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https://chromium.googlesource.com/crosvm/crosvm
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a6e7d6f139
Adds a fall-back to cros_fuzz when compiled without fuzzing enabled that will just produce a main fn entrypoint with the fuzzing code. This allows the fuzzing code to be compiled, but won't produce functional fuzzing binaries. BUG=b:265829867 FIXES=b:244631591 TEST=crosvm CQ cargo +nightly fuzz run --fuzz-dir crosvm-fuzz --features upstream-fuzz crosvm_block_fuzzer Change-Id: Ib2602aab5c5373cb2a71dca0d8419640a00c6725 Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/4167143 Commit-Queue: Dennis Kempin <denniskempin@google.com> Reviewed-by: Zihan Chen <zihanchen@google.com>
45 lines
1.4 KiB
Rust
45 lines
1.4 KiB
Rust
// Copyright 2019 The ChromiumOS Authors
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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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#![cfg(not(test))]
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#![no_main]
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use std::io::Cursor;
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use std::io::Read;
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use std::io::Seek;
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use std::io::SeekFrom;
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use std::io::Write;
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use std::mem::size_of;
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use base::FileReadWriteAtVolatile;
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use cros_fuzz::fuzz_target;
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use data_model::VolatileSlice;
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use disk::QcowFile;
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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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fuzz_target!(|bytes| {
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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 max_nesting_depth = 10;
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let mut disk_file = tempfile::tempfile().unwrap();
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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, max_nesting_depth) {
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let mut mem = value.to_le_bytes().to_owned();
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let vslice = VolatileSlice::new(&mut mem);
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let _ = qcow.write_all_at_volatile(vslice, addr);
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}
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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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