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Question 2: (5 Marks)
Some computer systems do not provide a privileged mode (either user mode or kernel mode) of operation in hardware. Is it possible to construct a secure operating system for these computer systems? Write the name of the most secure operating system and justify your answer with solid reasons also tell either it is possible or not.
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Kernel mode, also referred to as system mode, is one of the two distinct modes of operation of the CPU (central processing unit) in Linux. The other isuser mode, a non-privileged mode for user programs, that is, for everything other than the kernel.
When the CPU is in kernel mode, it is assumed to be executing trusted software, and thus it can execute any instructions and reference any memoryaddresses (i.e., locations in memory). The kernel (which is the core of the operating system and has complete control over everything that occurs in the system) is trusted software, but all other programs are considered untrusted software. Thus, all user mode software must request use of the kernel by means of a system call in order to perform privileged instructions, such as process creation or input/output operations.
Always install the latest patches for the Operating System that you are running.
Sorry to say but main Pehaly Question ko thek tara sey Samaj nai
pa rha houn k Privileges kis ko allowed krni hain?
Can some one Help?
These instructions are allowed by the user or not or these instructions are allowed by kernel.
Jams Khan mention
Any Idea about first question?