/**************************************************************************** ** ** 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 #include "qlibrary_p.h" #include #include 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 static int 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 QMachOParser::NotSuitable; } int QMachOParser::parse(const char *m_s, ulong fdlen, const QString &library, QString *errorString, long *pos, ulong *sectionlen) { // 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 = 0; const fat_header *fat = reinterpret_cast(m_s); if (fat->magic == qToBigEndian(FAT_MAGIC)) { // find our architecture in the binary const fat_arch *arch = reinterpret_cast(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(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(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, fdlen is specific to this architecture // from this point on, everything is in host byte order *pos = reinterpret_cast(header) - m_s; // (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(header + 1); ulong minsize = sizeof(*header); for (uint i = 0; i < header->ncmds; ++i, seg = reinterpret_cast(reinterpret_cast(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(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); *pos += sect[j].offset; *sectionlen = sect[j].size; return QtMetaDataSection; } } // other type of segment seg = reinterpret_cast(reinterpret_cast(seg) + seg->cmdsize); } // // No Qt section was found, but at least we know that where the proper architecture's boundaries are // return NoQtSection; if (errorString) *errorString = QLibrary::tr("'%1' is not a Qt plugin").arg(library); return NotSuitable; } QT_END_NAMESPACE #endif