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Side by Side Diff: third_party/WebKit/Source/platform/TextCodecFuzzer.cpp

Issue 2731643002: Fuzzer for TextCodecs (Closed)
Patch Set: fix things up Created 3 years, 9 months ago
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1 // Copyright 2017 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "wtf/text/TextCodec.h"
6
7 #include "platform/testing/BlinkFuzzerTestSupport.h"
8 #include "platform/testing/FuzzedDataProvider.h"
9 #include "wtf/text/CString.h"
10 #include "wtf/text/TextEncoding.h"
11 #include "wtf/text/TextEncodingRegistry.h"
12
13 using namespace blink;
14
15 // TODO(jsbell): This fuzzes code in wtf/ but has dependencies on platform/,
16 // so it must live in the latter directory. Once wtf/ moves into platform/wtf
17 // this should move there as well.
18
19 WTF::FlushBehavior kFlushBehavior[] = {WTF::DoNotFlush, WTF::FetchEOF,
20 WTF::DataEOF};
21
22 WTF::UnencodableHandling kUnencodableHandlingOptions[] = {
23 WTF::QuestionMarksForUnencodables, WTF::EntitiesForUnencodables,
24 WTF::URLEncodedEntitiesForUnencodables,
25 WTF::CSSEncodedEntitiesForUnencodables};
26
27 class TextCodecFuzzHarness {};
28 extern "C" int LLVMFuzzerInitialize(int* argc, char*** argv) {
29 InitializeBlinkFuzzTest(argc, argv);
30 return 0;
31 }
32
33 // Fuzzer for WTF::TextCodec.
34 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
35 // The fuzzer picks 3 bytes off the end of the data to initialize metadata, so
36 // abort if the input is smaller than that.
37 if (size < 3)
38 return 0;
39
40 // Initializes the codec map.
41 static WTF::TextEncoding encoding =
mmoroz 2017/03/05 19:09:46 nit: can be const?
Charlie Harrison 2017/03/06 01:51:11 Done.
42 WTF::TextEncoding(atomicCanonicalTextEncodingName(
43 #if defined(BIG5)
44 "Big5"
45 #elif defined(EUC_JP)
46 "EUC-JP"
47 #elif defined(EUC_KR)
48 "EUC-KR"
49 #elif defined(GBK)
50 "GBK"
51 #elif defined(IBM866)
52 "IBM866"
53 #elif defined(ISO_2022_JP)
54 "ISO-2022-JP"
55 #elif defined(ISO_8859_10)
56 "ISO-8859-10"
57 #elif defined(ISO_8859_13)
58 "ISO-8859-13"
59 #elif defined(ISO_8859_14)
60 "ISO-8859-14"
61 #elif defined(ISO_8859_15)
62 "ISO-8859-15"
63 #elif defined(ISO_8859_16)
64 "ISO-8859-16"
65 #elif defined(ISO_8859_2)
66 "ISO-8859-2"
67 #elif defined(ISO_8859_3)
68 "ISO-8859-3"
69 #elif defined(ISO_8859_4)
70 "ISO-8859-4"
71 #elif defined(ISO_8859_5)
72 "ISO-8859-5"
73 #elif defined(ISO_8859_6)
74 "ISO-8859-6"
75 #elif defined(ISO_8859_7)
76 "ISO-8859-7"
77 #elif defined(ISO_8859_8)
78 "ISO-8859-8"
79 #elif defined(ISO_8859_8_I)
80 "ISO-8859-8-I"
81 #elif defined(KOI8_R)
82 "KOI8-R"
83 #elif defined(KOI8_U)
84 "KOI8-U"
85 #elif defined(SHIFT_JIS)
86 "Shift_JIS"
87 #elif defined(UTF_16BE)
88 "UTF-16BE"
89 #elif defined(UTF_16LE)
90 "UTF-16LE"
91 #elif defined(UTF_32)
92 "UTF-32"
93 #elif defined(UTF_32BE)
94 "UTF-32BE"
95 #elif defined(UTF_32LE)
96 "UTF-32LE"
97 #elif defined(UTF_8)
98 "UTF-8"
99 #elif defined(GB18030)
100 "gb18030"
101 #elif defined(MACINTOSH)
102 "macintosh"
103 #elif defined(WINDOWS_1250)
104 "windows-1250"
105 #elif defined(WINDOWS_1251)
106 "windows-1251"
107 #elif defined(WINDOWS_1252)
108 "windows-1252"
109 #elif defined(WINDOWS_1253)
110 "windows-1253"
111 #elif defined(WINDOWS_1254)
112 "windows-1254"
113 #elif defined(WINDOWS_1255)
114 "windows-1255"
115 #elif defined(WINDOWS_1256)
116 "windows-1256"
117 #elif defined(WINDOWS_1257)
118 "windows-1257"
119 #elif defined(WINDOWS_1258)
120 "windows-1258"
121 #elif defined(WINDOWS_874)
122 "windows-874"
123 #elif defined(X_MAC_CYRILLIC)
124 "x-mac-cyrillic"
125 #elif defined(X_USER_DEFINED)
126 "x-user-defined"
127 #endif
128 ""));
129
130 FuzzedDataProvider fuzzedData(data, size);
131
132 // Initialize metadata using the fuzzed data.
133 bool stopOnError = fuzzedData.ConsumeBool();
134 WTF::UnencodableHandling unencodableHandling =
135 fuzzedData.PickValueInArray(kUnencodableHandlingOptions);
136 WTF::FlushBehavior flushBehavior =
137 fuzzedData.PickValueInArray(kFlushBehavior);
138
139 // Now, use the rest of the fuzzy data to stress test decoding and encoding.
140 CString byteString = fuzzedData.ConsumeRemainingBytes();
mmoroz 2017/03/05 19:09:45 nit: can it be const?
Charlie Harrison 2017/03/06 01:51:11 Done.
141 std::unique_ptr<TextCodec> codec = newTextCodec(encoding);
142
143 // Treat as bytes-off-the-wire.
144 bool sawError;
145 codec->decode(byteString.data(), byteString.length(), flushBehavior,
146 stopOnError, sawError);
147
148 // Treat as blink 8-bit string (latin1).
149 if (size % sizeof(LChar) == 0) {
150 std::unique_ptr<TextCodec> codec = newTextCodec(encoding);
mmoroz 2017/03/05 19:09:45 Do we really need to create a new codec object her
Charlie Harrison 2017/03/06 01:51:11 I think it does need to be different. It looks lik
151 codec->encode(reinterpret_cast<const LChar*>(byteString.data()),
152 byteString.length() / sizeof(LChar), unencodableHandling);
153 }
154
155 // Treat as blink 16-bit string (utf-16) if there are an even number of bytes.
156 if (size % sizeof(UChar) == 0) {
157 std::unique_ptr<TextCodec> codec = newTextCodec(encoding);
158 codec->encode(reinterpret_cast<const UChar*>(byteString.data()),
159 byteString.length() / sizeof(UChar), unencodableHandling);
160 }
161
162 return 0;
163 }
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