Loading DWARF fails

[JuliusNmn]

Description

I can't load debug info from a binary. file: CWE121_Stack_Based_Buffer_Overflow__CWE193_char_alloca_cpy_72a.o: ELF 64-bit LSB relocatable, x86-64, version 1 (SYSV), with debug_info, not stripped I get the following stack trace:

Python 3.11.6 (main, Oct  8 2023, 05:06:43) [GCC 13.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import cle
>>> cle.Loader("/home/julius/Documents/ML/C/testcases/CWE121_Stack_Based_Buffer_Overflow/s01/CWE121_Stack_Based_Buffer_Overflow__CWE193_char_alloca_cpy_72a.o", load_debug_info=True)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/julius/Documents/ML/venv/lib/python3.11/site-packages/cle/loader.py", line 188, in __init__
    self.initial_load_objects = self._internal_load(
                                ^^^^^^^^^^^^^^^^^^^^
  File "/home/julius/Documents/ML/venv/lib/python3.11/site-packages/cle/loader.py", line 782, in _internal_load
    obj = self._load_object_isolated(main_spec)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/julius/Documents/ML/venv/lib/python3.11/site-packages/cle/loader.py", line 985, in _load_object_isolated
    result = backend_cls(binary, binary_stream, is_main_bin=self._main_object is None, loader=self, **options)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/julius/Documents/ML/venv/lib/python3.11/site-packages/cle/backends/elf/elf.py", line 208, in __init__
    self._load_exception_handling(dwarf)
  File "/home/julius/Documents/ML/venv/lib/python3.11/site-packages/cle/backends/elf/elf.py", line 620, in _load_exception_handling
    lsda_exception_table = lsda.parse_lsda(entry.lsda_pointer, file_offset)
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/julius/Documents/ML/venv/lib/python3.11/site-packages/cle/backends/elf/lsda.py", line 89, in parse_lsda
    header = self._parse_lsda_header()
             ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/julius/Documents/ML/venv/lib/python3.11/site-packages/cle/backends/elf/lsda.py", line 107, in _parse_lsda_header
    lpstart = struct_parse(Struct("dummy", self._formats[base_encoding]("LPStart")), self.stream)["LPStart"]
                                           ~~~~~~~~~~~~~^^^^^^^^^^^^^^^
KeyError: 5
>>> cle.__version__
'9.2.84'
>>> 

Loader works fine if i set load_debug_info=False.

Steps to reproduce the bug

import the attached binary with load_debug_info=True

import cle
cle.Loader("CWE121_Stack_Based_Buffer_Overflow__CWE193_char_alloca_cpy_72a.o", load_debug_info=True)

Environment

Python 3.11.6 (main, Oct 8 2023, 05:06:43) [GCC 13.2.0] on linux

Additional context

CWE121_Stack_Based_Buffer_Overflow__CWE193_char_alloca_cpy_72a.zip