1 /*
2 * Copyright (C) 2018 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <stddef.h>
18 #include <stdint.h>
19
20 #include <algorithm>
21
22 #include "perfetto/base/logging.h"
23 #include "perfetto/ext/base/utils.h"
24 #include "perfetto/protozero/scattered_stream_null_delegate.h"
25 #include "perfetto/protozero/scattered_stream_writer.h"
26 #include "protos/perfetto/trace/ftrace/ftrace_event_bundle.pbzero.h"
27 #include "src/traced/probes/ftrace/cpu_reader.h"
28 #include "src/traced/probes/ftrace/ftrace_config_muxer.h"
29 #include "src/traced/probes/ftrace/test/cpu_reader_support.h"
30 #include "src/tracing/core/null_trace_writer.h"
31
32 namespace perfetto {
33 namespace {
34
35 uint8_t g_page[base::kPageSize];
36
37 } // namespace
38
39 using perfetto::protos::pbzero::FtraceEventBundle;
40
41 void FuzzCpuReaderParsePage(const uint8_t* data, size_t size);
42 void FuzzCpuReaderProcessPagesForDataSource(const uint8_t* data, size_t size);
43
44 // TODO(rsavitski): make the fuzzer generate multi-page payloads.
FuzzCpuReaderProcessPagesForDataSource(const uint8_t * data,size_t size)45 void FuzzCpuReaderProcessPagesForDataSource(const uint8_t* data, size_t size) {
46 ProtoTranslationTable* table = GetTable("synthetic");
47 if (!table) {
48 PERFETTO_FATAL(
49 "Could not read table. "
50 "This fuzzer must be run in the root directory.");
51 }
52 memset(g_page, 0, base::kPageSize);
53 memcpy(g_page, data, std::min(base::kPageSize, size));
54
55 FtraceMetadata metadata{};
56 FtraceDataSourceConfig ds_config{EventFilter{},
57 DisabledCompactSchedConfigForTesting(),
58 {},
59 {},
60 /*symbolize_ksyms=*/false};
61 ds_config.event_filter.AddEnabledEvent(
62 table->EventToFtraceId(GroupAndName("sched", "sched_switch")));
63 ds_config.event_filter.AddEnabledEvent(
64 table->EventToFtraceId(GroupAndName("ftrace", "print")));
65
66 NullTraceWriter null_writer;
67 CpuReader::ProcessPagesForDataSource(&null_writer, &metadata, /*cpu=*/0,
68 &ds_config, g_page, /*pages_read=*/1,
69 table, /*symbolizer*/ nullptr);
70 }
71
72 } // namespace perfetto
73
74 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size);
75
LLVMFuzzerTestOneInput(const uint8_t * data,size_t size)76 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
77 perfetto::FuzzCpuReaderProcessPagesForDataSource(data, size);
78 return 0;
79 }
80