Unhandled FormatField Exception

[rpm5099]

This is very likely caused by corruption in an elf file, but I thought you might want to look into the possible cause. Unfortunately I do not have a sample I can provide. Here is the traceback:

---------------------------------------------------------------------------
FieldError                                Traceback (most recent call last)
File ~/miniconda3/envs/py3114/lib/python3.11/site-packages/elftools/construct/core.py:351, in FormatField._parse(self, stream, context)
    350 try:
--> 351     return self.packer.unpack(_read_stream(stream, self.length))[0]
    352 except Exception as ex:

File ~/miniconda3/envs/py3114/lib/python3.11/site-packages/elftools/construct/core.py:293, in _read_stream(stream, length)
    292 if len(data) != length:
--> 293     raise FieldError("expected %d, found %d" % (length, len(data)))
    294 return data

FieldError: expected 4, found 0

During handling of the above exception, another exception occurred:

FieldError                                Traceback (most recent call last)
File ~/miniconda3/envs/py3114/lib/python3.11/site-packages/elftools/common/utils.py:41, in struct_parse(struct, stream, stream_pos)
     40         stream.seek(stream_pos)
---> 41     return struct.parse_stream(stream)
     42 except ConstructError as e:

File ~/miniconda3/envs/py3114/lib/python3.11/site-packages/elftools/construct/core.py:190, in Construct.parse_stream(self, stream)
    183 """
    184 Parse a stream.
    185 
    186 Files, pipes, sockets, and other streaming sources of data are handled
    187 by this method.
    188 """
--> 190 return self._parse(stream, Container())

File ~/miniconda3/envs/py3114/lib/python3.11/site-packages/elftools/construct/core.py:647, in Struct._parse(self, stream, context)
    646 else:
--> 647     subobj = sc._parse(stream, context)
    648     if sc.name is not None:

File ~/miniconda3/envs/py3114/lib/python3.11/site-packages/elftools/construct/core.py:353, in FormatField._parse(self, stream, context)
    352 except Exception as ex:
--> 353     raise FieldError(ex)

FieldError: expected 4, found 0

During handling of the above exception, another exception occurred:

ELFParseError                             Traceback (most recent call last)
Cell In[34], line 2
      1 eof = 0
----> 2 for i,seg in enumerate(elf.iter_segments()):
      3     print(i, seg.header.p_offset, seg.header.p_filesz)
      4     if seg.header.p_offset + seg.header.p_filesz > eof:

File ~/miniconda3/envs/py3114/lib/python3.11/site-packages/elftools/elf/elffile.py:207, in ELFFile.iter_segments(self, type)
    200 """ Yield all the segments in the file. If the optional |type|
    201     parameter is passed, this method will only yield segments of the
    202     given type. The parameter value must be a string containing the
    203     name of the type as defined in the ELF specification, e.g.
    204     'PT_LOAD'.
    205 """
    206 for i in range(self.num_segments()):
--> 207     segment = self.get_segment(i)
    208     if type is None or segment['p_type'] == type:
    209         yield segment

File ~/miniconda3/envs/py3114/lib/python3.11/site-packages/elftools/elf/elffile.py:197, in ELFFile.get_segment(self, n)
    194 """ Get the segment at index #n from the file (Segment object)
    195 """
    196 segment_header = self._get_segment_header(n)
--> 197 return self._make_segment(segment_header)

File ~/miniconda3/envs/py3114/lib/python3.11/site-packages/elftools/elf/elffile.py:604, in ELFFile._make_segment(self, segment_header)
    602     return InterpSegment(segment_header, self.stream)
    603 elif segtype == 'PT_DYNAMIC':
--> 604     return DynamicSegment(segment_header, self.stream, self)
    605 elif segtype == 'PT_NOTE':
    606     return NoteSegment(segment_header, self.stream, self)

File ~/miniconda3/envs/py3114/lib/python3.11/site-packages/elftools/elf/dynamic.py:247, in DynamicSegment.__init__(self, header, stream, elffile)
    239 def __init__(self, header, stream, elffile):
    240     # The string table section to be used to resolve string names in
    241     # the dynamic tag array is the one pointed at by the sh_link field
   (...)
    244     # segment, we do so by searching for the dynamic section whose content
    245     # is located at the same offset as the dynamic segment
    246     stringtable = None
--> 247     for section in elffile.iter_sections():
    248         if (isinstance(section, DynamicSection) and
    249                 section['sh_offset'] == header['p_offset']):
    250             stringtable = elffile.get_section(section['sh_link'])

File ~/miniconda3/envs/py3114/lib/python3.11/site-packages/elftools/elf/elffile.py:174, in ELFFile.iter_sections(self, type)
    167 """ Yield all the sections in the file. If the optional |type|
    168     parameter is passed, this method will only yield sections of the
    169     given type. The parameter value must be a string containing the
    170     name of the type as defined in the ELF specification, e.g.
    171     'SHT_SYMTAB'.
    172 """
    173 for i in range(self.num_sections()):
--> 174     section = self.get_section(i)
    175     if type is None or section['sh_type'] == type:
    176         yield section

File ~/miniconda3/envs/py3114/lib/python3.11/site-packages/elftools/elf/elffile.py:141, in ELFFile.get_section(self, n)
    137 """ Get the section at index #n from the file (Section object or a
    138     subclass)
    139 """
    140 section_header = self._get_section_header(n)
--> 141 return self._make_section(section_header)

File ~/miniconda3/envs/py3114/lib/python3.11/site-packages/elftools/elf/elffile.py:666, in ELFFile._make_section(self, section_header)
    664     return ARMAttributesSection(section_header, name, self)
    665 elif sectype == 'SHT_HASH':
--> 666     return self._make_elf_hash_section(section_header, name)
    667 elif sectype == 'SHT_GNU_HASH':
    668     return self._make_gnu_hash_section(section_header, name)

File ~/miniconda3/envs/py3114/lib/python3.11/site-packages/elftools/elf/elffile.py:740, in ELFFile._make_elf_hash_section(self, section_header, name)
    738 linked_symtab_index = section_header['sh_link']
    739 symtab_section = self.get_section(linked_symtab_index)
--> 740 return ELFHashSection(
    741     section_header, name, self, symtab_section
    742 )

File ~/miniconda3/envs/py3114/lib/python3.11/site-packages/elftools/elf/hash.py:80, in ELFHashSection.__init__(self, header, name, elffile, symboltable)
     78 def __init__(self, header, name, elffile, symboltable):
     79     Section.__init__(self, header, name, elffile)
---> 80     ELFHashTable.__init__(self, elffile, self['sh_offset'], symboltable)

File ~/miniconda3/envs/py3114/lib/python3.11/site-packages/elftools/elf/hash.py:33, in ELFHashTable.__init__(self, elffile, start_offset, symboltable)
     31 self.elffile = elffile
     32 self._symboltable = symboltable
---> 33 self.params = struct_parse(self.elffile.structs.Elf_Hash,
     34                            self.elffile.stream,
     35                            start_offset)

File ~/miniconda3/envs/py3114/lib/python3.11/site-packages/elftools/common/utils.py:43, in struct_parse(struct, stream, stream_pos)
     41     return struct.parse_stream(stream)
     42 except ConstructError as e:
---> 43     raise ELFParseError(str(e))

ELFParseError: expected 4, found 0