The Research Of Android Storage Protection Technology Based On Block Device Driver

With the advent of mobile Internet, Android operating system is being installed in more and more intelligent devices. However, Android only offers limited protection for storage devices. Users can directly delete files and even format the flash media without restriction, which will result in loss of data. Furthermore, Android is very vulnerable to malware. The malware may cause damage to data and users will suffer immeasurable loss. The storage protection technology in Android has become an important research topic.There are mature applications based on the redirection technology in Windows operating system. Due to the different hierarchy of storage system, the realization in Windows is not applicable to Linux, let alone Android. In order to solve the data security problem in Android system, this paper proposes a storage protection technology based on the idea of storage operation redirection. This paper chooses the block device driver layer to implement the storage protection technology after analyzing the hierarchy of Android storage system. By modifying the kernel source code, we redirect I/O requests in block device driver layer. In redirection mode, block device driver will redirect the request data to a temporary region. This technology prevents the I/O requests from writing data into storage device and realizes the data protection.The experiment has been performed on a real cellphone device. The experiment results show that the storage protection technology based on redirection is feasible in Android. The stability of the operating system is also proved in redirection mode. The realization of redirection protection in Android is of great significance. User’s data will be protected by using the proposed storage protection technology and the security of Android operating system is improved.