def _solver(self):
"""
Creates or gets a Claripy solver, based on the state options.
"""
if self._stored_solver is not None:
return self._stored_solver
track = o.CONSTRAINT_TRACKING_IN_SOLVER in self.state.options
if o.ABSTRACT_SOLVER in self.state.options:
self._stored_solver = claripy.SolverVSA()
elif o.REPLACEMENT_SOLVER in self.state.options:
self._stored_solver = claripy.SolverReplacement(auto_replace=False)
elif o.CACHELESS_SOLVER in self.state.options:
self._stored_solver = claripy.SolverCacheless(track=track)
elif o.COMPOSITE_SOLVER in self.state.options:
self._stored_solver = claripy.SolverComposite(track=track)
elif o.SYMBOLIC in self.state.options and o.approximation & self.state.options:
self._stored_solver = claripy.SolverHybrid(track=track)
elif o.SYMBOLIC in self.state.options:
self._stored_solver = claripy.Solver(track=track)
else:
self._stored_solver = claripy.SolverConcrete()
return self._stored_solver
def _remove_redundant_terms(cond):
"""
Extract all terms and test for each term if its truism impacts the truism of the entire condition. If not, the
term is redundant and can be replaced with a True.
"""
all_terms = set()
for term in ConditionProcessor._extract_terms(cond):
if term not in all_terms:
all_terms.add(term)
negations = {}
to_skip = set()
all_terms_without_negs = set()
for term in all_terms:
if term in to_skip:
continue
neg = claripy.Not(term)
if neg in all_terms:
negations[term] = neg
to_skip.add(neg)
all_terms_without_negs.add(term)
else:
all_terms_without_negs.add(term)
solver = claripy.SolverCacheless()
for term in all_terms_without_negs:
neg = negations.get(term, None)
replaced_with_true = ConditionProcessor._replace_term_in_ast(
cond, term, claripy.true, neg, claripy.false)
sat0 = solver.satisfiable(extra_constraints=(
cond,
claripy.Not(replaced_with_true),
))
sat1 = solver.satisfiable(extra_constraints=(
claripy.Not(cond),
replaced_with_true,
))
if sat0 or sat1:
continue
replaced_with_false = ConditionProcessor._replace_term_in_ast(
cond, term, claripy.false, neg, claripy.true)
sat0 = solver.satisfiable(extra_constraints=(
cond,
claripy.Not(replaced_with_false),
))
sat1 = solver.satisfiable(extra_constraints=(
claripy.Not(cond),
replaced_with_false,
))
if sat0 or sat1:
continue
# TODO: Finish the implementation
print(term, "is redundant")
def _solver(self):
"""
Creates or gets a Claripy solver, based on the state options.
"""
if self._stored_solver is not None:
return self._stored_solver
track = o.CONSTRAINT_TRACKING_IN_SOLVER in self.state.options
approximate_first = o.APPROXIMATE_FIRST in self.state.options
if o.STRINGS_ANALYSIS in self.state.options:
if 'smtlib_cvc4' in backend_manager.backends._backends_by_name:
our_backend = backend_manager.backends.smtlib_cvc4
elif 'smtlib_z3' in backend_manager.backends._backends_by_name:
our_backend = backend_manager.backends.smtlib_z3
elif 'smtlib_abc' in backend_manager.backends._backends_by_name:
our_backend = backend_manager.backends.smtlib_abc
else:
l.error(
"Cannot find a suitable string solver. Please ensure you have installed a string solver that "
"angr supports, and have imported the corresponding solver backend in claripy. You can try "
"adding \"from claripy.backends.backend_smtlib_solvers import *\" at the beginning of your "
"script.")
raise ValueError("Cannot find a suitable string solver")
if o.COMPOSITE_SOLVER in self.state.options:
self._stored_solver = claripy.SolverComposite(
template_solver_string=claripy.SolverCompositeChild(
backend=our_backend, track=track))
elif o.ABSTRACT_SOLVER in self.state.options:
self._stored_solver = claripy.SolverVSA()
elif o.SYMBOLIC in self.state.options and o.REPLACEMENT_SOLVER in self.state.options:
self._stored_solver = claripy.SolverReplacement(auto_replace=False)
elif o.SYMBOLIC in self.state.options and o.CACHELESS_SOLVER in self.state.options:
self._stored_solver = claripy.SolverCacheless(track=track)
elif o.SYMBOLIC in self.state.options and o.COMPOSITE_SOLVER in self.state.options:
self._stored_solver = claripy.SolverComposite(track=track)
elif o.SYMBOLIC in self.state.options and any(
opt in self.state.options for opt in o.approximation):
self._stored_solver = claripy.SolverHybrid(
track=track, approximate_first=approximate_first)
elif o.HYBRID_SOLVER in self.state.options:
self._stored_solver = claripy.SolverHybrid(
track=track, approximate_first=approximate_first)
elif o.SYMBOLIC in self.state.options:
self._stored_solver = claripy.Solver(track=track)
else:
self._stored_solver = claripy.SolverConcrete()
return self._stored_solver
def _solver(self):
"""
Creates or gets a Claripy solver, based on the state options.
"""
if self._stored_solver is not None:
return self._stored_solver
track = o.CONSTRAINT_TRACKING_IN_SOLVER in self.state.options
approximate_first = o.APPROXIMATE_FIRST in self.state.options
if o.STRINGS_ANALYSIS in self.state.options:
if 'smtlib_cvc4' in backend_manager.backends._backends_by_name:
our_backend = backend_manager.backends.smtlib_cvc4
elif 'smtlib_z3' in backend_manager.backends._backends_by_name:
our_backend = backend_manager.backends.smtlib_z3
elif 'smtlib_abc' in backend_manager.backends._backends_by_name:
our_backend = backend_manager.backends.smtlib_abc
else:
raise ValueError("Could not find suitable string solver!")
if o.COMPOSITE_SOLVER in self.state.options:
self._stored_solver = claripy.SolverComposite(
template_solver_string=claripy.SolverCompositeChild(
backend=our_backend, track=track))
elif o.ABSTRACT_SOLVER in self.state.options:
self._stored_solver = claripy.SolverVSA()
elif o.SYMBOLIC in self.state.options and o.REPLACEMENT_SOLVER in self.state.options:
self._stored_solver = claripy.SolverReplacement(auto_replace=False)
elif o.SYMBOLIC in self.state.options and o.CACHELESS_SOLVER in self.state.options:
self._stored_solver = claripy.SolverCacheless(track=track)
elif o.SYMBOLIC in self.state.options and o.COMPOSITE_SOLVER in self.state.options:
self._stored_solver = claripy.SolverComposite(track=track)
elif o.SYMBOLIC in self.state.options and any(
opt in self.state.options for opt in o.approximation):
self._stored_solver = claripy.SolverHybrid(
track=track, approximate_first=approximate_first)
elif o.HYBRID_SOLVER in self.state.options:
self._stored_solver = claripy.SolverHybrid(
track=track, approximate_first=approximate_first)
elif o.SYMBOLIC in self.state.options:
self._stored_solver = claripy.Solver(track=track)
else:
self._stored_solver = claripy.SolverConcrete()
return self._stored_solver
def _revert_short_circuit_conditions(cond):
# revert short-circuit conditions
# !A||(A&&!B) ==> !(A&&B)
if cond.op != "Or":
return cond
if len(cond.args) == 1:
# redundant operator. get rid of it
return cond.args[0]
or_arg0, or_arg1 = cond.args[:2]
if or_arg1.op == 'And':
pass
elif or_arg0.op == 'And':
or_arg0, or_arg1 = or_arg1, or_arg0
else:
return cond
not_a = or_arg0
solver = claripy.SolverCacheless()
if not_a.variables == or_arg1.args[0].variables:
solver.add(not_a == or_arg1.args[0])
not_b = or_arg1.args[1]
elif not_a.variables == or_arg1.args[1].variables:
solver.add(not_a == or_arg1.args[1])
not_b = or_arg1.args[0]
else:
return cond
if not solver.satisfiable():
# found it!
b = claripy.Not(not_b)
a = claripy.Not(not_a)
if len(cond.args) <= 2:
return claripy.Not(claripy.And(a, b))
else:
return claripy.Or(claripy.Not(claripy.And(a, b)),
*cond.args[2:])
else:
return cond
def _solver(self):
if self._stored_solver is not None:
return self._stored_solver
if o.ABSTRACT_SOLVER in self.state.options:
self._stored_solver = claripy.SolverVSA()
elif o.REPLACEMENT_SOLVER in self.state.options:
self._stored_solver = claripy.SolverReplacement(auto_replace=False)
elif o.CACHELESS_SOLVER in self.state.options:
self._stored_solver = claripy.SolverCacheless()
elif o.COMPOSITE_SOLVER in self.state.options:
self._stored_solver = claripy.SolverComposite()
elif o.SYMBOLIC in self.state.options and o.approximation & self.state.options:
self._stored_solver = claripy.SolverHybrid()
elif o.SYMBOLIC in self.state.options:
self._stored_solver = claripy.Solver()
else:
self._stored_solver = claripy.SolverConcrete()
return self._stored_solver
