On Thu, May 23, 2013 at 06:07:54PM +0100, Steve Capper wrote:

If we consider the following code sequence:

	my_pte = pte_modify(entry, myprot);
	x = pte_write(my_pte);
	y = pte_exec(my_pte);

If myprot comes from a PROT_NONE page, then x and y will both be
true which is undesireable behaviour.

This patch sets the no-execute and read-only bits for PAGE_NONE
such that the code above will return false for both x and y.

Signed-off-by: Steve Capper <redacted>

Acked-by: Catalin Marinas <catalin.marinas@arm.com>