mirror of
https://chromium.googlesource.com/crosvm/crosvm
synced 2024-10-24 13:12:57 +00:00
506105dc0d
The new constructors are shorter and omit the bare `None` in the `anon` call sites which gave no clues to the reader what the effect of that `None` was. This should improve readability. TEST=./build_test BUG=None Change-Id: I2e34e7df9a4ccc5da50edf4e963a6a42e3d84b22 Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/1797188 Reviewed-by: Daniel Verkamp <dverkamp@chromium.org> Commit-Queue: Zach Reizner <zachr@chromium.org> Tested-by: Zach Reizner <zachr@chromium.org> Tested-by: kokoro <noreply+kokoro@google.com>
55 lines
1.8 KiB
Rust
55 lines
1.8 KiB
Rust
// Copyright 2019 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 qcow::QcowFile;
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use sys_util::SharedMemory;
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use std::fs::File;
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use std::io::{Cursor, Read, Seek, SeekFrom, Write};
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use std::mem::size_of;
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use std::panic;
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use std::process;
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use std::slice;
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// Take the first 64 bits of data as an address and the next 64 bits as data to
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// store there. The rest of the data is used as a qcow image.
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#[export_name = "LLVMFuzzerTestOneInput"]
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pub fn test_one_input(data: *const u8, size: usize) -> i32 {
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// We cannot unwind past ffi boundaries.
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panic::catch_unwind(|| {
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// Safe because the libfuzzer runtime will guarantee that `data` is at least
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// `size` bytes long and that it will be valid for the lifetime of this
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// function.
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let bytes = unsafe { slice::from_raw_parts(data, size) };
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if bytes.len() < 16 {
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// Need an address and data, each are 8 bytes.
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return;
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}
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let mut disk_image = Cursor::new(bytes);
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let addr = read_u64(&mut disk_image);
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let value = read_u64(&mut disk_image);
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let shm = SharedMemory::anon().unwrap();
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let mut disk_file: File = shm.into();
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disk_file.write_all(&bytes[16..]).unwrap();
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disk_file.seek(SeekFrom::Start(0)).unwrap();
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if let Ok(mut qcow) = QcowFile::from(disk_file) {
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if qcow.seek(SeekFrom::Start(addr)).is_ok() {
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let _ = qcow.write_all(&value.to_le_bytes());
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}
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}
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})
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.err()
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.map(|_| process::abort());
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0
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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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