Computing device and method for controlling access to driver programs

摘要

A computing device and a method for controlling access to driver programs obtains a first system time at the time that an application uses a CTL_CODE to access a driver program. The first system time and the CTL_CODE is encrypted to generate an encrypted CTL_CODE which is then sent to the driver program. The encrypted CTL_CODE is decrypted to obtain the first system time and the CTL_CODE therein. A second system time at the time that the driver program receives the encrypted CTL_CODE is obtained and compared with the first system time. Access to the driver program is allowed if a difference between the first system time and the second system time falls within a predetermined range, and access to the driver program is forbidden if the difference is beyond the predetermined range.

主权项

1. A method for controlling access to driver programs being performed by execution of computerized code by a processor of a computing device, comprising:
obtaining a first system time of the computing device at the time that an application uses a CTL_CODE to access a driver program; encrypting the first system time and the CTL_CODE to generate an encrypted CTL_CODE, and sending the encrypted CTL_CODE to a driver program; decrypting the encrypted CTL_CODE received by the driver program to obtain the first system time and the CTL_CODE; obtaining a second system time of the computing device at the time that the driver program receives the encrypted CTL_CODE; determining if a difference between the first system time and the second system time falls within a predetermined range; and allowing the application to access the driver program by using the CTL_CODE when the difference falls within the predetermined range, and forbidding the application to access the driver program by using the CTL_CODE when the difference falls outside the predetermined range.