From 83d2cd3de48a7fb73838c45145780cfa9b1f61fd Mon Sep 17 00:00:00 2001 From: KAMEZAWA Hiroyuki Date: Fri, 23 Mar 2007 12:17:46 +0900 Subject: [PATCH] [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 Signed-off-by: Tony Luck --- arch/ia64/mm/init.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c index c8da621..4f36987 100644 --- a/arch/ia64/mm/init.c +++ b/arch/ia64/mm/init.c @@ -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); } /* -- 2.7.4