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247 lines
9.9 KiB
247 lines
9.9 KiB
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "dex_file_tracking_registrar.h"
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#include <deque>
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#include <tuple>
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#include <android-base/logging.h>
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// For dex tracking through poisoning. Note: Requires forcing sanitization. This is the reason for
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// the ifdefs and early include.
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#ifdef ART_DEX_FILE_ACCESS_TRACKING
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#ifndef ART_ENABLE_ADDRESS_SANITIZER
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#define ART_ENABLE_ADDRESS_SANITIZER
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#endif
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#endif
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#include "base/memory_tool.h"
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#include "class_accessor-inl.h"
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#include "code_item_accessors-inl.h"
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#include "dex_file-inl.h"
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namespace art {
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namespace dex {
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namespace tracking {
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// If true, poison dex files to track accesses.
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static constexpr bool kDexFileAccessTracking =
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#ifdef ART_DEX_FILE_ACCESS_TRACKING
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true;
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#else
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false;
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#endif
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// The following are configurations of poisoning certain sections of a Dex File.
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// More will be added
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enum DexTrackingType {
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// Poisons all of a Dex File when set.
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kWholeDexTracking,
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// Poisons all Code Items of a Dex File when set.
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kCodeItemTracking,
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// Poisons all subsections of a Code Item, except the Insns bytecode array
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// section, when set for all Code Items in a Dex File.
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kCodeItemNonInsnsTracking,
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// Poisons all subsections of a Code Item, except the Insns bytecode array
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// section, when set for all Code Items in a Dex File.
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// Additionally unpoisons the entire Code Item when method is a class
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// initializer.
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kCodeItemNonInsnsNoClinitTracking,
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// Poisons the size and offset information along with the first instruction.
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// This is so that accessing multiple instructions while accessing a code item
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// once will not trigger unnecessary accesses.
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kCodeItemStartTracking,
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// Poisons all String Data Items of a Dex Files when set.
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kStringDataItemTracking,
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// Poisons the first byte of the utf16_size value and the first byte of the
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// data section for all String Data Items of a Dex File.
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kStringDataItemStartTracking,
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// Poisons based on a custom tracking system which can be specified in
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// SetDexSections
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kCustomTracking,
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};
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// Intended for local changes only.
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// Represents the current configuration being run.
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static constexpr DexTrackingType kCurrentTrackingSystem = kWholeDexTracking;
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// Intended for local changes only.
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void DexFileTrackingRegistrar::SetDexSections() {
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if (kDexFileAccessTracking && dex_file_ != nullptr) {
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// Logs the Dex File's location and starting address if tracking is enabled
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LOG(ERROR) << "RegisterDexFile: " << dex_file_->GetLocation() + " @ " << std::hex
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<< reinterpret_cast<uintptr_t>(dex_file_->Begin());
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switch (kCurrentTrackingSystem) {
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case kWholeDexTracking:
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SetDexFileRegistration(true);
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break;
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case kCodeItemTracking:
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SetAllCodeItemRegistration(true);
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break;
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case kCodeItemNonInsnsTracking:
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SetAllCodeItemRegistration(true);
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SetAllInsnsRegistration(false);
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break;
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case kCodeItemNonInsnsNoClinitTracking:
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SetAllCodeItemRegistration(true);
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SetAllInsnsRegistration(false);
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SetCodeItemRegistration("<clinit>", false);
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break;
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case kCodeItemStartTracking:
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SetAllCodeItemStartRegistration(true);
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break;
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case kStringDataItemTracking:
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SetAllStringDataRegistration(true);
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break;
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case kStringDataItemStartTracking:
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SetAllStringDataStartRegistration(true);
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break;
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case kCustomTracking:
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// TODO: Add/remove additional calls here to (un)poison sections of
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// dex_file_
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break;
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default:
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break;
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}
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}
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}
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void RegisterDexFile(const DexFile* dex_file) {
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DexFileTrackingRegistrar dex_tracking_registrar(dex_file);
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dex_tracking_registrar.SetDexSections();
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dex_tracking_registrar.SetCurrentRanges();
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}
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inline void SetRegistrationRange(const void* begin, size_t size, bool should_poison) {
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if (should_poison) {
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MEMORY_TOOL_MAKE_NOACCESS(begin, size);
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} else {
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// Note: MEMORY_TOOL_MAKE_UNDEFINED has the same functionality with Address
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// Sanitizer.
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// Historical note: The difference has not been tested with Valgrind.
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MEMORY_TOOL_MAKE_DEFINED(begin, size);
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}
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}
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void DexFileTrackingRegistrar::SetCurrentRanges() {
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// This also empties range_values_ to avoid redundant (un)poisoning upon
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// subsequent calls.
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while (!range_values_.empty()) {
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const std::tuple<const void*, size_t, bool>& current_range = range_values_.front();
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SetRegistrationRange(std::get<0>(current_range),
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std::get<1>(current_range),
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std::get<2>(current_range));
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range_values_.pop_front();
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}
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}
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void DexFileTrackingRegistrar::SetDexFileRegistration(bool should_poison) {
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const void* dex_file_begin = reinterpret_cast<const void*>(dex_file_->Begin());
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size_t dex_file_size = dex_file_->Size();
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range_values_.push_back(std::make_tuple(dex_file_begin, dex_file_size, should_poison));
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}
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void DexFileTrackingRegistrar::SetAllCodeItemRegistration(bool should_poison) {
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for (ClassAccessor accessor : dex_file_->GetClasses()) {
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for (const ClassAccessor::Method& method : accessor.GetMethods()) {
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const dex::CodeItem* code_item = method.GetCodeItem();
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if (code_item != nullptr) {
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const void* code_item_begin = reinterpret_cast<const void*>(code_item);
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size_t code_item_size = dex_file_->GetCodeItemSize(*code_item);
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range_values_.push_back(std::make_tuple(code_item_begin, code_item_size, should_poison));
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}
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}
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}
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}
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void DexFileTrackingRegistrar::SetAllCodeItemStartRegistration(bool should_poison) {
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for (ClassAccessor class_accessor : dex_file_->GetClasses()) {
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for (const ClassAccessor::Method& method : class_accessor.GetMethods()) {
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const dex::CodeItem* code_item = method.GetCodeItem();
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if (code_item != nullptr) {
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const void* code_item_begin = reinterpret_cast<const void*>(code_item);
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size_t code_item_start = reinterpret_cast<size_t>(code_item);
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CodeItemInstructionAccessor accessor(*dex_file_, code_item);
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size_t code_item_start_end = reinterpret_cast<size_t>(accessor.Insns());
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size_t code_item_start_size = code_item_start_end - code_item_start;
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range_values_.push_back(std::make_tuple(code_item_begin,
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code_item_start_size,
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should_poison));
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}
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}
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}
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}
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void DexFileTrackingRegistrar::SetAllInsnsRegistration(bool should_poison) {
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for (ClassAccessor class_accessor : dex_file_->GetClasses()) {
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for (const ClassAccessor::Method& method : class_accessor.GetMethods()) {
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const dex::CodeItem* code_item = method.GetCodeItem();
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if (code_item != nullptr) {
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CodeItemInstructionAccessor accessor(*dex_file_, code_item);
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const void* insns_begin = reinterpret_cast<const void*>(accessor.Insns());
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// Member insns_size_in_code_units_ is in 2-byte units
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size_t insns_size = accessor.InsnsSizeInCodeUnits() * 2;
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range_values_.push_back(std::make_tuple(insns_begin, insns_size, should_poison));
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}
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}
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}
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}
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void DexFileTrackingRegistrar::SetCodeItemRegistration(const char* class_name, bool should_poison) {
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for (ClassAccessor accessor : dex_file_->GetClasses()) {
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for (const ClassAccessor::Method& method : accessor.GetMethods()) {
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const dex::MethodId& methodid_item = dex_file_->GetMethodId(method.GetIndex());
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const char * methodid_name = dex_file_->GetMethodName(methodid_item);
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const dex::CodeItem* code_item = method.GetCodeItem();
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if (code_item != nullptr && strcmp(methodid_name, class_name) == 0) {
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const void* code_item_begin = reinterpret_cast<const void*>(code_item);
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size_t code_item_size = dex_file_->GetCodeItemSize(*code_item);
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range_values_.push_back(std::make_tuple(code_item_begin, code_item_size, should_poison));
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}
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}
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}
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}
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void DexFileTrackingRegistrar::SetAllStringDataStartRegistration(bool should_poison) {
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for (size_t stringid_ctr = 0; stringid_ctr < dex_file_->NumStringIds(); ++stringid_ctr) {
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const dex::StringId & string_id = dex_file_->GetStringId(StringIndex(stringid_ctr));
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const void* string_data_begin = reinterpret_cast<const void*>(dex_file_->Begin() + string_id.string_data_off_);
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// Data Section of String Data Item
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const void* string_data_data_begin = reinterpret_cast<const void*>(dex_file_->GetStringData(string_id));
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range_values_.push_back(std::make_tuple(string_data_begin, 1, should_poison));
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range_values_.push_back(std::make_tuple(string_data_data_begin, 1, should_poison));
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}
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}
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void DexFileTrackingRegistrar::SetAllStringDataRegistration(bool should_poison) {
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size_t map_offset = dex_file_->GetHeader().map_off_;
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auto map_list = reinterpret_cast<const dex::MapList*>(dex_file_->Begin() + map_offset);
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for (size_t map_ctr = 0; map_ctr < map_list->size_; ++map_ctr) {
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const dex::MapItem& map_item = map_list->list_[map_ctr];
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if (map_item.type_ == DexFile::kDexTypeStringDataItem) {
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const dex::MapItem& next_map_item = map_list->list_[map_ctr + 1];
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const void* string_data_begin = reinterpret_cast<const void*>(dex_file_->Begin() + map_item.offset_);
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size_t string_data_size = next_map_item.offset_ - map_item.offset_;
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range_values_.push_back(std::make_tuple(string_data_begin, string_data_size, should_poison));
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}
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}
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}
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} // namespace tracking
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} // namespace dex
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} // namespace art
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