When you want the decompilation (and symbols) displayed for a section of memory which is not the main binary, like when debugging a shared library, you need to do some extra steps. It may be unmapped or remapped to another value. Note: $v4 in this case will only be mapped for as long as you are in the same function. This also works with function arguments if applicable (mileage may vary): p $a1 To see what value is actually in that stack variable, Stack variables will always store their address on the stack. You can see their contents like a normal GDB convenience To the stack or registers, we import them as convenience variables. Some variables that are stored locally in a function are stack variables. This means normal GDB commands like printing and examination are native: b sub_46340 Functions and Global Varsįunctions and Global Vars from your decompilation are now mapped into your GDB like normal Source-level On each breakpoint event, you will now see decompilation printed, and the line you are on associated with You want source for, then you should take a look at the Advanced Usage - Shared Libs section the main binary your debugger attached to is not the binary If you are using decomp2dbg for a library, i.e. If all is well, you should see: Connected to decompiler! The first connection can take up to 30 seconds to register depending on the amount of globals in the binary. You can find out how to use all the commands by running the decompiler command with the -help flag. Here is an example: decompiler connect ida -host 10.211.55.2 -port 3662 If you are running the decompiler on a VM or different machine, you can optionally provide the host and Next, in your debugger, run: decompiler connect See a message in your decompiler Starting XMLRPC server: localhost:3662 Or selecting the decomp2dbg: configure tab in your associated plugins tab. After normal analysis, this can be done by using the hotkey Ctrl-Shift-D, Until your decompiler finishes its normal analysis before starting it. & \Ĭp d2d.py ~/.d2d.py & echo "source ~/.d2d.py" > ~/.gdbinitįirst, start the decompilation server on your decompiler. If you also need to install the gdb side of things, use the line below: pip3 install. decompilers/d2d_ida/* /path/to/ida/plugins/ decompilers/d2d_ida/ into your ida plugins folder: cp -r. Here is how you do it in IDA:Ĭopy all the files in. If you only need the decompiler side of things, copy the associated decompiler plugin to theĭecompiler's plugin folder. If you can't use the above built-in script (non-WSL Windows install for the decompiler), follow the steps below: Skip this if you were able to use the above install with no errors. If you are installing decomp2dbg with GEF or pwndbg it's important that in your ~/.gdbinit theĭ2d.py file is sourced after GEF or pwndbg. Note: You may need to allow inbound connections on port 3662, or the port you use, for decomp2dbg to connect If you installed the decompiler-side in the Binja Plugin Manager, you still need to install the debugger side with the above. You must follow the extra steps to enable extensions here. This will open a prompt where you be asked to input the path to your decompiler and debugger of choice. Install through pip, then use the built-in installer for decompilers: pip3 install decomp2dbg & decomp2dbg -install Interested in seeing what decomp2dbg looks like in practice? Checkout the recorded talk at CactusCon 2023,įeaturing debugging a remote arm32 binary from a 圆4 machine with Ghidra symbols.įor active help, join the BinSync Discord below, where we answer decomp2dbg questions: The symbols and decompilation lines they recover in their decompiler. In effect, giving the reverser the power of their debugger with In the case of reversing static binaries,Ĭontext switching between debugger assembly and the symbols you have reversed in decompilation can be inefficient.ĭecomp2dbg aims to shorten the gap of context switching between decompiler and debugger by introducing a genericĪPI for decompiler-to-debugger symbol syncing. Use these analyses without sharing knowledge between the two. Reverse engineering involves both static (decompiler) and dynamic (debugger) analysis, yet we often
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