syzkaller-repros/linux/7c55aa81cbc65cf473aa67e7896f420e020a30ec.c

// KMSAN: uninit-value in ipv6_skip_exthdr
// https://syzkaller.appspot.com/bug?id=7c55aa81cbc65cf473aa67e7896f420e020a30ec
// status:invalid
// 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 <errno.h>
#include <fcntl.h>
#include <linux/genetlink.h>
#include <linux/if.h>
#include <linux/if_ether.h>
#include <linux/if_tun.h>
#include <linux/ip.h>
#include <linux/netlink.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 <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/types.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);
}

#define BITMASK_LEN(type, bf_len) (type)((1ull << (bf_len)) - 1)

#define BITMASK_LEN_OFF(type, bf_off, bf_len)                                  \
  (type)(BITMASK_LEN(type, (bf_len)) << (bf_off))

#define STORE_BY_BITMASK(type, addr, val, bf_off, bf_len)                      \
  if ((bf_off) == 0 && (bf_len) == 0) {                                        \
    *(type*)(addr) = (type)(val);                                              \
  } else {                                                                     \
    type new_val = *(type*)(addr);                                             \
    new_val &= ~BITMASK_LEN_OFF(type, (bf_off), (bf_len));                     \
    new_val |= ((type)(val)&BITMASK_LEN(type, (bf_len))) << (bf_off);          \
    *(type*)(addr) = new_val;                                                  \
  }

struct csum_inet {
  uint32_t acc;
};

static void csum_inet_init(struct csum_inet* csum)
{
  csum->acc = 0;
}

static void csum_inet_update(struct csum_inet* csum, const uint8_t* data,
                             size_t length)
{
  if (length == 0)
    return;

  size_t i;
  for (i = 0; i < length - 1; i += 2)
    csum->acc += *(uint16_t*)&data[i];

  if (length & 1)
    csum->acc += (uint16_t)data[length - 1];

  while (csum->acc > 0xffff)
    csum->acc = (csum->acc & 0xffff) + (csum->acc >> 16);
}

static uint16_t csum_inet_digest(struct csum_inet* csum)
{
  return ~csum->acc;
}

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);
}

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);
}

#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);
  }
}

static int tunfd = -1;
static int tun_frags_enabled;

#define SYZ_TUN_MAX_PACKET_SIZE 1000

#define TUN_IFACE "syz_tun"

#define LOCAL_MAC "aa:aa:aa:aa:aa:aa"
#define REMOTE_MAC "aa:aa:aa:aa:aa:bb"

#define LOCAL_IPV4 "172.20.20.170"
#define REMOTE_IPV4 "172.20.20.187"

#define LOCAL_IPV6 "fe80::aa"
#define REMOTE_IPV6 "fe80::bb"

#define IFF_NAPI 0x0010
#define IFF_NAPI_FRAGS 0x0020

static void initialize_tun(void)
{
  tunfd = open("/dev/net/tun", O_RDWR | O_NONBLOCK);
  if (tunfd == -1) {
    printf("tun: can't open /dev/net/tun: please enable CONFIG_TUN=y\n");
    printf("otherwise fuzzing or reproducing might not work as intended\n");
    return;
  }
  const int kTunFd = 252;
  if (dup2(tunfd, kTunFd) < 0)
    fail("dup2(tunfd, kTunFd) failed");
  close(tunfd);
  tunfd = kTunFd;

  struct ifreq ifr;
  memset(&ifr, 0, sizeof(ifr));
  strncpy(ifr.ifr_name, TUN_IFACE, IFNAMSIZ);
  ifr.ifr_flags = IFF_TAP | IFF_NO_PI | IFF_NAPI | IFF_NAPI_FRAGS;
  if (ioctl(tunfd, TUNSETIFF, (void*)&ifr) < 0) {
    ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
    if (ioctl(tunfd, TUNSETIFF, (void*)&ifr) < 0)
      fail("tun: ioctl(TUNSETIFF) failed");
  }
  if (ioctl(tunfd, TUNGETIFF, (void*)&ifr) < 0)
    fail("tun: ioctl(TUNGETIFF) failed");
  tun_frags_enabled = (ifr.ifr_flags & IFF_NAPI_FRAGS) != 0;

  execute_command(1, "sysctl -w net.ipv6.conf.%s.accept_dad=0", TUN_IFACE);

  execute_command(1, "sysctl -w net.ipv6.conf.%s.router_solicitations=0",
                  TUN_IFACE);

  execute_command(1, "ip link set dev %s address %s", TUN_IFACE, LOCAL_MAC);
  execute_command(1, "ip addr add %s/24 dev %s", LOCAL_IPV4, TUN_IFACE);
  execute_command(1, "ip -6 addr add %s/120 dev %s", LOCAL_IPV6, TUN_IFACE);
  execute_command(1, "ip neigh add %s lladdr %s dev %s nud permanent",
                  REMOTE_IPV4, REMOTE_MAC, TUN_IFACE);
  execute_command(1, "ip -6 neigh add %s lladdr %s dev %s nud permanent",
                  REMOTE_IPV6, REMOTE_MAC, TUN_IFACE);
  execute_command(1, "ip link set dev %s up", TUN_IFACE);
}

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

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]);
  }
}

#define MAX_FRAGS 4
struct vnet_fragmentation {
  uint32_t full;
  uint32_t count;
  uint32_t frags[MAX_FRAGS];
};

static uintptr_t syz_emit_ethernet(uintptr_t a0, uintptr_t a1, uintptr_t a2)
{
  if (tunfd < 0)
    return (uintptr_t)-1;

  uint32_t length = a0;
  char* data = (char*)a1;

  struct vnet_fragmentation* frags = (struct vnet_fragmentation*)a2;
  struct iovec vecs[MAX_FRAGS + 1];
  uint32_t nfrags = 0;
  if (!tun_frags_enabled || frags == NULL) {
    vecs[nfrags].iov_base = data;
    vecs[nfrags].iov_len = length;
    nfrags++;
  } else {
    bool full = true;
    uint32_t i, count = 0;
    full = frags->full;
    count = frags->count;
    if (count > MAX_FRAGS)
      count = MAX_FRAGS;
    for (i = 0; i < count && length != 0; i++) {
      uint32_t size = 0;
      size = frags->frags[i];
      if (size > length)
        size = length;
      vecs[nfrags].iov_base = data;
      vecs[nfrags].iov_len = size;
      nfrags++;
      data += size;
      length -= size;
    }
    if (length != 0 && (full || nfrags == 0)) {
      vecs[nfrags].iov_base = data;
      vecs[nfrags].iov_len = length;
      nfrags++;
    }
  }
  return writev(tunfd, vecs, nfrags);
}

static uintptr_t syz_genetlink_get_family_id(uintptr_t name)
{
  char buf[512] = {0};
  struct nlmsghdr* hdr = (struct nlmsghdr*)buf;
  struct genlmsghdr* genlhdr = (struct genlmsghdr*)NLMSG_DATA(hdr);
  struct nlattr* attr = (struct nlattr*)(genlhdr + 1);
  hdr->nlmsg_len =
      sizeof(*hdr) + sizeof(*genlhdr) + sizeof(*attr) + GENL_NAMSIZ;
  hdr->nlmsg_type = GENL_ID_CTRL;
  hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
  genlhdr->cmd = CTRL_CMD_GETFAMILY;
  attr->nla_type = CTRL_ATTR_FAMILY_NAME;
  attr->nla_len = sizeof(*attr) + GENL_NAMSIZ;
  strncpy((char*)(attr + 1), (char*)name, GENL_NAMSIZ);
  struct iovec iov = {hdr, hdr->nlmsg_len};
  struct sockaddr_nl addr = {0};
  addr.nl_family = AF_NETLINK;
  int fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC);
  if (fd == -1) {
    return -1;
  }
  struct msghdr msg = {&addr, sizeof(addr), &iov, 1, NULL, 0, 0};
  if (sendmsg(fd, &msg, 0) == -1) {
    close(fd);
    return -1;
  }
  ssize_t n = recv(fd, buf, sizeof(buf), 0);
  close(fd);
  if (n <= 0) {
    return -1;
  }
  if (hdr->nlmsg_type != GENL_ID_CTRL) {
    return -1;
  }
  for (; (char*)attr < buf + n;
       attr = (struct nlattr*)((char*)attr + NLMSG_ALIGN(attr->nla_len))) {
    if (attr->nla_type == CTRL_ATTR_FAMILY_ID)
      return *(uint16_t*)(attr + 1);
  }
  return -1;
}

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 = 128 << 20;
  setrlimit(RLIMIT_AS, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 8 << 20;
  setrlimit(RLIMIT_MEMLOCK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 32 << 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)) {
  }
}

static int do_sandbox_none(void)
{
  if (unshare(CLONE_NEWPID)) {
  }
  int pid = fork();
  if (pid < 0)
    fail("sandbox fork failed");
  if (pid)
    return pid;

  sandbox_common();
  if (unshare(CLONE_NEWNET)) {
  }
  initialize_tun();
  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;
  *(uint32_t*)0x20aaa000 = 0;
  *(uint32_t*)0x20aaa004 = 0x78;
  *(uint8_t*)0x20aaa008 = 0;
  *(uint8_t*)0x20aaa009 = 0;
  *(uint8_t*)0x20aaa00a = 0;
  *(uint8_t*)0x20aaa00b = 0;
  *(uint32_t*)0x20aaa00c = 0;
  *(uint64_t*)0x20aaa010 = 0;
  *(uint64_t*)0x20aaa018 = 0;
  *(uint64_t*)0x20aaa020 = 0;
  STORE_BY_BITMASK(uint64_t, 0x20aaa028, 0, 0, 1);
  STORE_BY_BITMASK(uint64_t, 0x20aaa028, 0, 1, 1);
  STORE_BY_BITMASK(uint64_t, 0x20aaa028, 0, 2, 1);
  STORE_BY_BITMASK(uint64_t, 0x20aaa028, 0, 3, 1);
  STORE_BY_BITMASK(uint64_t, 0x20aaa028, 0, 4, 1);
  STORE_BY_BITMASK(uint64_t, 0x20aaa028, 0, 5, 1);
  STORE_BY_BITMASK(uint64_t, 0x20aaa028, 0, 6, 1);
  STORE_BY_BITMASK(uint64_t, 0x20aaa028, 0, 7, 1);
  STORE_BY_BITMASK(uint64_t, 0x20aaa028, 0, 8, 1);
  STORE_BY_BITMASK(uint64_t, 0x20aaa028, 0, 9, 1);
  STORE_BY_BITMASK(uint64_t, 0x20aaa028, 0, 10, 1);
  STORE_BY_BITMASK(uint64_t, 0x20aaa028, 0, 11, 1);
  STORE_BY_BITMASK(uint64_t, 0x20aaa028, 0, 12, 1);
  STORE_BY_BITMASK(uint64_t, 0x20aaa028, 0, 13, 1);
  STORE_BY_BITMASK(uint64_t, 0x20aaa028, 0, 14, 1);
  STORE_BY_BITMASK(uint64_t, 0x20aaa028, 0, 15, 2);
  STORE_BY_BITMASK(uint64_t, 0x20aaa028, 0, 17, 1);
  STORE_BY_BITMASK(uint64_t, 0x20aaa028, 0, 18, 1);
  STORE_BY_BITMASK(uint64_t, 0x20aaa028, 0, 19, 1);
  STORE_BY_BITMASK(uint64_t, 0x20aaa028, 0, 20, 1);
  STORE_BY_BITMASK(uint64_t, 0x20aaa028, 0, 21, 1);
  STORE_BY_BITMASK(uint64_t, 0x20aaa028, 0, 22, 1);
  STORE_BY_BITMASK(uint64_t, 0x20aaa028, 0, 23, 1);
  STORE_BY_BITMASK(uint64_t, 0x20aaa028, 0, 24, 1);
  STORE_BY_BITMASK(uint64_t, 0x20aaa028, 0, 25, 1);
  STORE_BY_BITMASK(uint64_t, 0x20aaa028, 0, 26, 1);
  STORE_BY_BITMASK(uint64_t, 0x20aaa028, 0, 27, 1);
  STORE_BY_BITMASK(uint64_t, 0x20aaa028, 0, 28, 1);
  STORE_BY_BITMASK(uint64_t, 0x20aaa028, 0, 29, 35);
  *(uint32_t*)0x20aaa030 = 0;
  *(uint32_t*)0x20aaa034 = 0;
  *(uint64_t*)0x20aaa038 = 0x20000000;
  *(uint64_t*)0x20aaa040 = 0;
  *(uint64_t*)0x20aaa048 = 0;
  *(uint64_t*)0x20aaa050 = 0;
  *(uint32_t*)0x20aaa058 = 0;
  *(uint32_t*)0x20aaa05c = 0;
  *(uint64_t*)0x20aaa060 = 0;
  *(uint32_t*)0x20aaa068 = 0;
  *(uint16_t*)0x20aaa06c = 0;
  *(uint16_t*)0x20aaa06e = 0;
  syscall(__NR_perf_event_open, 0x20aaa000, 0, 0, -1, 0);
  memcpy((void*)0x20000180, "IPVS", 5);
  syz_genetlink_get_family_id(0x20000180);
  res = syscall(__NR_socket, 0xa, 3, 0x2c);
  if (res != -1)
    r[0] = res;
  *(uint16_t*)0x20000000 = 0xa;
  *(uint16_t*)0x20000002 = htobe16(0);
  *(uint32_t*)0x20000004 = 0;
  *(uint8_t*)0x20000008 = 0xfe;
  *(uint8_t*)0x20000009 = 0x80;
  *(uint8_t*)0x2000000a = 0;
  *(uint8_t*)0x2000000b = 0;
  *(uint8_t*)0x2000000c = 0;
  *(uint8_t*)0x2000000d = 0;
  *(uint8_t*)0x2000000e = 0;
  *(uint8_t*)0x2000000f = 0;
  *(uint8_t*)0x20000010 = 0;
  *(uint8_t*)0x20000011 = 0;
  *(uint8_t*)0x20000012 = 0;
  *(uint8_t*)0x20000013 = 0;
  *(uint8_t*)0x20000014 = 0;
  *(uint8_t*)0x20000015 = 0;
  *(uint8_t*)0x20000016 = 0;
  *(uint8_t*)0x20000017 = 0;
  *(uint32_t*)0x20000018 = 9;
  syscall(__NR_connect, r[0], 0x20000000, 0x1c);
  *(uint64_t*)0x20006fc8 = 0;
  *(uint32_t*)0x20006fd0 = 0;
  *(uint64_t*)0x20006fd8 = 0x200013c0;
  *(uint64_t*)0x20006fe0 = 0;
  *(uint64_t*)0x20006fe8 = 0x200005c0;
  *(uint64_t*)0x20006ff0 = 0;
  *(uint32_t*)0x20006ff8 = 0;
  syscall(__NR_sendmsg, r[0], 0x20006fc8, 0xc100);
  *(uint8_t*)0x20000a40 = 0x7f;
  *(uint8_t*)0x20000a41 = 0x45;
  *(uint8_t*)0x20000a42 = 0x4c;
  *(uint8_t*)0x20000a43 = 0x46;
  *(uint8_t*)0x20000a44 = 0;
  *(uint8_t*)0x20000a45 = 0;
  *(uint8_t*)0x20000a46 = 0;
  *(uint8_t*)0x20000a47 = 0;
  *(uint64_t*)0x20000a48 = 0;
  *(uint16_t*)0x20000a50 = 0;
  *(uint16_t*)0x20000a52 = 0;
  *(uint32_t*)0x20000a54 = 0;
  *(uint32_t*)0x20000a58 = 0;
  *(uint32_t*)0x20000a5c = 0x38;
  *(uint32_t*)0x20000a60 = 0;
  *(uint32_t*)0x20000a64 = 0;
  *(uint16_t*)0x20000a68 = 0;
  *(uint16_t*)0x20000a6a = 0x20;
  *(uint16_t*)0x20000a6c = 0;
  *(uint16_t*)0x20000a6e = 0;
  *(uint16_t*)0x20000a70 = 0;
  *(uint16_t*)0x20000a72 = 0;
  *(uint32_t*)0x20000a78 = 0;
  *(uint32_t*)0x20000a7c = 0;
  *(uint32_t*)0x20000a80 = 0;
  *(uint32_t*)0x20000a84 = 0;
  *(uint32_t*)0x20000a88 = 0;
  *(uint32_t*)0x20000a8c = 0;
  *(uint32_t*)0x20000a90 = 0;
  *(uint32_t*)0x20000a94 = 0;
  *(uint64_t*)0x20000a98 = 0;
  *(uint64_t*)0x20000aa0 = 0;
  *(uint64_t*)0x20000aa8 = 0;
  *(uint64_t*)0x20000ab0 = 0;
  *(uint64_t*)0x20000ab8 = 0;
  *(uint64_t*)0x20000ac0 = 0;
  *(uint64_t*)0x20000ac8 = 0;
  *(uint64_t*)0x20000ad0 = 0;
  *(uint64_t*)0x20000ad8 = 0;
  *(uint64_t*)0x20000ae0 = 0;
  *(uint64_t*)0x20000ae8 = 0;
  *(uint64_t*)0x20000af0 = 0;
  *(uint64_t*)0x20000af8 = 0;
  *(uint64_t*)0x20000b00 = 0;
  *(uint64_t*)0x20000b08 = 0;
  *(uint64_t*)0x20000b10 = 0;
  *(uint64_t*)0x20000b18 = 0;
  *(uint64_t*)0x20000b20 = 0;
  *(uint64_t*)0x20000b28 = 0;
  *(uint64_t*)0x20000b30 = 0;
  *(uint64_t*)0x20000b38 = 0;
  *(uint64_t*)0x20000b40 = 0;
  *(uint64_t*)0x20000b48 = 0;
  *(uint64_t*)0x20000b50 = 0;
  *(uint64_t*)0x20000b58 = 0;
  *(uint64_t*)0x20000b60 = 0;
  *(uint64_t*)0x20000b68 = 0;
  *(uint64_t*)0x20000b70 = 0;
  *(uint64_t*)0x20000b78 = 0;
  *(uint64_t*)0x20000b80 = 0;
  *(uint64_t*)0x20000b88 = 0;
  *(uint64_t*)0x20000b90 = 0;
  *(uint64_t*)0x20000b98 = 0;
  *(uint64_t*)0x20000ba0 = 0;
  *(uint64_t*)0x20000ba8 = 0;
  *(uint64_t*)0x20000bb0 = 0;
  *(uint64_t*)0x20000bb8 = 0;
  *(uint64_t*)0x20000bc0 = 0;
  *(uint64_t*)0x20000bc8 = 0;
  *(uint64_t*)0x20000bd0 = 0;
  *(uint64_t*)0x20000bd8 = 0;
  *(uint64_t*)0x20000be0 = 0;
  *(uint64_t*)0x20000be8 = 0;
  *(uint64_t*)0x20000bf0 = 0;
  *(uint64_t*)0x20000bf8 = 0;
  *(uint64_t*)0x20000c00 = 0;
  *(uint64_t*)0x20000c08 = 0;
  *(uint64_t*)0x20000c10 = 0;
  *(uint64_t*)0x20000c18 = 0;
  *(uint64_t*)0x20000c20 = 0;
  *(uint64_t*)0x20000c28 = 0;
  *(uint64_t*)0x20000c30 = 0;
  *(uint64_t*)0x20000c38 = 0;
  *(uint64_t*)0x20000c40 = 0;
  *(uint64_t*)0x20000c48 = 0;
  *(uint64_t*)0x20000c50 = 0;
  *(uint64_t*)0x20000c58 = 0;
  *(uint64_t*)0x20000c60 = 0;
  *(uint64_t*)0x20000c68 = 0;
  *(uint64_t*)0x20000c70 = 0;
  *(uint64_t*)0x20000c78 = 0;
  *(uint64_t*)0x20000c80 = 0;
  *(uint64_t*)0x20000c88 = 0;
  *(uint64_t*)0x20000c90 = 0;
  *(uint64_t*)0x20000c98 = 0;
  *(uint64_t*)0x20000ca0 = 0;
  *(uint64_t*)0x20000ca8 = 0;
  *(uint64_t*)0x20000cb0 = 0;
  *(uint64_t*)0x20000cb8 = 0;
  *(uint64_t*)0x20000cc0 = 0;
  *(uint64_t*)0x20000cc8 = 0;
  *(uint64_t*)0x20000cd0 = 0;
  *(uint64_t*)0x20000cd8 = 0;
  *(uint64_t*)0x20000ce0 = 0;
  *(uint64_t*)0x20000ce8 = 0;
  *(uint64_t*)0x20000cf0 = 0;
  *(uint64_t*)0x20000cf8 = 0;
  *(uint64_t*)0x20000d00 = 0;
  *(uint64_t*)0x20000d08 = 0;
  *(uint64_t*)0x20000d10 = 0;
  *(uint64_t*)0x20000d18 = 0;
  *(uint64_t*)0x20000d20 = 0;
  *(uint64_t*)0x20000d28 = 0;
  *(uint64_t*)0x20000d30 = 0;
  *(uint64_t*)0x20000d38 = 0;
  *(uint64_t*)0x20000d40 = 0;
  *(uint64_t*)0x20000d48 = 0;
  *(uint64_t*)0x20000d50 = 0;
  *(uint64_t*)0x20000d58 = 0;
  *(uint64_t*)0x20000d60 = 0;
  *(uint64_t*)0x20000d68 = 0;
  *(uint64_t*)0x20000d70 = 0;
  *(uint64_t*)0x20000d78 = 0;
  *(uint64_t*)0x20000d80 = 0;
  *(uint64_t*)0x20000d88 = 0;
  *(uint64_t*)0x20000d90 = 0;
  *(uint64_t*)0x20000d98 = 0;
  *(uint64_t*)0x20000da0 = 0;
  *(uint64_t*)0x20000da8 = 0;
  *(uint64_t*)0x20000db0 = 0;
  *(uint64_t*)0x20000db8 = 0;
  *(uint64_t*)0x20000dc0 = 0;
  *(uint64_t*)0x20000dc8 = 0;
  *(uint64_t*)0x20000dd0 = 0;
  *(uint64_t*)0x20000dd8 = 0;
  *(uint64_t*)0x20000de0 = 0;
  *(uint64_t*)0x20000de8 = 0;
  *(uint64_t*)0x20000df0 = 0;
  *(uint64_t*)0x20000df8 = 0;
  *(uint64_t*)0x20000e00 = 0;
  *(uint64_t*)0x20000e08 = 0;
  *(uint64_t*)0x20000e10 = 0;
  *(uint64_t*)0x20000e18 = 0;
  *(uint64_t*)0x20000e20 = 0;
  *(uint64_t*)0x20000e28 = 0;
  *(uint64_t*)0x20000e30 = 0;
  *(uint64_t*)0x20000e38 = 0;
  *(uint64_t*)0x20000e40 = 0;
  *(uint64_t*)0x20000e48 = 0;
  *(uint64_t*)0x20000e50 = 0;
  *(uint64_t*)0x20000e58 = 0;
  *(uint64_t*)0x20000e60 = 0;
  *(uint64_t*)0x20000e68 = 0;
  *(uint64_t*)0x20000e70 = 0;
  *(uint64_t*)0x20000e78 = 0;
  *(uint64_t*)0x20000e80 = 0;
  *(uint64_t*)0x20000e88 = 0;
  *(uint64_t*)0x20000e90 = 0;
  syscall(__NR_write, r[0], 0x20000a40, 0x458);
  memcpy((void*)0x20000000, "\xcd\xf2\x76\x00\x08\x05", 6);
  *(uint8_t*)0x20000006 = 1;
  *(uint8_t*)0x20000007 = 0x80;
  *(uint8_t*)0x20000008 = 0xc2;
  *(uint8_t*)0x20000009 = 0;
  *(uint8_t*)0x2000000a = 0;
  *(uint8_t*)0x2000000b = 0;
  *(uint16_t*)0x2000000c = htobe16(0x86dd);
  STORE_BY_BITMASK(uint8_t, 0x2000000e, 0, 0, 4);
  STORE_BY_BITMASK(uint8_t, 0x2000000e, 6, 4, 4);
  memcpy((void*)0x2000000f, "\x11\x0c\x11", 3);
  *(uint16_t*)0x20000012 = htobe16(0x30);
  *(uint8_t*)0x20000014 = 0x3a;
  *(uint8_t*)0x20000015 = 0;
  *(uint8_t*)0x20000016 = 0xfe;
  *(uint8_t*)0x20000017 = 0x80;
  *(uint8_t*)0x20000018 = 0;
  *(uint8_t*)0x20000019 = 0;
  *(uint8_t*)0x2000001a = 0;
  *(uint8_t*)0x2000001b = 0;
  *(uint8_t*)0x2000001c = 0;
  *(uint8_t*)0x2000001d = 0;
  *(uint8_t*)0x2000001e = 0;
  *(uint8_t*)0x2000001f = 0;
  *(uint8_t*)0x20000020 = 0;
  *(uint8_t*)0x20000021 = 0;
  *(uint8_t*)0x20000022 = 0;
  *(uint8_t*)0x20000023 = 0;
  *(uint8_t*)0x20000024 = 0;
  *(uint8_t*)0x20000025 = -1;
  *(uint8_t*)0x20000026 = -1;
  *(uint8_t*)0x20000027 = 2;
  *(uint8_t*)0x20000028 = 0;
  *(uint8_t*)0x20000029 = 0;
  *(uint8_t*)0x2000002a = 0;
  *(uint8_t*)0x2000002b = 0;
  *(uint8_t*)0x2000002c = 0;
  *(uint8_t*)0x2000002d = 0;
  *(uint8_t*)0x2000002e = 0;
  *(uint8_t*)0x2000002f = 0;
  *(uint8_t*)0x20000030 = 0;
  *(uint8_t*)0x20000031 = 0;
  *(uint8_t*)0x20000032 = 0;
  *(uint8_t*)0x20000033 = 0;
  *(uint8_t*)0x20000034 = 0;
  *(uint8_t*)0x20000035 = 1;
  *(uint8_t*)0x20000036 = 2;
  *(uint8_t*)0x20000037 = 0;
  *(uint16_t*)0x20000038 = 0;
  *(uint8_t*)0x2000003a = 0;
  *(uint8_t*)0x2000003b = 0;
  *(uint8_t*)0x2000003c = 0;
  *(uint8_t*)0x2000003d = 0;
  STORE_BY_BITMASK(uint8_t, 0x2000003e, 0, 0, 4);
  STORE_BY_BITMASK(uint8_t, 0x2000003e, 6, 4, 4);
  memcpy((void*)0x2000003f, "\xcb\x15\x5d", 3);
  *(uint16_t*)0x20000042 = htobe16(0);
  *(uint8_t*)0x20000044 = 0x2f;
  *(uint8_t*)0x20000045 = 0;
  *(uint8_t*)0x20000046 = -1;
  *(uint8_t*)0x20000047 = 2;
  *(uint8_t*)0x20000048 = 0;
  *(uint8_t*)0x20000049 = 0;
  *(uint8_t*)0x2000004a = 0;
  *(uint8_t*)0x2000004b = 0;
  *(uint8_t*)0x2000004c = 0;
  *(uint8_t*)0x2000004d = 0;
  *(uint8_t*)0x2000004e = 0;
  *(uint8_t*)0x2000004f = 0;
  *(uint8_t*)0x20000050 = 0;
  *(uint8_t*)0x20000051 = 0;
  *(uint8_t*)0x20000052 = 0;
  *(uint8_t*)0x20000053 = 0;
  *(uint8_t*)0x20000054 = 0;
  *(uint8_t*)0x20000055 = 1;
  *(uint8_t*)0x20000056 = 0xfe;
  *(uint8_t*)0x20000057 = 0x80;
  *(uint8_t*)0x20000058 = 0;
  *(uint8_t*)0x20000059 = 0;
  *(uint8_t*)0x2000005a = 0;
  *(uint8_t*)0x2000005b = 0;
  *(uint8_t*)0x2000005c = 0;
  *(uint8_t*)0x2000005d = 0;
  *(uint8_t*)0x2000005e = 0;
  *(uint8_t*)0x2000005f = 0;
  *(uint8_t*)0x20000060 = 0;
  *(uint8_t*)0x20000061 = 0;
  *(uint8_t*)0x20000062 = 0;
  *(uint8_t*)0x20000063 = 0;
  *(uint8_t*)0x20000064 = 0;
  *(uint8_t*)0x20000065 = 0;
  struct csum_inet csum_1;
  csum_inet_init(&csum_1);
  csum_inet_update(&csum_1, (const uint8_t*)0x20000016, 16);
  csum_inet_update(&csum_1, (const uint8_t*)0x20000026, 16);
  uint32_t csum_1_chunk_2 = 0x30000000;
  csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_2, 4);
  uint32_t csum_1_chunk_3 = 0x3a000000;
  csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_3, 4);
  csum_inet_update(&csum_1, (const uint8_t*)0x20000036, 48);
  *(uint16_t*)0x20000038 = csum_inet_digest(&csum_1);
  syz_emit_ethernet(0x66, 0x20000000, 0);
}

int main()
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  for (;;) {
    int pid = do_sandbox_none();
    int status = 0;
    while (waitpid(pid, &status, __WALL) != pid) {
    }
  }
}