In addition to randomisation of the stack pointer within the stack, the stack
itself should be randomized too.  We need both approaches, we can only
randomize the stack itself in pagesize increments.  However randomizing large
ranges with the stackpointer runs into the situation where a huge chunk of the
stack rlimit is used by the randomisation; this is undesirable so we need to
do both.
Signed-off-by: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>