[GSoC] Ghidra firmware utilities, week 4

During the previous week, I worked on additional filesystem loaders to support parsing Flash Map (FMAP) images and the coreboot file system (CBFS). As of this week, these FS loaders are mostly complete, and can be used to import raw binaries within compiled coreboot ROMs. Support for CBFS file compression (with either LZMA or LZ4) is also implemented; compressed files will be automatically extracted. Here are some screenshots of the new FS loaders:

While these might not be the most useful FS loaders (as FMAP and CBFS are mainly used by coreboot itself), I gained additional familiarity with Ghidra’s plugin APIs for FS loaders. This will be useful, as I will be writing additional FS loaders for this project.

Plans for this week

I’ll continue to make minor changes to the existing FS loaders (various cleanups/etc). I’ll also start to write a FS loader for parsing ROMs with an Intel firmware descriptor (IFD), which shouldn’t be too complicated. After this is completed, I plan on writing a FS loader for UEFI firmware volumes (ideally similar to UEFITool or uefi-firmware-parser). I anticipate that this loader will be more complex, so I’ve reserved additional time to ensure its completion.