Commit 1e31ae20 authored by hjk's avatar hjk Committed by hjk

utils: add a simple elfreader to extract section names

Change-Id: Ia761b8d2150ff2c47a2e26c403a2b00127023d8b
Reviewed-by: default avatarhjk <qthjk@ovi.com>
parent ca7ac8c0
/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "elfreader.h"
#include "qtcassert.h"
#include <QFile>
#include <QLibrary>
#include <QDebug>
namespace Utils {
template <typename T>
T read(const char *s, ElfReader::ElfEndian endian)
{
if (endian == ElfReader::ElfBigEndian)
return qFromBigEndian<T>(reinterpret_cast<const uchar *>(s));
else
return qFromLittleEndian<T>(reinterpret_cast<const uchar *>(s));
}
ElfReader::ElfReader(const QString &binary)
: m_binary(binary)
{
}
const char *ElfReader::parseSectionHeader(const char *data, ElfSectionHeader *sh)
{
sh->name = read<qelfword_t>(data, m_endian);
data += sizeof(qelfword_t); // sh_name
sh->type = read<qelfword_t>(data, m_endian);
data += sizeof(qelfword_t) // sh_type
+ sizeof(qelfaddr_t) // sh_flags
+ sizeof(qelfaddr_t); // sh_addr
sh->offset = read<qelfoff_t>(data, m_endian);
data += sizeof(qelfoff_t); // sh_offset
sh->size = read<qelfoff_t>(data, m_endian);
data += sizeof(qelfoff_t); // sh_size
return data;
}
ElfReader::Result ElfReader::parse(const char *dataStart, quint64 fdlen,
QList<QByteArray> *sectionNames)
{
if (fdlen < 64) {
m_errorString = QLibrary::tr("'%1' is not an ELF object (%2)")
.arg(m_binary).arg(QLatin1String("file too small"));
return NotElf;
}
const char *data = dataStart;
if (strncmp(data, "\177ELF", 4) != 0) {
m_errorString = QLibrary::tr("'%1' is not an ELF object")
.arg(m_binary);
return NotElf;
}
// 32 or 64 bit
if (data[4] != 1 && data[4] != 2) {
m_errorString = QLibrary::tr("'%1' is an invalid ELF object (%2)")
.arg(m_binary).arg(QLatin1String("odd cpu architecture"));
return Corrupt;
}
// int bits = (data[4] << 5);
// If you remove this check to read ELF objects of a different arch,
// please make sure you modify the typedefs
// to match the _plugin_ architecture.
// if ((sizeof(void*) == 4 && bits != 32)
// || (sizeof(void*) == 8 && bits != 64)) {
// if (errorString)
// *errorString = QLibrary::tr("'%1' is an invalid ELF object (%2)")
// .arg(m_binary).arg(QLatin1String("wrong cpu architecture"));
// return Corrupt;
// }
// Read Endianess.
if (data[5] == 0) {
m_errorString = QLibrary::tr("'%1' is an invalid ELF object (%2)")
.arg(m_binary).arg(QLatin1String("odd endianess"));
return Corrupt;
}
m_endian = (data[5] == 1 ? ElfLittleEndian : ElfBigEndian);
data += 16 // e_ident
+ sizeof(qelfhalf_t) // e_type
+ sizeof(qelfhalf_t) // e_machine
+ sizeof(qelfword_t) // e_version
+ sizeof(qelfaddr_t) // e_entry
+ sizeof(qelfoff_t); // e_phoff
qelfoff_t e_shoff = read<qelfoff_t>(data, m_endian);
data += sizeof(qelfoff_t) // e_shoff
+ sizeof(qelfword_t); // e_flags
qelfhalf_t e_shsize = read<qelfhalf_t>(data, m_endian);
if (e_shsize > fdlen) {
m_errorString = QLibrary::tr("'%1' is an invalid ELF object (%2)")
.arg(m_binary).arg(QLatin1String("unexpected e_shsize"));
return Corrupt;
}
data += sizeof(qelfhalf_t) // e_ehsize
+ sizeof(qelfhalf_t) // e_phentsize
+ sizeof(qelfhalf_t); // e_phnum
qelfhalf_t e_shentsize = read<qelfhalf_t>(data, m_endian);
if (e_shentsize % 4) {
m_errorString = QLibrary::tr("'%1' is an invalid ELF object (%2)")
.arg(m_binary).arg(QLatin1String("unexpected e_shentsize"));
return Corrupt;
}
data += sizeof(qelfhalf_t); // e_shentsize
qelfhalf_t e_shnum = read<qelfhalf_t>(data, m_endian);
data += sizeof(qelfhalf_t); // e_shnum
qelfhalf_t e_shtrndx = read<qelfhalf_t>(data, m_endian);
data += sizeof(qelfhalf_t); // e_shtrndx
if (quint32(e_shnum * e_shentsize) > fdlen) {
m_errorString = QLibrary::tr("'%1' is an invalid ELF object (%2)")
.arg(m_binary)
.arg(QLatin1String("announced %2 sections, each %3 bytes, exceed file size"))
.arg(e_shnum).arg(e_shentsize);
return Corrupt;
}
ElfSectionHeader strtab;
qulonglong soff = e_shoff + e_shentsize * (e_shtrndx);
if ((soff + e_shentsize) > fdlen || soff % 4 || soff == 0) {
m_errorString = QLibrary::tr("'%1' is an invalid ELF object (%2)")
.arg(m_binary)
.arg(QLatin1String("shstrtab section header seems to be at %1"))
.arg(QString::number(soff, 16));
return Corrupt;
}
parseSectionHeader(dataStart + soff, &strtab);
const int stringTableFileOffset = strtab.offset;
if (quint32(stringTableFileOffset + e_shentsize) >= fdlen
|| stringTableFileOffset == 0) {
m_errorString = QLibrary::tr("'%1' is an invalid ELF object (%2)")
.arg(m_binary)
.arg(QLatin1String("string table seems to be at %1"))
.arg(QString::number(soff, 16));
return Corrupt;
}
const char *s = dataStart + e_shoff;
for (int i = 0; i < e_shnum; ++i) {
ElfSectionHeader sh;
parseSectionHeader(s, &sh);
if (sh.name == 0) {
s += e_shentsize;
continue;
}
const char *shnam = dataStart + stringTableFileOffset + sh.name;
if (stringTableFileOffset + sh.name > fdlen) {
m_errorString = QLibrary::tr("'%1' is an invalid ELF object (%2)")
.arg(m_binary)
.arg(QLatin1String("section name %2 of %3 behind end of file"))
.arg(i).arg(e_shnum);
return Corrupt;
}
if (sectionNames)
sectionNames->append(shnam);
s += e_shentsize;
}
return Ok;
}
QList<QByteArray> ElfReader::sectionNames()
{
QList<QByteArray> names;
QFile file(m_binary);
if (!file.open(QIODevice::ReadOnly)) {
m_errorString = file.errorString();
return names;
}
QByteArray data;
const char *filedata = 0;
quint64 fdlen = file.size();
filedata = (char *) file.map(0, fdlen);
if (filedata == 0) {
// Try reading the data into memory instead.
data = file.readAll();
filedata = data.constData();
fdlen = data.size();
}
parse(filedata, fdlen, &names);
return names;
}
} // namespace Utils
/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
// This is essentially copied from Qt 5's
// qtbase/src/corelib/plugin/qelfparser_p.{h,cpp}
#ifndef UTILS_ELFREADER_H
#define UTILS_ELFREADER_H
#include "utils_global.h"
#include <qendian.h>
#include <qstring.h>
namespace Utils {
typedef quint16 qelfhalf_t;
typedef quint32 qelfword_t;
typedef quintptr qelfoff_t;
typedef quintptr qelfaddr_t;
class QTCREATOR_UTILS_EXPORT ElfReader
{
public:
explicit ElfReader(const QString &binary);
struct ElfSectionHeader
{
qelfword_t name;
qelfword_t type;
qelfoff_t offset;
qelfoff_t size;
};
enum ElfEndian { ElfLittleEndian = 0, ElfBigEndian = 1 };
QList<QByteArray> sectionNames();
QString errorString() const { return m_errorString; }
private:
enum Result { Ok, NotElf, Corrupt };
const char *parseSectionHeader(const char *s, ElfSectionHeader *sh);
Result parse(const char *dataStart, quint64 fdlen, QList<QByteArray> *sectionNames);
QString m_binary;
QString m_errorString;
ElfEndian m_endian;
};
} // namespace Utils
#endif // UTILS_ELFREADER_H
......@@ -77,7 +77,8 @@ SOURCES += $$PWD/environment.cpp \
$$PWD/tcpportsgatherer.cpp \
$$PWD/appmainwindow.cpp \
$$PWD/basetreeview.cpp \
$$PWD/qtcassert.cpp
$$PWD/qtcassert.cpp \
$$PWD/elfreader.cpp
win32 {
SOURCES += \
......@@ -161,7 +162,8 @@ HEADERS += \
$$PWD/portlist.h \
$$PWD/tcpportsgatherer.h \
$$PWD/appmainwindow.h \
$$PWD/basetreeview.h
$$PWD/basetreeview.h \
$$PWD/elfreader.h
FORMS += $$PWD/filewizardpage.ui \
$$PWD/projectintropage.ui \
......
......@@ -51,6 +51,8 @@ QtcLibrary {
"detailsbutton.h",
"detailswidget.cpp",
"detailswidget.h",
"elfreader.cpp",
"elfreader.h",
"environment.h",
"environmentmodel.cpp",
"environmentmodel.h",
......
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