// https://syzkaller.appspot.com/bug?id=7d9f65022605b3d5927fa21529ff73c85262621a
// 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 <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.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>

#ifndef __NR_bpf
#define __NR_bpf 321
#endif
#ifndef __NR_fsconfig
#define __NR_fsconfig 431
#endif
#ifndef __NR_fsmount
#define __NR_fsmount 432
#endif
#ifndef __NR_fsopen
#define __NR_fsopen 430
#endif

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) {
    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;
  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();
      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[4] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff,
                 0x0};

void execute_one(void)
{
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  //  bpf$BPF_PROG_RAW_TRACEPOINT_LOAD arguments: [
  //    cmd: const = 0x5 (8 bytes)
  //    arg: ptr[in, bpf_prog_t[flags[bpf_raw_tracepoint_prog_types, int32],
  //    const[0, int32], const[0, int32], const[0, int32]]] {
  //      bpf_prog_t[flags[bpf_raw_tracepoint_prog_types, int32], const[0,
  //      int32], const[0, int32], const[0, int32]] {
  //        type: bpf_raw_tracepoint_prog_types = 0x8 (4 bytes)
  //        ninsn: bytesize8 = 0x3 (4 bytes)
  //        insns: ptr[inout, array[ANYUNION]] {
  //          array[ANYUNION] {
  //            union ANYUNION {
  //              ANYBLOB: buffer: {18 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  //              00 95} (length 0x11)
  //            }
  //          }
  //        }
  //        license: ptr[in, buffer] {
  //          buffer: {73 79 7a 6b 61 6c 6c 65 72 00} (length 0xa)
  //        }
  //        loglev: int32 = 0x0 (4 bytes)
  //        logsize: len = 0x0 (4 bytes)
  //        log: nil
  //        kern_version: bpf_kern_version = 0x0 (4 bytes)
  //        flags: bpf_prog_load_flags = 0x0 (4 bytes)
  //        prog_name: buffer: {00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00}
  //        (length 0x10) prog_ifindex: ifindex (resource) expected_attach_type:
  //        const = 0x0 (4 bytes) btf_fd: fd_btf (resource) func_info_rec_size:
  //        const = 0x8 (4 bytes) func_info: nil func_info_cnt: len = 0x0 (4
  //        bytes) line_info_rec_size: const = 0x10 (4 bytes) line_info: nil
  //        line_info_cnt: len = 0x0 (4 bytes)
  //        attach_btf_id: const = 0x0 (4 bytes)
  //        attach_prog_fd: const = 0x0 (4 bytes)
  //        core_relo_cnt: len = 0x0 (4 bytes)
  //        fd_array: nil
  //        core_relos: nil
  //        core_relo_rec_size: const = 0x10 (4 bytes)
  //        log_true_size: int32 = 0x0 (4 bytes)
  //        prog_token_fd: union
  //        _bpf_prog_t[flags[bpf_raw_tracepoint_prog_types, int32], const[0,
  //        int32], const[0, int32], const[0, int32]]_prog_token_fd_wrapper {
  //          void: buffer: {} (length 0x0)
  //        }
  //        pad: union _bpf_prog_t[flags[bpf_raw_tracepoint_prog_types, int32],
  //        const[0, int32], const[0, int32], const[0, int32]]_pad_wrapper {
  //          value: const = 0x0 (4 bytes)
  //        }
  //      }
  //    }
  //    size: len = 0x80 (8 bytes)
  //  ]
  //  returns fd_bpf_prog_raw_tracepoint
  *(uint32_t*)0x200000001c40 = 8;
  *(uint32_t*)0x200000001c44 = 3;
  *(uint64_t*)0x200000001c48 = 0x200000001300;
  memcpy((void*)0x200000001300,
         "\x18\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x95",
         17);
  *(uint64_t*)0x200000001c50 = 0x200000001200;
  memcpy((void*)0x200000001200, "syzkaller\000", 10);
  *(uint32_t*)0x200000001c58 = 0;
  *(uint32_t*)0x200000001c5c = 0;
  *(uint64_t*)0x200000001c60 = 0;
  *(uint32_t*)0x200000001c68 = 0;
  *(uint32_t*)0x200000001c6c = 0;
  memset((void*)0x200000001c70, 0, 16);
  *(uint32_t*)0x200000001c80 = 0;
  *(uint32_t*)0x200000001c84 = 0;
  *(uint32_t*)0x200000001c88 = -1;
  *(uint32_t*)0x200000001c8c = 8;
  *(uint64_t*)0x200000001c90 = 0;
  *(uint32_t*)0x200000001c98 = 0;
  *(uint32_t*)0x200000001c9c = 0x10;
  *(uint64_t*)0x200000001ca0 = 0;
  *(uint32_t*)0x200000001ca8 = 0;
  *(uint32_t*)0x200000001cac = 0;
  *(uint32_t*)0x200000001cb0 = 0;
  *(uint32_t*)0x200000001cb4 = 0;
  *(uint64_t*)0x200000001cb8 = 0;
  *(uint64_t*)0x200000001cc0 = 0;
  *(uint32_t*)0x200000001cc8 = 0x10;
  *(uint32_t*)0x200000001ccc = 0;
  *(uint32_t*)0x200000001cd0 = 0;
  res =
      syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x200000001c40ul, /*size=*/0x80ul);
  if (res != -1)
    r[0] = res;
  //  fsopen arguments: [
  //    type: ptr[in, buffer] {
  //      buffer: {63 67 72 6f 75 70 32 00} (length 0x8)
  //    }
  //    flags: fsopen_flags = 0x0 (8 bytes)
  //  ]
  //  returns fd_fscontext
  memcpy((void*)0x200000000000, "cgroup2\000", 8);
  res = syscall(__NR_fsopen, /*type=*/0x200000000000ul, /*flags=*/0ul);
  if (res != -1)
    r[1] = res;
  //  fsconfig$FSCONFIG_CMD_CREATE arguments: [
  //    fd: fd_fscontext (resource)
  //    cmd: const = 0x6 (8 bytes)
  //    key: const = 0x0 (8 bytes)
  //    value: const = 0x0 (8 bytes)
  //    aux: const = 0x0 (8 bytes)
  //  ]
  syscall(__NR_fsconfig, /*fd=*/r[1], /*cmd=*/6ul, /*key=*/0ul, /*value=*/0ul,
          /*aux=*/0ul);
  //  fsmount arguments: [
  //    fs_fd: fd_fscontext (resource)
  //    flags: fsmount_flags = 0x0 (8 bytes)
  //    attr_flags: fsmount_attr_flags = 0x80 (8 bytes)
  //  ]
  //  returns fd
  res = syscall(__NR_fsmount, /*fs_fd=*/r[1], /*flags=*/0ul,
                /*attr_flags=MOUNT_ATTR_NODIRATIME*/ 0x80ul);
  if (res != -1)
    r[2] = res;
  //  bpf$BPF_LINK_CREATE arguments: [
  //    cmd: const = 0x1c (8 bytes)
  //    arg: ptr[in, bpf_link_create_arg_t[fd_bpf_prog, fd_cgroup,
  //    flags[bpf_attach_types_link_create, int32], const[0, int32]]] {
  //      bpf_link_create_arg_t[fd_bpf_prog, fd_cgroup,
  //      flags[bpf_attach_types_link_create, int32], const[0, int32]] {
  //        prog_fd: fd_bpf_prog (resource)
  //        target_fd: fd_cgroup (resource)
  //        attach_type: bpf_attach_types_link_create = 0x0 (4 bytes)
  //        flags: const = 0x0 (4 bytes)
  //        extra: union optional[link_create_arg_extra] {
  //          val: union link_create_arg_extra {
  //            target_btf_id: bpf_btf_id (resource)
  //          }
  //        }
  //      }
  //    }
  //    size: len = 0x10 (8 bytes)
  //  ]
  //  returns fd_bpf_link
  *(uint32_t*)0x2000000003c0 = r[0];
  *(uint32_t*)0x2000000003c4 = r[2];
  *(uint32_t*)0x2000000003c8 = 0;
  *(uint32_t*)0x2000000003cc = 0;
  *(uint32_t*)0x2000000003d0 = 0;
  syscall(__NR_bpf, /*cmd=*/0x1cul, /*arg=*/0x2000000003c0ul, /*size=*/0x10ul);
  //  syz_clone arguments: [
  //    flags: clone_flags = 0x0 (8 bytes)
  //    stack: nil
  //    stack_len: bytesize = 0x0 (8 bytes)
  //    parentid: nil
  //    childtid: nil
  //    tls: nil
  //  ]
  //  returns pid
  res = -1;
  res = syz_clone(/*flags=*/0, /*stack=*/0, /*stack_len=*/0, /*parentid=*/0,
                  /*childtid=*/0, /*tls=*/0);
  if (res != -1)
    r[3] = res;
  //  ptrace arguments: [
  //    req: ptrace_req = 0x10 (8 bytes)
  //    pid: pid (resource)
  //  ]
  syscall(__NR_ptrace, /*req=PTRACE_ATTACH*/ 0x10ul, /*pid=*/r[3], 0, 0);
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000ul,
          /*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=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  const char* reason;
  (void)reason;
  loop();
  return 0;
}