// https://syzkaller.appspot.com/bug?id=4acb2aa300d1adc7695b387fb986b9ef00680908
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <arpa/inet.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <net/if.h>
#include <netinet/in.h>
#include <sched.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.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/wait.h>
#include <unistd.h>

#include <linux/capability.h>
#include <linux/genetlink.h>
#include <linux/if_addr.h>
#include <linux/if_link.h>
#include <linux/in6.h>
#include <linux/neighbour.h>
#include <linux/net.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <linux/veth.h>

#define BITMASK(bf_off, bf_len) (((1ull << (bf_len)) - 1) << (bf_off))
#define STORE_BY_BITMASK(type, htobe, addr, val, bf_off, bf_len)               \
  *(type*)(addr) =                                                             \
      htobe((htobe(*(type*)(addr)) & ~BITMASK((bf_off), (bf_len))) |           \
            (((type)(val) << (bf_off)) & BITMASK((bf_off), (bf_len))))

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;
}

struct nlmsg {
  char* pos;
  int nesting;
  struct nlattr* nested[8];
  char buf[4096];
};

static void netlink_init(struct nlmsg* nlmsg, int typ, int flags,
                         const void* data, int size)
{
  memset(nlmsg, 0, sizeof(*nlmsg));
  struct nlmsghdr* hdr = (struct nlmsghdr*)nlmsg->buf;
  hdr->nlmsg_type = typ;
  hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | flags;
  memcpy(hdr + 1, data, size);
  nlmsg->pos = (char*)(hdr + 1) + NLMSG_ALIGN(size);
}

static void netlink_attr(struct nlmsg* nlmsg, int typ, const void* data,
                         int size)
{
  struct nlattr* attr = (struct nlattr*)nlmsg->pos;
  attr->nla_len = sizeof(*attr) + size;
  attr->nla_type = typ;
  if (size > 0)
    memcpy(attr + 1, data, size);
  nlmsg->pos += NLMSG_ALIGN(attr->nla_len);
}

static int netlink_send_ext(struct nlmsg* nlmsg, int sock, uint16_t reply_type,
                            int* reply_len, bool dofail)
{
  if (nlmsg->pos > nlmsg->buf + sizeof(nlmsg->buf) || nlmsg->nesting)
    exit(1);
  struct nlmsghdr* hdr = (struct nlmsghdr*)nlmsg->buf;
  hdr->nlmsg_len = nlmsg->pos - nlmsg->buf;
  struct sockaddr_nl addr;
  memset(&addr, 0, sizeof(addr));
  addr.nl_family = AF_NETLINK;
  ssize_t n = sendto(sock, nlmsg->buf, hdr->nlmsg_len, 0,
                     (struct sockaddr*)&addr, sizeof(addr));
  if (n != (ssize_t)hdr->nlmsg_len) {
    if (dofail)
      exit(1);
    return -1;
  }
  n = recv(sock, nlmsg->buf, sizeof(nlmsg->buf), 0);
  if (reply_len)
    *reply_len = 0;
  if (n < 0) {
    if (dofail)
      exit(1);
    return -1;
  }
  if (n < (ssize_t)sizeof(struct nlmsghdr)) {
    errno = EINVAL;
    if (dofail)
      exit(1);
    return -1;
  }
  if (hdr->nlmsg_type == NLMSG_DONE)
    return 0;
  if (reply_len && hdr->nlmsg_type == reply_type) {
    *reply_len = n;
    return 0;
  }
  if (n < (ssize_t)(sizeof(struct nlmsghdr) + sizeof(struct nlmsgerr))) {
    errno = EINVAL;
    if (dofail)
      exit(1);
    return -1;
  }
  if (hdr->nlmsg_type != NLMSG_ERROR) {
    errno = EINVAL;
    if (dofail)
      exit(1);
    return -1;
  }
  errno = -((struct nlmsgerr*)(hdr + 1))->error;
  return -errno;
}

static int netlink_query_family_id(struct nlmsg* nlmsg, int sock,
                                   const char* family_name, bool dofail)
{
  struct genlmsghdr genlhdr;
  memset(&genlhdr, 0, sizeof(genlhdr));
  genlhdr.cmd = CTRL_CMD_GETFAMILY;
  netlink_init(nlmsg, GENL_ID_CTRL, 0, &genlhdr, sizeof(genlhdr));
  netlink_attr(nlmsg, CTRL_ATTR_FAMILY_NAME, family_name,
               strnlen(family_name, GENL_NAMSIZ - 1) + 1);
  int n = 0;
  int err = netlink_send_ext(nlmsg, sock, GENL_ID_CTRL, &n, dofail);
  if (err < 0) {
    return -1;
  }
  uint16_t id = 0;
  struct nlattr* attr = (struct nlattr*)(nlmsg->buf + NLMSG_HDRLEN +
                                         NLMSG_ALIGN(sizeof(genlhdr)));
  for (; (char*)attr < nlmsg->buf + n;
       attr = (struct nlattr*)((char*)attr + NLMSG_ALIGN(attr->nla_len))) {
    if (attr->nla_type == CTRL_ATTR_FAMILY_ID) {
      id = *(uint16_t*)(attr + 1);
      break;
    }
  }
  if (!id) {
    errno = EINVAL;
    return -1;
  }
  recv(sock, nlmsg->buf, sizeof(nlmsg->buf), 0);
  return id;
}

static long syz_genetlink_get_family_id(volatile long name,
                                        volatile long sock_arg)
{
  int fd = sock_arg;
  if (fd < 0) {
    fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC);
    if (fd == -1) {
      return -1;
    }
  }
  struct nlmsg nlmsg_tmp;
  int ret = netlink_query_family_id(&nlmsg_tmp, fd, (char*)name, false);
  if ((int)sock_arg < 0)
    close(fd);
  if (ret < 0) {
    return -1;
  }
  return ret;
}

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

static void setup_binderfs()
{
  if (mkdir("/dev/binderfs", 0777)) {
  }
  if (mount("binder", "/dev/binderfs", "binder", 0, NULL)) {
  }
  if (symlink("/dev/binderfs", "./binderfs")) {
  }
}

static void loop();

static void sandbox_common()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  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 (mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, NULL)) {
  }
  if (unshare(CLONE_NEWIPC)) {
  }
  if (unshare(0x02000000)) {
  }
  if (unshare(CLONE_NEWUTS)) {
  }
  if (unshare(CLONE_SYSVSEM)) {
  }
  typedef struct {
    const char* name;
    const char* value;
  } sysctl_t;
  static const sysctl_t sysctls[] = {
      {"/proc/sys/kernel/shmmax", "16777216"},
      {"/proc/sys/kernel/shmall", "536870912"},
      {"/proc/sys/kernel/shmmni", "1024"},
      {"/proc/sys/kernel/msgmax", "8192"},
      {"/proc/sys/kernel/msgmni", "1024"},
      {"/proc/sys/kernel/msgmnb", "1024"},
      {"/proc/sys/kernel/sem", "1024 1048576 500 1024"},
  };
  unsigned i;
  for (i = 0; i < sizeof(sysctls) / sizeof(sysctls[0]); i++)
    write_file(sysctls[i].name, sysctls[i].value);
}

static int wait_for_loop(int pid)
{
  if (pid < 0)
    exit(1);
  int status = 0;
  while (waitpid(-1, &status, __WALL) != pid) {
  }
  return WEXITSTATUS(status);
}

static void drop_caps(void)
{
  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);
  const int drop = (1 << CAP_SYS_PTRACE) | (1 << CAP_SYS_NICE);
  cap_data[0].effective &= ~drop;
  cap_data[0].permitted &= ~drop;
  cap_data[0].inheritable &= ~drop;
  if (syscall(SYS_capset, &cap_hdr, &cap_data))
    exit(1);
}

static int do_sandbox_none(void)
{
  if (unshare(CLONE_NEWPID)) {
  }
  int pid = fork();
  if (pid != 0)
    return wait_for_loop(pid);
  setup_common();
  sandbox_common();
  drop_caps();
  if (unshare(CLONE_NEWNET)) {
  }
  write_file("/proc/sys/net/ipv4/ping_group_range", "0 65535");
  setup_binderfs();
  loop();
  exit(1);
}

uint64_t r[4] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff,
                 0x0};

void loop(void)
{
  intptr_t res = 0;
  res = syscall(__NR_socket, 0x10ul, 3ul, 0);
  if (res != -1)
    r[0] = res;
  res = syscall(__NR_socket, 0x10ul, 3ul, 0);
  if (res != -1)
    r[1] = res;
  res = syscall(__NR_socket, 0x10ul, 0x803ul, 0);
  if (res != -1)
    r[2] = res;
  memcpy((void*)0x200000c0, "mptcp_pm\000", 9);
  syz_genetlink_get_family_id(0x200000c0, r[2]);
  *(uint32_t*)0x20000080 = 0x14;
  res = syscall(__NR_getsockname, r[2], 0x20000100ul, 0x20000080ul);
  if (res != -1)
    r[3] = *(uint32_t*)0x20000104;
  *(uint64_t*)0x20005840 = 0;
  *(uint32_t*)0x20005848 = 0;
  *(uint64_t*)0x20005850 = 0x200005c0;
  *(uint64_t*)0x200005c0 = 0x20001240;
  *(uint32_t*)0x20001240 = 0x48;
  *(uint16_t*)0x20001244 = 0x24;
  *(uint16_t*)0x20001246 = 0x8651;
  *(uint32_t*)0x20001248 = 0;
  *(uint32_t*)0x2000124c = 0;
  *(uint8_t*)0x20001250 = 0;
  *(uint8_t*)0x20001251 = 0;
  *(uint16_t*)0x20001252 = 0;
  *(uint32_t*)0x20001254 = r[3];
  *(uint16_t*)0x20001258 = 0;
  *(uint16_t*)0x2000125a = 0;
  *(uint16_t*)0x2000125c = -1;
  *(uint16_t*)0x2000125e = -1;
  *(uint16_t*)0x20001260 = 0;
  *(uint16_t*)0x20001262 = 0;
  *(uint16_t*)0x20001264 = 8;
  *(uint16_t*)0x20001266 = 1;
  memcpy((void*)0x20001268, "htb\000", 4);
  *(uint16_t*)0x2000126c = 0x1c;
  *(uint16_t*)0x2000126e = 2;
  *(uint16_t*)0x20001270 = 0x18;
  *(uint16_t*)0x20001272 = 2;
  *(uint32_t*)0x20001274 = 3;
  *(uint32_t*)0x20001278 = 0;
  *(uint32_t*)0x2000127c = 0;
  *(uint32_t*)0x20001280 = 0;
  *(uint32_t*)0x20001284 = 0;
  *(uint64_t*)0x200005c8 = 0x48;
  *(uint64_t*)0x20005858 = 1;
  *(uint64_t*)0x20005860 = 0;
  *(uint64_t*)0x20005868 = 0;
  *(uint32_t*)0x20005870 = 0;
  syscall(__NR_sendmsg, r[1], 0x20005840ul, 0ul);
  *(uint64_t*)0x20000140 = 0;
  *(uint32_t*)0x20000148 = 0;
  *(uint64_t*)0x20000150 = 0x20000180;
  *(uint64_t*)0x20000180 = 0x20000ac0;
  *(uint32_t*)0x20000ac0 = 0x70;
  *(uint16_t*)0x20000ac4 = 0x2c;
  *(uint16_t*)0x20000ac6 = 0xd27;
  *(uint32_t*)0x20000ac8 = 0;
  *(uint32_t*)0x20000acc = 0;
  *(uint8_t*)0x20000ad0 = 0;
  *(uint8_t*)0x20000ad1 = 0;
  *(uint16_t*)0x20000ad2 = 0;
  *(uint32_t*)0x20000ad4 = r[3];
  *(uint16_t*)0x20000ad8 = 0;
  *(uint16_t*)0x20000ada = 0;
  *(uint16_t*)0x20000adc = 0;
  *(uint16_t*)0x20000ade = 0;
  *(uint16_t*)0x20000ae0 = 2;
  *(uint16_t*)0x20000ae2 = 0;
  *(uint16_t*)0x20000ae4 = 0xa;
  *(uint16_t*)0x20000ae6 = 1;
  memcpy((void*)0x20000ae8, "basic\000", 6);
  *(uint16_t*)0x20000af0 = 0x40;
  *(uint16_t*)0x20000af2 = 2;
  *(uint16_t*)0x20000af4 = 0x3c;
  STORE_BY_BITMASK(uint16_t, , 0x20000af6, 2, 0, 14);
  STORE_BY_BITMASK(uint16_t, , 0x20000af7, 0, 6, 1);
  STORE_BY_BITMASK(uint16_t, , 0x20000af7, 1, 7, 1);
  *(uint16_t*)0x20000af8 = 0x30;
  STORE_BY_BITMASK(uint16_t, , 0x20000afa, 2, 0, 14);
  STORE_BY_BITMASK(uint16_t, , 0x20000afb, 0, 6, 1);
  STORE_BY_BITMASK(uint16_t, , 0x20000afb, 1, 7, 1);
  *(uint16_t*)0x20000afc = 0x2c;
  STORE_BY_BITMASK(uint16_t, , 0x20000afe, 1, 0, 14);
  STORE_BY_BITMASK(uint16_t, , 0x20000aff, 0, 6, 1);
  STORE_BY_BITMASK(uint16_t, , 0x20000aff, 0, 7, 1);
  *(uint16_t*)0x20000b00 = 0;
  *(uint16_t*)0x20000b02 = 9;
  *(uint16_t*)0x20000b04 = 0;
  *(uint16_t*)0x20000b06 = 0;
  *(uint16_t*)0x20000b08 = 8;
  *(uint16_t*)0x20000b0a = 1;
  *(uint32_t*)0x20000b0c = 0;
  *(uint16_t*)0x20000b10 = 5;
  *(uint16_t*)0x20000b12 = 4;
  *(uint8_t*)0x20000b14 = 0xe;
  *(uint16_t*)0x20000b18 = 0xb;
  *(uint16_t*)0x20000b1a = 2;
  memcpy((void*)0x20000b1c, "policy\000", 7);
  *(uint16_t*)0x20000b24 = 4;
  *(uint16_t*)0x20000b26 = 5;
  *(uint16_t*)0x20000b28 = 8;
  *(uint16_t*)0x20000b2a = 1;
  *(uint16_t*)0x20000b2c = 2;
  *(uint16_t*)0x20000b2e = 0;
  *(uint64_t*)0x20000188 = 0x70;
  *(uint64_t*)0x20000158 = 1;
  *(uint64_t*)0x20000160 = 0;
  *(uint64_t*)0x20000168 = 0;
  *(uint32_t*)0x20000170 = 0;
  syscall(__NR_sendmsg, r[0], 0x20000140ul, 0ul);
}
int main(void)
{
  syscall(__NR_mmap, 0x1ffff000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
  do_sandbox_none();
  return 0;
}