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/****************************************************************************
**
** Copyright (C) 2016 Intel Corporation.
** 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 "qmachparser_p.h"
#if defined(Q_OF_MACH_O)
#include <qendian.h>
#include <mach-o/loader.h>
#include <mach-o/fat.h>
QT_BEGIN_NAMESPACE
#if defined(Q_PROCESSOR_X86_64)
# define MACHO64
static const cpu_type_t my_cputype = CPU_TYPE_X86_64;
#elif defined(Q_PROCESSOR_X86_32)
static const cpu_type_t my_cputype = CPU_TYPE_X86;
#elif defined(Q_PROCESSOR_POWER_64)
# define MACHO64
static const cpu_type_t my_cputype = CPU_TYPE_POWERPC64;
#elif defined(Q_PROCESSOR_POWER_32)
static const cpu_type_t my_cputype = CPU_TYPE_POWERPC;
#elif defined(Q_PROCESSOR_ARM_64)
# define MACHO64
static const cpu_type_t my_cputype = CPU_TYPE_ARM64;
#elif defined(Q_PROCESSOR_ARM)
static const cpu_type_t my_cputype = CPU_TYPE_ARM;
#else
# error "Unknown CPU type"
#endif
#ifdef MACHO64
# undef MACHO64
typedef mach_header_64 my_mach_header;
typedef segment_command_64 my_segment_command;
typedef section_64 my_section;
static const uint32_t my_magic = MH_MAGIC_64;
#else
typedef mach_header my_mach_header;
typedef segment_command my_segment_command;
typedef section my_section;
static const uint32_t my_magic = MH_MAGIC;
#endif
Q_DECL_COLD_FUNCTION
static QLibraryScanResult ns(const QString &reason, const QString &library, QString *errorString)
{
if (errorString)
*errorString = QLibrary::tr("'%1' is not a valid Mach-O binary (%2)")
.arg(library, reason.isEmpty() ? QLibrary::tr("file is corrupt") : reason);
return {};
}
QLibraryScanResult QMachOParser::parse(const char *m_s, ulong fdlen, const QString &library, QString *errorString)
{
// The minimum size of a Mach-O binary we're interested in.
// It must have a full Mach header, at least one segment and at least one
// section. It's probably useless with just the "qtmetadata" section, but
// it's valid nonetheless.
// A fat binary must have this plus the fat header, of course.
static const size_t MinFileSize = sizeof(my_mach_header) + sizeof(my_segment_command) + sizeof(my_section);
static const size_t MinFatHeaderSize = sizeof(fat_header) + 2 * sizeof(fat_arch);
if (Q_UNLIKELY(fdlen < MinFileSize))
return ns(QLibrary::tr("file too small"), library, errorString);
// find out if this is a fat Mach-O binary first
const my_mach_header *header = nullptr;
const fat_header *fat = reinterpret_cast<const fat_header *>(m_s);
if (fat->magic == qToBigEndian(FAT_MAGIC)) {
// find our architecture in the binary
const fat_arch *arch = reinterpret_cast<const fat_arch *>(fat + 1);
if (Q_UNLIKELY(fdlen < MinFatHeaderSize)) {
return ns(QLibrary::tr("file too small"), library, errorString);
}
int count = qFromBigEndian(fat->nfat_arch);
if (Q_UNLIKELY(fdlen < sizeof(*fat) + sizeof(*arch) * count))
return ns(QString(), library, errorString);
for (int i = 0; i < count; ++i) {
if (arch[i].cputype == qToBigEndian(my_cputype)) {
// ### should we check the CPU subtype? Maybe on ARM?
uint32_t size = qFromBigEndian(arch[i].size);
uint32_t offset = qFromBigEndian(arch[i].offset);
if (Q_UNLIKELY(size > fdlen) || Q_UNLIKELY(offset > fdlen)
|| Q_UNLIKELY(size + offset > fdlen) || Q_UNLIKELY(size < MinFileSize))
return ns(QString(), library, errorString);
header = reinterpret_cast<const my_mach_header *>(m_s + offset);
fdlen = size;
break;
}
}
if (!header)
return ns(QLibrary::tr("no suitable architecture in fat binary"), library, errorString);
// check the magic again
if (Q_UNLIKELY(header->magic != my_magic))
return ns(QString(), library, errorString);
} else {
header = reinterpret_cast<const my_mach_header *>(m_s);
fat = 0;
// check magic
if (header->magic != my_magic)
return ns(QLibrary::tr("invalid magic %1").arg(qFromBigEndian(header->magic), 8, 16, QLatin1Char('0')),
library, errorString);
}
// from this point on, everything is in host byte order
// (re-)check the CPU type
// ### should we check the CPU subtype? Maybe on ARM?
if (header->cputype != my_cputype) {
if (fat)
return ns(QString(), library, errorString);
return ns(QLibrary::tr("wrong architecture"), library, errorString);
}
// check the file type
if (Q_UNLIKELY(header->filetype != MH_BUNDLE && header->filetype != MH_DYLIB))
return ns(QLibrary::tr("not a dynamic library"), library, errorString);
// find the __TEXT segment, "qtmetadata" section
const my_segment_command *seg = reinterpret_cast<const my_segment_command *>(header + 1);
ulong minsize = sizeof(*header);
for (uint i = 0; i < header->ncmds; ++i,
seg = reinterpret_cast<const my_segment_command *>(reinterpret_cast<const char *>(seg) + seg->cmdsize)) {
// We're sure that the file size includes at least one load command
// but we have to check anyway if we're past the first
if (Q_UNLIKELY(fdlen < minsize + sizeof(load_command)))
return ns(QString(), library, errorString);
// cmdsize can't be trusted until validated
// so check it against fdlen anyway
// (these are unsigned operations, with overflow behavior specified in the standard)
minsize += seg->cmdsize;
if (Q_UNLIKELY(fdlen < minsize) || Q_UNLIKELY(fdlen < seg->cmdsize))
return ns(QString(), library, errorString);
const uint32_t MyLoadCommand = sizeof(void *) > 4 ? LC_SEGMENT_64 : LC_SEGMENT;
if (seg->cmd != MyLoadCommand)
continue;
// is this the __TEXT segment?
if (strcmp(seg->segname, "__TEXT") == 0) {
const my_section *sect = reinterpret_cast<const my_section *>(seg + 1);
for (uint j = 0; j < seg->nsects; ++j) {
// is this the "qtmetadata" section?
if (strcmp(sect[j].sectname, "qtmetadata") != 0)
continue;
// found it!
if (Q_UNLIKELY(fdlen < sect[j].offset) || Q_UNLIKELY(fdlen < sect[j].size)
|| Q_UNLIKELY(fdlen < sect[j].offset + sect[j].size))
return ns(QString(), library, errorString);
qsizetype pos = reinterpret_cast<const char *>(header) - m_s + sect[j].offset;
return { pos, qsizetype(sect[j].size) };
}
}
// other type of segment
seg = reinterpret_cast<const my_segment_command *>(reinterpret_cast<const char *>(seg) + seg->cmdsize);
}
// No .qtmetadata section was found
if (errorString)
*errorString = QLibrary::tr("'%1' is not a Qt plugin").arg(library);
return {};
}
QT_END_NAMESPACE
#endif
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