mirror of
https://github.com/cloud-hypervisor/cloud-hypervisor.git
synced 2024-08-23 08:21:15 +00:00
195 lines
6.4 KiB
Rust
195 lines
6.4 KiB
Rust
// Copyright © 2022 Intel Corporation
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//
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// SPDX-License-Identifier: Apache-2.0
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#![no_main]
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use libfuzzer_sys::fuzz_target;
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use seccompiler::SeccompAction;
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use std::fs::File;
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use std::io::Write;
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use std::os::unix::io::{AsRawFd, FromRawFd, RawFd};
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use std::sync::Arc;
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use virtio_devices::{VirtioDevice, VirtioInterrupt, VirtioInterruptType};
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use virtio_queue::{Queue, QueueT};
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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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macro_rules! align {
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($n:expr, $align:expr) => {{
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(($n + $align - 1) / $align) * $align
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}};
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}
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const CONSOLE_INPUT_SIZE: usize = 128;
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const QUEUE_DATA_SIZE: usize = 4;
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const MEM_SIZE: usize = 32 * 1024 * 1024;
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// Guest memory gap
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const GUEST_MEM_GAP: u64 = 1 * 1024 * 1024;
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// Guest physical address for the first virt queue
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const BASE_VIRT_QUEUE_ADDR: u64 = MEM_SIZE as u64 + GUEST_MEM_GAP;
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// Number of queues
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const QUEUE_NUM: usize = 2;
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// Max entries in the queue.
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const QUEUE_SIZE: u16 = 256;
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// Descriptor table alignment
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const DESC_TABLE_ALIGN_SIZE: u64 = 16;
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// Used ring alignment
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const USED_RING_ALIGN_SIZE: u64 = 4;
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// Descriptor table size
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const DESC_TABLE_SIZE: u64 = 16_u64 * QUEUE_SIZE as u64;
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// Available ring size
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const AVAIL_RING_SIZE: u64 = 6_u64 + 2 * QUEUE_SIZE as u64;
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// Padding size before used ring
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const PADDING_SIZE: u64 = align!(AVAIL_RING_SIZE, USED_RING_ALIGN_SIZE) - AVAIL_RING_SIZE;
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// Used ring size
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const USED_RING_SIZE: u64 = 6_u64 + 8 * QUEUE_SIZE as u64;
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// Virtio-queue size in bytes
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const QUEUE_BYTES_SIZE: usize = align!(
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DESC_TABLE_SIZE + AVAIL_RING_SIZE + PADDING_SIZE + USED_RING_SIZE,
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DESC_TABLE_ALIGN_SIZE
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) as usize;
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fuzz_target!(|bytes| {
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if bytes.len() < (QUEUE_DATA_SIZE + QUEUE_BYTES_SIZE) * QUEUE_NUM + CONSOLE_INPUT_SIZE
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|| bytes.len()
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> (QUEUE_DATA_SIZE + QUEUE_BYTES_SIZE) * QUEUE_NUM + CONSOLE_INPUT_SIZE + MEM_SIZE
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{
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return;
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}
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let (pipe_rx, mut pipe_tx) = create_pipe().unwrap();
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let output = unsafe {
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File::from_raw_fd(
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memfd_create(&std::ffi::CString::new("fuzz_console_output").unwrap()).unwrap(),
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)
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};
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let endpoint = virtio_devices::Endpoint::FilePair(output, pipe_rx);
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let (mut console, _) = virtio_devices::Console::new(
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"fuzzer_console".to_owned(),
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endpoint,
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None, // resize_pipe
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false, // iommu
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SeccompAction::Allow,
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EventFd::new(EFD_NONBLOCK).unwrap(),
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None,
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)
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.unwrap();
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let console_input_bytes = &bytes[..CONSOLE_INPUT_SIZE];
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let queue_data = &bytes[CONSOLE_INPUT_SIZE..CONSOLE_INPUT_SIZE + QUEUE_DATA_SIZE * QUEUE_NUM];
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let queue_bytes = &bytes[CONSOLE_INPUT_SIZE + QUEUE_DATA_SIZE * QUEUE_NUM
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..CONSOLE_INPUT_SIZE + (QUEUE_DATA_SIZE + QUEUE_BYTES_SIZE) * QUEUE_NUM];
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let mem_bytes = &bytes[CONSOLE_INPUT_SIZE + (QUEUE_DATA_SIZE + QUEUE_BYTES_SIZE) * QUEUE_NUM..];
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// Setup the virt queues with the input bytes
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let mut queues = setup_virt_queues(
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&[
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&queue_data[..QUEUE_DATA_SIZE].try_into().unwrap(),
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&queue_data[QUEUE_DATA_SIZE..QUEUE_DATA_SIZE * 2]
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.try_into()
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.unwrap(),
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],
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BASE_VIRT_QUEUE_ADDR,
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);
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// Setup the guest memory with the input bytes
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let mem = GuestMemoryMmap::from_ranges(&[
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(GuestAddress(0), MEM_SIZE),
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(GuestAddress(BASE_VIRT_QUEUE_ADDR), queue_bytes.len()),
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])
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.unwrap();
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if mem
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.write_slice(queue_bytes, GuestAddress(BASE_VIRT_QUEUE_ADDR))
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.is_err()
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{
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return;
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}
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if mem.write_slice(mem_bytes, GuestAddress(0 as u64)).is_err() {
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return;
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}
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let guest_memory = GuestMemoryAtomic::new(mem);
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let input_queue = queues.remove(0);
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let input_evt = EventFd::new(0).unwrap();
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let input_queue_evt = unsafe { EventFd::from_raw_fd(libc::dup(input_evt.as_raw_fd())) };
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let output_queue = queues.remove(0);
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let output_evt = EventFd::new(0).unwrap();
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let output_queue_evt = unsafe { EventFd::from_raw_fd(libc::dup(output_evt.as_raw_fd())) };
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// Kick the 'queue' events and endpoint event before activate the console device
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input_queue_evt.write(1).unwrap();
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output_queue_evt.write(1).unwrap();
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pipe_tx.write_all(console_input_bytes).unwrap(); // To use fuzzed data;
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console
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.activate(
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guest_memory,
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Arc::new(NoopVirtioInterrupt {}),
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vec![(0, input_queue, input_evt), (1, output_queue, output_evt)],
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)
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.unwrap();
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// Wait for the events to finish and console device worker thread to return
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console.wait_for_epoll_threads();
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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(&self, _int_type: VirtioInterruptType) -> std::result::Result<(), std::io::Error> {
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Ok(())
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}
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}
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fn setup_virt_queues(bytes: &[&[u8; QUEUE_DATA_SIZE]], base_addr: u64) -> Vec<Queue> {
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let mut queues = Vec::new();
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for (i, b) in bytes.iter().enumerate() {
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let mut q = Queue::new(QUEUE_SIZE).unwrap();
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let desc_table_addr = base_addr + (QUEUE_BYTES_SIZE * i) as u64;
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let avail_ring_addr = desc_table_addr + DESC_TABLE_SIZE;
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let used_ring_addr = avail_ring_addr + PADDING_SIZE + AVAIL_RING_SIZE;
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q.try_set_desc_table_address(GuestAddress(desc_table_addr))
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.unwrap();
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q.try_set_avail_ring_address(GuestAddress(avail_ring_addr))
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.unwrap();
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q.try_set_used_ring_address(GuestAddress(used_ring_addr))
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.unwrap();
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q.set_next_avail(b[0] as u16); // 'u8' is enough given the 'QUEUE_SIZE' is small
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q.set_next_used(b[1] as u16);
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q.set_event_idx(b[2] % 2 != 0);
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q.set_size(b[3] as u16 % QUEUE_SIZE);
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q.set_ready(true);
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queues.push(q);
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}
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queues
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}
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fn memfd_create(name: &std::ffi::CStr) -> Result<RawFd, std::io::Error> {
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let res = unsafe { libc::syscall(libc::SYS_memfd_create, name.as_ptr(), 0) };
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if res < 0 {
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Err(std::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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fn create_pipe() -> Result<(File, File), std::io::Error> {
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let mut pipe = [-1; 2];
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if unsafe { libc::pipe2(pipe.as_mut_ptr(), libc::O_CLOEXEC) } == -1 {
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return Err(std::io::Error::last_os_error());
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}
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let rx = unsafe { File::from_raw_fd(pipe[0]) };
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let tx = unsafe { File::from_raw_fd(pipe[1]) };
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Ok((rx, tx))
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}
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