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/*
* Copyright (C) 2019 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 <string.h>
#include <sys/mman.h>
#include <unistd.h>
#include <atomic>
#include <memory>
#include <string>
#include <thread>
#include <vector>
#include <android-base/test_utils.h>
#include <gtest/gtest.h>
#include <unwindstack/Elf.h>
#include <unwindstack/MapInfo.h>
#include <unwindstack/Maps.h>
#include <unwindstack/Memory.h>
#include "ElfFake.h"
#include "ElfTestUtils.h"
#include "MemoryFake.h"
namespace unwindstack {
class MapInfoGetBuildIDTest : public ::testing::Test {
protected:
void SetUp() override {
tf_.reset(new TemporaryFile);
memory_ = new MemoryFake;
elf_ = new ElfFake(new MemoryFake);
elf_interface_ = new ElfInterfaceFake(memory_);
elf_->FakeSetInterface(elf_interface_);
elf_container_.reset(elf_);
map_info_.reset(new MapInfo(nullptr, 0x1000, 0x20000, 0, PROT_READ | PROT_WRITE, tf_->path));
}
void MultipleThreadTest(std::string expected_build_id);
MemoryFake* memory_;
ElfFake* elf_;
ElfInterfaceFake* elf_interface_;
std::unique_ptr<ElfFake> elf_container_;
std::unique_ptr<MapInfo> map_info_;
std::unique_ptr<TemporaryFile> tf_;
};
TEST_F(MapInfoGetBuildIDTest, no_elf_and_no_valid_elf_in_memory) {
MapInfo info(nullptr, 0x1000, 0x2000, 0, PROT_READ, "");
EXPECT_EQ("", info.GetBuildID());
EXPECT_EQ("", info.GetPrintableBuildID());
}
TEST_F(MapInfoGetBuildIDTest, from_elf) {
map_info_->elf.reset(elf_container_.release());
elf_interface_->FakeSetBuildID("FAKE_BUILD_ID");
EXPECT_EQ("FAKE_BUILD_ID", map_info_->GetBuildID());
EXPECT_EQ("46414b455f4255494c445f4944", map_info_->GetPrintableBuildID());
}
void MapInfoGetBuildIDTest::MultipleThreadTest(std::string expected_build_id) {
static constexpr size_t kNumConcurrentThreads = 100;
std::string build_id_values[kNumConcurrentThreads];
std::vector<std::thread*> threads;
std::atomic_bool wait;
wait = true;
// Create all of the threads and have them do the GetLoadBias at the same time
// to make it likely that a race will occur.
for (size_t i = 0; i < kNumConcurrentThreads; i++) {
std::thread* thread = new std::thread([i, this, &wait, &build_id_values]() {
while (wait)
;
build_id_values[i] = map_info_->GetBuildID();
});
threads.push_back(thread);
}
// Set them all going and wait for the threads to finish.
wait = false;
for (auto thread : threads) {
thread->join();
delete thread;
}
// Now verify that all of the elf files are exactly the same and valid.
for (size_t i = 0; i < kNumConcurrentThreads; i++) {
EXPECT_EQ(expected_build_id, build_id_values[i]) << "Thread " << i << " mismatched.";
}
}
TEST_F(MapInfoGetBuildIDTest, multiple_thread_elf_exists) {
map_info_->elf.reset(elf_container_.release());
elf_interface_->FakeSetBuildID("FAKE_BUILD_ID");
MultipleThreadTest("FAKE_BUILD_ID");
}
static void InitElfData(int fd) {
Elf32_Ehdr ehdr;
TestInitEhdr(&ehdr, ELFCLASS32, EM_ARM);
ehdr.e_shoff = 0x2000;
ehdr.e_shnum = 3;
ehdr.e_shentsize = sizeof(Elf32_Shdr);
ehdr.e_shstrndx = 2;
off_t offset = 0;
ASSERT_EQ(offset, lseek(fd, offset, SEEK_SET));
ASSERT_EQ(static_cast<ssize_t>(sizeof(ehdr)), write(fd, &ehdr, sizeof(ehdr)));
char note_section[128];
Elf32_Nhdr note_header = {};
note_header.n_namesz = 4; // "GNU"
note_header.n_descsz = 12; // "ELF_BUILDID"
note_header.n_type = NT_GNU_BUILD_ID;
memcpy(¬e_section, ¬e_header, sizeof(note_header));
size_t note_offset = sizeof(note_header);
memcpy(¬e_section[note_offset], "GNU", sizeof("GNU"));
note_offset += sizeof("GNU");
memcpy(¬e_section[note_offset], "ELF_BUILDID", sizeof("ELF_BUILDID"));
note_offset += sizeof("ELF_BUILDID");
Elf32_Shdr shdr = {};
shdr.sh_type = SHT_NOTE;
shdr.sh_name = 0x500;
shdr.sh_offset = 0xb000;
shdr.sh_size = sizeof(note_section);
offset += ehdr.e_shoff + sizeof(shdr);
ASSERT_EQ(offset, lseek(fd, offset, SEEK_SET));
ASSERT_EQ(static_cast<ssize_t>(sizeof(shdr)), write(fd, &shdr, sizeof(shdr)));
// The string data for section header names.
memset(&shdr, 0, sizeof(shdr));
shdr.sh_type = SHT_STRTAB;
shdr.sh_name = 0x20000;
shdr.sh_offset = 0xf000;
shdr.sh_size = 0x1000;
offset += sizeof(shdr);
ASSERT_EQ(offset, lseek(fd, offset, SEEK_SET));
ASSERT_EQ(static_cast<ssize_t>(sizeof(shdr)), write(fd, &shdr, sizeof(shdr)));
offset = 0xf500;
ASSERT_EQ(offset, lseek(fd, offset, SEEK_SET));
ASSERT_EQ(static_cast<ssize_t>(sizeof(".note.gnu.build-id")),
write(fd, ".note.gnu.build-id", sizeof(".note.gnu.build-id")));
offset = 0xb000;
ASSERT_EQ(offset, lseek(fd, offset, SEEK_SET));
ASSERT_EQ(static_cast<ssize_t>(sizeof(note_section)),
write(fd, note_section, sizeof(note_section)));
}
TEST_F(MapInfoGetBuildIDTest, from_memory) {
InitElfData(tf_->fd);
EXPECT_EQ("ELF_BUILDID", map_info_->GetBuildID());
EXPECT_EQ("454c465f4255494c444944", map_info_->GetPrintableBuildID());
}
TEST_F(MapInfoGetBuildIDTest, multiple_thread_elf_exists_in_memory) {
InitElfData(tf_->fd);
MultipleThreadTest("ELF_BUILDID");
}
} // namespace unwindstack
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