What does memory protection do?
Memory protection is a way to control memory access rights on a computer, and is a part of most modern instruction set architectures and operating systems. The main purpose of memory protection is to prevent a process from accessing memory that has not been allocated to it.
What are the methods of memory protection?
Memory protection for computer security includes additional techniques such as address space layout randomization and executable space protection.
What is physical memory protection?
Physical memory protection (PMP) is a standard RISC-V feature that allows the firmware to specify physical memory regions and control the memory access permissions. Many systems have adopted PMP to protect memory regions for high-privilege binaries (e.g., firmware) or devices.
How is memory protection done during paging?
Paging Memory protection in paging is achieved by associating protection bits with each page. These bits are associated with each page table entry and specify protection on the corresponding page.
What is addressing binding?
The Address Binding refers to the mapping of computer instructions and data to physical memory locations. Both logical and physical addresses are used in computer memory. It assigns a physical memory region to a logical pointer by mapping a physical address to a logical address known as a virtual address.
What is logical address space and physical address space?
Logical Address Space is the set of all logical addresses generated by CPU for a program whereas the set of all physical address mapped to corresponding logical addresses is called Physical Address Space.
What is fence register?
Fence register:- The fence was a predefined memory address, enabling the operating system to reside on one side and the user to stay on the other. Fence registers are low-level OS memory management techniques, something you generally don’t touch unless you’re writing extremely specialized programs.
What is CPU protection?
CPU protection is referred to as we can not give CPU to a process forever, it should be for some limited time otherwise other processes will not get the chance to execute the process. So for that, a timer is used to get over from this situation.
What factors complicate memory protection?
The factors that complicate the memory protection includes various form of the indirect addressing, cooperating processes and virtual memory management, which consists of two or more processes that wants to share the region of memory. The memory protection overheads each of the write operations.
What are memory management requirements?
Memory management keeps track of the status of each memory location, whether it is allocated or free. It allocates the memory dynamically to the programs at their request and frees it for reuse when it is no longer needed.