mirror of
https://github.com/cloud-hypervisor/cloud-hypervisor.git
synced 2024-12-22 13:45:20 +00:00
53 lines
1.7 KiB
Rust
53 lines
1.7 KiB
Rust
// Copyright 2018 The Chromium OS Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style license that can be
|
|
// found in the LICENSE-BSD-3-Clause file.
|
|
//
|
|
// SPDX-License-Identifier: Apache-2.0 AND BSD-3-Clause
|
|
|
|
#![no_main]
|
|
use std::ffi;
|
|
use std::fs::File;
|
|
use std::io::{self, Cursor, Read, Seek, SeekFrom, Write};
|
|
use std::mem::size_of;
|
|
use std::os::unix::io::{FromRawFd, RawFd};
|
|
|
|
use block::qcow::{QcowFile, RawFile};
|
|
use libfuzzer_sys::fuzz_target;
|
|
|
|
// Take the first 64 bits of data as an address and the next 64 bits as data to
|
|
// store there. The rest of the data is used as a qcow image.
|
|
fuzz_target!(|bytes| {
|
|
if bytes.len() < 16 {
|
|
// Need an address and data, each are 8 bytes.
|
|
return;
|
|
}
|
|
let mut disk_image = Cursor::new(bytes);
|
|
let addr = read_u64(&mut disk_image);
|
|
let value = read_u64(&mut disk_image);
|
|
let shm = memfd_create(&ffi::CString::new("fuzz").unwrap(), 0).unwrap();
|
|
let mut disk_file: File = unsafe { File::from_raw_fd(shm) };
|
|
disk_file.write_all(&bytes[16..]).unwrap();
|
|
disk_file.seek(SeekFrom::Start(0)).unwrap();
|
|
if let Ok(mut qcow) = QcowFile::from(RawFile::new(disk_file, false)) {
|
|
if qcow.seek(SeekFrom::Start(addr)).is_ok() {
|
|
let _ = qcow.write_all(&value.to_le_bytes());
|
|
}
|
|
}
|
|
});
|
|
|
|
fn read_u64<T: Read>(readable: &mut T) -> u64 {
|
|
let mut buf = [0u8; size_of::<u64>()];
|
|
readable.read_exact(&mut buf[..]).unwrap();
|
|
u64::from_le_bytes(buf)
|
|
}
|
|
|
|
fn memfd_create(name: &ffi::CStr, flags: u32) -> Result<RawFd, io::Error> {
|
|
let res = unsafe { libc::syscall(libc::SYS_memfd_create, name.as_ptr(), flags) };
|
|
|
|
if res < 0 {
|
|
Err(io::Error::last_os_error())
|
|
} else {
|
|
Ok(res as RawFd)
|
|
}
|
|
}
|