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/*
* Copyright (C) 2018 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
*
* http://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 "read_dex_file.h"
#include <fcntl.h>
#include <sys/mman.h>
#include <unistd.h>
#include <functional>
#include <string>
#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/unique_fd.h>
#include <dex/class_accessor-inl.h>
#include <dex/code_item_accessors-inl.h>
#include <dex/dex_file_loader.h>
#include <dex/dex_file.h>
static bool OpenDexFiles(void* addr, uint64_t size, std::vector<uint64_t> dex_file_offsets,
const std::function<void (const art::DexFile&, uint64_t)>& callback) {
bool result = true;
for (uint64_t offset : dex_file_offsets) {
if (offset >= size || size - offset < sizeof(art::DexFile::Header)) {
result = false;
break;
}
auto header = reinterpret_cast<art::DexFile::Header*>(static_cast<char*>(addr) + offset);
if (size - offset < header->file_size_) {
result = false;
break;
}
art::DexFileLoader loader;
std::string error;
std::unique_ptr<const art::DexFile> dex_file = loader.Open(reinterpret_cast<uint8_t*>(header),
header->file_size_, "", 0, nullptr,
false, false, &error);
if (!dex_file) {
result = false;
break;
}
callback(*dex_file, offset);
}
return result;
}
bool ReadSymbolsFromDexFileInMemory(void* addr, uint64_t size,
const std::vector<uint64_t>& dex_file_offsets,
std::vector<DexFileSymbol>* symbols) {
auto dexfile_callback = [&](const art::DexFile& dex_file, uint64_t dex_file_offset) {
for (art::ClassAccessor accessor : dex_file.GetClasses()) {
for (const art::ClassAccessor::Method& method : accessor.GetMethods()) {
art::CodeItemInstructionAccessor code = method.GetInstructions();
if (!code.HasCodeItem()) {
continue;
}
symbols->resize(symbols->size() + 1);
DexFileSymbol& symbol = symbols->back();
symbol.offset = reinterpret_cast<const uint8_t*>(code.Insns()) - dex_file.Begin() +
dex_file_offset;
symbol.len = code.InsnsSizeInBytes();
symbol.name = dex_file.PrettyMethod(method.GetIndex(), false);
}
}
};
return OpenDexFiles(addr, size, dex_file_offsets, dexfile_callback);
}
bool ReadSymbolsFromDexFile(const std::string& file_path,
const std::vector<uint64_t>& dex_file_offsets,
std::vector<DexFileSymbol>* symbols) {
android::base::unique_fd fd(TEMP_FAILURE_RETRY(open(file_path.c_str(), O_RDONLY | O_CLOEXEC)));
if (fd == -1) {
return false;
}
struct stat buf;
if (fstat(fd, &buf) == -1 || buf.st_size < 0) {
return false;
}
uint64_t file_size = buf.st_size;
void* addr = mmap(nullptr, file_size, PROT_READ, MAP_PRIVATE, fd, 0);
if (addr == MAP_FAILED) {
return false;
}
bool result = ReadSymbolsFromDexFileInMemory(addr, file_size, dex_file_offsets, symbols);
munmap(addr, file_size);
return result;
}
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