Function _get_bss

src/pystack/maps.py:194–234

(elf_maps: List[VirtualMap], load_point: int)

def _get_bss(elf_maps: List[VirtualMap], load_point: int) -> Optional[VirtualMap]:
    binary_map = _get_base_map(elf_maps)
    if not binary_map or not binary_map.path:
        return None
    try:
        from ._pystack import get_bss_info
    except ImportError:  # pragma: no cover
        return None
    bss_info = get_bss_info(binary_map.path)
    if not bss_info:
        return None
    start = load_point + bss_info["corrected_addr"]
    LOGGER.info(
        "Determined exact addr of .bss section: %s (%s + %s)",
        hex(start),
        hex(load_point),
        hex(bss_info["corrected_addr"]),
    )
    offset = 0

    # Calculate the offset based on the mapped files. The offset in core files
    # is only present in the core (and not in the original ELF) so this
    # operation allows us to correlate the bss section with some memory location
    # within the core file.
    first_matching_map = next((map for map in elf_maps if map.contains(start)), None)
    if first_matching_map is None:
        return None

    offset = first_matching_map.offset + (start - first_matching_map.start)

    bss = VirtualMap(
        start=start,
        end=start + bss_info["size"],
        filesize=bss_info["size"],
        offset=offset,
        device="",
        flags="",
        inode=0,
        path=None,
    )
    return bss


def parse_maps_file_for_binary(