syzkaller-repros/linux/c7973e7b3530d01b1864e5b58377116c6bf1c7fa.c

// KMSAN: kernel-infoleak in sctp_getsockopt
// https://syzkaller.appspot.com/bug?id=c7973e7b3530d01b1864e5b58377116c6bf1c7fa
// status:fixed
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <arpa/inet.h>
#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <net/if_arp.h>
#include <netinet/in.h>
#include <pthread.h>
#include <sched.h>
#include <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/mount.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 <time.h>
#include <unistd.h>

#include <linux/capability.h>
#include <linux/futex.h>
#include <linux/if.h>
#include <linux/if_ether.h>
#include <linux/if_tun.h>
#include <linux/ip.h>
#include <linux/net.h>
#include <linux/tcp.h>

unsigned long long procid;

static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* ctx)
{
  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);
  }
  exit(sig);
}

static void install_segv_handler(void)
{
  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 void sleep_ms(uint64_t ms)
{
  usleep(ms * 1000);
}

static uint64_t current_time_ms(void)
{
  struct timespec ts;
  if (clock_gettime(CLOCK_MONOTONIC, &ts))
    exit(1);
  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

static void use_temporary_dir(void)
{
  char tmpdir_template[] = "./syzkaller.XXXXXX";
  char* tmpdir = mkdtemp(tmpdir_template);
  if (!tmpdir)
    exit(1);
  if (chmod(tmpdir, 0777))
    exit(1);
  if (chdir(tmpdir))
    exit(1);
}

static void thread_start(void* (*fn)(void*), void* arg)
{
  pthread_t th;
  pthread_attr_t attr;
  pthread_attr_init(&attr);
  pthread_attr_setstacksize(&attr, 128 << 10);
  if (pthread_create(&th, &attr, fn, arg))
    exit(1);
  pthread_attr_destroy(&attr);
}

typedef struct {
  int state;
} event_t;

static void event_init(event_t* ev)
{
  ev->state = 0;
}

static void event_reset(event_t* ev)
{
  ev->state = 0;
}

static void event_set(event_t* ev)
{
  if (ev->state)
    exit(1);
  __atomic_store_n(&ev->state, 1, __ATOMIC_RELEASE);
  syscall(SYS_futex, &ev->state, FUTEX_WAKE | FUTEX_PRIVATE_FLAG);
}

static void event_wait(event_t* ev)
{
  while (!__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE))
    syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, 0);
}

static int event_isset(event_t* ev)
{
  return __atomic_load_n(&ev->state, __ATOMIC_ACQUIRE);
}

static int event_timedwait(event_t* ev, uint64_t timeout)
{
  uint64_t start = current_time_ms();
  uint64_t now = start;
  for (;;) {
    uint64_t remain = timeout - (now - start);
    struct timespec ts;
    ts.tv_sec = remain / 1000;
    ts.tv_nsec = (remain % 1000) * 1000 * 1000;
    syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, &ts);
    if (__atomic_load_n(&ev->state, __ATOMIC_RELAXED))
      return 1;
    now = current_time_ms();
    if (now - start > timeout)
      return 0;
  }
}

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)
    exit(1);
  if ((size_t)rv >= size)
    exit(1);
}

#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)
      exit(1);
  }
}

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 = 240;
  if (dup2(tunfd, kTunFd) < 0)
    exit(1);
  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)
      exit(1);
  }
  if (ioctl(tunfd, TUNGETIFF, (void*)&ifr) < 0)
    exit(1);
  tun_frags_enabled = (ifr.ifr_flags & IFF_NAPI_FRAGS) != 0;
  execute_command(0, "sysctl -w net.ipv6.conf.%s.accept_dad=0", TUN_IFACE);
  execute_command(0, "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 neigh add %s lladdr %s dev %s nud permanent",
                  REMOTE_IPV4, REMOTE_MAC, TUN_IFACE);
  execute_command(0, "ip -6 addr add %s/120 dev %s", LOCAL_IPV6, TUN_IFACE);
  execute_command(0, "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 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 int read_tun(char* data, int size)
{
  if (tunfd < 0)
    return -1;
  int rv = read(tunfd, data, size);
  if (rv < 0) {
    if (errno == EAGAIN)
      return -1;
    if (errno == EBADFD)
      return -1;
    exit(1);
  }
  return rv;
}

static void flush_tun()
{
  char data[SYZ_TUN_MAX_PACKET_SIZE];
  while (read_tun(&data[0], sizeof(data)) != -1) {
  }
}

static bool write_file(const char* file, const char* what, ...)
{
  char buf[1024];
  va_list args;
  va_start(args, what);
  vsnprintf(buf, sizeof(buf), what, args);
  va_end(args);
  buf[sizeof(buf) - 1] = 0;
  int len = strlen(buf);
  int fd = open(file, O_WRONLY | O_CLOEXEC);
  if (fd == -1)
    return false;
  if (write(fd, buf, len) != len) {
    int err = errno;
    close(fd);
    errno = err;
    return false;
  }
  close(fd);
  return true;
}

#define XT_TABLE_SIZE 1536
#define XT_MAX_ENTRIES 10

struct xt_counters {
  uint64_t pcnt, bcnt;
};

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[XT_TABLE_SIZE / sizeof(void*)];
};

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[XT_TABLE_SIZE];
};

struct ipt_table_desc {
  const char* name;
  struct ipt_getinfo info;
  struct ipt_replace replace;
};

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

static struct ipt_table_desc ipv6_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)

struct arpt_getinfo {
  char name[32];
  unsigned int valid_hooks;
  unsigned int hook_entry[3];
  unsigned int underflow[3];
  unsigned int num_entries;
  unsigned int size;
};

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

struct arpt_replace {
  char name[32];
  unsigned int valid_hooks;
  unsigned int num_entries;
  unsigned int size;
  unsigned int hook_entry[3];
  unsigned int underflow[3];
  unsigned int num_counters;
  struct xt_counters* counters;
  char entrytable[XT_TABLE_SIZE];
};

struct arpt_table_desc {
  const char* name;
  struct arpt_getinfo info;
  struct arpt_replace replace;
};

static struct arpt_table_desc arpt_tables[] = {
    {.name = "filter"},
};

#define ARPT_BASE_CTL 96
#define ARPT_SO_SET_REPLACE (ARPT_BASE_CTL)
#define ARPT_SO_GET_INFO (ARPT_BASE_CTL)
#define ARPT_SO_GET_ENTRIES (ARPT_BASE_CTL + 1)

static void checkpoint_iptables(struct ipt_table_desc* tables, int num_tables,
                                int family, int level)
{
  struct ipt_get_entries entries;
  socklen_t optlen;
  int fd, i;
  fd = socket(family, SOCK_STREAM, IPPROTO_TCP);
  if (fd == -1) {
    switch (errno) {
    case EAFNOSUPPORT:
    case ENOPROTOOPT:
      return;
    }
    exit(1);
  }
  for (i = 0; i < num_tables; i++) {
    struct ipt_table_desc* table = &tables[i];
    strcpy(table->info.name, table->name);
    strcpy(table->replace.name, table->name);
    optlen = sizeof(table->info);
    if (getsockopt(fd, level, IPT_SO_GET_INFO, &table->info, &optlen)) {
      switch (errno) {
      case EPERM:
      case ENOENT:
      case ENOPROTOOPT:
        continue;
      }
      exit(1);
    }
    if (table->info.size > sizeof(table->replace.entrytable))
      exit(1);
    if (table->info.num_entries > XT_MAX_ENTRIES)
      exit(1);
    memset(&entries, 0, sizeof(entries));
    strcpy(entries.name, table->name);
    entries.size = table->info.size;
    optlen = sizeof(entries) - sizeof(entries.entrytable) + table->info.size;
    if (getsockopt(fd, level, IPT_SO_GET_ENTRIES, &entries, &optlen))
      exit(1);
    table->replace.valid_hooks = table->info.valid_hooks;
    table->replace.num_entries = table->info.num_entries;
    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, entries.entrytable, table->info.size);
  }
  close(fd);
}

static void reset_iptables(struct ipt_table_desc* tables, int num_tables,
                           int family, int level)
{
  struct xt_counters counters[XT_MAX_ENTRIES];
  struct ipt_get_entries entries;
  struct ipt_getinfo info;
  socklen_t optlen;
  int fd, i;
  fd = socket(family, SOCK_STREAM, IPPROTO_TCP);
  if (fd == -1) {
    switch (errno) {
    case EAFNOSUPPORT:
    case ENOPROTOOPT:
      return;
    }
    exit(1);
  }
  for (i = 0; i < num_tables; i++) {
    struct ipt_table_desc* table = &tables[i];
    if (table->info.valid_hooks == 0)
      continue;
    memset(&info, 0, sizeof(info));
    strcpy(info.name, table->name);
    optlen = sizeof(info);
    if (getsockopt(fd, level, IPT_SO_GET_INFO, &info, &optlen))
      exit(1);
    if (memcmp(&table->info, &info, sizeof(table->info)) == 0) {
      memset(&entries, 0, sizeof(entries));
      strcpy(entries.name, table->name);
      entries.size = table->info.size;
      optlen = sizeof(entries) - sizeof(entries.entrytable) + entries.size;
      if (getsockopt(fd, level, IPT_SO_GET_ENTRIES, &entries, &optlen))
        exit(1);
      if (memcmp(table->replace.entrytable, entries.entrytable,
                 table->info.size) == 0)
        continue;
    }
    table->replace.num_counters = info.num_entries;
    table->replace.counters = counters;
    optlen = sizeof(table->replace) - sizeof(table->replace.entrytable) +
             table->replace.size;
    if (setsockopt(fd, level, IPT_SO_SET_REPLACE, &table->replace, optlen))
      exit(1);
  }
  close(fd);
}

static void checkpoint_arptables(void)
{
  struct arpt_get_entries entries;
  socklen_t optlen;
  unsigned i;
  int fd;
  fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
  if (fd == -1) {
    switch (errno) {
    case EAFNOSUPPORT:
    case ENOPROTOOPT:
      return;
    }
    exit(1);
  }
  for (i = 0; i < sizeof(arpt_tables) / sizeof(arpt_tables[0]); i++) {
    struct arpt_table_desc* table = &arpt_tables[i];
    strcpy(table->info.name, table->name);
    strcpy(table->replace.name, table->name);
    optlen = sizeof(table->info);
    if (getsockopt(fd, SOL_IP, ARPT_SO_GET_INFO, &table->info, &optlen)) {
      switch (errno) {
      case EPERM:
      case ENOENT:
      case ENOPROTOOPT:
        continue;
      }
      exit(1);
    }
    if (table->info.size > sizeof(table->replace.entrytable))
      exit(1);
    if (table->info.num_entries > XT_MAX_ENTRIES)
      exit(1);
    memset(&entries, 0, sizeof(entries));
    strcpy(entries.name, table->name);
    entries.size = table->info.size;
    optlen = sizeof(entries) - sizeof(entries.entrytable) + table->info.size;
    if (getsockopt(fd, SOL_IP, ARPT_SO_GET_ENTRIES, &entries, &optlen))
      exit(1);
    table->replace.valid_hooks = table->info.valid_hooks;
    table->replace.num_entries = table->info.num_entries;
    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, entries.entrytable, table->info.size);
  }
  close(fd);
}

static void reset_arptables()
{
  struct xt_counters counters[XT_MAX_ENTRIES];
  struct arpt_get_entries entries;
  struct arpt_getinfo info;
  socklen_t optlen;
  unsigned i;
  int fd;
  fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
  if (fd == -1) {
    switch (errno) {
    case EAFNOSUPPORT:
    case ENOPROTOOPT:
      return;
    }
    exit(1);
  }
  for (i = 0; i < sizeof(arpt_tables) / sizeof(arpt_tables[0]); i++) {
    struct arpt_table_desc* table = &arpt_tables[i];
    if (table->info.valid_hooks == 0)
      continue;
    memset(&info, 0, sizeof(info));
    strcpy(info.name, table->name);
    optlen = sizeof(info);
    if (getsockopt(fd, SOL_IP, ARPT_SO_GET_INFO, &info, &optlen))
      exit(1);
    if (memcmp(&table->info, &info, sizeof(table->info)) == 0) {
      memset(&entries, 0, sizeof(entries));
      strcpy(entries.name, table->name);
      entries.size = table->info.size;
      optlen = sizeof(entries) - sizeof(entries.entrytable) + entries.size;
      if (getsockopt(fd, SOL_IP, ARPT_SO_GET_ENTRIES, &entries, &optlen))
        exit(1);
      if (memcmp(table->replace.entrytable, entries.entrytable,
                 table->info.size) == 0)
        continue;
    } else {
    }
    table->replace.num_counters = info.num_entries;
    table->replace.counters = counters;
    optlen = sizeof(table->replace) - sizeof(table->replace.entrytable) +
             table->replace.size;
    if (setsockopt(fd, SOL_IP, ARPT_SO_SET_REPLACE, &table->replace, optlen))
      exit(1);
  }
  close(fd);
}

#define NF_BR_NUMHOOKS 6
#define EBT_TABLE_MAXNAMELEN 32
#define EBT_CHAIN_MAXNAMELEN 32
#define EBT_BASE_CTL 128
#define EBT_SO_SET_ENTRIES (EBT_BASE_CTL)
#define EBT_SO_GET_INFO (EBT_BASE_CTL)
#define EBT_SO_GET_ENTRIES (EBT_SO_GET_INFO + 1)
#define EBT_SO_GET_INIT_INFO (EBT_SO_GET_ENTRIES + 1)
#define EBT_SO_GET_INIT_ENTRIES (EBT_SO_GET_INIT_INFO + 1)

struct ebt_replace {
  char name[EBT_TABLE_MAXNAMELEN];
  unsigned int valid_hooks;
  unsigned int nentries;
  unsigned int entries_size;
  struct ebt_entries* hook_entry[NF_BR_NUMHOOKS];
  unsigned int num_counters;
  struct ebt_counter* counters;
  char* entries;
};

struct ebt_entries {
  unsigned int distinguisher;
  char name[EBT_CHAIN_MAXNAMELEN];
  unsigned int counter_offset;
  int policy;
  unsigned int nentries;
  char data[0] __attribute__((aligned(__alignof__(struct ebt_replace))));
};

struct ebt_table_desc {
  const char* name;
  struct ebt_replace replace;
  char entrytable[XT_TABLE_SIZE];
};

static struct ebt_table_desc ebt_tables[] = {
    {.name = "filter"},
    {.name = "nat"},
    {.name = "broute"},
};

static void checkpoint_ebtables(void)
{
  socklen_t optlen;
  unsigned i;
  int fd;
  fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
  if (fd == -1) {
    switch (errno) {
    case EAFNOSUPPORT:
    case ENOPROTOOPT:
      return;
    }
    exit(1);
  }
  for (i = 0; i < sizeof(ebt_tables) / sizeof(ebt_tables[0]); i++) {
    struct ebt_table_desc* table = &ebt_tables[i];
    strcpy(table->replace.name, table->name);
    optlen = sizeof(table->replace);
    if (getsockopt(fd, SOL_IP, EBT_SO_GET_INIT_INFO, &table->replace,
                   &optlen)) {
      switch (errno) {
      case EPERM:
      case ENOENT:
      case ENOPROTOOPT:
        continue;
      }
      exit(1);
    }
    if (table->replace.entries_size > sizeof(table->entrytable))
      exit(1);
    table->replace.num_counters = 0;
    table->replace.entries = table->entrytable;
    optlen = sizeof(table->replace) + table->replace.entries_size;
    if (getsockopt(fd, SOL_IP, EBT_SO_GET_INIT_ENTRIES, &table->replace,
                   &optlen))
      exit(1);
  }
  close(fd);
}

static void reset_ebtables()
{
  struct ebt_replace replace;
  char entrytable[XT_TABLE_SIZE];
  socklen_t optlen;
  unsigned i, j, h;
  int fd;
  fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
  if (fd == -1) {
    switch (errno) {
    case EAFNOSUPPORT:
    case ENOPROTOOPT:
      return;
    }
    exit(1);
  }
  for (i = 0; i < sizeof(ebt_tables) / sizeof(ebt_tables[0]); i++) {
    struct ebt_table_desc* table = &ebt_tables[i];
    if (table->replace.valid_hooks == 0)
      continue;
    memset(&replace, 0, sizeof(replace));
    strcpy(replace.name, table->name);
    optlen = sizeof(replace);
    if (getsockopt(fd, SOL_IP, EBT_SO_GET_INFO, &replace, &optlen))
      exit(1);
    replace.num_counters = 0;
    table->replace.entries = 0;
    for (h = 0; h < NF_BR_NUMHOOKS; h++)
      table->replace.hook_entry[h] = 0;
    if (memcmp(&table->replace, &replace, sizeof(table->replace)) == 0) {
      memset(&entrytable, 0, sizeof(entrytable));
      replace.entries = entrytable;
      optlen = sizeof(replace) + replace.entries_size;
      if (getsockopt(fd, SOL_IP, EBT_SO_GET_ENTRIES, &replace, &optlen))
        exit(1);
      if (memcmp(table->entrytable, entrytable, replace.entries_size) == 0)
        continue;
    }
    for (j = 0, h = 0; h < NF_BR_NUMHOOKS; h++) {
      if (table->replace.valid_hooks & (1 << h)) {
        table->replace.hook_entry[h] =
            (struct ebt_entries*)table->entrytable + j;
        j++;
      }
    }
    table->replace.entries = table->entrytable;
    optlen = sizeof(table->replace) + table->replace.entries_size;
    if (setsockopt(fd, SOL_IP, EBT_SO_SET_ENTRIES, &table->replace, optlen))
      exit(1);
  }
  close(fd);
}

static void checkpoint_net_namespace(void)
{
  checkpoint_ebtables();
  checkpoint_arptables();
  checkpoint_iptables(ipv4_tables, sizeof(ipv4_tables) / sizeof(ipv4_tables[0]),
                      AF_INET, SOL_IP);
  checkpoint_iptables(ipv6_tables, sizeof(ipv6_tables) / sizeof(ipv6_tables[0]),
                      AF_INET6, SOL_IPV6);
}

static void reset_net_namespace(void)
{
  reset_ebtables();
  reset_arptables();
  reset_iptables(ipv4_tables, sizeof(ipv4_tables) / sizeof(ipv4_tables[0]),
                 AF_INET, SOL_IP);
  reset_iptables(ipv6_tables, sizeof(ipv6_tables) / sizeof(ipv6_tables[0]),
                 AF_INET6, SOL_IPV6);
}

static void setup_cgroups()
{
  if (mkdir("/syzcgroup", 0777)) {
  }
  if (mkdir("/syzcgroup/unified", 0777)) {
  }
  if (mount("none", "/syzcgroup/unified", "cgroup2", 0, NULL)) {
  }
  if (chmod("/syzcgroup/unified", 0777)) {
  }
  if (!write_file("/syzcgroup/unified/cgroup.subtree_control",
                  "+cpu +memory +io +pids +rdma")) {
  }
  if (mkdir("/syzcgroup/cpu", 0777)) {
  }
  if (mount("none", "/syzcgroup/cpu", "cgroup", 0,
            "cpuset,cpuacct,perf_event,hugetlb")) {
  }
  if (!write_file("/syzcgroup/cpu/cgroup.clone_children", "1")) {
  }
  if (chmod("/syzcgroup/cpu", 0777)) {
  }
  if (mkdir("/syzcgroup/net", 0777)) {
  }
  if (mount("none", "/syzcgroup/net", "cgroup", 0,
            "net_cls,net_prio,devices,freezer")) {
  }
  if (chmod("/syzcgroup/net", 0777)) {
  }
}
static void setup_binfmt_misc()
{
  if (mount(0, "/proc/sys/fs/binfmt_misc", "binfmt_misc", 0, 0)) {
  }
  if (!write_file("/proc/sys/fs/binfmt_misc/register",
                  ":syz0:M:0:\x01::./file0:")) {
  }
  if (!write_file("/proc/sys/fs/binfmt_misc/register",
                  ":syz1:M:1:\x02::./file0:POC")) {
  }
}

static void setup_common()
{
  if (mount(0, "/sys/fs/fuse/connections", "fusectl", 0, 0)) {
  }
  setup_cgroups();
  setup_binfmt_misc();
}

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 = 200 << 20;
  setrlimit(RLIMIT_AS, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 32 << 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);
  rlim.rlim_cur = rlim.rlim_max = 256;
  setrlimit(RLIMIT_NOFILE, &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)
    exit(1);
  int status = 0;
  while (waitpid(-1, &status, __WALL) != pid) {
  }
  return WEXITSTATUS(status);
}

static int real_uid;
static int real_gid;
__attribute__((aligned(64 << 10))) static char sandbox_stack[1 << 20];

static int namespace_sandbox_proc(void* arg)
{
  sandbox_common();
  write_file("/proc/self/setgroups", "deny");
  if (!write_file("/proc/self/uid_map", "0 %d 1\n", real_uid))
    exit(1);
  if (!write_file("/proc/self/gid_map", "0 %d 1\n", real_gid))
    exit(1);
  if (unshare(CLONE_NEWNET))
    exit(1);
  initialize_tun();
  initialize_netdevices();
  if (mkdir("./syz-tmp", 0777))
    exit(1);
  if (mount("", "./syz-tmp", "tmpfs", 0, NULL))
    exit(1);
  if (mkdir("./syz-tmp/newroot", 0777))
    exit(1);
  if (mkdir("./syz-tmp/newroot/dev", 0700))
    exit(1);
  unsigned bind_mount_flags = MS_BIND | MS_REC | MS_PRIVATE;
  if (mount("/dev", "./syz-tmp/newroot/dev", NULL, bind_mount_flags, NULL))
    exit(1);
  if (mkdir("./syz-tmp/newroot/proc", 0700))
    exit(1);
  if (mount(NULL, "./syz-tmp/newroot/proc", "proc", 0, NULL))
    exit(1);
  if (mkdir("./syz-tmp/newroot/selinux", 0700))
    exit(1);
  const char* selinux_path = "./syz-tmp/newroot/selinux";
  if (mount("/selinux", selinux_path, NULL, bind_mount_flags, NULL)) {
    if (errno != ENOENT)
      exit(1);
    if (mount("/sys/fs/selinux", selinux_path, NULL, bind_mount_flags, NULL) &&
        errno != ENOENT)
      exit(1);
  }
  if (mkdir("./syz-tmp/newroot/sys", 0700))
    exit(1);
  if (mount("/sys", "./syz-tmp/newroot/sys", 0, bind_mount_flags, NULL))
    exit(1);
  if (mkdir("./syz-tmp/newroot/syzcgroup", 0700))
    exit(1);
  if (mkdir("./syz-tmp/newroot/syzcgroup/unified", 0700))
    exit(1);
  if (mkdir("./syz-tmp/newroot/syzcgroup/cpu", 0700))
    exit(1);
  if (mkdir("./syz-tmp/newroot/syzcgroup/net", 0700))
    exit(1);
  if (mount("/syzcgroup/unified", "./syz-tmp/newroot/syzcgroup/unified", NULL,
            bind_mount_flags, NULL)) {
  }
  if (mount("/syzcgroup/cpu", "./syz-tmp/newroot/syzcgroup/cpu", NULL,
            bind_mount_flags, NULL)) {
  }
  if (mount("/syzcgroup/net", "./syz-tmp/newroot/syzcgroup/net", NULL,
            bind_mount_flags, NULL)) {
  }
  if (mkdir("./syz-tmp/pivot", 0777))
    exit(1);
  if (syscall(SYS_pivot_root, "./syz-tmp", "./syz-tmp/pivot")) {
    if (chdir("./syz-tmp"))
      exit(1);
  } else {
    if (chdir("/"))
      exit(1);
    if (umount2("./pivot", MNT_DETACH))
      exit(1);
  }
  if (chroot("./newroot"))
    exit(1);
  if (chdir("/"))
    exit(1);
  struct __user_cap_header_struct cap_hdr = {};
  struct __user_cap_data_struct cap_data[2] = {};
  cap_hdr.version = _LINUX_CAPABILITY_VERSION_3;
  cap_hdr.pid = getpid();
  if (syscall(SYS_capget, &cap_hdr, &cap_data))
    exit(1);
  cap_data[0].effective &= ~(1 << CAP_SYS_PTRACE);
  cap_data[0].permitted &= ~(1 << CAP_SYS_PTRACE);
  cap_data[0].inheritable &= ~(1 << CAP_SYS_PTRACE);
  if (syscall(SYS_capset, &cap_hdr, &cap_data))
    exit(1);
  loop();
  exit(1);
}

#define SYZ_HAVE_SANDBOX_NAMESPACE 1
static int do_sandbox_namespace(void)
{
  int pid;
  setup_common();
  real_uid = getuid();
  real_gid = getgid();
  mprotect(sandbox_stack, 4096, PROT_NONE);
  pid =
      clone(namespace_sandbox_proc, &sandbox_stack[sizeof(sandbox_stack) - 64],
            CLONE_NEWUSER | CLONE_NEWPID, 0);
  return wait_for_loop(pid);
}

#define FS_IOC_SETFLAGS _IOW('f', 2, long)
static void remove_dir(const char* dir)
{
  DIR* dp;
  struct dirent* ep;
  int iter = 0;
retry:
  while (umount2(dir, MNT_DETACH) == 0) {
  }
  dp = opendir(dir);
  if (dp == NULL) {
    if (errno == EMFILE) {
      exit(1);
    }
    exit(1);
  }
  while ((ep = readdir(dp))) {
    if (strcmp(ep->d_name, ".") == 0 || strcmp(ep->d_name, "..") == 0)
      continue;
    char filename[FILENAME_MAX];
    snprintf(filename, sizeof(filename), "%s/%s", dir, ep->d_name);
    while (umount2(filename, MNT_DETACH) == 0) {
    }
    struct stat st;
    if (lstat(filename, &st))
      exit(1);
    if (S_ISDIR(st.st_mode)) {
      remove_dir(filename);
      continue;
    }
    int i;
    for (i = 0;; i++) {
      if (unlink(filename) == 0)
        break;
      if (errno == EPERM) {
        int fd = open(filename, O_RDONLY);
        if (fd != -1) {
          long flags = 0;
          if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0)
            close(fd);
          continue;
        }
      }
      if (errno == EROFS) {
        break;
      }
      if (errno != EBUSY || i > 100)
        exit(1);
      if (umount2(filename, MNT_DETACH))
        exit(1);
    }
  }
  closedir(dp);
  int i;
  for (i = 0;; i++) {
    if (rmdir(dir) == 0)
      break;
    if (i < 100) {
      if (errno == EPERM) {
        int fd = open(dir, O_RDONLY);
        if (fd != -1) {
          long flags = 0;
          if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0)
            close(fd);
          continue;
        }
      }
      if (errno == EROFS) {
        break;
      }
      if (errno == EBUSY) {
        if (umount2(dir, MNT_DETACH))
          exit(1);
        continue;
      }
      if (errno == ENOTEMPTY) {
        if (iter < 100) {
          iter++;
          goto retry;
        }
      }
    }
    exit(1);
  }
}

static void kill_and_wait(int pid, int* status)
{
  kill(-pid, SIGKILL);
  kill(pid, SIGKILL);
  int i;
  for (i = 0; i < 100; i++) {
    if (waitpid(-1, status, WNOHANG | __WALL) == pid)
      return;
    usleep(1000);
  }
  DIR* dir = opendir("/sys/fs/fuse/connections");
  if (dir) {
    for (;;) {
      struct dirent* ent = readdir(dir);
      if (!ent)
        break;
      if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0)
        continue;
      char abort[300];
      snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort",
               ent->d_name);
      int fd = open(abort, O_WRONLY);
      if (fd == -1) {
        continue;
      }
      if (write(fd, abort, 1) < 0) {
      }
      close(fd);
    }
    closedir(dir);
  } else {
  }
  while (waitpid(-1, status, __WALL) != pid) {
  }
}

#define SYZ_HAVE_SETUP_LOOP 1
static void setup_loop()
{
  int pid = getpid();
  char cgroupdir[64];
  char file[128];
  snprintf(cgroupdir, sizeof(cgroupdir), "/syzcgroup/unified/syz%llu", procid);
  if (mkdir(cgroupdir, 0777)) {
  }
  snprintf(file, sizeof(file), "%s/pids.max", cgroupdir);
  if (!write_file(file, "32")) {
  }
  snprintf(file, sizeof(file), "%s/memory.low", cgroupdir);
  if (!write_file(file, "%d", 298 << 20)) {
  }
  snprintf(file, sizeof(file), "%s/memory.high", cgroupdir);
  if (!write_file(file, "%d", 299 << 20)) {
  }
  snprintf(file, sizeof(file), "%s/memory.max", cgroupdir);
  if (!write_file(file, "%d", 300 << 20)) {
  }
  snprintf(file, sizeof(file), "%s/cgroup.procs", cgroupdir);
  if (!write_file(file, "%d", pid)) {
  }
  snprintf(cgroupdir, sizeof(cgroupdir), "/syzcgroup/cpu/syz%llu", procid);
  if (mkdir(cgroupdir, 0777)) {
  }
  snprintf(file, sizeof(file), "%s/cgroup.procs", cgroupdir);
  if (!write_file(file, "%d", pid)) {
  }
  snprintf(cgroupdir, sizeof(cgroupdir), "/syzcgroup/net/syz%llu", procid);
  if (mkdir(cgroupdir, 0777)) {
  }
  snprintf(file, sizeof(file), "%s/cgroup.procs", cgroupdir);
  if (!write_file(file, "%d", pid)) {
  }
  checkpoint_net_namespace();
}

#define SYZ_HAVE_RESET_LOOP 1
static void reset_loop()
{
  reset_net_namespace();
}

#define SYZ_HAVE_SETUP_TEST 1
static void setup_test()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
  char cgroupdir[64];
  snprintf(cgroupdir, sizeof(cgroupdir), "/syzcgroup/unified/syz%llu", procid);
  if (symlink(cgroupdir, "./cgroup")) {
  }
  snprintf(cgroupdir, sizeof(cgroupdir), "/syzcgroup/cpu/syz%llu", procid);
  if (symlink(cgroupdir, "./cgroup.cpu")) {
  }
  snprintf(cgroupdir, sizeof(cgroupdir), "/syzcgroup/net/syz%llu", procid);
  if (symlink(cgroupdir, "./cgroup.net")) {
  }
  if (!write_file("/proc/self/oom_score_adj", "1000")) {
  }
  flush_tun();
}

#define SYZ_HAVE_RESET_TEST 1
static void reset_test()
{
  int fd;
  for (fd = 3; fd < 30; fd++)
    close(fd);
}

struct thread_t {
  int created, call;
  event_t ready, done;
};

static struct thread_t threads[16];
static void execute_call(int call);
static int running;

static void* thr(void* arg)
{
  struct thread_t* th = (struct thread_t*)arg;
  for (;;) {
    event_wait(&th->ready);
    event_reset(&th->ready);
    execute_call(th->call);
    __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
    event_set(&th->done);
  }
  return 0;
}

static void execute_one(void)
{
  int i, call, thread;
  int collide = 0;
again:
  for (call = 0; call < 8; call++) {
    for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0]));
         thread++) {
      struct thread_t* th = &threads[thread];
      if (!th->created) {
        th->created = 1;
        event_init(&th->ready);
        event_init(&th->done);
        event_set(&th->done);
        thread_start(thr, th);
      }
      if (!event_isset(&th->done))
        continue;
      event_reset(&th->done);
      th->call = call;
      __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
      event_set(&th->ready);
      if (collide && (call % 2) == 0)
        break;
      event_timedwait(&th->done, 45);
      break;
    }
  }
  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
    sleep_ms(1);
  if (!collide) {
    collide = 1;
    goto again;
  }
}

static void execute_one(void);

#define WAIT_FLAGS __WALL

static void loop(void)
{
  setup_loop();
  int iter;
  for (iter = 0;; iter++) {
    char cwdbuf[32];
    sprintf(cwdbuf, "./%d", iter);
    if (mkdir(cwdbuf, 0777))
      exit(1);
    reset_loop();
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      if (chdir(cwdbuf))
        exit(1);
      setup_test();
      execute_one();
      reset_test();
      exit(0);
    }
    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      sleep_ms(1);
      if (current_time_ms() - start < 5 * 1000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
    remove_dir(cwdbuf);
  }
}
#ifndef __NR_bpf
#define __NR_bpf 321
#endif

uint64_t r[1] = {0xffffffffffffffff};

void execute_call(int call)
{
  long res;
  switch (call) {
  case 0:
    res = syscall(__NR_socket, 0xa, 5, 0);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    NONFAILING(*(uint16_t*)0x200010c0 = 0xa);
    NONFAILING(*(uint16_t*)0x200010c2 = htobe16(0));
    NONFAILING(*(uint32_t*)0x200010c4 = 0);
    NONFAILING(*(uint8_t*)0x200010c8 = 0);
    NONFAILING(*(uint8_t*)0x200010c9 = 0);
    NONFAILING(*(uint8_t*)0x200010ca = 0);
    NONFAILING(*(uint8_t*)0x200010cb = 0);
    NONFAILING(*(uint8_t*)0x200010cc = 0);
    NONFAILING(*(uint8_t*)0x200010cd = 0);
    NONFAILING(*(uint8_t*)0x200010ce = 0);
    NONFAILING(*(uint8_t*)0x200010cf = 0);
    NONFAILING(*(uint8_t*)0x200010d0 = 0);
    NONFAILING(*(uint8_t*)0x200010d1 = 0);
    NONFAILING(*(uint8_t*)0x200010d2 = 0);
    NONFAILING(*(uint8_t*)0x200010d3 = 0);
    NONFAILING(*(uint8_t*)0x200010d4 = 0);
    NONFAILING(*(uint8_t*)0x200010d5 = 0);
    NONFAILING(*(uint8_t*)0x200010d6 = 0);
    NONFAILING(*(uint8_t*)0x200010d7 = 0);
    NONFAILING(*(uint32_t*)0x200010d8 = 0);
    syscall(__NR_setsockopt, r[0], 0x84, 0x64, 0x200010c0, 0x1c);
    break;
  case 2:
    NONFAILING(*(uint32_t*)0x20001100 = 0);
    NONFAILING(*(uint32_t*)0x20001104 = 0x1000);
    NONFAILING(memcpy(
        (void*)0x20001108,
        "\x09\x16\x5f\x14\x04\xe9\x87\xcd\xdd\x0f\x56\x36\x17\xdb\xb2\x91\x7d"
        "\x39\xa7\x34\x3a\xea\x07\x5d\x23\xfb\xfc\x9c\xf3\x29\xc7\xaf\xa7\x82"
        "\x45\xfe\xd9\x81\xb4\xf6\x72\x80\x23\x16\x24\x9b\xdb\x3a\x0c\xe0\xc8"
        "\x3b\x7d\x91\xe0\x42\xa3\x4b\xed\x7e\x71\x0f\x12\x24\x68\x8d\xa2\x9a"
        "\x35\xb0\x9f\x8c\x35\xfc\x7c\xab\x3b\xb3\x29\x53\xf1\xc6\x32\x7c\xe9"
        "\xa5\x2b\x5f\xbe\x3d\x70\x2e\x7a\x03\xbe\xde\x92\x3b\x5f\xe3\x7b\xcd"
        "\xc2\xcc\xfa\x86\x4f\x04\xab\x76\xd4\x82\xc5\x95\x47\x1c\x91\xca\x00"
        "\x25\xc7\x48\x3e\x20\x12\xf2\x60\x85\x76\x5e\x88\xcf\x53\x78\xdd\xc1"
        "\xf0\xf3\xd1\x63\xe8\xfa\x47\x58\x01\x80\x8a\xc5\x3c\x61\x98\x53\x7d"
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        "\x4b\xe6\xd9\xb8\x20\xcc\x3b\xbf\x5a\xe2\x52\xdf\xe9\x39\xdb\x5f\xb7"
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        "\x1d\x71\xac\x0a\xf4\x6e\xb4\x2c\x7f\xfc\xe5\xa1\x09\xfd\x43\x52\x85"
        "\xf0\x22\x0a\x1b\x34\x96\x05\x6d\xe7\x73\x08\x9f\xe2\xc2\x80\x5a\x4c"
        "\xcf\xc4\x30\xa5\x21\x31\x3a\x5c\x37\x65\x57\xce\xee\x4c\x83\x14\x3f"
        "\xbd\x1d\x13\xc3\x04\x6b\x08\x10\x73\xb6\x57\xb1\xba\xe9\xa9\x2a\x3e"
        "\xb7\x39\xb3\x43\x5c\xbf\xc4\x0c\xc4\xf3\x98\xf9\x65\xfa\x7d\x21\x7b"
        "\x34\xd4\x58\xc2\xa4\xb4\x70\x6b\x8c\xc8\x3d\xa9\xcf\xe6\x5f\x88\xb5"
        "\xb9\xbb\x7e\x25\x5d\xc5\xd1\xe0\x70\x80\xac\x5d\xad\x8a\x1d\x52\xa8"
        "\xf7\x73\x46\x13\xf5\x97\x3f\x77\xb2\x8c\xe1\x1b\x81\xb2\xcd\x08\xb2"
        "\x91\x58\xfe\x64\x60\xf6\xdb\x60\xa4\xce\xa9\x90\x12\xf2\x01\x8f\x7e"
        "\x85\x10\x58\xb4\x92\x9e\x50\xf1\xbb\xb6\xd5\xdb\x55\x76\x65\x03\xc8"
        "\x8d\x62\x32\xfe\xe5\x4b\x22\x57\xe2\x17\xeb\xbb\x58\x44\x2b\x0d\xd1"
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        "\x94\x1a\xb5\x19\x56\x82\xc8\x02\xcc\xcb\x4f\x8a\x8d\x2f\xf2\x6c\x87"
        "\x45\xe8\x7b\x30\x1a\x67\x64\x50\xe7\x10\xbf\xba\xb7\x69\x9c\x87\xda"
        "\x00\xde\x2c\x0c\xdf\x33\x06\xde\x2c\xce\x5b\x79\xdf\x06\x09\x3a\x43"
        "\x50\x85\x86\x1c\x02\xab\xdc\x98\x30\xf5\xe3\x0c\xcd\xad\x97\x38\x80"
        "\x4f\xa4\x63\x8a\xbb\x1d\x6a\x67\xe7\xfc\x9d\x5e\xdf\x9f\x55\x43\x16"
        "\x4f\x68\x23\x34\xf6\x8f\x09\x8c\x26\xac\x08\x01\x8c\x9e\x98\x15\x62"
        "\x05\x43\x3f\xa3\xf5\x0f\xb3\x1c\xc1\x8a\xb8\xb3\x13\x91\x77\x6a\x04"
        "\x00\x91\x96\xf4\xc0\xd3\x49\xd1\xc0\xa2\x57\x9f\x51\x35\x30\x20\x78"
        "\x79\xb7\xf1\xb1\x79\x8c\x01\x93\xc0\x31\x37\x5b\x97\xa3\xc1\xe7\x0f"
        "\x07\x61\xea\x22\x14\xfd\x22\x2d\xf6\x17\x7e\xa2\xc3\x0c\x6e\x72\xa4"
        "\xf2\xd4\xad\xcd\x2c\x70\x1f\x35\xde\xb4\x76\x37\xfe\x21\xfd\xd3\xfc"
        "\x44\x0a\x83\xeb\xcd\x93\x00\xfd\x70\x4c\xd9\xd3\x11\x1c\xfb\x49\x84"
        "\xb2\x78\x69\x85\x50\xff\x3b\xf3\xaf\x94\xa0\xac\xed\x94\xcb\x50\x61"
        "\xc7\x2c\x45\x47\xc8\xee\xc3\xa0\xf5\x35\x3e\x54\x13\x09\x79\x40\x10"
        "\x5f\xe4\x3c\x2c\x94\x8c\xd4\xfa\xed\x18\xbd\x33\xd6\xc8\x26\xd2\x32"
        "\x63\x48\x2e\x9b\x73\x34\x1f\x43\xd0\x50\x87\x9c\x41\xd6\x23\xd0\x27"
        "\xfb\x4f\xaf\x5a\x42\x28\x2d\x8f\x2f\xa9\x63\x7d\xe7\xa5\x0a\xc0\x22"
        "\xd8\x9b\x54\x76\xa0\x5e\xf6\x05\x84\xda\xfd\xfa\xea\x52\x8b\x9c\x3b"
        "\xfa\x9e\xc4\x9e\x9b\x4d\xbb\xe7\x74\xc2\x6f\x25\xdc\x5b\x81\x6c\xd0"
        "\xbb\xea\x83\xab\xc7\x6e\x8d\x78\xeb\x5c\x96\x01\xb0\x7e\xcb\x49\x57"
        "\x6e\x59\x64\x8e\x23\x43\xde\x76\xed\xf5\x92\x69\xc6\x1c\x02\x05\xb0"
        "\xb1\x82\xf1\xc3\x80\x0c\xa7\x48\xcb\x75\xe7\x25\x4d\x73\x77\x50\x36"
        "\x2f\x40\x02\x99\x85\x47\xee\x9c\x55\x9d\xea\x70\xdf\x1d\x69\x82\x65"
        "\x25\xdc\xd8\x00\xd4\x5f\x8e\x81\xbb\x52\x96\x85\xbc\xc2\xe2\x3a\x15"
        "\xe6\x2d\xe3\x71\xae\x5f\x2e\x0b\x91\x04\x84\xbd\x4c\xba\xad\xdc\x1c"
        "\xa5\x0c\xcf\xd1\x95\x1d\x9d\x05\xf0\x77\x71\xca\x71\x87\x3d\x14\x93"
        "\xd5\x2c\x30\xe4\x32\x83\x3f\x0d\x81\x61\xc9\xb6\xf4\x1c\x35\xc0\xd7"
        "\x67\x4d\x1b\xf7\xa1\x25\x44\xbb\xe6\x1a\x77\x18\x8b\x4b\xcf\x3e\xa5"
        "\x43\x76\x85\x2e\x79\xe9\xf8\xa1\xee\x2d\xb5\x1b\xe1\xc2\xed\x8e\xf5"
        "\x15\x37\x98\xd2\x10\x06\x98\x92\x87\x55\xbe\xf3\x0e\xce\x87\x9e\x9e"
        "\xd5\x30\xc4\xac\xac\x41\xe9\x81\x85\x0b\x6b\x65\x2a\x4a\x0f\x39\xc8"
        "\xca\xa2\xc0\xe1\x27\x54\x4f\xa1\xf5\x9e\x58\x39\x2e\x99\xd4\x87\x31"
        "\x1e\xd7\xaf\x53\x28\xec\xb8\x3f\x82\x30\x39\xe1\x03\xf7\xfe\xbe\x52"
        "\xc1\x28\x8d\x10\x2d\x75\x3a\x4b\x7c\xea\xde\xc6\x88\x4c\x85\x89\x82"
        "\x86\x1c\xf5\xa6\xb5\x87\x08\x14\x2b\xa0\xcf\x41\x7c\xf2\xc8\x8d\xb6"
        "\xe0\x5f\xb2\xd6\x99\x47\x08\xa0\x1a\x23\x66\x5c\x96\xcb\x34\xe5\x9f"
        "\xd9\x37\x5b\x31\x5a\x72\xcd\x6c\xa5\xe0\x62\x1a\xae\xae\x98\x32\x1f"
        "\x18\x16\xd2\xd9\xd3\x3f\xc7\x5f\xb1\x68\xfc\xc1\x26\x2b\x9f\x83\x30"
        "\x69\x36\x1f\x2e\x68\xe0\xc1\xce\xa3\x5f\xd8\x2e\xc0\x64\xa3\x85\x85"
        "\x11\x01\x74\x08\xf6\xb8\x6c\x5b\x2e\x53\x8a\x16\xd4\x60\x26\x6c\xf5"
        "\x33\x51\x94\xca\x6d\x4b\xbe\x0e\xaa\xe6\x47\x9a\x0c\xb5\xde\xe2\xd3"
        "\xab\xaf\x99\xf5\x7d\x9e\x1f\x29\xa3\x88\x8d\xd4\xcf\xb4\xc6\xe1\x09"
        "\xa2\x88\x49\xf2\x6f\xea\x37\x52\x9f\xf9\xcc\xcd\xb7\x86\xb2\x2a\x81"
        "\xaa\xb0\x1e\xdc\x99\xf8\xc4\x96\xf1\x16\x3a\xef\x91\x42\x3d\x81\xb8"
        "\x31\x44\x0a\x45\x5f\xb0\x45\x90\x45\xaf\x15\xc4\x23\x43\xac\x0f\xa2"
        "\xf3\x37\x65\x8f\xe9\x8e\xa8\x5b\x9f\xf6\xc7\x62\xe5\xe2\x7c\x54\xca"
        "\x0f\xf4\x66\xa2\x61\x23\x78\xe8\xa3\x82\xde\x67\xaa\x34\xce\xfa\x07"
        "\x5b\xcb\xa0\x30\x2d\x01\x28\x61\xbd\xf1\xe7\xdc\xec\xa6\x02\x5a\xd7"
        "\x30\x5a\xcb\x5f\xe8\xc9\x98\xa6\xd4\x4d\x81\x9a\xa9\x30\x3d\x45\x87"
        "\x41\x84\xc9\x82\x45\x6b\xc9\x4e\x55\xf5\x2a\xee\x26\x6c\x88\xb2\x1e"
        "\x0e\x5a\x16\xe3\xbe\x72\xba\xdf\xdc\x52\x73\x01\xa4\xc5\x21\x63\x00"
        "\xeb\xff\xa2\x83\x26\x20\xe4\x4a\x76\x3d\xf4\x8e\x57\xe5\x7a\x8e\x27"
        "\xc7\x06\xc6\x8a\xda\xbd\xf0\xb4\x11\xb0\xa0\x84\xf2\x4a\x03\x0e\xd3"
        "\x7e\x0f\x1b\x56\xb4\xd1\x39\xb1\xb2\x3d\x05\x37\xbb\xc4\xf0\x3d\x1f"
        "\x7e\x25\x1d\x93\xf1\xd8\x06\x9d\x29\x24\xcc\xa9\xe9\xaa\xe8\x4f\x4c"
        "\xf3\x9e\x7a\x60\x65\x8c\xba\x1d\xda\xfa\x9c\xe2\x84\x2e\xc5\xb5\x8f"
        "\x39\x12\xc7\x82\xc0\x00\xb5\x84\x2b\xac\xeb\xf8\x4c\x8e\xa6\xa1\x62"
        "\xe0\x53\xf7\x64\x6a\x65\xc3\x6c\x9d\x1a\xd9\xc3\x04\x10\xb7\x60\x66"
        "\x51\x91\x25\x9f\x8f\x5a\x5a\x17\x70\x08\x7b\x31\xf3\x93\x5e\xb2\xff"
        "\xe0\x38\x32\xda\x2f\x30\x7e\x81\x59\xd3\x51\x4f\xd6\xbf\x26\xaf\x2f"
        "\x18\x60\x4f\x9b\x49\xe3\x6d\x91\x4a\xf3\x8c\x31\x6a\x30\x12\x7d\xa5"
        "\xc0\x90\x3d\x56\x06\x5b\x59\x1a\xe2\xdd\x0a\x5b\x37\x12\x13\x61\x87"
        "\x4e\x4e\x02\xe7\x04\x2a\xd9\x6c\x04\xd9\x43\xb6\xce\xf7\x50\xc6\x9b"
        "\x2d\xa0\x86\x86\x4a\xa4\x1a\xb3\xad\x8d\x30\x8c\x20\x62\x2c\x31\xd3"
        "\xc1\x29\xfb\xba\x8c\x9e\xe5\x7a\x69\xc2\xdc\x77\xaf\xe1\xc8\x0f\x55"
        "\x8d\xd9\x17\x51\xd8\x04\x5f\xd8\x1d\xdc\x93\xc9\xc4\x57\x30\x35\x5e"
        "\x5f\xf8\xdc\x9c\xef\x29\xd8\xe4\x2a\xec\x8c\x3b\xcb\x47\x85\x02\x8b"
        "\x54\x3a\xa0\x98\x21\x7f\x5a\x12\xe3\x4a\xc5\x26\xac\x2f\x95\xce\xb7"
        "\x14\x80\x46\x49\xbb\x13\x9f\xf3\xac\x0f\x6e\xf3\x46\x1a\xd7\x13\x3c"
        "\x48\xb8\x5b\x97\x41\x92\x97\xc1\xfe\x37\xc6\x87\xbe\xd8\xb9\x96\xf3"
        "\xa6\x87\x39\x49\x33\xc0\x19\x83\x8f\xf1\xb1\x83\x89\x48\x5d\xbf\xe9"
        "\x94\xfc\x3e\x95\x84\xcb\xe8\x50\xe8\x0f\xdf\x3c\xbc\xbb\x89\xf6\x0f"
        "\x02\x06\x7e\x6d\x62\x22\x1a\x63\x33\xc3\xdf\x0b\x11\x62\x61\x80\x75"
        "\xa2\xa7\xb2\xa9\xcd\x67\x27\xe9\x98\x3c\x9e\x0a\x2d\x3a\x30\xe6\xc8"
        "\x47\x13\x5f\xc8\xfe\x67\x88\x1b\x7c\x14\x8e\x01\x43\xf5\x08\x66\xa8"
        "\xb7\x4d\x94\x60\x2e\xba\x46\x53\xe2\x7f\x40\x47\x82\x27\x54\xf0\x1c"
        "\x7b\xd6\x6e\xfa\x82\x91\x7e\x7a\x47\x29\xd5\x5f\xdd\x19\xc9\x08\xfb"
        "\x43\xdf\xb9\xe0\xdf\x94\x30\x29\xcf\xa9\xbe\x14\xfe\xc0\x5c\x05\xd1"
        "\x71\x85\xa1\xa1\xe1\xd0\xf8\x91\xf2\xb6\x04\xc4\x60\x7f\x16\x2d\x60"
        "\x93\xf1\x36\x77\x9d\x85\x94\xac\xf5\xeb\x0f\xe8\xbe\x64\x6c\x72\x90"
        "\x83\x06\xb9\x40\x6a\xa1\x63\x08\xbd\x15\xd1\x7e\x6a\xe7\x47\x57\xf9"
        "\xe4\x36\x34\xb7\x47\xa0\x67\x44\xba\x99\x31\x5e\xd8\xb9\xbd\xd3\x97"
        "\x81\xd7\xe0\x80\x1e\xce\x91\x82\x19\xf8\xe6\x93\x97\x96\xe7\xb5\x30"
        "\x8d\x7d\x9c\x5e\x8a\x08\x5b\x46\xb9\xe6\xa4\x9d\x56\x07\xfb\xf4\xb6"
        "\x80\xac\x27\x1b\x97\x3d\xad\x48\x23\xea\x55\xf5\x34\xca\xe4\x5a\x59"
        "\xa7\x12\x06\xb0\x8c\x6c\x81\xbe\x2e\x87\xe9\xe4\x96\x19\xef\x9d\x55"
        "\x66\x60\x66\x16\x9b\xa6\xc1\xbd\x48\xb1\x55\xb1\x6e\x89\xeb\xe0\xe5"
        "\x0a\x78\x46\xb5\xd3\x78\x59\x40\x36\x62\x9e\x07\x04\xc3\x82\x14\xd1"
        "\xcc\xf2\xbb\x90\x1d\x02\xa6\x0c\xae\x36\xd2\xb2\x89\x20\x7e\xb8\x34"
        "\x46\xdc\x59\x65\xe6\xd2\x9e\xe2\xae\x88\x7a\xbd\x88\x53\x58\xc3\xd7"
        "\xa1\x4d\xb1\x89\xec\xcb\x10\x72\xc5\x65\x63\xdb\xf4\xe1\x6f\x69\xcb"
        "\x35\x72\x6a\x6f\x5a\xca\x9c\xcb\x81\xa7\x34\xd0\x80\x94\xef\xd6\xb0"
        "\x1d\x30\x5b\x99\xa7\x6d\x8a\xca\x09\xee\xca\x38\x3f\x31\x11\x2e\x72"
        "\x60\x07\x4c\x57\xfb\xb8\x58\x34\x3a\x86\x09\x24\x66\x90\xe5\xfb\x94"
        "\x2b\xcc\x9d\x11\xaa\x5c\x02\xec\x25\x50\x69\x03\xa5\x99\xb1\xf1\x5c"
        "\x90\x12\x73\x8f\x4b\xee\xd5\x6a\x6c\x1c\x9a\x3e\x01\x1e\xb4\x08\xbb"
        "\x74\xf1\x98\x04\x33\xf6\xd3\xcd\x38\xd0\x93\x77\x3f\xfa\x25\x9d\x5e"
        "\x55\x3e\x50\x17\x94\x51\xfc\x9f\x57\xce\xfa\xb9\xac\x26\xbb\xa5\xd7"
        "\xc2\x5b\x43\xe4\x59\x61\x84\x60\x7a\x6a\xbe\x81\xc1\x37\x1d\x6d\x00"
        "\xd5\xa8\x30\x4a\xeb\xba\x95\x7c\xa9\xe5\x17\x77\x5e\x80\x02\xb5\x80"
        "\x54\x66\x27\x90\xdd\x73\xb4\x5d\x29\xeb\xfa\xab\x83\x0d\xe2\x35\x33"
        "\x5d\x06\xea\x23\x8d\x20\x35\x46\x15\x5e\xbc\x48\x44\x8e\xf5\x8b\x8c"
        "\x7f\x3e\x44\x91\x02\x27\xe2\x8d\x05\xcd\xb3\xe0\x06\xa9\x29\x84\x02"
        "\x64\x64\x8b\x2a\xff\x98\x9e\x06\x6f\xcb\x31\x55\x1b\x85\x0a\xcc\xd0"
        "\xe4\x6b\xe5\x68\xa0\x8c\xf5\xec\x27\x85\x4a\x0e\xfb\x42\x7b\x15\xf9"
        "\xc7\xde\x9e\x57\x9c\xad\x59\x5c\xbb\x68\x1f\x6e\x64\x0f\x8c\xa1\xf7"
        "\x97\xba\xd1\x40\x7a\x9e\x4e\x9a\xba\x23\x24\x4d\x6f\xf1\x20\x05\xed"
        "\x97\x1d\xc2\x52\x7f\x3a\x07\x58\x87\x0a\x9e\x43\xd2\x87\x13\x5c\x38"
        "\xd3\x37\x94\x8e\x5d\x86\x78\x9b\x2d\x6a\x6e\x3f\xda\xe7\xe4\xba\xfb"
        "\xda\x87\xf1\xe4\x93\x9a\xc2\x85\x6e\x6a\x6d\xd2\x6c\x7a\xf0\xad\xfa"
        "\xfc\xb4\xe7\x19\x25\x38\x5e\x45\xe1\x2e\xb7\x11\xbb\xf2\x2e\x12\x1f"
        "\x16\xd6\x65\x55\x0f\x8b\x35\x58\x92\xc0\x0c\xb6\xba\xd7\x8c\xaf\x8a"
        "\x4d\xf2\x6c\xdf\x2d\x09\x55\xb1\xe7\x02\xd8\x8e\xba\x1f\xb4\x05\x7c"
        "\xf2\x85\x67\x1f\xc1\x52\x66\xfa\x5f\xb3\xd3\xcb\x2a\x32\xc8\x5d\x86"
        "\xa8\xbb\xed\x36\x9b\x5e\x26\xe5\xdf\x91\x97\x1e\x15\xb3\x6e\x95\x0b"
        "\x86\x69\x55\x26\x35\xfb\xa2\x53\xe1\x16\x57\xa8\xfb\x65\x3a\x43\x1f"
        "\x22\xb7\x6f\xe5\xa6\xaf\xf2\x1e\x45\x70\x43\xf3\x8f\xba\x42\x99\x7c"
        "\xd3\xc5\x4b\xa5\xbd\xbe\x7f\x0d\xff\xd2\x31\x54\xca\x1b\x6f\x76\xa9"
        "\x5b\x10\xc0\x5e\x89\xe9\xbb\x79\x24\xec\x83\xe3\x6e\x83\x46\x87\x0e"
        "\x0b\xc0\xab\x44\x10\xa4\x36\xf5\x0d\x6a\xbf\xe7\xd6\xc8\xac\x25\x63"
        "\x0d\x92\xb4\x08\x52\xf5\x81\x2a\xb7\x0c\xe0\xa3\xb6\x0e\x49\x2b",
        4096));
    syscall(__NR_getsockopt, r[0], 0x84, 0x6d, 0x20001100, 0);
    break;
  case 3:
    syscall(__NR_socket, 0xa, 5, 0);
    break;
  case 4:
    NONFAILING(memcpy((void*)0x20000040, "./file0", 8));
    syscall(__NR_mknodat, -1, 0x20000040, 0xf80c, -1);
    break;
  case 5:
    syscall(__NR_socket, 0xa, 0xa, 1);
    break;
  case 6:
    syscall(__NR_socket, 0x10, 3, 0);
    break;
  case 7:
    NONFAILING(*(uint32_t*)0x20000080 = -1);
    NONFAILING(*(uint32_t*)0x20000084 = 7);
    NONFAILING(*(uint32_t*)0x20000088 = 0x10);
    syscall(__NR_bpf, 0xe, 0x20000080, 0xc);
    break;
  }
}
int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  install_segv_handler();
  for (procid = 0; procid < 6; procid++) {
    if (fork() == 0) {
      use_temporary_dir();
      do_sandbox_namespace();
    }
  }
  sleep(1000000);
  return 0;
}