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
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
|
// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <stddef.h>
#include <stdint.h>
#include <memory>
#include "base/json/json_reader.h"
#include "base/logging.h"
#include "base/strings/string_piece_forward.h"
#include "base/time/tick_clock.h"
#include "base/time/time.h"
#include "net/base/backoff_entry.h"
#include "net/base/backoff_entry_serializer.h"
#include "net/base/backoff_entry_serializer_fuzzer_input.pb.h"
#include "testing/libfuzzer/proto/json_proto_converter.h"
#include "testing/libfuzzer/proto/lpm_interface.h"
#include "third_party/abseil-cpp/absl/types/optional.h"
namespace net {
namespace {
struct Environment {
Environment() { logging::SetMinLogLevel(logging::LOG_ERROR); }
};
class ProtoTranslator {
public:
explicit ProtoTranslator(const fuzz_proto::FuzzerInput& input)
: input_(input) {}
BackoffEntry::Policy policy() const {
return PolicyFromProto(input_.policy());
}
base::Time parse_time() const {
return base::Time() + base::Microseconds(input_.parse_time());
}
base::TimeTicks parse_time_ticks() const {
return base::TimeTicks() + base::Microseconds(input_.parse_time());
}
base::Time serialize_time() const {
return base::Time() + base::Microseconds(input_.serialize_time());
}
base::TimeTicks now_ticks() const {
return base::TimeTicks() + base::Microseconds(input_.now_ticks());
}
absl::optional<base::Value> serialized_entry() const {
json_proto::JsonProtoConverter converter;
std::string json_array = converter.Convert(input_.serialized_entry());
absl::optional<base::Value> value = base::JSONReader::Read(json_array);
return value;
}
private:
const fuzz_proto::FuzzerInput& input_;
static BackoffEntry::Policy PolicyFromProto(
const fuzz_proto::BackoffEntryPolicy& policy) {
BackoffEntry::Policy new_policy;
new_policy.num_errors_to_ignore = policy.num_errors_to_ignore();
new_policy.initial_delay_ms = policy.initial_delay_ms();
new_policy.multiply_factor = policy.multiply_factor();
new_policy.jitter_factor = policy.jitter_factor();
new_policy.maximum_backoff_ms = policy.maximum_backoff_ms();
new_policy.entry_lifetime_ms = policy.entry_lifetime_ms();
new_policy.always_use_initial_delay = policy.always_use_initial_delay();
return new_policy;
}
};
class MockClock : public base::TickClock {
public:
MockClock() = default;
~MockClock() override = default;
void SetNow(base::TimeTicks now) { now_ = now; }
base::TimeTicks NowTicks() const override { return now_; }
private:
base::TimeTicks now_;
};
// Tests the "deserialize-reserialize" property. Deserializes a BackoffEntry
// from JSON, reserializes it, then deserializes again. Holding time constant,
// we check that the parsed BackoffEntry values are equivalent.
void TestDeserialize(const ProtoTranslator& translator) {
// Attempt to convert the json_proto.ArrayValue to a base::Value.
absl::optional<base::Value> value = translator.serialized_entry();
if (!value)
return;
DCHECK(value->is_list());
BackoffEntry::Policy policy = translator.policy();
MockClock clock;
clock.SetNow(translator.parse_time_ticks());
// Attempt to deserialize a BackoffEntry.
std::unique_ptr<BackoffEntry> entry =
BackoffEntrySerializer::DeserializeFromList(
value->GetList(), &policy, &clock, translator.parse_time());
if (!entry)
return;
base::Value::List reserialized =
BackoffEntrySerializer::SerializeToList(*entry, translator.parse_time());
// Due to fuzzy interpretation in BackoffEntrySerializer::
// DeserializeFromList, we cannot assert that |*reserialized == *value|.
// Rather, we can deserialize |reserialized| and check that some weaker
// properties are preserved.
std::unique_ptr<BackoffEntry> entry_reparsed =
BackoffEntrySerializer::DeserializeFromList(reserialized, &policy, &clock,
translator.parse_time());
CHECK(entry_reparsed);
CHECK_EQ(entry_reparsed->failure_count(), entry->failure_count());
CHECK_LE(entry_reparsed->GetReleaseTime(), entry->GetReleaseTime());
}
// Tests the "serialize-deserialize" property. Serializes an arbitrary
// BackoffEntry to JSON, deserializes to another BackoffEntry, and checks
// equality of the two entries. Our notion of equality is *very weak* and needs
// improvement.
void TestSerialize(const ProtoTranslator& translator) {
BackoffEntry::Policy policy = translator.policy();
// Serialize the BackoffEntry.
BackoffEntry native_entry(&policy);
base::Value::List serialized = BackoffEntrySerializer::SerializeToList(
native_entry, translator.serialize_time());
MockClock clock;
clock.SetNow(translator.now_ticks());
// Deserialize it.
std::unique_ptr<BackoffEntry> deserialized_entry =
BackoffEntrySerializer::DeserializeFromList(serialized, &policy, &clock,
translator.parse_time());
// Even though SerializeToList was successful, we're not guaranteed to have a
// |deserialized_entry|. One reason deserialization may fail is if the parsed
// |absolute_release_time_us| is below zero.
if (!deserialized_entry)
return;
// TODO(dmcardle) Develop a stronger equality check for BackoffEntry.
// Note that while |BackoffEntry::GetReleaseTime| looks like an accessor, it
// returns a |value that is computed based on a random double, so it's not
// suitable for CHECK_EQ here. See |BackoffEntry::CalculateReleaseTime|.
CHECK_EQ(native_entry.failure_count(), deserialized_entry->failure_count());
}
} // namespace
DEFINE_PROTO_FUZZER(const fuzz_proto::FuzzerInput& input) {
static Environment env;
// Print the entire |input| protobuf if asked.
if (getenv("LPM_DUMP_NATIVE_INPUT")) {
std::cout << "input: " << input.DebugString();
}
ProtoTranslator translator(input);
// Skip this input if any of the time values are infinite.
if (translator.now_ticks().is_inf() || translator.parse_time().is_inf() ||
translator.serialize_time().is_inf()) {
return;
}
TestDeserialize(translator);
TestSerialize(translator);
}
} // namespace net
|
