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platform_system_core/libunwindstack/tests/ElfInterfaceTest.cpp
Christopher Ferris 150db124f3 Add ability to read jit gdb data. 
Changes:
- New JitDebug class to handle all of the jit gdb interface.
- Add unit tests for all, along with new offline test using debug data.
- Add new Memory type called MemoryOfflineParts that has multiple
  MemoryOffline objects to support the offline test.
- Update the tools to use the JitDebug object.
- Modify libbacktrace to use the JitDebug, but only looking in libart.so
  and libartd.so.
- Change the Format32Bits to Is32Bit since it's more accurate and I use
  it in a different context where original name didn't make sense.
- Add a new function to find global variables in an elf file
  (GetGlobalVariable).
- Add a new function to determine if a pc is valid for this elf (IsValidPc).

Bug: 68396769

Test: Ran new unit tests. Added new offline test that uses jit debug data.
Test: Ran art test that generates jit data and verified a crash unwinds
Test: through the jit data.
Change-Id: I6e7ee2f5bab2242028a06feece156dff21c0a974
2018-01-12 11:18:42 -08:00

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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 <memory>
#include <gtest/gtest.h>
#include <unwindstack/ElfInterface.h>
#include "DwarfEncoding.h"
#include "ElfInterfaceArm.h"
#include "ElfFake.h"
#include "MemoryFake.h"
#if !defined(PT_ARM_EXIDX)
#define PT_ARM_EXIDX 0x70000001
#endif
#if !defined(EM_AARCH64)
#define EM_AARCH64 183
#endif
namespace unwindstack {
class ElfInterfaceTest : public ::testing::Test {
protected:
void SetUp() override {
memory_.Clear();
}
void SetStringMemory(uint64_t offset, const char* string) {
memory_.SetMemory(offset, string, strlen(string) + 1);
}
template <typename Ehdr, typename Phdr, typename Dyn, typename ElfInterfaceType>
void SinglePtLoad();
template <typename Ehdr, typename Phdr, typename Dyn, typename ElfInterfaceType>
void MultipleExecutablePtLoads();
template <typename Ehdr, typename Phdr, typename Dyn, typename ElfInterfaceType>
void MultipleExecutablePtLoadsIncrementsNotSizeOfPhdr();
template <typename Ehdr, typename Phdr, typename Dyn, typename ElfInterfaceType>
void NonExecutablePtLoads();
template <typename Ehdr, typename Phdr, typename Dyn, typename ElfInterfaceType>
void ManyPhdrs();
template <typename Ehdr, typename Phdr, typename Dyn, typename ElfInterfaceType>
void Soname();
template <typename Ehdr, typename Phdr, typename Dyn, typename ElfInterfaceType>
void SonameAfterDtNull();
template <typename Ehdr, typename Phdr, typename Dyn, typename ElfInterfaceType>
void SonameSize();
template <typename ElfType>
void InitHeadersEhFrameTest();
template <typename ElfType>
void InitHeadersDebugFrame();
template <typename ElfType>
void InitHeadersEhFrameFail();
template <typename ElfType>
void InitHeadersDebugFrameFail();
template <typename Ehdr, typename Shdr, typename ElfInterfaceType>
void InitSectionHeadersMalformed();
template <typename Ehdr, typename Shdr, typename Sym, typename ElfInterfaceType>
void InitSectionHeaders(uint64_t entry_size);
template <typename Ehdr, typename Shdr, typename ElfInterfaceType>
void InitSectionHeadersOffsets();
template <typename Sym>
void InitSym(uint64_t offset, uint32_t value, uint32_t size, uint32_t name_offset,
uint64_t sym_offset, const char* name);
MemoryFake memory_;
};
template <typename Sym>
void ElfInterfaceTest::InitSym(uint64_t offset, uint32_t value, uint32_t size, uint32_t name_offset,
uint64_t sym_offset, const char* name) {
Sym sym;
memset(&sym, 0, sizeof(sym));
sym.st_info = STT_FUNC;
sym.st_value = value;
sym.st_size = size;
sym.st_name = name_offset;
sym.st_shndx = SHN_COMMON;
memory_.SetMemory(offset, &sym, sizeof(sym));
memory_.SetMemory(sym_offset + name_offset, name, strlen(name) + 1);
}
template <typename Ehdr, typename Phdr, typename Dyn, typename ElfInterfaceType>
void ElfInterfaceTest::SinglePtLoad() {
std::unique_ptr<ElfInterface> elf(new ElfInterfaceType(&memory_));
Ehdr ehdr;
memset(&ehdr, 0, sizeof(ehdr));
ehdr.e_phoff = 0x100;
ehdr.e_phnum = 1;
ehdr.e_phentsize = sizeof(Phdr);
memory_.SetMemory(0, &ehdr, sizeof(ehdr));
Phdr phdr;
memset(&phdr, 0, sizeof(phdr));
phdr.p_type = PT_LOAD;
phdr.p_vaddr = 0x2000;
phdr.p_memsz = 0x10000;
phdr.p_flags = PF_R | PF_X;
phdr.p_align = 0x1000;
memory_.SetMemory(0x100, &phdr, sizeof(phdr));
uint64_t load_bias = 0;
ASSERT_TRUE(elf->Init(&load_bias));
EXPECT_EQ(0x2000U, load_bias);
const std::unordered_map<uint64_t, LoadInfo>& pt_loads = elf->pt_loads();
ASSERT_EQ(1U, pt_loads.size());
LoadInfo load_data = pt_loads.at(0);
ASSERT_EQ(0U, load_data.offset);
ASSERT_EQ(0x2000U, load_data.table_offset);
ASSERT_EQ(0x10000U, load_data.table_size);
}
TEST_F(ElfInterfaceTest, elf32_single_pt_load) {
SinglePtLoad<Elf32_Ehdr, Elf32_Phdr, Elf32_Dyn, ElfInterface32>();
}
TEST_F(ElfInterfaceTest, elf64_single_pt_load) {
SinglePtLoad<Elf64_Ehdr, Elf64_Phdr, Elf64_Dyn, ElfInterface64>();
}
template <typename Ehdr, typename Phdr, typename Dyn, typename ElfInterfaceType>
void ElfInterfaceTest::MultipleExecutablePtLoads() {
std::unique_ptr<ElfInterface> elf(new ElfInterfaceType(&memory_));
Ehdr ehdr;
memset(&ehdr, 0, sizeof(ehdr));
ehdr.e_phoff = 0x100;
ehdr.e_phnum = 3;
ehdr.e_phentsize = sizeof(Phdr);
memory_.SetMemory(0, &ehdr, sizeof(ehdr));
Phdr phdr;
memset(&phdr, 0, sizeof(phdr));
phdr.p_type = PT_LOAD;
phdr.p_vaddr = 0x2000;
phdr.p_memsz = 0x10000;
phdr.p_flags = PF_R | PF_X;
phdr.p_align = 0x1000;
memory_.SetMemory(0x100, &phdr, sizeof(phdr));
memset(&phdr, 0, sizeof(phdr));
phdr.p_type = PT_LOAD;
phdr.p_offset = 0x1000;
phdr.p_vaddr = 0x2001;
phdr.p_memsz = 0x10001;
phdr.p_flags = PF_R | PF_X;
phdr.p_align = 0x1001;
memory_.SetMemory(0x100 + sizeof(phdr), &phdr, sizeof(phdr));
memset(&phdr, 0, sizeof(phdr));
phdr.p_type = PT_LOAD;
phdr.p_offset = 0x2000;
phdr.p_vaddr = 0x2002;
phdr.p_memsz = 0x10002;
phdr.p_flags = PF_R | PF_X;
phdr.p_align = 0x1002;
memory_.SetMemory(0x100 + 2 * sizeof(phdr), &phdr, sizeof(phdr));
uint64_t load_bias = 0;
ASSERT_TRUE(elf->Init(&load_bias));
EXPECT_EQ(0x2000U, load_bias);
const std::unordered_map<uint64_t, LoadInfo>& pt_loads = elf->pt_loads();
ASSERT_EQ(3U, pt_loads.size());
LoadInfo load_data = pt_loads.at(0);
ASSERT_EQ(0U, load_data.offset);
ASSERT_EQ(0x2000U, load_data.table_offset);
ASSERT_EQ(0x10000U, load_data.table_size);
load_data = pt_loads.at(0x1000);
ASSERT_EQ(0x1000U, load_data.offset);
ASSERT_EQ(0x2001U, load_data.table_offset);
ASSERT_EQ(0x10001U, load_data.table_size);
load_data = pt_loads.at(0x2000);
ASSERT_EQ(0x2000U, load_data.offset);
ASSERT_EQ(0x2002U, load_data.table_offset);
ASSERT_EQ(0x10002U, load_data.table_size);
}
TEST_F(ElfInterfaceTest, elf32_multiple_executable_pt_loads) {
MultipleExecutablePtLoads<Elf32_Ehdr, Elf32_Phdr, Elf32_Dyn, ElfInterface32>();
}
TEST_F(ElfInterfaceTest, elf64_multiple_executable_pt_loads) {
MultipleExecutablePtLoads<Elf64_Ehdr, Elf64_Phdr, Elf64_Dyn, ElfInterface64>();
}
template <typename Ehdr, typename Phdr, typename Dyn, typename ElfInterfaceType>
void ElfInterfaceTest::MultipleExecutablePtLoadsIncrementsNotSizeOfPhdr() {
std::unique_ptr<ElfInterface> elf(new ElfInterfaceType(&memory_));
Ehdr ehdr;
memset(&ehdr, 0, sizeof(ehdr));
ehdr.e_phoff = 0x100;
ehdr.e_phnum = 3;
ehdr.e_phentsize = sizeof(Phdr) + 100;
memory_.SetMemory(0, &ehdr, sizeof(ehdr));
Phdr phdr;
memset(&phdr, 0, sizeof(phdr));
phdr.p_type = PT_LOAD;
phdr.p_vaddr = 0x2000;
phdr.p_memsz = 0x10000;
phdr.p_flags = PF_R | PF_X;
phdr.p_align = 0x1000;
memory_.SetMemory(0x100, &phdr, sizeof(phdr));
memset(&phdr, 0, sizeof(phdr));
phdr.p_type = PT_LOAD;
phdr.p_offset = 0x1000;
phdr.p_vaddr = 0x2001;
phdr.p_memsz = 0x10001;
phdr.p_flags = PF_R | PF_X;
phdr.p_align = 0x1001;
memory_.SetMemory(0x100 + sizeof(phdr) + 100, &phdr, sizeof(phdr));
memset(&phdr, 0, sizeof(phdr));
phdr.p_type = PT_LOAD;
phdr.p_offset = 0x2000;
phdr.p_vaddr = 0x2002;
phdr.p_memsz = 0x10002;
phdr.p_flags = PF_R | PF_X;
phdr.p_align = 0x1002;
memory_.SetMemory(0x100 + 2 * (sizeof(phdr) + 100), &phdr, sizeof(phdr));
uint64_t load_bias = 0;
ASSERT_TRUE(elf->Init(&load_bias));
EXPECT_EQ(0x2000U, load_bias);
const std::unordered_map<uint64_t, LoadInfo>& pt_loads = elf->pt_loads();
ASSERT_EQ(3U, pt_loads.size());
LoadInfo load_data = pt_loads.at(0);
ASSERT_EQ(0U, load_data.offset);
ASSERT_EQ(0x2000U, load_data.table_offset);
ASSERT_EQ(0x10000U, load_data.table_size);
load_data = pt_loads.at(0x1000);
ASSERT_EQ(0x1000U, load_data.offset);
ASSERT_EQ(0x2001U, load_data.table_offset);
ASSERT_EQ(0x10001U, load_data.table_size);
load_data = pt_loads.at(0x2000);
ASSERT_EQ(0x2000U, load_data.offset);
ASSERT_EQ(0x2002U, load_data.table_offset);
ASSERT_EQ(0x10002U, load_data.table_size);
}
TEST_F(ElfInterfaceTest, elf32_multiple_executable_pt_loads_increments_not_size_of_phdr) {
MultipleExecutablePtLoadsIncrementsNotSizeOfPhdr<Elf32_Ehdr, Elf32_Phdr, Elf32_Dyn,
ElfInterface32>();
}
TEST_F(ElfInterfaceTest, elf64_multiple_executable_pt_loads_increments_not_size_of_phdr) {
MultipleExecutablePtLoadsIncrementsNotSizeOfPhdr<Elf64_Ehdr, Elf64_Phdr, Elf64_Dyn,
ElfInterface64>();
}
template <typename Ehdr, typename Phdr, typename Dyn, typename ElfInterfaceType>
void ElfInterfaceTest::NonExecutablePtLoads() {
std::unique_ptr<ElfInterface> elf(new ElfInterfaceType(&memory_));
Ehdr ehdr;
memset(&ehdr, 0, sizeof(ehdr));
ehdr.e_phoff = 0x100;
ehdr.e_phnum = 3;
ehdr.e_phentsize = sizeof(Phdr);
memory_.SetMemory(0, &ehdr, sizeof(ehdr));
Phdr phdr;
memset(&phdr, 0, sizeof(phdr));
phdr.p_type = PT_LOAD;
phdr.p_vaddr = 0x2000;
phdr.p_memsz = 0x10000;
phdr.p_flags = PF_R;
phdr.p_align = 0x1000;
memory_.SetMemory(0x100, &phdr, sizeof(phdr));
memset(&phdr, 0, sizeof(phdr));
phdr.p_type = PT_LOAD;
phdr.p_offset = 0x1000;
phdr.p_vaddr = 0x2001;
phdr.p_memsz = 0x10001;
phdr.p_flags = PF_R | PF_X;
phdr.p_align = 0x1001;
memory_.SetMemory(0x100 + sizeof(phdr), &phdr, sizeof(phdr));
memset(&phdr, 0, sizeof(phdr));
phdr.p_type = PT_LOAD;
phdr.p_offset = 0x2000;
phdr.p_vaddr = 0x2002;
phdr.p_memsz = 0x10002;
phdr.p_flags = PF_R;
phdr.p_align = 0x1002;
memory_.SetMemory(0x100 + 2 * sizeof(phdr), &phdr, sizeof(phdr));
uint64_t load_bias = 0;
ASSERT_TRUE(elf->Init(&load_bias));
EXPECT_EQ(0U, load_bias);
const std::unordered_map<uint64_t, LoadInfo>& pt_loads = elf->pt_loads();
ASSERT_EQ(1U, pt_loads.size());
LoadInfo load_data = pt_loads.at(0x1000);
ASSERT_EQ(0x1000U, load_data.offset);
ASSERT_EQ(0x2001U, load_data.table_offset);
ASSERT_EQ(0x10001U, load_data.table_size);
}
TEST_F(ElfInterfaceTest, elf32_non_executable_pt_loads) {
NonExecutablePtLoads<Elf32_Ehdr, Elf32_Phdr, Elf32_Dyn, ElfInterface32>();
}
TEST_F(ElfInterfaceTest, elf64_non_executable_pt_loads) {
NonExecutablePtLoads<Elf64_Ehdr, Elf64_Phdr, Elf64_Dyn, ElfInterface64>();
}
template <typename Ehdr, typename Phdr, typename Dyn, typename ElfInterfaceType>
void ElfInterfaceTest::ManyPhdrs() {
std::unique_ptr<ElfInterface> elf(new ElfInterfaceType(&memory_));
Ehdr ehdr;
memset(&ehdr, 0, sizeof(ehdr));
ehdr.e_phoff = 0x100;
ehdr.e_phnum = 7;
ehdr.e_phentsize = sizeof(Phdr);
memory_.SetMemory(0, &ehdr, sizeof(ehdr));
Phdr phdr;
uint64_t phdr_offset = 0x100;
memset(&phdr, 0, sizeof(phdr));
phdr.p_type = PT_LOAD;
phdr.p_vaddr = 0x2000;
phdr.p_memsz = 0x10000;
phdr.p_flags = PF_R | PF_X;
phdr.p_align = 0x1000;
memory_.SetMemory(phdr_offset, &phdr, sizeof(phdr));
phdr_offset += sizeof(phdr);
memset(&phdr, 0, sizeof(phdr));
phdr.p_type = PT_GNU_EH_FRAME;
memory_.SetMemory(phdr_offset, &phdr, sizeof(phdr));
phdr_offset += sizeof(phdr);
memset(&phdr, 0, sizeof(phdr));
phdr.p_type = PT_DYNAMIC;
memory_.SetMemory(phdr_offset, &phdr, sizeof(phdr));
phdr_offset += sizeof(phdr);
memset(&phdr, 0, sizeof(phdr));
phdr.p_type = PT_INTERP;
memory_.SetMemory(phdr_offset, &phdr, sizeof(phdr));
phdr_offset += sizeof(phdr);
memset(&phdr, 0, sizeof(phdr));
phdr.p_type = PT_NOTE;
memory_.SetMemory(phdr_offset, &phdr, sizeof(phdr));
phdr_offset += sizeof(phdr);
memset(&phdr, 0, sizeof(phdr));
phdr.p_type = PT_SHLIB;
memory_.SetMemory(phdr_offset, &phdr, sizeof(phdr));
phdr_offset += sizeof(phdr);
memset(&phdr, 0, sizeof(phdr));
phdr.p_type = PT_GNU_EH_FRAME;
memory_.SetMemory(phdr_offset, &phdr, sizeof(phdr));
phdr_offset += sizeof(phdr);
uint64_t load_bias = 0;
ASSERT_TRUE(elf->Init(&load_bias));
EXPECT_EQ(0x2000U, load_bias);
const std::unordered_map<uint64_t, LoadInfo>& pt_loads = elf->pt_loads();
ASSERT_EQ(1U, pt_loads.size());
LoadInfo load_data = pt_loads.at(0);
ASSERT_EQ(0U, load_data.offset);
ASSERT_EQ(0x2000U, load_data.table_offset);
ASSERT_EQ(0x10000U, load_data.table_size);
}
TEST_F(ElfInterfaceTest, elf32_many_phdrs) {
ElfInterfaceTest::ManyPhdrs<Elf32_Ehdr, Elf32_Phdr, Elf32_Dyn, ElfInterface32>();
}
TEST_F(ElfInterfaceTest, elf64_many_phdrs) {
ElfInterfaceTest::ManyPhdrs<Elf64_Ehdr, Elf64_Phdr, Elf64_Dyn, ElfInterface64>();
}
TEST_F(ElfInterfaceTest, elf32_arm) {
ElfInterfaceArm elf_arm(&memory_);
Elf32_Ehdr ehdr;
memset(&ehdr, 0, sizeof(ehdr));
ehdr.e_phoff = 0x100;
ehdr.e_phnum = 1;
ehdr.e_phentsize = sizeof(Elf32_Phdr);
memory_.SetMemory(0, &ehdr, sizeof(ehdr));
Elf32_Phdr phdr;
memset(&phdr, 0, sizeof(phdr));
phdr.p_type = PT_ARM_EXIDX;
phdr.p_vaddr = 0x2000;
phdr.p_memsz = 16;
memory_.SetMemory(0x100, &phdr, sizeof(phdr));
// Add arm exidx entries.
memory_.SetData32(0x2000, 0x1000);
memory_.SetData32(0x2008, 0x1000);
uint64_t load_bias = 0;
ASSERT_TRUE(elf_arm.Init(&load_bias));
EXPECT_EQ(0U, load_bias);
std::vector<uint32_t> entries;
for (auto addr : elf_arm) {
entries.push_back(addr);
}
ASSERT_EQ(2U, entries.size());
ASSERT_EQ(0x3000U, entries[0]);
ASSERT_EQ(0x3008U, entries[1]);
ASSERT_EQ(0x2000U, elf_arm.start_offset());
ASSERT_EQ(2U, elf_arm.total_entries());
}
template <typename Ehdr, typename Phdr, typename Dyn, typename ElfInterfaceType>
void ElfInterfaceTest::Soname() {
std::unique_ptr<ElfInterface> elf(new ElfInterfaceType(&memory_));
Ehdr ehdr;
memset(&ehdr, 0, sizeof(ehdr));
ehdr.e_phoff = 0x100;
ehdr.e_phnum = 1;
ehdr.e_phentsize = sizeof(Phdr);
memory_.SetMemory(0, &ehdr, sizeof(ehdr));
Phdr phdr;
memset(&phdr, 0, sizeof(phdr));
phdr.p_type = PT_DYNAMIC;
phdr.p_offset = 0x2000;
phdr.p_memsz = sizeof(Dyn) * 3;
memory_.SetMemory(0x100, &phdr, sizeof(phdr));
uint64_t offset = 0x2000;
Dyn dyn;
dyn.d_tag = DT_STRTAB;
dyn.d_un.d_ptr = 0x10000;
memory_.SetMemory(offset, &dyn, sizeof(dyn));
offset += sizeof(dyn);
dyn.d_tag = DT_STRSZ;
dyn.d_un.d_val = 0x1000;
memory_.SetMemory(offset, &dyn, sizeof(dyn));
offset += sizeof(dyn);
dyn.d_tag = DT_SONAME;
dyn.d_un.d_val = 0x10;
memory_.SetMemory(offset, &dyn, sizeof(dyn));
offset += sizeof(dyn);
dyn.d_tag = DT_NULL;
memory_.SetMemory(offset, &dyn, sizeof(dyn));
SetStringMemory(0x10010, "fake_soname.so");
uint64_t load_bias = 0;
ASSERT_TRUE(elf->Init(&load_bias));
EXPECT_EQ(0U, load_bias);
std::string name;
ASSERT_TRUE(elf->GetSoname(&name));
ASSERT_STREQ("fake_soname.so", name.c_str());
}
TEST_F(ElfInterfaceTest, elf32_soname) {
Soname<Elf32_Ehdr, Elf32_Phdr, Elf32_Dyn, ElfInterface32>();
}
TEST_F(ElfInterfaceTest, elf64_soname) {
Soname<Elf64_Ehdr, Elf64_Phdr, Elf64_Dyn, ElfInterface64>();
}
template <typename Ehdr, typename Phdr, typename Dyn, typename ElfInterfaceType>
void ElfInterfaceTest::SonameAfterDtNull() {
std::unique_ptr<ElfInterface> elf(new ElfInterfaceType(&memory_));
Ehdr ehdr;
memset(&ehdr, 0, sizeof(ehdr));
ehdr.e_phoff = 0x100;
ehdr.e_phnum = 1;
ehdr.e_phentsize = sizeof(Phdr);
memory_.SetMemory(0, &ehdr, sizeof(ehdr));
Phdr phdr;
memset(&phdr, 0, sizeof(phdr));
phdr.p_type = PT_DYNAMIC;
phdr.p_offset = 0x2000;
phdr.p_memsz = sizeof(Dyn) * 3;
memory_.SetMemory(0x100, &phdr, sizeof(phdr));
Dyn dyn;
uint64_t offset = 0x2000;
dyn.d_tag = DT_STRTAB;
dyn.d_un.d_ptr = 0x10000;
memory_.SetMemory(offset, &dyn, sizeof(dyn));
offset += sizeof(dyn);
dyn.d_tag = DT_STRSZ;
dyn.d_un.d_val = 0x1000;
memory_.SetMemory(offset, &dyn, sizeof(dyn));
offset += sizeof(dyn);
dyn.d_tag = DT_NULL;
memory_.SetMemory(offset, &dyn, sizeof(dyn));
offset += sizeof(dyn);
dyn.d_tag = DT_SONAME;
dyn.d_un.d_val = 0x10;
memory_.SetMemory(offset, &dyn, sizeof(dyn));
offset += sizeof(dyn);
SetStringMemory(0x10010, "fake_soname.so");
uint64_t load_bias = 0;
ASSERT_TRUE(elf->Init(&load_bias));
EXPECT_EQ(0U, load_bias);
std::string name;
ASSERT_FALSE(elf->GetSoname(&name));
}
TEST_F(ElfInterfaceTest, elf32_soname_after_dt_null) {
SonameAfterDtNull<Elf32_Ehdr, Elf32_Phdr, Elf32_Dyn, ElfInterface32>();
}
TEST_F(ElfInterfaceTest, elf64_soname_after_dt_null) {
SonameAfterDtNull<Elf64_Ehdr, Elf64_Phdr, Elf64_Dyn, ElfInterface64>();
}
template <typename Ehdr, typename Phdr, typename Dyn, typename ElfInterfaceType>
void ElfInterfaceTest::SonameSize() {
std::unique_ptr<ElfInterface> elf(new ElfInterfaceType(&memory_));
Ehdr ehdr;
memset(&ehdr, 0, sizeof(ehdr));
ehdr.e_phoff = 0x100;
ehdr.e_phnum = 1;
ehdr.e_phentsize = sizeof(Phdr);
memory_.SetMemory(0, &ehdr, sizeof(ehdr));
Phdr phdr;
memset(&phdr, 0, sizeof(phdr));
phdr.p_type = PT_DYNAMIC;
phdr.p_offset = 0x2000;
phdr.p_memsz = sizeof(Dyn);
memory_.SetMemory(0x100, &phdr, sizeof(phdr));
Dyn dyn;
uint64_t offset = 0x2000;
dyn.d_tag = DT_STRTAB;
dyn.d_un.d_ptr = 0x10000;
memory_.SetMemory(offset, &dyn, sizeof(dyn));
offset += sizeof(dyn);
dyn.d_tag = DT_STRSZ;
dyn.d_un.d_val = 0x10;
memory_.SetMemory(offset, &dyn, sizeof(dyn));
offset += sizeof(dyn);
dyn.d_tag = DT_SONAME;
dyn.d_un.d_val = 0x10;
memory_.SetMemory(offset, &dyn, sizeof(dyn));
offset += sizeof(dyn);
dyn.d_tag = DT_NULL;
memory_.SetMemory(offset, &dyn, sizeof(dyn));
SetStringMemory(0x10010, "fake_soname.so");
uint64_t load_bias = 0;
ASSERT_TRUE(elf->Init(&load_bias));
EXPECT_EQ(0U, load_bias);
std::string name;
ASSERT_FALSE(elf->GetSoname(&name));
}
TEST_F(ElfInterfaceTest, elf32_soname_size) {
SonameSize<Elf32_Ehdr, Elf32_Phdr, Elf32_Dyn, ElfInterface32>();
}
TEST_F(ElfInterfaceTest, elf64_soname_size) {
SonameSize<Elf64_Ehdr, Elf64_Phdr, Elf64_Dyn, ElfInterface64>();
}
template <typename ElfType>
void ElfInterfaceTest::InitHeadersEhFrameTest() {
ElfType elf(&memory_);
elf.FakeSetEhFrameOffset(0x10000);
elf.FakeSetEhFrameSize(0);
elf.FakeSetDebugFrameOffset(0);
elf.FakeSetDebugFrameSize(0);
memory_.SetMemory(0x10000,
std::vector<uint8_t>{0x1, DW_EH_PE_udata2, DW_EH_PE_udata2, DW_EH_PE_udata2});
memory_.SetData32(0x10004, 0x500);
memory_.SetData32(0x10008, 250);
elf.InitHeaders();
EXPECT_FALSE(elf.eh_frame() == nullptr);
EXPECT_TRUE(elf.debug_frame() == nullptr);
}
TEST_F(ElfInterfaceTest, init_headers_eh_frame32) {
InitHeadersEhFrameTest<ElfInterface32Fake>();
}
TEST_F(ElfInterfaceTest, init_headers_eh_frame64) {
InitHeadersEhFrameTest<ElfInterface64Fake>();
}
template <typename ElfType>
void ElfInterfaceTest::InitHeadersDebugFrame() {
ElfType elf(&memory_);
elf.FakeSetEhFrameOffset(0);
elf.FakeSetEhFrameSize(0);
elf.FakeSetDebugFrameOffset(0x5000);
elf.FakeSetDebugFrameSize(0x200);
memory_.SetData32(0x5000, 0xfc);
memory_.SetData32(0x5004, 0xffffffff);
memory_.SetData8(0x5008, 1);
memory_.SetData8(0x5009, '\0');
memory_.SetData32(0x5100, 0xfc);
memory_.SetData32(0x5104, 0);
memory_.SetData32(0x5108, 0x1500);
memory_.SetData32(0x510c, 0x200);
elf.InitHeaders();
EXPECT_TRUE(elf.eh_frame() == nullptr);
EXPECT_FALSE(elf.debug_frame() == nullptr);
}
TEST_F(ElfInterfaceTest, init_headers_debug_frame32) {
InitHeadersDebugFrame<ElfInterface32Fake>();
}
TEST_F(ElfInterfaceTest, init_headers_debug_frame64) {
InitHeadersDebugFrame<ElfInterface64Fake>();
}
template <typename ElfType>
void ElfInterfaceTest::InitHeadersEhFrameFail() {
ElfType elf(&memory_);
elf.FakeSetEhFrameOffset(0x1000);
elf.FakeSetEhFrameSize(0x100);
elf.FakeSetDebugFrameOffset(0);
elf.FakeSetDebugFrameSize(0);
elf.InitHeaders();
EXPECT_TRUE(elf.eh_frame() == nullptr);
EXPECT_EQ(0U, elf.eh_frame_offset());
EXPECT_EQ(static_cast<uint64_t>(-1), elf.eh_frame_size());
EXPECT_TRUE(elf.debug_frame() == nullptr);
}
TEST_F(ElfInterfaceTest, init_headers_eh_frame32_fail) {
InitHeadersEhFrameFail<ElfInterface32Fake>();
}
TEST_F(ElfInterfaceTest, init_headers_eh_frame64_fail) {
InitHeadersEhFrameFail<ElfInterface64Fake>();
}
template <typename ElfType>
void ElfInterfaceTest::InitHeadersDebugFrameFail() {
ElfType elf(&memory_);
elf.FakeSetEhFrameOffset(0);
elf.FakeSetEhFrameSize(0);
elf.FakeSetDebugFrameOffset(0x1000);
elf.FakeSetDebugFrameSize(0x100);
elf.InitHeaders();
EXPECT_TRUE(elf.eh_frame() == nullptr);
EXPECT_TRUE(elf.debug_frame() == nullptr);
EXPECT_EQ(0U, elf.debug_frame_offset());
EXPECT_EQ(static_cast<uint64_t>(-1), elf.debug_frame_size());
}
TEST_F(ElfInterfaceTest, init_headers_debug_frame32_fail) {
InitHeadersDebugFrameFail<ElfInterface32Fake>();
}
TEST_F(ElfInterfaceTest, init_headers_debug_frame64_fail) {
InitHeadersDebugFrameFail<ElfInterface64Fake>();
}
template <typename Ehdr, typename Shdr, typename ElfInterfaceType>
void ElfInterfaceTest::InitSectionHeadersMalformed() {
std::unique_ptr<ElfInterfaceType> elf(new ElfInterfaceType(&memory_));
Ehdr ehdr;
memset(&ehdr, 0, sizeof(ehdr));
ehdr.e_shoff = 0x1000;
ehdr.e_shnum = 10;
ehdr.e_shentsize = sizeof(Shdr);
memory_.SetMemory(0, &ehdr, sizeof(ehdr));
uint64_t load_bias = 0;
ASSERT_TRUE(elf->Init(&load_bias));
EXPECT_EQ(0U, load_bias);
}
TEST_F(ElfInterfaceTest, init_section_headers_malformed32) {
InitSectionHeadersMalformed<Elf32_Ehdr, Elf32_Shdr, ElfInterface32>();
}
TEST_F(ElfInterfaceTest, init_section_headers_malformed64) {
InitSectionHeadersMalformed<Elf64_Ehdr, Elf64_Shdr, ElfInterface64>();
}
template <typename Ehdr, typename Shdr, typename Sym, typename ElfInterfaceType>
void ElfInterfaceTest::InitSectionHeaders(uint64_t entry_size) {
std::unique_ptr<ElfInterfaceType> elf(new ElfInterfaceType(&memory_));
uint64_t offset = 0x1000;
Ehdr ehdr;
memset(&ehdr, 0, sizeof(ehdr));
ehdr.e_shoff = offset;
ehdr.e_shnum = 10;
ehdr.e_shentsize = entry_size;
memory_.SetMemory(0, &ehdr, sizeof(ehdr));
offset += ehdr.e_shentsize;
Shdr shdr;
memset(&shdr, 0, sizeof(shdr));
shdr.sh_type = SHT_SYMTAB;
shdr.sh_link = 4;
shdr.sh_addr = 0x5000;
shdr.sh_offset = 0x5000;
shdr.sh_entsize = sizeof(Sym);
shdr.sh_size = shdr.sh_entsize * 10;
memory_.SetMemory(offset, &shdr, sizeof(shdr));
offset += ehdr.e_shentsize;
memset(&shdr, 0, sizeof(shdr));
shdr.sh_type = SHT_DYNSYM;
shdr.sh_link = 4;
shdr.sh_addr = 0x6000;
shdr.sh_offset = 0x6000;
shdr.sh_entsize = sizeof(Sym);
shdr.sh_size = shdr.sh_entsize * 10;
memory_.SetMemory(offset, &shdr, sizeof(shdr));
offset += ehdr.e_shentsize;
memset(&shdr, 0, sizeof(shdr));
shdr.sh_type = SHT_PROGBITS;
shdr.sh_name = 0xa000;
memory_.SetMemory(offset, &shdr, sizeof(shdr));
offset += ehdr.e_shentsize;
// The string data for the entries.
memset(&shdr, 0, sizeof(shdr));
shdr.sh_type = SHT_STRTAB;
shdr.sh_name = 0x20000;
shdr.sh_offset = 0xf000;
shdr.sh_size = 0x1000;
memory_.SetMemory(offset, &shdr, sizeof(shdr));
offset += ehdr.e_shentsize;
InitSym<Sym>(0x5000, 0x90000, 0x1000, 0x100, 0xf000, "function_one");
InitSym<Sym>(0x6000, 0xd0000, 0x1000, 0x300, 0xf000, "function_two");
uint64_t load_bias = 0;
ASSERT_TRUE(elf->Init(&load_bias));
EXPECT_EQ(0U, load_bias);
EXPECT_EQ(0U, elf->debug_frame_offset());
EXPECT_EQ(0U, elf->debug_frame_size());
EXPECT_EQ(0U, elf->gnu_debugdata_offset());
EXPECT_EQ(0U, elf->gnu_debugdata_size());
// Look in the first symbol table.
std::string name;
uint64_t name_offset;
ASSERT_TRUE(elf->GetFunctionName(0x90010, 0, &name, &name_offset));
EXPECT_EQ("function_one", name);
EXPECT_EQ(16U, name_offset);
ASSERT_TRUE(elf->GetFunctionName(0xd0020, 0, &name, &name_offset));
EXPECT_EQ("function_two", name);
EXPECT_EQ(32U, name_offset);
}
TEST_F(ElfInterfaceTest, init_section_headers32) {
InitSectionHeaders<Elf32_Ehdr, Elf32_Shdr, Elf32_Sym, ElfInterface32>(sizeof(Elf32_Shdr));
}
TEST_F(ElfInterfaceTest, init_section_headers64) {
InitSectionHeaders<Elf64_Ehdr, Elf64_Shdr, Elf64_Sym, ElfInterface64>(sizeof(Elf64_Shdr));
}
TEST_F(ElfInterfaceTest, init_section_headers_non_std_entry_size32) {
InitSectionHeaders<Elf32_Ehdr, Elf32_Shdr, Elf32_Sym, ElfInterface32>(0x100);
}
TEST_F(ElfInterfaceTest, init_section_headers_non_std_entry_size64) {
InitSectionHeaders<Elf64_Ehdr, Elf64_Shdr, Elf64_Sym, ElfInterface64>(0x100);
}
template <typename Ehdr, typename Shdr, typename ElfInterfaceType>
void ElfInterfaceTest::InitSectionHeadersOffsets() {
std::unique_ptr<ElfInterfaceType> elf(new ElfInterfaceType(&memory_));
uint64_t offset = 0x2000;
Ehdr ehdr;
memset(&ehdr, 0, sizeof(ehdr));
ehdr.e_shoff = offset;
ehdr.e_shnum = 10;
ehdr.e_shentsize = sizeof(Shdr);
ehdr.e_shstrndx = 2;
memory_.SetMemory(0, &ehdr, sizeof(ehdr));
offset += ehdr.e_shentsize;
Shdr shdr;
memset(&shdr, 0, sizeof(shdr));
shdr.sh_type = SHT_PROGBITS;
shdr.sh_link = 2;
shdr.sh_name = 0x200;
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;
// 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;
memory_.SetMemory(offset, &shdr, sizeof(shdr));
offset += ehdr.e_shentsize;
memset(&shdr, 0, sizeof(shdr));
shdr.sh_type = SHT_PROGBITS;
shdr.sh_link = 2;
shdr.sh_name = 0x100;
shdr.sh_addr = 0x6000;
shdr.sh_offset = 0x6000;
shdr.sh_entsize = 0x100;
shdr.sh_size = 0x500;
memory_.SetMemory(offset, &shdr, sizeof(shdr));
offset += ehdr.e_shentsize;
memset(&shdr, 0, sizeof(shdr));
shdr.sh_type = SHT_PROGBITS;
shdr.sh_link = 2;
shdr.sh_name = 0x300;
shdr.sh_addr = 0x7000;
shdr.sh_offset = 0x7000;
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_PROGBITS;
shdr.sh_link = 2;
shdr.sh_name = 0x400;
shdr.sh_addr = 0x6000;
shdr.sh_offset = 0xa000;
shdr.sh_entsize = 0x100;
shdr.sh_size = 0xf00;
memory_.SetMemory(offset, &shdr, sizeof(shdr));
offset += ehdr.e_shentsize;
memory_.SetMemory(0xf100, ".debug_frame", sizeof(".debug_frame"));
memory_.SetMemory(0xf200, ".gnu_debugdata", sizeof(".gnu_debugdata"));
memory_.SetMemory(0xf300, ".eh_frame", sizeof(".eh_frame"));
memory_.SetMemory(0xf400, ".eh_frame_hdr", sizeof(".eh_frame_hdr"));
uint64_t load_bias = 0;
ASSERT_TRUE(elf->Init(&load_bias));
EXPECT_EQ(0U, load_bias);
EXPECT_EQ(0x6000U, elf->debug_frame_offset());
EXPECT_EQ(0x500U, elf->debug_frame_size());
EXPECT_EQ(0x5000U, elf->gnu_debugdata_offset());
EXPECT_EQ(0x800U, elf->gnu_debugdata_size());
EXPECT_EQ(0x7000U, elf->eh_frame_offset());
EXPECT_EQ(0x800U, elf->eh_frame_size());
EXPECT_EQ(0xa000U, elf->eh_frame_hdr_offset());
EXPECT_EQ(0xf00U, elf->eh_frame_hdr_size());
}
TEST_F(ElfInterfaceTest, init_section_headers_offsets32) {
InitSectionHeadersOffsets<Elf32_Ehdr, Elf32_Shdr, ElfInterface32>();
}
TEST_F(ElfInterfaceTest, init_section_headers_offsets64) {
InitSectionHeadersOffsets<Elf64_Ehdr, Elf64_Shdr, ElfInterface64>();
}
TEST_F(ElfInterfaceTest, is_valid_pc_from_pt_load) {
std::unique_ptr<ElfInterface> elf(new ElfInterface32(&memory_));
Elf32_Ehdr ehdr;
memset(&ehdr, 0, sizeof(ehdr));
ehdr.e_phoff = 0x100;
ehdr.e_phnum = 1;
ehdr.e_phentsize = sizeof(Elf32_Phdr);
memory_.SetMemory(0, &ehdr, sizeof(ehdr));
Elf32_Phdr phdr;
memset(&phdr, 0, sizeof(phdr));
phdr.p_type = PT_LOAD;
phdr.p_vaddr = 0;
phdr.p_memsz = 0x10000;
phdr.p_flags = PF_R | PF_X;
phdr.p_align = 0x1000;
memory_.SetMemory(0x100, &phdr, sizeof(phdr));
uint64_t load_bias = 0;
ASSERT_TRUE(elf->Init(&load_bias));
EXPECT_EQ(0U, load_bias);
EXPECT_TRUE(elf->IsValidPc(0));
EXPECT_TRUE(elf->IsValidPc(0x5000));
EXPECT_TRUE(elf->IsValidPc(0xffff));
EXPECT_FALSE(elf->IsValidPc(0x10000));
}
TEST_F(ElfInterfaceTest, is_valid_pc_from_pt_load_non_zero_load_bias) {
std::unique_ptr<ElfInterface> elf(new ElfInterface32(&memory_));
Elf32_Ehdr ehdr;
memset(&ehdr, 0, sizeof(ehdr));
ehdr.e_phoff = 0x100;
ehdr.e_phnum = 1;
ehdr.e_phentsize = sizeof(Elf32_Phdr);
memory_.SetMemory(0, &ehdr, sizeof(ehdr));
Elf32_Phdr phdr;
memset(&phdr, 0, sizeof(phdr));
phdr.p_type = PT_LOAD;
phdr.p_vaddr = 0x2000;
phdr.p_memsz = 0x10000;
phdr.p_flags = PF_R | PF_X;
phdr.p_align = 0x1000;
memory_.SetMemory(0x100, &phdr, sizeof(phdr));
uint64_t load_bias = 0;
ASSERT_TRUE(elf->Init(&load_bias));
EXPECT_EQ(0x2000U, load_bias);
EXPECT_FALSE(elf->IsValidPc(0));
EXPECT_FALSE(elf->IsValidPc(0x1000));
EXPECT_FALSE(elf->IsValidPc(0x1fff));
EXPECT_TRUE(elf->IsValidPc(0x2000));
EXPECT_TRUE(elf->IsValidPc(0x5000));
EXPECT_TRUE(elf->IsValidPc(0x11fff));
EXPECT_FALSE(elf->IsValidPc(0x12000));
}
TEST_F(ElfInterfaceTest, is_valid_pc_from_debug_frame) {
std::unique_ptr<ElfInterface> elf(new ElfInterface32(&memory_));
uint64_t sh_offset = 0x100;
Elf32_Ehdr ehdr;
memset(&ehdr, 0, sizeof(ehdr));
ehdr.e_shstrndx = 1;
ehdr.e_shoff = sh_offset;
ehdr.e_shentsize = sizeof(Elf32_Shdr);
ehdr.e_shnum = 3;
memory_.SetMemory(0, &ehdr, sizeof(ehdr));
Elf32_Shdr shdr;
memset(&shdr, 0, sizeof(shdr));
shdr.sh_type = SHT_NULL;
memory_.SetMemory(sh_offset, &shdr, sizeof(shdr));
sh_offset += sizeof(shdr);
memset(&shdr, 0, sizeof(shdr));
shdr.sh_type = SHT_STRTAB;
shdr.sh_name = 1;
shdr.sh_offset = 0x500;
shdr.sh_size = 0x100;
memory_.SetMemory(sh_offset, &shdr, sizeof(shdr));
memory_.SetMemory(0x500, ".debug_frame");
sh_offset += sizeof(shdr);
memset(&shdr, 0, sizeof(shdr));
shdr.sh_type = SHT_PROGBITS;
shdr.sh_name = 0;
shdr.sh_addr = 0x600;
shdr.sh_offset = 0x600;
shdr.sh_size = 0x200;
memory_.SetMemory(sh_offset, &shdr, sizeof(shdr));
// CIE 32.
memory_.SetData32(0x600, 0xfc);
memory_.SetData32(0x604, 0xffffffff);
memory_.SetData8(0x608, 1);
memory_.SetData8(0x609, '\0');
memory_.SetData8(0x60a, 0x4);
memory_.SetData8(0x60b, 0x4);
memory_.SetData8(0x60c, 0x1);
// FDE 32.
memory_.SetData32(0x700, 0xfc);
memory_.SetData32(0x704, 0);
memory_.SetData32(0x708, 0x2100);
memory_.SetData32(0x70c, 0x200);
uint64_t load_bias = 0;
ASSERT_TRUE(elf->Init(&load_bias));
elf->InitHeaders();
EXPECT_EQ(0U, load_bias);
EXPECT_FALSE(elf->IsValidPc(0));
EXPECT_FALSE(elf->IsValidPc(0x20ff));
EXPECT_TRUE(elf->IsValidPc(0x2100));
EXPECT_TRUE(elf->IsValidPc(0x2200));
EXPECT_TRUE(elf->IsValidPc(0x22ff));
EXPECT_FALSE(elf->IsValidPc(0x2300));
}
TEST_F(ElfInterfaceTest, is_valid_pc_from_eh_frame) {
std::unique_ptr<ElfInterface> elf(new ElfInterface32(&memory_));
uint64_t sh_offset = 0x100;
Elf32_Ehdr ehdr;
memset(&ehdr, 0, sizeof(ehdr));
ehdr.e_shstrndx = 1;
ehdr.e_shoff = sh_offset;
ehdr.e_shentsize = sizeof(Elf32_Shdr);
ehdr.e_shnum = 3;
memory_.SetMemory(0, &ehdr, sizeof(ehdr));
Elf32_Shdr shdr;
memset(&shdr, 0, sizeof(shdr));
shdr.sh_type = SHT_NULL;
memory_.SetMemory(sh_offset, &shdr, sizeof(shdr));
sh_offset += sizeof(shdr);
memset(&shdr, 0, sizeof(shdr));
shdr.sh_type = SHT_STRTAB;
shdr.sh_name = 1;
shdr.sh_offset = 0x500;
shdr.sh_size = 0x100;
memory_.SetMemory(sh_offset, &shdr, sizeof(shdr));
memory_.SetMemory(0x500, ".eh_frame");
sh_offset += sizeof(shdr);
memset(&shdr, 0, sizeof(shdr));
shdr.sh_type = SHT_PROGBITS;
shdr.sh_name = 0;
shdr.sh_addr = 0x600;
shdr.sh_offset = 0x600;
shdr.sh_size = 0x200;
memory_.SetMemory(sh_offset, &shdr, sizeof(shdr));
// CIE 32.
memory_.SetData32(0x600, 0xfc);
memory_.SetData32(0x604, 0);
memory_.SetData8(0x608, 1);
memory_.SetData8(0x609, '\0');
memory_.SetData8(0x60a, 0x4);
memory_.SetData8(0x60b, 0x4);
memory_.SetData8(0x60c, 0x1);
// FDE 32.
memory_.SetData32(0x700, 0xfc);
memory_.SetData32(0x704, 0x104);
memory_.SetData32(0x708, 0x20f8);
memory_.SetData32(0x70c, 0x200);
uint64_t load_bias = 0;
ASSERT_TRUE(elf->Init(&load_bias));
elf->InitHeaders();
EXPECT_EQ(0U, load_bias);
EXPECT_FALSE(elf->IsValidPc(0));
EXPECT_FALSE(elf->IsValidPc(0x27ff));
EXPECT_TRUE(elf->IsValidPc(0x2800));
EXPECT_TRUE(elf->IsValidPc(0x2900));
EXPECT_TRUE(elf->IsValidPc(0x29ff));
EXPECT_FALSE(elf->IsValidPc(0x2a00));
}
} // namespace unwindstack
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