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| ** Copyright (C) 2016 Intel Corporation. |
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| ****************************************************************************/ |
| |
| #include "qmachparser_p.h" |
| |
| #if defined(Q_OF_MACH_O) |
| |
| #include <qendian.h> |
| #include "qlibrary_p.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 |
| |
| 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, qsizetype *pos, qsizetype *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<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, fdlen is specific to this architecture |
| // from this point on, everything is in host byte order |
| *pos = reinterpret_cast<const char *>(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<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); |
| |
| *pos += sect[j].offset; |
| *sectionlen = sect[j].size; |
| return QtMetaDataSection; |
| } |
| } |
| |
| // other type of segment |
| seg = reinterpret_cast<const my_segment_command *>(reinterpret_cast<const char *>(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 |
