From 7f8ca6e3679b3af951cb7a4b1377edfaa3244b93 Mon Sep 17 00:00:00 2001 From: Rui Ueyama Date: Wed, 17 Apr 2019 01:47:16 +0000 Subject: [PATCH] lld: Fix initial Mach-O load commands size calculation omitting LC_FUNCTION_STARTS Patch by Nicholas Allegra. The Mach-O writer calculates the size of load commands multiple times. First, Util::assignAddressesToSections() (in MachONormalizedFileFromAtoms.cpp) calculates the size using headerAndLoadCommandsSize() (in MachONormalizedFileBinaryWriter.cpp), which creates a temporary MachOFileLayout for the NormalizedFile, only to retrieve its headerAndLoadCommandsSize. Later, writeBinary() (in MachONormalizedFileBinaryWriter.cpp) creates a new layout and uses the offsets from that layout to actually write out everything in the NormalizedFile. But the NormalizedFile changes between the first computation and the second. When Util::assignAddressesToSections is called, file.functionStarts is always empty because Util::addFunctionStarts has not yet been called. Yet MachOFileLayout decides whether to include a LC_FUNCTION_STARTS command based on whether file.functionStarts is nonempty. Therefore, the initial computation always omits it. Because padding for the __TEXT segment (to make its size a multiple of the page size) is added between the load commands and the first section, LLD still generates a valid binary as long as the amount of padding happens to be large enough to fit LC_FUNCTION_STARTS command, which it usually is. However, it's easy to reproduce the issue by adding a section of a precise size. Given foo.c: __attribute__((section("__TEXT,__foo"))) char foo[0xd78] = {0}; Run: clang -dynamiclib -o foo.dylib foo.c -fuse-ld=lld -install_name /usr/lib/foo.dylib otool -lvv foo.dylib This should produce: truncated or malformed object (offset field of section 1 in LC_SEGMENT_64 command 0 not past the headers of the file) This commit: - Changes MachOFileLayout to always assume LC_FUNCTION_STARTS is present for the initial computation, as long as generating LC_FUNCTION_STARTS is enabled. It would be slightly better to check whether there are actually any functions, since no LC_FUNCTION_STARTS will be generated if not, but it doesn't cause a problem if the initial computation is too high. - Adds a test. - Adds an assert in MachOFileLayout::writeSectionContent() that we are not writing section content into the load commands region (which would happen if the offset was calculated too low due to the initial load commands size calculation being too low). Adds an assert in MachOFileLayout::writeLoadCommands to validate a similar situation where two size-of-load-commands computations are expected to be equivalent. llvm-svn: 358545 --- lld/lib/ReaderWriter/MachO/MachONormalizedFile.h | 3 +- .../MachO/MachONormalizedFileBinaryWriter.cpp | 27 +- .../MachO/MachONormalizedFileFromAtoms.cpp | 3 +- lld/test/mach-o/load-commands-size.yaml | 305 +++++++++++++++++++++ 4 files changed, 326 insertions(+), 12 deletions(-) create mode 100644 lld/test/mach-o/load-commands-size.yaml diff --git a/lld/lib/ReaderWriter/MachO/MachONormalizedFile.h b/lld/lib/ReaderWriter/MachO/MachONormalizedFile.h index 583c765..3ef2949 100644 --- a/lld/lib/ReaderWriter/MachO/MachONormalizedFile.h +++ b/lld/lib/ReaderWriter/MachO/MachONormalizedFile.h @@ -287,7 +287,8 @@ readBinary(std::unique_ptr &mb, /// Takes in-memory normalized view and writes a mach-o object file. llvm::Error writeBinary(const NormalizedFile &file, StringRef path); -size_t headerAndLoadCommandsSize(const NormalizedFile &file); +size_t headerAndLoadCommandsSize(const NormalizedFile &file, + bool includeFunctionStarts); /// Parses a yaml encoded mach-o file to produce an in-memory normalized view. diff --git a/lld/lib/ReaderWriter/MachO/MachONormalizedFileBinaryWriter.cpp b/lld/lib/ReaderWriter/MachO/MachONormalizedFileBinaryWriter.cpp index ed3dfd4..da27c7c 100644 --- a/lld/lib/ReaderWriter/MachO/MachONormalizedFileBinaryWriter.cpp +++ b/lld/lib/ReaderWriter/MachO/MachONormalizedFileBinaryWriter.cpp @@ -108,7 +108,7 @@ private: class MachOFileLayout { public: /// All layout computation is done in the constructor. - MachOFileLayout(const NormalizedFile &file); + MachOFileLayout(const NormalizedFile &file, bool alwaysIncludeFunctionStarts); /// Returns the final file size as computed in the constructor. size_t size() const; @@ -122,7 +122,8 @@ public: llvm::Error writeBinary(StringRef path); private: - uint32_t loadCommandsSize(uint32_t &count); + uint32_t loadCommandsSize(uint32_t &count, + bool alwaysIncludeFunctionStarts); void buildFileOffsets(); void writeMachHeader(); llvm::Error writeLoadCommands(); @@ -231,8 +232,9 @@ private: ByteBuffer _exportTrie; }; -size_t headerAndLoadCommandsSize(const NormalizedFile &file) { - MachOFileLayout layout(file); +size_t headerAndLoadCommandsSize(const NormalizedFile &file, + bool includeFunctionStarts) { + MachOFileLayout layout(file, includeFunctionStarts); return layout.headerAndLoadCommandsSize(); } @@ -249,7 +251,8 @@ size_t MachOFileLayout::headerAndLoadCommandsSize() const { return _endOfLoadCommands; } -MachOFileLayout::MachOFileLayout(const NormalizedFile &file) +MachOFileLayout::MachOFileLayout(const NormalizedFile &file, + bool alwaysIncludeFunctionStarts) : _file(file), _is64(MachOLinkingContext::is64Bit(file.arch)), _swap(!MachOLinkingContext::isHostEndian(file.arch)), @@ -270,7 +273,7 @@ MachOFileLayout::MachOFileLayout(const NormalizedFile &file) _endOfLoadCommands += sizeof(version_min_command); _countOfLoadCommands++; } - if (!_file.functionStarts.empty()) { + if (!_file.functionStarts.empty() || alwaysIncludeFunctionStarts) { _endOfLoadCommands += sizeof(linkedit_data_command); _countOfLoadCommands++; } @@ -325,7 +328,8 @@ MachOFileLayout::MachOFileLayout(const NormalizedFile &file) } else { // Final linked images have one load command per segment. _endOfLoadCommands = _startOfLoadCommands - + loadCommandsSize(_countOfLoadCommands); + + loadCommandsSize(_countOfLoadCommands, + alwaysIncludeFunctionStarts); // Assign section file offsets. buildFileOffsets(); @@ -374,7 +378,8 @@ MachOFileLayout::MachOFileLayout(const NormalizedFile &file) } } -uint32_t MachOFileLayout::loadCommandsSize(uint32_t &count) { +uint32_t MachOFileLayout::loadCommandsSize(uint32_t &count, + bool alwaysIncludeFunctionStarts) { uint32_t size = 0; count = 0; @@ -444,7 +449,7 @@ uint32_t MachOFileLayout::loadCommandsSize(uint32_t &count) { } // Add LC_FUNCTION_STARTS if needed - if (!_file.functionStarts.empty()) { + if (!_file.functionStarts.empty() || alwaysIncludeFunctionStarts) { size += sizeof(linkedit_data_command); ++count; } @@ -1006,6 +1011,7 @@ llvm::Error MachOFileLayout::writeLoadCommands() { lc += sizeof(linkedit_data_command); } } + assert(lc == &_buffer[_endOfLoadCommands]); return llvm::Error::success(); } @@ -1017,6 +1023,7 @@ void MachOFileLayout::writeSectionContent() { if (s.content.empty()) continue; uint32_t offset = _sectInfo[&s].fileOffset; + assert(offset >= _endOfLoadCommands); uint8_t *p = &_buffer[offset]; memcpy(p, &s.content[0], s.content.size()); p += s.content.size(); @@ -1542,7 +1549,7 @@ llvm::Error MachOFileLayout::writeBinary(StringRef path) { /// Takes in-memory normalized view and writes a mach-o object file. llvm::Error writeBinary(const NormalizedFile &file, StringRef path) { - MachOFileLayout layout(file); + MachOFileLayout layout(file, false); return layout.writeBinary(path); } diff --git a/lld/lib/ReaderWriter/MachO/MachONormalizedFileFromAtoms.cpp b/lld/lib/ReaderWriter/MachO/MachONormalizedFileFromAtoms.cpp index 0b73484..1a4603b 100644 --- a/lld/lib/ReaderWriter/MachO/MachONormalizedFileFromAtoms.cpp +++ b/lld/lib/ReaderWriter/MachO/MachONormalizedFileFromAtoms.cpp @@ -587,7 +587,8 @@ void Util::layoutSectionsInTextSegment(size_t hlcSize, SegmentInfo *seg, void Util::assignAddressesToSections(const NormalizedFile &file) { // NOTE!: Keep this in sync with organizeSections. - size_t hlcSize = headerAndLoadCommandsSize(file); + size_t hlcSize = headerAndLoadCommandsSize(file, + _ctx.generateFunctionStartsLoadCommand()); uint64_t address = 0; for (SegmentInfo *seg : _segmentInfos) { if (seg->name.equals("__PAGEZERO")) { diff --git a/lld/test/mach-o/load-commands-size.yaml b/lld/test/mach-o/load-commands-size.yaml new file mode 100644 index 0000000..d1b4dd3 --- /dev/null +++ b/lld/test/mach-o/load-commands-size.yaml @@ -0,0 +1,305 @@ +# RUN: ld64.lld -arch x86_64 %s -o %t -dylib \ +# RUN: -macosx_version_min 10.10 -sdk_version 10.10 \ +# RUN: -install_name /usr/lib/foo.dylib \ +# RUN: %p/Inputs/x86_64/libSystem.yaml && \ +# RUN: llvm-readobj %t + +# (Tests that lld doesn't crash or produce an invalid file.) + +--- !native +path: '' +defined-atoms: + - name: _foo + scope: global + type: unknown + content: [ 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, + 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, + 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, + 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, + 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, + 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, + 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, + 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, + 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, + 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, + 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, + 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, + 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, + 00, 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00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, + 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, + 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, + 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, + 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, + 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, + 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, + 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, + 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, + 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, + 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, + 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, + 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, + 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, + 00, 00, 00, 00 ] + alignment: 16 + section-choice: custom-required + section-name: '__TEXT/__foo' -- 2.7.4