// https://syzkaller.appspot.com/bug?id=bea1c185923957c5339d5b43bca13e71047453da
// 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 <setjmp.h>
#include <signal.h>
#include <stdint.h>
#include <string.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 __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* uctx)
{
  uintptr_t addr = (uintptr_t)info->si_addr;
  const uintptr_t prog_start = 1 << 20;
  const uintptr_t prog_end = 100 << 20;
  if (__atomic_load_n(&skip_segv, __ATOMIC_RELAXED) &&
      (addr < prog_start || addr > prog_end)) {
    _longjmp(segv_env, 1);
  }
  doexit(sig);
}

static void install_segv_handler()
{
  struct sigaction sa;

  memset(&sa, 0, sizeof(sa));
  sa.sa_handler = SIG_IGN;
  syscall(SYS_rt_sigaction, 0x20, &sa, NULL, 8);
  syscall(SYS_rt_sigaction, 0x21, &sa, NULL, 8);

  memset(&sa, 0, sizeof(sa));
  sa.sa_sigaction = segv_handler;
  sa.sa_flags = SA_NODEFER | SA_SIGINFO;
  sigaction(SIGSEGV, &sa, NULL);
  sigaction(SIGBUS, &sa, NULL);
}

#define NONFAILING(...)                                                        \
  {                                                                            \
    __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    if (_setjmp(segv_env) == 0) {                                              \
      __VA_ARGS__;                                                             \
    }                                                                          \
    __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
  }

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();
  }
}

long r[3];
uint64_t procid;
void test()
{
  memset(r, -1, sizeof(r));
  syscall(__NR_mmap, 0x20000000, 0xfff000, 3, 0x32, -1, 0);
  r[0] = syscall(__NR_socket, 0x26, 5, 0);
  syscall(__NR_close, r[0]);
  r[1] = syscall(__NR_socket, 0x26, 5, 0);
  NONFAILING(*(uint16_t*)0x20219fa8 = 0x26);
  NONFAILING(memcpy((void*)0x20219faa,
                    "\x73\x6b\x63\x69\x70\x68\x65\x72\x00\x00\x00\x00\x00\x00",
                    14));
  NONFAILING(*(uint32_t*)0x20219fb8 = 0);
  NONFAILING(*(uint32_t*)0x20219fbc = 0);
  NONFAILING(memcpy((void*)0x20219fc0,
                    "\x73\x61\x6c\x73\x61\x32\x30\x00\x00\x00\x00\x00\x00\x00"
                    "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                    "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                    "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                    "\x00\x00\x00\x00\x00\x00\x00\x00",
                    64));
  syscall(__NR_bind, r[0], 0x20219fa8, 0x58);
  NONFAILING(memcpy(
      (void*)0x20001f3a,
      "\xad\x56\xb6\xc5\x82\x0f\xae\xb9\x95\x29\x89\x92\xea\x54\xc7\xbe", 16));
  syscall(__NR_setsockopt, r[1], 0x117, 1, 0x20001f3a, 0x10);
  r[2] = syscall(__NR_accept, r[1], 0, 0);
  NONFAILING(*(uint64_t*)0x20791000 = 0);
  NONFAILING(*(uint32_t*)0x20791008 = 0);
  NONFAILING(*(uint64_t*)0x20791010 = 0x20cf6000);
  NONFAILING(*(uint64_t*)0x20791018 = 1);
  NONFAILING(*(uint64_t*)0x20791020 = 0x20000000);
  NONFAILING(*(uint64_t*)0x20791028 = 0);
  NONFAILING(*(uint32_t*)0x20791030 = 0);
  NONFAILING(*(uint64_t*)0x20cf6000 = 0x20087000);
  NONFAILING(*(uint64_t*)0x20cf6008 = 0x80);
  NONFAILING(
      memcpy((void*)0x20087000,
             "\x51\xc8\xfb\x29\x29\x98\x9d\x20\xaf\xe7\x3d\xca\xc1\x12\x91\xb7"
             "\x20\xbd\x7b\x71\xdd\xeb\x91\x61\x96\x6d\x49\x86\xbc\x69\x33\x5f"
             "\xf6\x3b\x71\x1f\x36\x65\x3d\x33\xc3\xaf\x96\xb4\x27\x39\x38\x69"
             "\x50\x91\x95\xdb\xe3\xbb\xd7\x2d\x89\x61\x05\xf0\x20\x41\x6b\xbc"
             "\xa5\xf9\xc9\x6a\x03\x1e\xde\x84\xd7\x22\xa8\xca\x57\x49\x65\xa5"
             "\x35\x85\x02\x15\x33\x5d\x66\xef\xc5\xe1\x24\xd0\x25\xa7\x62\xf7"
             "\x7b\x51\xe2\xad\x1a\xe8\x86\x5d\xa4\xed\x5d\xde\x15\xbe\x35\xbe"
             "\x78\xfc\xdb\x66\x7a\x12\xe2\x45\x2c\x8b\x20\x14\x61\xf9\x62\xad",
             128));
  syscall(__NR_sendmmsg, r[2], 0x20791000, 1, 0);
  NONFAILING(*(uint64_t*)0x20b2f000 = 0x208e8000);
  NONFAILING(*(uint32_t*)0x20b2f008 = 0x10);
  NONFAILING(*(uint64_t*)0x20b2f010 = 0x204f3f73);
  NONFAILING(*(uint64_t*)0x20b2f018 = 2);
  NONFAILING(*(uint64_t*)0x20b2f020 = 0x20590000);
  NONFAILING(*(uint64_t*)0x20b2f028 = 0);
  NONFAILING(*(uint32_t*)0x20b2f030 = 0);
  NONFAILING(*(uint64_t*)0x204f3f73 = 0x20284f81);
  NONFAILING(*(uint64_t*)0x204f3f7b = 0x7f);
  NONFAILING(*(uint64_t*)0x204f3f83 = 0x203bc000);
  NONFAILING(*(uint64_t*)0x204f3f8b = 0xc6);
  syscall(__NR_recvmsg, r[2], 0x20b2f000, 0);
}

int main()
{
  for (procid = 0; procid < 8; procid++) {
    if (fork() == 0) {
      install_segv_handler();
      for (;;) {
        loop();
      }
    }
  }
  sleep(1000000);
  return 0;
}