From 018347762188a984d9c76dfb68b6140261b99f2c Mon Sep 17 00:00:00 2001 From: Filipe Cabecinhas Date: Thu, 15 Jan 2015 22:52:38 +0000 Subject: [PATCH] Report fatal errors instead of segfaulting/asserting on a few invalid accesses while reading MachO files. MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Summary: Shift an older “invalid file” test to get a consistent naming for these tests. Bugs found by afl-fuzz Reviewers: rafael Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D6945 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226219 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Object/MachOObjectFile.cpp | 54 +++++++++++++++--- .../Inputs/macho-invalid-bad-symbol-index | Bin 0 -> 4536 bytes .../Inputs/macho-invalid-getsection-index | Bin 0 -> 316 bytes .../Inputs/macho-invalid-no-size-for-sections | Bin 0 -> 104 bytes ...ection-index-getSectionRawFinalSegmentName | Bin 0 -> 4536 bytes ...ho-invalid-section-index-getSectionRawName | Bin 0 -> 4536 bytes .../Inputs/macho-invalid-symbol-name-past-eof | Bin 0 -> 4536 bytes .../macho-invalid-too-small-load-command | Bin 0 -> 36 bytes ...cho-invalid-too-small-segment-load-command | Bin 0 -> 104 bytes ...ho-zero-ncmds => macho-invalid-zero-ncmds} | Bin .../Inputs/macho64-invalid-getsection-index | Bin 0 -> 4536 bytes .../macho64-invalid-incomplete-load-command | Bin 0 -> 36 bytes .../macho64-invalid-no-size-for-sections | Bin 0 -> 104 bytes .../macho64-invalid-too-small-load-command | Bin 0 -> 40 bytes ...o64-invalid-too-small-segment-load-command | Bin 0 -> 104 bytes test/Object/macho-invalid.test | 51 +++++++++++++++++ test/Object/objdump-macho-quirks.test | 9 --- 17 files changed, 97 insertions(+), 17 deletions(-) create mode 100644 test/Object/Inputs/macho-invalid-bad-symbol-index create mode 100644 test/Object/Inputs/macho-invalid-getsection-index create mode 100644 test/Object/Inputs/macho-invalid-no-size-for-sections create mode 100644 test/Object/Inputs/macho-invalid-section-index-getSectionRawFinalSegmentName create mode 100644 test/Object/Inputs/macho-invalid-section-index-getSectionRawName create mode 100644 test/Object/Inputs/macho-invalid-symbol-name-past-eof create mode 100644 test/Object/Inputs/macho-invalid-too-small-load-command create mode 100644 test/Object/Inputs/macho-invalid-too-small-segment-load-command rename test/Object/Inputs/{macho-zero-ncmds => macho-invalid-zero-ncmds} (100%) create mode 100644 test/Object/Inputs/macho64-invalid-getsection-index create mode 100644 test/Object/Inputs/macho64-invalid-incomplete-load-command create mode 100644 test/Object/Inputs/macho64-invalid-no-size-for-sections create mode 100644 test/Object/Inputs/macho64-invalid-too-small-load-command create mode 100644 test/Object/Inputs/macho64-invalid-too-small-segment-load-command create mode 100644 test/Object/macho-invalid.test delete mode 100644 test/Object/objdump-macho-quirks.test diff --git a/lib/Object/MachOObjectFile.cpp b/lib/Object/MachOObjectFile.cpp index 978988c2569..a367a49f6bc 100644 --- a/lib/Object/MachOObjectFile.cpp +++ b/lib/Object/MachOObjectFile.cpp @@ -38,8 +38,12 @@ namespace { }; } -template +template 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 +static uint32_t getSegmentLoadCommandNumSections(const SegmentCmd &S, + uint32_t Cmdsize) { + const unsigned SectionSize = sizeof(SegmentCmd); + if (S.nsects > std::numeric_limits::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, @@ -281,6 +296,12 @@ 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); @@ -315,6 +336,8 @@ 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().end()) + report_fatal_error("Symbol name entry points past end of file."); Res = StringRef(Start); return object_error::success; } @@ -1204,7 +1227,8 @@ 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(getPtr(this, Symtab.symoff)); @@ -2108,6 +2132,8 @@ MachOObjectFile::getSectionFinalSegmentName(DataRefImpl Sec) const { ArrayRef MachOObjectFile::getSectionRawName(DataRefImpl Sec) const { + if (Sec.d.a >= Sections.size()) + report_fatal_error("getSectionRawName: Invalid section index"); const section_base *Base = reinterpret_cast(Sections[Sec.d.a]); return makeArrayRef(Base->sectname); @@ -2115,6 +2141,8 @@ MachOObjectFile::getSectionRawName(DataRefImpl Sec) const { ArrayRef MachOObjectFile::getSectionRawFinalSegmentName(DataRefImpl Sec) const { + if (Sec.d.a >= Sections.size()) + report_fatal_error("getSectionRawFinalSegmentName: Invalid section index"); const section_base *Base = reinterpret_cast(Sections[Sec.d.a]); return makeArrayRef(Base->segname); @@ -2205,6 +2233,8 @@ MachOObjectFile::getFirstLoadCommandInfo() const { sizeof(MachO::mach_header); Load.Ptr = getPtr(this, HeaderSize); Load.C = getStruct(this, Load.Ptr); + if (Load.C.cmdsize < 8) + report_fatal_error("Load command with size < 8 bytes."); return Load; } @@ -2213,14 +2243,22 @@ MachOObjectFile::getNextLoadCommandInfo(const LoadCommandInfo &L) const { MachOObjectFile::LoadCommandInfo Next; Next.Ptr = L.Ptr + L.C.cmdsize; Next.C = getStruct(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(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(this, Sections[DRI.d.a]); } diff --git a/test/Object/Inputs/macho-invalid-bad-symbol-index b/test/Object/Inputs/macho-invalid-bad-symbol-index new file mode 100644 index 0000000000000000000000000000000000000000..294bbde3ddfffbf5102115ae5428cb1b81936d23 GIT binary patch literal 4536 zcmeHLK~EDw6rKeI0*zF|K_iK%Xi!53wQ5N`sId{EL4=YR6P@g`Q&`g$>~5j;puKqT zhS4iO!8;e@!GlNt0rBF|KR}G}`?j-o+tkD#urGN#^SycV-pn_>eEoLt^Y@?-R=*I< 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--git a/test/Object/Inputs/macho64-invalid-too-small-segment-load-command b/test/Object/Inputs/macho64-invalid-too-small-segment-load-command new file mode 100644 index 0000000000000000000000000000000000000000..ce6a20134a99c27934e832962d4a6a3001dad34d GIT binary patch literal 104 rcmX^A>+L@VC}0HAAnXAX0Me2`><+~7@lK8|@jm{JF2PYq(nK=>hDHbw literal 0 HcmV?d00001 diff --git a/test/Object/macho-invalid.test b/test/Object/macho-invalid.test new file mode 100644 index 00000000000..138d8eb1f3d --- /dev/null +++ b/test/Object/macho-invalid.test @@ -0,0 +1,51 @@ +// No crash, might not be totally invalid +RUN: llvm-objdump -private-headers %p/Inputs/macho-invalid-zero-ncmds + +RUN: not llvm-objdump -private-headers %p/Inputs/macho64-invalid-incomplete-load-command 2>&1 \ +RUN: | FileCheck -check-prefix INCOMPLETE-LOADC %s + +RUN: not llvm-objdump -private-headers %p/Inputs/macho-invalid-too-small-load-command 2>&1 \ +RUN: | FileCheck -check-prefix SMALL-LOADC-SIZE %s +RUN: not llvm-objdump -private-headers %p/Inputs/macho64-invalid-too-small-load-command 2>&1 \ +RUN: | FileCheck -check-prefix SMALL-LOADC-SIZE %s + +RUN: not llvm-objdump -private-headers %p/Inputs/macho-invalid-too-small-segment-load-command 2>&1 \ +RUN: | FileCheck -check-prefix SMALL-SEGLOADC-SIZE %s +RUN: not llvm-objdump -private-headers %p/Inputs/macho64-invalid-too-small-segment-load-command 2>&1 \ +RUN: | FileCheck -check-prefix SMALL-SEGLOADC-SIZE %s + +RUN: not llvm-objdump -private-headers %p/Inputs/macho-invalid-no-size-for-sections 2>&1 \ +RUN: | FileCheck -check-prefix TOO-MANY-SECTS %s +RUN: not llvm-objdump -private-headers %p/Inputs/macho64-invalid-no-size-for-sections 2>&1 \ +RUN: | FileCheck -check-prefix TOO-MANY-SECTS %s + +RUN: not llvm-objdump -t %p/Inputs/macho-invalid-bad-symbol-index 2>&1 \ +RUN: | FileCheck -check-prefix BAD-SYMBOL %s + +RUN: not llvm-objdump -t %p/Inputs/macho-invalid-symbol-name-past-eof 2>&1 \ +RUN: | FileCheck -check-prefix NAME-PAST-EOF %s + +RUN: not llvm-objdump -t %p/Inputs/macho-invalid-section-index-getSectionRawFinalSegmentName 2>&1 \ +RUN: | FileCheck -check-prefix INVALID-SECTION-IDX-SEG-NAME %s + +RUN: not llvm-nm %p/Inputs/macho-invalid-section-index-getSectionRawName 2>&1 \ +RUN: | FileCheck -check-prefix INVALID-SECTION-IDX-SECT-NAME %s + +RUN: not llvm-objdump -t %p/Inputs/macho-invalid-getsection-index 2>&1 \ +RUN: | FileCheck -check-prefix INVALID-SECTION-IDX-GETSECT %s + +RUN: not llvm-objdump -t %p/Inputs/macho64-invalid-getsection-index 2>&1 \ +RUN: | FileCheck -check-prefix INVALID-SECTION-IDX-GETSECT64 %s + + +SMALL-LOADC-SIZE: Load command with size < 8 bytes +SMALL-SEGLOADC-SIZE: Segment load command size is too small +INCOMPLETE-LOADC: Malformed MachO file +TOO-MANY-SECTS: Number of sections too large for size of load command +BAD-SYMBOL: Requested symbol index is out of range +NAME-PAST-EOF: Symbol name entry points past end of file + +INVALID-SECTION-IDX-SEG-NAME: getSectionRawFinalSegmentName: Invalid section index +INVALID-SECTION-IDX-SECT-NAME: getSectionRawName: Invalid section index +INVALID-SECTION-IDX-GETSECT: getSection: Invalid section index +INVALID-SECTION-IDX-GETSECT64: getSection64: Invalid section index diff --git a/test/Object/objdump-macho-quirks.test b/test/Object/objdump-macho-quirks.test deleted file mode 100644 index eeee1537def..00000000000 --- a/test/Object/objdump-macho-quirks.test +++ /dev/null @@ -1,9 +0,0 @@ -RUN: llvm-objdump -private-headers %p/Inputs/macho-zero-ncmds \ -RUN: | FileCheck %s -check-prefix A - -// Check that we don't get an infinite loop if ncmds = 0 -A: file format Mach-O 64-bit unknown -A: Mach header -A: magic cputype cpusubtype caps filetype ncmds sizeofcmds flags -A: MH_MAGIC_64 0x00 OBJECT 0 0 0x00000000 - -- 2.34.1