blob: da3230a81f75de414426ca53ccc7e69e31ca922f (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <stdint.h>
#include <stdlib.h>
#include <iostream>
#include <vector>
#include "base/environment.h"
#include "base/logging.h"
#include "components/zucchini/buffer_view.h"
#include "components/zucchini/fuzzers/file_pair.pb.h"
#include "components/zucchini/patch_reader.h"
#include "components/zucchini/zucchini.h"
#include "testing/libfuzzer/proto/lpm_interface.h"
struct Environment {
Environment() {
logging::SetMinLogLevel(3); // Disable console spamming.
}
};
Environment* env = new Environment();
DEFINE_BINARY_PROTO_FUZZER(const zucchini::fuzzers::FilePair& file_pair) {
// Dump code for debugging.
if (base::Environment::Create()->HasVar("LPM_DUMP_NATIVE_INPUT")) {
std::cout << "Old File: " << file_pair.old_file() << std::endl
<< "Patch File: " << file_pair.new_or_patch_file() << std::endl;
}
// Prepare data.
zucchini::ConstBufferView old_image(
reinterpret_cast<const uint8_t*>(file_pair.old_file().data()),
file_pair.old_file().size());
zucchini::ConstBufferView patch_file(
reinterpret_cast<const uint8_t*>(file_pair.new_or_patch_file().data()),
file_pair.new_or_patch_file().size());
// Generate a patch reader.
auto patch_reader = zucchini::EnsemblePatchReader::Create(patch_file);
// Abort if the patch can't be read.
if (!patch_reader.has_value())
return;
// Create the underlying new file.
size_t new_size = patch_reader->header().new_size;
// Reject unreasonably large "new" files that fuzzed patch may specify.
if (new_size > 64 * 1024)
return;
std::vector<uint8_t> new_data(new_size);
zucchini::MutableBufferView new_image(new_data.data(), new_size);
// Fuzz target.
zucchini::Apply(old_image, *patch_reader, new_image);
// No need to check whether output exist, or if so, whether it's valid.
}
|
