If a user didn’t have root privileges, could that user still write a user space program with inline assembly to turn off protection mode on the computer to overwrite memory in other segments assuming the OS is linux?
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If a user didn’t have root privileges, could that user still write a user space program with inline assembly to turn off protection mode on the computer to overwrite memory in other segments assuming the OS is linux?
Not unless the user knows of a security vulnerability to get root permissions. Mechanisms like /dev/mem allow root to read and write all userspace memory, and kernel module loading allows root access to kernel memory and the rest of the system’s IO space.