2 * Copyright (C) 2011 The Android Open Source Project
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 #ifndef ART_RUNTIME_DEX_FILE_VERIFIER_H_
18 #define ART_RUNTIME_DEX_FILE_VERIFIER_H_
20 #include <unordered_set>
27 class DexFileVerifier {
29 static bool Verify(const DexFile* dex_file, const uint8_t* begin, size_t size,
30 const char* location, std::string* error_msg);
32 const std::string& FailureReason() const {
33 return failure_reason_;
37 DexFileVerifier(const DexFile* dex_file, const uint8_t* begin, size_t size, const char* location)
38 : dex_file_(dex_file), begin_(begin), size_(size), location_(location),
39 header_(&dex_file->GetHeader()), ptr_(nullptr), previous_item_(nullptr) {
44 bool CheckShortyDescriptorMatch(char shorty_char, const char* descriptor, bool is_return_type);
45 bool CheckListSize(const void* start, size_t count, size_t element_size, const char* label);
46 // Check a list. The head is assumed to be at *ptr, and elements to be of size element_size. If
47 // successful, the ptr will be moved forward the amount covered by the list.
48 bool CheckList(size_t element_size, const char* label, const uint8_t* *ptr);
49 // Checks whether the offset is zero (when size is zero) or that the offset falls within the area
50 // claimed by the file.
51 bool CheckValidOffsetAndSize(uint32_t offset, uint32_t size, size_t alignment, const char* label);
52 // Checks whether the size is less than the limit.
53 bool CheckSizeLimit(uint32_t size, uint32_t limit, const char* label);
54 bool CheckIndex(uint32_t field, uint32_t limit, const char* label);
59 uint32_t ReadUnsignedLittleEndian(uint32_t size);
60 bool CheckAndGetHandlerOffsets(const DexFile::CodeItem* code_item,
61 uint32_t* handler_offsets, uint32_t handlers_size);
62 bool CheckClassDataItemField(uint32_t idx,
63 uint32_t access_flags,
64 uint32_t class_access_flags,
65 uint16_t class_type_index,
67 bool CheckClassDataItemMethod(uint32_t idx,
68 uint32_t access_flags,
69 uint32_t class_access_flags,
70 uint16_t class_type_index,
72 std::unordered_set<uint32_t>* direct_method_indexes,
74 bool CheckOrderAndGetClassFlags(bool is_field,
75 const char* type_descr,
79 uint16_t* class_type_index,
80 uint32_t* class_access_flags);
82 bool CheckPadding(size_t offset, uint32_t aligned_offset);
83 bool CheckEncodedValue();
84 bool CheckEncodedArray();
85 bool CheckEncodedAnnotation();
87 bool CheckIntraClassDataItem();
88 // Check all fields of the given type from the given iterator. Load the class data from the first
89 // field, if necessary (and return it), or use the given values.
90 template <bool kStatic>
91 bool CheckIntraClassDataItemFields(ClassDataItemIterator* it,
93 uint16_t* class_type_index,
94 uint32_t* class_access_flags);
95 // Check all methods of the given type from the given iterator. Load the class data from the first
96 // method, if necessary (and return it), or use the given values.
97 template <bool kDirect>
98 bool CheckIntraClassDataItemMethods(ClassDataItemIterator* it,
99 std::unordered_set<uint32_t>* direct_method_indexes,
101 uint16_t* class_type_index,
102 uint32_t* class_access_flags);
104 bool CheckIntraCodeItem();
105 bool CheckIntraStringDataItem();
106 bool CheckIntraDebugInfoItem();
107 bool CheckIntraAnnotationItem();
108 bool CheckIntraAnnotationsDirectoryItem();
110 bool CheckIntraSectionIterate(size_t offset, uint32_t count, uint16_t type);
111 bool CheckIntraIdSection(size_t offset, uint32_t count, uint16_t type);
112 bool CheckIntraDataSection(size_t offset, uint32_t count, uint16_t type);
113 bool CheckIntraSection();
115 bool CheckOffsetToTypeMap(size_t offset, uint16_t type);
117 // Note: as sometimes kDexNoIndex16, being 0xFFFF, is a valid return value, we need an
118 // additional out parameter to signal any errors loading an index.
119 uint16_t FindFirstClassDataDefiner(const uint8_t* ptr, bool* success);
120 uint16_t FindFirstAnnotationsDirectoryDefiner(const uint8_t* ptr, bool* success);
122 bool CheckInterStringIdItem();
123 bool CheckInterTypeIdItem();
124 bool CheckInterProtoIdItem();
125 bool CheckInterFieldIdItem();
126 bool CheckInterMethodIdItem();
127 bool CheckInterClassDefItem();
128 bool CheckInterAnnotationSetRefList();
129 bool CheckInterAnnotationSetItem();
130 bool CheckInterClassDataItem();
131 bool CheckInterAnnotationsDirectoryItem();
133 bool CheckInterSectionIterate(size_t offset, uint32_t count, uint16_t type);
134 bool CheckInterSection();
136 // Load a string by (type) index. Checks whether the index is in bounds, printing the error if
137 // not. If there is an error, null is returned.
138 const char* CheckLoadStringByIdx(uint32_t idx, const char* error_fmt);
139 const char* CheckLoadStringByTypeIdx(uint32_t type_idx, const char* error_fmt);
141 // Load a field/method Id by index. Checks whether the index is in bounds, printing the error if
142 // not. If there is an error, null is returned.
143 const DexFile::FieldId* CheckLoadFieldId(uint32_t idx, const char* error_fmt);
144 const DexFile::MethodId* CheckLoadMethodId(uint32_t idx, const char* error_fmt);
146 void ErrorStringPrintf(const char* fmt, ...)
147 __attribute__((__format__(__printf__, 2, 3))) COLD_ATTR;
149 // Retrieve class index and class access flag from the given member. index is the member index,
150 // which is taken as either a field or a method index (as designated by is_field). The result,
151 // if the member and declaring class could be found, is stored in class_type_index and
152 // class_access_flags.
153 // This is an expensive lookup, as we have to find the class-def by type index, which is a
154 // linear search. The output values should thus be cached by the caller.
155 bool FindClassFlags(uint32_t index,
157 uint16_t* class_type_index,
158 uint32_t* class_access_flags);
160 // Check validity of the given access flags, interpreted for a field in the context of a class
161 // with the given second access flags.
162 bool CheckFieldAccessFlags(uint32_t idx,
163 uint32_t field_access_flags,
164 uint32_t class_access_flags,
165 std::string* error_msg);
166 // Check validity of the given method and access flags, in the context of a class with the given
167 // second access flags.
168 bool CheckMethodAccessFlags(uint32_t method_index,
169 uint32_t method_access_flags,
170 uint32_t class_access_flags,
173 std::string* error_msg);
175 const DexFile* const dex_file_;
176 const uint8_t* const begin_;
178 const char* const location_;
179 const DexFile::Header* const header_;
181 struct OffsetTypeMapEmptyFn {
182 // Make a hash map slot empty by making the offset 0. Offset 0 is a valid dex file offset that
183 // is in the offset of the dex file header. However, we only store data section items in the
184 // map, and these are after the header.
185 void MakeEmpty(std::pair<uint32_t, uint16_t>& pair) const {
188 // Check if a hash map slot is empty.
189 bool IsEmpty(const std::pair<uint32_t, uint16_t>& pair) const {
190 return pair.first == 0;
193 struct OffsetTypeMapHashCompareFn {
194 // Hash function for offset.
195 size_t operator()(const uint32_t key) const {
198 // std::equal function for offset.
199 bool operator()(const uint32_t a, const uint32_t b) const {
203 // Map from offset to dex file type, HashMap for performance reasons.
204 AllocationTrackingHashMap<uint32_t,
206 OffsetTypeMapEmptyFn,
207 kAllocatorTagDexFileVerifier,
208 OffsetTypeMapHashCompareFn,
209 OffsetTypeMapHashCompareFn> offset_to_type_map_;
211 const void* previous_item_;
213 std::string failure_reason_;
215 // Set of type ids for which there are ClassDef elements in the dex file.
216 std::unordered_set<decltype(DexFile::ClassDef::class_idx_)> defined_classes_;
221 #endif // ART_RUNTIME_DEX_FILE_VERIFIER_H_