DWARF Debug Information Analysis

When to Use

• Extracting type information, struct layouts, and function signatures from debug symbols
• Analyzing binary layout and memory organization for vulnerability research
• Recovering source-level abstractions from compiled binaries
• Understanding compiler-generated code structure
• Mapping binary addresses back to source locations
• Parsing .debug_info, .debug_line, .debug_frame sections

When NOT to Use

• Source code analysis (use static analysis tools instead)
• Stripped binaries without debug info (use decompilers like Ghidra/IDA)
• Windows PDB files (different format)

Core Tools

# Check for DWARF info
readelf --debug-dump=info binary | head -50
file binary  # Look for "with debug_info"

# Dump all DWARF sections
dwarfdump binary
objdump --dwarf=info binary

# List compilation units
dwarfdump --show-form binary | grep DW_TAG_compile_unit

# Extract type definitions
dwarfdump --name=TargetStruct binary

Key DWARF Tags

Security Applications

• Struct padding analysis: Identify padding bytes that may leak stack data
• Stack frame layout: Map local variable offsets for exploit development
• Type confusion: Verify type sizes and alignment across compilation units
• Function boundary recovery: Accurate function identification for binary analysis
• Source-level debugging: Map crash addresses to source locations

Resources

• DWARF Standard — https://dwarfstd.org/
• libdwarf — https://github.com/davea42/libdwarf-code
• pyelftools — https://github.com/eliben/pyelftools