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/*
* Copyright (C) 2016 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 <elf.h>
#include <errno.h>
#include <signal.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/ptrace.h>
#include <sys/types.h>
#include <unistd.h>
#include <memory>
#include <vector>
#include <android-base/file.h>
#include <android-base/test_utils.h>
#include <gtest/gtest.h>
#include <unwindstack/Elf.h>
#include <unwindstack/MapInfo.h>
#include <unwindstack/Memory.h>
namespace unwindstack {
class MapInfoCreateMemoryTest : public ::testing::Test {
protected:
static void SetUpTestCase() {
std::vector<uint8_t> buffer(1024);
memcpy(buffer.data(), ELFMAG, SELFMAG);
for (size_t i = SELFMAG; i < buffer.size(); i++) {
buffer[i] = i / 256 + 1;
}
ASSERT_TRUE(android::base::WriteFully(elf_.fd, buffer.data(), buffer.size()));
for (size_t i = 0; i < 0x100; i++) {
buffer[i] = i / 256 + 1;
}
memcpy(&buffer[0x100], ELFMAG, SELFMAG);
for (size_t i = 0x100 + SELFMAG; i < buffer.size(); i++) {
buffer[i] = i / 256 + 1;
}
ASSERT_TRUE(android::base::WriteFully(elf_at_100_.fd, buffer.data(), buffer.size()));
}
static TemporaryFile elf_;
static TemporaryFile elf_at_100_;
};
TemporaryFile MapInfoCreateMemoryTest::elf_;
TemporaryFile MapInfoCreateMemoryTest::elf_at_100_;
TEST_F(MapInfoCreateMemoryTest, end_le_start) {
MapInfo info{.start = 0x100, .end = 0x100, .offset = 0, .name = elf_.path};
std::unique_ptr<Memory> memory;
memory.reset(info.CreateMemory(getpid()));
ASSERT_TRUE(memory.get() == nullptr);
info.end = 0xff;
memory.reset(info.CreateMemory(getpid()));
ASSERT_TRUE(memory.get() == nullptr);
// Make sure this test is valid.
info.end = 0x101;
memory.reset(info.CreateMemory(getpid()));
ASSERT_TRUE(memory.get() != nullptr);
}
// Verify that if the offset is non-zero but there is no elf at the offset,
// that the full file is used.
TEST_F(MapInfoCreateMemoryTest, file_backed_non_zero_offset_full_file) {
MapInfo info{.start = 0x100, .end = 0x200, .offset = 0x100, .name = elf_.path};
std::unique_ptr<Memory> memory(info.CreateMemory(getpid()));
ASSERT_TRUE(memory.get() != nullptr);
ASSERT_EQ(0x100U, info.elf_offset);
// Read the entire file.
std::vector<uint8_t> buffer(1024);
ASSERT_TRUE(memory->Read(0, buffer.data(), 1024));
ASSERT_TRUE(memcmp(buffer.data(), ELFMAG, SELFMAG) == 0);
for (size_t i = SELFMAG; i < buffer.size(); i++) {
ASSERT_EQ(i / 256 + 1, buffer[i]) << "Failed at byte " << i;
}
ASSERT_FALSE(memory->Read(1024, buffer.data(), 1));
}
// Verify that if the offset is non-zero and there is an elf at that
// offset, that only part of the file is used.
TEST_F(MapInfoCreateMemoryTest, file_backed_non_zero_offset_partial_file) {
MapInfo info{.start = 0x100, .end = 0x200, .offset = 0x100, .name = elf_at_100_.path};
std::unique_ptr<Memory> memory(info.CreateMemory(getpid()));
ASSERT_TRUE(memory.get() != nullptr);
ASSERT_EQ(0U, info.elf_offset);
// Read the valid part of the file.
std::vector<uint8_t> buffer(0x100);
ASSERT_TRUE(memory->Read(0, buffer.data(), 0x100));
ASSERT_TRUE(memcmp(buffer.data(), ELFMAG, SELFMAG) == 0);
for (size_t i = SELFMAG; i < buffer.size(); i++) {
ASSERT_EQ(2, buffer[i]) << "Failed at byte " << i;
}
ASSERT_FALSE(memory->Read(0x100, buffer.data(), 1));
}
// Verify that device file names will never result in Memory object creation.
TEST_F(MapInfoCreateMemoryTest, check_device_maps) {
// Set up some memory so that a valid local memory object would
// be returned if the file mapping fails, but the device check is incorrect.
std::vector<uint8_t> buffer(1024);
MapInfo info;
info.start = reinterpret_cast<uint64_t>(buffer.data());
info.end = info.start + buffer.size();
info.offset = 0;
std::unique_ptr<Memory> memory;
info.flags = 0x8000;
info.name = "/dev/something";
memory.reset(info.CreateMemory(getpid()));
ASSERT_TRUE(memory.get() == nullptr);
}
TEST_F(MapInfoCreateMemoryTest, local_memory) {
// Set up some memory for a valid local memory object.
std::vector<uint8_t> buffer(1024);
for (size_t i = 0; i < buffer.size(); i++) {
buffer[i] = i % 256;
}
MapInfo info;
info.start = reinterpret_cast<uint64_t>(buffer.data());
info.end = info.start + buffer.size();
info.offset = 0;
std::unique_ptr<Memory> memory;
memory.reset(info.CreateMemory(getpid()));
ASSERT_TRUE(memory.get() != nullptr);
std::vector<uint8_t> read_buffer(1024);
ASSERT_TRUE(memory->Read(0, read_buffer.data(), read_buffer.size()));
for (size_t i = 0; i < read_buffer.size(); i++) {
ASSERT_EQ(i % 256, read_buffer[i]) << "Failed at byte " << i;
}
ASSERT_FALSE(memory->Read(read_buffer.size(), read_buffer.data(), 1));
}
TEST_F(MapInfoCreateMemoryTest, remote_memory) {
std::vector<uint8_t> buffer(1024);
memset(buffer.data(), 0xa, buffer.size());
pid_t pid;
if ((pid = fork()) == 0) {
while (true)
;
exit(1);
}
ASSERT_LT(0, pid);
ASSERT_TRUE(ptrace(PTRACE_ATTACH, pid, 0, 0) != -1);
uint64_t iterations = 0;
siginfo_t si;
while (TEMP_FAILURE_RETRY(ptrace(PTRACE_GETSIGINFO, pid, 0, &si)) < 0 && errno == ESRCH) {
usleep(30);
iterations++;
ASSERT_LT(iterations, 500000000ULL);
}
MapInfo info;
info.start = reinterpret_cast<uint64_t>(buffer.data());
info.end = info.start + buffer.size();
info.offset = 0;
std::unique_ptr<Memory> memory;
memory.reset(info.CreateMemory(pid));
ASSERT_TRUE(memory.get() != nullptr);
// Set the local memory to a different value to guarantee we are reading
// from the remote process.
memset(buffer.data(), 0x1, buffer.size());
std::vector<uint8_t> read_buffer(1024);
ASSERT_TRUE(memory->Read(0, read_buffer.data(), read_buffer.size()));
for (size_t i = 0; i < read_buffer.size(); i++) {
ASSERT_EQ(0xaU, read_buffer[i]) << "Failed at byte " << i;
}
ASSERT_TRUE(ptrace(PTRACE_DETACH, pid, 0, 0) == 0);
kill(pid, SIGKILL);
ASSERT_EQ(pid, wait(nullptr));
}
} // namespace unwindstack