// https://syzkaller.appspot.com/bug?id=7b1188e36d188e8dccdbcc72e0600e00d585cfa3
// 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/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

#include <linux/sched.h>

#ifndef __NR_clone3
#define __NR_clone3 435
#endif

static unsigned long long procid;

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;
}

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");
}

#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) {
  }
}

#define MAX_CLONE_ARGS_BYTES 256
static long syz_clone3(volatile long a0, volatile long a1)
{
  unsigned long copy_size = a1;
  if (copy_size < sizeof(uint64_t) || copy_size > MAX_CLONE_ARGS_BYTES)
    return -1;
  char clone_args[MAX_CLONE_ARGS_BYTES];
  memcpy(&clone_args, (void*)a0, copy_size);
  uint64_t* flags = (uint64_t*)&clone_args;
  *flags &= ~CLONE_VM;
  __atomic_store_n(&clone_ongoing, 1, __ATOMIC_RELAXED);
  return handle_clone_ret((long)syscall(__NR_clone3, &clone_args, copy_size));
}

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();
      exit(0);
    }
    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      sleep_ms(10);
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      if (current_time_ms() - start < 5000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
  }
}

uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  //  socket$pppl2tp arguments: [
  //    domain: const = 0x18 (8 bytes)
  //    type: const = 0x1 (8 bytes)
  //    proto: const = 0x1 (4 bytes)
  //  ]
  //  returns sock_pppl2tp
  res = syscall(__NR_socket, /*domain=*/0x18ul, /*type=*/1ul, /*proto=*/1);
  if (res != -1)
    r[0] = res;
  //  socket$inet6_udp arguments: [
  //    domain: const = 0xa (8 bytes)
  //    type: const = 0x2 (8 bytes)
  //    proto: const = 0x0 (4 bytes)
  //  ]
  //  returns sock_udp6
  res = syscall(__NR_socket, /*domain=*/0xaul, /*type=*/2ul, /*proto=*/0);
  if (res != -1)
    r[1] = res;
  //  connect$pppl2tp arguments: [
  //    fd: sock_pppl2tp (resource)
  //    addr: ptr[in, sockaddr_pppl2tp] {
  //      union sockaddr_pppl2tp {
  //        pppol2tpin6: sockaddr_pppl2tp_t[pppol2tpin6_addr] {
  //          sa_family: const = 0x18 (2 bytes)
  //          sa_protocol: const = 0x1 (4 bytes)
  //          addr: pppol2tpin6_addr_t[int16] {
  //            pid: const = 0x0 (4 bytes)
  //            fd: sock (resource)
  //            s_tunnel: int16 = 0x8 (2 bytes)
  //            s_session: int16 = 0x0 (2 bytes)
  //            d_tunnel: int16 = 0x0 (2 bytes)
  //            d_session: int16 = 0x0 (2 bytes)
  //            addr: sockaddr_in6 {
  //              family: const = 0xa (2 bytes)
  //              port: int16be = 0x4 (2 bytes)
  //              flow: int32be = 0x0 (4 bytes)
  //              addr: union ipv6_addr {
  //                rand_addr: buffer: {20 01 00 00 00 00 00 00 00 00 00 00 00
  //                00 00 00} (length 0x10)
  //              }
  //              scope: int32 = 0x0 (4 bytes)
  //            }
  //          }
  //        }
  //      }
  //    }
  //    addrlen: len = 0x32 (8 bytes)
  //  ]
  NONFAILING(*(uint16_t*)0x200000000000 = 0x18);
  NONFAILING(*(uint32_t*)0x200000000002 = 1);
  NONFAILING(*(uint32_t*)0x200000000006 = 0);
  NONFAILING(*(uint32_t*)0x20000000000a = r[1]);
  NONFAILING(*(uint16_t*)0x20000000000e = 8);
  NONFAILING(*(uint16_t*)0x200000000010 = 0);
  NONFAILING(*(uint16_t*)0x200000000012 = 0);
  NONFAILING(*(uint16_t*)0x200000000014 = 0);
  NONFAILING(*(uint16_t*)0x200000000016 = 0xa);
  NONFAILING(*(uint16_t*)0x200000000018 = htobe16(4));
  NONFAILING(*(uint32_t*)0x20000000001a = htobe32(0));
  NONFAILING(memcpy(
      (void*)0x20000000001e,
      " \001\000\000\000\000\000\000\000\000\000\000\000\000\000\000", 16));
  NONFAILING(*(uint32_t*)0x20000000002e = 0);
  syscall(__NR_connect, /*fd=*/r[0], /*addr=*/0x200000000000ul,
          /*addrlen=*/0x32ul);
  //  sendfile arguments: [
  //    fdout: fd (resource)
  //    fdin: fd (resource)
  //    off: ptr[inout, intptr] {
  //      intptr = 0x3 (8 bytes)
  //    }
  //    count: intptr = 0xac5 (8 bytes)
  //  ]
  NONFAILING(*(uint64_t*)0x200000000040 = 3);
  syscall(__NR_sendfile, /*fdout=*/(intptr_t)-1, /*fdin=*/(intptr_t)-1,
          /*off=*/0x200000000040ul, /*count=*/0xac5ul);
  //  syz_clone3 arguments: [
  //    args: ptr[in, clone_args] {
  //      clone_args {
  //        flags: clone3_flags = 0x23800000 (8 bytes)
  //        pidfd: ptr[out, fd_pidfd] {
  //          fd_pidfd (resource)
  //        }
  //        child_tid: nil
  //        parent_tid: nil
  //        exit_signal: align64[signalno] {
  //          v: int32 = 0x27 (4 bytes)
  //          pad = 0x0 (4 bytes)
  //        }
  //        stack: nil
  //        stack_size: bytesize = 0x0 (8 bytes)
  //        tls: nil
  //        set_tid: nil
  //        set_tid_size: len = 0x0 (8 bytes)
  //        cgroup: align64[fd_cgroup] {
  //          v: fd_cgroup (resource)
  //          pad = 0x0 (4 bytes)
  //        }
  //      }
  //    }
  //    size: bytesize = 0x58 (8 bytes)
  //  ]
  //  returns pid
  NONFAILING(*(uint64_t*)0x200000000900 = 0x23800000);
  NONFAILING(*(uint64_t*)0x200000000908 = 0x200000000040);
  NONFAILING(*(uint64_t*)0x200000000910 = 0);
  NONFAILING(*(uint64_t*)0x200000000918 = 0);
  NONFAILING(*(uint32_t*)0x200000000920 = 0x27);
  NONFAILING(*(uint64_t*)0x200000000928 = 0);
  NONFAILING(*(uint64_t*)0x200000000930 = 0);
  NONFAILING(*(uint64_t*)0x200000000938 = 0);
  NONFAILING(*(uint64_t*)0x200000000940 = 0);
  NONFAILING(*(uint64_t*)0x200000000948 = 0);
  NONFAILING(*(uint32_t*)0x200000000950 = -1);
  res = -1;
  NONFAILING(res = syz_clone3(/*args=*/0x200000000900, /*size=*/0x58));
  if (res != -1)
    NONFAILING(r[2] = *(uint32_t*)0x200000000040);
  //  ioctl$EXT4_IOC_GETFSUUID arguments: [
  //    fd: fd (resource)
  //    cmd: const = 0x80047453 (4 bytes)
  //    arg: nil
  //  ]
  syscall(__NR_ioctl, /*fd=*/r[2], /*cmd=*/0x80047453, /*arg=*/0ul);
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200001000000ul, /*len=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  const char* reason;
  (void)reason;
  install_segv_handler();
  for (procid = 0; procid < 5; procid++) {
    if (fork() == 0) {
      loop();
    }
  }
  sleep(1000000);
  return 0;
}