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authorKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>2007-03-23 12:17:46 +0900
committerTony Luck <tony.luck@intel.com>2007-03-29 15:15:24 -0700
commit83d2cd3de48a7fb73838c45145780cfa9b1f61fd (patch)
tree85d056d9a718f69c7242a8bb6cde17fc928fa4cc /arch
parent8a3a0ee736b9a0150c9d894f2c6cc836a62125a1 (diff)
[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>
Diffstat (limited to 'arch')
-rw-r--r--arch/ia64/mm/init.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c
index c8da621aab1..4f36987eea7 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);
}
/*