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-rw-r--r--lib/Object/MachOObjectFile.cpp175
1 files changed, 140 insertions, 35 deletions
diff --git a/lib/Object/MachOObjectFile.cpp b/lib/Object/MachOObjectFile.cpp
index bbef639..4a1c311 100644
--- a/lib/Object/MachOObjectFile.cpp
+++ b/lib/Object/MachOObjectFile.cpp
@@ -38,8 +38,12 @@ namespace {
};
}
-template<typename T>
+template <typename T>
static T getStruct(const MachOObjectFile *O, const char *P) {
+ // Don't read before the beginning or past the end of the file
+ if (P < O->getData().begin() || P + sizeof(T) > O->getData().end())
+ report_fatal_error("Malformed MachO file.");
+
T Cmd;
memcpy(&Cmd, P, sizeof(T));
if (O->isLittleEndian() != sys::IsLittleEndianHost)
@@ -47,15 +51,26 @@ static T getStruct(const MachOObjectFile *O, const char *P) {
return Cmd;
}
+template <typename SegmentCmd>
+static uint32_t getSegmentLoadCommandNumSections(const SegmentCmd &S,
+ uint32_t Cmdsize) {
+ const unsigned SectionSize = sizeof(SegmentCmd);
+ if (S.nsects > std::numeric_limits<uint32_t>::max() / SectionSize ||
+ S.nsects * SectionSize > Cmdsize - sizeof(S))
+ report_fatal_error(
+ "Number of sections too large for size of load command.");
+ return S.nsects;
+}
+
static uint32_t
getSegmentLoadCommandNumSections(const MachOObjectFile *O,
const MachOObjectFile::LoadCommandInfo &L) {
- if (O->is64Bit()) {
- MachO::segment_command_64 S = O->getSegment64LoadCommand(L);
- return S.nsects;
- }
- MachO::segment_command S = O->getSegmentLoadCommand(L);
- return S.nsects;
+ if (O->is64Bit())
+ return getSegmentLoadCommandNumSections(O->getSegment64LoadCommand(L),
+ L.C.cmdsize);
+
+ return getSegmentLoadCommandNumSections(O->getSegmentLoadCommand(L),
+ L.C.cmdsize);
}
static bool isPageZeroSegment(const MachOObjectFile *O,
@@ -233,9 +248,13 @@ MachOObjectFile::MachOObjectFile(MemoryBufferRef Object, bool IsLittleEndian,
bool Is64bits, std::error_code &EC)
: ObjectFile(getMachOType(IsLittleEndian, Is64bits), Object),
SymtabLoadCmd(nullptr), DysymtabLoadCmd(nullptr),
- DataInCodeLoadCmd(nullptr), DyldInfoLoadCmd(nullptr),
- UuidLoadCmd(nullptr), HasPageZeroSegment(false) {
+ DataInCodeLoadCmd(nullptr), LinkOptHintsLoadCmd(nullptr),
+ DyldInfoLoadCmd(nullptr), UuidLoadCmd(nullptr),
+ HasPageZeroSegment(false) {
uint32_t LoadCommandCount = this->getHeader().ncmds;
+ if (LoadCommandCount == 0)
+ return;
+
MachO::LoadCommandType SegmentLoadType = is64Bit() ?
MachO::LC_SEGMENT_64 : MachO::LC_SEGMENT;
@@ -262,6 +281,13 @@ MachOObjectFile::MachOObjectFile(MemoryBufferRef Object, bool IsLittleEndian,
return;
}
DataInCodeLoadCmd = Load.Ptr;
+ } else if (Load.C.cmd == MachO::LC_LINKER_OPTIMIZATION_HINT) {
+ // Multiple linker optimization hint tables
+ if (LinkOptHintsLoadCmd) {
+ EC = object_error::parse_failed;
+ return;
+ }
+ LinkOptHintsLoadCmd = Load.Ptr;
} else if (Load.C.cmd == MachO::LC_DYLD_INFO ||
Load.C.cmd == MachO::LC_DYLD_INFO_ONLY) {
// Multiple dyldinfo load commands
@@ -278,6 +304,12 @@ MachOObjectFile::MachOObjectFile(MemoryBufferRef Object, bool IsLittleEndian,
}
UuidLoadCmd = Load.Ptr;
} else if (Load.C.cmd == SegmentLoadType) {
+ const unsigned SegmentLoadSize = this->is64Bit()
+ ? sizeof(MachO::segment_command_64)
+ : sizeof(MachO::segment_command);
+ if (Load.C.cmdsize < SegmentLoadSize)
+ report_fatal_error("Segment load command size is too small.");
+
uint32_t NumSections = getSegmentLoadCommandNumSections(this, Load);
for (unsigned J = 0; J < NumSections; ++J) {
const char *Sec = getSectionPtr(this, Load, J);
@@ -312,10 +344,19 @@ std::error_code MachOObjectFile::getSymbolName(DataRefImpl Symb,
StringRef StringTable = getStringTableData();
MachO::nlist_base Entry = getSymbolTableEntryBase(this, Symb);
const char *Start = &StringTable.data()[Entry.n_strx];
+ if (Start < getData().begin() || Start >= getData().end())
+ report_fatal_error(
+ "Symbol name entry points before beginning or past end of file.");
Res = StringRef(Start);
return object_error::success;
}
+unsigned MachOObjectFile::getSectionType(SectionRef Sec) const {
+ DataRefImpl DRI = Sec.getRawDataRefImpl();
+ uint32_t Flags = getSectionFlags(this, DRI);
+ return Flags & MachO::SECTION_TYPE;
+}
+
// getIndirectName() returns the name of the alias'ed symbol who's string table
// index is in the n_value field.
std::error_code MachOObjectFile::getIndirectName(DataRefImpl Symb,
@@ -469,6 +510,9 @@ uint32_t MachOObjectFile::getSymbolFlags(DataRefImpl DRI) const {
if (Value && Value != UnknownAddressOrSize)
Result |= SymbolRef::SF_Common;
}
+
+ if (!(MachOType & MachO::N_PEXT))
+ Result |= SymbolRef::SF_Exported;
}
if (MachOFlags & (MachO::N_WEAK_REF | MachO::N_WEAK_DEF))
@@ -575,32 +619,11 @@ bool MachOObjectFile::isSectionBSS(DataRefImpl Sec) const {
SectionType == MachO::S_GB_ZEROFILL);
}
-bool MachOObjectFile::isSectionRequiredForExecution(DataRefImpl Sect) const {
- // FIXME: Unimplemented.
- return true;
-}
-
bool MachOObjectFile::isSectionVirtual(DataRefImpl Sec) const {
// FIXME: Unimplemented.
return false;
}
-bool MachOObjectFile::isSectionZeroInit(DataRefImpl Sec) const {
- uint32_t Flags = getSectionFlags(this, Sec);
- unsigned SectionType = Flags & MachO::SECTION_TYPE;
- return SectionType == MachO::S_ZEROFILL ||
- SectionType == MachO::S_GB_ZEROFILL;
-}
-
-bool MachOObjectFile::isSectionReadOnlyData(DataRefImpl Sec) const {
- // Consider using the code from isSectionText to look for __const sections.
- // Alternately, emit S_ATTR_PURE_INSTRUCTIONS and/or S_ATTR_SOME_INSTRUCTIONS
- // to use section attributes to distinguish code from data.
-
- // FIXME: Unimplemented.
- return false;
-}
-
bool MachOObjectFile::sectionContainsSymbol(DataRefImpl Sec,
DataRefImpl Symb) const {
SymbolRef::Type ST;
@@ -1213,7 +1236,8 @@ basic_symbol_iterator MachOObjectFile::getSymbolByIndex(unsigned Index) const {
return basic_symbol_iterator(SymbolRef(DRI, this));
MachO::symtab_command Symtab = getSymtabLoadCommand();
- assert(Index < Symtab.nsyms && "Requested symbol index is out of range.");
+ if (Index >= Symtab.nsyms)
+ report_fatal_error("Requested symbol index is out of range.");
unsigned SymbolTableEntrySize =
is64Bit() ? sizeof(MachO::nlist_64) : sizeof(MachO::nlist);
DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Symtab.symoff));
@@ -1655,7 +1679,10 @@ void ExportEntry::moveNext() {
iterator_range<export_iterator>
MachOObjectFile::exports(ArrayRef<uint8_t> Trie) {
ExportEntry Start(Trie);
- Start.moveToFirst();
+ if (Trie.size() == 0)
+ Start.moveToEnd();
+ else
+ Start.moveToFirst();
ExportEntry Finish(Trie);
Finish.moveToEnd();
@@ -2114,6 +2141,8 @@ MachOObjectFile::getSectionFinalSegmentName(DataRefImpl Sec) const {
ArrayRef<char>
MachOObjectFile::getSectionRawName(DataRefImpl Sec) const {
+ if (Sec.d.a >= Sections.size())
+ report_fatal_error("getSectionRawName: Invalid section index");
const section_base *Base =
reinterpret_cast<const section_base *>(Sections[Sec.d.a]);
return makeArrayRef(Base->sectname);
@@ -2121,6 +2150,8 @@ MachOObjectFile::getSectionRawName(DataRefImpl Sec) const {
ArrayRef<char>
MachOObjectFile::getSectionRawFinalSegmentName(DataRefImpl Sec) const {
+ if (Sec.d.a >= Sections.size())
+ report_fatal_error("getSectionRawFinalSegmentName: Invalid section index");
const section_base *Base =
reinterpret_cast<const section_base *>(Sections[Sec.d.a]);
return makeArrayRef(Base->segname);
@@ -2211,6 +2242,8 @@ MachOObjectFile::getFirstLoadCommandInfo() const {
sizeof(MachO::mach_header);
Load.Ptr = getPtr(this, HeaderSize);
Load.C = getStruct<MachO::load_command>(this, Load.Ptr);
+ if (Load.C.cmdsize < 8)
+ report_fatal_error("Load command with size < 8 bytes.");
return Load;
}
@@ -2219,14 +2252,22 @@ MachOObjectFile::getNextLoadCommandInfo(const LoadCommandInfo &L) const {
MachOObjectFile::LoadCommandInfo Next;
Next.Ptr = L.Ptr + L.C.cmdsize;
Next.C = getStruct<MachO::load_command>(this, Next.Ptr);
+ if (Next.C.cmdsize < 8)
+ report_fatal_error("Load command with size < 8 bytes.");
return Next;
}
MachO::section MachOObjectFile::getSection(DataRefImpl DRI) const {
+ // TODO: What if Sections.size() == 0?
+ if (DRI.d.a >= Sections.size())
+ report_fatal_error("getSection: Invalid section index.");
return getStruct<MachO::section>(this, Sections[DRI.d.a]);
}
MachO::section_64 MachOObjectFile::getSection64(DataRefImpl DRI) const {
+ // TODO: What if Sections.size() == 0?
+ if (DRI.d.a >= Sections.size())
+ report_fatal_error("getSection64: Invalid section index.");
return getStruct<MachO::section_64>(this, Sections[DRI.d.a]);
}
@@ -2269,9 +2310,9 @@ MachOObjectFile::getSegment64LoadCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::segment_command_64>(this, L.Ptr);
}
-MachO::linker_options_command
-MachOObjectFile::getLinkerOptionsLoadCommand(const LoadCommandInfo &L) const {
- return getStruct<MachO::linker_options_command>(this, L.Ptr);
+MachO::linker_option_command
+MachOObjectFile::getLinkerOptionLoadCommand(const LoadCommandInfo &L) const {
+ return getStruct<MachO::linker_option_command>(this, L.Ptr);
}
MachO::version_min_command
@@ -2299,6 +2340,11 @@ MachOObjectFile::getUuidCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::uuid_command>(this, L.Ptr);
}
+MachO::rpath_command
+MachOObjectFile::getRpathCommand(const LoadCommandInfo &L) const {
+ return getStruct<MachO::rpath_command>(this, L.Ptr);
+}
+
MachO::source_version_command
MachOObjectFile::getSourceVersionCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::source_version_command>(this, L.Ptr);
@@ -2309,6 +2355,50 @@ MachOObjectFile::getEntryPointCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::entry_point_command>(this, L.Ptr);
}
+MachO::encryption_info_command
+MachOObjectFile::getEncryptionInfoCommand(const LoadCommandInfo &L) const {
+ return getStruct<MachO::encryption_info_command>(this, L.Ptr);
+}
+
+MachO::encryption_info_command_64
+MachOObjectFile::getEncryptionInfoCommand64(const LoadCommandInfo &L) const {
+ return getStruct<MachO::encryption_info_command_64>(this, L.Ptr);
+}
+
+MachO::sub_framework_command
+MachOObjectFile::getSubFrameworkCommand(const LoadCommandInfo &L) const {
+ return getStruct<MachO::sub_framework_command>(this, L.Ptr);
+}
+
+MachO::sub_umbrella_command
+MachOObjectFile::getSubUmbrellaCommand(const LoadCommandInfo &L) const {
+ return getStruct<MachO::sub_umbrella_command>(this, L.Ptr);
+}
+
+MachO::sub_library_command
+MachOObjectFile::getSubLibraryCommand(const LoadCommandInfo &L) const {
+ return getStruct<MachO::sub_library_command>(this, L.Ptr);
+}
+
+MachO::sub_client_command
+MachOObjectFile::getSubClientCommand(const LoadCommandInfo &L) const {
+ return getStruct<MachO::sub_client_command>(this, L.Ptr);
+}
+
+MachO::routines_command
+MachOObjectFile::getRoutinesCommand(const LoadCommandInfo &L) const {
+ return getStruct<MachO::routines_command>(this, L.Ptr);
+}
+
+MachO::routines_command_64
+MachOObjectFile::getRoutinesCommand64(const LoadCommandInfo &L) const {
+ return getStruct<MachO::routines_command_64>(this, L.Ptr);
+}
+
+MachO::thread_command
+MachOObjectFile::getThreadCommand(const LoadCommandInfo &L) const {
+ return getStruct<MachO::thread_command>(this, L.Ptr);
+}
MachO::any_relocation_info
MachOObjectFile::getRelocation(DataRefImpl Rel) const {
@@ -2415,6 +2505,21 @@ MachOObjectFile::getDataInCodeLoadCommand() const {
return Cmd;
}
+MachO::linkedit_data_command
+MachOObjectFile::getLinkOptHintsLoadCommand() const {
+ if (LinkOptHintsLoadCmd)
+ return getStruct<MachO::linkedit_data_command>(this, LinkOptHintsLoadCmd);
+
+ // If there is no LinkOptHintsLoadCmd return a load command with zero'ed
+ // fields.
+ MachO::linkedit_data_command Cmd;
+ Cmd.cmd = MachO::LC_LINKER_OPTIMIZATION_HINT;
+ Cmd.cmdsize = sizeof(MachO::linkedit_data_command);
+ Cmd.dataoff = 0;
+ Cmd.datasize = 0;
+ return Cmd;
+}
+
ArrayRef<uint8_t> MachOObjectFile::getDyldInfoRebaseOpcodes() const {
if (!DyldInfoLoadCmd)
return ArrayRef<uint8_t>();
generated by cgit v1.1 at 2024-12-22 11:44:01 +0000