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[DebugInfo/DWARF] - Test invalid CFI opcodes properly and refine related CFIProgram::parse code.
There are following issues with `CFIProgram::parse` code: 1) Invalid CFI opcodes were never tested. And currently a test would fail when the `LLVM_ENABLE_ABI_BREAKING_CHECKS` is enabled. It happens because the `DataExtractor::Cursor C` remains unchecked when the "Invalid extended CFI opcode" error is reported: ``` .eh_frame section at offset 0x1128 address 0x0: Program aborted due to an unhandled Error: Error value was Success. (Note: Success values must still be checked prior to being destroyed). ``` 2) It is impossible to reach the "Invalid primary CFI opcode" error with the current code. There are 3 possible primary opcode values and all of them are handled. Hence this error should be replaced with llvm_unreachable. 3) Errors currently reported are upper-case. This patch refines the code in the `CFIProgram::parse` method to fix all issues mentioned and adds unit tests for all possible invalid extended CFI opcodes. Differential revision: https://reviews.llvm.org/D82868
This commit is contained in:
Georgii Rymar
parent
54223457e2
commit
6e1353517c
@ -39,18 +39,15 @@ Error CFIProgram::parse(DWARFDataExtractor Data, uint64_t *Offset,
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DataExtractor::Cursor C(*Offset);
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while (C && C.tell() < EndOffset) {
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uint8_t Opcode = Data.getRelocatedValue(C, 1);
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// Some instructions have a primary opcode encoded in the top bits.
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uint8_t Primary = Opcode & DWARF_CFI_PRIMARY_OPCODE_MASK;
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if (!C)
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break;
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if (Primary) {
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// Some instructions have a primary opcode encoded in the top bits.
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if (uint8_t Primary = Opcode & DWARF_CFI_PRIMARY_OPCODE_MASK) {
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// If it's a primary opcode, the first operand is encoded in the bottom
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// bits of the opcode itself.
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uint64_t Op1 = Opcode & DWARF_CFI_PRIMARY_OPERAND_MASK;
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switch (Primary) {
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default:
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return createStringError(errc::illegal_byte_sequence,
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"Invalid primary CFI opcode 0x%" PRIx8,
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Primary);
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case DW_CFA_advance_loc:
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case DW_CFA_restore:
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addInstruction(Primary, Op1);
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@ -58,104 +55,106 @@ Error CFIProgram::parse(DWARFDataExtractor Data, uint64_t *Offset,
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case DW_CFA_offset:
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addInstruction(Primary, Op1, Data.getULEB128(C));
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break;
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}
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} else {
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// Extended opcode - its value is Opcode itself.
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switch (Opcode) {
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default:
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return createStringError(errc::illegal_byte_sequence,
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"Invalid extended CFI opcode 0x%" PRIx8,
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Opcode);
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case DW_CFA_nop:
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case DW_CFA_remember_state:
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case DW_CFA_restore_state:
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case DW_CFA_GNU_window_save:
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// No operands
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addInstruction(Opcode);
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break;
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case DW_CFA_set_loc:
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// Operands: Address
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addInstruction(Opcode, Data.getRelocatedAddress(C));
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break;
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case DW_CFA_advance_loc1:
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// Operands: 1-byte delta
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addInstruction(Opcode, Data.getRelocatedValue(C, 1));
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break;
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case DW_CFA_advance_loc2:
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// Operands: 2-byte delta
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addInstruction(Opcode, Data.getRelocatedValue(C, 2));
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break;
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case DW_CFA_advance_loc4:
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// Operands: 4-byte delta
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addInstruction(Opcode, Data.getRelocatedValue(C, 4));
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break;
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case DW_CFA_restore_extended:
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case DW_CFA_undefined:
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case DW_CFA_same_value:
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case DW_CFA_def_cfa_register:
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case DW_CFA_def_cfa_offset:
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case DW_CFA_GNU_args_size:
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// Operands: ULEB128
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addInstruction(Opcode, Data.getULEB128(C));
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break;
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case DW_CFA_def_cfa_offset_sf:
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// Operands: SLEB128
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addInstruction(Opcode, Data.getSLEB128(C));
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break;
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case DW_CFA_offset_extended:
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case DW_CFA_register:
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case DW_CFA_def_cfa:
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case DW_CFA_val_offset: {
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// Operands: ULEB128, ULEB128
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// Note: We can not embed getULEB128 directly into function
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// argument list. getULEB128 changes Offset and order of evaluation
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// for arguments is unspecified.
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uint64_t op1 = Data.getULEB128(C);
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uint64_t op2 = Data.getULEB128(C);
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addInstruction(Opcode, op1, op2);
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break;
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llvm_unreachable("invalid primary CFI opcode");
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}
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case DW_CFA_offset_extended_sf:
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case DW_CFA_def_cfa_sf:
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case DW_CFA_val_offset_sf: {
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// Operands: ULEB128, SLEB128
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// Note: see comment for the previous case
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uint64_t op1 = Data.getULEB128(C);
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uint64_t op2 = (uint64_t)Data.getSLEB128(C);
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addInstruction(Opcode, op1, op2);
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break;
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}
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case DW_CFA_def_cfa_expression: {
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uint64_t ExprLength = Data.getULEB128(C);
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addInstruction(Opcode, 0);
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StringRef Expression = Data.getBytes(C, ExprLength);
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continue;
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}
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DataExtractor Extractor(Expression, Data.isLittleEndian(),
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Data.getAddressSize());
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// Note. We do not pass the DWARF format to DWARFExpression, because
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// DW_OP_call_ref, the only operation which depends on the format, is
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// prohibited in call frame instructions, see sec. 6.4.2 in DWARFv5.
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Instructions.back().Expression =
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DWARFExpression(Extractor, Data.getAddressSize());
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break;
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}
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case DW_CFA_expression:
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case DW_CFA_val_expression: {
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uint64_t RegNum = Data.getULEB128(C);
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addInstruction(Opcode, RegNum, 0);
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// Extended opcode - its value is Opcode itself.
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switch (Opcode) {
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default:
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return createStringError(errc::illegal_byte_sequence,
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"invalid extended CFI opcode 0x%" PRIx8, Opcode);
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case DW_CFA_nop:
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case DW_CFA_remember_state:
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case DW_CFA_restore_state:
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case DW_CFA_GNU_window_save:
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// No operands
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addInstruction(Opcode);
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break;
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case DW_CFA_set_loc:
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// Operands: Address
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addInstruction(Opcode, Data.getRelocatedAddress(C));
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break;
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case DW_CFA_advance_loc1:
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// Operands: 1-byte delta
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addInstruction(Opcode, Data.getRelocatedValue(C, 1));
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break;
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case DW_CFA_advance_loc2:
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// Operands: 2-byte delta
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addInstruction(Opcode, Data.getRelocatedValue(C, 2));
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break;
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case DW_CFA_advance_loc4:
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// Operands: 4-byte delta
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addInstruction(Opcode, Data.getRelocatedValue(C, 4));
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break;
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case DW_CFA_restore_extended:
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case DW_CFA_undefined:
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case DW_CFA_same_value:
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case DW_CFA_def_cfa_register:
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case DW_CFA_def_cfa_offset:
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case DW_CFA_GNU_args_size:
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// Operands: ULEB128
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addInstruction(Opcode, Data.getULEB128(C));
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break;
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case DW_CFA_def_cfa_offset_sf:
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// Operands: SLEB128
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addInstruction(Opcode, Data.getSLEB128(C));
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break;
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case DW_CFA_offset_extended:
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case DW_CFA_register:
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case DW_CFA_def_cfa:
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case DW_CFA_val_offset: {
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// Operands: ULEB128, ULEB128
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// Note: We can not embed getULEB128 directly into function
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// argument list. getULEB128 changes Offset and order of evaluation
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// for arguments is unspecified.
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uint64_t op1 = Data.getULEB128(C);
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uint64_t op2 = Data.getULEB128(C);
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addInstruction(Opcode, op1, op2);
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break;
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}
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case DW_CFA_offset_extended_sf:
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case DW_CFA_def_cfa_sf:
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case DW_CFA_val_offset_sf: {
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// Operands: ULEB128, SLEB128
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// Note: see comment for the previous case
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uint64_t op1 = Data.getULEB128(C);
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uint64_t op2 = (uint64_t)Data.getSLEB128(C);
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addInstruction(Opcode, op1, op2);
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break;
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}
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case DW_CFA_def_cfa_expression: {
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uint64_t ExprLength = Data.getULEB128(C);
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addInstruction(Opcode, 0);
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StringRef Expression = Data.getBytes(C, ExprLength);
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uint64_t BlockLength = Data.getULEB128(C);
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StringRef Expression = Data.getBytes(C, BlockLength);
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DataExtractor Extractor(Expression, Data.isLittleEndian(),
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Data.getAddressSize());
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// Note. We do not pass the DWARF format to DWARFExpression, because
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// DW_OP_call_ref, the only operation which depends on the format, is
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// prohibited in call frame instructions, see sec. 6.4.2 in DWARFv5.
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Instructions.back().Expression =
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DWARFExpression(Extractor, Data.getAddressSize());
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break;
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}
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}
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DataExtractor Extractor(Expression, Data.isLittleEndian(),
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Data.getAddressSize());
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// Note. We do not pass the DWARF format to DWARFExpression, because
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// DW_OP_call_ref, the only operation which depends on the format, is
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// prohibited in call frame instructions, see sec. 6.4.2 in DWARFv5.
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Instructions.back().Expression =
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DWARFExpression(Extractor, Data.getAddressSize());
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break;
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}
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case DW_CFA_expression:
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case DW_CFA_val_expression: {
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uint64_t RegNum = Data.getULEB128(C);
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addInstruction(Opcode, RegNum, 0);
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uint64_t BlockLength = Data.getULEB128(C);
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StringRef Expression = Data.getBytes(C, BlockLength);
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DataExtractor Extractor(Expression, Data.isLittleEndian(),
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Data.getAddressSize());
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// Note. We do not pass the DWARF format to DWARFExpression, because
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// DW_OP_call_ref, the only operation which depends on the format, is
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// prohibited in call frame instructions, see sec. 6.4.2 in DWARFv5.
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Instructions.back().Expression =
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DWARFExpression(Extractor, Data.getAddressSize());
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break;
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}
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}
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}
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@ -6,6 +6,7 @@
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/DenseSet.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/BinaryFormat/Dwarf.h"
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@ -120,65 +121,116 @@ TEST(DWARFDebugFrame, DumpEH64FDE) {
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"cie=1111ab9a000c pc=4444abcdabcd...5555bcdebcde");
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}
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// Here we test how truncated Call Frame Instructions are parsed.
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TEST(DWARFDebugFrame, ParseTruncatedCFITest) {
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auto ParseCFI = [](dwarf::CIE &C, ArrayRef<uint8_t> Instructions,
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Optional<uint64_t> Size = None) {
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DWARFDataExtractor Data(Instructions, /*IsLittleEndian=*/true,
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/*AddressSize=*/8);
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uint64_t Offset = 0;
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const uint64_t EndOffset = Size ? *Size : (uint64_t)Instructions.size();
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return C.cfis().parse(Data, &Offset, EndOffset);
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};
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static Error parseCFI(dwarf::CIE &C, ArrayRef<uint8_t> Instructions,
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Optional<uint64_t> Size = None) {
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DWARFDataExtractor Data(Instructions, /*IsLittleEndian=*/true,
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/*AddressSize=*/8);
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uint64_t Offset = 0;
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const uint64_t EndOffset = Size ? *Size : (uint64_t)Instructions.size();
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return C.cfis().parse(Data, &Offset, EndOffset);
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}
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TEST(DWARFDebugFrame, InvalidCFIOpcodesTest) {
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llvm::DenseSet<uint8_t> ValidExtendedOpcodes = {
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dwarf::DW_CFA_nop,
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dwarf::DW_CFA_advance_loc,
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dwarf::DW_CFA_offset,
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dwarf::DW_CFA_restore,
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dwarf::DW_CFA_set_loc,
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dwarf::DW_CFA_advance_loc1,
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dwarf::DW_CFA_advance_loc2,
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dwarf::DW_CFA_advance_loc4,
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dwarf::DW_CFA_offset_extended,
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dwarf::DW_CFA_restore_extended,
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dwarf::DW_CFA_undefined,
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dwarf::DW_CFA_same_value,
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dwarf::DW_CFA_register,
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dwarf::DW_CFA_remember_state,
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dwarf::DW_CFA_restore_state,
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dwarf::DW_CFA_def_cfa,
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dwarf::DW_CFA_def_cfa_register,
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dwarf::DW_CFA_def_cfa_offset,
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dwarf::DW_CFA_def_cfa_expression,
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dwarf::DW_CFA_expression,
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dwarf::DW_CFA_offset_extended_sf,
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dwarf::DW_CFA_def_cfa_sf,
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dwarf::DW_CFA_def_cfa_offset_sf,
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dwarf::DW_CFA_val_offset,
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dwarf::DW_CFA_val_offset_sf,
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dwarf::DW_CFA_val_expression,
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dwarf::DW_CFA_MIPS_advance_loc8,
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dwarf::DW_CFA_GNU_window_save,
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dwarf::DW_CFA_AARCH64_negate_ra_state,
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dwarf::DW_CFA_GNU_args_size};
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dwarf::CIE TestCIE = createCIE(/*IsDWARF64=*/false,
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/*Offset=*/0x0,
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/*Length=*/0xff);
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// See DWARF standard v3, section 7.23: low 6 bits are used to encode an
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// extended opcode.
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for (uint8_t Code = 0; Code <= 63; ++Code) {
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if (ValidExtendedOpcodes.count(Code))
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continue;
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EXPECT_THAT_ERROR(parseCFI(TestCIE, Code),
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FailedWithMessage(("invalid extended CFI opcode 0x" +
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Twine::utohexstr(Code))
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.str()
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.c_str()));
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}
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}
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// Here we test how truncated Call Frame Instructions are parsed.
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TEST(DWARFDebugFrame, ParseTruncatedCFITest) {
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dwarf::CIE TestCIE = createCIE(/*IsDWARF64=*/false,
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/*Offset=*/0x0,
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/*Length=*/0xff);
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// Having an empty instructions list is fine.
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EXPECT_THAT_ERROR(ParseCFI(TestCIE, {}), Succeeded());
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EXPECT_THAT_ERROR(parseCFI(TestCIE, {}), Succeeded());
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// Unable to read an opcode, because the instructions list is empty, but we
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// say to the parser that it is not.
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EXPECT_THAT_ERROR(
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ParseCFI(TestCIE, {}, /*Size=*/1),
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parseCFI(TestCIE, {}, /*Size=*/1),
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FailedWithMessage(
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"unexpected end of data at offset 0x0 while reading [0x0, 0x1)"));
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// Unable to read a truncated DW_CFA_offset instruction.
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EXPECT_THAT_ERROR(
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ParseCFI(TestCIE, {dwarf::DW_CFA_offset}),
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parseCFI(TestCIE, {dwarf::DW_CFA_offset}),
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FailedWithMessage("unable to decode LEB128 at offset 0x00000001: "
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"malformed uleb128, extends past end"));
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// Unable to read a truncated DW_CFA_set_loc instruction.
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EXPECT_THAT_ERROR(
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ParseCFI(TestCIE, {dwarf::DW_CFA_set_loc}),
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parseCFI(TestCIE, {dwarf::DW_CFA_set_loc}),
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FailedWithMessage(
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"unexpected end of data at offset 0x1 while reading [0x1, 0x9)"));
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// Unable to read a truncated DW_CFA_advance_loc1 instruction.
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EXPECT_THAT_ERROR(
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ParseCFI(TestCIE, {dwarf::DW_CFA_advance_loc1}),
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parseCFI(TestCIE, {dwarf::DW_CFA_advance_loc1}),
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FailedWithMessage(
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"unexpected end of data at offset 0x1 while reading [0x1, 0x2)"));
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// Unable to read a truncated DW_CFA_advance_loc2 instruction.
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EXPECT_THAT_ERROR(
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ParseCFI(TestCIE, {dwarf::DW_CFA_advance_loc2}),
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parseCFI(TestCIE, {dwarf::DW_CFA_advance_loc2}),
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FailedWithMessage(
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"unexpected end of data at offset 0x1 while reading [0x1, 0x3)"));
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// Unable to read a truncated DW_CFA_advance_loc4 instruction.
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EXPECT_THAT_ERROR(
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ParseCFI(TestCIE, {dwarf::DW_CFA_advance_loc4}),
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parseCFI(TestCIE, {dwarf::DW_CFA_advance_loc4}),
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FailedWithMessage(
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"unexpected end of data at offset 0x1 while reading [0x1, 0x5)"));
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// A test for an instruction with a single ULEB128 operand.
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auto CheckOp_ULEB128 = [&](uint8_t Inst) {
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EXPECT_THAT_ERROR(
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ParseCFI(TestCIE, Inst),
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parseCFI(TestCIE, Inst),
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FailedWithMessage("unable to decode LEB128 at offset 0x00000001: "
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"malformed uleb128, extends past end"));
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};
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@ -191,19 +243,19 @@ TEST(DWARFDebugFrame, ParseTruncatedCFITest) {
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// Unable to read a truncated DW_CFA_def_cfa_offset_sf instruction.
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EXPECT_THAT_ERROR(
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ParseCFI(TestCIE, {dwarf::DW_CFA_def_cfa_offset_sf}),
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parseCFI(TestCIE, {dwarf::DW_CFA_def_cfa_offset_sf}),
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FailedWithMessage("unable to decode LEB128 at offset 0x00000001: "
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"malformed sleb128, extends past end"));
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// A test for an instruction with two ULEB128 operands.
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auto CheckOp_ULEB128_ULEB128 = [&](uint8_t Inst) {
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EXPECT_THAT_ERROR(
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ParseCFI(TestCIE, Inst),
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parseCFI(TestCIE, Inst),
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FailedWithMessage("unable to decode LEB128 at offset 0x00000001: "
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"malformed uleb128, extends past end"));
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EXPECT_THAT_ERROR(
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ParseCFI(TestCIE, {Inst, /*Op1=*/0}),
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parseCFI(TestCIE, {Inst, /*Op1=*/0}),
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FailedWithMessage("unable to decode LEB128 at offset 0x00000002: "
|
||||
"malformed uleb128, extends past end"));
|
||||
};
|
||||
@ -215,12 +267,12 @@ TEST(DWARFDebugFrame, ParseTruncatedCFITest) {
|
||||
// A test for an instruction with two operands: ULEB128, SLEB128.
|
||||
auto CheckOp_ULEB128_SLEB128 = [&](uint8_t Inst) {
|
||||
EXPECT_THAT_ERROR(
|
||||
ParseCFI(TestCIE, Inst),
|
||||
parseCFI(TestCIE, Inst),
|
||||
FailedWithMessage("unable to decode LEB128 at offset 0x00000001: "
|
||||
"malformed uleb128, extends past end"));
|
||||
|
||||
EXPECT_THAT_ERROR(
|
||||
ParseCFI(TestCIE, {Inst, /*Op1=*/0}),
|
||||
parseCFI(TestCIE, {Inst, /*Op1=*/0}),
|
||||
FailedWithMessage("unable to decode LEB128 at offset 0x00000002: "
|
||||
"malformed sleb128, extends past end"));
|
||||
};
|
||||
@ -231,16 +283,16 @@ TEST(DWARFDebugFrame, ParseTruncatedCFITest) {
|
||||
|
||||
// Unable to read a truncated DW_CFA_def_cfa_expression instruction.
|
||||
EXPECT_THAT_ERROR(
|
||||
ParseCFI(TestCIE, {dwarf::DW_CFA_def_cfa_expression}),
|
||||
parseCFI(TestCIE, {dwarf::DW_CFA_def_cfa_expression}),
|
||||
FailedWithMessage("unable to decode LEB128 at offset 0x00000001: "
|
||||
"malformed uleb128, extends past end"));
|
||||
EXPECT_THAT_ERROR(
|
||||
ParseCFI(TestCIE, {dwarf::DW_CFA_def_cfa_expression,
|
||||
parseCFI(TestCIE, {dwarf::DW_CFA_def_cfa_expression,
|
||||
/*expression length=*/0x1}),
|
||||
FailedWithMessage(
|
||||
"unexpected end of data at offset 0x2 while reading [0x2, 0x3)"));
|
||||
// The DW_CFA_def_cfa_expression can contain a zero length expression.
|
||||
EXPECT_THAT_ERROR(ParseCFI(TestCIE, {dwarf::DW_CFA_def_cfa_expression,
|
||||
EXPECT_THAT_ERROR(parseCFI(TestCIE, {dwarf::DW_CFA_def_cfa_expression,
|
||||
/*ExprLen=*/0}),
|
||||
Succeeded());
|
||||
|
||||
@ -248,19 +300,19 @@ TEST(DWARFDebugFrame, ParseTruncatedCFITest) {
|
||||
// (ULEB128) and expression bytes.
|
||||
auto CheckOp_ULEB128_Expr = [&](uint8_t Inst) {
|
||||
EXPECT_THAT_ERROR(
|
||||
ParseCFI(TestCIE, {Inst}),
|
||||
parseCFI(TestCIE, {Inst}),
|
||||
FailedWithMessage("unable to decode LEB128 at offset 0x00000001: "
|
||||
"malformed uleb128, extends past end"));
|
||||
EXPECT_THAT_ERROR(
|
||||
ParseCFI(TestCIE, {Inst, /*Op1=*/0}),
|
||||
parseCFI(TestCIE, {Inst, /*Op1=*/0}),
|
||||
FailedWithMessage("unable to decode LEB128 at offset 0x00000002: "
|
||||
"malformed uleb128, extends past end"));
|
||||
// A zero length expression is fine
|
||||
EXPECT_THAT_ERROR(ParseCFI(TestCIE, {Inst,
|
||||
EXPECT_THAT_ERROR(parseCFI(TestCIE, {Inst,
|
||||
/*Op1=*/0, /*ExprLen=*/0}),
|
||||
Succeeded());
|
||||
EXPECT_THAT_ERROR(
|
||||
ParseCFI(TestCIE, {Inst,
|
||||
parseCFI(TestCIE, {Inst,
|
||||
/*Op1=*/0, /*ExprLen=*/1}),
|
||||
FailedWithMessage(
|
||||
"unexpected end of data at offset 0x3 while reading [0x3, 0x4)"));
|
||||
|
||||
Loading…
Reference in New Issue
Block a user