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* Copyright (C) 2011 The Android Open Source Project
* 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
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#include <unordered_set>
#include "dex_file.h"
#include "safe_map.h"
namespace art {
class DexFileVerifier {
static bool Verify(const DexFile* dex_file, const uint8_t* begin, size_t size,
const char* location, std::string* error_msg);
const std::string& FailureReason() const {
return failure_reason_;
DexFileVerifier(const DexFile* dex_file, const uint8_t* begin, size_t size, const char* location)
: dex_file_(dex_file), begin_(begin), size_(size), location_(location),
header_(&dex_file->GetHeader()), ptr_(nullptr), previous_item_(nullptr) {
bool Verify();
bool CheckShortyDescriptorMatch(char shorty_char, const char* descriptor, bool is_return_type);
bool CheckListSize(const void* start, size_t count, size_t element_size, const char* label);
// Check a list. The head is assumed to be at *ptr, and elements to be of size element_size. If
// successful, the ptr will be moved forward the amount covered by the list.
bool CheckList(size_t element_size, const char* label, const uint8_t* *ptr);
// Checks whether the offset is zero (when size is zero) or that the offset falls within the area
// claimed by the file.
bool CheckValidOffsetAndSize(uint32_t offset, uint32_t size, const char* label);
bool CheckIndex(uint32_t field, uint32_t limit, const char* label);
bool CheckHeader();
bool CheckMap();
uint32_t ReadUnsignedLittleEndian(uint32_t size);
bool CheckAndGetHandlerOffsets(const DexFile::CodeItem* code_item,
uint32_t* handler_offsets, uint32_t handlers_size);
bool CheckClassDataItemField(uint32_t idx, uint32_t access_flags, bool expect_static);
bool CheckClassDataItemMethod(uint32_t idx, uint32_t access_flags, uint32_t code_offset,
bool expect_direct);
bool CheckPadding(size_t offset, uint32_t aligned_offset);
bool CheckEncodedValue();
bool CheckEncodedArray();
bool CheckEncodedAnnotation();
bool CheckIntraClassDataItem();
bool CheckIntraCodeItem();
bool CheckIntraStringDataItem();
bool CheckIntraDebugInfoItem();
bool CheckIntraAnnotationItem();
bool CheckIntraAnnotationsDirectoryItem();
bool CheckIntraSectionIterate(size_t offset, uint32_t count, uint16_t type);
bool CheckIntraIdSection(size_t offset, uint32_t count, uint16_t type);
bool CheckIntraDataSection(size_t offset, uint32_t count, uint16_t type);
bool CheckIntraSection();
bool CheckOffsetToTypeMap(size_t offset, uint16_t type);
// Note: as sometimes kDexNoIndex16, being 0xFFFF, is a valid return value, we need an
// additional out parameter to signal any errors loading an index.
uint16_t FindFirstClassDataDefiner(const uint8_t* ptr, bool* success);
uint16_t FindFirstAnnotationsDirectoryDefiner(const uint8_t* ptr, bool* success);
bool CheckInterStringIdItem();
bool CheckInterTypeIdItem();
bool CheckInterProtoIdItem();
bool CheckInterFieldIdItem();
bool CheckInterMethodIdItem();
bool CheckInterClassDefItem();
bool CheckInterAnnotationSetRefList();
bool CheckInterAnnotationSetItem();
bool CheckInterClassDataItem();
bool CheckInterAnnotationsDirectoryItem();
bool CheckInterSectionIterate(size_t offset, uint32_t count, uint16_t type);
bool CheckInterSection();
// Load a string by (type) index. Checks whether the index is in bounds, printing the error if
// not. If there is an error, null is returned.
const char* CheckLoadStringByIdx(uint32_t idx, const char* error_fmt);
const char* CheckLoadStringByTypeIdx(uint32_t type_idx, const char* error_fmt);
// Load a field/method Id by index. Checks whether the index is in bounds, printing the error if
// not. If there is an error, null is returned.
const DexFile::FieldId* CheckLoadFieldId(uint32_t idx, const char* error_fmt);
const DexFile::MethodId* CheckLoadMethodId(uint32_t idx, const char* error_fmt);
void ErrorStringPrintf(const char* fmt, ...)
__attribute__((__format__(__printf__, 2, 3))) COLD_ATTR;
const DexFile* const dex_file_;
const uint8_t* const begin_;
const size_t size_;
const char* const location_;
const DexFile::Header* const header_;
AllocationTrackingSafeMap<uint32_t, uint16_t, kAllocatorTagDexFileVerifier> offset_to_type_map_;
const uint8_t* ptr_;
const void* previous_item_;
std::string failure_reason_;
// Set of type ids for which there are ClassDef elements in the dex file.
std::unordered_set<decltype(DexFile::ClassDef::class_idx_)> defined_classes_;
} // namespace art