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[IA64] bugfix stack layout upside-down

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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>
This commit is contained in:
KAMEZAWA Hiroyuki 2007-03-23 12:17:46 +09:00 committed by Tony Luck
parent 8a3a0ee736
commit 83d2cd3de4
1 changed files with 1 additions and 1 deletions
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2
arch/ia64/mm/init.c
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@ -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);
}
/*