// https://syzkaller.appspot.com/bug?id=601bbf0903e004c31e34feaba541b625a7bd3cf6
// 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>

#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;
}

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

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 (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)) {
  }
  loop();
  exit(1);
}

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

void loop(void)
{
  intptr_t res = 0;
  *(uint64_t*)0x20000180 = 0;
  *(uint32_t*)0x20000188 = 0;
  *(uint64_t*)0x20000190 = 0x200000c0;
  *(uint64_t*)0x200000c0 = 0;
  *(uint64_t*)0x200000c8 = 0x34;
  *(uint64_t*)0x20000198 = 1;
  *(uint64_t*)0x200001a0 = 0;
  *(uint64_t*)0x200001a8 = 0;
  *(uint32_t*)0x200001b0 = 0;
  syscall(__NR_sendmsg, -1, 0x20000180ul, 0ul);
  res = syscall(__NR_socket, 0x4000000000010ul, 0x1000000000080002ul, 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;
  *(uint64_t*)0x200001c0 = 0;
  *(uint32_t*)0x200001c8 = 0;
  *(uint64_t*)0x200001d0 = 0x20000180;
  *(uint64_t*)0x20000180 = 0;
  *(uint64_t*)0x20000188 = 0;
  *(uint64_t*)0x200001d8 = 1;
  *(uint64_t*)0x200001e0 = 0;
  *(uint64_t*)0x200001e8 = 0;
  *(uint32_t*)0x200001f0 = 0;
  syscall(__NR_sendmsg, r[2], 0x200001c0ul, 0ul);
  *(uint32_t*)0x20000200 = 0x14;
  res = syscall(__NR_getsockname, r[2], 0x20000100ul, 0x20000200ul);
  if (res != -1)
    r[3] = *(uint32_t*)0x20000104;
  syscall(__NR_sendmsg, r[1], 0ul, 0ul);
  *(uint64_t*)0x200007c0 = 0;
  *(uint32_t*)0x200007c8 = 0;
  *(uint64_t*)0x200007d0 = 0x200000c0;
  *(uint64_t*)0x200000c0 = 0x20000240;
  *(uint32_t*)0x20000240 = 0x170;
  *(uint16_t*)0x20000244 = 0x24;
  *(uint16_t*)0x20000246 = 0xd0b;
  *(uint32_t*)0x20000248 = 0;
  *(uint32_t*)0x2000024c = 0;
  *(uint8_t*)0x20000250 = 0;
  *(uint8_t*)0x20000251 = 0;
  *(uint16_t*)0x20000252 = 0;
  *(uint32_t*)0x20000254 = r[3];
  *(uint16_t*)0x20000258 = 0;
  *(uint16_t*)0x2000025a = 0;
  *(uint16_t*)0x2000025c = -1;
  *(uint16_t*)0x2000025e = -1;
  *(uint16_t*)0x20000260 = 0;
  *(uint16_t*)0x20000262 = 0;
  *(uint16_t*)0x20000264 = 0xa;
  *(uint16_t*)0x20000266 = 1;
  memcpy((void*)0x20000268, "choke\000", 6);
  *(uint16_t*)0x20000270 = 0x11c;
  *(uint16_t*)0x20000272 = 2;
  *(uint16_t*)0x20000274 = 0x104;
  *(uint16_t*)0x20000276 = 2;
  memcpy((void*)0x20000278,
         "\x55\x15\x8e\x77\x70\x58\x1e\x2f\xee\xcf\xdb\x21\x01\x51\x67\x14\xa1"
         "\x53\x7d\xba\x35\x1e\xec\x9b\x0e\x70\x4e\x32\x82\xf0\xc9\x39\x95\x4f"
         "\x30\x1a\x92\x27\xee\xbf\xb7\x76\x02\x3c\xe7\x54\x14\x85\x3e\xbe\x9e"
         "\xbc\x00\xeb\x74\x4c\xf4\xa5\x6f\x74\x01\x0d\xa4\xe8\xd5\x04\x37\x38"
         "\xe0\x9d\x08\x81\x7e\x2d\x3b\xde\xb0\x5f\xcf\x78\x07\x34\x9d\xa9\x2d"
         "\x8c\xac\x9a\xe1\xa4\x1c\x83\x15\x8c\x24\xa9\x89\xfc\xf1\x8c\x1e\x55"
         "\x89\x59\x14\xb7\xef\x59\x5c\x64\x2c\x13\x0d\xf1\x8e\xa3\x29\x35\x7b"
         "\x38\x49\x79\xe7\x52\xc2\x81\x49\x4f\x20\x1c\x2e\x66\x21\x63\x29\x75"
         "\xda\xb8\xed\x80\x5f\x3e\x96\xd8\xd9\x3e\x6a\x3f\xf5\x7b\x17\x97\xcd"
         "\xac\x3a\x50\x21\x6d\x8c\x8d\x9a\xb9\x04\xbf\x82\xd5\x34\x37\xac\x9b"
         "\xf2\x0d\xcf\x91\x21\xee\x30\x74\xe1\x82\xe6\xeb\x3a\x11\xa9\x2c\x14"
         "\xce\x00\x5a\xea\xc2\xc1\x3b\x83\xbb\xd0\x6b\x83\xbe\x3d\xb1\x65\x16"
         "\xd2\x9b\xff\xc9\xba\x25\x09\x0d\xa7\x00\x18\xf0\xaf\x9f\xc8\xd1\x57"
         "\xe7\xbf\x23\x6a\x14\x89\x53\xed\x71\x8c\xc8\xd6\x9d\xa7\x4a\xa7\x84"
         "\x27\x45\xdb\x8b\x97\x9f\x36\x33\xb9\x81\x86\xa3\xa7\x00\x00\x00\x00"
         "\x00",
         256);
  *(uint16_t*)0x20000378 = 0x14;
  *(uint16_t*)0x2000037a = 1;
  *(uint32_t*)0x2000037c = 2;
  *(uint32_t*)0x20000380 = 0;
  *(uint32_t*)0x20000384 = 0;
  *(uint8_t*)0x20000388 = 0;
  *(uint8_t*)0x20000389 = 0;
  *(uint8_t*)0x2000038a = 0xfd;
  *(uint8_t*)0x2000038b = 0;
  *(uint16_t*)0x2000038c = 0x24;
  STORE_BY_BITMASK(uint16_t, , 0x2000038e, 8, 0, 14);
  STORE_BY_BITMASK(uint16_t, , 0x2000038f, 0, 6, 1);
  STORE_BY_BITMASK(uint16_t, , 0x2000038f, 1, 7, 1);
  *(uint16_t*)0x20000390 = 0x1c;
  *(uint16_t*)0x20000392 = 1;
  *(uint8_t*)0x20000394 = 0;
  *(uint8_t*)0x20000395 = 0;
  *(uint16_t*)0x20000396 = 0;
  *(uint32_t*)0x20000398 = 0;
  *(uint32_t*)0x2000039c = 0;
  *(uint32_t*)0x200003a0 = 0;
  *(uint32_t*)0x200003a4 = 0;
  *(uint32_t*)0x200003a8 = 0;
  *(uint16_t*)0x200003ac = 4;
  *(uint16_t*)0x200003ae = 2;
  *(uint64_t*)0x200000c8 = 0x170;
  *(uint64_t*)0x200007d8 = 1;
  *(uint64_t*)0x200007e0 = 0;
  *(uint64_t*)0x200007e8 = 0;
  *(uint32_t*)0x200007f0 = 0;
  syscall(__NR_sendmsg, -1, 0x200007c0ul, 0ul);
  syscall(__NR_sendmmsg, r[0], 0x20000140ul, 3ul, 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;
}