text stringlengths 1 93.6k |
|---|
},
|
}
|
for tag in var2value:
|
val_name = list(var2value[tag].keys())[0]
|
value = var2value[tag][val_name]
|
# value
|
if tag == 'true':
|
_ret["true"][def_il.tokens[0].text] = (
|
bv.parse_expression(raw_expr.replace(val_name, "0x{:X}".format(value))))
|
else:
|
_ret["false"][def_il.tokens[0].text] = (
|
bv.parse_expression(raw_expr.replace(val_name, "0x{:X}".format(value))))
|
return _ret
|
else:
|
print("未处理的情况")
|
raise Exception("未处理的情况")
|
"""
|
便利所有读取的变量，找到两个变量的上一个块是同一个 而且是 if else 的跳转
|
"""
|
def get_cmp_info(info):
|
for var in info["var_read"]:
|
var: binaryninja.mediumlevelil.SSAVariable
|
var_block = var.def_site.ssa_form.il_basic_block
|
# [<TrueBranch: aarch64@0x10>]
|
if var_block.incoming_edges.__len__() != 1:
|
continue
|
# 找到两个变量的上一个block是相同的
|
for in_var in info["var_read"]:
|
in_var: binaryninja.mediumlevelil.SSAVariable
|
in_var_block = in_var.def_site.ssa_form.il_basic_block
|
if var == in_var:
|
print(var,in_var)
|
continue
|
# [<FalseBranch: aarch64@0x12>]
|
if in_var_block.incoming_edges.__len__() != 1:
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continue
|
if var.def_site.vars_read.__len__() !=0:
|
continue
|
# 这两个变量的定义 block 应该不在一个 block
|
if in_var.def_site.il_basic_block == var.def_site.il_basic_block:
|
continue
|
if var_block.incoming_edges[0].source == in_var_block.incoming_edges[0].source :
|
same_block = var_block.incoming_edges[0].source
|
if_il : binaryninja.mediumlevelil.MediumLevelILIf = same_block[-1]
|
if if_il.operation == MediumLevelILOperation.MLIL_IF:
|
print(f"true -> {if_il.operands[1]} false -> {if_il.operands[2]}")
|
info["true_branch"] =if_il.operands[1]
|
info["false_branch"] =if_il.operands[2]
|
# 最顶层的
|
info["true_branch_var"] = var if var_block.start == info["true_branch"] else in_var
|
info["false_branch_var"] = var if var_block.start == info["false_branch"] else in_var
|
info["cmp"] = if_il
|
return True
|
return False
|
def patch_llil_ssa(func :binaryninja.function.Function,cmp_expr,true_addr,false_addr,jump_to_il : lowlevelil.LowLevelILInstruction):
|
llil = func.llil
|
true_il = func.get_llil_at(true_addr)
|
if true_il == None:
|
return False
|
true_inst_id =true_il.instr_index
|
false_il = func.get_llil_at(false_addr)
|
if false_il == None:
|
return False
|
false_inst_id = func.get_llil_at(false_addr).instr_index
|
true_label = LowLevelILLabel()
|
true_label.operand = true_inst_id
|
false_label = LowLevelILLabel()
|
false_label.operand = false_inst_id
|
# 确保生成指令的地址为当前 br reg的位置
|
llil.set_current_address(jump_to_il.address)
|
new_if_expr = llil.if_expr(cmp_expr,true_label,false_label)
|
llil.replace_expr(jump_to_il.expr_index,new_if_expr)
|
return True
|
def print_jump_target(bv: BinaryView):
|
func = bv.get_functions_containing(0x9cc7c)[0]
|
llil_ssa = func.llil.ssa_form
|
jump_to_list = find_operation(llil_ssa,LowLevelILOperation.LLIL_JUMP_TO)
|
find_all_flag_def_info(func.llil)
|
out= {
|
}
|
procedure_addr = set()
|
for jump_to in jump_to_list:
|
pp_print(f"jump to {hex(jump_to.address)} {str(jump_to)}")
|
jump_to_mlil = jump_to.mlil.ssa_form
|
br_var = jump_to_mlil.vars_read[0]
|
pp_print(f"br var {str(br_var)}")
|
info = {}
|
find_all_relative_var(br_var, info)
|
get_cmp_info(info)
|
jump_target = get_jump_target(bv, br_var, info)
|
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