Abstract: Summarizing the invention, a computer-implemented method is provided. The computer-implemented method comprises: allocating, by an operating system kernel, a physical memory block for a privileged function; storing, by the operating system kernel, the privileged function in the physical memory block; creating, by the operating system kernel, an entry for the physical memory block in a mapping table, wherein the entry associates the physical memory block to a virtual memory block in an address space of a program; setting, by the operating system kernel, a security bit for the entry in the mapping table; executing, by a processor, the program in unprivileged mode; and if the program requests the privileged function: checking, by the processor, whether the security bit is set; if the security bit is set, switching, by the processor, execution to kernel mode for performing the privileged function.

Abstract: Summarizing the invention, a computer-implemented method is provided. The computer-implemented method comprises; allocating, by an operating system kernel, a physical memory block for a privileged function; storing, by the operating system kernel, the privileged function in the physical memory block; creating, by the operating system kernel, an entry for the physical memory block in a mapping table, wherein the entry associates the physical memory block to a virtual memory block in an address space of a program; setting, by the operating system kernel, a security bit for the entry in the mapping table; executing, by a processor, the program in unprivileged mode; and if the program requests the privileged function: checking, by the processor, whether the security bit is set; if the security bit is set, switching, by the processor, execution to kernel mode for performing the privileged function.

Abstract: The invention relates to a method and an arrangement for randomly storing data in storage networks and/or an intranet and/or the Internet, a corresponding computer program product, and a corresponding computer-readable storage medium, which are particularly suitable for distributing and retrieving data in error-tolerant and faulty systems such as storage networks or the Internet. According to the inventive method for randomly storing data in storage networks and/or an intranet and/or the Internet, one or multiple intervals, the total length of which corresponds to the relative capacity of the system, is/are assigned to each storage system. Said intervals are represented in a [0,1) interval but can overlap with other intervals as opposed to existing strategies. A real point is then assigned to each data block within the [0,1) interval by means of a (pseudo)random function. Optionally, said point can be part of several intervals of storage systems.