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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "elf_file.h"
#include <limits.h>
#include <stdio.h>
#include <unistd.h>
#include <string>
#include <vector>
#include "debug.h"
#include "elf_traits.h"
#include "gtest/gtest.h"
namespace {
void GetDataFilePath(const char* name, std::string* path) {
std::string data_dir;
const char* bindir = getenv("bindir");
if (bindir) {
data_dir = std::string(bindir);
} else {
char path[PATH_MAX];
memset(path, 0, sizeof(path));
ASSERT_NE(-1, readlink("/proc/self/exe", path, sizeof(path) - 1));
data_dir = std::string(path);
size_t pos = data_dir.rfind('/');
ASSERT_NE(std::string::npos, pos);
data_dir.erase(pos);
}
*path = data_dir + "/" + name;
}
void OpenRelocsTestFile(const char* name, FILE** stream) {
std::string path;
GetDataFilePath(name, &path);
FILE* testfile = fopen(path.c_str(), "rb");
ASSERT_FALSE(testfile == NULL) << "Error opening '" << path << "'";
FILE* temporary = tmpfile();
ASSERT_FALSE(temporary == NULL);
static const size_t buffer_size = 4096;
unsigned char buffer[buffer_size];
size_t bytes;
do {
bytes = fread(buffer, 1, sizeof(buffer), testfile);
ASSERT_EQ(bytes, fwrite(buffer, 1, bytes, temporary));
} while (bytes > 0);
ASSERT_EQ(0, fclose(testfile));
ASSERT_EQ(0, fseek(temporary, 0, SEEK_SET));
ASSERT_EQ(0, lseek(fileno(temporary), 0, SEEK_SET));
*stream = temporary;
}
void OpenRelocsTestFiles(const std::string& arch, FILE** relocs_so, FILE** packed_relocs_so) {
const std::string base = std::string("elf_file_unittest_relocs_") + arch;
const std::string relocs = base + ".so";
const std::string packed_relocs = base + "_packed.so";
OpenRelocsTestFile(relocs.c_str(), relocs_so);
OpenRelocsTestFile(packed_relocs.c_str(), packed_relocs_so);
}
void CloseRelocsTestFile(FILE* temporary) {
fclose(temporary);
}
void CloseRelocsTestFiles(FILE* relocs_so, FILE* packed_relocs_so) {
CloseRelocsTestFile(relocs_so);
CloseRelocsTestFile(packed_relocs_so);
}
void CheckFileContentsEqual(FILE* first, FILE* second) {
ASSERT_EQ(0, fseek(first, 0, SEEK_SET));
ASSERT_EQ(0, fseek(second, 0, SEEK_SET));
static const size_t buffer_size = 4096;
unsigned char first_buffer[buffer_size];
unsigned char second_buffer[buffer_size];
do {
size_t first_read = fread(first_buffer, 1, sizeof(first_buffer), first);
size_t second_read = fread(second_buffer, 1, sizeof(second_buffer), second);
EXPECT_EQ(first_read, second_read);
EXPECT_EQ(0, memcmp(first_buffer, second_buffer, first_read));
} while (!feof(first) && !feof(second));
EXPECT_TRUE(feof(first) && feof(second));
}
template <typename ELF>
static void ProcessUnpack(FILE* relocs_so, FILE* packed_relocs_so) {
relocation_packer::ElfFile<ELF> elf_file(fileno(packed_relocs_so));
// Ensure packing already packed elf-file does not fail the build.
EXPECT_TRUE(elf_file.PackRelocations());
// Unpack golden relocations, and check files are now identical.
EXPECT_TRUE(elf_file.UnpackRelocations());
CheckFileContentsEqual(packed_relocs_so, relocs_so);
CloseRelocsTestFiles(relocs_so, packed_relocs_so);
}
static void RunUnpackRelocationsTestFor(const std::string& arch) {
ASSERT_NE(static_cast<uint32_t>(EV_NONE), elf_version(EV_CURRENT));
FILE* relocs_so = NULL;
FILE* packed_relocs_so = NULL;
OpenRelocsTestFiles(arch, &relocs_so, &packed_relocs_so);
if (relocs_so != NULL && packed_relocs_so != NULL) {
// lets detect elf class
ASSERT_EQ(0, fseek(relocs_so, EI_CLASS, SEEK_SET))
<< "Invalid file length: " << strerror(errno);
uint8_t elf_class = 0;
ASSERT_EQ(1U, fread(&elf_class, 1, 1, relocs_so));
ASSERT_EQ(0, fseek(relocs_so, 0, SEEK_SET));
if (elf_class == ELFCLASS32) {
ProcessUnpack<ELF32_traits>(relocs_so, packed_relocs_so);
} else {
ProcessUnpack<ELF64_traits>(relocs_so, packed_relocs_so);
}
}
}
template <typename ELF>
static void ProcessPack(FILE* relocs_so, FILE* packed_relocs_so) {
relocation_packer::ElfFile<ELF> elf_file(fileno(relocs_so));
// Ensure unpacking fails (not packed).
EXPECT_FALSE(elf_file.UnpackRelocations());
// Pack relocations, and check files are now identical.
EXPECT_TRUE(elf_file.PackRelocations());
CheckFileContentsEqual(relocs_so, packed_relocs_so);
CloseRelocsTestFiles(relocs_so, packed_relocs_so);
}
static void RunPackRelocationsTestFor(const std::string& arch) {
ASSERT_NE(static_cast<uint32_t>(EV_NONE), elf_version(EV_CURRENT));
FILE* relocs_so = NULL;
FILE* packed_relocs_so = NULL;
OpenRelocsTestFiles(arch, &relocs_so, &packed_relocs_so);
if (relocs_so != NULL && packed_relocs_so != NULL) {
// lets detect elf class
ASSERT_EQ(0, fseek(packed_relocs_so, EI_CLASS, SEEK_SET))
<< "Invalid file length: " << strerror(errno);
uint8_t elf_class = 0;
ASSERT_EQ(1U, fread(&elf_class, 1, 1, packed_relocs_so));
fseek(packed_relocs_so, 0, SEEK_SET);
if (elf_class == ELFCLASS32) {
ProcessPack<ELF32_traits>(relocs_so, packed_relocs_so);
} else {
ProcessPack<ELF64_traits>(relocs_so, packed_relocs_so);
}
}
}
} // namespace
namespace relocation_packer {
TEST(ElfFile, PackRelocationsArm32) {
RunPackRelocationsTestFor("arm32");
}
TEST(ElfFile, PackRelocationsArm64) {
RunPackRelocationsTestFor("arm64");
}
TEST(ElfFile, UnpackRelocationsArm32) {
RunUnpackRelocationsTestFor("arm32");
}
TEST(ElfFile, UnpackRelocationsArm64) {
RunUnpackRelocationsTestFor("arm64");
}
} // namespace relocation_packer
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