iot - Extracting firmware with python (offset question)

Question

The Binwalk output of modified firmware

for some reason whenever I try to extract a firmware with the identified parts using python, I get so many additional xz compressed data.

Here's my code in the python script, where it is (name, offset, and size)

    FirmwarePart("uimage_kernel", 0x0, 0x40),
    FirmwarePart("lzma",0x40,0x18A143),
    FirmwarePart("squashfs", 0x18A143,0)

Binwalk output of original firmware

Here's the Binwalk output of the original firmware binary.

I have a feeling I'm not calculating the size of the last component "squashfs" correctly. Sorry if this is unclear, I'm new to all this.

The header added firmware binary file

question from:https://stackoverflow.com/questions/65910396/extracting-firmware-with-python-offset-question

Answer 1

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