M.Sc. Tezi Görüntüleme

      The current status of file system accesses in UNIX is insecure. This makes the file system easily vulnerable to malicious programs. The fact that it is quite difficult to understand whether a program is entirely reliable involves monitoring all file accesses dynamically. In this way, the behaviour of a program can be determined by analysing its file operations.

      The goal of this work is to develop an environment for UNIX operating systems, where file system interactions are purely reliable. Such an environment helps maintaining integrity of all files in the file system, controlling file accesses of concurrent proseses and carrying out effective protection against malicious programs.

      User file system and commands running on it are the materials used in this work. Proses tracing facilities that the UNIX operating system provides have a key role in detecting file operations of user commands. The detection of file operations is based on catching system calls and so the mechanism works independently of programs present in the system.

      Every kind of interaction which becomes harmful to the file system is handled by closely monitoring the file system calls issued by programs. Accesses to files are controlled according to the certain rules. Serialization of concurrent proseses is achieved and the probability of users' destructing their own files is reduced.

      Keywords: Process Tracing, System Calls, File Restoration, Secure Interaction