List symbols & their CRCs in a Linux kernel module file

modversions.py

#!/usr/bin/env python3
import sys
import subprocess
import tempfile
import struct


def get_modversions(module):
    with tempfile.NamedTemporaryFile("rb") as tf:
        subprocess.check_call(["objcopy", "-O", "binary", "--only-section=__versions", module, tf.name])
        versions = tf.read()

    for b in [versions[i:i+64] for i in range(0, len(versions), 64)]:
        # struct modversion_info
        crc, sym = struct.unpack("L56s", b)
        yield sym.rstrip(b'\x00').decode(), crc


def main(argv):
    if len(argv) != 2:
        print("usage: {} module".format(argv[0]))

    for symbol, crc in get_modversions(argv[1]):
        print("{:30s} 0x{:08x}".format(symbol, crc))


if __name__ == "__main__":
    main(sys.argv)