On Thu, Dec 14, 2017 at 2:02 PM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
>
> _Should_ being the operative word, because I cannot currently see it
> DTRT. But maybe I'm missing the obvious -- I tend to do that at times.
At least the old get_user_pages_fast() code used to check the USER bit:
unsigned long need_pte_bits = _PAGE_PRESENT|_PAGE_USER;
if (write)
need_pte_bits |= _PAGE_RW;
but that may have been lost when we converted over to the generic code.
It shouldn't actually _matter_, since we'd need to change access_ok()
anyway (and gup had better check that!)
Linus
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