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/*
* Copyright (C) 2015 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_elf.h"
#include <gtest/gtest.h>
#include <map>
#include <android-base/file.h>
#include "get_test_data.h"
#include "test_util.h"
#include "utils.h"
#define ELF_NOTE_GNU "GNU"
#define NT_GNU_BUILD_ID 3
using namespace simpleperf;
TEST(read_elf, GetBuildIdFromNoteSection) {
BuildId build_id;
std::vector<char> data;
// Fail to read build id for no data.
ASSERT_FALSE(GetBuildIdFromNoteSection(data.data(), 0, &build_id));
// Read build id from data starting from different alignment addresses.
char build_id_data[20];
for (int i = 0; i < 20; ++i) {
build_id_data[i] = i;
}
BuildId expected_build_id(build_id_data, 20);
data.resize(100, '\0');
for (size_t alignment = 0; alignment <= 3; ++alignment) {
char* start = data.data() + alignment;
char* p = start;
uint32_t type = NT_GNU_BUILD_ID;
uint32_t namesz = 4;
uint32_t descsz = 20;
MoveToBinaryFormat(namesz, p);
MoveToBinaryFormat(descsz, p);
MoveToBinaryFormat(type, p);
MoveToBinaryFormat(ELF_NOTE_GNU, 4, p);
MoveToBinaryFormat(build_id_data, 20, p);
ASSERT_TRUE(GetBuildIdFromNoteSection(start, p - start, &build_id));
ASSERT_TRUE(build_id == expected_build_id);
}
}
TEST(read_elf, GetBuildIdFromElfFile) {
BuildId build_id;
ASSERT_EQ(ElfStatus::NO_ERROR, GetBuildIdFromElfFile(GetTestData(ELF_FILE), &build_id));
ASSERT_EQ(build_id, BuildId(elf_file_build_id));
}
TEST(read_elf, GetBuildIdFromEmbeddedElfFile) {
BuildId build_id;
ASSERT_EQ(ElfStatus::NO_ERROR, GetBuildIdFromEmbeddedElfFile(GetTestData(APK_FILE), NATIVELIB_OFFSET_IN_APK,
NATIVELIB_SIZE_IN_APK, &build_id));
ASSERT_EQ(build_id, native_lib_build_id);
}
void ParseSymbol(const ElfFileSymbol& symbol, std::map<std::string, ElfFileSymbol>* symbols) {
(*symbols)[symbol.name] = symbol;
}
static void CheckGlobalVariableSymbols(const std::map<std::string, ElfFileSymbol>& symbols) {
auto pos = symbols.find("GlobalVar");
ASSERT_NE(pos, symbols.end());
ASSERT_FALSE(pos->second.is_func);
}
static void CheckFunctionSymbols(const std::map<std::string, ElfFileSymbol>& symbols) {
auto pos = symbols.find("GlobalFunc");
ASSERT_NE(pos, symbols.end());
ASSERT_TRUE(pos->second.is_func);
ASSERT_TRUE(pos->second.is_in_text_section);
}
void CheckElfFileSymbols(const std::map<std::string, ElfFileSymbol>& symbols) {
CheckGlobalVariableSymbols(symbols);
CheckFunctionSymbols(symbols);
}
TEST(read_elf, parse_symbols_from_elf_file_with_correct_build_id) {
std::map<std::string, ElfFileSymbol> symbols;
ASSERT_EQ(ElfStatus::NO_ERROR, ParseSymbolsFromElfFile(GetTestData(ELF_FILE), elf_file_build_id,
std::bind(ParseSymbol, std::placeholders::_1, &symbols)));
CheckElfFileSymbols(symbols);
}
TEST(read_elf, parse_symbols_from_elf_file_without_build_id) {
std::map<std::string, ElfFileSymbol> symbols;
ASSERT_EQ(ElfStatus::NO_ERROR, ParseSymbolsFromElfFile(GetTestData(ELF_FILE), BuildId(),
std::bind(ParseSymbol, std::placeholders::_1, &symbols)));
CheckElfFileSymbols(symbols);
}
TEST(read_elf, parse_symbols_from_elf_file_with_wrong_build_id) {
BuildId build_id("01010101010101010101");
std::map<std::string, ElfFileSymbol> symbols;
ASSERT_EQ(ElfStatus::BUILD_ID_MISMATCH, ParseSymbolsFromElfFile(GetTestData(ELF_FILE), build_id,
std::bind(ParseSymbol, std::placeholders::_1, &symbols)));
}
TEST(read_elf, ParseSymbolsFromEmbeddedElfFile) {
std::map<std::string, ElfFileSymbol> symbols;
ASSERT_EQ(ElfStatus::NO_SYMBOL_TABLE, ParseSymbolsFromEmbeddedElfFile(GetTestData(APK_FILE), NATIVELIB_OFFSET_IN_APK,
NATIVELIB_SIZE_IN_APK, native_lib_build_id,
std::bind(ParseSymbol, std::placeholders::_1, &symbols)));
CheckElfFileSymbols(symbols);
}
TEST(read_elf, ParseSymbolFromMiniDebugInfoElfFile) {
std::map<std::string, ElfFileSymbol> symbols;
ASSERT_EQ(ElfStatus::NO_ERROR, ParseSymbolsFromElfFile(GetTestData(ELF_FILE_WITH_MINI_DEBUG_INFO), BuildId(),
std::bind(ParseSymbol, std::placeholders::_1, &symbols)));
CheckFunctionSymbols(symbols);
}
TEST(read_elf, arm_mapping_symbol) {
ASSERT_TRUE(IsArmMappingSymbol("$a"));
ASSERT_FALSE(IsArmMappingSymbol("$b"));
ASSERT_TRUE(IsArmMappingSymbol("$a.anything"));
ASSERT_FALSE(IsArmMappingSymbol("$a_no_dot"));
}
TEST(read_elf, ElfFile_Open) {
auto IsValidElfPath = [](const std::string& path) {
ElfStatus status;
ElfFile::Open(path, &status);
return status;
};
ASSERT_NE(ElfStatus::NO_ERROR, IsValidElfPath("/dev/zero"));
TemporaryFile tmp_file;
ASSERT_EQ(ElfStatus::READ_FAILED, IsValidElfPath(tmp_file.path));
ASSERT_TRUE(android::base::WriteStringToFile("wrong format for elf", tmp_file.path));
ASSERT_EQ(ElfStatus::FILE_MALFORMED, IsValidElfPath(tmp_file.path));
ASSERT_EQ(ElfStatus::NO_ERROR, IsValidElfPath(GetTestData(ELF_FILE)));
}
TEST(read_elf, check_symbol_for_plt_section) {
std::map<std::string, ElfFileSymbol> symbols;
ASSERT_EQ(ElfStatus::NO_ERROR, ParseSymbolsFromElfFile(GetTestData(ELF_FILE), BuildId(),
std::bind(ParseSymbol, std::placeholders::_1, &symbols)));
ASSERT_NE(symbols.find("@plt"), symbols.end());
}
TEST(read_elf, read_elf_with_broken_section_table) {
std::string elf_path = GetTestData("libsgmainso-6.4.36.so");
std::map<std::string, ElfFileSymbol> symbols;
ASSERT_EQ(ElfStatus::NO_SYMBOL_TABLE,
ParseSymbolsFromElfFile(elf_path, BuildId(),
std::bind(ParseSymbol, std::placeholders::_1, &symbols)));
BuildId build_id;
ASSERT_EQ(ElfStatus::NO_BUILD_ID, GetBuildIdFromElfFile(elf_path, &build_id));
uint64_t min_vaddr;
uint64_t file_offset_of_min_vaddr;
ASSERT_EQ(ElfStatus::NO_ERROR, ReadMinExecutableVirtualAddressFromElfFile(
elf_path, BuildId(), &min_vaddr, &file_offset_of_min_vaddr));
ASSERT_EQ(min_vaddr, 0u);
ASSERT_EQ(file_offset_of_min_vaddr, 0u);
}
TEST(read_elf, ReadMinExecutableVirtualAddressFromElfFile) {
uint64_t min_vaddr;
uint64_t file_offset_of_min_vaddr;
ASSERT_EQ(ElfStatus::NO_ERROR, ReadMinExecutableVirtualAddressFromElfFile(
GetTestData("libc.so"), BuildId(), &min_vaddr, &file_offset_of_min_vaddr));
ASSERT_EQ(min_vaddr, 0x29000u);
ASSERT_EQ(file_offset_of_min_vaddr, 0x29000u);
}
TEST(read_elf, NoUndefinedSymbol) {
// Check if we read undefined symbols (like dlerror) from libc.so.
bool has_dlerror = false;
auto parse_symbol = [&](const ElfFileSymbol& symbol) {
if (symbol.name == "dlerror") {
has_dlerror = true;
}
};
ASSERT_EQ(ElfStatus::NO_ERROR,
ParseSymbolsFromElfFile(GetTestData("libc.so"), BuildId(), parse_symbol));
ASSERT_FALSE(has_dlerror);
}
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