mirror of
https://github.com/cloud-hypervisor/cloud-hypervisor.git
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51 lines
1.5 KiB
Rust
51 lines
1.5 KiB
Rust
// Copyright 2018 The Chromium OS Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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//
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// Copyright © 2022 Intel Corporation
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//
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// SPDX-License-Identifier: Apache-2.0 AND BSD-3-Clause
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#![no_main]
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use libfuzzer_sys::fuzz_target;
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use linux_loader::loader::KernelLoader;
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use std::ffi;
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use std::fs::File;
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use std::io;
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use std::io::{Seek, SeekFrom, Write};
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use std::os::unix::io::{FromRawFd, RawFd};
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use vm_memory::{bitmap::AtomicBitmap, GuestAddress};
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type GuestMemoryMmap = vm_memory::GuestMemoryMmap<AtomicBitmap>;
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const MEM_SIZE: usize = 256 * 1024 * 1024;
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// From 'arch::x86_64::layout::HIGH_RAM_START'
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const HIGH_RAM_START: GuestAddress = GuestAddress(0x100000);
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fuzz_target!(|bytes| {
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let shm = memfd_create(&ffi::CString::new("fuzz_load_kernel").unwrap(), 0).unwrap();
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let mut kernel_file: File = unsafe { File::from_raw_fd(shm) };
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kernel_file.write_all(&bytes).unwrap();
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kernel_file.seek(SeekFrom::Start(0)).unwrap();
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let guest_memory = GuestMemoryMmap::from_ranges(&[(GuestAddress(0), MEM_SIZE)]).unwrap();
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linux_loader::loader::elf::Elf::load(
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&guest_memory,
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None,
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&mut kernel_file,
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Some(HIGH_RAM_START),
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)
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.ok();
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});
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fn memfd_create(name: &ffi::CStr, flags: u32) -> Result<RawFd, io::Error> {
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let res = unsafe { libc::syscall(libc::SYS_memfd_create, name.as_ptr(), flags) };
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if res < 0 {
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Err(io::Error::last_os_error())
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} else {
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Ok(res as RawFd)
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}
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}
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