From df058699d328598e636fa79684cca45857698e97 Mon Sep 17 00:00:00 2001 From: Michael Trent Date: Wed, 4 Mar 2020 09:10:38 -0800 Subject: [PATCH] Fix dyld opcode *_ADD_ADDR_IMM_SCALED error detection. Summary: Move the check for malformed REBASE_OPCODE_ADD_ADDR_IMM_SCALED and BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED opcodes after the immediate has been applied to the SegmentOffset. This fixes specious errors where SegmentOffset is pointing between two sections when trying to correct the SegmentOffset value. Update the regression tests to verify the proper error message. Reviewers: pete, ab, lhames, steven_wu, jhenderson Reviewed By: pete Subscribers: hiraditya, dexonsmith, rupprecht, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D75629 --- llvm/lib/Object/MachOObjectFile.cpp | 30 ++++-------------------- llvm/test/tools/llvm-objdump/macho-bad-bind.test | 4 ++-- 2 files changed, 6 insertions(+), 28 deletions(-) diff --git a/llvm/lib/Object/MachOObjectFile.cpp b/llvm/lib/Object/MachOObjectFile.cpp index 8540b7a..feea11c 100644 --- a/llvm/lib/Object/MachOObjectFile.cpp +++ b/llvm/lib/Object/MachOObjectFile.cpp @@ -3214,6 +3214,7 @@ void MachORebaseEntry::moveNext() { SegmentOffset) << "\n"); break; case MachO::REBASE_OPCODE_ADD_ADDR_IMM_SCALED: + SegmentOffset += ImmValue * PointerSize; error = O->RebaseEntryCheckSegAndOffsets(SegmentIndex, SegmentOffset, PointerSize); if (error) { @@ -3223,18 +3224,6 @@ void MachORebaseEntry::moveNext() { moveToEnd(); return; } - SegmentOffset += ImmValue * PointerSize; - error = O->RebaseEntryCheckSegAndOffsets(SegmentIndex, SegmentOffset, - PointerSize); - if (error) { - *E = - malformedError("for REBASE_OPCODE_ADD_ADDR_IMM_SCALED " - " (after adding immediate times the pointer size) " + - Twine(error) + " for opcode at: 0x" + - Twine::utohexstr(OpcodeStart - Opcodes.begin())); - moveToEnd(); - return; - } DEBUG_WITH_TYPE("mach-o-rebase", dbgs() << "REBASE_OPCODE_ADD_ADDR_IMM_SCALED: " << format("SegmentOffset=0x%06X", @@ -3803,15 +3792,6 @@ void MachOBindEntry::moveNext() { moveToEnd(); return; } - error = O->BindEntryCheckSegAndOffsets(SegmentIndex, SegmentOffset, - PointerSize); - if (error) { - *E = malformedError("for BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED " + - Twine(error) + " for opcode at: 0x" + - Twine::utohexstr(OpcodeStart - Opcodes.begin())); - moveToEnd(); - return; - } if (SymbolName == StringRef()) { *E = malformedError( "for BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED " @@ -3835,11 +3815,9 @@ void MachOBindEntry::moveNext() { error = O->BindEntryCheckSegAndOffsets(SegmentIndex, SegmentOffset + AdvanceAmount, PointerSize); if (error) { - *E = - malformedError("for BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED " - " (after adding immediate times the pointer size) " + - Twine(error) + " for opcode at: 0x" + - Twine::utohexstr(OpcodeStart - Opcodes.begin())); + *E = malformedError("for BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED " + + Twine(error) + " for opcode at: 0x" + + Twine::utohexstr(OpcodeStart - Opcodes.begin())); moveToEnd(); return; } diff --git a/llvm/test/tools/llvm-objdump/macho-bad-bind.test b/llvm/test/tools/llvm-objdump/macho-bad-bind.test index f8b7cd4..fe089d4 100644 --- a/llvm/test/tools/llvm-objdump/macho-bad-bind.test +++ b/llvm/test/tools/llvm-objdump/macho-bad-bind.test @@ -35,7 +35,7 @@ RUN: not llvm-objdump -macho -bind %p/Inputs/macho-bind-bind-add-addr-uleb 2>&1 ADD-ADDR-ULEB: macho-bind-bind-add-addr-uleb': truncated or malformed object (for BIND_OPCODE_ADD_ADDR_ULEB (after adding ULEB) bad offset, not in section for opcode at: 0x18) RUN: not llvm-objdump -macho -bind %p/Inputs/macho-bind-add-addr-imm-scaled 2>&1 | FileCheck -check-prefix ADD-ADDR-IMM-SCALED %s -ADD-ADDR-IMM-SCALED: macho-bind-add-addr-imm-scaled': truncated or malformed object (for BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED (after adding immediate times the pointer size) bad offset, not in section for opcode at: 0x17) +ADD-ADDR-IMM-SCALED: macho-bind-add-addr-imm-scaled': truncated or malformed object (for BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED bad offset, not in section for opcode at: 0x17) RUN: not llvm-objdump -macho -bind %p/Inputs/macho-bind-uleb-times-skipping-uleb 2>&1 | FileCheck -check-prefix ULEB-TIMES-SKIPPING-ULEB %s ULEB-TIMES-SKIPPING-ULEB: macho-bind-uleb-times-skipping-uleb': truncated or malformed object (for BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB bad offset, not in section for opcode at: 0x17) @@ -83,7 +83,7 @@ RUN: not llvm-objdump -macho -rebase %p/Inputs/macho-rebase-add-addr-uleb 2>&1 | REBASE-ADD-ADDR-ULEB: macho-rebase-add-addr-uleb': truncated or malformed object (for REBASE_OPCODE_ADD_ADDR_ULEB bad offset, not in section for opcode at: 0x3) RUN: not llvm-objdump -macho -rebase %p/Inputs/macho-rebase-add-addr-imm-scaled 2>&1 | FileCheck -check-prefix REBASE-ADD-ADDR-IMM-SCALED %s -REBASE-ADD-ADDR-IMM-SCALED: macho-rebase-add-addr-imm-scaled': truncated or malformed object (for REBASE_OPCODE_ADD_ADDR_IMM_SCALED (after adding immediate times the pointer size) bad offset, not in section for opcode at: 0x3) +REBASE-ADD-ADDR-IMM-SCALED: macho-rebase-add-addr-imm-scaled': truncated or malformed object (for REBASE_OPCODE_ADD_ADDR_IMM_SCALED bad offset, not in section for opcode at: 0x3) RUN: not llvm-objdump -macho -rebase %p/Inputs/macho-rebase-imm-times 2>&1 | FileCheck -check-prefix REBASE-IMM-TIMES %s REBASE-IMM-TIMES: macho-rebase-imm-times': truncated or malformed object (for REBASE_OPCODE_DO_REBASE_IMM_TIMES bad offset, not in section for opcode at: 0x3) -- 2.7.4