We generate mappings between random mathematical expressions their corresponding symbolic expressions.

License: MIT License

Python 97.42% Shell 0.10% C 2.48%

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math_to_symbexpr_map_generation's Issues

Type mismatch in generating C code

Some operators/functions are type-specified.

For example, the mod operator (%) takes only integer.
So x % fabs(y) will fail to be compiled. As demo in test_c_code_generation.test_generate_code_mod_func.

Handling Multiple Paths in a Function

A function with multiple paths will result in multiple dead ended states after symbolic execution.
Each of these will have its own return value.
At the moment, we combine these into a claripy.Or operation (here) and take this as the symbolic return expression of the function.

In retrospect, I don't think this makes sense.
One possible alternative approach is that we create multiple ExtractedSymExpr objects (one per return state) and return all of these for SymbolicExpressionExtractor.extract.

However, since SymbolicExpressionExtractor.extract is a pretty central part to the project, we may want to think what the best way forward is.

Symbolic Execution on Math Library Functions

In order to perform symbolic execution on functions included from math.h, we need to load these functions into the binary we are analyzing. One way to do this is to set auto_load_libs=True in the Project constructor of angr.
However, this appears to trigger a KeyError exception when performing calling convention analysis.
I attached a minimal working example to reproduce the error:
files.zip
(runs about 3 minutes)

The stacktrace follows below:

Traceback (most recent call last):
  File "analyze.py", line 8, in <module>
    main()
  File "analyze.py", line 5, in main
    proj.analyses.CompleteCallingConventions(analyze_callsites=True)
  File "/home/user/.virtualenvs/angr/lib/python3.6/site-packages/angr/analyses/analysis.py", line 115, in __call__
    oself.__init__(*args, **kwargs)
  File "/home/user/.virtualenvs/angr/lib/python3.6/site-packages/angr/analyses/complete_calling_conventions.py", line 22, in __init__
    self._analyze()
  File "/home/user/.virtualenvs/angr/lib/python3.6/site-packages/angr/analyses/complete_calling_conventions.py", line 52, in _analyze
    analyze_callsites=self._analyze_callsites)
  File "/home/user/.virtualenvs/angr/lib/python3.6/site-packages/angr/analyses/analysis.py", line 115, in __call__
    oself.__init__(*args, **kwargs)
  File "/home/user/.virtualenvs/angr/lib/python3.6/site-packages/angr/analyses/calling_convention.py", line 60, in __init__
    self._analyze()
  File "/home/user/.virtualenvs/angr/lib/python3.6/site-packages/angr/analyses/calling_convention.py", line 79, in _analyze
    callsite_facts = self._analyze_callsites()
  File "/home/user/.virtualenvs/angr/lib/python3.6/site-packages/angr/analyses/calling_convention.py", line 185, in _analyze_callsites
    rda_model: Optional[ReachingDefinitionsModel] = self.kb.defs.get_model(caller.addr)
  File "/home/user/.virtualenvs/angr/lib/python3.6/site-packages/angr/knowledge_plugins/key_definitions/key_definition_manager.py", line 67, in get_model
    observe_callback=observer.rda_observe_callback)
  File "/home/user/.virtualenvs/angr/lib/python3.6/site-packages/angr/analyses/analysis.py", line 115, in __call__
    oself.__init__(*args, **kwargs)
  File "/home/user/.virtualenvs/angr/lib/python3.6/site-packages/angr/analyses/reaching_definitions/reaching_definitions.py", line 138, in __init__
    self._analyze()
  File "/home/user/.virtualenvs/angr/lib/python3.6/site-packages/angr/analyses/forward_analysis/forward_analysis.py", line 221, in _analyze
    self._analysis_core_graph()
  File "/home/user/.virtualenvs/angr/lib/python3.6/site-packages/angr/analyses/forward_analysis/forward_analysis.py", line 240, in _analysis_core_graph
    changed, output_state = self._run_on_node(n, job_state)
  File "/home/user/.virtualenvs/angr/lib/python3.6/site-packages/angr/analyses/reaching_definitions/reaching_definitions.py", line 339, in _run_on_node
    dep_graph=self._dep_graph,
  File "/home/user/.virtualenvs/angr/lib/python3.6/site-packages/angr/analyses/reaching_definitions/engine_vex.py", line 56, in process
    block=kwargs.pop('block', None),
  File "/home/user/.virtualenvs/angr/lib/python3.6/site-packages/angr/engines/light/engine.py", line 87, in _process
    self._process_Stmt(whitelist=whitelist)
  File "/home/user/.virtualenvs/angr/lib/python3.6/site-packages/angr/engines/light/engine.py", line 108, in _process_Stmt
    self._handle_Stmt(stmt)
  File "/home/user/.virtualenvs/angr/lib/python3.6/site-packages/angr/analyses/reaching_definitions/engine_vex.py", line 96, in _handle_Stmt
    super(SimEngineRDVEX, self)._handle_Stmt(stmt)
  File "/home/user/.virtualenvs/angr/lib/python3.6/site-packages/angr/engines/light/engine.py", line 136, in _handle_Stmt
    getattr(self, handler)(stmt)
  File "/home/user/.virtualenvs/angr/lib/python3.6/site-packages/angr/analyses/reaching_definitions/engine_vex.py", line 102, in _handle_WrTmp
    super()._handle_WrTmp(stmt)
  File "/home/user/.virtualenvs/angr/lib/python3.6/site-packages/angr/engines/light/engine.py", line 142, in _handle_WrTmp
    data = self._expr(stmt.data)
  File "/home/user/.virtualenvs/angr/lib/python3.6/site-packages/angr/analyses/reaching_definitions/engine_vex.py", line 257, in _expr
    data = super()._expr(expr)
  File "/home/user/.virtualenvs/angr/lib/python3.6/site-packages/angr/engines/light/engine.py", line 174, in _expr
    return getattr(self, handler)(expr)
  File "/home/user/.virtualenvs/angr/lib/python3.6/site-packages/angr/engines/light/engine.py", line 228, in _handle_Unop
    return getattr(self, handler)(expr)
  File "/home/user/.virtualenvs/angr/lib/python3.6/site-packages/angr/analyses/reaching_definitions/engine_vex.py", line 382, in _handle_Conversion
    arg_0 = self._expr(expr.args[0])
  File "/home/user/.virtualenvs/angr/lib/python3.6/site-packages/angr/analyses/reaching_definitions/engine_vex.py", line 257, in _expr
    data = super()._expr(expr)
  File "/home/user/.virtualenvs/angr/lib/python3.6/site-packages/angr/engines/light/engine.py", line 174, in _expr
    return getattr(self, handler)(expr)
  File "/home/user/.virtualenvs/angr/lib/python3.6/site-packages/angr/analyses/reaching_definitions/engine_vex.py", line 266, in _handle_RdTmp
    self.state.add_use(Tmp(tmp, expr.result_size(self.tyenv) // self.arch.byte_width), self._codeloc())
  File "/home/user/.virtualenvs/angr/lib/python3.6/site-packages/angr/analyses/reaching_definitions/rd_state.py", line 291, in add_use
    self.codeloc_uses.update(self.get_definitions(atom))
  File "/home/user/.virtualenvs/angr/lib/python3.6/site-packages/angr/analyses/reaching_definitions/rd_state.py", line 302, in get_definitions
    return self.live_definitions.get_definitions(atom)
  File "/home/user/.virtualenvs/angr/lib/python3.6/site-packages/angr/knowledge_plugins/key_definitions/live_definitions.py", line 201, in get_definitions
    return self.tmp_definitions[atom.tmp_idx]
KeyError: 10

Deprecated Method Use

The AngrObjectFactory no longer supports the cc_from_arg_kinds method.

We use this function at least here, here, and here.

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