mirror of
https://github.com/cyber-defence-campus/mole
synced 2026-06-20 13:19:21 +00:00
28 incorrect slicing of function parameters (#30)
- Fixes issue #28. - Clear source's target instruction when reanalyzing a binary - Remove `is_definition` attribute - Added unit-tests
This commit is contained in:
Damian Pfammatter
@@ -178,6 +178,7 @@ class SourceFunction(Function):
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"""
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This method finds a set of target instructions that a static backward slice should hit on.
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"""
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self.target_insts.clear()
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code_refs = SymbolHelper.get_code_refs(
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bv,
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self.symbols,
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+90
-69
@@ -26,20 +26,16 @@ class MediumLevelILInstructionGraph(nx.DiGraph):
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def add_node(
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self,
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inst: bn.MediumLevelILInstruction,
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is_definition: bool = None,
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call_level: int = None,
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caller_site: bn.MediumLevelILFunction = None
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) -> None:
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"""
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This method adds a node for the given instruction `inst` with the following node attributes:
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The attribute `is_definition` should indicate whether or not instruction `inst` defines a
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SSA variable, i.e. represents an assigning instruction. The attribute `call_level` should
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indicate the `inst`'s level within the call stack. The attribute `caller_site` should
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indicate the function that called `inst.function`.
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The attribute `call_level` is expected to be `inst`'s level within the call stack. The
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attribute `caller_site` is expected to be the function that called `inst.function`.
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"""
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super().add_node(
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inst,
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is_definition=is_definition,
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call_level=call_level,
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caller_site=caller_site
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)
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@@ -47,27 +43,27 @@ class MediumLevelILInstructionGraph(nx.DiGraph):
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def add_edge(
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self,
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inst_from: bn.MediumLevelILInstruction,
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inst_to: bn.MediumLevelILInstruction
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from_inst: bn.MediumLevelILInstruction,
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to_inst: bn.MediumLevelILInstruction
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) -> None:
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"""
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This method adds an edge from `inst_from` to `inst_to`.
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This method adds an edge from `from_inst` to `to_inst`.
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"""
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if not inst_from in self.nodes:
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info = InstructionHelper.get_inst_info(inst_from)
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if not from_inst in self.nodes:
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info = InstructionHelper.get_inst_info(from_inst)
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self._log.warn(
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self._tag,
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f"Edge not added to instruction graph due to an inexisting from node ({info:s})"
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)
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return
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if not inst_to in self.nodes:
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info = InstructionHelper.get_inst_info(inst_to)
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if not to_inst in self.nodes:
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info = InstructionHelper.get_inst_info(to_inst)
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self._log.warn(
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self._tag,
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f"Edge not added to instruction graph due to an inexisting to node ({info:s})"
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)
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return
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super().add_edge(inst_from, inst_to)
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super().add_edge(from_inst, to_inst)
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return
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@@ -96,7 +92,7 @@ class MediumLevelILFunctionGraph(nx.DiGraph):
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) -> None:
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"""
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This method adds a node for the given `call_site`, with the following node attribute: The
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attribute `call_level` should indicate the `call_site`'s level within the call stack.
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attribute `call_level` is expected to be the `call_site`'s level within the call stack.
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"""
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super().add_node(
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call_site,
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@@ -106,27 +102,27 @@ class MediumLevelILFunctionGraph(nx.DiGraph):
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def add_edge(
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self,
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call_site_from: bn.MediumLevelILFunction,
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call_site_to: bn.MediumLevelILFunction,
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from_call_site: bn.MediumLevelILFunction,
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to_call_site: bn.MediumLevelILFunction,
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) -> None:
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"""
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This method adds an edge from `call_site_from` to `call_site_to`.
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This method adds an edge from `from_call_site` to `to_call_site`.
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"""
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if not call_site_from in self.nodes:
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info = FunctionHelper.get_func_info(call_site_from)
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if not from_call_site in self.nodes:
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info = FunctionHelper.get_func_info(from_call_site)
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self._log.warn(
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self._tag,
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f"Edge not added to function graph due to an inexisting from node ({info:s})"
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)
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return
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if not call_site_to in self.nodes:
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info = FunctionHelper.get_func_info(call_site_to)
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if not to_call_site in self.nodes:
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info = FunctionHelper.get_func_info(to_call_site)
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self._log.warn(
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self._tag,
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f"Edge not added to function graph due to an inexisting to node ({info:s})"
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)
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return
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super().add_edge(call_site_from, call_site_to)
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super().add_edge(from_call_site, to_call_site)
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return
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@@ -162,42 +158,46 @@ class MediumLevelILBackwardSlicer:
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caller_site: bn.MediumLevelILFunction = None
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) -> None:
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"""
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This method first tries to find the instruction defining variable `ssa_var` within `inst`'s
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function. If it is found, slicing proceeds at the identified defining instruction. If no
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defining instruction is found, it is checked whether `ssa_var` belongs to a function
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argument, and if so, defining instructions are searched within the callers (only if we go
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down the call stack). Slicing then proceeds in all found defining instructions.
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This method first tries to find the instruction defining variable `ssa_var` within
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`inst.function`. If it is found, slicing proceeds at the identified defining instruction. If
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no defining instruction is found, the method distinguishes whether we went up
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(caller_level <= call_level) or down (caller_level > call_level) the call stack. If we went
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up, we know from which caller we came from and can proceed only this single caller site. If
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we went down, we don't know this and need to follow all caller sites.
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"""
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# Try finding the definition withing the current function
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inst_def = inst.function.get_ssa_var_definition(ssa_var)
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if inst_def:
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self._inst_graph.add_node(inst, False, call_level, caller_site)
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self._inst_graph.add_node(inst_def, True, call_level, caller_site)
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self._inst_graph.add_node(inst, call_level, caller_site)
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self._inst_graph.add_node(inst_def, call_level, caller_site)
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self._inst_graph.add_edge(inst, inst_def)
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self._slice_backwards(inst_def, call_level, caller_site)
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return
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# Try finding the definition in another function if we go down the call stack
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# Try finding the definition in another function
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if abs(call_level) > self._max_call_level and self._max_call_level >= 0: return
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caller_site_level = self._call_graph.nodes.get(caller_site, {}).get("call_level", None)
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if caller_site_level is None or call_level < caller_site_level:
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caller_level = self._call_graph.nodes.get(caller_site, {}).get("call_level", None)
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for parm_idx, parm_var in enumerate(inst.function.source_function.parameter_vars):
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if parm_var != ssa_var.var: continue
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for cs in inst.function.source_function.caller_sites:
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try:
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inst_caller: bn.MediumLevelILInstruction = cs.mlil.ssa_form
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parm_caller: bn.MediumLevelILInstruction = inst_caller.params[parm_idx]
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func_caller: bn.MediumLevelILFunction = parm_caller.function
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cs_inst = cs.mlil.ssa_form
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cs_parm = cs_inst.params[parm_idx]
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# Visit specific caller site if we go up the call stack (all caller sites otherwise)
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if not caller_level is None and caller_level <= call_level:
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if caller_site != cs_inst.function:
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continue
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cs_info = InstructionHelper.get_inst_info(cs_inst, False)
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self._log.debug(
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self._tag,
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f"[{call_level:+d}] Follow '{ssa_var.name}#{ssa_var.version}' to caller '0x{inst_caller.address:x}: {str(inst_caller):s}'"
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f"Follow parameter '{ssa_var.name}#{ssa_var.version}' to caller '{cs_info:s}'"
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)
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self._inst_graph.add_node(inst, False, call_level, caller_site)
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self._inst_graph.add_node(parm_caller, False, call_level-1, inst.function)
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self._inst_graph.add_edge(inst, parm_caller)
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self._inst_graph.add_node(inst, call_level, caller_site)
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self._inst_graph.add_node(cs_parm, call_level-1, inst.function)
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self._inst_graph.add_edge(inst, cs_parm)
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self._call_graph.add_node(cs_inst.function, call_level-1)
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self._call_graph.add_node(inst.function, call_level)
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self._call_graph.add_node(func_caller, call_level-1)
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self._call_graph.add_edge(inst.function, func_caller)
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self._slice_backwards(parm_caller, call_level-1, inst.function)
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self._call_graph.add_edge(cs_inst.function, inst.function)
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self._slice_backwards(cs_parm, call_level-1, inst.function)
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except:
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continue
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return
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@@ -209,7 +209,9 @@ class MediumLevelILBackwardSlicer:
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caller_site: bn.MediumLevelILFunction = None
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) -> None:
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"""
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This method backward slices instruction `inst` based on its type.
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This method backward slices instruction `inst` based on its type. Parameter `call_level` is
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expected to be `inst`'s level within the call stack. Parameter `caller_site` is expected to
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be the function that called `inst.function`.
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"""
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info = InstructionHelper.get_inst_info(inst)
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# Instruction sliced before
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@@ -248,8 +250,8 @@ class MediumLevelILBackwardSlicer:
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bn.MediumLevelILLowPart() |
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bn.MediumLevelILFneg() |
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bn.MediumLevelILFloatConv()):
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self._inst_graph.add_node(inst, False, call_level, caller_site)
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self._inst_graph.add_node(inst.src, None, call_level, caller_site)
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self._inst_graph.add_node(inst, call_level, caller_site)
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self._inst_graph.add_node(inst.src, call_level, caller_site)
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self._inst_graph.add_edge(inst, inst.src)
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self._slice_backwards(inst.src, call_level, caller_site)
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case (bn.MediumLevelILAdd() |
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@@ -274,18 +276,18 @@ class MediumLevelILBackwardSlicer:
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bn.MediumLevelILFsub() |
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bn.MediumLevelILFmul() |
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bn.MediumLevelILFdiv()):
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self._inst_graph.add_node(inst, False, call_level, caller_site)
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self._inst_graph.add_node(inst.left, None, call_level, caller_site)
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self._inst_graph.add_node(inst, call_level, caller_site)
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self._inst_graph.add_node(inst.left, call_level, caller_site)
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self._inst_graph.add_edge(inst, inst.left)
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self._slice_backwards(inst.left, call_level, caller_site)
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self._inst_graph.add_node(inst, False, call_level, caller_site)
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self._inst_graph.add_node(inst.right, None, call_level, caller_site)
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self._inst_graph.add_node(inst, call_level, caller_site)
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self._inst_graph.add_node(inst.right, call_level, caller_site)
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self._inst_graph.add_edge(inst, inst.right)
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self._slice_backwards(inst.right, call_level, caller_site)
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case (bn.MediumLevelILRet()):
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for ret in inst.src:
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self._inst_graph.add_node(inst, False, call_level, caller_site)
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self._inst_graph.add_node(ret, None, call_level, caller_site)
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self._inst_graph.add_node(inst, call_level, caller_site)
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self._inst_graph.add_node(ret, call_level, caller_site)
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self._inst_graph.add_edge(inst, ret)
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self._slice_backwards(ret, call_level, caller_site)
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case (bn.MediumLevelILSetVarSsa() |
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@@ -293,8 +295,8 @@ class MediumLevelILBackwardSlicer:
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bn.MediumLevelILSetVarAliasedField() |
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bn.MediumLevelILSetVarSsaField() |
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bn.MediumLevelILSetVarSplitSsa()):
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self._inst_graph.add_node(inst, True, call_level, caller_site)
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self._inst_graph.add_node(inst.src, None, call_level, caller_site)
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self._inst_graph.add_node(inst, call_level, caller_site)
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self._inst_graph.add_node(inst.src, call_level, caller_site)
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self._inst_graph.add_edge(inst, inst.src)
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self._slice_backwards(inst.src, call_level, caller_site)
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case (bn.MediumLevelILVarPhi()):
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@@ -306,45 +308,64 @@ class MediumLevelILBackwardSlicer:
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match dest_inst:
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case (bn.MediumLevelILConstPtr(constant=func_addr) |
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bn.MediumLevelILImport(constant=func_addr)):
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# Backward slice into functions defined within the binary
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try:
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func = self._bv.get_function_at(func_addr).mlil.ssa_form
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func_info = FunctionHelper.get_func_info(func, False)
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symb = func.source_function.symbol
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for func_inst in func.instructions:
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match func_inst:
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# TODO: Support all return instructions
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# Backward slice starting from possible return instructions
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match func_inst:
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case (bn.MediumLevelILRet() |
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bn.MediumLevelILTailcallSsa()):
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if (
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self._max_call_level < 0 or
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(self._max_call_level != 0 and abs(call_level) < self._max_call_level)
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(
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abs(call_level) < self._max_call_level and
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self._max_call_level != 0
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)
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):
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self._inst_graph.add_node(inst, True, call_level, caller_site)
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self._inst_graph.add_node(func_inst, None, call_level+1, inst.function)
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# Function
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if symb.type == bn.SymbolType.FunctionSymbol:
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ret_info = InstructionHelper.get_inst_info(func_inst, False)
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self._log.debug(
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self._tag,
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f"Follow return instruction '{ret_info:s}' of function '{func_info:s}'"
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)
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self._inst_graph.add_node(inst, call_level, caller_site)
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self._inst_graph.add_node(func_inst, call_level+1, inst.function)
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self._inst_graph.add_edge(inst, func_inst)
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self._call_graph.add_node(inst.function, call_level)
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self._call_graph.add_node(func, call_level+1)
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self._call_graph.add_edge(inst.function, func)
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self._slice_backwards(func_inst, call_level+1, inst.function)
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# Imported function
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elif symb.type == bn.SymbolType.ImportedFunctionSymbol:
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for par in inst.params:
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par_info = InstructionHelper.get_inst_info(par, False)
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self._log.debug(
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self._tag,
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f"Follow parameter '{par_info:s}' of imported function '{func_info:s}'"
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)
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self._inst_graph.add_node(inst, call_level, caller_site)
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self._inst_graph.add_node(par, call_level, caller_site)
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self._inst_graph.add_edge(inst, par)
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self._slice_backwards(par, call_level, caller_site)
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else:
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self._log.warn(self._tag, f"Function '{func_info:s}' has an uexpected type '{str(symb.type):s}'")
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else:
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self._log.debug(
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self._tag,
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f"[{call_level:+d}] {dest_info:s}: Maximum function depth {self._max_call_level:d} reached"
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f"[{call_level:+d}] {dest_info:s}: Maximum call level {self._max_call_level:d} reached"
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)
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except:
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# Function not found within the binary
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pass
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case _:
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self._log.warn(self._tag, f"[{call_level:+d}] {dest_info:s}: Missing handler")
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# Backward slice function parameters
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for par in inst.params:
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self._inst_graph.add_node(inst, True, call_level, caller_site)
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self._inst_graph.add_node(par, None, call_level, caller_site)
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self._inst_graph.add_edge(inst, par)
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self._slice_backwards(par, call_level, caller_site)
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case (bn.MediumLevelILSyscallSsa()):
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for par in inst.params:
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self._inst_graph.add_node(inst, False, call_level, caller_site)
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self._inst_graph.add_node(par, None, call_level, caller_site)
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self._inst_graph.add_node(inst, call_level, caller_site)
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self._inst_graph.add_node(par, call_level, caller_site)
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self._inst_graph.add_edge(inst, par)
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self._slice_backwards(par, call_level, caller_site)
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case _:
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@@ -0,0 +1,28 @@
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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/*
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Testcase Description:
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- allow function inlining
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- do not follow all function parameters blindly (positive)
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*/
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char* func(char* env) {
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size_t len = strlen(env);
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char *cmd = (char *) malloc(len+1);
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for(int i = 0; i<len; i++) {
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cmd[i] = env[i];
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}
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cmd[len] = '\0';
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fprintf(stdout, "env: '%s'\ncmd: '%s'\n", env, cmd);
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return cmd;
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}
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int main(int argc, char *argv[]) {
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char *env, *cmd;
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env = getenv("CMD");
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cmd = func(env);
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system(cmd);
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return EXIT_SUCCESS;
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}
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@@ -0,0 +1,29 @@
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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/*
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Testcase Description:
|
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- disallow function inlining
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- do not follow all function parameters blindly (positive)
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*/
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__attribute__ ((noinline))
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char* func(char* env) {
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size_t len = strlen(env);
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char *cmd = (char *) malloc(len+1);
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for(int i = 0; i<len; i++) {
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cmd[i] = env[i];
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}
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cmd[len] = '\0';
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fprintf(stdout, "env: '%s'\ncmd: '%s'\n", env, cmd);
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return cmd;
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}
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int main(int argc, char *argv[]) {
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char *env, *cmd;
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env = getenv("CMD");
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cmd = func(env);
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system(cmd);
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return EXIT_SUCCESS;
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}
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@@ -0,0 +1,28 @@
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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|
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/*
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Testcase Description:
|
||||
- allow function inlining
|
||||
- do not follow all function parameters blindly (negative)
|
||||
*/
|
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|
||||
char* func(char* env) {
|
||||
char *cmd = (char *) malloc(4);
|
||||
cmd[0] = 'l';
|
||||
cmd[1] = 's';
|
||||
cmd[2] = '\0';
|
||||
cmd[3] = '\0';
|
||||
fprintf(stdout, "--- FUN ---\n");
|
||||
fprintf(stdout, "env: '%s'\ncmd: '%s'\n", env, cmd);
|
||||
return cmd;
|
||||
}
|
||||
|
||||
int main(int argc, char *argv[]) {
|
||||
char *env, *cmd;
|
||||
env = getenv("CMD");
|
||||
cmd = func(env);
|
||||
system(cmd);
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
@@ -0,0 +1,29 @@
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
|
||||
/*
|
||||
Testcase Description:
|
||||
- disallow function inlining
|
||||
- do not follow all function parameters blindly (negative)
|
||||
*/
|
||||
|
||||
__attribute__ ((noinline))
|
||||
char* func(char* env) {
|
||||
char *cmd = (char *) malloc(4);
|
||||
cmd[0] = 'l';
|
||||
cmd[1] = 's';
|
||||
cmd[2] = '\0';
|
||||
cmd[3] = '\0';
|
||||
fprintf(stdout, "--- FUN ---\n");
|
||||
fprintf(stdout, "env: '%s'\ncmd: '%s'\n", env, cmd);
|
||||
return cmd;
|
||||
}
|
||||
|
||||
int main(int argc, char *argv[]) {
|
||||
char *env, *cmd;
|
||||
env = getenv("CMD");
|
||||
cmd = func(env);
|
||||
system(cmd);
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
@@ -295,6 +295,81 @@ class TestFunctionCalling(TestCase):
|
||||
self.test_02(filenames)
|
||||
return
|
||||
|
||||
def test_05(
|
||||
self,
|
||||
filenames: List[str] = ["function_calling-05"]
|
||||
) -> None:
|
||||
for file in load_files(filenames):
|
||||
# Load and analyze test binary with Binary Ninja
|
||||
bv = bn.load(file)
|
||||
bv.update_analysis_and_wait()
|
||||
# Analyze test binary
|
||||
paths = self.ctr.analyze_binary(bv, max_call_level=3, enable_all_funs=True)
|
||||
# Assert results
|
||||
self.assertTrue(len(paths) == 1, "1 path identified")
|
||||
path = paths[0]
|
||||
self.assertIn(path.src_sym_name, ["getenv"], "source has symbol 'getenv'")
|
||||
self.assertTrue(
|
||||
isinstance(path.insts[-1], bn.MediumLevelILInstruction),
|
||||
"source is a MLIL instruction"
|
||||
)
|
||||
self.assertIn(path.snk_sym_name, ["system"], "sink has symbol 'system'")
|
||||
self.assertTrue(
|
||||
(
|
||||
isinstance(path.insts[0], bn.MediumLevelILCallSsa) or
|
||||
isinstance(path.insts[0], bn.MediumLevelILTailcallSsa)
|
||||
),
|
||||
"sink is a MLIL call instruction"
|
||||
)
|
||||
self.assertEqual(path.snk_par_idx, 0, "arg1")
|
||||
self.assertTrue(
|
||||
isinstance(path.snk_par_var, bn.MediumLevelILVarSsa),
|
||||
"argument is a MLIL variable"
|
||||
)
|
||||
calls = [path.snk_sym_name]
|
||||
for inst in path.insts:
|
||||
call = inst.function.source_function.name
|
||||
if calls[-1] != call:
|
||||
calls.append(call)
|
||||
calls.append(path.src_sym_name)
|
||||
self.assertEqual(
|
||||
calls,
|
||||
["system", "main", "func", "main", "getenv"]
|
||||
)
|
||||
# Close test binary
|
||||
bv.file.close()
|
||||
return
|
||||
|
||||
def test_06(
|
||||
self,
|
||||
filenames: List[str] = ["function_calling-06"]
|
||||
) -> None:
|
||||
self.test_05(filenames)
|
||||
return
|
||||
|
||||
def test_07(
|
||||
self,
|
||||
filenames: List[str] = ["function_calling-07"]
|
||||
) -> None:
|
||||
for file in load_files(filenames):
|
||||
# Load and analyze test binary with Binary Ninja
|
||||
bv = bn.load(file)
|
||||
bv.update_analysis_and_wait()
|
||||
# Analyze test binary
|
||||
paths = self.ctr.analyze_binary(bv, max_call_level=3, enable_all_funs=True)
|
||||
# Assert results
|
||||
self.assertTrue(len(paths) == 0, "0 paths identified")
|
||||
# Close test binary
|
||||
bv.file.close()
|
||||
return
|
||||
|
||||
def test_08(
|
||||
self,
|
||||
filenames: List[str] = ["function_calling-08"]
|
||||
) -> None:
|
||||
self.test_07(filenames)
|
||||
return
|
||||
|
||||
|
||||
class TestPointerAnalysis(TestCase):
|
||||
|
||||
|
||||
Reference in New Issue
Block a user