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Following the new design proposal to improve the restore codepath when migrating a VM, all virtio devices are supplied with an optional state they can use to restore from. The restore() implementation every device was providing has been removed in order to prevent from going through the restoration twice. Here is the list of devices now following the new restore design: - Block (virtio-block) - Net (virtio-net) - Rng (virtio-rng) - Fs (vhost-user-fs) - Blk (vhost-user-block) - Net (vhost-user-net) - Pmem (virtio-pmem) - Vsock (virtio-vsock) - Mem (virtio-mem) - Balloon (virtio-balloon) - Watchdog (virtio-watchdog) - Vdpa (vDPA) - Console (virtio-console) - Iommu (virtio-iommu) Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
136 lines
4.2 KiB
Rust
136 lines
4.2 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;
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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 QUEUE_DATA_SIZE: usize = 4;
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const MEM_SIZE: usize = 1 * 1024 * 1024;
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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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// 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() < (QUEUE_DATA_SIZE + QUEUE_BYTES_SIZE)
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|| bytes.len() > (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 mut rng = virtio_devices::Rng::new(
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"fuzzer_rng".to_owned(),
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"/dev/urandom",
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false,
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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 queue_data = &bytes[..QUEUE_DATA_SIZE];
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let queue_bytes = &bytes[QUEUE_DATA_SIZE..QUEUE_DATA_SIZE + QUEUE_BYTES_SIZE];
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let mem_bytes = &bytes[QUEUE_DATA_SIZE + QUEUE_BYTES_SIZE..];
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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(0), MEM_SIZE),
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(GuestAddress(DESC_TABLE_ADDR), QUEUE_BYTES_SIZE),
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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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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 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 rng device
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queue_evt.write(1).unwrap();
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rng.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 rng device worker thread to return
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rng.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_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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