2022-09-16 20:35:09 +00:00
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// 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 std::os::unix::io::{AsRawFd, FromRawFd};
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use std::sync::Arc;
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2024-09-28 09:01:35 +00:00
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use libfuzzer_sys::fuzz_target;
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use seccompiler::SeccompAction;
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2022-09-16 20:35:09 +00:00
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use virtio_devices::{VirtioDevice, VirtioInterrupt, VirtioInterruptType};
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use virtio_queue::{Queue, QueueT};
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2024-09-29 15:22:27 +00:00
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use vm_memory::bitmap::AtomicBitmap;
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use vm_memory::{Bytes, GuestAddress, GuestMemoryAtomic};
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2022-09-16 20:35:09 +00:00
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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 QUEUE_DATA_SIZE: usize = 4;
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2022-10-04 00:08:45 +00:00
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const MEM_SIZE: usize = 512 * 1024;
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2022-09-22 23:26:27 +00:00
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const BALLOON_SIZE: u64 = 512 * 1024;
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2022-09-16 20:35:09 +00:00
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// Number of queues
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const QUEUE_NUM: usize = 3;
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// Max entries in the queue.
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2022-10-04 00:08:45 +00:00
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const QUEUE_SIZE: u16 = 64;
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2022-09-16 20:35:09 +00:00
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// Descriptor table alignment
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const DESC_TABLE_ALIGN_SIZE: u64 = 16;
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2023-08-31 13:00:19 +00:00
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// Available ring alignment
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2022-09-16 20:35:09 +00:00
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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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fuzz_target!(|bytes| {
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if bytes.len() < QUEUE_DATA_SIZE * QUEUE_NUM
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|| bytes.len() > (QUEUE_DATA_SIZE * QUEUE_NUM + MEM_SIZE)
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{
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return;
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}
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let mut balloon = virtio_devices::Balloon::new(
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"fuzzer_balloon".to_owned(),
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BALLOON_SIZE,
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true,
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true,
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SeccompAction::Allow,
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EventFd::new(EFD_NONBLOCK).unwrap(),
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2022-10-18 15:14:43 +00:00
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None,
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2022-09-16 20:35:09 +00:00
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)
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.unwrap();
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let queue_data = &bytes[..QUEUE_DATA_SIZE * QUEUE_NUM];
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let mem_bytes = &bytes[QUEUE_DATA_SIZE * QUEUE_NUM..];
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// Setup the guest memory with the input bytes
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let mem = GuestMemoryMmap::from_ranges(&[(GuestAddress(0), MEM_SIZE)]).unwrap();
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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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// 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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&queue_data[QUEUE_DATA_SIZE * 2..QUEUE_DATA_SIZE * 3]
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.try_into()
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.unwrap(),
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],
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0,
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);
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let inflate_q = queues.remove(0);
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let inflate_evt = EventFd::new(0).unwrap();
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let inflate_queue_evt = unsafe { EventFd::from_raw_fd(libc::dup(inflate_evt.as_raw_fd())) };
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let deflate_q = queues.remove(0);
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let deflate_evt = EventFd::new(0).unwrap();
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let deflate_queue_evt = unsafe { EventFd::from_raw_fd(libc::dup(deflate_evt.as_raw_fd())) };
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let reporting_q = queues.remove(0);
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let reporting_evt = EventFd::new(0).unwrap();
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let reporting_queue_evt = unsafe { EventFd::from_raw_fd(libc::dup(reporting_evt.as_raw_fd())) };
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// Kick the 'queue' events before activate the balloon device
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inflate_queue_evt.write(1).unwrap();
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deflate_queue_evt.write(1).unwrap();
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reporting_queue_evt.write(1).unwrap();
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balloon
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.activate(
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guest_memory,
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Arc::new(NoopVirtioInterrupt {}),
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vec![
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(0, inflate_q, inflate_evt),
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(1, deflate_q, deflate_evt),
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(2, reporting_q, reporting_evt),
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],
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)
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.ok();
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// Wait for the events to finish and balloon device worker thread to return
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2022-09-22 08:13:15 +00:00
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balloon.wait_for_epoll_threads();
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2022-09-16 20:35:09 +00:00
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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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macro_rules! align {
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($n:expr, $align:expr) => {{
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2024-10-18 09:22:20 +00:00
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$n.div_ceil($align) * $align
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2022-09-16 20:35:09 +00:00
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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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let mut base_addr = base_addr;
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for b in bytes {
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let mut q = Queue::new(QUEUE_SIZE).unwrap();
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let desc_table_addr = align!(base_addr, DESC_TABLE_ALIGN_SIZE);
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let avail_ring_addr = align!(desc_table_addr + DESC_TABLE_SIZE, AVAIL_RING_ALIGN_SIZE);
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let used_ring_addr = align!(avail_ring_addr + AVAIL_RING_SIZE, USED_RING_ALIGN_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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base_addr = used_ring_addr + USED_RING_SIZE;
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}
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queues
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}
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