xc0"
         "\x85\x1d\xef\x35\x82\x4c\xa6\xc7\x25\x8c",
         231);
  *(uint64_t*)0x20000088 = 0xe7;
  *(uint64_t*)0x20000058 = 1;
  *(uint64_t*)0x20000060 = 0x20003b40;
  *(uint64_t*)0x20000068 = 0;
  *(uint32_t*)0x20000070 = 0;
  syscall(__NR_sendmsg, r[0], 0x20000040, 0);
}

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