11/19/15 Pre-Class Work

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Harvard email address: *

Please indicate which course you are taking. *

CS61 (College)

CSCIE-61 (Extension)

How does the operating system ensure that a user process cannot clobber kernel memory? *

It creates separate page tables for each process.

It makes sure that any PTEs that reference kernel pages are not accessible to unprivileged processes.

It places kernel pages in low addresses in physical memory

It allocates memory in units of 4 KB

How does the operating system ensure that one user process cannot clobber another user process's data? *

It creates separate page tables for each process.

It makes sure that any PTEs that reference kernel pages are not accessible to unprivileged processes.

It places kernel pages in low addresses in physical memory

It allocates memory in units of 4 KB

The low order bits of a PTE are 001. This page is: *

Not in the process's virtual address space.

Valid, read-only to the process.

Valid, read-only to the kernel.

Valid, read-write to the process.

Valid, read-write to the kernel.

The low order bits of a PTE are 111. This page is: *

Not in the process's virtual address space.

Valid, read-only to the process.

Valid, read-only to the kernel.

Valid, read-write to the process.

Valid, read-write to the kernel.

The low order bits of a PTE are 010. This page is: *

Not in the process's virtual address space.

Valid, read-only to the process.

Valid, read-only to the kernel.

Valid, read-write to the process.

Valid, read-write to the kernel.

The low order bits of a PTE are 101. This page is: *

Not in the process's virtual address space.

Valid, read-only to the process.

Valid, read-only to the kernel.

Valid, read-write to the process.

Valid, read-write to the kernel.

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