load_from_dwarf with a non-PIC executable fails to correctly set low_pc and high_pc for dvars

[jornlp]

Description

I want to use dvars to retrieve the value of variables from my executable but this fails.
My executable is non-PIC I've cross_compiled on Mac using x86_64-linux-musl-gcc, so the base_addr should not be set.

state.dvars["myvar"] returns None even when it should return a value. It returns None as the address_range being checked (low_pc and high_pc) is not set correctly.

When running the following:

project.kb.dvars.load_from_dwarf()

the low_pc and high_pc are set incorrectly in debug_variables.py line 217:

low_pc = cle_var.lexical_block.low_pc + obj.mapped_base
high_pc = cle_var.lexical_block.high_pc + obj.mapped_base

I believe in this case either obj.mapped_base should be 0 or it should not be added to the low_pc/high_pc retrieved from dwarf info.

Steps to reproduce the bug

Compile a simple c file (e.g. example.c) with variables declared in a function using x86_64-linux-musl-gcc (it may be the case for any non-PIC executable).

Retrieve state.dvars["myvar"] after stepping into the function.

Environment

angr running on Mac on a cross-compiled binary:
using x86_64-linux-musl-gcc

Additional context

No response