Commit 83d2cd3d authored Mar 23, 2007 by KAMEZAWA Hiroyuki Committed by Tony Luck Mar 29, 2007

[IA64] bugfix stack layout upside-down



ia64 expects following vm layout:

== low memory
[register-stack grows up]
[memory-stack grows down]
== high memory

But the code assigns the base of the register stack at the
maximum stack size offset from the fixed address where the
stack *might* start.  Stack randomization will result in the
memory stack starting at a lower address than this, and if the
user has set a low stack limit with "ulimit -s", then you can
end up with the register stack above the memory stack (or if
you were very unlucky right on top of it!).

Fix: Calculate the base address for the register stack starting
from the actual address of the memory stack.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

parent 8a3a0ee7

arch/ia64/mm/init.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -155,7 +155,7 @@ ia64_set_rbs_bot (void)

		if (stack_size > MAX_USER_STACK_SIZE)
		stack_size = MAX_USER_STACK_SIZE;
		current->thread.rbs_bot = STACK_TOP - stack_size;
		current->thread.rbs_bot = PAGE_ALIGN(current->mm->start_stack - stack_size);
		}

		/*