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Differential D15943

Add support for headerpad_max_install_names cmdline option
Needs ReviewPublic

Authored by pete on Jan 6 2016, 5:18 PM.

Details

Reviewers
lhames
Summary

Hi Lang

This adds support for -headerpad_max_install_names which pads the header by enough bytes so that the dylib ID and loaded dylib paths can all be extended to MAXPATHLEN.

Thanks,
Pete

Diff Detail

Event Timeline

pete updated this revision to Diff 44183.Jan 6 2016, 5:18 PM
pete retitled this revision from to Add support for headerpad_max_install_names cmdline option.
pete updated this object.
pete added a reviewer: lhames.
pete added a project: lld.
pete added subscribers: kledzik, llvm-commits.
kledzik added inline comments.Jan 7 2016, 11:16 AM
lib/ReaderWriter/MachO/MachONormalizedFile.h
289–290

This is a design change. writeBinary() has only depended on the NormalizedFile object - not the LinkingContext. That is, for extra info like this, we add a new field to NormalizedFile.

pete added inline comments.Jan 7 2016, 11:19 AM
lib/ReaderWriter/MachO/MachONormalizedFile.h
289–290

Yeah, i was wondering whether the right thing was to add a new field or pass in the context. Thanks for clarifying the intended dependencies of writeBinary. I'll make this change now.

pete updated this revision to Diff 44238.Jan 7 2016, 11:29 AM

Updated to no longer pass the context to functions, but instead put a padHeaderPaths bool inside NormalizedFile.

pete mentioned this in D15956: Support -headerpad cmdline option.Jan 7 2016, 12:40 PM
lhames added inline comments.Jan 20 2016, 6:51 PM
lib/ReaderWriter/MachO/MachONormalizedFileBinaryWriter.cpp
462

We may want to add a command line option (with a default of 1024) for this eventually, but we can deal with that separately.

466

Is this pointerAlign necessary?

I don't think it matters much either way, but consider a 1 character path name on a 64-bit platform: With this pointerAlign that original path length will be "aligned" out to 8, then padded with 1016 bytes. Then, at write-out time the 1017 characters (1 char path plus padding) will be aligned back up to 1024.

Alternatively, I think we can ditch this and just add 1023 bytes of padding up front, for 1024 bytes total, at which point the second pointerAlign call is a no-op.

That said I haven't actually *tried* this, and you might have. If you did and it exploded, feel free to disregard this suggestion. ;)

473

Likewise for this pointerAlign.

pete added inline comments.Feb 11 2016, 3:52 PM
lib/ReaderWriter/MachO/MachONormalizedFileBinaryWriter.cpp
462

Sounds good. Will do that in a follow up if we need it.

466

You're right. Its not needed.

I think I got this by copying the cmdsize from the macho writer which is aligning the string up to pointer align so that the load command is the correct length. But thats not needed here when we are just padding them out. I'll remove it and the other pointerAlign call

Revision Contents

Diff 44238

include/lld/ReaderWriter/MachOLinkingContext.h

Context not available.
uint64_t baseAddress() const { return _baseAddress; } uint64_t baseAddress() const { return _baseAddress; }
void setBaseAddress(uint64_t baseAddress) { _baseAddress = 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. /// \brief Checks whether a given path on the filesystem exists.
/// ///
/// When running in -test_file_usage mode, this method consults an /// When running in -test_file_usage mode, this method consults an
Context not available.
StringRef _installName; StringRef _installName;
StringRefVector _rpaths; StringRefVector _rpaths;
bool _flatNamespace; bool _flatNamespace;
bool _padHeaderPaths;
UndefinedMode _undefinedMode; UndefinedMode _undefinedMode;
bool _deadStrippableDylib; bool _deadStrippableDylib;
bool _printAtoms; bool _printAtoms;
Context not available.

lib/Driver/DarwinLdDriver.cpp

Context not available.
ctx.setStackSize(stackSizeVal); 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 // Handle debug info handling options: -S
if (parsedArgs.hasArg(OPT_S)) if (parsedArgs.hasArg(OPT_S))
ctx.setDebugInfoMode(MachOLinkingContext::DebugInfoMode::noDebugMap); ctx.setDebugInfoMode(MachOLinkingContext::DebugInfoMode::noDebugMap);
Context not available.

lib/Driver/DarwinLdOptions.td

Context not available.
def rpath : Separate<["-"], "rpath">, def rpath : Separate<["-"], "rpath">,
MetaVarName<"<path>">, MetaVarName<"<path>">,
HelpText<"Add path to the runpath search path list for image being created">; 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">, def t : Flag<["-"], "t">,
HelpText<"Print the names of the input files as ld processes them">; HelpText<"Print the names of the input files as ld processes them">;
Context not available.

lib/ReaderWriter/MachO/MachOLinkingContext.cpp

Context not available.
_doNothing(false), _pie(false), _arch(arch_unknown), _os(OS::macOSX), _doNothing(false), _pie(false), _arch(arch_unknown), _os(OS::macOSX),
_osMinVersion(0), _pageZeroSize(0), _pageSize(4096), _baseAddress(0), _osMinVersion(0), _pageZeroSize(0), _pageSize(4096), _baseAddress(0),
_stackSize(0), _compatibilityVersion(0), _currentVersion(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), _deadStrippableDylib(false), _printAtoms(false), _testingFileUsage(false),
_keepPrivateExterns(false), _demangle(false), _archHandler(nullptr), _keepPrivateExterns(false), _demangle(false), _archHandler(nullptr),
_exportMode(ExportMode::globals), _exportMode(ExportMode::globals),
Context not available.

lib/ReaderWriter/MachO/MachONormalizedFile.h

Context not available.
PackedVersion compatVersion = 0; // dylibs only PackedVersion compatVersion = 0; // dylibs only
PackedVersion currentVersion = 0; // dylibs only PackedVersion currentVersion = 0; // dylibs only
bool hasUUID = false; bool hasUUID = false;
bool padHeaderPaths = false;
std::vector<StringRef> rpaths; std::vector<StringRef> rpaths;
Hex64 entryAddress = 0; Hex64 entryAddress = 0;
Hex64 stackSize = 0; Hex64 stackSize = 0;
Context not available.
kledzikUnsubmitted
Not Done
ReplyInline Actions

This is a design change. writeBinary() has only depended on the NormalizedFile object - not the LinkingContext. That is, for extra info like this, we add a new field to NormalizedFile.

kledzik: This is a design change. writeBinary() has only depended on the NormalizedFile object - not…
peteAuthorUnsubmitted
Not Done
ReplyInline Actions

Yeah, i was wondering whether the right thing was to add a new field or pass in the context. Thanks for clarifying the intended dependencies of writeBinary. I'll make this change now.

pete: Yeah, i was wondering whether the right thing was to add a new field or pass in the context.

lib/ReaderWriter/MachO/MachONormalizedFileBinaryWriter.cpp

Context not available.
private: private:
uint32_t loadCommandsSize(uint32_t &count); uint32_t loadCommandsSize(uint32_t &count);
void padHeader();
void buildFileOffsets(); void buildFileOffsets();
void writeMachHeader(); void writeMachHeader();
std::error_code writeLoadCommands(); std::error_code writeLoadCommands();
Context not available.
const bool _is64; const bool _is64;
const bool _swap; const bool _swap;
const bool _bigEndianArch; const bool _bigEndianArch;
const bool _padHeaderPaths;
uint64_t _seg1addr; uint64_t _seg1addr;
uint32_t _startOfLoadCommands; uint32_t _startOfLoadCommands;
uint32_t _countOfLoadCommands; uint32_t _countOfLoadCommands;
uint32_t _endOfLoadCommands; uint32_t _endOfLoadCommands;
uint32_t _headerPad;
uint32_t _startOfRelocations; uint32_t _startOfRelocations;
uint32_t _startOfDataInCode; uint32_t _startOfDataInCode;
uint32_t _startOfSymbols; uint32_t _startOfSymbols;
Context not available.
size_t MachOFileLayout::headerAndLoadCommandsSize() const { size_t MachOFileLayout::headerAndLoadCommandsSize() const {
return _endOfLoadCommands; return _endOfLoadCommands + _headerPad;
} }
MachOFileLayout::MachOFileLayout(const NormalizedFile &file) MachOFileLayout::MachOFileLayout(const NormalizedFile &file)
Context not available.
_is64(MachOLinkingContext::is64Bit(file.arch)), _is64(MachOLinkingContext::is64Bit(file.arch)),
_swap(!MachOLinkingContext::isHostEndian(file.arch)), _swap(!MachOLinkingContext::isHostEndian(file.arch)),
_bigEndianArch(MachOLinkingContext::isBigEndian(file.arch)), _bigEndianArch(MachOLinkingContext::isBigEndian(file.arch)),
_padHeaderPaths(file.padHeaderPaths),
_seg1addr(INT64_MAX) { _seg1addr(INT64_MAX) {
_startOfLoadCommands = _is64 ? sizeof(mach_header_64) : sizeof(mach_header); _startOfLoadCommands = _is64 ? sizeof(mach_header_64) : sizeof(mach_header);
const size_t segCommandBaseSize = const size_t segCommandBaseSize =
Context not available.
_endOfLoadCommands += sizeof(linkedit_data_command); _endOfLoadCommands += sizeof(linkedit_data_command);
_countOfLoadCommands++; _countOfLoadCommands++;
} }
// object files don't need padded headers.
_headerPad = 0;
// Assign file offsets to each section. // Assign file offsets to each section.
_startOfSectionsContent = _endOfLoadCommands; _startOfSectionsContent = _endOfLoadCommands;
unsigned relocCount = 0; unsigned relocCount = 0;
Context not available.
_endOfLoadCommands = _startOfLoadCommands _endOfLoadCommands = _startOfLoadCommands
+ loadCommandsSize(_countOfLoadCommands); + loadCommandsSize(_countOfLoadCommands);
padHeader();
// Assign section file offsets. // Assign section file offsets.
buildFileOffsets(); buildFileOffsets();
buildLinkEditInfo(); buildLinkEditInfo();
Context not available.
return size; 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.
lhamesUnsubmitted
Not Done
ReplyInline Actions

We may want to add a command line option (with a default of 1024) for this eventually, but we can deal with that separately.

lhames: We may want to add a command line option (with a default of 1024) for this eventually, but we…
peteAuthorUnsubmitted
Not Done
ReplyInline Actions

Sounds good. Will do that in a follow up if we need it.

pete: Sounds good. Will do that in a follow up if we need it.
const unsigned maxpathlen = 1024;
size_t padding = 0;
for (const DependentDylib &dep : _file.dependentDylibs) {
size_t size = pointerAlign(dep.path.size()+1);
lhamesUnsubmitted
Not Done
ReplyInline Actions

Is this pointerAlign necessary?

I don't think it matters much either way, but consider a 1 character path name on a 64-bit platform: With this pointerAlign that original path length will be "aligned" out to 8, then padded with 1016 bytes. Then, at write-out time the 1017 characters (1 char path plus padding) will be aligned back up to 1024.

Alternatively, I think we can ditch this and just add 1023 bytes of padding up front, for 1024 bytes total, at which point the second pointerAlign call is a no-op.

That said I haven't actually *tried* this, and you might have. If you did and it exploded, feel free to disregard this suggestion. ;)

lhames: Is this pointerAlign necessary? I don't think it matters much either way, but consider a 1…
peteAuthorUnsubmitted
Not Done
ReplyInline Actions

You're right. Its not needed.

I think I got this by copying the cmdsize from the macho writer which is aligning the string up to pointer align so that the load command is the correct length. But thats not needed here when we are just padding them out. I'll remove it and the other pointerAlign call

pete: You're right. Its not needed. I think I got this by copying the cmdsize from the macho…
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);
lhamesUnsubmitted
Not Done
ReplyInline Actions

Likewise for this pointerAlign.

lhames: Likewise for this pointerAlign.
if (size < maxpathlen)
padding += maxpathlen - size;
}
_headerPad = padding;
}
static bool overlaps(const Segment &s1, const Segment &s2) { static bool overlaps(const Segment &s1, const Segment &s2) {
if (s2.address >= s1.address+s1.size) if (s2.address >= s1.address+s1.size)
return false; return false;
Context not available.

lib/ReaderWriter/MachO/MachONormalizedFileFromAtoms.cpp

Context not available.
normFile.compatVersion = context.compatibilityVersion(); normFile.compatVersion = context.compatibilityVersion();
normFile.pageSize = context.pageSize(); normFile.pageSize = context.pageSize();
normFile.rpaths = context.rpaths(); normFile.rpaths = context.rpaths();
normFile.padHeaderPaths = context.padHeaderPaths();
util.addDependentDylibs(atomFile, normFile); util.addDependentDylibs(atomFile, normFile);
util.copySegmentInfo(normFile); util.copySegmentInfo(normFile);
util.copySectionInfo(normFile); util.copySectionInfo(normFile);
Context not available.

test/mach-o/headerpad_max_install_names.yaml

  • This file was added.
# 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
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global-symbols:
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type: N_SECT
scope: [ N_EXT ]
sect: 1
value: 0x0000000000000000
...