// https://syzkaller.appspot.com/bug?id=9bedd6f83d26d46c0abacc34e468aca4e0484c28
// 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);
  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[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff};

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, 0x803ul, 0);
  if (res != -1)
    r[1] = 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[1], 0x200001c0ul, 0ul);
  *(uint32_t*)0x20000200 = 0x14;
  res = syscall(__NR_getsockname, r[1], 0x20000100ul, 0x20000200ul);
  if (res != -1)
    r[2] = *(uint32_t*)0x20000104;
  *(uint64_t*)0x200007c0 = 0;
  *(uint32_t*)0x200007c8 = 0;
  *(uint64_t*)0x200007d0 = 0x200000c0;
  *(uint64_t*)0x200000c0 = 0x20000340;
  memcpy((void*)0x20000340, "\x48\x01\x00\x00\x24\x00\x09\x0e\x00\x00\x00\x00"
                            "\x00\x00\x00\x00\x00\x00\x00\x00",
         20);
  *(uint32_t*)0x20000354 = r[2];
  memcpy((void*)0x20000358,
         "\x00\x00\x00\x00\xff\xff\xff\xff\x00\x00\x00\x00\x08\x00\x01\x00\x72"
         "\x65\x64\x00\x1c\x01\x02\x00\x04\x01\x02\x00\xd2\x77\xf9\x6b\x02\x26"
         "\xe7\x04\xb1\x86\xe5\x7e\x69\x0c\x84\xda\x78\xc6\x0b\xf1\x75\xb2\xd5"
         "\x27\xd2\xbd\x85\xee\x43\x63\x76\x08\xdc\xde\xf7\xea\xd3\xed\xfa\xd1"
         "\xd8\x7d\xf8\x51\x64\x39\x06\xf3\xd8\x24\xa3\x42\xf8\xc3\xe9\xa6\x36"
         "\x18\xd3\x04\x22\x8a\x31\xf3\x91\xc7\xe2\xfe\xd2\xf6\x07\xb5\xb6\xe0"
         "\x75\xa3\xeb\x3f\xe3\x8d\x28\xd3\xe1\x45\x17\x2b\x92\xf6\x7a\x72\x2f"
         "\x07\x96\x78\x41\x34\x93\x88\x79\xae\xb0\xde\xeb\x0c\x2e\x99\x36\xdf"
         "\x0f\x4f\x21\x9b\x69\xc0\xe8\x56\x95\x90\xa3\xdb\xdd\x91\xb6\xea\x84"
         "\x92\x97\xb5\x5b\xa6\x1e\x01\x54\x85\x74\x3f\x92\x63\xdf\x38\x57\x44"
         "\xd2\xef\x1c\xe1\xc5\xcd\xf6\x5f\x61\x01\x77\xb0\xbd\x91\xf7\x4f\x33"
         "\xdc\x99\x54\x2e\xd9\x95\xe5\x55\x2b\x37\xd1\x78\x04\x9c\xa1\x58\x84"
         "\xfb\xc5\x55\x90\x4f\x95\x18\x98\xa5\x46\x47\xc0\x91\x75\x8f\x29\xc3"
         "\x8b\xca\xd0\x1e\x8f\xca\xcc\xeb\xf9\xc2\x69\x93\x50\xb8\x7c\x3d\x5c"
         "\xdd\xa7\x27\xc4\x42\x2a\x56\x90\xd7\x9f\x38\x2a\xe3\x7e\x3a\x41\x36"
         "\x54\xfb\x8c\x63\xf4\x48\xbe\xf3\x17\x12\x4a\xa3\x6d\xfc\x4e\x32\xf1"
         "\x20\x6f\x93\x16\x3d\x86\x9b\x04\xdd\xcd\x55\x41\x14\x00\x01\x00\x00"
         "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x34\xff",
         304);
  *(uint64_t*)0x200000c8 = 0x148;
  *(uint64_t*)0x200007d8 = 1;
  *(uint64_t*)0x200007e0 = 0;
  *(uint64_t*)0x200007e8 = 0;
  *(uint32_t*)0x200007f0 = 0;
  syscall(__NR_sendmsg, r[0], 0x200007c0ul, 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;
}