On Fri, Mar 15, 2013 at 10:57 AM, Mathieu Desnoyers
<mathieu.desnoyers@xxxxxxxxxxxx> wrote:
>
> In addition to get_user_pages_fast() issues, I see that there are many
> direct callers of get_user_pages() that seem to assume that access
> checks are performed within this function.
get_user_pages() does check permissions. It looks up the vma and
checks them there, which is much more than access_ok() ever does.
> AFAIU, on architectures that
> have a _PAGE_USER flag, this check is performed internally by pgd_bad()
> and pud_bad(), but what happens to all the others ?
Irrelevant. See above.
Linus
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