// https://syzkaller.appspot.com/bug?id=4e947674d10b0fb0cb94d4d723989cee439a71d6
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <errno.h>
#include <linux/net.h>
#include <netinet/in.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <sys/prctl.h>
#include <sys/socket.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

__attribute__((noreturn)) static void doexit(int status)
{
  volatile unsigned i;
  syscall(__NR_exit_group, status);
  for (i = 0;; i++) {
  }
}
#include <stdint.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 uint64_t current_time_ms()
{
  struct timespec ts;

  if (clock_gettime(CLOCK_MONOTONIC, &ts))
    fail("clock_gettime failed");
  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

struct ipt_getinfo {
  char name[32];
  unsigned int valid_hooks;
  unsigned int hook_entry[5];
  unsigned int underflow[5];
  unsigned int num_entries;
  unsigned int size;
};

struct ipt_get_entries {
  char name[32];
  unsigned int size;
  void* entrytable[1024 / sizeof(void*)];
};

struct xt_counters {
  uint64_t pcnt, bcnt;
};

struct ipt_replace {
  char name[32];
  unsigned int valid_hooks;
  unsigned int num_entries;
  unsigned int size;
  unsigned int hook_entry[5];
  unsigned int underflow[5];
  unsigned int num_counters;
  struct xt_counters* counters;
  char entrytable[1024];
};

struct ipt_table_desc {
  const char* name;
  struct ipt_getinfo info;
  struct ipt_get_entries entries;
  struct ipt_replace replace;
  struct xt_counters counters[10];
};

static struct ipt_table_desc ipv4_tables[] = {
    {.name = "filter"}, {.name = "nat"},      {.name = "mangle"},
    {.name = "raw"},    {.name = "security"},
};

#define IPT_BASE_CTL 64
#define IPT_SO_SET_REPLACE (IPT_BASE_CTL)
#define IPT_SO_GET_INFO (IPT_BASE_CTL)
#define IPT_SO_GET_ENTRIES (IPT_BASE_CTL + 1)

static void checkpoint_net_namespace(void)
{
  socklen_t optlen;
  unsigned i;
  int fd;

  fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
  if (fd == -1)
    fail("socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)");
  for (i = 0; i < sizeof(ipv4_tables) / sizeof(ipv4_tables[0]); i++) {
    struct ipt_table_desc* table = &ipv4_tables[i];
    strcpy(table->info.name, table->name);
    strcpy(table->entries.name, table->name);
    strcpy(table->replace.name, table->name);
    optlen = sizeof(table->info);
    if (getsockopt(fd, SOL_IP, IPT_SO_GET_INFO, &table->info, &optlen)) {
      switch (errno) {
      case EPERM:
      case ENOENT:
      case ENOPROTOOPT:
        continue;
      }
      fail("getsockopt(IPT_SO_GET_INFO)");
    }
    if (table->info.size > sizeof(table->entries.entrytable))
      fail("table size is too large: %u", table->info.size);
    if (table->info.num_entries >
        sizeof(table->counters) / sizeof(table->counters[0]))
      fail("too many counters: %u", table->info.num_entries);
    table->entries.size = table->info.size;
    optlen = sizeof(table->entries) - sizeof(table->entries.entrytable) +
             table->info.size;
    if (getsockopt(fd, SOL_IP, IPT_SO_GET_ENTRIES, &table->entries, &optlen))
      fail("getsockopt(IPT_SO_GET_ENTRIES)");
    table->replace.valid_hooks = table->info.valid_hooks;
    table->replace.num_entries = table->info.num_entries;
    table->replace.counters = table->counters;
    table->replace.size = table->info.size;
    memcpy(table->replace.hook_entry, table->info.hook_entry,
           sizeof(table->replace.hook_entry));
    memcpy(table->replace.underflow, table->info.underflow,
           sizeof(table->replace.underflow));
    memcpy(table->replace.entrytable, table->entries.entrytable,
           table->info.size);
  }
  close(fd);
}

static void reset_net_namespace(void)
{
  struct ipt_get_entries entries;
  struct ipt_getinfo info;
  socklen_t optlen;
  unsigned i;
  int fd;

  memset(&info, 0, sizeof(info));
  memset(&entries, 0, sizeof(entries));
  fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
  if (fd == -1)
    fail("socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)");
  for (i = 0; i < sizeof(ipv4_tables) / sizeof(ipv4_tables[0]); i++) {
    struct ipt_table_desc* table = &ipv4_tables[i];
    if (table->info.valid_hooks == 0)
      continue;
    strcpy(info.name, table->name);
    optlen = sizeof(info);
    if (getsockopt(fd, SOL_IP, IPT_SO_GET_INFO, &info, &optlen))
      fail("getsockopt(IPT_SO_GET_INFO)");
    if (memcmp(&table->info, &info, sizeof(table->info)) == 0) {
      strcpy(entries.name, table->name);
      entries.size = table->info.size;
      optlen = sizeof(entries) - sizeof(entries.entrytable) + entries.size;
      if (getsockopt(fd, SOL_IP, IPT_SO_GET_ENTRIES, &entries, &optlen))
        fail("getsockopt(IPT_SO_GET_ENTRIES)");
      if (memcmp(&table->entries, &entries, optlen) == 0)
        continue;
    }
    table->replace.num_counters = info.num_entries;
    optlen = sizeof(table->replace) - sizeof(table->replace.entrytable) +
             table->replace.size;
    if (setsockopt(fd, SOL_IP, IPT_SO_SET_REPLACE, &table->replace, optlen))
      fail("setsockopt(IPT_SO_SET_REPLACE)");
  }
  close(fd);
}

static void test();

void loop()
{
  int iter;
  checkpoint_net_namespace();
  for (iter = 0;; iter++) {
    int pid = fork();
    if (pid < 0)
      fail("loop fork failed");
    if (pid == 0) {
      prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
      setpgrp();
      test();
      doexit(0);
    }
    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      int res = waitpid(-1, &status, __WALL | WNOHANG);
      if (res == pid)
        break;
      usleep(1000);
      if (current_time_ms() - start > 5 * 1000) {
        kill(-pid, SIGKILL);
        kill(pid, SIGKILL);
        while (waitpid(-1, &status, __WALL) != pid) {
        }
        break;
      }
    }
    reset_net_namespace();
  }
}

#ifndef __NR_sendto
#define __NR_sendto 369
#endif
#ifndef __NR_sendmsg
#define __NR_sendmsg 370
#endif
#ifndef __NR_mmap
#define __NR_mmap 192
#endif
#ifndef __NR_socket
#define __NR_socket 359
#endif
#ifndef __NR_bind
#define __NR_bind 361
#endif
#undef __NR_mmap
#define __NR_mmap __NR_mmap2

long r[2];
void test()
{
  memset(r, -1, sizeof(r));
  syscall(__NR_mmap, 0x20000000, 0xfff000, 3, 0x32, -1, 0);
  r[0] = syscall(__NR_socket, 2, 2, 0x88);
  *(uint16_t*)0x20b9aff0 = 2;
  *(uint16_t*)0x20b9aff2 = htobe16(0x4e20);
  *(uint32_t*)0x20b9aff4 = htobe32(0);
  *(uint8_t*)0x20b9aff8 = 0;
  *(uint8_t*)0x20b9aff9 = 0;
  *(uint8_t*)0x20b9affa = 0;
  *(uint8_t*)0x20b9affb = 0;
  *(uint8_t*)0x20b9affc = 0;
  *(uint8_t*)0x20b9affd = 0;
  *(uint8_t*)0x20b9affe = 0;
  *(uint8_t*)0x20b9afff = 0;
  syscall(__NR_bind, r[0], 0x20b9aff0, 0x10);
  *(uint16_t*)0x20319ff0 = 2;
  *(uint16_t*)0x20319ff2 = htobe16(0x4e20);
  *(uint32_t*)0x20319ff4 = htobe32(0);
  *(uint8_t*)0x20319ff8 = 0;
  *(uint8_t*)0x20319ff9 = 0;
  *(uint8_t*)0x20319ffa = 0;
  *(uint8_t*)0x20319ffb = 0;
  *(uint8_t*)0x20319ffc = 0;
  *(uint8_t*)0x20319ffd = 0;
  *(uint8_t*)0x20319ffe = 0;
  *(uint8_t*)0x20319fff = 0;
  syscall(__NR_sendto, r[0], 0x20e7c000, 0, 0x8084, 0x20319ff0, 0x10);
  *(uint16_t*)0x2082dff0 = 2;
  *(uint16_t*)0x2082dff2 = 0;
  *(uint8_t*)0x2082dff4 = 0xac;
  *(uint8_t*)0x2082dff5 = 0x14;
  *(uint8_t*)0x2082dff6 = 0;
  *(uint8_t*)0x2082dff7 = 0xaa;
  *(uint8_t*)0x2082dff8 = 0;
  *(uint8_t*)0x2082dff9 = 0;
  *(uint8_t*)0x2082dffa = 0;
  *(uint8_t*)0x2082dffb = 0;
  *(uint8_t*)0x2082dffc = 0;
  *(uint8_t*)0x2082dffd = 0;
  *(uint8_t*)0x2082dffe = 0;
  *(uint8_t*)0x2082dfff = 0;
  syscall(__NR_sendto, r[0], 0x20f79fff, 0, 0, 0x2082dff0, 0x10);
  r[1] = syscall(__NR_socket, 0xf, 3, 2);
  *(uint32_t*)0x20cd0fc8 = 0;
  *(uint32_t*)0x20cd0fcc = 0;
  *(uint32_t*)0x20cd0fd0 = 0x20858ff0;
  *(uint32_t*)0x20cd0fd4 = 1;
  *(uint32_t*)0x20cd0fd8 = 0;
  *(uint32_t*)0x20cd0fdc = 0;
  *(uint32_t*)0x20cd0fe0 = 0;
  *(uint32_t*)0x20858ff0 = 0x20e05000;
  *(uint32_t*)0x20858ff4 = 0xc0;
  *(uint8_t*)0x20e05000 = 2;
  *(uint8_t*)0x20e05001 = 0xd;
  *(uint8_t*)0x20e05002 = 0;
  *(uint8_t*)0x20e05003 = 0;
  *(uint16_t*)0x20e05004 = 0x18;
  *(uint16_t*)0x20e05006 = 0;
  *(uint32_t*)0x20e05008 = 0;
  *(uint32_t*)0x20e0500c = 0;
  *(uint16_t*)0x20e05010 = 4;
  *(uint16_t*)0x20e05012 = 3;
  *(uint32_t*)0x20e05014 = 4;
  *(uint64_t*)0x20e05018 = 0;
  *(uint64_t*)0x20e05020 = 0;
  *(uint64_t*)0x20e05028 = 0;
  *(uint16_t*)0x20e05030 = 8;
  *(uint16_t*)0x20e05032 = 0x12;
  *(uint16_t*)0x20e05034 = 0;
  *(uint8_t*)0x20e05036 = 1;
  *(uint8_t*)0x20e05037 = 0;
  *(uint32_t*)0x20e05038 = 0;
  *(uint32_t*)0x20e0503c = 0;
  *(uint16_t*)0x20e05040 = 6;
  *(uint16_t*)0x20e05042 = 0;
  *(uint8_t*)0x20e05044 = 0;
  *(uint8_t*)0x20e05045 = 0;
  *(uint16_t*)0x20e05046 = 0;
  *(uint32_t*)0x20e05048 = 0;
  *(uint32_t*)0x20e0504c = 0;
  *(uint8_t*)0x20e05050 = 0xac;
  *(uint8_t*)0x20e05051 = 0x14;
  *(uint8_t*)0x20e05052 = 0;
  *(uint8_t*)0x20e05053 = 0xaa;
  *(uint8_t*)0x20e05060 = -1;
  *(uint8_t*)0x20e05061 = 2;
  *(uint8_t*)0x20e05062 = 0;
  *(uint8_t*)0x20e05063 = 0;
  *(uint8_t*)0x20e05064 = 0;
  *(uint8_t*)0x20e05065 = 0;
  *(uint8_t*)0x20e05066 = 0;
  *(uint8_t*)0x20e05067 = 0;
  *(uint8_t*)0x20e05068 = 0;
  *(uint8_t*)0x20e05069 = 0;
  *(uint8_t*)0x20e0506a = 0;
  *(uint8_t*)0x20e0506b = 0;
  *(uint8_t*)0x20e0506c = 0;
  *(uint8_t*)0x20e0506d = 0;
  *(uint8_t*)0x20e0506e = 0;
  *(uint8_t*)0x20e0506f = 1;
  *(uint16_t*)0x20e05070 = 5;
  *(uint16_t*)0x20e05072 = 5;
  *(uint8_t*)0x20e05074 = 0;
  *(uint8_t*)0x20e05075 = 0;
  *(uint16_t*)0x20e05076 = 0;
  *(uint16_t*)0x20e05078 = 0xa;
  *(uint16_t*)0x20e0507a = 0;
  *(uint32_t*)0x20e0507c = 0;
  *(uint8_t*)0x20e05080 = 0;
  *(uint8_t*)0x20e05081 = 0;
  *(uint8_t*)0x20e05082 = 0;
  *(uint8_t*)0x20e05083 = 0;
  *(uint8_t*)0x20e05084 = 0;
  *(uint8_t*)0x20e05085 = 0;
  *(uint8_t*)0x20e05086 = 0;
  *(uint8_t*)0x20e05087 = 0;
  *(uint8_t*)0x20e05088 = 0;
  *(uint8_t*)0x20e05089 = 0;
  *(uint8_t*)0x20e0508a = -1;
  *(uint8_t*)0x20e0508b = -1;
  *(uint8_t*)0x20e0508c = 0xac;
  *(uint8_t*)0x20e0508d = 0x14;
  *(uint8_t*)0x20e0508e = 0;
  *(uint8_t*)0x20e0508f = 0;
  *(uint32_t*)0x20e05090 = 0;
  *(uint16_t*)0x20e05098 = 5;
  *(uint16_t*)0x20e0509a = 6;
  *(uint8_t*)0x20e0509c = 0;
  *(uint8_t*)0x20e0509d = 0;
  *(uint16_t*)0x20e0509e = 0;
  *(uint16_t*)0x20e050a0 = 0xa;
  *(uint16_t*)0x20e050a2 = 0;
  *(uint32_t*)0x20e050a4 = 0;
  *(uint8_t*)0x20e050a8 = 0xfe;
  *(uint8_t*)0x20e050a9 = 0x80;
  *(uint8_t*)0x20e050aa = 0;
  *(uint8_t*)0x20e050ab = 0;
  *(uint8_t*)0x20e050ac = 0;
  *(uint8_t*)0x20e050ad = 0;
  *(uint8_t*)0x20e050ae = 0;
  *(uint8_t*)0x20e050af = 0;
  *(uint8_t*)0x20e050b0 = 0;
  *(uint8_t*)0x20e050b1 = 0;
  *(uint8_t*)0x20e050b2 = 0;
  *(uint8_t*)0x20e050b3 = 0;
  *(uint8_t*)0x20e050b4 = 0;
  *(uint8_t*)0x20e050b5 = 0;
  *(uint8_t*)0x20e050b6 = 0;
  *(uint8_t*)0x20e050b7 = 0xbb;
  *(uint32_t*)0x20e050b8 = 0;
  syscall(__NR_sendmsg, r[1], 0x20cd0fc8, 0);
  *(uint8_t*)0x2065afa5 = 0xaa;
  *(uint8_t*)0x2065afa6 = 0xaa;
  *(uint8_t*)0x2065afa7 = 0xaa;
  *(uint8_t*)0x2065afa8 = 0xaa;
  *(uint8_t*)0x2065afa9 = 0;
  *(uint8_t*)0x2065afaa = 0xaa;
  *(uint8_t*)0x2065afab = 0xaa;
  *(uint8_t*)0x2065afac = 0xaa;
  *(uint8_t*)0x2065afad = 0xaa;
  *(uint8_t*)0x2065afae = 0xaa;
  *(uint8_t*)0x2065afaf = 0;
  *(uint8_t*)0x2065afb0 = 0;
  *(uint16_t*)0x2065afb1 = htobe16(0x800);
  STORE_BY_BITMASK(uint8_t, 0x2065afb3, 7, 0, 4);
  STORE_BY_BITMASK(uint8_t, 0x2065afb3, 4, 4, 4);
  STORE_BY_BITMASK(uint8_t, 0x2065afb4, 0, 0, 2);
  STORE_BY_BITMASK(uint8_t, 0x2065afb4, 0, 2, 6);
  *(uint16_t*)0x2065afb5 = htobe16(0x38);
  *(uint16_t*)0x2065afb7 = 0;
  *(uint16_t*)0x2065afb9 = htobe16(0);
  *(uint8_t*)0x2065afbb = 0;
  *(uint8_t*)0x2065afbc = 0;
  *(uint16_t*)0x2065afbd = 0;
  *(uint8_t*)0x2065afbf = 0xac;
  *(uint8_t*)0x2065afc0 = 0x14;
  *(uint8_t*)0x2065afc1 = 0;
  *(uint8_t*)0x2065afc2 = 0;
  *(uint8_t*)0x2065afc3 = 0xac;
  *(uint8_t*)0x2065afc4 = 0x14;
  *(uint8_t*)0x2065afc5 = 0;
  *(uint8_t*)0x2065afc6 = 0xaa;
  *(uint8_t*)0x2065afc7 = 0x44;
  *(uint8_t*)0x2065afc8 = 8;
  *(uint8_t*)0x2065afc9 = 5;
  STORE_BY_BITMASK(uint8_t, 0x2065afca, 0, 0, 4);
  STORE_BY_BITMASK(uint8_t, 0x2065afca, 0, 4, 4);
  *(uint32_t*)0x2065afcb = htobe32(0);
  *(uint8_t*)0x2065afcf = 3;
  *(uint8_t*)0x2065afd0 = 0;
  *(uint16_t*)0x2065afd1 = 0;
  *(uint8_t*)0x2065afd3 = 0;
  *(uint8_t*)0x2065afd4 = 0;
  *(uint16_t*)0x2065afd5 = htobe16(0);
  STORE_BY_BITMASK(uint8_t, 0x2065afd7, 5, 0, 4);
  STORE_BY_BITMASK(uint8_t, 0x2065afd7, 4, 4, 4);
  STORE_BY_BITMASK(uint8_t, 0x2065afd8, 0, 0, 2);
  STORE_BY_BITMASK(uint8_t, 0x2065afd8, 0, 2, 6);
  *(uint16_t*)0x2065afd9 = htobe16(0);
  *(uint16_t*)0x2065afdb = 0;
  *(uint16_t*)0x2065afdd = htobe16(0);
  *(uint8_t*)0x2065afdf = 0;
  *(uint8_t*)0x2065afe0 = 0;
  *(uint16_t*)0x2065afe1 = htobe16(0);
  *(uint32_t*)0x2065afe3 = htobe32(-1);
  *(uint32_t*)0x2065afe7 = htobe32(0xe0000001);
  *(uint32_t*)0x203b5000 = 0;
  *(uint32_t*)0x203b5004 = 0;
  struct csum_inet csum_1;
  csum_inet_init(&csum_1);
  csum_inet_update(&csum_1, (const uint8_t*)0x2065afcf, 28);
  *(uint16_t*)0x2065afd1 = csum_inet_digest(&csum_1);
  struct csum_inet csum_2;
  csum_inet_init(&csum_2);
  csum_inet_update(&csum_2, (const uint8_t*)0x2065afb3, 28);
  *(uint16_t*)0x2065afbd = csum_inet_digest(&csum_2);
}

int main()
{
  for (;;) {
    loop();
  }
}