mirror of
https://github.com/cloud-hypervisor/cloud-hypervisor.git
synced 2024-08-22 07:51:16 +00:00
179 lines
5.8 KiB
Rust
179 lines
5.8 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::os::unix::io::{AsRawFd, FromRawFd};
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use std::sync::{Arc, Mutex};
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use virtio_devices::{BlocksState, Mem, 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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type GuestRegionMmap = vm_memory::GuestRegionMmap<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 VIRTIO_MEM_DATA_SIZE: usize = 2;
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const QUEUE_DATA_SIZE: usize = 4;
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// The size of the guest memory for the virtio-mem region
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const MEM_SIZE: usize = 128 * 1024 * 1024;
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// The start address of the virtio-mem region in the guest memory
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const VIRTIO_MEM_REGION_ADDRESS: u64 = 0;
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// Max entries in the queue.
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const QUEUE_SIZE: u16 = 64;
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// Descriptor table alignment
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const DESC_TABLE_ALIGN_SIZE: u64 = 16;
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// Avalable ring alignment
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const AVAIL_RING_ALIGN_SIZE: u64 = 2;
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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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// Used ring size
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const USED_RING_SIZE: u64 = 6_u64 + 8 * QUEUE_SIZE as u64;
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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 descriptor table.
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const DESC_TABLE_ADDR: u64 = align!(MEM_SIZE as u64 + GUEST_MEM_GAP, DESC_TABLE_ALIGN_SIZE);
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// Guest physical address for available ring
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const AVAIL_RING_ADDR: u64 = align!(DESC_TABLE_ADDR + DESC_TABLE_SIZE, AVAIL_RING_ALIGN_SIZE);
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// Guest physical address for used ring
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const USED_RING_ADDR: u64 = align!(AVAIL_RING_ADDR + AVAIL_RING_SIZE, USED_RING_ALIGN_SIZE);
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// Virtio-queue size in bytes
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const QUEUE_BYTES_SIZE: usize = (USED_RING_ADDR + USED_RING_SIZE - DESC_TABLE_ADDR) as usize;
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fuzz_target!(|bytes| {
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if bytes.len() < VIRTIO_MEM_DATA_SIZE + QUEUE_DATA_SIZE + QUEUE_BYTES_SIZE
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|| bytes.len() > (VIRTIO_MEM_DATA_SIZE + QUEUE_DATA_SIZE + QUEUE_BYTES_SIZE + MEM_SIZE)
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{
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return;
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}
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let virtio_mem_data = &bytes[..VIRTIO_MEM_DATA_SIZE];
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let queue_data = &bytes[VIRTIO_MEM_DATA_SIZE..VIRTIO_MEM_DATA_SIZE + QUEUE_DATA_SIZE];
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let queue_bytes = &bytes[VIRTIO_MEM_DATA_SIZE + QUEUE_DATA_SIZE
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..VIRTIO_MEM_DATA_SIZE + QUEUE_DATA_SIZE + QUEUE_BYTES_SIZE];
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let mem_bytes = &bytes[VIRTIO_MEM_DATA_SIZE + QUEUE_DATA_SIZE + QUEUE_BYTES_SIZE..];
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// Create a virtio-mem device based on the input bytes;
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let (mut virtio_mem, virtio_mem_region) =
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create_dummy_virtio_mem(virtio_mem_data.try_into().unwrap());
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// Setup the virt queue with the input bytes
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let q = setup_virt_queue(queue_data.try_into().unwrap());
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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(DESC_TABLE_ADDR), QUEUE_BYTES_SIZE), // guest region for the virt queue
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])
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.unwrap();
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if mem
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.write_slice(queue_bytes, GuestAddress(DESC_TABLE_ADDR))
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.is_err()
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{
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return;
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}
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// Add the memory region for the virtio-mem device
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let mem = mem.insert_region(virtio_mem_region).unwrap();
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if mem
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.write_slice(mem_bytes, GuestAddress(VIRTIO_MEM_REGION_ADDRESS))
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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 evt = EventFd::new(0).unwrap();
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let queue_evt = unsafe { EventFd::from_raw_fd(libc::dup(evt.as_raw_fd())) };
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// Kick the 'queue' event before activate the virtio-mem device
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queue_evt.write(1).unwrap();
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virtio_mem
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.activate(
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guest_memory,
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Arc::new(NoopVirtioInterrupt {}),
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vec![(0, q, evt)],
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)
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.ok();
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// Wait for the events to finish and virtio-mem device worker thread to return
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virtio_mem.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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// Create a dummy virtio-mem device for fuzzing purpose only
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fn create_dummy_virtio_mem(bytes: &[u8; VIRTIO_MEM_DATA_SIZE]) -> (Mem, Arc<GuestRegionMmap>) {
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let hugepages = bytes[0] % 2 != 0;
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let numa_id = if bytes[1] % 2 != 0 { Some(0) } else { None };
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let region = vmm::memory_manager::MemoryManager::create_ram_region(
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&None,
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0,
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GuestAddress(VIRTIO_MEM_REGION_ADDRESS),
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MEM_SIZE,
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false,
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false,
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hugepages,
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None,
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numa_id,
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None,
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)
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.unwrap();
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let blocks_state = Arc::new(Mutex::new(BlocksState::new(region.size() as u64)));
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(
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Mem::new(
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"fuzzer_mem".to_owned(),
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®ion,
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SeccompAction::Allow,
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numa_id.map(|i| i as u16),
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0,
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hugepages,
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EventFd::new(EFD_NONBLOCK).unwrap(),
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blocks_state.clone(),
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)
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.unwrap(),
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region,
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)
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}
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fn setup_virt_queue(bytes: &[u8; QUEUE_DATA_SIZE]) -> Queue {
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let mut q = Queue::new(QUEUE_SIZE).unwrap();
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q.set_next_avail(bytes[0] as u16); // 'u8' is enough given the 'QUEUE_SIZE' is small
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q.set_next_used(bytes[1] as u16);
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q.set_event_idx(bytes[2] % 2 != 0);
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q.set_size(bytes[3] as u16 % QUEUE_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_ready(true);
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q
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}
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