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lumping-sugar66 · 11-30-2023, 10:48 AM

So, more progress. I've had some success!

I wanted to triple-check the symbols availability on the device and change the nh.c to dump all the available symbols to a text file, and then I checked for the symbols from working mods vs. unsuccessful attempts of mine.

Sure enough, "_ZN11ReadingView19readerIsDoneLoadingEv" is on this list (nickelclock)

But, "_ZN20OverDriveActionProxy16setShowOverDriveEb " is not. Some of the other symbols I've tried are not there as well.

I ended up basing my search on this list instead of Ghidra and symdump results, and for this use case of forcing OverDrive, thankfully, there's a "_ZN20OverDriveCardManager18isOverDriveEnabled Ev". I hooked onto that and overridden the internal logic, and sure enough, the mod works with no hiccup.

So I'm not sure if it's the particular libnickel.so.1.0.0 that doesn't expose these symbols in some way or make them available to nickelhook, but I think I'll base my search for hookable symbols on that list and proceed with other tools to see the decompilation result, unless there's other suggestions.

FWIW, I'm sharing that list here: https://gist.github.com/onatbas/a203...0968ab9aee3db2

11-30-2023, 10:48 AM	#31
lumping-sugar66 Zealot Posts: 100 Karma: 81981 Join Date: Oct 2023 Location: Ontario, Canada Device: Kobo Aura Edition 2, Kobo Clara 2E	So, more progress. I've had some success! I wanted to triple-check the symbols availability on the device and change the nh.c to dump all the available symbols to a text file, and then I checked for the symbols from working mods vs. unsuccessful attempts of mine. Sure enough, "_ZN11ReadingView19readerIsDoneLoadingEv" is on this list (nickelclock) But, "_ZN20OverDriveActionProxy16setShowOverDriveEb " is not. Some of the other symbols I've tried are not there as well. I ended up basing my search on this list instead of Ghidra and symdump results, and for this use case of forcing OverDrive, thankfully, there's a "_ZN20OverDriveCardManager18isOverDriveEnabled Ev". I hooked onto that and overridden the internal logic, and sure enough, the mod works with no hiccup. So I'm not sure if it's the particular libnickel.so.1.0.0 that doesn't expose these symbols in some way or make them available to nickelhook, but I think I'll base my search for hookable symbols on that list and proceed with other tools to see the decompilation result, unless there's other suggestions. FWIW, I'm sharing that list here: https://gist.github.com/onatbas/a203...0968ab9aee3db2