Tailjmps to reloc targets are decompiled until infinity

[dmknght]

Linux Kernel Modules has no ret in functions. Rizin is able to detect them. However, the decompiler failed to parse data of each function, causing very long function in decompiler widget which is totally wrong, or causing decompile time out Step to reprocedure (with cutter)

1. Open kernel module (soundcore.ko in this very case)
2. Show the function sym.register_sound_dsp
3. See the wrong output in decompiler widget

Screenshots

1. List of functions
2. Function in Graph widget
3. Function in Decompiler widget

The function sym.register_sound_special is even worse

Click on the .text.unlikely makes Decompiler shows totally wrong function from function name

The output is the same in rizin -> the problem is the plugin ghidra

And other issue relates to #229. sym.register_sound_dsp showed function __fentry__ is called. However, Decompiler widget failed to show function name.

Tested binary issue312_ghidra_failed_to_detect_functions.zip

[thestr4ng3r]

Function names from reloc targets work now.

The __x86_return_thunk is handled in ghidra because it applies a flow override to the respective jmp instructions:

There are ways to address this in rizin/rz-ghidra too, but currently none that is trivial or straightforward. As a quick and dirty workaround for this bin, you can do e io.cache=1; wa ret @ reloc.target.__x86_return_thunk

[dmknght]

Hello! This method worked for me. Hope it will be fixed by default soon.