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/*
Copyright (C) 2006 - 2015 Evan Teran
evan.teran@gmail.com
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "ELFXX.h"
#include "IDebugger.h"
#include "IProcess.h"
#include "IRegion.h"
#include "MemoryRegions.h"
#include "Util.h"
#include "edb.h"
#include "libELF/elf_phdr.h"
#include "string_hash.h"
#include <QDebug>
#include <QFile>
#include <QVector>
#include <cstdint>
#include <cstring>
namespace BinaryInfoPlugin {
class ELFBinaryException : public std::exception {
const char *what() const noexcept override = 0;
};
class InvalidArguments : public ELFBinaryException {
public:
const char *what() const noexcept override {
return "Invalid Arguments";
}
};
class ReadFailure : public ELFBinaryException {
public:
const char *what() const noexcept override {
return "Read Failure";
}
};
class InvalidELF : public ELFBinaryException {
public:
const char *what() const noexcept override {
return "Invalid ELF";
}
};
class InvalidArchitecture : public ELFBinaryException {
public:
const char *what() const noexcept override {
return "Invalid Architecture";
}
};
template <class ElfHeader>
ELFXX<ElfHeader>::ELFXX(const std::shared_ptr<IRegion> ®ion)
: region_(region) {
using phdr_type = typename ElfHeader::elf_phdr;
if (!region_) {
throw InvalidArguments();
}
IProcess *const process = edb::v1::debugger_core->process();
if (!process) {
throw ReadFailure();
}
if (!process->readBytes(region_->start(), &header_, sizeof(ElfHeader))) {
throw ReadFailure();
}
validateHeader();
headers_.push_back({region_->start(), header_.e_ehsize});
headers_.push_back({region_->start() + header_.e_phoff, static_cast<size_t>(header_.e_phentsize * header_.e_phnum)});
auto phdr_size = header_.e_phentsize;
if (phdr_size < sizeof(phdr_type)) {
qDebug() << QString::number(region_->start(), 16) << "program header size less than expected";
baseAddress_ = region_->start();
return;
}
phdr_type phdr;
auto phdr_base = region_->start() + header_.e_phoff;
edb::address_t lowest = ULLONG_MAX;
if (header_.e_type == ET_EXEC) {
// iterate all of the program headers
for (uint16_t entry = 0; entry < header_.e_phnum; ++entry) {
if (!process->readBytes(phdr_base + (phdr_size * entry), &phdr, sizeof(phdr_type))) {
qDebug() << "Failed to read program header";
break;
}
if (phdr.p_type == PT_LOAD && phdr.p_vaddr < lowest) {
lowest = phdr.p_vaddr;
// NOTE(eteran): they are defined to be in ascending order of vaddr
break;
}
}
} else if (header_.e_type == ET_DYN) {
const QString process_executable = edb::v1::debugger_core->process()->name();
for (const std::shared_ptr<IRegion> &r : edb::v1::memory_regions().regions()) {
if (r->executable() && r->name() == region->name()) {
lowest = std::min(lowest, r->start());
}
}
}
if (lowest == ULLONG_MAX) {
qDebug() << "binary base address not found. Assuming " << QString::number(region_->start(), 16);
baseAddress_ = region->start();
} else {
baseAddress_ = lowest;
}
}
template <class ElfHeader>
/**
* @brief ELFXX<ElfHeader>::headerSize
* @return the number of bytes in this executable's header
*/
size_t ELFXX<ElfHeader>::headerSize() const {
size_t size = header_.e_ehsize;
// Do the program headers immediately follow the ELF header?
if (size == header_.e_phoff) {
size += header_.e_phentsize * header_.e_phnum;
}
return size;
}
/**
* @brief ELFXX<ElfHeader>::headers
* @return a list of all headers in this binary
*/
template <class ElfHeader>
std::vector<IBinary::Header> ELFXX<ElfHeader>::headers() const {
return headers_;
}
/**
* @brief ELFXX<ElfHeader>::validateHeader
*
* ensures that the header that we read was valid
*/
template <class ElfHeader>
void ELFXX<ElfHeader>::validateHeader() {
if (std::memcmp(header_.e_ident, ELFMAG, SELFMAG) != 0) {
throw InvalidELF();
}
if (header_.e_ident[EI_CLASS] != ElfHeader::ELFCLASS) {
throw InvalidArchitecture();
}
}
/**
* @brief ELFXX<ElfHeader>::entryPoint
* @return the entry point if any of the binary
*/
template <class ElfHeader>
edb::address_t ELFXX<ElfHeader>::entryPoint() {
return header_.e_entry + baseAddress_;
}
/**
* @brief ELFXX<ElfHeader>::header
* @return a copy of the file header or nullptr if the region wasn't a valid,
* known binary type
*/
template <class ElfHeader>
const void *ELFXX<ElfHeader>::header() const {
return &header_;
}
// explicit instantiations
template class ELFXX<elf32_header>;
template class ELFXX<elf64_header>;
}
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