// https://syzkaller.appspot.com/bug?id=0ff29101efe3523c886bd8b912945241a1c6b1b4
// 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);
}

static void close_fds()
{
  int fd;
  for (fd = 3; fd < 30; fd++)
    close(fd);
}

uint64_t r[1] = {0xffffffffffffffff};

void loop(void)
{
  intptr_t res = 0;
  *(uint64_t*)0x20005c00 = 0;
  *(uint32_t*)0x20005c08 = 0;
  *(uint64_t*)0x20005c10 = 0;
  *(uint64_t*)0x20005c18 = 0;
  *(uint64_t*)0x20005c20 = 0x200003c0;
  memcpy((void*)0x200003c0,
         "\x18\x00\x00\x00\x00\x00\x00\x00\x10\x01\x00\x00\x01\x00\x00\x00\x77"
         "\x00\x00\xf2\x00\x00\x00\x00\xa6\xe2\x17\xb9\x1c\x3b\x0d\x87\x37\x22"
         "\xb4\x1a\x11\x8f\xd5\x8f\xa1\xf0\xa3\x9a\xd9\x58\x22\x03\xda\xa3\x2c"
         "\x98\x5b\xff\x40\xe0\x62\xa4\x3f\x80\xb1\xba\xbf\xd0\x76\xd5\x50\x28"
         "\x92\x25\x0d\xee\xe2\x72\x83\x16\xe6\x3e\x58\x9d\xdf\x14\x2e\x89\x36"
         "\x5b\xd4\x8c\xf7\x66\x02\xc6\xf6\xaa\x76\xbc\x37\x28\x47\x32\xbd\x1e"
         "\x19\x1d\xdd\x3c\x9f\x31\x0f\x82\x7c\x19\x5f\x3c\x49\x57\xc6\x7a\x08"
         "\x46\x65\x17\xba\x13\x6c\x8c\x9e\x01\x00\x00\x00\xf8\xff\xff\xff\xff"
         "\xff\xff\xff\x3e\x26\xb5\xca\x26\xbb\x43\x4d\xbd\x0e\x48\x85\xc2\x94"
         "\xe5\x77\xbb\x08\x18\x76\xe6\x3e\x7c\x63\xce\xce\x18\xce\x2c\xae\x64"
         "\xb3\x3d\xa7\xb9\x47\xae\xfc\xa1\xf9\xc4\x9c\x64\x92\x9a\xe5\x1c\xfc"
         "\xb5\x9b\x75\xae\x57\xa1\xd6\x4c\x15\x37\x24\xfa\x18\xa6\x61\x81\xa8"
         "\xe7\x70\x53\x9e\xb9\xa9\xe2\x56\x4a\x3b\x7b\x3b\xd7\x5b\x71\xdf\x53"
         "\xee\x23\x40\x60\xe4\x87\xe6\xf9\x65\x03\x29\x0d\x8c\x42\x6d\x0f\x3f"
         "\x8e\x02\x4d\xed\x1a\x2c\x12\x60\x2e\xe1\x7a\xcc\x3f\xf1\xfa\x97\x92"
         "\x32\x6e\x7f\xba\x9d\x6b\x76\xf1\x1d\x61\xf3\xcc\x6e\x49\x5a\x3e\xf8"
         "\x5d\x6b\xfb\x5f\xb5\xc2\x9c\xca\x85\x00\x25\xe4\x64\x92\x8e\x10\x2a"
         "\xd7\x83\xd3\x7c\x44\xd6\xd6\x91\x46\x3a\x21\x3a\x17\x8b\x48\xdd\x1e"
         "\xd7\xdc\xa9\x5d\x8c\xca\x36\xed\xf6\x72\xd7\x43\xa1\xa8\x38\x5e\x78"
         "\xb4\x94\xcd\x1d\xa3\xb0\xd1\x15\xfd\x4f\x59\xd8\x17\x49\xb1\x8b\xa5"
         "\x54\x15\x6c\xa8\x8b\xcc\xac\xdd\x77\x3b\x25\xf0\x2f\x00\xff\x5e\x38"
         "\x19\xbb\x1b\x2e\x83\x5e\x00",
         364);
  *(uint64_t*)0x20005c28 = 0x18;
  *(uint32_t*)0x20005c30 = 0;
  *(uint32_t*)0x20005c38 = 0;
  syscall(__NR_sendmmsg, -1, 0x20005c00, 1, 0x4048000);
  res = syscall(__NR_socket, 0x2000000000000021, 2, 2);
  if (res != -1)
    r[0] = res;
  *(uint16_t*)0x20000040 = 0x21;
  *(uint16_t*)0x20000042 = 0;
  *(uint16_t*)0x20000044 = 2;
  *(uint16_t*)0x20000046 = 0x10;
  *(uint16_t*)0x20000048 = 2;
  *(uint16_t*)0x2000004a = htobe16(0x4e20);
  *(uint8_t*)0x2000004c = 0xac;
  *(uint8_t*)0x2000004d = 0x14;
  *(uint8_t*)0x2000004e = 0x14;
  *(uint8_t*)0x2000004f = 0xaa;
  syscall(__NR_connect, r[0], 0x20000040, 0x24);
  syscall(__NR_sendmmsg, r[0], 0x20005c00, 1, 0);
  close_fds();
}
int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  do_sandbox_none();
  return 0;
}