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platform_system_core/libunwindstack/tests/ElfCacheTest.cpp
Christopher Ferris d9575b668b Modify elf cache to handle elf_offsets properly. 
Bug: 73498823

Test: All unit tests pass.
Test: Simpleperf run that previously failed, passes now.
Change-Id: Iff3a1f2f641a46ab9a0326579af3649f0c76fc65
2018-02-16 14:52:38 -08:00

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/*
* Copyright (C) 2018 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 <unistd.h>
#include <android-base/file.h>
#include <android-base/test_utils.h>
#include <gtest/gtest.h>
#include <unwindstack/Elf.h>
#include <unwindstack/MapInfo.h>
#include "ElfTestUtils.h"
#include "MemoryFake.h"
namespace unwindstack {
class ElfCacheTest : public ::testing::Test {
protected:
static void SetUpTestCase() { memory_.reset(new MemoryFake); }
void SetUp() override { Elf::SetCachingEnabled(true); }
void TearDown() override { Elf::SetCachingEnabled(false); }
void WriteElfFile(uint64_t offset, TemporaryFile* tf, uint32_t type) {
ASSERT_TRUE(type == EM_ARM || type == EM_386 || type == EM_X86_64);
size_t ehdr_size;
Elf32_Ehdr ehdr32;
Elf64_Ehdr ehdr64;
void* ptr;
if (type == EM_ARM || type == EM_386) {
ehdr_size = sizeof(ehdr32);
ptr = &ehdr32;
TestInitEhdr(&ehdr32, ELFCLASS32, type);
} else {
ehdr_size = sizeof(ehdr64);
ptr = &ehdr64;
TestInitEhdr(&ehdr64, ELFCLASS64, type);
}
ASSERT_EQ(offset, static_cast<uint64_t>(lseek(tf->fd, offset, SEEK_SET)));
ASSERT_TRUE(android::base::WriteFully(tf->fd, ptr, ehdr_size));
}
void VerifyWithinSameMap(bool cache_enabled);
void VerifySameMap(bool cache_enabled);
void VerifyWithinSameMapNeverReadAtZero(bool cache_enabled);
static std::shared_ptr<Memory> memory_;
};
std::shared_ptr<Memory> ElfCacheTest::memory_;
void ElfCacheTest::VerifySameMap(bool cache_enabled) {
if (!cache_enabled) {
Elf::SetCachingEnabled(false);
}
TemporaryFile tf;
ASSERT_TRUE(tf.fd != -1);
WriteElfFile(0, &tf, EM_ARM);
close(tf.fd);
uint64_t start = 0x1000;
uint64_t end = 0x20000;
MapInfo info1(start, end, 0, 0x5, tf.path);
MapInfo info2(start, end, 0, 0x5, tf.path);
Elf* elf1 = info1.GetElf(memory_, true);
ASSERT_TRUE(elf1->valid());
Elf* elf2 = info2.GetElf(memory_, true);
ASSERT_TRUE(elf2->valid());
if (cache_enabled) {
EXPECT_EQ(elf1, elf2);
} else {
EXPECT_NE(elf1, elf2);
}
}
TEST_F(ElfCacheTest, no_caching) {
VerifySameMap(false);
}
TEST_F(ElfCacheTest, caching_invalid_elf) {
VerifySameMap(true);
}
void ElfCacheTest::VerifyWithinSameMap(bool cache_enabled) {
if (!cache_enabled) {
Elf::SetCachingEnabled(false);
}
TemporaryFile tf;
ASSERT_TRUE(tf.fd != -1);
WriteElfFile(0, &tf, EM_ARM);
WriteElfFile(0x100, &tf, EM_386);
WriteElfFile(0x200, &tf, EM_X86_64);
lseek(tf.fd, 0x500, SEEK_SET);
uint8_t value = 0;
write(tf.fd, &value, 1);
close(tf.fd);
uint64_t start = 0x1000;
uint64_t end = 0x20000;
// Will have an elf at offset 0 in file.
MapInfo info0_1(start, end, 0, 0x5, tf.path);
MapInfo info0_2(start, end, 0, 0x5, tf.path);
// Will have an elf at offset 0x100 in file.
MapInfo info100_1(start, end, 0x100, 0x5, tf.path);
MapInfo info100_2(start, end, 0x100, 0x5, tf.path);
// Will have an elf at offset 0x200 in file.
MapInfo info200_1(start, end, 0x200, 0x5, tf.path);
MapInfo info200_2(start, end, 0x200, 0x5, tf.path);
// Will have an elf at offset 0 in file.
MapInfo info300_1(start, end, 0x300, 0x5, tf.path);
MapInfo info300_2(start, end, 0x300, 0x5, tf.path);
Elf* elf0_1 = info0_1.GetElf(memory_, true);
ASSERT_TRUE(elf0_1->valid());
EXPECT_EQ(ARCH_ARM, elf0_1->arch());
Elf* elf0_2 = info0_2.GetElf(memory_, true);
ASSERT_TRUE(elf0_2->valid());
EXPECT_EQ(ARCH_ARM, elf0_2->arch());
EXPECT_EQ(0U, info0_1.elf_offset);
EXPECT_EQ(0U, info0_2.elf_offset);
if (cache_enabled) {
EXPECT_EQ(elf0_1, elf0_2);
} else {
EXPECT_NE(elf0_1, elf0_2);
}
Elf* elf100_1 = info100_1.GetElf(memory_, true);
ASSERT_TRUE(elf100_1->valid());
EXPECT_EQ(ARCH_X86, elf100_1->arch());
Elf* elf100_2 = info100_2.GetElf(memory_, true);
ASSERT_TRUE(elf100_2->valid());
EXPECT_EQ(ARCH_X86, elf100_2->arch());
EXPECT_EQ(0U, info100_1.elf_offset);
EXPECT_EQ(0U, info100_2.elf_offset);
if (cache_enabled) {
EXPECT_EQ(elf100_1, elf100_2);
} else {
EXPECT_NE(elf100_1, elf100_2);
}
Elf* elf200_1 = info200_1.GetElf(memory_, true);
ASSERT_TRUE(elf200_1->valid());
EXPECT_EQ(ARCH_X86_64, elf200_1->arch());
Elf* elf200_2 = info200_2.GetElf(memory_, true);
ASSERT_TRUE(elf200_2->valid());
EXPECT_EQ(ARCH_X86_64, elf200_2->arch());
EXPECT_EQ(0U, info200_1.elf_offset);
EXPECT_EQ(0U, info200_2.elf_offset);
if (cache_enabled) {
EXPECT_EQ(elf200_1, elf200_2);
} else {
EXPECT_NE(elf200_1, elf200_2);
}
Elf* elf300_1 = info300_1.GetElf(memory_, true);
ASSERT_TRUE(elf300_1->valid());
EXPECT_EQ(ARCH_ARM, elf300_1->arch());
Elf* elf300_2 = info300_2.GetElf(memory_, true);
ASSERT_TRUE(elf300_2->valid());
EXPECT_EQ(ARCH_ARM, elf300_2->arch());
EXPECT_EQ(0x300U, info300_1.elf_offset);
EXPECT_EQ(0x300U, info300_2.elf_offset);
if (cache_enabled) {
EXPECT_EQ(elf300_1, elf300_2);
EXPECT_EQ(elf0_1, elf300_1);
} else {
EXPECT_NE(elf300_1, elf300_2);
EXPECT_NE(elf0_1, elf300_1);
}
}
TEST_F(ElfCacheTest, no_caching_valid_elf_offset_non_zero) {
VerifyWithinSameMap(false);
}
TEST_F(ElfCacheTest, caching_valid_elf_offset_non_zero) {
VerifyWithinSameMap(true);
}
// Verify that when reading from multiple non-zero offsets in the same map
// that when cached, all of the elf objects are the same.
void ElfCacheTest::VerifyWithinSameMapNeverReadAtZero(bool cache_enabled) {
if (!cache_enabled) {
Elf::SetCachingEnabled(false);
}
TemporaryFile tf;
ASSERT_TRUE(tf.fd != -1);
WriteElfFile(0, &tf, EM_ARM);
lseek(tf.fd, 0x500, SEEK_SET);
uint8_t value = 0;
write(tf.fd, &value, 1);
close(tf.fd);
uint64_t start = 0x1000;
uint64_t end = 0x20000;
// Multiple info sections at different offsets will have non-zero elf offsets.
MapInfo info300_1(start, end, 0x300, 0x5, tf.path);
MapInfo info300_2(start, end, 0x300, 0x5, tf.path);
MapInfo info400_1(start, end, 0x400, 0x5, tf.path);
MapInfo info400_2(start, end, 0x400, 0x5, tf.path);
Elf* elf300_1 = info300_1.GetElf(memory_, true);
ASSERT_TRUE(elf300_1->valid());
EXPECT_EQ(ARCH_ARM, elf300_1->arch());
Elf* elf300_2 = info300_2.GetElf(memory_, true);
ASSERT_TRUE(elf300_2->valid());
EXPECT_EQ(ARCH_ARM, elf300_2->arch());
EXPECT_EQ(0x300U, info300_1.elf_offset);
EXPECT_EQ(0x300U, info300_2.elf_offset);
if (cache_enabled) {
EXPECT_EQ(elf300_1, elf300_2);
} else {
EXPECT_NE(elf300_1, elf300_2);
}
Elf* elf400_1 = info400_1.GetElf(memory_, true);
ASSERT_TRUE(elf400_1->valid());
EXPECT_EQ(ARCH_ARM, elf400_1->arch());
Elf* elf400_2 = info400_2.GetElf(memory_, true);
ASSERT_TRUE(elf400_2->valid());
EXPECT_EQ(ARCH_ARM, elf400_2->arch());
EXPECT_EQ(0x400U, info400_1.elf_offset);
EXPECT_EQ(0x400U, info400_2.elf_offset);
if (cache_enabled) {
EXPECT_EQ(elf400_1, elf400_2);
EXPECT_EQ(elf300_1, elf400_1);
} else {
EXPECT_NE(elf400_1, elf400_2);
EXPECT_NE(elf300_1, elf400_1);
}
}
TEST_F(ElfCacheTest, no_caching_valid_elf_offset_non_zero_never_read_at_zero) {
VerifyWithinSameMapNeverReadAtZero(false);
}
TEST_F(ElfCacheTest, caching_valid_elf_offset_non_zero_never_read_at_zero) {
VerifyWithinSameMapNeverReadAtZero(true);
}
} // namespace unwindstack
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