Christopher Ferris | bf373ed | 2019-01-16 17:23:39 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2019 The Android Open Source Project |
| 3 | * |
| 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 |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 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. |
| 15 | */ |
| 16 | |
| 17 | #include <elf.h> |
| 18 | #include <string.h> |
| 19 | #include <sys/mman.h> |
| 20 | #include <unistd.h> |
| 21 | |
| 22 | #include <atomic> |
| 23 | #include <memory> |
| 24 | #include <string> |
| 25 | #include <thread> |
| 26 | #include <vector> |
| 27 | |
| 28 | #include <android-base/test_utils.h> |
| 29 | |
| 30 | #include <gtest/gtest.h> |
| 31 | |
| 32 | #include <unwindstack/Elf.h> |
| 33 | #include <unwindstack/MapInfo.h> |
| 34 | #include <unwindstack/Maps.h> |
| 35 | #include <unwindstack/Memory.h> |
| 36 | |
| 37 | #include "ElfFake.h" |
| 38 | #include "ElfTestUtils.h" |
| 39 | #include "MemoryFake.h" |
| 40 | |
| 41 | namespace unwindstack { |
| 42 | |
| 43 | class MapInfoGetBuildIDTest : public ::testing::Test { |
| 44 | protected: |
| 45 | void SetUp() override { |
| 46 | tf_.reset(new TemporaryFile); |
| 47 | |
| 48 | memory_ = new MemoryFake; |
| 49 | elf_ = new ElfFake(new MemoryFake); |
| 50 | elf_interface_ = new ElfInterfaceFake(memory_); |
| 51 | elf_->FakeSetInterface(elf_interface_); |
| 52 | elf_container_.reset(elf_); |
| 53 | map_info_.reset(new MapInfo(nullptr, 0x1000, 0x20000, 0, PROT_READ | PROT_WRITE, tf_->path)); |
| 54 | } |
| 55 | |
| 56 | void MultipleThreadTest(std::string expected_build_id); |
| 57 | |
| 58 | MemoryFake* memory_; |
| 59 | ElfFake* elf_; |
| 60 | ElfInterfaceFake* elf_interface_; |
| 61 | std::unique_ptr<ElfFake> elf_container_; |
| 62 | std::unique_ptr<MapInfo> map_info_; |
| 63 | std::unique_ptr<TemporaryFile> tf_; |
| 64 | }; |
| 65 | |
| 66 | TEST_F(MapInfoGetBuildIDTest, no_elf_and_no_valid_elf_in_memory) { |
| 67 | MapInfo info(nullptr, 0x1000, 0x2000, 0, PROT_READ, ""); |
| 68 | |
| 69 | EXPECT_EQ("", info.GetBuildID()); |
Christopher Ferris | b1c9c20 | 2019-01-25 14:28:13 -0800 | [diff] [blame] | 70 | EXPECT_EQ("", info.GetPrintableBuildID()); |
Christopher Ferris | bf373ed | 2019-01-16 17:23:39 -0800 | [diff] [blame] | 71 | } |
| 72 | |
| 73 | TEST_F(MapInfoGetBuildIDTest, from_elf) { |
| 74 | map_info_->elf.reset(elf_container_.release()); |
| 75 | elf_interface_->FakeSetBuildID("FAKE_BUILD_ID"); |
| 76 | |
| 77 | EXPECT_EQ("FAKE_BUILD_ID", map_info_->GetBuildID()); |
Christopher Ferris | b1c9c20 | 2019-01-25 14:28:13 -0800 | [diff] [blame] | 78 | EXPECT_EQ("46414b455f4255494c445f4944", map_info_->GetPrintableBuildID()); |
Christopher Ferris | bf373ed | 2019-01-16 17:23:39 -0800 | [diff] [blame] | 79 | } |
| 80 | |
Christopher Ferris | ce34d62 | 2019-01-30 10:55:27 -0800 | [diff] [blame] | 81 | TEST_F(MapInfoGetBuildIDTest, from_elf_no_sign_extension) { |
| 82 | map_info_->elf.reset(elf_container_.release()); |
| 83 | |
| 84 | std::string build_id = {static_cast<char>(0xfa), static_cast<char>(0xab), static_cast<char>(0x12), |
| 85 | static_cast<char>(0x02)}; |
| 86 | elf_interface_->FakeSetBuildID(build_id); |
| 87 | |
| 88 | EXPECT_EQ("\xFA\xAB\x12\x2", map_info_->GetBuildID()); |
| 89 | EXPECT_EQ("faab1202", map_info_->GetPrintableBuildID()); |
| 90 | } |
| 91 | |
Christopher Ferris | bf373ed | 2019-01-16 17:23:39 -0800 | [diff] [blame] | 92 | void MapInfoGetBuildIDTest::MultipleThreadTest(std::string expected_build_id) { |
| 93 | static constexpr size_t kNumConcurrentThreads = 100; |
| 94 | |
| 95 | std::string build_id_values[kNumConcurrentThreads]; |
| 96 | std::vector<std::thread*> threads; |
| 97 | |
| 98 | std::atomic_bool wait; |
| 99 | wait = true; |
| 100 | // Create all of the threads and have them do the GetLoadBias at the same time |
| 101 | // to make it likely that a race will occur. |
| 102 | for (size_t i = 0; i < kNumConcurrentThreads; i++) { |
| 103 | std::thread* thread = new std::thread([i, this, &wait, &build_id_values]() { |
| 104 | while (wait) |
| 105 | ; |
| 106 | build_id_values[i] = map_info_->GetBuildID(); |
| 107 | }); |
| 108 | threads.push_back(thread); |
| 109 | } |
| 110 | |
| 111 | // Set them all going and wait for the threads to finish. |
| 112 | wait = false; |
| 113 | for (auto thread : threads) { |
| 114 | thread->join(); |
| 115 | delete thread; |
| 116 | } |
| 117 | |
| 118 | // Now verify that all of the elf files are exactly the same and valid. |
| 119 | for (size_t i = 0; i < kNumConcurrentThreads; i++) { |
| 120 | EXPECT_EQ(expected_build_id, build_id_values[i]) << "Thread " << i << " mismatched."; |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | TEST_F(MapInfoGetBuildIDTest, multiple_thread_elf_exists) { |
| 125 | map_info_->elf.reset(elf_container_.release()); |
| 126 | elf_interface_->FakeSetBuildID("FAKE_BUILD_ID"); |
| 127 | |
| 128 | MultipleThreadTest("FAKE_BUILD_ID"); |
| 129 | } |
| 130 | |
| 131 | static void InitElfData(int fd) { |
| 132 | Elf32_Ehdr ehdr; |
| 133 | TestInitEhdr(&ehdr, ELFCLASS32, EM_ARM); |
| 134 | ehdr.e_shoff = 0x2000; |
| 135 | ehdr.e_shnum = 3; |
| 136 | ehdr.e_shentsize = sizeof(Elf32_Shdr); |
| 137 | ehdr.e_shstrndx = 2; |
| 138 | off_t offset = 0; |
| 139 | ASSERT_EQ(offset, lseek(fd, offset, SEEK_SET)); |
| 140 | ASSERT_EQ(static_cast<ssize_t>(sizeof(ehdr)), write(fd, &ehdr, sizeof(ehdr))); |
| 141 | |
| 142 | char note_section[128]; |
| 143 | Elf32_Nhdr note_header = {}; |
| 144 | note_header.n_namesz = 4; // "GNU" |
| 145 | note_header.n_descsz = 12; // "ELF_BUILDID" |
| 146 | note_header.n_type = NT_GNU_BUILD_ID; |
| 147 | memcpy(¬e_section, ¬e_header, sizeof(note_header)); |
| 148 | size_t note_offset = sizeof(note_header); |
| 149 | memcpy(¬e_section[note_offset], "GNU", sizeof("GNU")); |
| 150 | note_offset += sizeof("GNU"); |
| 151 | memcpy(¬e_section[note_offset], "ELF_BUILDID", sizeof("ELF_BUILDID")); |
| 152 | note_offset += sizeof("ELF_BUILDID"); |
| 153 | |
| 154 | Elf32_Shdr shdr = {}; |
| 155 | shdr.sh_type = SHT_NOTE; |
| 156 | shdr.sh_name = 0x500; |
| 157 | shdr.sh_offset = 0xb000; |
| 158 | shdr.sh_size = sizeof(note_section); |
| 159 | offset += ehdr.e_shoff + sizeof(shdr); |
| 160 | ASSERT_EQ(offset, lseek(fd, offset, SEEK_SET)); |
| 161 | ASSERT_EQ(static_cast<ssize_t>(sizeof(shdr)), write(fd, &shdr, sizeof(shdr))); |
| 162 | |
| 163 | // The string data for section header names. |
| 164 | memset(&shdr, 0, sizeof(shdr)); |
| 165 | shdr.sh_type = SHT_STRTAB; |
| 166 | shdr.sh_name = 0x20000; |
| 167 | shdr.sh_offset = 0xf000; |
| 168 | shdr.sh_size = 0x1000; |
| 169 | offset += sizeof(shdr); |
| 170 | ASSERT_EQ(offset, lseek(fd, offset, SEEK_SET)); |
| 171 | ASSERT_EQ(static_cast<ssize_t>(sizeof(shdr)), write(fd, &shdr, sizeof(shdr))); |
| 172 | |
| 173 | offset = 0xf500; |
| 174 | ASSERT_EQ(offset, lseek(fd, offset, SEEK_SET)); |
| 175 | ASSERT_EQ(static_cast<ssize_t>(sizeof(".note.gnu.build-id")), |
| 176 | write(fd, ".note.gnu.build-id", sizeof(".note.gnu.build-id"))); |
| 177 | |
| 178 | offset = 0xb000; |
| 179 | ASSERT_EQ(offset, lseek(fd, offset, SEEK_SET)); |
| 180 | ASSERT_EQ(static_cast<ssize_t>(sizeof(note_section)), |
| 181 | write(fd, note_section, sizeof(note_section))); |
| 182 | } |
| 183 | |
| 184 | TEST_F(MapInfoGetBuildIDTest, from_memory) { |
| 185 | InitElfData(tf_->fd); |
| 186 | |
| 187 | EXPECT_EQ("ELF_BUILDID", map_info_->GetBuildID()); |
Christopher Ferris | b1c9c20 | 2019-01-25 14:28:13 -0800 | [diff] [blame] | 188 | EXPECT_EQ("454c465f4255494c444944", map_info_->GetPrintableBuildID()); |
Christopher Ferris | bf373ed | 2019-01-16 17:23:39 -0800 | [diff] [blame] | 189 | } |
| 190 | |
| 191 | TEST_F(MapInfoGetBuildIDTest, multiple_thread_elf_exists_in_memory) { |
| 192 | InitElfData(tf_->fd); |
| 193 | |
| 194 | MultipleThreadTest("ELF_BUILDID"); |
| 195 | } |
| 196 | |
| 197 | } // namespace unwindstack |