diff options
author | Thiago Macieira <thiago.macieira@intel.com> | 2013-02-28 13:00:19 -0800 |
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committer | The Qt Project <gerrit-noreply@qt-project.org> | 2013-07-20 02:09:26 +0200 |
commit | 62d636a666f38fb4483e2d528f1e175c90f5272a (patch) | |
tree | 20b11b55e659585973fba46cccec808544cb9e9d /src/corelib/plugin/qmachparser.cpp | |
parent | 3fdf69b599457bf32a6620d66faefb940fd21c93 (diff) |
Add a Mach-O decoder to the QPluginLoader
We already had an ELF decoder, which helped us greatly to find the
metadata and that catches most Unix systems (Solaris, QNX, HP-UXi, and
all of the free Unixes). On other Unix systems, aside from Mac OS X,
we simply scanned the entire file for the signature. On Windows, even
without a COFF-PE decoder, we use a LoadLibrary trick to load the
plugin without loading the dependent libraries. In most cases, that
works.
Unfortunately, on Mac OS X we didn't have a decoder and nor could we
do the file scan: because Mac OS X binaries could be fat binaries, we
wouldn't know which architecture's signature we had found.
No more. This adds a full Mach-O decoder to QtCore. It is also capable
of finding the boundaries of the architecture's binary, but that
functionality is disabled since all Qt 5 plugins have plugin metadata
sections.
Change-Id: I2d5c04c5ecf024864b8a43f31ab6b7e6c5eae9ce
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Diffstat (limited to 'src/corelib/plugin/qmachparser.cpp')
-rw-r--r-- | src/corelib/plugin/qmachparser.cpp | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/src/corelib/plugin/qmachparser.cpp b/src/corelib/plugin/qmachparser.cpp new file mode 100644 index 0000000000..b9a56a403c --- /dev/null +++ b/src/corelib/plugin/qmachparser.cpp @@ -0,0 +1,213 @@ +/**************************************************************************** +** +** Copyright (C) 2013 Intel Corporation +** 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 "qmachparser_p.h" + +#if defined(Q_OF_MACH_O) && !defined(QT_NO_LIBRARY) + +#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) +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) +{ + // we test all possibilities so that we report whether a file is a binary or not + const fat_header *fat = reinterpret_cast<const fat_header *>(m_s); + const mach_header *mh = reinterpret_cast<const mach_header *>(m_s); + const mach_header_64 *mh64 = reinterpret_cast<const mach_header_64 *>(m_s); + if (fdlen < sizeof(uint32_t) && fat->magic != qToBigEndian(FAT_MAGIC) + && mh->magic != MH_MAGIC && mh->magic != MH_CIGAM + && mh64->magic != MH_MAGIC_64 && mh64->magic != MH_CIGAM_64) { + if (errorString) + *errorString = QLibrary::tr("'%1' is not a Mach-O binary (%2)").arg(library, QLibrary::tr("invalid magic")); + return NotSuitable; + } + + // find out if this is a fat Mach-O binary first + const my_mach_header *header = 0; + if (fat->magic == qToBigEndian(FAT_MAGIC)) { + // find our architecture in the binary + const fat_arch *arch = reinterpret_cast<const fat_arch *>(m_s + sizeof(*fat)); + if (Q_UNLIKELY(fdlen < sizeof(*fat) + 2 * sizeof(*arch))) { + // fat binaries must contain at least two architectures + 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 + offset > fdlen || size < sizeof(my_mach_header))) + 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"), library, errorString); + if (Q_UNLIKELY(fdlen < sizeof(my_mach_header))) + return ns(QString(), 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)) { + if (Q_UNLIKELY(fdlen < minsize + sizeof(load_command))) + return ns(QString(), library, errorString); + + minsize += seg->cmdsize; + if (Q_UNLIKELY(fdlen < minsize)) + 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 + 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 |