On Thu, 3 Dec 2015, Dave Hansen wrote:
> diff -puN arch/x86/mm/fault.c~pkeys-15-access_error arch/x86/mm/fault.c
> --- a/arch/x86/mm/fault.c~pkeys-15-access_error 2015-12-03
> 16:21:26.872727820 -0800
> +++ b/arch/x86/mm/fault.c 2015-12-03 16:21:26.876728002 -0800
> @@ -900,10 +900,16 @@
From: Dave Hansen
We might not strictly have to make modifictions to
access_error() to check the VMA here.
If we do not, we will do this:
1. app sets VMA pkey to K
2. app touches a !present page
3. do_page_fault(), allocates and maps page, sets pte.pkey=K
4. return to userspace
5. touch instruc
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