MachO: Support for overlay

[prabhu]

Please describe what you would like to have in LIEF.
Binaries produced from dotnet have useful dependency dll information under the overlay.

For PE and ELF, we can access this attribute and retrieve the information. I am unable to find this attribute for MachO, so I was wondering if this is missing or if the information is available elsewhere.

Note: If the feature is not precise or if you want to have feedback first, you can open a discussion.

[romainthomas]

I'll take a look at this overlay support in Mach-O. Thank you @prabhu for raising this point.

[romainthomas]

Hi @prabhu
Do you have an example of Mach-O binary that would have an overlay?

[prabhu]

@romainthomas any dotnet executable can be used. Below are couple of binaries. Please feel free to use them for testing purposes.

https://github.com/owasp-dep-scan/dosai/releases/download/v0.1.1/Dosai-osx-arm64
https://github.com/owasp-dep-scan/dosai/releases/download/v0.1.1/Dosai-osx-x64

In addition to adding overlays, I would appreciate it if you could offer a convenient API to extract the information. Currently, my project does some hacks to extract the json.

Thank you in advance!