On Fri, Mar 15, 2013 at 11:01 AM, Linus Torvalds
<torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
>
> get_user_pages() does check permissions. It looks up the vma and
> checks them there, which is much more than access_ok() ever does.
To clarify: the fact that a vma exists at all already means "it's a
user mapping" (with the special gate area being a secondary user
mapping). So you don't need any kind of explicit user check.
Linus
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