mirror of
https://chromium.googlesource.com/crosvm/crosvm
synced 2024-11-25 13:23:08 +00:00
413f854564
- Add an address space region for the protected KVM firmware. - Query firmware size, mmap something that size and create a memslot. BUG=b:163789172 TEST=cargo test Change-Id: I054cf5d763c980d073c17bce70e85a781816b64d Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/2623942 Auto-Submit: Andrew Walbran <qwandor@google.com> Reviewed-by: Dylan Reid <dgreid@chromium.org> Commit-Queue: Andrew Walbran <qwandor@google.com> Tested-by: kokoro <noreply+kokoro@google.com>
107 lines
2.9 KiB
Rust
107 lines
2.9 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 std::io::{Cursor, Read, Seek, SeekFrom};
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use std::mem::size_of;
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use std::sync::atomic::AtomicUsize;
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use std::sync::Arc;
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use base::Event;
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use cros_fuzz::fuzz_target;
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use devices::virtio::{base_features, Block, Interrupt, Queue, VirtioDevice};
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use devices::ProtectionType;
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use tempfile;
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use vm_memory::{GuestAddress, GuestMemory};
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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 = GuestMemory::new(&[(GuestAddress(0), MEM_SIZE)]).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_all_at_addr(
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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_all_at_addr(&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 mut q = Queue::new(QUEUE_SIZE);
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q.ready = true;
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q.size = QUEUE_SIZE / 2;
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q.max_size = QUEUE_SIZE;
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let queue_evts: Vec<Event> = vec![Event::new().unwrap()];
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let queue_evt = queue_evts[0].try_clone().unwrap();
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let features = base_features(ProtectionType::Unprotected);
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let disk_file = tempfile::tempfile().unwrap();
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let mut block =
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Block::new(features, Box::new(disk_file), false, true, 512, None, None).unwrap();
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block.activate(
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mem,
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Interrupt::new(
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Arc::new(AtomicUsize::new(0)),
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Event::new().unwrap(),
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Event::new().unwrap(),
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None, // msix_config
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0xFFFF, // VIRTIO_MSI_NO_VECTOR
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),
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vec![q],
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queue_evts,
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);
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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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