// https://syzkaller.appspot.com/bug?id=80ffd087a886df22d21a44af2c6809a5d3ff2d9b
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <errno.h>
#include <fcntl.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/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>

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;
}

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 = 128 << 20;
  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[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0x0};

void loop(void)
{
  intptr_t res = 0;
  res = syscall(__NR_socket, /*domain=*/0x10ul, /*type=*/3ul, /*proto=*/0);
  if (res != -1)
    r[0] = res;
  res = syscall(__NR_socket, /*domain=*/0x10ul, /*type=*/0x803ul, /*proto=*/0);
  if (res != -1)
    r[1] = res;
  *(uint64_t*)0x200004c0 = 0;
  *(uint32_t*)0x200004c8 = 0;
  *(uint64_t*)0x200004d0 = 0x20000480;
  *(uint64_t*)0x20000480 = 0;
  *(uint64_t*)0x20000488 = 0x92;
  *(uint64_t*)0x200004d8 = 1;
  *(uint64_t*)0x200004e0 = 0;
  *(uint64_t*)0x200004e8 = 0;
  *(uint32_t*)0x200004f0 = 0;
  syscall(__NR_sendmsg, /*fd=*/r[1], /*msg=*/0x200004c0ul, /*f=*/0ul);
  *(uint32_t*)0x20000200 = 0x14;
  res = syscall(__NR_getsockname, /*fd=*/r[1], /*addr=*/0x20000100ul,
                /*addrlen=*/0x20000200ul);
  if (res != -1)
    r[2] = *(uint32_t*)0x20000104;
  *(uint64_t*)0x200007c0 = 0;
  *(uint32_t*)0x200007c8 = 0;
  *(uint64_t*)0x200007d0 = 0x200000c0;
  *(uint64_t*)0x200000c0 = 0x200002c0;
  *(uint32_t*)0x200002c0 = 0x74;
  *(uint16_t*)0x200002c4 = 0x24;
  *(uint16_t*)0x200002c6 = 0xe0b;
  *(uint32_t*)0x200002c8 = 0;
  *(uint32_t*)0x200002cc = 0;
  *(uint8_t*)0x200002d0 = 0;
  *(uint8_t*)0x200002d1 = 0;
  *(uint16_t*)0x200002d2 = 0;
  *(uint32_t*)0x200002d4 = r[2];
  *(uint16_t*)0x200002d8 = 0;
  *(uint16_t*)0x200002da = 0;
  *(uint16_t*)0x200002dc = -1;
  *(uint16_t*)0x200002de = -1;
  *(uint16_t*)0x200002e0 = 0;
  *(uint16_t*)0x200002e2 = 0;
  *(uint16_t*)0x200002e4 = 0xa;
  *(uint16_t*)0x200002e6 = 1;
  memcpy((void*)0x200002e8, "netem\000", 6);
  *(uint16_t*)0x200002f0 = 0x44;
  *(uint16_t*)0x200002f2 = 2;
  *(uint32_t*)0x200002f4 = 0;
  *(uint32_t*)0x200002f8 = 3;
  *(uint32_t*)0x200002fc = 0;
  *(uint32_t*)0x20000300 = 0;
  *(uint32_t*)0x20000304 = 0;
  *(uint32_t*)0x20000308 = 8;
  *(uint16_t*)0x2000030c = 6;
  *(uint16_t*)0x2000030e = 2;
  memcpy((void*)0x20000310, "\x10\x8a", 2);
  *(uint16_t*)0x20000314 = 0xc;
  *(uint16_t*)0x20000316 = 8;
  *(uint64_t*)0x20000318 = 0xccc733220b29ffc5;
  *(uint16_t*)0x20000320 = 0x14;
  *(uint16_t*)0x20000322 = 6;
  *(uint32_t*)0x20000324 = 0;
  *(uint32_t*)0x20000328 = 0;
  *(uint32_t*)0x2000032c = 0x200;
  *(uint32_t*)0x20000330 = 0;
  *(uint64_t*)0x200000c8 = 0x74;
  *(uint64_t*)0x200007d8 = 1;
  *(uint64_t*)0x200007e0 = 0;
  *(uint64_t*)0x200007e8 = 0;
  *(uint32_t*)0x200007f0 = 0;
  syscall(__NR_sendmsg, /*fd=*/r[0], /*msg=*/0x200007c0ul, /*f=*/0ul);
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul, /*prot=*/7ul,
          /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
  do_sandbox_none();
  return 0;
}