// https://syzkaller.appspot.com/bug?id=016814f413b437ebf8d530b3775e620a892cf584
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <sched.h>
#include <setjmp.h>
#include <signal.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 <time.h>
#include <unistd.h>

#include <linux/capability.h>

#ifndef __NR_bpf
#define __NR_bpf 321
#endif

static __thread int clone_ongoing;
static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* ctx)
{
  if (__atomic_load_n(&clone_ongoing, __ATOMIC_RELAXED) != 0) {
    exit(sig);
  }
  uintptr_t addr = (uintptr_t)info->si_addr;
  const uintptr_t prog_start = 1 << 20;
  const uintptr_t prog_end = 100 << 20;
  int skip = __atomic_load_n(&skip_segv, __ATOMIC_RELAXED) != 0;
  int valid = addr < prog_start || addr > prog_end;
  if (skip && valid) {
    _longjmp(segv_env, 1);
  }
  exit(sig);
}

static void install_segv_handler(void)
{
  struct sigaction sa;
  memset(&sa, 0, sizeof(sa));
  sa.sa_handler = SIG_IGN;
  syscall(SYS_rt_sigaction, 0x20, &sa, NULL, 8);
  syscall(SYS_rt_sigaction, 0x21, &sa, NULL, 8);
  memset(&sa, 0, sizeof(sa));
  sa.sa_sigaction = segv_handler;
  sa.sa_flags = SA_NODEFER | SA_SIGINFO;
  sigaction(SIGSEGV, &sa, NULL);
  sigaction(SIGBUS, &sa, NULL);
}

#define NONFAILING(...)                                                        \
  ({                                                                           \
    int ok = 1;                                                                \
    __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    if (_setjmp(segv_env) == 0) {                                              \
      __VA_ARGS__;                                                             \
    } else                                                                     \
      ok = 0;                                                                  \
    __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    ok;                                                                        \
  })

static void sleep_ms(uint64_t ms)
{
  usleep(ms * 1000);
}

static uint64_t current_time_ms(void)
{
  struct timespec ts;
  if (clock_gettime(CLOCK_MONOTONIC, &ts))
    exit(1);
  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

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;
}

#define MAX_FDS 30

static long syz_open_dev(volatile long a0, volatile long a1, volatile long a2)
{
  if (a0 == 0xc || a0 == 0xb) {
    char buf[128];
    sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block", (uint8_t)a1,
            (uint8_t)a2);
    return open(buf, O_RDWR, 0);
  } else {
    char buf[1024];
    char* hash;
    strncpy(buf, (char*)a0, sizeof(buf) - 1);
    buf[sizeof(buf) - 1] = 0;
    while ((hash = strchr(buf, '#'))) {
      *hash = '0' + (char)(a1 % 10);
      a1 /= 10;
    }
    return open(buf, a2, 0);
  }
}

static long syz_open_procfs(volatile long a0, volatile long a1)
{
  char buf[128];
  memset(buf, 0, sizeof(buf));
  if (a0 == 0) {
    snprintf(buf, sizeof(buf), "/proc/self/%s", (char*)a1);
  } else if (a0 == -1) {
    snprintf(buf, sizeof(buf), "/proc/thread-self/%s", (char*)a1);
  } else {
    snprintf(buf, sizeof(buf), "/proc/self/task/%d/%s", (int)a0, (char*)a1);
  }
  int fd = open(buf, O_RDWR);
  if (fd == -1)
    fd = open(buf, O_RDONLY);
  return fd;
}

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);
}

static void kill_and_wait(int pid, int* status)
{
  kill(-pid, SIGKILL);
  kill(pid, SIGKILL);
  for (int i = 0; i < 100; i++) {
    if (waitpid(-1, status, WNOHANG | __WALL) == pid)
      return;
    usleep(1000);
  }
  DIR* dir = opendir("/sys/fs/fuse/connections");
  if (dir) {
    for (;;) {
      struct dirent* ent = readdir(dir);
      if (!ent)
        break;
      if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0)
        continue;
      char abort[300];
      snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort",
               ent->d_name);
      int fd = open(abort, O_WRONLY);
      if (fd == -1) {
        continue;
      }
      if (write(fd, abort, 1) < 0) {
      }
      close(fd);
    }
    closedir(dir);
  } else {
  }
  while (waitpid(-1, status, __WALL) != pid) {
  }
}

static void setup_test()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
  write_file("/proc/self/oom_score_adj", "1000");
}

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

#define USLEEP_FORKED_CHILD (3 * 50 * 1000)

static long handle_clone_ret(long ret)
{
  if (ret != 0) {
    __atomic_store_n(&clone_ongoing, 0, __ATOMIC_RELAXED);
    return ret;
  }
  usleep(USLEEP_FORKED_CHILD);
  syscall(__NR_exit, 0);
  while (1) {
  }
}

static long syz_clone(volatile long flags, volatile long stack,
                      volatile long stack_len, volatile long ptid,
                      volatile long ctid, volatile long tls)
{
  long sp = (stack + stack_len) & ~15;
  __atomic_store_n(&clone_ongoing, 1, __ATOMIC_RELAXED);
  long ret = (long)syscall(__NR_clone, flags & ~CLONE_VM, sp, ptid, ctid, tls);
  return handle_clone_ret(ret);
}

static void execute_one(void);

#define WAIT_FLAGS __WALL

static void loop(void)
{
  int iter = 0;
  for (;; iter++) {
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      setup_test();
      execute_one();
      close_fds();
      exit(0);
    }
    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      sleep_ms(1);
      if (current_time_ms() - start < 5000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
  }
}

uint64_t r[5] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff,
                 0xffffffffffffffff, 0x0};

void execute_one(void)
{
  intptr_t res = 0;
  syscall(__NR_dup3, /*oldfd=*/-1, /*newfd=*/-1, /*flags=*/0ul);
  res = -1;
  NONFAILING(res = syz_open_dev(/*dev=*/0, /*id=*/2, /*flags=*/0x400));
  if (res != -1)
    r[0] = res;
  NONFAILING(memcpy((void*)0x20000040, "mounts\000", 7));
  res = -1;
  NONFAILING(res = syz_open_procfs(/*pid=*/-1, /*file=*/0x20000040));
  if (res != -1)
    r[1] = res;
  syscall(__NR_preadv, /*fd=*/r[1], /*vec=*/0ul, /*vlen=*/0ul,
          /*off_low=*/0x436, /*off_high=*/0);
  NONFAILING(memcpy((void*)0x20000100, "./file0\000", 8));
  res = syscall(__NR_open, /*file=*/0x20000100ul, /*flags=*/0ul, /*mode=*/0ul);
  if (res != -1)
    r[2] = res;
  syscall(__NR_write, /*fd=*/r[2], /*data=*/0ul, /*size=*/0x122ul);
  NONFAILING(*(uint32_t*)0x20000200 = 0xc);
  NONFAILING(*(uint32_t*)0x20000204 = 0xe);
  NONFAILING(*(uint64_t*)0x20000208 = 0);
  NONFAILING(*(uint64_t*)0x20000210 = 0x20000340);
  NONFAILING(memcpy((void*)0x20000340, "syzkaller\000", 10));
  NONFAILING(*(uint32_t*)0x20000218 = 0);
  NONFAILING(*(uint32_t*)0x2000021c = 0);
  NONFAILING(*(uint64_t*)0x20000220 = 0);
  NONFAILING(*(uint32_t*)0x20000228 = 0);
  NONFAILING(*(uint32_t*)0x2000022c = 0);
  NONFAILING(memset((void*)0x20000230, 0, 16));
  NONFAILING(*(uint32_t*)0x20000240 = 0);
  NONFAILING(*(uint32_t*)0x20000244 = 0);
  NONFAILING(*(uint32_t*)0x20000248 = -1);
  NONFAILING(*(uint32_t*)0x2000024c = 8);
  NONFAILING(*(uint64_t*)0x20000250 = 0);
  NONFAILING(*(uint32_t*)0x20000258 = 0);
  NONFAILING(*(uint32_t*)0x2000025c = 0x10);
  NONFAILING(*(uint64_t*)0x20000260 = 0);
  NONFAILING(*(uint32_t*)0x20000268 = 0);
  NONFAILING(*(uint32_t*)0x2000026c = 0);
  NONFAILING(*(uint32_t*)0x20000270 = -1);
  NONFAILING(*(uint32_t*)0x20000274 = 0);
  NONFAILING(*(uint64_t*)0x20000278 = 0);
  NONFAILING(*(uint64_t*)0x20000280 = 0);
  NONFAILING(*(uint32_t*)0x20000288 = 0x10);
  NONFAILING(*(uint32_t*)0x2000028c = 0);
  syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x20000200ul, /*size=*/0x90ul);
  NONFAILING(*(uint32_t*)0x20000200 = 0x18);
  NONFAILING(*(uint32_t*)0x20000204 = 4);
  NONFAILING(*(uint64_t*)0x20000208 = 0x200002c0);
  NONFAILING(memcpy((void*)0x200002c0,
                    "\x18\x01\x00\x00\x08\x00\x00\x00\x00\x00\x00\x00\x5e\x00"
                    "\x22\x00\x85\x00\x00\x00\x6d\x00\x00\x00\x95",
                    25));
  NONFAILING(*(uint64_t*)0x20000210 = 0x20000140);
  NONFAILING(memcpy((void*)0x20000140, "syzkaller\000", 10));
  NONFAILING(*(uint32_t*)0x20000218 = 0);
  NONFAILING(*(uint32_t*)0x2000021c = 0);
  NONFAILING(*(uint64_t*)0x20000220 = 0);
  NONFAILING(*(uint32_t*)0x20000228 = 0);
  NONFAILING(*(uint32_t*)0x2000022c = 0);
  NONFAILING(memset((void*)0x20000230, 0, 16));
  NONFAILING(*(uint32_t*)0x20000240 = 0);
  NONFAILING(*(uint32_t*)0x20000244 = 2);
  NONFAILING(*(uint32_t*)0x20000248 = -1);
  NONFAILING(*(uint32_t*)0x2000024c = 8);
  NONFAILING(*(uint64_t*)0x20000250 = 0);
  NONFAILING(*(uint32_t*)0x20000258 = 0);
  NONFAILING(*(uint32_t*)0x2000025c = 0x10);
  NONFAILING(*(uint64_t*)0x20000260 = 0);
  NONFAILING(*(uint32_t*)0x20000268 = 0);
  NONFAILING(*(uint32_t*)0x2000026c = 0);
  NONFAILING(*(uint32_t*)0x20000270 = 0);
  NONFAILING(*(uint32_t*)0x20000274 = 0);
  NONFAILING(*(uint64_t*)0x20000278 = 0);
  NONFAILING(*(uint64_t*)0x20000280 = 0);
  NONFAILING(*(uint32_t*)0x20000288 = 0x10);
  NONFAILING(*(uint32_t*)0x2000028c = 0);
  res = syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x20000200ul, /*size=*/0x80ul);
  if (res != -1)
    r[3] = res;
  NONFAILING(*(uint64_t*)0x20000080 = 0x20000000);
  NONFAILING(memcpy((void*)0x20000000, "kmem_cache_free\000", 16));
  NONFAILING(*(uint32_t*)0x20000088 = r[3]);
  syscall(__NR_bpf, /*cmd=*/0x11ul, /*arg=*/0x20000080ul, /*size=*/0x10ul);
  syscall(__NR_bpf, /*cmd=*/0xaul, /*arg=*/0ul, /*size=*/0ul);
  syscall(__NR_ioctl, /*fd=*/r[2], /*cmd=*/0xb702, /*arg=*/0ul);
  NONFAILING(memcpy((void*)0x200001c0, "/dev/hwrng\000", 11));
  syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x200001c0ul,
          /*flags=*/0x224d42ul, /*mode=*/0ul);
  NONFAILING(*(uint64_t*)0x20000040 = 0);
  NONFAILING(*(uint32_t*)0x20000048 = 0);
  NONFAILING(*(uint64_t*)0x20000050 = 0);
  NONFAILING(*(uint64_t*)0x20000058 = 1);
  NONFAILING(*(uint64_t*)0x20000060 = 0);
  NONFAILING(*(uint64_t*)0x20000068 = 0);
  NONFAILING(*(uint32_t*)0x20000070 = 0);
  syscall(__NR_sendmsg, /*fd=*/-1, /*msg=*/0x20000040ul, /*f=*/0ul);
  res = -1;
  NONFAILING(res = syz_clone(/*flags=*/0x40005080, /*stack=*/0, /*stack_len=*/0,
                             /*parentid=*/0, /*childtid=*/0, /*tls=*/0));
  if (res != -1)
    r[4] = res;
  syscall(__NR_ioprio_set, /*which=*/3ul, /*who=*/r[4], /*ioprio=*/0x2004ul);
  NONFAILING(*(uint64_t*)0x20000300 = 0);
  NONFAILING(*(uint32_t*)0x20000308 = 0);
  NONFAILING(*(uint64_t*)0x20000310 = 0);
  NONFAILING(*(uint64_t*)0x20000318 = 1);
  NONFAILING(*(uint64_t*)0x20000320 = 0);
  NONFAILING(*(uint64_t*)0x20000328 = 0);
  NONFAILING(*(uint32_t*)0x20000330 = 0x4044845);
  syscall(__NR_sendmsg, /*fd=*/r[0], /*msg=*/0x20000300ul, /*f=*/0x44801ul);
}
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);
  install_segv_handler();
  do_sandbox_none();
  return 0;
}