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 <steve.capper@xxxxxxxxxx> Acked-by: Catalin Marinas <catalin.marinas@xxxxxxx> -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>