5f118519fd
New function to create the process memory object. This allows for a future where different remote process memory objects could be created depending on the way remote memory can be created. Even different local memory objects that access memory without doing any checks. It also allows MemoryRange objects to share one single process memory object and could help if the process memory object caches data. Small changes to MapInfo::CreateMemory to when some errors are detected. - Always check if the map is a device map, instead of only if the name is not empty. - Check if a memory map is readable before creating the memory from process memory. Bug: 23762183 Test: Ran unit tests, unwound on device using the new code. Change-Id: I12a93c2dc19639689a528ec41c67bfac74d431b3
233 lines
7.9 KiB
C++
233 lines
7.9 KiB
C++
/*
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* Copyright (C) 2016 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 <elf.h>
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#include <errno.h>
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#include <signal.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <sys/ptrace.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <memory>
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#include <vector>
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#include <android-base/file.h>
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#include <android-base/test_utils.h>
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#include <gtest/gtest.h>
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#include <unwindstack/Elf.h>
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#include <unwindstack/MapInfo.h>
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#include <unwindstack/Memory.h>
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#include "MemoryFake.h"
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namespace unwindstack {
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class MapInfoCreateMemoryTest : public ::testing::Test {
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protected:
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template <typename Ehdr, typename Shdr>
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static void InitElf(int fd, uint64_t file_offset, uint64_t sh_offset, uint8_t class_type) {
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std::vector<uint8_t> buffer(20000);
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memset(buffer.data(), 0, buffer.size());
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Ehdr ehdr;
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memset(&ehdr, 0, sizeof(ehdr));
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memcpy(ehdr.e_ident, ELFMAG, SELFMAG);
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ehdr.e_ident[EI_CLASS] = class_type;
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ehdr.e_shoff = sh_offset;
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ehdr.e_shentsize = sizeof(Shdr) + 100;
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ehdr.e_shnum = 4;
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memcpy(&buffer[file_offset], &ehdr, sizeof(ehdr));
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ASSERT_TRUE(android::base::WriteFully(fd, buffer.data(), buffer.size()));
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}
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static void SetUpTestCase() {
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std::vector<uint8_t> buffer(1024);
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memset(buffer.data(), 0, buffer.size());
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memcpy(buffer.data(), ELFMAG, SELFMAG);
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buffer[EI_CLASS] = ELFCLASS32;
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ASSERT_TRUE(android::base::WriteFully(elf_.fd, buffer.data(), buffer.size()));
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memset(buffer.data(), 0, buffer.size());
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memcpy(&buffer[0x100], ELFMAG, SELFMAG);
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buffer[0x100 + EI_CLASS] = ELFCLASS64;
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ASSERT_TRUE(android::base::WriteFully(elf_at_100_.fd, buffer.data(), buffer.size()));
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InitElf<Elf32_Ehdr, Elf32_Shdr>(elf32_at_map_.fd, 0x1000, 0x2000, ELFCLASS32);
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InitElf<Elf64_Ehdr, Elf64_Shdr>(elf64_at_map_.fd, 0x2000, 0x3000, ELFCLASS64);
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}
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void SetUp() override {
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memory_ = new MemoryFake;
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process_memory_.reset(memory_);
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}
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MemoryFake* memory_;
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std::shared_ptr<Memory> process_memory_;
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static TemporaryFile elf_;
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static TemporaryFile elf_at_100_;
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static TemporaryFile elf32_at_map_;
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static TemporaryFile elf64_at_map_;
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};
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TemporaryFile MapInfoCreateMemoryTest::elf_;
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TemporaryFile MapInfoCreateMemoryTest::elf_at_100_;
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TemporaryFile MapInfoCreateMemoryTest::elf32_at_map_;
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TemporaryFile MapInfoCreateMemoryTest::elf64_at_map_;
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TEST_F(MapInfoCreateMemoryTest, end_le_start) {
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MapInfo info{.start = 0x100, .end = 0x100, .offset = 0, .name = elf_.path};
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std::unique_ptr<Memory> memory(info.CreateMemory(process_memory_));
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ASSERT_TRUE(memory.get() == nullptr);
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info.end = 0xff;
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memory.reset(info.CreateMemory(process_memory_));
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ASSERT_TRUE(memory.get() == nullptr);
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// Make sure this test is valid.
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info.end = 0x101;
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memory.reset(info.CreateMemory(process_memory_));
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ASSERT_TRUE(memory.get() != nullptr);
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}
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// Verify that if the offset is non-zero but there is no elf at the offset,
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// that the full file is used.
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TEST_F(MapInfoCreateMemoryTest, file_backed_non_zero_offset_full_file) {
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MapInfo info{.start = 0x100, .end = 0x200, .offset = 0x100, .name = elf_.path};
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std::unique_ptr<Memory> memory(info.CreateMemory(process_memory_));
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ASSERT_TRUE(memory.get() != nullptr);
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ASSERT_EQ(0x100U, info.elf_offset);
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// Read the entire file.
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std::vector<uint8_t> buffer(1024);
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ASSERT_TRUE(memory->Read(0, buffer.data(), 1024));
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ASSERT_TRUE(memcmp(buffer.data(), ELFMAG, SELFMAG) == 0);
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ASSERT_EQ(ELFCLASS32, buffer[EI_CLASS]);
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for (size_t i = EI_CLASS + 1; i < buffer.size(); i++) {
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ASSERT_EQ(0, buffer[i]) << "Failed at byte " << i;
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}
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ASSERT_FALSE(memory->Read(1024, buffer.data(), 1));
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}
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// Verify that if the offset is non-zero and there is an elf at that
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// offset, that only part of the file is used.
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TEST_F(MapInfoCreateMemoryTest, file_backed_non_zero_offset_partial_file) {
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MapInfo info{.start = 0x100, .end = 0x200, .offset = 0x100, .name = elf_at_100_.path};
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std::unique_ptr<Memory> memory(info.CreateMemory(process_memory_));
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ASSERT_TRUE(memory.get() != nullptr);
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ASSERT_EQ(0U, info.elf_offset);
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// Read the valid part of the file.
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std::vector<uint8_t> buffer(0x100);
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ASSERT_TRUE(memory->Read(0, buffer.data(), 0x100));
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ASSERT_TRUE(memcmp(buffer.data(), ELFMAG, SELFMAG) == 0);
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ASSERT_EQ(ELFCLASS64, buffer[EI_CLASS]);
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for (size_t i = EI_CLASS + 1; i < buffer.size(); i++) {
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ASSERT_EQ(0, buffer[i]) << "Failed at byte " << i;
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}
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ASSERT_FALSE(memory->Read(0x100, buffer.data(), 1));
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}
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// Verify that if the offset is non-zero and there is an elf at that
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// offset, that only part of the file is used. Further verify that if the
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// embedded elf is bigger than the initial map, the new object is larger
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// than the original map size. Do this for a 32 bit elf and a 64 bit elf.
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TEST_F(MapInfoCreateMemoryTest, file_backed_non_zero_offset_partial_file_whole_elf32) {
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MapInfo info{.start = 0x5000, .end = 0x6000, .offset = 0x1000, .name = elf32_at_map_.path};
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std::unique_ptr<Memory> memory(info.CreateMemory(process_memory_));
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ASSERT_TRUE(memory.get() != nullptr);
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ASSERT_EQ(0U, info.elf_offset);
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// Verify the memory is a valid elf.
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uint8_t e_ident[SELFMAG + 1];
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ASSERT_TRUE(memory->Read(0, e_ident, SELFMAG));
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ASSERT_EQ(0, memcmp(e_ident, ELFMAG, SELFMAG));
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// Read past the end of what would normally be the size of the map.
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ASSERT_TRUE(memory->Read(0x1000, e_ident, 1));
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}
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TEST_F(MapInfoCreateMemoryTest, file_backed_non_zero_offset_partial_file_whole_elf64) {
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MapInfo info{.start = 0x7000, .end = 0x8000, .offset = 0x2000, .name = elf64_at_map_.path};
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std::unique_ptr<Memory> memory(info.CreateMemory(process_memory_));
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ASSERT_TRUE(memory.get() != nullptr);
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ASSERT_EQ(0U, info.elf_offset);
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// Verify the memory is a valid elf.
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uint8_t e_ident[SELFMAG + 1];
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ASSERT_TRUE(memory->Read(0, e_ident, SELFMAG));
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ASSERT_EQ(0, memcmp(e_ident, ELFMAG, SELFMAG));
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// Read past the end of what would normally be the size of the map.
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ASSERT_TRUE(memory->Read(0x1000, e_ident, 1));
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}
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// Verify that device file names will never result in Memory object creation.
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TEST_F(MapInfoCreateMemoryTest, check_device_maps) {
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// Set up some memory so that a valid local memory object would
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// be returned if the file mapping fails, but the device check is incorrect.
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std::vector<uint8_t> buffer(1024);
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MapInfo info;
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info.start = reinterpret_cast<uint64_t>(buffer.data());
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info.end = info.start + buffer.size();
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info.offset = 0;
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info.flags = 0x8000;
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info.name = "/dev/something";
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std::unique_ptr<Memory> memory(info.CreateMemory(process_memory_));
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ASSERT_TRUE(memory.get() == nullptr);
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}
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TEST_F(MapInfoCreateMemoryTest, process_memory) {
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MapInfo info;
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info.start = 0x2000;
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info.end = 0x3000;
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info.offset = 0;
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// Verify that the the process_memory object is used, so seed it
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// with memory.
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std::vector<uint8_t> buffer(1024);
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for (size_t i = 0; i < buffer.size(); i++) {
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buffer[i] = i % 256;
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}
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memory_->SetMemory(info.start, buffer.data(), buffer.size());
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std::unique_ptr<Memory> memory(info.CreateMemory(process_memory_));
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ASSERT_TRUE(memory.get() != nullptr);
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memset(buffer.data(), 0, buffer.size());
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ASSERT_TRUE(memory->Read(0, buffer.data(), buffer.size()));
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for (size_t i = 0; i < buffer.size(); i++) {
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ASSERT_EQ(i % 256, buffer[i]) << "Failed at byte " << i;
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}
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// Try to read outside of the map size.
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ASSERT_FALSE(memory->Read(buffer.size(), buffer.data(), 1));
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}
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} // namespace unwindstack
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