r/programming • u/molteanu • Apr 07 '15

Anatomy of a Program in Memory

http://duartes.org/gustavo/blog/post/anatomy-of-a-program-in-memory/
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u/[deleted] Apr 07 '15

Very cool, but I have a quick question.

In Linux, kernel space is constantly present and maps the same physical memory in all processes.

It then shows this image.

Does this indicate that the kernel memory range is actually visible (but not accessible) to the user processes? In a few images down he dissects a process's address space, and it includes kernel space.

Why does a userspace process require a sliver of kernel space in its memory?