Exemplos de do_format_string_read em C++ (Cpp)

Exemplo n.º 1

Arquivo: string_instrumentation.cpp Projeto: danpoe/cbmc

void string_instrumentationt::do_snprintf(
  goto_programt &dest,
  goto_programt::targett target,
  code_function_callt &call)
{
  const code_function_callt::argumentst &arguments=call.arguments();

  if(arguments.size()<3)
  {
    error().source_location=target->source_location;
    error() << "snprintf expected to have three or more arguments"
            << eom;
    throw 0;
  }

  goto_programt tmp;

  goto_programt::targett assertion=tmp.add_instruction();
  assertion->source_location=target->source_location;
  assertion->source_location.set_property_class("string");
  assertion->source_location.set_comment("snprintf buffer overflow");

  exprt bufsize=buffer_size(arguments[0]);
  assertion->make_assertion(
    binary_relation_exprt(bufsize, ID_ge, arguments[1]));

  do_format_string_read(tmp, target, arguments, 2, 3, "snprintf");

  if(call.lhs().is_not_nil())
  {
    goto_programt::targett return_assignment=tmp.add_instruction(ASSIGN);
    return_assignment->source_location=target->source_location;

    exprt rhs=side_effect_expr_nondett(call.lhs().type());
    rhs.add_source_location()=target->source_location;

    return_assignment->code=code_assignt(call.lhs(), rhs);
  }

  target->make_skip();
  dest.insert_before_swap(target, tmp);
}

Exemplo n.º 2

Arquivo: string_instrumentation.cpp Projeto: romainbrenguier/cbmc

void string_instrumentationt::do_sprintf(
  goto_programt &dest,
  goto_programt::targett target,
  code_function_callt &call)
{
  const code_function_callt::argumentst &arguments=call.arguments();
    
  if(arguments.size()<2)
  {
    error().source_location=target->source_location;
    error() << "sprintf expected to have two or more arguments" << eom;
    throw 0;
  }
  
  goto_programt tmp;
  
  goto_programt::targett assertion=tmp.add_instruction();  
  assertion->source_location=target->source_location;
  assertion->source_location.set_property_class("string");  
  assertion->source_location.set_comment("sprintf buffer overflow");
  
  // in the abstract model, we have to report a 
  // (possibly false) positive here
  assertion->make_assertion(false_exprt());
  
  do_format_string_read(tmp, target, arguments, 1, 2, "sprintf");
  
  if(call.lhs().is_not_nil())
  {
    goto_programt::targett return_assignment=tmp.add_instruction(ASSIGN);
    return_assignment->source_location=target->source_location;
    
    exprt rhs=side_effect_expr_nondett(call.lhs().type());
    rhs.add_source_location()=target->source_location;
      
    return_assignment->code=code_assignt(call.lhs(), rhs);
  }
  
  target->make_skip();
  dest.insert_before_swap(target, tmp);
}