# pylint:disable=missing-class-docstring,too-many-boolean-expressions
from itertools import chain
from typing import Iterable, Optional
import logging
import archinfo
import claripy
import ailment
import pyvex
from claripy import FSORT_DOUBLE, FSORT_FLOAT
from ...engines.light import SimEngineLight, SimEngineLightAILMixin, SpOffset
from ...errors import SimEngineError, SimMemoryMissingError
from ...calling_conventions import DEFAULT_CC, SimRegArg
from ...storage.memory_mixins.paged_memory.pages.multi_values import MultiValues
from ...knowledge_plugins.key_definitions.atoms import Atom, Register, Tmp, MemoryLocation
from ...knowledge_plugins.key_definitions.constants import OP_BEFORE, OP_AFTER
from ...knowledge_plugins.key_definitions.live_definitions import Definition, LiveDefinitions
from ...code_location import CodeLocation
from .subject import SubjectType
from .external_codeloc import ExternalCodeLocation
from .rd_state import ReachingDefinitionsState
from .function_handler import FunctionHandler, FunctionCallData
l = logging.getLogger(name=__name__)
[docs]class SimEngineRDAIL(
SimEngineLightAILMixin,
SimEngineLight,
): # pylint:disable=abstract-method
arch: archinfo.Arch
state: ReachingDefinitionsState
[docs] def __init__(
self,
project,
function_handler: Optional[FunctionHandler] = None,
stack_pointer_tracker=None,
):
super().__init__()
self.project = project
self._function_handler = function_handler
self._visited_blocks = None
self._dep_graph = None
self._stack_pointer_tracker = stack_pointer_tracker
self._stmt_handlers = {
ailment.Stmt.Assignment: self._ail_handle_Assignment,
ailment.Stmt.Store: self._ail_handle_Store,
ailment.Stmt.Jump: self._ail_handle_Jump,
ailment.Stmt.ConditionalJump: self._ail_handle_ConditionalJump,
ailment.Stmt.Call: self._ail_handle_Call,
ailment.Stmt.Return: self._ail_handle_Return,
ailment.Stmt.DirtyStatement: self._ail_handle_DirtyStatement,
ailment.Stmt.Label: ...,
}
self._expr_handlers = {
claripy.ast.BV: self._ail_handle_BV,
ailment.Expr.Tmp: self._ail_handle_Tmp,
ailment.Stmt.Call: self._ail_handle_CallExpr,
ailment.Expr.Register: self._ail_handle_Register,
ailment.Expr.Load: self._ail_handle_Load,
ailment.Expr.Convert: self._ail_handle_Convert,
ailment.Expr.Reinterpret: self._ail_handle_Reinterpret,
ailment.Expr.ITE: self._ail_handle_ITE,
ailment.Expr.UnaryOp: self._ail_handle_UnaryOp,
ailment.Expr.BinaryOp: self._ail_handle_BinaryOp,
ailment.Expr.Const: self._ail_handle_Const,
ailment.Expr.StackBaseOffset: self._ail_handle_StackBaseOffset,
ailment.Expr.DirtyExpression: self._ail_handle_DirtyExpression,
}
[docs] def process(self, state, *args, dep_graph=None, visited_blocks=None, block=None, fail_fast=False, **kwargs):
self._dep_graph = dep_graph
self._visited_blocks = visited_blocks
# we are using a completely different state. Therefore, we directly call our _process() method before
# SimEngine becomes flexible enough.
try:
self._process(
state,
None,
block=block,
)
except SimEngineError as e:
if fail_fast is True:
raise e
return self.state
#
# Private methods
#
def _external_codeloc(self):
return ExternalCodeLocation(self.state.codeloc.context)
def _set_codeloc(self):
# TODO do we want a better mechanism to specify context updates?
self.state.move_codelocs(
CodeLocation(
self.block.addr,
self.stmt_idx,
ins_addr=self.ins_addr,
block_idx=self.block.idx,
context=self.state.codeloc.context,
)
)
#
# AIL statement handlers
#
def _handle_Stmt(self, stmt):
if self.state.analysis:
self.state.analysis.stmt_observe(self.stmt_idx, stmt, self.block, self.state, OP_BEFORE)
self.state.analysis.insn_observe(self.ins_addr, stmt, self.block, self.state, OP_BEFORE)
self._set_codeloc()
handler = self._stmt_handlers.get(type(stmt), None)
if handler is not None:
if handler is not ...:
handler(stmt)
else:
self.l.warning("Unsupported statement type %s.", type(stmt).__name__)
if self.state.analysis:
self.state.analysis.stmt_observe(self.stmt_idx, stmt, self.block, self.state, OP_AFTER)
self.state.analysis.insn_observe(self.ins_addr, stmt, self.block, self.state, OP_AFTER)
def _expr(self, expr):
handler = self._expr_handlers.get(type(expr), None)
if handler is not None:
return handler(expr)
else:
self.l.warning("Unsupported expression type %s.", type(expr).__name__)
return None
def _ail_handle_Assignment(self, stmt):
"""
:param ailment.Assignment stmt:
:return:
"""
src = self._expr(stmt.src)
dst = stmt.dst
if src is None:
src = MultiValues(self.state.top(dst.bits))
if isinstance(dst, ailment.Tmp):
self.state.kill_and_add_definition(Tmp(dst.tmp_idx, dst.size), src)
self.tmps[dst.tmp_idx] = src
elif isinstance(dst, ailment.Register):
reg = Register(dst.reg_offset, dst.size)
self.state.kill_and_add_definition(reg, src)
if dst.reg_offset == self.arch.sp_offset:
self.state._sp_adjusted = True
# TODO: Special logic that frees all definitions above the current stack pointer
else:
l.warning("Unsupported type of Assignment dst %s.", type(dst).__name__)
def _ail_handle_Store(self, stmt: ailment.Stmt.Store) -> None:
data: MultiValues = self._expr(stmt.data)
addr: MultiValues = self._expr(stmt.addr)
size: int = stmt.size
if stmt.guard is not None:
self._expr(stmt.guard)
addr_v = addr.one_value()
if addr_v is not None and not self.state.is_top(addr_v):
if self.state.is_stack_address(addr_v):
stack_offset = self.state.get_stack_offset(addr_v)
if stack_offset is not None:
memory_location = MemoryLocation(SpOffset(self.arch.bits, stack_offset), size, endness=stmt.endness)
else:
memory_location = None
elif self.state.is_heap_address(addr_v):
memory_location = None
else:
memory_location = MemoryLocation(addr_v._model_concrete.value, size, endness=stmt.endness)
if memory_location is not None:
self.state.kill_and_add_definition(memory_location, data, endness=stmt.endness)
def _ail_handle_Jump(self, stmt):
_ = self._expr(stmt.target)
def _ail_handle_ConditionalJump(self, stmt):
_ = self._expr(stmt.condition) # pylint:disable=unused-variable
if stmt.true_target is not None:
_ = self._expr(stmt.true_target) # pylint:disable=unused-variable
if stmt.false_target is not None:
_ = self._expr(stmt.false_target) # pylint:disable=unused-variable
ip = Register(self.arch.ip_offset, self.arch.bytes)
self.state.kill_definitions(ip)
def _ail_handle_Call(self, stmt: ailment.Stmt.Call):
data = self._handle_Call_base(stmt, is_expr=False)
src = data.ret_values
if src is None:
return
dst = stmt.ret_expr
if isinstance(dst, ailment.Tmp):
_, defs = self.state.kill_and_add_definition(Tmp(dst.tmp_idx, dst.size), src, uses=data.ret_values_deps)
self.tmps[dst.tmp_idx] = src
elif isinstance(dst, ailment.Register):
full_reg_offset, full_reg_size = self.arch.registers[self.arch.register_names[dst.reg_offset]]
if dst.size != full_reg_size:
# we need to extend the value to overwrite the entire register
otv = {}
next_off = 0
if full_reg_offset < dst.reg_offset:
otv[0] = {claripy.BVV(0, (dst.reg_offset - full_reg_offset) * 8)}
next_off = dst.reg_offset - full_reg_offset
for off, items in src.items():
otv[next_off + off] = set(items)
next_off += len(src) // 8
if next_off < full_reg_size:
otv[next_off] = {claripy.BVV(0, (full_reg_size - next_off) * 8)}
src = MultiValues(offset_to_values=otv)
reg = Register(full_reg_offset, full_reg_size)
_, defs = self.state.kill_and_add_definition(reg, src, uses=data.ret_values_deps)
else:
defs = set()
if self.state.analysis:
self.state.analysis.function_calls[data.callsite_codeloc].ret_defns.update(defs)
def _handle_Call_base(self, stmt: ailment.Stmt.Call, is_expr: bool = False) -> FunctionCallData:
if isinstance(stmt.target, ailment.Expr.Expression):
target = self._expr(stmt.target) # pylint:disable=unused-variable
func_name = None
elif isinstance(stmt.target, str):
func_name = stmt.target
target = None
else:
target = stmt.target
func_name = None
ip = Register(self.arch.ip_offset, self.arch.bytes)
self.state.kill_definitions(ip)
data = FunctionCallData(
self.state.codeloc,
self._function_handler.make_function_codeloc(
target, self.state.codeloc, self.state.analysis.model.func_addr
),
target,
cc=stmt.calling_convention,
prototype=stmt.prototype,
name=func_name,
args_values=[self._expr(arg) for arg in stmt.args] if stmt.args is not None else None,
redefine_locals=stmt.args is None and not is_expr,
caller_will_handle_single_ret=True,
ret_atoms={Atom.from_ail_expr(stmt.ret_expr, self.arch)} if stmt.ret_expr is not None else None,
)
self._function_handler.handle_function(self.state, data)
if hasattr(stmt, "arg_defs"):
for arg_def in stmt.arg_defs:
arg_def: Definition
if arg_def in self.state.all_definitions:
self.state.kill_definitions(arg_def.atom)
# kill all cc_ops
if "cc_op" in self.arch.registers:
self.state.kill_definitions(Register(*self.arch.registers["cc_op"]))
self.state.kill_definitions(Register(*self.arch.registers["cc_dep1"]))
self.state.kill_definitions(Register(*self.arch.registers["cc_dep2"]))
self.state.kill_definitions(Register(*self.arch.registers["cc_ndep"]))
return data
def _ail_handle_Return(self, stmt: ailment.Stmt.Return): # pylint:disable=unused-argument
cc = None
prototype = None
if self.state.analysis.subject.type == SubjectType.Function:
cc = self.state.analysis.subject.content.calling_convention
prototype = self.state.analysis.subject.content.prototype
# import ipdb; ipdb.set_trace()
if cc is None:
# fall back to the default calling convention
cc_cls = DEFAULT_CC.get(self.project.arch.name, None)
if cc_cls is None:
l.warning("Unknown default calling convention for architecture %s.", self.project.arch.name)
cc = None
else:
cc = cc_cls(self.project.arch)
if cc is not None:
# callee-saved args
for reg in self.arch.register_list:
if (
reg.general_purpose
and reg.name not in cc.CALLER_SAVED_REGS
and reg.name not in cc.ARG_REGS
and reg.vex_offset
not in {
self.arch.sp_offset,
self.arch.bp_offset,
self.arch.ip_offset,
}
and (isinstance(cc.RETURN_VAL, SimRegArg) and reg.name != cc.RETURN_VAL.reg_name)
):
self.state.add_register_use(reg.vex_offset, reg.size)
if stmt.ret_exprs:
# Handle return expressions
for ret_expr in stmt.ret_exprs:
self._expr(ret_expr)
return
# No return expressions are available.
# consume registers that are potentially useful
# return value
if cc is not None and prototype is not None and prototype.returnty is not None:
ret_val = cc.return_val(prototype.returnty)
if isinstance(ret_val, SimRegArg):
if ret_val.clear_entire_reg:
offset, size = cc.arch.registers[ret_val.reg_name]
else:
offset = cc.arch.registers[ret_val.reg_name][0] + ret_val.reg_offset
size = ret_val.size
self.state.add_register_use(offset, size)
else:
l.error("Cannot handle CC with non-register return value location")
# base pointer
# TODO: Check if the stack base pointer is used as a stack base pointer in this function or not
self.state.add_register_use(self.project.arch.bp_offset, self.project.arch.bytes)
# We don't add sp since stack pointers are supposed to be get rid of in AIL. this is definitely a hack though
# self.state.add_use(Register(self.project.arch.sp_offset, self.project.arch.bits // 8))
def _ail_handle_DirtyStatement(self, stmt: ailment.Stmt.DirtyStatement):
# TODO: The logic below is subject to change when ailment.Stmt.DirtyStatement is changed
if isinstance(stmt.dirty_stmt, pyvex.stmt.Dirty):
# TODO: We need dirty helpers for a more complete understanding of clobbered registers
tmp = stmt.dirty_stmt.tmp
if tmp in (-1, 0xFFFFFFFF):
return
size = 32 # FIXME: We don't know the size.
self.state.kill_and_add_definition(Tmp(tmp, size), None)
self.tmps[tmp] = None
else:
l.warning("Unexpected type of dirty statement %s.", type(stmt.dirty_stmt))
#
# AIL expression handlers
#
def _ail_handle_BV(self, expr: claripy.ast.Base) -> MultiValues:
return MultiValues(expr)
def _ail_handle_Tmp(self, expr: ailment.Expr.Tmp) -> MultiValues:
self.state.add_tmp_use(expr.tmp_idx)
tmp = super()._ail_handle_Tmp(expr)
if tmp is None:
return MultiValues(self.state.top(expr.bits))
return tmp
def _ail_handle_CallExpr(self, expr: ailment.Stmt.Call) -> MultiValues:
data = self._handle_Call_base(expr, is_expr=True)
result = data.ret_values
if result is not None and data.ret_values_deps is not None:
for dep in data.ret_values_deps:
result = self.state.annotate_mv_with_def(result, dep)
return result
def _ail_handle_Register(self, expr: ailment.Expr.Register) -> MultiValues:
self.state: ReachingDefinitionsState
reg_offset = expr.reg_offset
size = expr.size
# bits = size * 8
# Special handling for SP and BP
if self._stack_pointer_tracker is not None:
if reg_offset == self.arch.sp_offset:
sb_offset = self._stack_pointer_tracker.offset_before(self.ins_addr, self.arch.sp_offset)
if sb_offset is not None:
return MultiValues(v=self.state._initial_stack_pointer() + sb_offset)
elif reg_offset == self.arch.bp_offset:
sb_offset = self._stack_pointer_tracker.offset_before(self.ins_addr, self.arch.bp_offset)
if sb_offset is not None:
return MultiValues(v=self.state._initial_stack_pointer() + sb_offset)
reg_atom = Register(reg_offset, size)
# first check if it is ever defined
try:
value: MultiValues = self.state.register_definitions.load(reg_offset, size=size)
except SimMemoryMissingError as ex:
# the full value does not exist, but we handle partial existence, too
missing_defs = None
if ex.missing_size != size:
existing_values = []
i = 0
while i < size:
try:
value: MultiValues = self.state.register_definitions.load(reg_offset + i, size=1)
except SimMemoryMissingError as ex_:
i += ex_.missing_size
continue
i += 1
existing_values.append(value)
# extract existing definitions
for existing_value in existing_values:
for vs in existing_value.values():
for v in vs:
if missing_defs is None:
missing_defs = self.state.extract_defs(v)
else:
missing_defs = chain(missing_defs, self.state.extract_defs(v))
if missing_defs is not None:
self.state.add_register_use_by_defs(missing_defs, expr=expr)
top = self.state.top(size * self.state.arch.byte_width)
# annotate it
extloc = self._external_codeloc()
top = self.state.annotate_with_def(top, Definition(reg_atom, extloc))
value = MultiValues(top)
# write it back
self.state.kill_and_add_definition(reg_atom, value, override_codeloc=extloc)
# extract Definitions
defs: Optional[Iterable[Definition]] = None
for vs in value.values():
for v in vs:
if defs is None:
defs = self.state.extract_defs(v)
else:
defs = chain(defs, self.state.extract_defs(v))
if defs is None:
# define it right away as an external dependency
self.state.kill_and_add_definition(reg_atom, value, override_codeloc=self._external_codeloc())
else:
self.state.add_register_use_by_defs(defs, expr=expr)
return value
def _ail_handle_Load(self, expr: ailment.Expr.Load) -> MultiValues:
addrs: MultiValues = self._expr(expr.addr)
size = expr.size
bits = expr.bits
if expr.guard is not None:
self._expr(expr.guard)
self._expr(expr.alt)
# convert addrs from MultiValues to a list of valid addresses
if addrs.count() == 1:
addrs_v = next(iter(addrs.values()))
else:
top = self.state.top(bits)
# annotate it
extloc = self._external_codeloc()
dummy_atom = MemoryLocation(0, size, endness=expr.endness)
def_ = Definition(dummy_atom, extloc)
top = self.state.annotate_with_def(top, def_)
# add use
self.state.add_memory_use_by_def(def_, expr=expr)
return MultiValues(top)
result: Optional[MultiValues] = None
for addr in addrs_v:
if not isinstance(addr, claripy.ast.Base):
continue
if addr.concrete:
# a concrete address
concrete_addr: int = addr._model_concrete.value
try:
vs: MultiValues = self.state.memory_definitions.load(concrete_addr, size=size, endness=expr.endness)
defs = set(LiveDefinitions.extract_defs_from_mv(vs))
except SimMemoryMissingError:
continue
self.state.add_memory_use_by_defs(defs, expr=expr)
result = result.merge(vs) if result is not None else vs
elif self.state.is_stack_address(addr):
stack_offset = self.state.get_stack_offset(addr)
if stack_offset is not None:
stack_addr = self.state.live_definitions.stack_offset_to_stack_addr(stack_offset)
try:
vs: MultiValues = self.state.stack_definitions.load(stack_addr, size=size, endness=expr.endness)
defs = set(LiveDefinitions.extract_defs_from_mv(vs))
except SimMemoryMissingError:
continue
# XXX should be add_stack_use_by_defs?
self.state.add_memory_use_by_defs(defs, expr=expr)
result = result.merge(vs) if result is not None else vs
else:
# XXX does ail not support heap tracking?
l.debug("Memory address %r undefined or unsupported at pc %#x.", addr, self.ins_addr)
if result is None:
top = self.state.top(bits)
# TODO: Annotate top with a definition
result = MultiValues(top)
return result
def _ail_handle_Convert(self, expr: ailment.Expr.Convert) -> MultiValues:
to_conv: MultiValues = self._expr(expr.operand)
bits = expr.to_bits
size = bits // self.arch.byte_width
if to_conv.count() == 1 and 0 in to_conv:
values = to_conv[0]
else:
top = self.state.top(expr.to_bits)
# annotate it
dummy_atom = MemoryLocation(0, size, endness=self.arch.memory_endness)
def_ = Definition(dummy_atom, self._external_codeloc())
top = self.state.annotate_with_def(top, def_)
# add use
self.state.add_memory_use_by_def(def_, expr=expr)
return MultiValues(top)
converted = set()
for v in values:
if expr.to_bits < expr.from_bits:
conv = v[expr.to_bits - 1 : 0]
elif expr.to_bits > expr.from_bits:
conv = claripy.ZeroExt(expr.to_bits - expr.from_bits, v)
else:
conv = v
converted.add(conv)
return MultiValues(offset_to_values={0: converted})
def _ail_handle_Reinterpret(self, expr: ailment.Expr.Reinterpret) -> MultiValues:
_: MultiValues = self._expr(expr.operand)
bits = expr.to_bits
# we currently do not support floating-point operations. therefore, we return TOP directly
reinterpreted = self.state.top(bits)
return MultiValues(reinterpreted)
def _ail_handle_ITE(self, expr: ailment.Expr.ITE) -> MultiValues:
_: MultiValues = self._expr(expr.cond)
iftrue: MultiValues = self._expr(expr.iftrue)
_: MultiValues = self._expr(expr.iffalse)
top = self.state.top(len(iftrue))
return MultiValues(top)
def _ail_handle_Not(self, expr: ailment.Expr.UnaryOp) -> MultiValues:
operand: MultiValues = self._expr(expr.operand)
bits = expr.bits
if operand is None:
return MultiValues(self.state.top(bits))
operand_v = operand.one_value()
if operand_v is not None and operand_v.concrete:
r = MultiValues(~operand_v)
else:
r = MultiValues(self.state.top(bits))
return r
def _ail_handle_Neg(self, expr: ailment.Expr.UnaryOp) -> MultiValues:
operand: MultiValues = self._expr(expr.operand)
bits = expr.bits
if operand is None:
return MultiValues(self.state.top(bits))
operand_v = operand.one_value()
if operand_v is not None and operand_v.concrete:
r = MultiValues(-operand_v)
else:
r = MultiValues(self.state.top(bits))
return r
def _ail_handle_Neg(self, expr: ailment.Expr.UnaryOp) -> MultiValues:
operand: MultiValues = self._expr(expr.operand)
bits = expr.bits
r = None
operand_v = operand.one_value()
if operand_v is not None and operand_v.concrete:
r = MultiValues(offset_to_values={0: {-operand_v}})
else:
r = MultiValues(offset_to_values={0: {self.state.top(bits)}})
return r
def _ail_handle_BinaryOp(self, expr: ailment.Expr.BinaryOp) -> MultiValues:
r = super()._ail_handle_BinaryOp(expr)
if isinstance(r, ailment.Expr.BinaryOp):
l.warning("Unimplemented operation %s.", expr.op)
top = self.state.top(expr.bits)
return MultiValues(top)
return r
def _ail_handle_Add(self, expr: ailment.Expr.BinaryOp) -> MultiValues:
expr0: MultiValues = self._expr(expr.operands[0])
expr1: MultiValues = self._expr(expr.operands[1])
bits = expr.bits
r = None
expr0_v = expr0.one_value()
expr1_v = expr1.one_value()
if expr0_v is None and expr1_v is None:
r = MultiValues(self.state.top(bits))
elif expr0_v is None and expr1_v is not None:
# adding a single value to a multivalue
if expr0.count() == 1 and 0 in expr0:
if all(v.concrete or self.state.is_stack_address(v) for v in expr0[0]):
vs = {v + expr1_v for v in expr0[0]}
r = MultiValues(offset_to_values={0: vs})
elif expr0_v is not None and expr1_v is None:
# adding a single value to a multivalue
if expr1.count() == 1 and 0 in expr1:
if all(v.concrete for v in expr1[0]):
vs = {v + expr0_v for v in expr1[0]}
r = MultiValues(offset_to_values={0: vs})
else:
# adding two single values together
if (expr0_v.concrete or self.state.is_stack_address(expr0_v)) and expr1_v.concrete:
r = MultiValues(expr0_v + expr1_v)
if r is None:
r = MultiValues(self.state.top(bits))
return r
def _ail_handle_Sub(self, expr: ailment.Expr.BinaryOp) -> MultiValues:
expr0: MultiValues = self._expr(expr.operands[0])
expr1: MultiValues = self._expr(expr.operands[1])
bits = expr.bits
r = None
expr0_v = expr0.one_value()
expr1_v = expr1.one_value()
if expr0_v is None and expr1_v is None:
r = MultiValues(self.state.top(bits))
elif expr0_v is None and expr1_v is not None:
# subtracting a single value from a multivalue
if expr0.count() == 1 and 0 in expr0:
if all(v.concrete or self.state.is_stack_address(v) for v in expr0[0]):
vs = {v - expr1_v for v in expr0[0]}
r = MultiValues(offset_to_values={0: vs})
elif expr0_v is not None and expr1_v is None:
# subtracting a single value from a multivalue
if expr1.count() == 1 and 0 in expr1:
if all(v.concrete for v in expr1[0]):
vs = {expr0_v - v for v in expr1[0]}
r = MultiValues(offset_to_values={0: vs})
else:
if (expr0_v.concrete or self.state.is_stack_address(expr0_v)) and expr1_v.concrete:
r = MultiValues(expr0_v - expr1_v)
if r is None:
r = MultiValues(self.state.top(bits))
return r
def _ail_handle_Div(self, expr):
arg0, arg1 = expr.operands
self._expr(arg0)
self._expr(arg1)
bits = expr.bits
r = MultiValues(self.state.top(bits))
return r
def _ail_handle_DivMod(self, expr):
return self._ail_handle_Div(expr)
def _ail_handle_Mul(self, expr):
arg0, arg1 = expr.operands
self._expr(arg0)
self._expr(arg1)
bits = expr.bits
r = MultiValues(self.state.top(bits))
return r
def _ail_handle_Mull(self, expr):
arg0, arg1 = expr.operands
self._expr(arg0)
self._expr(arg1)
bits = expr.bits
r = MultiValues(self.state.top(bits))
return r
def _ail_handle_Mod(self, expr):
arg0, arg1 = expr.operands
self._expr(arg0)
self._expr(arg1)
bits = expr.bits
r = MultiValues(self.state.top(bits))
return r
def _ail_handle_Mul(self, expr: ailment.Expr.BinaryOp) -> MultiValues:
expr0: MultiValues = self._expr(expr.operands[0])
expr1: MultiValues = self._expr(expr.operands[1])
bits = expr.bits
expr0_v = expr0.one_value()
expr1_v = expr1.one_value()
if expr0_v is not None and expr1_v is not None and expr0_v.concrete and expr1_v.concrete:
r = MultiValues(offset_to_values={0: {expr0_v * expr1_v}})
else:
r = MultiValues(offset_to_values={0: {self.state.top(bits)}})
return r
def _ail_handle_Div(self, expr: ailment.Expr.BinaryOp) -> MultiValues:
expr0: MultiValues = self._expr(expr.operands[0])
expr1: MultiValues = self._expr(expr.operands[1])
bits = expr.bits
expr0_v = expr0.one_value()
expr1_v = expr1.one_value()
if (
expr0_v is not None
and expr1_v is not None
and expr0_v.concrete
and expr1_v.concrete
and expr1_v._model_concrete.value != 0
):
r = MultiValues(offset_to_values={0: {expr0_v / expr1_v}})
else:
r = MultiValues(offset_to_values={0: {self.state.top(bits)}})
return r
def _ail_handle_Shr(self, expr: ailment.Expr.BinaryOp) -> MultiValues:
expr0: MultiValues = self._expr(expr.operands[0])
expr1: MultiValues = self._expr(expr.operands[1])
bits = expr.bits
r = None
expr0_v = expr0.one_value()
expr1_v = expr1.one_value()
if expr0_v is None and expr1_v is None:
r = MultiValues(self.state.top(bits))
elif expr0_v is None and expr1_v is not None:
# each value in expr0 >> expr1_v
if expr0.count() == 1 and 0 in expr0:
if all(v.concrete for v in expr0[0]):
vs = {
(claripy.LShR(v, expr1_v._model_concrete.value) if v.concrete else self.state.top(bits))
for v in expr0[0]
}
r = MultiValues(offset_to_values={0: vs})
elif expr0_v is not None and expr1_v is None:
# expr0_v >> each value in expr1
if expr1.count() == 1 and 0 in expr1:
if all(v.concrete for v in expr1[0]):
vs = {
(claripy.LShR(expr0_v, v._model_concrete.value) if v.concrete else self.state.top(bits))
for v in expr1[0]
}
r = MultiValues(offset_to_values={0: vs})
else:
if expr0_v.concrete and expr1_v.concrete:
r = MultiValues(claripy.LShR(expr0_v, expr1_v._model_concrete.value))
if r is None:
r = MultiValues(self.state.top(bits))
return r
def _ail_handle_Sar(self, expr: ailment.Expr.BinaryOp) -> MultiValues:
expr0: MultiValues = self._expr(expr.operands[0])
expr1: MultiValues = self._expr(expr.operands[1])
bits = expr.bits
r = None
expr0_v = expr0.one_value()
expr1_v = expr1.one_value()
if expr0_v is None and expr1_v is None:
r = MultiValues(self.state.top(bits))
elif expr0_v is None and expr1_v is not None:
# each value in expr0 >> expr1_v
if expr0.count() == 1 and 0 in expr0:
if all(v.concrete for v in expr0[0]):
vs = {
(claripy.LShR(v, expr1_v._model_concrete.value) if v.concrete else self.state.top(bits))
for v in expr0[0]
}
r = MultiValues(offset_to_values={0: vs})
elif expr0_v is not None and expr1_v is None:
# expr0_v >> each value in expr1
if expr1.count() == 1 and 0 in expr1:
if all(v.concrete for v in expr1[0]):
vs = {
(claripy.LShR(expr0_v, v._model_concrete.value) if v.concrete else self.state.top(bits))
for v in expr1[0]
}
r = MultiValues(offset_to_values={0: vs})
else:
if expr0_v.concrete and expr1_v.concrete:
r = MultiValues(expr0_v >> expr1_v._model_concrete.value)
if r is None:
r = MultiValues(self.state.top(bits))
return r
def _ail_handle_Shl(self, expr: ailment.Expr.BinaryOp) -> MultiValues:
expr0: MultiValues = self._expr(expr.operands[0])
expr1: MultiValues = self._expr(expr.operands[1])
bits = expr.bits
r = None
expr0_v = expr0.one_value()
expr1_v = expr1.one_value()
if expr0_v is None and expr1_v is None:
r = MultiValues(self.state.top(bits))
elif expr0_v is None and expr1_v is not None:
# each value in expr0 << expr1_v
if expr0.count() == 1 and 0 in expr0:
if all(v.concrete for v in expr0[0]):
vs = {
((v << expr1_v._model_concrete.value) if v.concrete else self.state.top(bits)) for v in expr0[0]
}
r = MultiValues(offset_to_values={0: vs})
elif expr0_v is not None and expr1_v is None:
# expr0_v >> each value in expr1
if expr1.count() == 1 and 0 in expr1:
if all(v.concrete for v in expr1[0]):
vs = {
((expr0_v << v._model_concrete.value) if v.concrete else self.state.top(bits)) for v in expr1[0]
}
r = MultiValues(offset_to_values={0: vs})
else:
if expr0_v.concrete and expr1_v.concrete:
r = MultiValues(expr0_v << expr1_v._model_concrete.value)
if r is None:
r = MultiValues(self.state.top(bits))
return r
def _ail_handle_And(self, expr: ailment.Expr.BinaryOp) -> MultiValues:
expr0: MultiValues = self._expr(expr.operands[0])
expr1: MultiValues = self._expr(expr.operands[1])
bits = expr.bits
r = None
expr0_v = expr0.one_value()
expr1_v = expr1.one_value()
if expr0_v is None and expr1_v is None:
r = MultiValues(self.state.top(bits))
return r
if expr0_v is None and expr1_v is not None:
# expr1_v & each value in expr0
if expr0.count() == 1 and 0 in expr0:
if all(v.concrete for v in expr0[0]):
vs = {v & expr1_v for v in expr0[0]}
r = MultiValues(offset_to_values={0: vs})
elif expr0_v is not None and expr1_v is None:
# expr0_v & each value in expr1
if expr1.count() == 1 and 0 in expr1:
if all(v.concrete for v in expr1[0]):
vs = {expr0_v & v for v in expr1[0]}
r = MultiValues(offset_to_values={0: vs})
else:
# special handling for stack alignment
if self.state.is_stack_address(expr0_v):
r = MultiValues(expr0_v)
else:
if expr0_v.concrete and expr1_v.concrete:
r = MultiValues(expr0_v & expr1_v)
if r is None:
r = MultiValues(self.state.top(bits))
return r
def _ail_handle_Or(self, expr: ailment.Expr.BinaryOp) -> MultiValues:
expr0: MultiValues = self._expr(expr.operands[0])
expr1: MultiValues = self._expr(expr.operands[1])
bits = expr.bits
r = None
expr0_v = expr0.one_value()
expr1_v = expr1.one_value()
if expr0_v is None and expr1_v is None:
r = MultiValues(self.state.top(bits))
elif expr0_v is None and expr1_v is not None:
# expr1_v | each value in expr0
if expr0.count() == 1 and 0 in expr0:
if all(v.concrete for v in expr0[0]):
vs = {v | expr1_v for v in expr0[0]}
r = MultiValues(offset_to_values={0: vs})
elif expr0_v is not None and expr1_v is None:
# expr0_v | each value in expr1
if expr1.count() == 1 and 0 in expr1:
if all(v.concrete for v in expr1[0]):
vs = {expr0_v | v for v in expr1[0]}
r = MultiValues(offset_to_values={0: vs})
else:
if expr0_v.concrete and expr1_v.concrete:
r = MultiValues(expr0_v | expr1_v)
if r is None:
r = MultiValues(self.state.top(bits))
return r
def _ail_handle_LogicalAnd(self, expr: ailment.Expr.BinaryOp) -> MultiValues:
expr0: MultiValues = self._expr(expr.operands[0])
expr1: MultiValues = self._expr(expr.operands[1])
bits = expr.bits
r = None
expr0_v = expr0.one_value()
expr1_v = expr1.one_value()
# TODO: can maybe be smarter about this. if we can determine that expr0 is never falsey, we can just return it,
# TODO: or if it's always falsey we can return expr1 (did I get this backwards?)
if expr0_v is None or expr1_v is None:
r = MultiValues(self.state.top(bits))
return r
r = MultiValues(claripy.If(expr0_v == 0, expr0_v, expr1_v))
return r
def _ail_handle_LogicalOr(self, expr: ailment.Expr.BinaryOp) -> MultiValues:
expr0: MultiValues = self._expr(expr.operands[0])
expr1: MultiValues = self._expr(expr.operands[1])
bits = expr.bits
r = None
expr0_v = expr0.one_value()
expr1_v = expr1.one_value()
if expr0_v is None or expr1_v is None:
r = MultiValues(self.state.top(bits))
return r
r = MultiValues(claripy.If(expr0_v != 0, expr0_v, expr1_v))
return r
def _ail_handle_Xor(self, expr: ailment.Expr.BinaryOp) -> MultiValues:
expr0: MultiValues = self._expr(expr.operands[0])
expr1: MultiValues = self._expr(expr.operands[1])
bits = expr.bits
r = None
expr0_v = expr0.one_value()
expr1_v = expr1.one_value()
if expr0_v is None and expr1_v is None:
r = MultiValues(self.state.top(bits))
elif expr0_v is None and expr1_v is not None:
# expr1_v ^ each value in expr0
if expr0.count() == 1 and 0 in expr0:
if all(v.concrete for v in expr0[0]):
vs = {v ^ expr1_v for v in expr0[0]}
r = MultiValues(offset_to_values={0: vs})
elif expr0_v is not None and expr1_v is None:
# expr0_v ^ each value in expr1
if expr1.count() == 1 and 0 in expr1:
if all(v.concrete for v in expr1[0]):
vs = {expr0_v ^ v for v in expr1[0]}
r = MultiValues(offset_to_values={0: vs})
else:
if expr0_v.concrete and expr1_v.concrete:
r = MultiValues(expr0_v ^ expr1_v)
if r is None:
r = MultiValues(self.state.top(bits))
return r
def _ail_handle_Concat(self, expr: ailment.Expr.BinaryOp) -> MultiValues:
expr0: MultiValues = self._expr(expr.operands[0])
expr1: MultiValues = self._expr(expr.operands[1])
bits = expr.bits
r = None
expr0_v = expr0.one_value()
expr1_v = expr1.one_value()
if expr0_v is None and expr1_v is None:
r = MultiValues(self.state.top(bits))
elif expr0_v is None and expr1_v is not None:
# concatenate expr1_v with each value in expr0
if expr0.count() == 1 and 0 in expr0:
if all(v.concrete for v in expr0[0]):
vs = {claripy.Concat(v, expr1_v) for v in expr0[0]}
r = MultiValues(offset_to_values={0: vs})
elif expr0_v is not None and expr1_v is None:
# concatenate expr0_v with each value in expr1
if expr1.count() == 1 and 0 in expr1:
if all(v.concrete for v in expr1[0]):
vs = {claripy.Concat(expr0_v, v) for v in expr1[0]}
r = MultiValues(offset_to_values={0: vs})
else:
if expr0_v.concrete and expr1_v.concrete:
r = MultiValues(claripy.Concat(expr0_v, expr1_v))
if r is None:
r = MultiValues(self.state.top(bits))
return r
def _ail_handle_Cmp(self, expr) -> MultiValues:
op0 = self._expr(expr.operands[0])
op1 = self._expr(expr.operands[1])
if op0 is None:
_ = expr.operands[0]
if op1 is None:
_ = expr.operands[1]
top = self.state.top(expr.bits)
return MultiValues(top)
_ail_handle_CmpF = _ail_handle_Cmp
_ail_handle_CmpEQ = _ail_handle_Cmp
_ail_handle_CmpNE = _ail_handle_Cmp
_ail_handle_CmpLE = _ail_handle_Cmp
_ail_handle_CmpLEs = _ail_handle_Cmp
_ail_handle_CmpLT = _ail_handle_Cmp
_ail_handle_CmpLTs = _ail_handle_Cmp
_ail_handle_CmpGE = _ail_handle_Cmp
_ail_handle_CmpGEs = _ail_handle_Cmp
_ail_handle_CmpGT = _ail_handle_Cmp
_ail_handle_CmpGTs = _ail_handle_Cmp
def _ail_handle_TernaryOp(self, expr) -> MultiValues:
_ = self._expr(expr.operands[0])
_ = self._expr(expr.operands[1])
_ = self._expr(expr.operands[2])
top = self.state.top(expr.bits)
return MultiValues(offset_to_values={0: {top}})
def _ail_handle_Const(self, expr) -> MultiValues:
self.state.mark_const(expr.value, expr.size)
if isinstance(expr.value, float):
sort = None
if expr.bits == 64:
sort = FSORT_DOUBLE
elif expr.bits == 32:
sort = FSORT_FLOAT
return MultiValues(claripy.FPV(expr.value, sort))
else:
return MultiValues(claripy.BVV(expr.value, expr.bits))
def _ail_handle_StackBaseOffset(self, expr: ailment.Expr.StackBaseOffset) -> MultiValues:
stack_addr = self.state.stack_address(expr.offset)
return MultiValues(stack_addr)
def _ail_handle_DirtyExpression(
self, expr: ailment.Expr.DirtyExpression
) -> MultiValues: # pylint:disable=no-self-use
if isinstance(expr.dirty_expr, ailment.Expr.VEXCCallExpression):
for operand in expr.dirty_expr.operands:
self._expr(operand)
top = self.state.top(expr.bits)
return MultiValues(top)
#
# User defined high-level statement handlers
#