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https://github.com/cloud-hypervisor/cloud-hypervisor.git
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Relying on the vm-virtio/virtio-queue crate from rust-vmm which has been copied inside the Cloud Hypervisor tree, the entire codebase is moved to the new definition of a Queue and other related structures. The reason for this move is to follow the upstream until we get some agreement for the patches that we need on top of that to make it properly work with Cloud Hypervisor. Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
148 lines
4.2 KiB
Rust
148 lines
4.2 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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#![no_main]
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use block_util::{async_io::DiskFile, raw_sync::RawFileDiskSync};
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use libfuzzer_sys::fuzz_target;
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use seccompiler::SeccompAction;
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use std::ffi;
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use std::fs::File;
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use std::io::{self, Cursor, Read, Seek, SeekFrom};
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use std::mem::size_of;
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use std::os::unix::io::{AsRawFd, FromRawFd, RawFd};
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use std::path::PathBuf;
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use std::sync::Arc;
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use virtio_devices::{Block, VirtioDevice, VirtioInterrupt, VirtioInterruptType};
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use virtio_queue::{Queue, QueueState};
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use vm_memory::{bitmap::AtomicBitmap, Bytes, GuestAddress, GuestMemoryAtomic};
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use vmm_sys_util::eventfd::{EventFd, EFD_NONBLOCK};
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type GuestMemoryMmap = vm_memory::GuestMemoryMmap<AtomicBitmap>;
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const MEM_SIZE: u64 = 256 * 1024 * 1024;
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const DESC_SIZE: u64 = 16; // Bytes in one virtio descriptor.
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const QUEUE_SIZE: u16 = 16; // Max entries in the queue.
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const CMD_SIZE: usize = 16; // Bytes in the command.
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fuzz_target!(|bytes| {
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let size_u64 = size_of::<u64>();
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let mem = GuestMemoryMmap::from_ranges(&[(GuestAddress(0), MEM_SIZE as usize)]).unwrap();
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// The fuzz data is interpreted as:
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// starting index 8 bytes
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// command location 8 bytes
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// command 16 bytes
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// descriptors circular buffer 16 bytes * 3
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if bytes.len() < 4 * size_u64 {
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// Need an index to start.
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return;
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}
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let mut data_image = Cursor::new(bytes);
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let first_index = read_u64(&mut data_image);
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if first_index > MEM_SIZE / DESC_SIZE {
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return;
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}
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let first_offset = first_index * DESC_SIZE;
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if first_offset as usize + size_u64 > bytes.len() {
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return;
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}
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let command_addr = read_u64(&mut data_image);
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if command_addr > MEM_SIZE - CMD_SIZE as u64 {
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return;
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}
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if mem
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.write_slice(
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&bytes[2 * size_u64..(2 * size_u64) + CMD_SIZE],
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GuestAddress(command_addr as u64),
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)
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.is_err()
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{
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return;
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}
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data_image.seek(SeekFrom::Start(first_offset)).unwrap();
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let desc_table = read_u64(&mut data_image);
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if mem
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.write_slice(&bytes[32..], GuestAddress(desc_table as u64))
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.is_err()
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{
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return;
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}
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let guest_memory = GuestMemoryAtomic::new(mem);
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let mut q = Queue::<
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GuestMemoryAtomic<GuestMemoryMmap>,
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QueueState<GuestMemoryAtomic<GuestMemoryMmap>>,
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>::new(guest_memory.clone(), QUEUE_SIZE);
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q.state.ready = true;
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q.state.size = QUEUE_SIZE / 2;
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let queue_evts: Vec<EventFd> = vec![EventFd::new(0).unwrap()];
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let queue_fd = queue_evts[0].as_raw_fd();
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let queue_evt = unsafe { EventFd::from_raw_fd(libc::dup(queue_fd)) };
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let shm = memfd_create(&ffi::CString::new("fuzz").unwrap(), 0).unwrap();
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let disk_file: File = unsafe { File::from_raw_fd(shm) };
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let qcow_disk = Box::new(RawFileDiskSync::new(disk_file)) as Box<dyn DiskFile>;
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let mut block = Block::new(
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"tmp".to_owned(),
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qcow_disk,
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PathBuf::from(""),
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false,
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false,
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2,
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256,
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SeccompAction::Allow,
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None,
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EventFd::new(EFD_NONBLOCK).unwrap(),
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)
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.unwrap();
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block
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.activate(
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guest_memory,
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Arc::new(NoopVirtioInterrupt {}),
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vec![q],
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queue_evts,
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)
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.ok();
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queue_evt.write(77).unwrap(); // Rings the doorbell, any byte will do.
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});
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fn read_u64<T: Read>(readable: &mut T) -> u64 {
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let mut buf = [0u8; size_of::<u64>()];
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readable.read_exact(&mut buf[..]).unwrap();
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u64::from_le_bytes(buf)
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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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pub struct NoopVirtioInterrupt {}
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impl VirtioInterrupt for NoopVirtioInterrupt {
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fn trigger(
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&self,
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_int_type: &VirtioInterruptType,
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_queue: Option<&Queue<GuestMemoryAtomic<GuestMemoryMmap>>>,
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) -> std::result::Result<(), std::io::Error> {
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Ok(())
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}
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}
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