// https://syzkaller.appspot.com/bug?id=16b2ebdc9899528d52c7aaebac35574a1f87710c
// 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 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)) {
  }
  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);
}

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,
                 0xffffffffffffffff};

void loop(void)
{
  intptr_t res = 0;
  res = syscall(__NR_socket, 0x10, 3, 0);
  if (res != -1)
    r[0] = res;
  res = syscall(__NR_socket, 0x10, 3, 0);
  if (res != -1)
    r[1] = res;
  res = syscall(__NR_socket, 0x10, 0x803, 0);
  if (res != -1)
    r[2] = res;
  *(uint64_t*)0x20000400 = 0;
  *(uint32_t*)0x20000408 = 0;
  *(uint64_t*)0x20000410 = 0x200003c0;
  *(uint64_t*)0x200003c0 = 0;
  *(uint64_t*)0x200003c8 = 0;
  *(uint64_t*)0x20000418 = 1;
  *(uint64_t*)0x20000420 = 0;
  *(uint64_t*)0x20000428 = 0;
  *(uint32_t*)0x20000430 = 0;
  syscall(__NR_sendmsg, r[2], 0x20000400, 0);
  *(uint32_t*)0x20000200 = 0xa;
  res = syscall(__NR_getsockname, r[2], 0x20000100, 0x20000200);
  if (res != -1)
    r[3] = *(uint32_t*)0x20000104;
  *(uint64_t*)0x20000140 = 0;
  *(uint32_t*)0x20000148 = 0;
  *(uint64_t*)0x20000150 = 0x20000080;
  *(uint64_t*)0x20000080 = 0x20000540;
  *(uint32_t*)0x20000540 = 0x148;
  *(uint16_t*)0x20000544 = 0x24;
  *(uint16_t*)0x20000546 = 0x507;
  *(uint32_t*)0x20000548 = 0;
  *(uint32_t*)0x2000054c = 0;
  *(uint8_t*)0x20000550 = 0;
  *(uint32_t*)0x20000554 = r[3];
  *(uint16_t*)0x20000558 = 0;
  *(uint16_t*)0x2000055a = 0;
  *(uint16_t*)0x2000055c = -1;
  *(uint16_t*)0x2000055e = -1;
  *(uint16_t*)0x20000560 = 0;
  *(uint16_t*)0x20000562 = 0;
  *(uint16_t*)0x20000564 = 8;
  *(uint16_t*)0x20000566 = 1;
  memcpy((void*)0x20000568, "red\000", 4);
  *(uint16_t*)0x2000056c = 0x11c;
  *(uint16_t*)0x2000056e = 2;
  *(uint16_t*)0x20000570 = 0x104;
  *(uint16_t*)0x20000572 = 2;
  memcpy((void*)0x20000574,
         "\xfb\xf8\x4c\xe9\xdb\xec\xf3\xd5\x85\x1a\xe0\x60\xc0\xec\x8d\x55\xc9"
         "\xc6\x5c\xb9\x8d\x69\xf6\xf4\x3f\x1d\x64\xd4\x75\xf2\x79\xdd\x20\x4e"
         "\x54\xf6\x71\x9d\xe4\x08\xd6\x40\xf2\xdc\xd4\xc0\xc8\xc6\x15\x65\x0d"
         "\xe0\x53\x1b\x13\x93\x80\xf9\x12\xf8\x08\xe5\xd3\xe1\x11\x8f\x76\x14"
         "\x4d\x15\x68\xbe\x42\x5b\xdd\xb2\x9f\xa4\xcb\x12\x51\xd5\xcc\x8b\x78"
         "\xfb\x74\x2b\xd6\x16\x74\xf4\xcd\x92\xa9\x3f\x8d\xaf\xea\x3b\xc8\x23"
         "\xcc\xd7\x59\x1d\x59\xd2\x52\xa2\x75\x01\x21\x01\xf3\x9a\xb9\x47\x8c"
         "\xc5\xdc\x4a\x8a\x2e\x71\xf1\x86\xce\x68\x8a\xe8\x69\x90\x51\xea\x70"
         "\x16\x24\xac\x60\xf1\xdc\x92\x6f\xd9\x7b\x40\xb6\x22\x31\xd2\x43\xdb"
         "\x1e\xca\x47\x24\x40\xf1\x20\x3b\x69\x1b\x7b\x85\x86\x4a\x73\xf1\xa3"
         "\xa9\x66\x4d\x07\x5a\xc9\x73\x15\x89\x48\xf7\xc4\x4b\x4f\x8e\x23\x48"
         "\xe8\x04\x6b\x08\xdc\xb4\x23\x64\x7e\xff\x25\x39\x99\x3b\x89\x85\x02"
         "\x8d\x7f\x0a\x50\xe9\x4e\xe6\xb2\xfd\xac\xff\x6a\xee\x49\x6b\x13\x80"
         "\x7e\xb8\xd4\x06\xa8\x44\x0a\xf1\x4e\x33\x97\x13\xf9\x3a\x2b\xd7\x6d"
         "\x46\xd3\x44\x52\xc9\xbf\x60\x4a\xc6\x1d\x66\xe9\xff\x34\x50\x3a\x7f"
         "\xf4",
         256);
  *(uint16_t*)0x20000674 = 0x14;
  *(uint16_t*)0x20000676 = 1;
  *(uint32_t*)0x20000678 = 0;
  *(uint32_t*)0x2000067c = 0;
  *(uint32_t*)0x20000680 = 0;
  *(uint8_t*)0x20000684 = 0;
  *(uint8_t*)0x20000685 = 0;
  *(uint8_t*)0x20000686 = 0;
  *(uint8_t*)0x20000687 = 0;
  *(uint64_t*)0x20000088 = 0x148;
  *(uint64_t*)0x20000158 = 1;
  *(uint64_t*)0x20000160 = 0;
  *(uint64_t*)0x20000168 = 0;
  *(uint32_t*)0x20000170 = 0;
  syscall(__NR_sendmsg, r[1], 0x20000140, 0);
  *(uint64_t*)0x200000c0 = 0;
  *(uint32_t*)0x200000c8 = 0;
  *(uint64_t*)0x200000d0 = 0x20000080;
  *(uint64_t*)0x20000080 = 0x20000480;
  memcpy((void*)0x20000480, "\x24\x00\x00\x00\x29\x00\xdf\xff\xff\xff\xff\xff"
                            "\xff\xff\x00\x00\x00\x00\x00\x00",
         20);
  *(uint32_t*)0x20000494 = r[3];
  memcpy((void*)0x20000498,
         "\x1f\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x7e\x78\xc6\x2b\x06"
         "\x64\x92\x28\x5b\xd4\x5a\xdb\x55\xdd\xf6\x8c\x0a\xb2\x1d\x9a\x4a\xe2"
         "\x20\xde\xbe\xb1\x67\x7f\xea\xb2\x51\xa0\xc2\xef\x92\xee\x33\x52\xc7"
         "\xc4\x0a\xb0\x5c\xc8\x2d\xa2\xc3\xcc\x0d\x95\x5f\xca\xa7\xbf\x20\x9c"
         "\x21\x43\x5f\xe1\xf9\xe9\x80\x17\x01\xcb\xdb\x81\x62\x5a\xc6\xdc\xd2"
         "\x34\xb2\x35\x49\x75\x68\xe5\xc9\x86\x5f\xa9\x54\x37\x3d\x47\x52\xa7"
         "\x42\x21\xf7\x7e\xdb\xad\xe3\x2f\x33\x0c\xa6\x21\x7f\x89\xeb\x69\x73"
         "\x1d\xfd\xcd\x54\x97\xd1\x7c\xeb\x87\xce\x6c\x1b\x77\xef\x3e\x2a\x5e"
         "\x93\x0d\x3a\x33\xea\x29\xa1\x12\xfc\xa6",
         146);
  *(uint64_t*)0x20000088 = 0x24;
  *(uint64_t*)0x200000d8 = 1;
  *(uint64_t*)0x200000e0 = 0;
  *(uint64_t*)0x200000e8 = 0;
  *(uint32_t*)0x200000f0 = 0;
  syscall(__NR_sendmsg, r[0], 0x200000c0, 0);
}
int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  do_sandbox_none();
  return 0;
}