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// Copyright 2021 Google Inc. All Rights Reserved.
//
// 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 "absl/strings/substitute.h"
#include "bloaty.h"
#include "util.h"
using std::string_view;
using std::string;
namespace bloaty {
namespace pe {
constexpr uint16_t dos_magic = 0x5A4D; // MZ
// From LIEF/include/LIEF/PE/Structures.hpp.in
//! Sizes in bytes of various things in the COFF format.
[[maybe_unused]] constexpr size_t kHeader16Size = 20;
[[maybe_unused]] constexpr size_t kHeader32Size = 56;
constexpr size_t kNameSize = 8;
constexpr size_t kSymbol16Size = 18;
[[maybe_unused]] constexpr size_t kSymbol32Size = 20;
constexpr size_t kSectionSize = 40;
constexpr size_t kRelocationSize = 10;
constexpr size_t kBaseRelocationBlockSize = 8;
constexpr size_t kImportDirectoryTableEntrySize = 20;
constexpr size_t kResourceDirectoryTableSize = 16;
constexpr size_t kResourceDirectoryEntriesSize = 8;
constexpr size_t kResourceDataEntrySize = 16;
#include "third_party/lief_pe/pe_enums.h"
#include "third_party/lief_pe/pe_structures.h"
static_assert(kSectionSize == sizeof(pe_section),
"Compiler options broke LIEF struct layout");
static_assert(kRelocationSize == sizeof(pe_relocation),
"Compiler options broke LIEF struct layout");
static_assert(kBaseRelocationBlockSize == sizeof(pe_base_relocation_block),
"Compiler options broke LIEF struct layout");
static_assert(kImportDirectoryTableEntrySize == sizeof(pe_import),
"Compiler options broke LIEF struct layout");
static_assert(kResourceDirectoryTableSize ==
sizeof(pe_resource_directory_table),
"Compiler options broke LIEF struct layout");
static_assert(kResourceDirectoryEntriesSize ==
sizeof(pe_resource_directory_entries),
"Compiler options broke LIEF struct layout");
static_assert(kResourceDataEntrySize == sizeof(pe_resource_data_entry),
"Compiler options broke LIEF struct layout");
static_assert(kSymbol16Size == sizeof(pe_symbol),
"Compiler options broke LIEF struct layout");
static_assert(sizeof(PE_TYPE) == sizeof(uint16_t),
"Compiler options broke PE_TYPE size");
class PeFile {
public:
PeFile(string_view data) : data_(data) { ok_ = Initialize(); }
bool IsOpen() const { return ok_; }
string_view entire_file() const { return data_; }
string_view pe_headers() const { return pe_headers_; }
string_view section_headers() const { return section_headers_; }
uint32_t section_count() const { return section_count_; }
string_view section_header(size_t n) const {
return StrictSubstr(section_headers_, n * sizeof(pe_section),
sizeof(pe_section));
}
private:
bool Initialize();
string_view GetRegion(uint64_t start, uint64_t n) const {
return StrictSubstr(data_, start, n);
}
bool ok_;
bool is_64bit_;
const string_view data_;
pe_dos_header dos_header_;
pe_header pe_header_;
string_view pe_headers_;
string_view section_headers_;
uint32_t section_count_;
};
bool PeFile::Initialize() {
if (data_.size() < sizeof(dos_header_)) {
return false;
}
memcpy(&dos_header_, data_.data(), sizeof(dos_header_));
if (dos_header_.Magic != dos_magic) {
// Not a PE file.
return false;
}
PE_TYPE Magic;
auto pe_end =
CheckedAdd(dos_header_.AddressOfNewExeHeader, sizeof(pe_header_));
if (CheckedAdd(pe_end, sizeof(Magic)) > data_.size()) {
// Cannot fit the headers / magic from optional header
return false;
}
memcpy(&pe_header_, data_.data() + dos_header_.AddressOfNewExeHeader,
sizeof(pe_header_));
if (!std::equal(pe_header_.signature, pe_header_.signature + sizeof(PE_Magic),
std::begin(PE_Magic))) {
// Not a PE file.
return false;
}
memcpy(&Magic, data_.data() + pe_end, sizeof(Magic));
if (Magic != PE_TYPE::PE32 && Magic != PE_TYPE::PE32_PLUS) {
// Unknown PE magic
return false;
}
is_64bit_ = Magic == PE_TYPE::PE32_PLUS;
section_count_ = pe_header_.NumberOfSections;
// TODO(mj): Figure out if we should trust SizeOfOptionalHeader here
const uint32_t sections_offset = dos_header_.AddressOfNewExeHeader +
sizeof(pe_header_) +
pe_header_.SizeOfOptionalHeader;
auto sections_size = CheckedMul(section_count_, sizeof(pe_section));
if ((sections_offset + sections_size) > data_.size()) {
// Cannot fit the headers
return false;
}
pe_headers_ = GetRegion(0, sections_offset);
section_headers_ = GetRegion(sections_offset, sections_size);
return true;
}
class Section {
public:
string name;
uint32_t raw_offset() const { return header_.PointerToRawData; }
uint32_t raw_size() const { return header_.SizeOfRawData; }
uint32_t virtual_addr() const { return header_.VirtualAddress; }
uint32_t virtual_size() const { return header_.VirtualSize; }
Section(string_view header_data) {
assert(header_data.size() == sizeof(header_));
memcpy(&header_, header_data.data(), sizeof(header_));
// TODO(mj): Handle long section names:
// For longer names, this member contains a forward slash (/) followed by an
// ASCII representation of a decimal number that is an offset into the
// string table.
name = string(header_.Name, strnlen(header_.Name, kNameSize));
}
private:
pe_section header_;
};
template <class Func>
void ForEachSection(const PeFile& pe, Func&& section_func) {
for (auto n = 0; n < pe.section_count(); ++n) {
Section section(pe.section_header(n));
section_func(section);
}
}
void ParseSections(const PeFile& pe, RangeSink* sink) {
assert(pe.IsOpen());
ForEachSection(pe, [sink, &pe](const Section& section) {
uint64_t vmaddr = section.virtual_addr();
uint64_t vmsize = section.virtual_size();
std::string_view section_data = StrictSubstr(
pe.entire_file(), section.raw_offset(), section.raw_size());
sink->AddRange("pe_sections", section.name, vmaddr, vmsize, section_data);
});
}
void AddCatchAll(const PeFile& pe, RangeSink* sink) {
assert(pe.IsOpen());
auto begin = pe.pe_headers().data() - sink->input_file().data().data();
sink->AddRange("pe_catchall", "[PE Headers]", begin, pe.pe_headers().size(),
pe.pe_headers());
begin = pe.section_headers().data() - sink->input_file().data().data();
sink->AddRange("pe_catchall", "[PE Section Headers]", begin,
pe.section_headers().size(), pe.section_headers());
// The last-line fallback to make sure we cover the entire file.
sink->AddFileRange("pe_catchall", "[Unmapped]", sink->input_file().data());
}
class PEObjectFile : public ObjectFile {
public:
PEObjectFile(std::unique_ptr<InputFile> file_data,
std::unique_ptr<pe::PeFile> pe)
: ObjectFile(std::move(file_data)), pe_file(std::move(pe)) {}
std::string GetBuildId() const override {
// TODO(mj): Read from pe_pdb_??
return std::string();
}
void ProcessFile(const std::vector<RangeSink*>& sinks) const override {
for (auto sink : sinks) {
switch (sink->data_source()) {
case DataSource::kSegments:
// TODO(mj): sections: list out imports and other stuff!
case DataSource::kSections:
ParseSections(*pe_file, sink);
break;
case DataSource::kSymbols:
case DataSource::kRawSymbols:
case DataSource::kShortSymbols:
case DataSource::kFullSymbols:
// TODO(mj): Generate symbols from debug info, exports, imports, tls
// data, relocations, resources ...
case DataSource::kArchiveMembers:
case DataSource::kCompileUnits:
case DataSource::kInlines:
default:
THROW("PE doesn't support this data source");
}
AddCatchAll(*pe_file, sink);
}
}
bool GetDisassemblyInfo(string_view /*symbol*/, DataSource /*symbol_source*/,
DisassemblyInfo* /*info*/) const override {
WARN("PE files do not support disassembly yet");
return false;
}
protected:
std::unique_ptr<pe::PeFile> pe_file;
};
bool ReadMagic(const string_view& data) {
// If the size is smaller than a dos header, it cannot be a PE file, right?
if (data.size() < sizeof(pe_dos_header)) {
return false;
}
uint16_t magic;
memcpy(&magic, data.data(), sizeof(magic));
return magic == dos_magic;
}
} // namespace pe
std::unique_ptr<ObjectFile> TryOpenPEFile(std::unique_ptr<InputFile>& file) {
// Do not bother creating an object if the first magic is not even there
if (pe::ReadMagic(file->data())) {
std::unique_ptr<pe::PeFile> pe(new pe::PeFile(file->data()));
if (pe->IsOpen()) {
return std::unique_ptr<ObjectFile>(
new pe::PEObjectFile(std::move(file), std::move(pe)));
}
}
return nullptr;
}
} // namespace bloaty