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/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, 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, Digia gives you certain additional
** rights. These rights are described in the Digia 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.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qelfparser_p.h"
#ifndef QT_NO_LIBRARY
#if defined (Q_OF_ELF) && defined(Q_CC_GNU)
#include "qlibrary_p.h"
#include <qdebug.h>
QT_BEGIN_NAMESPACE
// #define QELFPARSER_DEBUG 1
const char *QElfParser::parseSectionHeader(const char *data, ElfSectionHeader *sh)
{
sh->name = read<qelfword_t>(data);
data += sizeof(qelfword_t); // sh_name
sh->type = read<qelfword_t>(data);
data += sizeof(qelfword_t) // sh_type
+ sizeof(qelfaddr_t) // sh_flags
+ sizeof(qelfaddr_t); // sh_addr
sh->offset = read<qelfoff_t>(data);
data += sizeof(qelfoff_t); // sh_offset
sh->size = read<qelfoff_t>(data);
data += sizeof(qelfoff_t); // sh_size
return data;
}
int QElfParser::parse(const char *dataStart, ulong fdlen, const QString &library, QLibraryPrivate *lib, long *pos, ulong *sectionlen)
{
#if defined(QELFPARSER_DEBUG)
qDebug() << "QElfParser::parse " << library;
#endif
if (fdlen < 64){
if (lib)
lib->errorString = QLibrary::tr("'%1' is not an ELF object (%2)").arg(library).arg(QLatin1String("file too small"));
return NotElf;
}
const char *data = dataStart;
if (qstrncmp(data, "\177ELF", 4) != 0) {
if (lib)
lib->errorString = QLibrary::tr("'%1' is not an ELF object").arg(library);
return NotElf;
}
// 32 or 64 bit
if (data[4] != 1 && data[4] != 2) {
if (lib)
lib->errorString = QLibrary::tr("'%1' is an invalid ELF object (%2)").arg(library).arg(QLatin1String("odd cpu architecture"));
return Corrupt;
}
m_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 && m_bits != 32) || (sizeof(void*) == 8 && m_bits != 64)) {
if (lib)
lib->errorString = QLibrary::tr("'%1' is an invalid ELF object (%2)").arg(library).arg(QLatin1String("wrong cpu architecture"));
return Corrupt;
}
// endian
if (data[5] == 0) {
if (lib)
lib->errorString = QLibrary::tr("'%1' is an invalid ELF object (%2)").arg(library).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);
data += sizeof(qelfoff_t) // e_shoff
+ sizeof(qelfword_t); // e_flags
qelfhalf_t e_shsize = read<qelfhalf_t> (data);
if (e_shsize > fdlen) {
if (lib)
lib->errorString = QLibrary::tr("'%1' is an invalid ELF object (%2)").arg(library).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);
if (e_shentsize % 4){
if (lib)
lib->errorString = QLibrary::tr("'%1' is an invalid ELF object (%2)").arg(library).arg(QLatin1String("unexpected e_shentsize"));
return Corrupt;
}
data += sizeof(qelfhalf_t); // e_shentsize
qelfhalf_t e_shnum = read<qelfhalf_t> (data);
data += sizeof(qelfhalf_t); // e_shnum
qelfhalf_t e_shtrndx = read<qelfhalf_t> (data);
data += sizeof(qelfhalf_t); // e_shtrndx
if ((quint32)(e_shnum * e_shentsize) > fdlen) {
if (lib)
lib->errorString = QLibrary::tr("'%1' is an invalid ELF object (%2)").arg(library)
.arg(QLatin1String("announced %2 sections, each %3 bytes, exceed file size"))
.arg(e_shnum).arg(e_shentsize);
return Corrupt;
}
#if defined(QELFPARSER_DEBUG)
qDebug() << e_shnum << "sections starting at " << ("0x" + QByteArray::number(e_shoff, 16)).data() << "each" << e_shentsize << "bytes";
#endif
ElfSectionHeader strtab;
qulonglong soff = e_shoff + e_shentsize * (e_shtrndx);
if ((soff + e_shentsize) > fdlen || soff % 4 || soff == 0) {
if (lib)
lib->errorString = QLibrary::tr("'%1' is an invalid ELF object (%2)").arg(library)
.arg(QLatin1String("shstrtab section header seems to be at %1"))
.arg(QString::number(soff, 16));
return Corrupt;
}
parseSectionHeader(dataStart + soff, &strtab);
m_stringTableFileOffset = strtab.offset;
if ((quint32)(m_stringTableFileOffset + e_shentsize) >= fdlen || m_stringTableFileOffset == 0) {
if (lib)
lib->errorString = QLibrary::tr("'%1' is an invalid ELF object (%2)").arg(library)
.arg(QLatin1String("string table seems to be at %1"))
.arg(QString::number(soff, 16));
return Corrupt;
}
#if defined(QELFPARSER_DEBUG)
qDebug(".shstrtab at 0x%s", QByteArray::number(m_stringTableFileOffset, 16).data());
#endif
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 + m_stringTableFileOffset + sh.name;
if (m_stringTableFileOffset + sh.name > fdlen) {
if (lib)
lib->errorString = QLibrary::tr("'%1' is an invalid ELF object (%2)").arg(library)
.arg(QLatin1String("section name %2 of %3 behind end of file"))
.arg(i).arg(e_shnum);
return Corrupt;
}
#if defined(QELFPARSER_DEBUG)
qDebug() << "++++" << i << shnam;
#endif
if (qstrcmp(shnam, ".qtplugin") == 0 || qstrcmp(shnam, ".rodata") == 0) {
if (!(sh.type & 0x1)) {
if (shnam[1] == 'r') {
if (lib)
lib->errorString = QLibrary::tr("'%1' is an invalid ELF object (%2)").arg(library)
.arg(QLatin1String("empty .rodata. not a library."));
return Corrupt;
}
#if defined(QELFPARSER_DEBUG)
qDebug()<<"section is not program data. skipped.";
#endif
s += e_shentsize;
continue;
}
if (sh.offset == 0 || (sh.offset + sh.size) > fdlen) {
if (lib)
lib->errorString = QLibrary::tr("'%1' is an invalid ELF object (%2)").arg(library)
.arg(QLatin1String("missing section data. This is not a library."));
return Corrupt;
}
*pos = sh.offset;
*sectionlen = sh.size - 1;
if (shnam[1] == 'q')
return Ok;
}
s += e_shentsize;
}
return NoQtSection;
}
QT_END_NAMESPACE
#endif // defined(Q_OF_ELF) && defined(Q_CC_GNU)
#endif // QT_NO_LIBRARY
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