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qt6-bb10/src/corelib/plugin/qelfparser_p.cpp

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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** 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 The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/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 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qelfparser_p.h"
#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 = qFromUnaligned<qelfword_t>(data);
data += sizeof(qelfword_t); // sh_name
sh->type = qFromUnaligned<qelfword_t>(data);
data += sizeof(qelfword_t) // sh_type
+ sizeof(qelfaddr_t) // sh_flags
+ sizeof(qelfaddr_t); // sh_addr
sh->offset = qFromUnaligned<qelfoff_t>(data);
data += sizeof(qelfoff_t); // sh_offset
sh->size = qFromUnaligned<qelfoff_t>(data);
data += sizeof(qelfoff_t); // sh_size
return data;
}
QLibraryScanResult QElfParser::parse(const char *dataStart, ulong fdlen, QString *errMsg)
{
#if defined(QELFPARSER_DEBUG)
qDebug() << "QElfParser::parse " << library;
#endif
if (fdlen < 64) {
*errMsg = QLibrary::tr("'%1' is not an ELF object (%2)").arg(*errMsg, QLibrary::tr("file too small"));
return {};
}
const char *data = dataStart;
if (qstrncmp(data, "\177ELF", 4) != 0) {
*errMsg = QLibrary::tr("'%1' is not an ELF object").arg(*errMsg);
return {};
}
// 32 or 64 bit
if (data[4] != 1 && data[4] != 2) {
*errMsg = QLibrary::tr("'%1' is an invalid ELF object (%2)").arg(*errMsg, QLibrary::tr("odd cpu architecture"));
return {};
}
/* 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.
*/
constexpr int ExpectedClass = (sizeof(void *) == 4) ? 1 : 2;
if (data[4] != ExpectedClass) {
*errMsg = QLibrary::tr("'%1' is an invalid ELF object (%2)").arg(*errMsg, QLibrary::tr("wrong cpu architecture"));
return {};
}
// endian
constexpr int ExpectedEndianness = (Q_BYTE_ORDER == Q_LITTLE_ENDIAN) ? 1 : 2;
if (data[5] != ExpectedEndianness) {
*errMsg = QLibrary::tr("'%1' is an invalid ELF object (%2)").arg(*errMsg, QLibrary::tr("odd endianness"));
return {};
}
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 = qFromUnaligned<qelfoff_t> (data);
data += sizeof(qelfoff_t) // e_shoff
+ sizeof(qelfword_t); // e_flags
qelfhalf_t e_shsize = qFromUnaligned<qelfhalf_t> (data);
if (e_shsize > fdlen) {
*errMsg = QLibrary::tr("'%1' is an invalid ELF object (%2)").arg(*errMsg, QLibrary::tr("unexpected e_shsize"));
return {};
}
data += sizeof(qelfhalf_t) // e_ehsize
+ sizeof(qelfhalf_t) // e_phentsize
+ sizeof(qelfhalf_t); // e_phnum
qelfhalf_t e_shentsize = qFromUnaligned<qelfhalf_t> (data);
if (e_shentsize % 4) {
*errMsg = QLibrary::tr("'%1' is an invalid ELF object (%2)").arg(*errMsg, QLibrary::tr("unexpected e_shentsize"));
return {};
}
data += sizeof(qelfhalf_t); // e_shentsize
qelfhalf_t e_shnum = qFromUnaligned<qelfhalf_t> (data);
data += sizeof(qelfhalf_t); // e_shnum
qelfhalf_t e_shtrndx = qFromUnaligned<qelfhalf_t> (data);
data += sizeof(qelfhalf_t); // e_shtrndx
if ((quint32)(e_shnum * e_shentsize) > fdlen) {
const QString message =
QLibrary::tr("announced %n section(s), each %1 byte(s), exceed file size",
nullptr, int(e_shnum)).arg(e_shentsize);
*errMsg = QLibrary::tr("'%1' is an invalid ELF object (%2)").arg(*errMsg, message);
return {};
}
#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 + qelfword_t(e_shentsize) * qelfword_t(e_shtrndx);
if ((soff + e_shentsize) > fdlen || soff % 4 || soff == 0) {
*errMsg = QLibrary::tr("'%1' is an invalid ELF object (%2)")
.arg(*errMsg, QLibrary::tr("shstrtab section header seems to be at %1")
.arg(QString::number(soff, 16)));
return {};
}
parseSectionHeader(dataStart + soff, &strtab);
m_stringTableFileOffset = strtab.offset;
if ((quint32)(strtab.offset + strtab.size) > fdlen || strtab.offset == 0) {
*errMsg = QLibrary::tr("'%1' is an invalid ELF object (%2)")
.arg(*errMsg, QLibrary::tr("string table seems to be at %1")
.arg(QString::number(strtab.offset, 16)));
return {};
}
#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) {
*errMsg = QLibrary::tr("'%1' is an invalid ELF object (%2)")
.arg(*errMsg, QLibrary::tr("section name %1 of %2 behind end of file")
.arg(i).arg(e_shnum));
return {};
}
#if defined(QELFPARSER_DEBUG)
qDebug() << "++++" << i << shnam;
#endif
if (qstrcmp(shnam, ".qtmetadata") == 0 ) {
if (!(sh.type & 0x1)) {
if (shnam[1] == 'r') {
*errMsg = QLibrary::tr("'%1' is an invalid ELF object (%2)")
.arg(*errMsg, QLibrary::tr("empty .rodata. not a library."));
return {};
}
#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 || sh.size < 1) {
*errMsg = QLibrary::tr("'%1' is an invalid ELF object (%2)")
.arg(*errMsg, QLibrary::tr("missing section data. This is not a library."));
return {};
}
if (sh.size < sizeof(QPluginMetaData::MagicHeader)) {
*errMsg = QLibrary::tr("'%1' is an invalid ELF object (%2)")
.arg(*errMsg, QLibrary::tr("section .qtmetadata is too small"));
return {};
}
sh.offset += sizeof(QPluginMetaData::MagicString);
sh.size -= sizeof(QPluginMetaData::MagicString);
return { qsizetype(sh.offset), qsizetype(sh.size) };
}
s += e_shentsize;
}
return {};
}
QT_END_NAMESPACE
#endif // defined(Q_OF_ELF) && defined(Q_CC_GNU)
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