62 lines
2.4 KiB
Python
62 lines
2.4 KiB
Python
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#-------------------------------------------------------------------------------
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# elftools: elf/notes.py
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#
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# ELF notes
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#
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# Eli Bendersky (eliben@gmail.com)
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# This code is in the public domain
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#-------------------------------------------------------------------------------
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from ..common.utils import struct_parse, bytes2hex, roundup, bytes2str
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from ..construct import CString
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def iter_notes(elffile, offset, size):
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""" Yield all the notes in a section or segment.
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"""
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end = offset + size
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while offset < end:
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note = struct_parse(
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elffile.structs.Elf_Nhdr,
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elffile.stream,
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stream_pos=offset)
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note['n_offset'] = offset
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offset += elffile.structs.Elf_Nhdr.sizeof()
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elffile.stream.seek(offset)
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# n_namesz is 4-byte aligned.
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disk_namesz = roundup(note['n_namesz'], 2)
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note['n_name'] = bytes2str(
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CString('').parse(elffile.stream.read(disk_namesz)))
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offset += disk_namesz
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desc_data = elffile.stream.read(note['n_descsz'])
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note['n_descdata'] = desc_data
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if note['n_type'] == 'NT_GNU_ABI_TAG':
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note['n_desc'] = struct_parse(elffile.structs.Elf_abi,
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elffile.stream,
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offset)
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elif note['n_type'] == 'NT_GNU_BUILD_ID':
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note['n_desc'] = bytes2hex(desc_data)
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elif note['n_type'] == 'NT_GNU_GOLD_VERSION':
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note['n_desc'] = bytes2str(desc_data)
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elif note['n_type'] == 'NT_PRPSINFO':
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note['n_desc'] = struct_parse(elffile.structs.Elf_Prpsinfo,
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elffile.stream,
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offset)
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elif note['n_type'] == 'NT_FILE':
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note['n_desc'] = struct_parse(elffile.structs.Elf_Nt_File,
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elffile.stream,
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offset)
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elif note['n_type'] == 'NT_GNU_PROPERTY_TYPE_0':
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off = offset
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props = []
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while off < end:
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p = struct_parse(elffile.structs.Elf_Prop, elffile.stream, off)
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off += roundup(p.pr_datasz + 8, 2 if elffile.elfclass == 32 else 3)
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props.append(p)
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note['n_desc'] = props
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else:
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note['n_desc'] = desc_data
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offset += roundup(note['n_descsz'], 2)
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note['n_size'] = offset - note['n_offset']
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yield note
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