/proc/self/cwd/pw_protobuf/decoder_fuzzer.cc

Source
// Copyright 2022 The Pigweed Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.

#include <algorithm>
#include <cstddef>
#include <cstdint>
#include <cstring>
#include <vector>

#include "fuzz.h"
#include "pw_fuzzer/fuzzed_data_provider.h"
#include "pw_protobuf/stream_decoder.h"
#include "pw_span/span.h"
#include "pw_status/status.h"
#include "pw_status/status_with_size.h"
#include "pw_stream/memory_stream.h"
#include "pw_stream/stream.h"

namespace pw::protobuf::fuzz {
namespace {

void RecursiveFuzzedDecode(FuzzedDataProvider& provider,
                           StreamDecoder& decoder,
                           uint32_t depth = 0) {
  constexpr size_t kMaxRepeatedRead = 256;
  constexpr size_t kMaxDepth = 3;

  if (depth > kMaxDepth) {
    return;
  }
  while (provider.remaining_bytes() != 0 && decoder.Next().ok()) {
    FieldType field_type = provider.ConsumeEnum<FieldType>();
    switch (field_type) {
      case kUint32:
        if (!decoder.ReadUint32().status().ok()) {
          return;
        }
        break;
      case kPackedUint32: {
        uint32_t packed[kMaxRepeatedRead] = {0};
        if (!decoder.ReadPackedUint32(packed).status().ok()) {
          return;
        }
      } break;
      case kUint64:
        if (!decoder.ReadUint64().status().ok()) {
          return;
        }
        break;
      case kPackedUint64: {
        uint64_t packed[kMaxRepeatedRead] = {0};
        if (!decoder.ReadPackedUint64(packed).status().ok()) {
          return;
        }
      } break;
      case kInt32:
        if (!decoder.ReadInt32().status().ok()) {
          return;
        }
        break;
      case kPackedInt32: {
        int32_t packed[kMaxRepeatedRead] = {0};
        if (!decoder.ReadPackedInt32(packed).status().ok()) {
          return;
        }
      } break;
      case kInt64:
        if (!decoder.ReadInt64().status().ok()) {
          return;
        }
        break;
      case kPackedInt64: {
        int64_t packed[kMaxRepeatedRead] = {0};
        if (!decoder.ReadPackedInt64(packed).status().ok()) {
          return;
        }
      } break;
      case kSint32:
        if (!decoder.ReadSint32().status().ok()) {
          return;
        }
        break;
      case kPackedSint32: {
        int32_t packed[kMaxRepeatedRead] = {0};
        if (!decoder.ReadPackedSint32(packed).status().ok()) {
          return;
        }
      } break;
      case kSint64:
        if (!decoder.ReadSint64().status().ok()) {
          return;
        }
        break;
      case kPackedSint64: {
        int64_t packed[kMaxRepeatedRead] = {0};
        if (!decoder.ReadPackedSint64(packed).status().ok()) {
          return;
        }
      } break;
      case kBool:
        if (!decoder.ReadBool().status().ok()) {
          return;
        }
        break;
      case kFixed32:
        if (!decoder.ReadFixed32().status().ok()) {
          return;
        }
        break;
      case kPackedFixed32: {
        uint32_t packed[kMaxRepeatedRead] = {0};
        if (!decoder.ReadPackedFixed32(packed).status().ok()) {
          return;
        }
      } break;
      case kFixed64:
        if (!decoder.ReadFixed64().status().ok()) {
          return;
        }
        break;
      case kPackedFixed64: {
        uint64_t packed[kMaxRepeatedRead] = {0};
        if (!decoder.ReadPackedFixed64(packed).status().ok()) {
          return;
        }
      } break;
      case kSfixed32:
        if (!decoder.ReadSfixed32().status().ok()) {
          return;
        }
        break;
      case kPackedSfixed32: {
        int32_t packed[kMaxRepeatedRead] = {0};
        if (!decoder.ReadPackedSfixed32(packed).status().ok()) {
          return;
        }
      } break;
      case kSfixed64:
        if (!decoder.ReadSfixed64().status().ok()) {
          return;
        }
        break;
      case kPackedSfixed64: {
        int64_t packed[kMaxRepeatedRead] = {0};
        if (!decoder.ReadPackedSfixed64(packed).status().ok()) {
          return;
        }
      } break;
      case kFloat:
        if (!decoder.ReadFloat().status().ok()) {
          return;
        }
        break;
      case kPackedFloat: {
        float packed[kMaxRepeatedRead] = {0};
        if (!decoder.ReadPackedFloat(packed).status().ok()) {
          return;
        }
      } break;
      case kDouble:
        if (!decoder.ReadDouble().status().ok()) {
          return;
        }
        break;
      case kPackedDouble: {
        double packed[kMaxRepeatedRead] = {0};
        if (!decoder.ReadPackedDouble(packed).status().ok()) {
          return;
        }
      } break;
      case kBytes: {
        std::byte bytes[kMaxRepeatedRead] = {std::byte{0}};
        if (!decoder.ReadBytes(bytes).status().ok()) {
          return;
        }
      } break;
      case kString: {
        char str[kMaxRepeatedRead] = {0};
        if (!decoder.ReadString(str).status().ok()) {
          return;
        }
      } break;
      case kPush: {
        StreamDecoder nested_decoder = decoder.GetNestedDecoder();
        RecursiveFuzzedDecode(provider, nested_decoder, depth + 1);
      } break;
      case kPop:
        if (depth > 0) {
          // Special "field". The marks the end of a nested message.
          return;
        }
    }
  }
}

void TestOneInput(FuzzedDataProvider& provider) {
  constexpr size_t kMaxFuzzedProtoSize = 4096;
  std::vector<std::byte> proto_message_data = provider.ConsumeBytes<std::byte>(
      provider.ConsumeIntegralInRange<size_t>(0, kMaxFuzzedProtoSize));
  stream::MemoryReader memory_reader(proto_message_data);
  StreamDecoder decoder(memory_reader);
  RecursiveFuzzedDecode(provider, decoder);
}

}  // namespace
}  // namespace pw::protobuf::fuzz

extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
  FuzzedDataProvider provider(data, size);
  pw::protobuf::fuzz::TestOneInput(provider);
  return 0;
}

Coverage Report

Created: 2025-11-16 06:54

Line	Count	Source
1		// Copyright 2022 The Pigweed Authors
2		//
3		// Licensed under the Apache License, Version 2.0 (the "License"); you may not
4		// use this file except in compliance with the License. You may obtain a copy of
5		// the License at
6		//
7		// https://www.apache.org/licenses/LICENSE-2.0
8		//
9		// Unless required by applicable law or agreed to in writing, software
10		// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
11		// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
12		// License for the specific language governing permissions and limitations under
13		// the License.
14
15		#include <algorithm>
16		#include <cstddef>
17		#include <cstdint>
18		#include <cstring>
19		#include <vector>
20
21		#include "fuzz.h"
22		#include "pw_fuzzer/fuzzed_data_provider.h"
23		#include "pw_protobuf/stream_decoder.h"
24		#include "pw_span/span.h"
25		#include "pw_status/status.h"
26		#include "pw_status/status_with_size.h"
27		#include "pw_stream/memory_stream.h"
28		#include "pw_stream/stream.h"
29
30		namespace pw::protobuf::fuzz {
31		namespace {
32
33		void RecursiveFuzzedDecode(FuzzedDataProvider& provider,
34		StreamDecoder& decoder,
35	5.58k	uint32_t depth = 0) {
36	5.58k	constexpr size_t kMaxRepeatedRead = 256;
37	5.58k	constexpr size_t kMaxDepth = 3;
38
39	5.58k	if (depth > kMaxDepth) {
40	781	return;
41	781	}
42	15.9k	while (provider.remaining_bytes() != 0 && decoder.Next().ok()) {
43	12.7k	FieldType field_type = provider.ConsumeEnum<FieldType>();
44	12.7k	switch (field_type) {
45	419	case kUint32:
46	419	if (!decoder.ReadUint32().status().ok()) {
47	148	return;
48	148	}
49	271	break;
50	409	case kPackedUint32: {
51	409	uint32_t packed[kMaxRepeatedRead] = {0};
52	409	if (!decoder.ReadPackedUint32(packed).status().ok()) {
53	113	return;
54	113	}
55	409	} break;
56	296	case kUint64:
57	228	if (!decoder.ReadUint64().status().ok()) {
58	29	return;
59	29	}
60	199	break;
61	370	case kPackedUint64: {
62	370	uint64_t packed[kMaxRepeatedRead] = {0};
63	370	if (!decoder.ReadPackedUint64(packed).status().ok()) {
64	68	return;
65	68	}
66	370	} break;
67	477	case kInt32:
68	477	if (!decoder.ReadInt32().status().ok()) {
69	211	return;
70	211	}
71	266	break;
72	324	case kPackedInt32: {
73	324	int32_t packed[kMaxRepeatedRead] = {0};
74	324	if (!decoder.ReadPackedInt32(packed).status().ok()) {
75	42	return;
76	42	}
77	324	} break;
78	282	case kInt64:
79	221	if (!decoder.ReadInt64().status().ok()) {
80	26	return;
81	26	}
82	195	break;
83	335	case kPackedInt64: {
84	335	int64_t packed[kMaxRepeatedRead] = {0};
85	335	if (!decoder.ReadPackedInt64(packed).status().ok()) {
86	54	return;
87	54	}
88	335	} break;
89	419	case kSint32:
90	419	if (!decoder.ReadSint32().status().ok()) {
91	138	return;
92	138	}
93	281	break;
94	505	case kPackedSint32: {
95	505	int32_t packed[kMaxRepeatedRead] = {0};
96	505	if (!decoder.ReadPackedSint32(packed).status().ok()) {
97	107	return;
98	107	}
99	505	} break;
100	398	case kSint64:
101	271	if (!decoder.ReadSint64().status().ok()) {
102	73	return;
103	73	}
104	198	break;
105	321	case kPackedSint64: {
106	321	int64_t packed[kMaxRepeatedRead] = {0};
107	321	if (!decoder.ReadPackedSint64(packed).status().ok()) {
108	38	return;
109	38	}
110	321	} break;
111	365	case kBool:
112	365	if (!decoder.ReadBool().status().ok()) {
113	169	return;
114	169	}
115	196	break;
116	455	case kFixed32:
117	455	if (!decoder.ReadFixed32().status().ok()) {
118	11	return;
119	11	}
120	444	break;
121	444	case kPackedFixed32: {
122	297	uint32_t packed[kMaxRepeatedRead] = {0};
123	297	if (!decoder.ReadPackedFixed32(packed).status().ok()) {
124	38	return;
125	38	}
126	297	} break;
127	259	case kFixed64:
128	207	if (!decoder.ReadFixed64().status().ok()) {
129	8	return;
130	8	}
131	199	break;
132	578	case kPackedFixed64: {
133	578	uint64_t packed[kMaxRepeatedRead] = {0};
134	578	if (!decoder.ReadPackedFixed64(packed).status().ok()) {
135	42	return;
136	42	}
137	578	} break;
138	536	case kSfixed32:
139	223	if (!decoder.ReadSfixed32().status().ok()) {
140	9	return;
141	9	}
142	214	break;
143	328	case kPackedSfixed32: {
144	328	int32_t packed[kMaxRepeatedRead] = {0};
145	328	if (!decoder.ReadPackedSfixed32(packed).status().ok()) {
146	42	return;
147	42	}
148	328	} break;
149	286	case kSfixed64:
150	203	if (!decoder.ReadSfixed64().status().ok()) {
151	7	return;
152	7	}
153	196	break;
154	303	case kPackedSfixed64: {
155	303	int64_t packed[kMaxRepeatedRead] = {0};
156	303	if (!decoder.ReadPackedSfixed64(packed).status().ok()) {
157	45	return;
158	45	}
159	303	} break;
160	350	case kFloat:
161	350	if (!decoder.ReadFloat().status().ok()) {
162	11	return;
163	11	}
164	339	break;
165	339	case kPackedFloat: {
166	317	float packed[kMaxRepeatedRead] = {0};
167	317	if (!decoder.ReadPackedFloat(packed).status().ok()) {
168	35	return;
169	35	}
170	317	} break;
171	282	case kDouble:
172	210	if (!decoder.ReadDouble().status().ok()) {
173	3	return;
174	3	}
175	207	break;
176	329	case kPackedDouble: {
177	329	double packed[kMaxRepeatedRead] = {0};
178	329	if (!decoder.ReadPackedDouble(packed).status().ok()) {
179	53	return;
180	53	}
181	329	} break;
182	603	case kBytes: {
183	603	std::byte bytes[kMaxRepeatedRead] = {std::byte{0}};
184	603	if (!decoder.ReadBytes(bytes).status().ok()) {
185	55	return;
186	55	}
187	603	} break;
188	548	case kString: {
189	408	char str[kMaxRepeatedRead] = {0};
190	408	if (!decoder.ReadString(str).status().ok()) {
191	57	return;
192	57	}
193	408	} break;
194	3.27k	case kPush: {
195	3.27k	StreamDecoder nested_decoder = decoder.GetNestedDecoder();
196	3.27k	RecursiveFuzzedDecode(provider, nested_decoder, depth + 1);
197	3.27k	} break;
198	0	case kPop:
199	0	if (depth > 0) {
200		// Special "field". The marks the end of a nested message.
201	0	return;
202	0	}
203	12.7k	}
204	12.7k	}
205	4.80k	}
206
207	2.31k	void TestOneInput(FuzzedDataProvider& provider) {
208	2.31k	constexpr size_t kMaxFuzzedProtoSize = 4096;
209	2.31k	std::vector<std::byte> proto_message_data = provider.ConsumeBytes<std::byte>(
210	2.31k	provider.ConsumeIntegralInRange<size_t>(0, kMaxFuzzedProtoSize));
211	2.31k	stream::MemoryReader memory_reader(proto_message_data);
212	2.31k	StreamDecoder decoder(memory_reader);
213	2.31k	RecursiveFuzzedDecode(provider, decoder);
214	2.31k	}
215
216		} // namespace
217		} // namespace pw::protobuf::fuzz
218
219	17.0k	extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
220	17.0k	FuzzedDataProvider provider(data, size);
221	17.0k	pw::protobuf::fuzz::TestOneInput(provider);
222	17.0k	return 0;
223	17.0k	}