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platform_system_core/libunwindstack/tests/ElfTest.cpp
Christopher Ferris bae69f1892 Add .gnu_debugdata support. 
Update the unwind_info tool to dump all of the sections.

Bug: 23762183

Test: Passes new unit tests.
Change-Id: I8b223bc208a1a2ef06ed333e6d96943c8f273681
2017-06-28 15:23:10 -07:00

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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 <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <gtest/gtest.h>
#include "Elf.h"
#include "MemoryFake.h"
#if !defined(PT_ARM_EXIDX)
#define PT_ARM_EXIDX 0x70000001
#endif
class ElfTest : public ::testing::Test {
protected:
void SetUp() override {
memory_ = new MemoryFake;
}
template <typename Ehdr>
void InitEhdr(Ehdr* ehdr) {
memset(ehdr, 0, sizeof(Ehdr));
memcpy(&ehdr->e_ident[0], ELFMAG, SELFMAG);
ehdr->e_ident[EI_DATA] = ELFDATA2LSB;
ehdr->e_ident[EI_VERSION] = EV_CURRENT;
ehdr->e_ident[EI_OSABI] = ELFOSABI_SYSV;
ehdr->e_type = ET_DYN;
ehdr->e_version = EV_CURRENT;
}
void InitElf32(uint32_t machine) {
Elf32_Ehdr ehdr;
InitEhdr<Elf32_Ehdr>(&ehdr);
ehdr.e_ident[EI_CLASS] = ELFCLASS32;
ehdr.e_machine = machine;
ehdr.e_entry = 0;
ehdr.e_phoff = 0x100;
ehdr.e_shoff = 0;
ehdr.e_flags = 0;
ehdr.e_ehsize = sizeof(ehdr);
ehdr.e_phentsize = sizeof(Elf32_Phdr);
ehdr.e_phnum = 1;
ehdr.e_shentsize = sizeof(Elf32_Shdr);
ehdr.e_shnum = 0;
ehdr.e_shstrndx = 0;
if (machine == EM_ARM) {
ehdr.e_flags = 0x5000200;
ehdr.e_phnum = 2;
}
memory_->SetMemory(0, &ehdr, sizeof(ehdr));
Elf32_Phdr phdr;
memset(&phdr, 0, sizeof(phdr));
phdr.p_type = PT_LOAD;
phdr.p_offset = 0;
phdr.p_vaddr = 0;
phdr.p_paddr = 0;
phdr.p_filesz = 0x10000;
phdr.p_memsz = 0x10000;
phdr.p_flags = PF_R | PF_X;
phdr.p_align = 0x1000;
memory_->SetMemory(0x100, &phdr, sizeof(phdr));
if (machine == EM_ARM) {
memset(&phdr, 0, sizeof(phdr));
phdr.p_type = PT_ARM_EXIDX;
phdr.p_offset = 0x30000;
phdr.p_vaddr = 0x30000;
phdr.p_paddr = 0x30000;
phdr.p_filesz = 16;
phdr.p_memsz = 16;
phdr.p_flags = PF_R;
phdr.p_align = 0x4;
memory_->SetMemory(0x100 + sizeof(phdr), &phdr, sizeof(phdr));
}
}
void InitElf64(uint32_t machine) {
Elf64_Ehdr ehdr;
InitEhdr<Elf64_Ehdr>(&ehdr);
ehdr.e_ident[EI_CLASS] = ELFCLASS64;
ehdr.e_machine = machine;
ehdr.e_entry = 0;
ehdr.e_phoff = 0x100;
ehdr.e_shoff = 0;
ehdr.e_flags = 0x5000200;
ehdr.e_ehsize = sizeof(ehdr);
ehdr.e_phentsize = sizeof(Elf64_Phdr);
ehdr.e_phnum = 1;
ehdr.e_shentsize = sizeof(Elf64_Shdr);
ehdr.e_shnum = 0;
ehdr.e_shstrndx = 0;
memory_->SetMemory(0, &ehdr, sizeof(ehdr));
Elf64_Phdr phdr;
memset(&phdr, 0, sizeof(phdr));
phdr.p_type = PT_LOAD;
phdr.p_offset = 0;
phdr.p_vaddr = 0;
phdr.p_paddr = 0;
phdr.p_filesz = 0x10000;
phdr.p_memsz = 0x10000;
phdr.p_flags = PF_R | PF_X;
phdr.p_align = 0x1000;
memory_->SetMemory(0x100, &phdr, sizeof(phdr));
}
template <typename Ehdr, typename Shdr>
void GnuDebugdataInitFail(Ehdr* ehdr);
template <typename Ehdr, typename Shdr>
void GnuDebugdataInit(Ehdr* ehdr);
MemoryFake* memory_;
};
TEST_F(ElfTest, invalid_memory) {
Elf elf(memory_);
ASSERT_FALSE(elf.Init());
ASSERT_FALSE(elf.valid());
}
TEST_F(ElfTest, elf_invalid) {
Elf elf(memory_);
InitElf32(EM_386);
// Corrupt the ELF signature.
memory_->SetData32(0, 0x7f000000);
ASSERT_FALSE(elf.Init());
ASSERT_FALSE(elf.valid());
ASSERT_TRUE(elf.interface() == nullptr);
std::string name;
ASSERT_FALSE(elf.GetSoname(&name));
uint64_t func_offset;
ASSERT_FALSE(elf.GetFunctionName(0, &name, &func_offset));
ASSERT_FALSE(elf.Step(0, nullptr, nullptr));
}
TEST_F(ElfTest, elf_arm) {
Elf elf(memory_);
InitElf32(EM_ARM);
ASSERT_TRUE(elf.Init());
ASSERT_TRUE(elf.valid());
ASSERT_EQ(static_cast<uint32_t>(EM_ARM), elf.machine_type());
ASSERT_EQ(ELFCLASS32, elf.class_type());
ASSERT_TRUE(elf.interface() != nullptr);
}
TEST_F(ElfTest, elf_x86) {
Elf elf(memory_);
InitElf32(EM_386);
ASSERT_TRUE(elf.Init());
ASSERT_TRUE(elf.valid());
ASSERT_EQ(static_cast<uint32_t>(EM_386), elf.machine_type());
ASSERT_EQ(ELFCLASS32, elf.class_type());
ASSERT_TRUE(elf.interface() != nullptr);
}
TEST_F(ElfTest, elf_arm64) {
Elf elf(memory_);
InitElf64(EM_AARCH64);
ASSERT_TRUE(elf.Init());
ASSERT_TRUE(elf.valid());
ASSERT_EQ(static_cast<uint32_t>(EM_AARCH64), elf.machine_type());
ASSERT_EQ(ELFCLASS64, elf.class_type());
ASSERT_TRUE(elf.interface() != nullptr);
}
TEST_F(ElfTest, elf_x86_64) {
Elf elf(memory_);
InitElf64(EM_X86_64);
ASSERT_TRUE(elf.Init());
ASSERT_TRUE(elf.valid());
ASSERT_EQ(static_cast<uint32_t>(EM_X86_64), elf.machine_type());
ASSERT_EQ(ELFCLASS64, elf.class_type());
ASSERT_TRUE(elf.interface() != nullptr);
}
template <typename Ehdr, typename Shdr>
void ElfTest::GnuDebugdataInitFail(Ehdr* ehdr) {
Elf elf(memory_);
uint64_t offset = 0x2000;
ehdr->e_shoff = offset;
ehdr->e_shnum = 3;
ehdr->e_shentsize = sizeof(Shdr);
ehdr->e_shstrndx = 2;
memory_->SetMemory(0, ehdr, sizeof(*ehdr));
Shdr shdr;
memset(&shdr, 0, sizeof(shdr));
shdr.sh_type = SHT_NULL;
memory_->SetMemory(offset, &shdr, sizeof(shdr));
offset += ehdr->e_shentsize;
memset(&shdr, 0, sizeof(shdr));
shdr.sh_type = SHT_PROGBITS;
shdr.sh_name = 0x100;
shdr.sh_addr = 0x5000;
shdr.sh_offset = 0x5000;
shdr.sh_entsize = 0x100;
shdr.sh_size = 0x800;
memory_->SetMemory(offset, &shdr, sizeof(shdr));
offset += ehdr->e_shentsize;
memset(&shdr, 0, sizeof(shdr));
shdr.sh_type = SHT_STRTAB;
shdr.sh_name = 0x200000;
shdr.sh_offset = 0xf000;
shdr.sh_size = 0x1000;
memory_->SetMemory(offset, &shdr, sizeof(shdr));
offset += ehdr->e_shentsize;
memory_->SetMemory(0xf100, ".gnu_debugdata", sizeof(".gnu_debugdata"));
ASSERT_TRUE(elf.Init());
ASSERT_TRUE(elf.interface() != nullptr);
ASSERT_TRUE(elf.gnu_debugdata_interface() == nullptr);
EXPECT_EQ(0x5000U, elf.interface()->gnu_debugdata_offset());
EXPECT_EQ(0x800U, elf.interface()->gnu_debugdata_size());
elf.InitGnuDebugdata();
}
TEST_F(ElfTest, gnu_debugdata_init_fail32) {
Elf32_Ehdr ehdr;
InitEhdr<Elf32_Ehdr>(&ehdr);
ehdr.e_ident[EI_CLASS] = ELFCLASS32;
ehdr.e_machine = EM_ARM;
GnuDebugdataInitFail<Elf32_Ehdr, Elf32_Shdr>(&ehdr);
}
TEST_F(ElfTest, gnu_debugdata_init_fail64) {
Elf64_Ehdr ehdr;
InitEhdr<Elf64_Ehdr>(&ehdr);
ehdr.e_ident[EI_CLASS] = ELFCLASS64;
ehdr.e_machine = EM_AARCH64;
GnuDebugdataInitFail<Elf64_Ehdr, Elf64_Shdr>(&ehdr);
}
template <typename Ehdr, typename Shdr>
void ElfTest::GnuDebugdataInit(Ehdr* ehdr) {
Elf elf(memory_);
uint64_t offset = 0x2000;
ehdr->e_shoff = offset;
ehdr->e_shnum = 3;
ehdr->e_shentsize = sizeof(Shdr);
ehdr->e_shstrndx = 2;
memory_->SetMemory(0, ehdr, sizeof(*ehdr));
Shdr shdr;
memset(&shdr, 0, sizeof(shdr));
shdr.sh_type = SHT_NULL;
memory_->SetMemory(offset, &shdr, sizeof(shdr));
offset += ehdr->e_shentsize;
uint64_t gnu_offset = offset;
offset += ehdr->e_shentsize;
memset(&shdr, 0, sizeof(shdr));
shdr.sh_type = SHT_STRTAB;
shdr.sh_name = 0x200000;
shdr.sh_offset = 0xf000;
shdr.sh_size = 0x1000;
memory_->SetMemory(offset, &shdr, sizeof(shdr));
offset += ehdr->e_shentsize;
memory_->SetMemory(0xf100, ".gnu_debugdata", sizeof(".gnu_debugdata"));
// Read in the compressed elf data and put it in our fake memory.
std::string name("tests/");
if (sizeof(Ehdr) == sizeof(Elf32_Ehdr)) {
name += "elf32.xz";
} else {
name += "elf64.xz";
}
int fd = TEMP_FAILURE_RETRY(open(name.c_str(), O_RDONLY));
ASSERT_NE(-1, fd) << "Cannot open " + name;
// Assumes the file is less than 1024 bytes.
std::vector<uint8_t> buf(1024);
ssize_t bytes = TEMP_FAILURE_RETRY(read(fd, buf.data(), buf.size()));
ASSERT_GT(bytes, 0);
// Make sure the file isn't too big.
ASSERT_NE(static_cast<size_t>(bytes), buf.size())
<< "File " + name + " is too big, increase buffer size.";
close(fd);
buf.resize(bytes);
memory_->SetMemory(0x5000, buf);
memset(&shdr, 0, sizeof(shdr));
shdr.sh_type = SHT_PROGBITS;
shdr.sh_name = 0x100;
shdr.sh_addr = 0x5000;
shdr.sh_offset = 0x5000;
shdr.sh_size = bytes;
memory_->SetMemory(gnu_offset, &shdr, sizeof(shdr));
ASSERT_TRUE(elf.Init());
ASSERT_TRUE(elf.interface() != nullptr);
ASSERT_TRUE(elf.gnu_debugdata_interface() == nullptr);
EXPECT_EQ(0x5000U, elf.interface()->gnu_debugdata_offset());
elf.InitGnuDebugdata();
ASSERT_TRUE(elf.gnu_debugdata_interface() != nullptr);
}
TEST_F(ElfTest, gnu_debugdata_init32) {
Elf32_Ehdr ehdr;
InitEhdr<Elf32_Ehdr>(&ehdr);
ehdr.e_ident[EI_CLASS] = ELFCLASS32;
ehdr.e_machine = EM_ARM;
GnuDebugdataInit<Elf32_Ehdr, Elf32_Shdr>(&ehdr);
}
TEST_F(ElfTest, gnu_debugdata_init64) {
Elf64_Ehdr ehdr;
InitEhdr<Elf64_Ehdr>(&ehdr);
ehdr.e_ident[EI_CLASS] = ELFCLASS64;
ehdr.e_machine = EM_AARCH64;
GnuDebugdataInit<Elf64_Ehdr, Elf64_Shdr>(&ehdr);
}
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