Index: include/lld/ReaderWriter/MachOLinkingContext.h =================================================================== --- include/lld/ReaderWriter/MachOLinkingContext.h +++ include/lld/ReaderWriter/MachOLinkingContext.h @@ -143,6 +143,11 @@ uint64_t baseAddress() const { return _baseAddress; } void setBaseAddress(uint64_t baseAddress) { _baseAddress = baseAddress; } + bool padHeaderPaths() const { return _padHeaderPaths; } + void setPadHeaderPaths(bool padHeaderPaths) { + _padHeaderPaths = padHeaderPaths; + } + /// \brief Checks whether a given path on the filesystem exists. /// /// When running in -test_file_usage mode, this method consults an @@ -399,6 +404,7 @@ StringRef _installName; StringRefVector _rpaths; bool _flatNamespace; + bool _padHeaderPaths; UndefinedMode _undefinedMode; bool _deadStrippableDylib; bool _printAtoms; Index: lib/Driver/DarwinLdDriver.cpp =================================================================== --- lib/Driver/DarwinLdDriver.cpp +++ lib/Driver/DarwinLdDriver.cpp @@ -735,6 +735,10 @@ ctx.setStackSize(stackSizeVal); } + // Handle -headerpad_max_install_names + if (parsedArgs.getLastArg(OPT_headerpad_max_install_names)) + ctx.setPadHeaderPaths(true); + // Handle debug info handling options: -S if (parsedArgs.hasArg(OPT_S)) ctx.setDebugInfoMode(MachOLinkingContext::DebugInfoMode::noDebugMap); Index: lib/Driver/DarwinLdOptions.td =================================================================== --- lib/Driver/DarwinLdOptions.td +++ lib/Driver/DarwinLdOptions.td @@ -193,6 +193,8 @@ def rpath : Separate<["-"], "rpath">, MetaVarName<"">, HelpText<"Add path to the runpath search path list for image being created">; +def headerpad_max_install_names : Flag<["-"], "headerpad_max_install_names">, + HelpText<"Pads paths up to MAXPATHLEN for use with install_name_tool">; def t : Flag<["-"], "t">, HelpText<"Print the names of the input files as ld processes them">; Index: lib/ReaderWriter/MachO/MachOLinkingContext.cpp =================================================================== --- lib/ReaderWriter/MachO/MachOLinkingContext.cpp +++ lib/ReaderWriter/MachO/MachOLinkingContext.cpp @@ -144,7 +144,8 @@ _doNothing(false), _pie(false), _arch(arch_unknown), _os(OS::macOSX), _osMinVersion(0), _pageZeroSize(0), _pageSize(4096), _baseAddress(0), _stackSize(0), _compatibilityVersion(0), _currentVersion(0), - _flatNamespace(false), _undefinedMode(UndefinedMode::error), + _flatNamespace(false), _padHeaderPaths(false), + _undefinedMode(UndefinedMode::error), _deadStrippableDylib(false), _printAtoms(false), _testingFileUsage(false), _keepPrivateExterns(false), _demangle(false), _archHandler(nullptr), _exportMode(ExportMode::globals), Index: lib/ReaderWriter/MachO/MachONormalizedFile.h =================================================================== --- lib/ReaderWriter/MachO/MachONormalizedFile.h +++ lib/ReaderWriter/MachO/MachONormalizedFile.h @@ -286,9 +286,11 @@ const MachOLinkingContext::Arch arch); /// Takes in-memory normalized view and writes a mach-o object file. -std::error_code writeBinary(const NormalizedFile &file, StringRef path); +std::error_code writeBinary(const NormalizedFile &file, StringRef path, + const MachOLinkingContext &ctx); -size_t headerAndLoadCommandsSize(const NormalizedFile &file); +size_t headerAndLoadCommandsSize(const NormalizedFile &file, + const MachOLinkingContext &ctxt); /// Parses a yaml encoded mach-o file to produce an in-memory normalized view. Index: lib/ReaderWriter/MachO/MachONormalizedFileBinaryWriter.cpp =================================================================== --- lib/ReaderWriter/MachO/MachONormalizedFileBinaryWriter.cpp +++ lib/ReaderWriter/MachO/MachONormalizedFileBinaryWriter.cpp @@ -55,7 +55,7 @@ class MachOFileLayout { public: /// All layout computation is done in the constructor. - MachOFileLayout(const NormalizedFile &file); + MachOFileLayout(const NormalizedFile &file, const MachOLinkingContext &ctx); /// Returns the final file size as computed in the constructor. size_t size() const; @@ -70,6 +70,7 @@ private: uint32_t loadCommandsSize(uint32_t &count); + void padHeader(); void buildFileOffsets(); void writeMachHeader(); std::error_code writeLoadCommands(); @@ -204,10 +205,12 @@ const bool _is64; const bool _swap; const bool _bigEndianArch; + const bool _padHeaderPaths; uint64_t _seg1addr; uint32_t _startOfLoadCommands; uint32_t _countOfLoadCommands; uint32_t _endOfLoadCommands; + uint32_t _headerPad; uint32_t _startOfRelocations; uint32_t _startOfDataInCode; uint32_t _startOfSymbols; @@ -245,8 +248,9 @@ ByteBuffer _exportTrie; }; -size_t headerAndLoadCommandsSize(const NormalizedFile &file) { - MachOFileLayout layout(file); +size_t headerAndLoadCommandsSize(const NormalizedFile &file, + const MachOLinkingContext &ctx) { + MachOFileLayout layout(file, ctx); return layout.headerAndLoadCommandsSize(); } @@ -260,14 +264,16 @@ size_t MachOFileLayout::headerAndLoadCommandsSize() const { - return _endOfLoadCommands; + return _endOfLoadCommands + _headerPad; } -MachOFileLayout::MachOFileLayout(const NormalizedFile &file) +MachOFileLayout::MachOFileLayout(const NormalizedFile &file, + const MachOLinkingContext &ctx) : _file(file), _is64(MachOLinkingContext::is64Bit(file.arch)), _swap(!MachOLinkingContext::isHostEndian(file.arch)), _bigEndianArch(MachOLinkingContext::isBigEndian(file.arch)), + _padHeaderPaths(ctx.padHeaderPaths()), _seg1addr(INT64_MAX) { _startOfLoadCommands = _is64 ? sizeof(mach_header_64) : sizeof(mach_header); const size_t segCommandBaseSize = @@ -284,6 +290,10 @@ _endOfLoadCommands += sizeof(linkedit_data_command); _countOfLoadCommands++; } + + // object files don't need padded headers. + _headerPad = 0; + // Assign file offsets to each section. _startOfSectionsContent = _endOfLoadCommands; unsigned relocCount = 0; @@ -331,6 +341,8 @@ _endOfLoadCommands = _startOfLoadCommands + loadCommandsSize(_countOfLoadCommands); + padHeader(); + // Assign section file offsets. buildFileOffsets(); buildLinkEditInfo(); @@ -442,6 +454,32 @@ return size; } +void MachOFileLayout::padHeader() { + _headerPad = 0; + if (!_padHeaderPaths) + return; + + // If the user specified -headerpad_max_install_names then we need to + // pad the header with enough space for each path to grow to MAXPATHLEN. + // FIXME!: We need to get the max path in a reliable way. + const unsigned maxpathlen = 1024; + size_t padding = 0; + for (const DependentDylib &dep : _file.dependentDylibs) { + size_t size = pointerAlign(dep.path.size()+1); + if (size < maxpathlen) + padding += maxpathlen - size; + } + + // If creating a dylib, add LC_ID_DYLIB. + if (_file.fileType == llvm::MachO::MH_DYLIB) { + size_t size = pointerAlign(_file.installName.size() + 1); + if (size < maxpathlen) + padding += maxpathlen - size; + } + + _headerPad = padding; +} + static bool overlaps(const Segment &s1, const Segment &s2) { if (s2.address >= s1.address+s1.size) return false; @@ -1337,8 +1375,9 @@ } /// Takes in-memory normalized view and writes a mach-o object file. -std::error_code writeBinary(const NormalizedFile &file, StringRef path) { - MachOFileLayout layout(file); +std::error_code writeBinary(const NormalizedFile &file, StringRef path, + const MachOLinkingContext &ctx) { + MachOFileLayout layout(file, ctx); return layout.writeBinary(path); } Index: lib/ReaderWriter/MachO/MachONormalizedFileFromAtoms.cpp =================================================================== --- lib/ReaderWriter/MachO/MachONormalizedFileFromAtoms.cpp +++ lib/ReaderWriter/MachO/MachONormalizedFileFromAtoms.cpp @@ -480,7 +480,7 @@ void Util::assignAddressesToSections(const NormalizedFile &file) { // NOTE!: Keep this in sync with organizeSections. - size_t hlcSize = headerAndLoadCommandsSize(file); + size_t hlcSize = headerAndLoadCommandsSize(file, _ctx); uint64_t address = 0; for (SegmentInfo *seg : _segmentInfos) { if (seg->name.equals("__PAGEZERO")) { Index: lib/ReaderWriter/MachO/WriterMachO.cpp =================================================================== --- lib/ReaderWriter/MachO/WriterMachO.cpp +++ lib/ReaderWriter/MachO/WriterMachO.cpp @@ -42,7 +42,7 @@ } // Write normalized file as mach-o binary. - return writeBinary(*nFile->get(), path); + return writeBinary(*nFile->get(), path, _ctx); } void createImplicitFiles(std::vector> &r) override { Index: test/mach-o/headerpad_max_install_names.yaml =================================================================== --- /dev/null +++ test/mach-o/headerpad_max_install_names.yaml @@ -0,0 +1,427 @@ +# RUN: lld -flavor darwin -arch x86_64 -dylib %s \ +# RUN: -install_name /usr/lib/libfoo.dylib %p/Inputs/libSystem.yaml -o %t1.dylib +# RUN: lld -flavor darwin -arch x86_64 -dylib %s \ +# RUN: -install_name /usr/lib/libfoo.dylib %p/Inputs/libSystem.yaml -headerpad_max_install_names -o %t2.dylib +# RUN: llvm-objdump -headers %t1.dylib | FileCheck %s --check-prefix=UNPADDED +# RUN: llvm-objdump -headers %t2.dylib | FileCheck %s --check-prefix=PADDED +# +# Note, this test contains a very large text section. The load commands and header are typically around 0x200 +# bytes. This large text section then grows from a page alignment down towards the end of the loads commands. +# The text section here ends around 0x1d0 bytes from the end of the load commands which is enough in a typical +# case, but if we pad names to MAXPATHLEN then that isn't enough space and the text should start one page later. + +# UNPADDED: Sections: +# UNPADDED-NEXT: Idx Name Size Address Type +# UNPADDED-NEXT: 0 __text 00000c28 00000000000003d8 TEXT + +# PADDED: Sections: +# PADDED-NEXT: Idx Name Size Address Type +# PADDED-NEXT: 0 __text 00000c28 00000000000013d8 TEXT + +--- !mach-o +arch: x86_64 +file-type: MH_OBJECT +flags: [ MH_SUBSECTIONS_VIA_SYMBOLS ] +sections: + - segment: __TEXT + section: __text + type: S_REGULAR + attributes: [ S_ATTR_PURE_INSTRUCTIONS, S_ATTR_SOME_INSTRUCTIONS ] + address: 0x0000000000000000 + content: [ 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, + 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, + 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, + 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Index: unittests/MachOTests/MachONormalizedFileBinaryReaderTests.cpp =================================================================== --- unittests/MachOTests/MachONormalizedFileBinaryReaderTests.cpp +++ unittests/MachOTests/MachONormalizedFileBinaryReaderTests.cpp @@ -743,6 +743,7 @@ EXPECT_EQ(printfLabel.type, N_UNDF); EXPECT_EQ(printfLabel.scope, SymbolScope(N_EXT)); - writeBinary(*f, "/tmp/foo.o"); + const lld::MachOLinkingContext ctx; + writeBinary(*f, "/tmp/foo.o", ctx); } Index: unittests/MachOTests/MachONormalizedFileBinaryWriterTests.cpp =================================================================== --- unittests/MachOTests/MachONormalizedFileBinaryWriterTests.cpp +++ unittests/MachOTests/MachONormalizedFileBinaryWriterTests.cpp @@ -111,6 +111,7 @@ TEST(BinaryWriterTest, obj_relocs_x86_64) { SmallString<128> tmpFl; { + const lld::MachOLinkingContext ctx; NormalizedFile f; f.arch = lld::MachOLinkingContext::arch_x86_64; f.fileType = MH_OBJECT; @@ -148,7 +149,7 @@ std::error_code ec = llvm::sys::fs::createTemporaryFile(Twine("xx"), "o", tmpFl); EXPECT_FALSE(ec); - ec = writeBinary(f, tmpFl); + ec = writeBinary(f, tmpFl, ctx); EXPECT_FALSE(ec); } @@ -228,6 +229,7 @@ TEST(BinaryWriterTest, obj_relocs_x86) { SmallString<128> tmpFl; { + const lld::MachOLinkingContext ctx; NormalizedFile f; f.arch = lld::MachOLinkingContext::arch_x86; f.fileType = MH_OBJECT; @@ -260,7 +262,7 @@ std::error_code ec = llvm::sys::fs::createTemporaryFile(Twine("xx"), "o", tmpFl); EXPECT_FALSE(ec); - ec = writeBinary(f, tmpFl); + ec = writeBinary(f, tmpFl, ctx); EXPECT_FALSE(ec); } std::unique_ptr bufferOwner; @@ -338,6 +340,7 @@ TEST(BinaryWriterTest, obj_relocs_armv7) { SmallString<128> tmpFl; { + const lld::MachOLinkingContext ctx; NormalizedFile f; f.arch = lld::MachOLinkingContext::arch_armv7; f.fileType = MH_OBJECT; @@ -378,7 +381,7 @@ std::error_code ec = llvm::sys::fs::createTemporaryFile(Twine("xx"), "o", tmpFl); EXPECT_FALSE(ec); - ec = writeBinary(f, tmpFl); + ec = writeBinary(f, tmpFl, ctx); EXPECT_FALSE(ec); } std::unique_ptr bufferOwner; @@ -467,6 +470,7 @@ TEST(BinaryWriterTest, obj_relocs_ppc) { SmallString<128> tmpFl; { + const lld::MachOLinkingContext ctx; NormalizedFile f; f.arch = lld::MachOLinkingContext::arch_ppc; f.fileType = MH_OBJECT; @@ -534,7 +538,7 @@ std::error_code ec = llvm::sys::fs::createTemporaryFile(Twine("xx"), "o", tmpFl); EXPECT_FALSE(ec); - ec = writeBinary(f, tmpFl); + ec = writeBinary(f, tmpFl, ctx); EXPECT_FALSE(ec); } std::unique_ptr bufferOwner;