Christopher Ferris | 570b76f | 2017-06-30 17:18:16 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2016 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 <errno.h> |
| 19 | #include <signal.h> |
| 20 | #include <string.h> |
| 21 | #include <sys/mman.h> |
| 22 | #include <sys/ptrace.h> |
| 23 | #include <sys/types.h> |
| 24 | #include <unistd.h> |
| 25 | |
Christopher Ferris | be788d8 | 2017-11-27 14:50:38 -0800 | [diff] [blame] | 26 | #include <atomic> |
Christopher Ferris | 570b76f | 2017-06-30 17:18:16 -0700 | [diff] [blame] | 27 | #include <memory> |
Christopher Ferris | be788d8 | 2017-11-27 14:50:38 -0800 | [diff] [blame] | 28 | #include <thread> |
Christopher Ferris | 570b76f | 2017-06-30 17:18:16 -0700 | [diff] [blame] | 29 | #include <vector> |
| 30 | |
| 31 | #include <android-base/file.h> |
Christopher Ferris | 570b76f | 2017-06-30 17:18:16 -0700 | [diff] [blame] | 32 | #include <gtest/gtest.h> |
| 33 | |
Christopher Ferris | d226a51 | 2017-07-14 10:37:19 -0700 | [diff] [blame] | 34 | #include <unwindstack/Elf.h> |
| 35 | #include <unwindstack/MapInfo.h> |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 36 | #include <unwindstack/Maps.h> |
Christopher Ferris | d226a51 | 2017-07-14 10:37:19 -0700 | [diff] [blame] | 37 | #include <unwindstack/Memory.h> |
| 38 | |
Christopher Ferris | 570b76f | 2017-06-30 17:18:16 -0700 | [diff] [blame] | 39 | #include "ElfTestUtils.h" |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 40 | #include "MemoryFake.h" |
Christopher Ferris | d226a51 | 2017-07-14 10:37:19 -0700 | [diff] [blame] | 41 | |
| 42 | namespace unwindstack { |
Christopher Ferris | 570b76f | 2017-06-30 17:18:16 -0700 | [diff] [blame] | 43 | |
| 44 | class MapInfoGetElfTest : public ::testing::Test { |
| 45 | protected: |
| 46 | void SetUp() override { |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 47 | memory_ = new MemoryFake; |
| 48 | process_memory_.reset(memory_); |
Christopher Ferris | 570b76f | 2017-06-30 17:18:16 -0700 | [diff] [blame] | 49 | } |
| 50 | |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 51 | template <typename Ehdr, typename Shdr> |
| 52 | static void InitElf(uint64_t sh_offset, Ehdr* ehdr, uint8_t class_type, uint8_t machine_type) { |
| 53 | memset(ehdr, 0, sizeof(*ehdr)); |
| 54 | memcpy(ehdr->e_ident, ELFMAG, SELFMAG); |
| 55 | ehdr->e_ident[EI_CLASS] = class_type; |
| 56 | ehdr->e_machine = machine_type; |
| 57 | ehdr->e_shoff = sh_offset; |
| 58 | ehdr->e_shentsize = sizeof(Shdr) + 100; |
| 59 | ehdr->e_shnum = 4; |
| 60 | } |
Christopher Ferris | 570b76f | 2017-06-30 17:18:16 -0700 | [diff] [blame] | 61 | |
| 62 | const size_t kMapSize = 4096; |
| 63 | |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 64 | std::shared_ptr<Memory> process_memory_; |
| 65 | MemoryFake* memory_; |
| 66 | |
| 67 | TemporaryFile elf_; |
Christopher Ferris | 570b76f | 2017-06-30 17:18:16 -0700 | [diff] [blame] | 68 | }; |
| 69 | |
| 70 | TEST_F(MapInfoGetElfTest, invalid) { |
Christopher Ferris | 9d5712c | 2018-10-01 21:01:09 -0700 | [diff] [blame] | 71 | MapInfo info(nullptr, 0x1000, 0x2000, 0, PROT_READ, ""); |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 72 | |
Christopher Ferris | 570b76f | 2017-06-30 17:18:16 -0700 | [diff] [blame] | 73 | // The map is empty, but this should still create an invalid elf object. |
Christopher Ferris | 4568f4b | 2018-10-23 17:42:41 -0700 | [diff] [blame] | 74 | Elf* elf = info.GetElf(process_memory_, ARCH_ARM); |
Christopher Ferris | be788d8 | 2017-11-27 14:50:38 -0800 | [diff] [blame] | 75 | ASSERT_TRUE(elf != nullptr); |
Christopher Ferris | 570b76f | 2017-06-30 17:18:16 -0700 | [diff] [blame] | 76 | ASSERT_FALSE(elf->valid()); |
| 77 | } |
| 78 | |
| 79 | TEST_F(MapInfoGetElfTest, valid32) { |
Christopher Ferris | 9d5712c | 2018-10-01 21:01:09 -0700 | [diff] [blame] | 80 | MapInfo info(nullptr, 0x3000, 0x4000, 0, PROT_READ, ""); |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 81 | |
Christopher Ferris | 570b76f | 2017-06-30 17:18:16 -0700 | [diff] [blame] | 82 | Elf32_Ehdr ehdr; |
| 83 | TestInitEhdr<Elf32_Ehdr>(&ehdr, ELFCLASS32, EM_ARM); |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 84 | memory_->SetMemory(0x3000, &ehdr, sizeof(ehdr)); |
Christopher Ferris | 570b76f | 2017-06-30 17:18:16 -0700 | [diff] [blame] | 85 | |
Christopher Ferris | 4568f4b | 2018-10-23 17:42:41 -0700 | [diff] [blame] | 86 | Elf* elf = info.GetElf(process_memory_, ARCH_ARM); |
Christopher Ferris | be788d8 | 2017-11-27 14:50:38 -0800 | [diff] [blame] | 87 | ASSERT_TRUE(elf != nullptr); |
Christopher Ferris | 570b76f | 2017-06-30 17:18:16 -0700 | [diff] [blame] | 88 | ASSERT_TRUE(elf->valid()); |
| 89 | EXPECT_EQ(static_cast<uint32_t>(EM_ARM), elf->machine_type()); |
| 90 | EXPECT_EQ(ELFCLASS32, elf->class_type()); |
Christopher Ferris | bf373ed | 2019-01-16 17:23:39 -0800 | [diff] [blame] | 91 | |
| 92 | // Now verify that an empty process memory returns an invalid elf object. |
| 93 | info.elf.reset(); |
| 94 | elf = info.GetElf(std::shared_ptr<Memory>(), ARCH_ARM); |
| 95 | ASSERT_TRUE(elf != nullptr); |
| 96 | ASSERT_FALSE(elf->valid()); |
Christopher Ferris | 570b76f | 2017-06-30 17:18:16 -0700 | [diff] [blame] | 97 | } |
| 98 | |
| 99 | TEST_F(MapInfoGetElfTest, valid64) { |
Christopher Ferris | 9d5712c | 2018-10-01 21:01:09 -0700 | [diff] [blame] | 100 | MapInfo info(nullptr, 0x8000, 0x9000, 0, PROT_READ, ""); |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 101 | |
Christopher Ferris | 570b76f | 2017-06-30 17:18:16 -0700 | [diff] [blame] | 102 | Elf64_Ehdr ehdr; |
| 103 | TestInitEhdr<Elf64_Ehdr>(&ehdr, ELFCLASS64, EM_AARCH64); |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 104 | memory_->SetMemory(0x8000, &ehdr, sizeof(ehdr)); |
Christopher Ferris | 570b76f | 2017-06-30 17:18:16 -0700 | [diff] [blame] | 105 | |
Christopher Ferris | 4568f4b | 2018-10-23 17:42:41 -0700 | [diff] [blame] | 106 | Elf* elf = info.GetElf(process_memory_, ARCH_ARM64); |
Christopher Ferris | be788d8 | 2017-11-27 14:50:38 -0800 | [diff] [blame] | 107 | ASSERT_TRUE(elf != nullptr); |
Christopher Ferris | 570b76f | 2017-06-30 17:18:16 -0700 | [diff] [blame] | 108 | ASSERT_TRUE(elf->valid()); |
| 109 | EXPECT_EQ(static_cast<uint32_t>(EM_AARCH64), elf->machine_type()); |
| 110 | EXPECT_EQ(ELFCLASS64, elf->class_type()); |
| 111 | } |
| 112 | |
Christopher Ferris | 4568f4b | 2018-10-23 17:42:41 -0700 | [diff] [blame] | 113 | TEST_F(MapInfoGetElfTest, invalid_arch_mismatch) { |
| 114 | MapInfo info(nullptr, 0x3000, 0x4000, 0, PROT_READ, ""); |
| 115 | |
| 116 | Elf32_Ehdr ehdr; |
| 117 | TestInitEhdr<Elf32_Ehdr>(&ehdr, ELFCLASS32, EM_ARM); |
| 118 | memory_->SetMemory(0x3000, &ehdr, sizeof(ehdr)); |
| 119 | |
| 120 | Elf* elf = info.GetElf(process_memory_, ARCH_X86); |
| 121 | ASSERT_TRUE(elf != nullptr); |
| 122 | ASSERT_FALSE(elf->valid()); |
| 123 | } |
| 124 | |
Christopher Ferris | 570b76f | 2017-06-30 17:18:16 -0700 | [diff] [blame] | 125 | TEST_F(MapInfoGetElfTest, gnu_debugdata_init32) { |
Christopher Ferris | 9d5712c | 2018-10-01 21:01:09 -0700 | [diff] [blame] | 126 | MapInfo info(nullptr, 0x2000, 0x3000, 0, PROT_READ, ""); |
Christopher Ferris | 570b76f | 2017-06-30 17:18:16 -0700 | [diff] [blame] | 127 | |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 128 | TestInitGnuDebugdata<Elf32_Ehdr, Elf32_Shdr>(ELFCLASS32, EM_ARM, true, |
| 129 | [&](uint64_t offset, const void* ptr, size_t size) { |
| 130 | memory_->SetMemory(0x2000 + offset, ptr, size); |
| 131 | }); |
| 132 | |
Christopher Ferris | 4568f4b | 2018-10-23 17:42:41 -0700 | [diff] [blame] | 133 | Elf* elf = info.GetElf(process_memory_, ARCH_ARM); |
Christopher Ferris | be788d8 | 2017-11-27 14:50:38 -0800 | [diff] [blame] | 134 | ASSERT_TRUE(elf != nullptr); |
Christopher Ferris | 570b76f | 2017-06-30 17:18:16 -0700 | [diff] [blame] | 135 | ASSERT_TRUE(elf->valid()); |
| 136 | EXPECT_EQ(static_cast<uint32_t>(EM_ARM), elf->machine_type()); |
| 137 | EXPECT_EQ(ELFCLASS32, elf->class_type()); |
| 138 | EXPECT_TRUE(elf->gnu_debugdata_interface() != nullptr); |
| 139 | } |
| 140 | |
| 141 | TEST_F(MapInfoGetElfTest, gnu_debugdata_init64) { |
Christopher Ferris | 9d5712c | 2018-10-01 21:01:09 -0700 | [diff] [blame] | 142 | MapInfo info(nullptr, 0x5000, 0x8000, 0, PROT_READ, ""); |
Christopher Ferris | 570b76f | 2017-06-30 17:18:16 -0700 | [diff] [blame] | 143 | |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 144 | TestInitGnuDebugdata<Elf64_Ehdr, Elf64_Shdr>(ELFCLASS64, EM_AARCH64, true, |
| 145 | [&](uint64_t offset, const void* ptr, size_t size) { |
| 146 | memory_->SetMemory(0x5000 + offset, ptr, size); |
| 147 | }); |
| 148 | |
Christopher Ferris | 4568f4b | 2018-10-23 17:42:41 -0700 | [diff] [blame] | 149 | Elf* elf = info.GetElf(process_memory_, ARCH_ARM64); |
Christopher Ferris | be788d8 | 2017-11-27 14:50:38 -0800 | [diff] [blame] | 150 | ASSERT_TRUE(elf != nullptr); |
Christopher Ferris | 570b76f | 2017-06-30 17:18:16 -0700 | [diff] [blame] | 151 | ASSERT_TRUE(elf->valid()); |
| 152 | EXPECT_EQ(static_cast<uint32_t>(EM_AARCH64), elf->machine_type()); |
| 153 | EXPECT_EQ(ELFCLASS64, elf->class_type()); |
| 154 | EXPECT_TRUE(elf->gnu_debugdata_interface() != nullptr); |
| 155 | } |
Christopher Ferris | d226a51 | 2017-07-14 10:37:19 -0700 | [diff] [blame] | 156 | |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 157 | TEST_F(MapInfoGetElfTest, end_le_start) { |
Christopher Ferris | 9d5712c | 2018-10-01 21:01:09 -0700 | [diff] [blame] | 158 | MapInfo info(nullptr, 0x1000, 0x1000, 0, PROT_READ, elf_.path); |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 159 | |
| 160 | Elf32_Ehdr ehdr; |
| 161 | TestInitEhdr<Elf32_Ehdr>(&ehdr, ELFCLASS32, EM_ARM); |
| 162 | ASSERT_TRUE(android::base::WriteFully(elf_.fd, &ehdr, sizeof(ehdr))); |
| 163 | |
Christopher Ferris | 4568f4b | 2018-10-23 17:42:41 -0700 | [diff] [blame] | 164 | Elf* elf = info.GetElf(process_memory_, ARCH_ARM); |
Christopher Ferris | be788d8 | 2017-11-27 14:50:38 -0800 | [diff] [blame] | 165 | ASSERT_TRUE(elf != nullptr); |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 166 | ASSERT_FALSE(elf->valid()); |
| 167 | |
Christopher Ferris | 0b79ae1 | 2018-01-25 12:15:56 -0800 | [diff] [blame] | 168 | info.elf.reset(); |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 169 | info.end = 0xfff; |
Christopher Ferris | 4568f4b | 2018-10-23 17:42:41 -0700 | [diff] [blame] | 170 | elf = info.GetElf(process_memory_, ARCH_ARM); |
Christopher Ferris | be788d8 | 2017-11-27 14:50:38 -0800 | [diff] [blame] | 171 | ASSERT_TRUE(elf != nullptr); |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 172 | ASSERT_FALSE(elf->valid()); |
| 173 | |
| 174 | // Make sure this test is valid. |
Christopher Ferris | 0b79ae1 | 2018-01-25 12:15:56 -0800 | [diff] [blame] | 175 | info.elf.reset(); |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 176 | info.end = 0x2000; |
Christopher Ferris | 4568f4b | 2018-10-23 17:42:41 -0700 | [diff] [blame] | 177 | elf = info.GetElf(process_memory_, ARCH_ARM); |
Christopher Ferris | be788d8 | 2017-11-27 14:50:38 -0800 | [diff] [blame] | 178 | ASSERT_TRUE(elf != nullptr); |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 179 | ASSERT_TRUE(elf->valid()); |
| 180 | } |
| 181 | |
| 182 | // Verify that if the offset is non-zero but there is no elf at the offset, |
| 183 | // that the full file is used. |
| 184 | TEST_F(MapInfoGetElfTest, file_backed_non_zero_offset_full_file) { |
Christopher Ferris | 9d5712c | 2018-10-01 21:01:09 -0700 | [diff] [blame] | 185 | MapInfo info(nullptr, 0x1000, 0x2000, 0x100, PROT_READ, elf_.path); |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 186 | |
| 187 | std::vector<uint8_t> buffer(0x1000); |
| 188 | memset(buffer.data(), 0, buffer.size()); |
| 189 | Elf32_Ehdr ehdr; |
| 190 | TestInitEhdr<Elf32_Ehdr>(&ehdr, ELFCLASS32, EM_ARM); |
| 191 | memcpy(buffer.data(), &ehdr, sizeof(ehdr)); |
| 192 | ASSERT_TRUE(android::base::WriteFully(elf_.fd, buffer.data(), buffer.size())); |
| 193 | |
Christopher Ferris | 4568f4b | 2018-10-23 17:42:41 -0700 | [diff] [blame] | 194 | Elf* elf = info.GetElf(process_memory_, ARCH_ARM); |
Christopher Ferris | be788d8 | 2017-11-27 14:50:38 -0800 | [diff] [blame] | 195 | ASSERT_TRUE(elf != nullptr); |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 196 | ASSERT_TRUE(elf->valid()); |
| 197 | ASSERT_TRUE(elf->memory() != nullptr); |
| 198 | ASSERT_EQ(0x100U, info.elf_offset); |
| 199 | |
| 200 | // Read the entire file. |
| 201 | memset(buffer.data(), 0, buffer.size()); |
Josh Gao | ef35aa5 | 2017-10-18 11:44:51 -0700 | [diff] [blame] | 202 | ASSERT_TRUE(elf->memory()->ReadFully(0, buffer.data(), buffer.size())); |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 203 | ASSERT_EQ(0, memcmp(buffer.data(), &ehdr, sizeof(ehdr))); |
| 204 | for (size_t i = sizeof(ehdr); i < buffer.size(); i++) { |
| 205 | ASSERT_EQ(0, buffer[i]) << "Failed at byte " << i; |
| 206 | } |
| 207 | |
Josh Gao | ef35aa5 | 2017-10-18 11:44:51 -0700 | [diff] [blame] | 208 | ASSERT_FALSE(elf->memory()->ReadFully(buffer.size(), buffer.data(), 1)); |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 209 | } |
| 210 | |
| 211 | // Verify that if the offset is non-zero and there is an elf at that |
| 212 | // offset, that only part of the file is used. |
| 213 | TEST_F(MapInfoGetElfTest, file_backed_non_zero_offset_partial_file) { |
Christopher Ferris | 9d5712c | 2018-10-01 21:01:09 -0700 | [diff] [blame] | 214 | MapInfo info(nullptr, 0x1000, 0x2000, 0x2000, PROT_READ, elf_.path); |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 215 | |
| 216 | std::vector<uint8_t> buffer(0x4000); |
| 217 | memset(buffer.data(), 0, buffer.size()); |
| 218 | Elf32_Ehdr ehdr; |
| 219 | TestInitEhdr<Elf32_Ehdr>(&ehdr, ELFCLASS32, EM_ARM); |
| 220 | memcpy(&buffer[info.offset], &ehdr, sizeof(ehdr)); |
| 221 | ASSERT_TRUE(android::base::WriteFully(elf_.fd, buffer.data(), buffer.size())); |
| 222 | |
Christopher Ferris | 4568f4b | 2018-10-23 17:42:41 -0700 | [diff] [blame] | 223 | Elf* elf = info.GetElf(process_memory_, ARCH_ARM); |
Christopher Ferris | be788d8 | 2017-11-27 14:50:38 -0800 | [diff] [blame] | 224 | ASSERT_TRUE(elf != nullptr); |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 225 | ASSERT_TRUE(elf->valid()); |
| 226 | ASSERT_TRUE(elf->memory() != nullptr); |
| 227 | ASSERT_EQ(0U, info.elf_offset); |
| 228 | |
| 229 | // Read the valid part of the file. |
Josh Gao | ef35aa5 | 2017-10-18 11:44:51 -0700 | [diff] [blame] | 230 | ASSERT_TRUE(elf->memory()->ReadFully(0, buffer.data(), 0x1000)); |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 231 | ASSERT_EQ(0, memcmp(buffer.data(), &ehdr, sizeof(ehdr))); |
| 232 | for (size_t i = sizeof(ehdr); i < 0x1000; i++) { |
| 233 | ASSERT_EQ(0, buffer[i]) << "Failed at byte " << i; |
| 234 | } |
| 235 | |
Josh Gao | ef35aa5 | 2017-10-18 11:44:51 -0700 | [diff] [blame] | 236 | ASSERT_FALSE(elf->memory()->ReadFully(0x1000, buffer.data(), 1)); |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 237 | } |
| 238 | |
| 239 | // Verify that if the offset is non-zero and there is an elf at that |
| 240 | // offset, that only part of the file is used. Further verify that if the |
| 241 | // embedded elf is bigger than the initial map, the new object is larger |
| 242 | // than the original map size. Do this for a 32 bit elf and a 64 bit elf. |
| 243 | TEST_F(MapInfoGetElfTest, file_backed_non_zero_offset_partial_file_whole_elf32) { |
Christopher Ferris | 9d5712c | 2018-10-01 21:01:09 -0700 | [diff] [blame] | 244 | MapInfo info(nullptr, 0x5000, 0x6000, 0x1000, PROT_READ, elf_.path); |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 245 | |
| 246 | std::vector<uint8_t> buffer(0x4000); |
| 247 | memset(buffer.data(), 0, buffer.size()); |
| 248 | Elf32_Ehdr ehdr; |
| 249 | TestInitEhdr<Elf32_Ehdr>(&ehdr, ELFCLASS32, EM_ARM); |
| 250 | ehdr.e_shoff = 0x2000; |
| 251 | ehdr.e_shentsize = sizeof(Elf32_Shdr) + 100; |
| 252 | ehdr.e_shnum = 4; |
| 253 | memcpy(&buffer[info.offset], &ehdr, sizeof(ehdr)); |
| 254 | ASSERT_TRUE(android::base::WriteFully(elf_.fd, buffer.data(), buffer.size())); |
| 255 | |
Christopher Ferris | 4568f4b | 2018-10-23 17:42:41 -0700 | [diff] [blame] | 256 | Elf* elf = info.GetElf(process_memory_, ARCH_ARM); |
Christopher Ferris | be788d8 | 2017-11-27 14:50:38 -0800 | [diff] [blame] | 257 | ASSERT_TRUE(elf != nullptr); |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 258 | ASSERT_TRUE(elf->valid()); |
| 259 | ASSERT_TRUE(elf->memory() != nullptr); |
| 260 | ASSERT_EQ(0U, info.elf_offset); |
| 261 | |
| 262 | // Verify the memory is a valid elf. |
| 263 | memset(buffer.data(), 0, buffer.size()); |
Josh Gao | ef35aa5 | 2017-10-18 11:44:51 -0700 | [diff] [blame] | 264 | ASSERT_TRUE(elf->memory()->ReadFully(0, buffer.data(), 0x1000)); |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 265 | ASSERT_EQ(0, memcmp(buffer.data(), &ehdr, sizeof(ehdr))); |
| 266 | |
| 267 | // Read past the end of what would normally be the size of the map. |
Josh Gao | ef35aa5 | 2017-10-18 11:44:51 -0700 | [diff] [blame] | 268 | ASSERT_TRUE(elf->memory()->ReadFully(0x1000, buffer.data(), 1)); |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 269 | } |
| 270 | |
| 271 | TEST_F(MapInfoGetElfTest, file_backed_non_zero_offset_partial_file_whole_elf64) { |
Christopher Ferris | 9d5712c | 2018-10-01 21:01:09 -0700 | [diff] [blame] | 272 | MapInfo info(nullptr, 0x7000, 0x8000, 0x1000, PROT_READ, elf_.path); |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 273 | |
| 274 | std::vector<uint8_t> buffer(0x4000); |
| 275 | memset(buffer.data(), 0, buffer.size()); |
| 276 | Elf64_Ehdr ehdr; |
| 277 | TestInitEhdr<Elf64_Ehdr>(&ehdr, ELFCLASS64, EM_AARCH64); |
| 278 | ehdr.e_shoff = 0x2000; |
| 279 | ehdr.e_shentsize = sizeof(Elf64_Shdr) + 100; |
| 280 | ehdr.e_shnum = 4; |
| 281 | memcpy(&buffer[info.offset], &ehdr, sizeof(ehdr)); |
| 282 | ASSERT_TRUE(android::base::WriteFully(elf_.fd, buffer.data(), buffer.size())); |
| 283 | |
Christopher Ferris | 4568f4b | 2018-10-23 17:42:41 -0700 | [diff] [blame] | 284 | Elf* elf = info.GetElf(process_memory_, ARCH_ARM64); |
Christopher Ferris | be788d8 | 2017-11-27 14:50:38 -0800 | [diff] [blame] | 285 | ASSERT_TRUE(elf != nullptr); |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 286 | ASSERT_TRUE(elf->valid()); |
| 287 | ASSERT_TRUE(elf->memory() != nullptr); |
| 288 | ASSERT_EQ(0U, info.elf_offset); |
| 289 | |
| 290 | // Verify the memory is a valid elf. |
| 291 | memset(buffer.data(), 0, buffer.size()); |
Josh Gao | ef35aa5 | 2017-10-18 11:44:51 -0700 | [diff] [blame] | 292 | ASSERT_TRUE(elf->memory()->ReadFully(0, buffer.data(), 0x1000)); |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 293 | ASSERT_EQ(0, memcmp(buffer.data(), &ehdr, sizeof(ehdr))); |
| 294 | |
| 295 | // Read past the end of what would normally be the size of the map. |
Josh Gao | ef35aa5 | 2017-10-18 11:44:51 -0700 | [diff] [blame] | 296 | ASSERT_TRUE(elf->memory()->ReadFully(0x1000, buffer.data(), 1)); |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 297 | } |
| 298 | |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 299 | TEST_F(MapInfoGetElfTest, check_device_maps) { |
Christopher Ferris | 9d5712c | 2018-10-01 21:01:09 -0700 | [diff] [blame] | 300 | MapInfo info(nullptr, 0x7000, 0x8000, 0x1000, PROT_READ | MAPS_FLAGS_DEVICE_MAP, |
| 301 | "/dev/something"); |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 302 | |
| 303 | // Create valid elf data in process memory for this to verify that only |
| 304 | // the name is causing invalid elf data. |
| 305 | Elf64_Ehdr ehdr; |
| 306 | TestInitEhdr<Elf64_Ehdr>(&ehdr, ELFCLASS64, EM_X86_64); |
| 307 | ehdr.e_shoff = 0x2000; |
| 308 | ehdr.e_shentsize = sizeof(Elf64_Shdr) + 100; |
Christopher Ferris | 5acf069 | 2018-08-01 13:10:46 -0700 | [diff] [blame] | 309 | ehdr.e_shnum = 0; |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 310 | memory_->SetMemory(0x7000, &ehdr, sizeof(ehdr)); |
| 311 | |
Christopher Ferris | 4568f4b | 2018-10-23 17:42:41 -0700 | [diff] [blame] | 312 | Elf* elf = info.GetElf(process_memory_, ARCH_X86_64); |
Christopher Ferris | be788d8 | 2017-11-27 14:50:38 -0800 | [diff] [blame] | 313 | ASSERT_TRUE(elf != nullptr); |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 314 | ASSERT_FALSE(elf->valid()); |
| 315 | |
| 316 | // Set the name to nothing to verify that it still fails. |
Christopher Ferris | 0b79ae1 | 2018-01-25 12:15:56 -0800 | [diff] [blame] | 317 | info.elf.reset(); |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 318 | info.name = ""; |
Christopher Ferris | 4568f4b | 2018-10-23 17:42:41 -0700 | [diff] [blame] | 319 | elf = info.GetElf(process_memory_, ARCH_X86_64); |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 320 | ASSERT_FALSE(elf->valid()); |
| 321 | |
| 322 | // Change the flags and verify the elf is valid now. |
Christopher Ferris | 0b79ae1 | 2018-01-25 12:15:56 -0800 | [diff] [blame] | 323 | info.elf.reset(); |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 324 | info.flags = PROT_READ; |
Christopher Ferris | 4568f4b | 2018-10-23 17:42:41 -0700 | [diff] [blame] | 325 | elf = info.GetElf(process_memory_, ARCH_X86_64); |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 326 | ASSERT_TRUE(elf->valid()); |
| 327 | } |
| 328 | |
Christopher Ferris | be788d8 | 2017-11-27 14:50:38 -0800 | [diff] [blame] | 329 | TEST_F(MapInfoGetElfTest, multiple_thread_get_elf) { |
| 330 | static constexpr size_t kNumConcurrentThreads = 100; |
| 331 | |
| 332 | Elf64_Ehdr ehdr; |
| 333 | TestInitEhdr<Elf64_Ehdr>(&ehdr, ELFCLASS64, EM_X86_64); |
| 334 | ehdr.e_shoff = 0x2000; |
| 335 | ehdr.e_shentsize = sizeof(Elf64_Shdr) + 100; |
Christopher Ferris | 5acf069 | 2018-08-01 13:10:46 -0700 | [diff] [blame] | 336 | ehdr.e_shnum = 0; |
Christopher Ferris | be788d8 | 2017-11-27 14:50:38 -0800 | [diff] [blame] | 337 | memory_->SetMemory(0x7000, &ehdr, sizeof(ehdr)); |
| 338 | |
| 339 | Elf* elf_in_threads[kNumConcurrentThreads]; |
| 340 | std::vector<std::thread*> threads; |
| 341 | |
| 342 | std::atomic_bool wait; |
| 343 | wait = true; |
| 344 | // Create all of the threads and have them do the GetElf at the same time |
| 345 | // to make it likely that a race will occur. |
Christopher Ferris | 9d5712c | 2018-10-01 21:01:09 -0700 | [diff] [blame] | 346 | MapInfo info(nullptr, 0x7000, 0x8000, 0x1000, PROT_READ, ""); |
Christopher Ferris | be788d8 | 2017-11-27 14:50:38 -0800 | [diff] [blame] | 347 | for (size_t i = 0; i < kNumConcurrentThreads; i++) { |
| 348 | std::thread* thread = new std::thread([i, this, &wait, &info, &elf_in_threads]() { |
| 349 | while (wait) |
| 350 | ; |
Christopher Ferris | 4568f4b | 2018-10-23 17:42:41 -0700 | [diff] [blame] | 351 | Elf* elf = info.GetElf(process_memory_, ARCH_X86_64); |
Christopher Ferris | be788d8 | 2017-11-27 14:50:38 -0800 | [diff] [blame] | 352 | elf_in_threads[i] = elf; |
| 353 | }); |
| 354 | threads.push_back(thread); |
| 355 | } |
| 356 | ASSERT_TRUE(info.elf == nullptr); |
| 357 | |
| 358 | // Set them all going and wait for the threads to finish. |
| 359 | wait = false; |
| 360 | for (auto thread : threads) { |
| 361 | thread->join(); |
| 362 | delete thread; |
| 363 | } |
| 364 | |
| 365 | // Now verify that all of the elf files are exactly the same and valid. |
Christopher Ferris | 0b79ae1 | 2018-01-25 12:15:56 -0800 | [diff] [blame] | 366 | Elf* elf = info.elf.get(); |
Christopher Ferris | be788d8 | 2017-11-27 14:50:38 -0800 | [diff] [blame] | 367 | ASSERT_TRUE(elf != nullptr); |
| 368 | EXPECT_TRUE(elf->valid()); |
| 369 | for (size_t i = 0; i < kNumConcurrentThreads; i++) { |
| 370 | EXPECT_EQ(elf, elf_in_threads[i]) << "Thread " << i << " mismatched."; |
| 371 | } |
| 372 | } |
| 373 | |
Christopher Ferris | 02a6c44 | 2019-03-11 14:43:33 -0700 | [diff] [blame] | 374 | // Verify that previous maps don't automatically get the same elf object. |
| 375 | TEST_F(MapInfoGetElfTest, prev_map_elf_not_set) { |
| 376 | MapInfo info1(nullptr, 0x1000, 0x2000, 0, PROT_READ, "/not/present"); |
| 377 | MapInfo info2(&info1, 0x2000, 0x3000, 0, PROT_READ, elf_.path); |
| 378 | |
| 379 | Elf32_Ehdr ehdr; |
| 380 | TestInitEhdr<Elf32_Ehdr>(&ehdr, ELFCLASS32, EM_ARM); |
| 381 | memory_->SetMemory(0x2000, &ehdr, sizeof(ehdr)); |
| 382 | Elf* elf = info2.GetElf(process_memory_, ARCH_ARM); |
| 383 | ASSERT_TRUE(elf != nullptr); |
| 384 | ASSERT_TRUE(elf->valid()); |
| 385 | |
| 386 | ASSERT_NE(elf, info1.GetElf(process_memory_, ARCH_ARM)); |
| 387 | } |
| 388 | |
| 389 | // Verify that a read-only map followed by a read-execute map will result |
| 390 | // in the same elf object in both maps. |
| 391 | TEST_F(MapInfoGetElfTest, read_only_followed_by_read_exec_share_elf) { |
| 392 | MapInfo r_info(nullptr, 0x1000, 0x2000, 0, PROT_READ, elf_.path); |
| 393 | MapInfo rw_info(&r_info, 0x2000, 0x3000, 0x1000, PROT_READ | PROT_EXEC, elf_.path); |
| 394 | |
| 395 | Elf32_Ehdr ehdr; |
| 396 | TestInitEhdr<Elf32_Ehdr>(&ehdr, ELFCLASS32, EM_ARM); |
| 397 | memory_->SetMemory(0x1000, &ehdr, sizeof(ehdr)); |
| 398 | Elf* elf = rw_info.GetElf(process_memory_, ARCH_ARM); |
| 399 | ASSERT_TRUE(elf != nullptr); |
| 400 | ASSERT_TRUE(elf->valid()); |
| 401 | |
| 402 | ASSERT_EQ(elf, r_info.GetElf(process_memory_, ARCH_ARM)); |
| 403 | } |
| 404 | |
Christopher Ferris | d226a51 | 2017-07-14 10:37:19 -0700 | [diff] [blame] | 405 | } // namespace unwindstack |