linux-kernel - [PATCH][ia64][1/2] bugfix stack layout upside-down

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Date:	Fri, 23 Mar 2007 12:17:46 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>
Cc:	"tony.luck@...el.com" <tony.luck@...el.com>, dmosberger@...il.com,
	surinder.kumar@...cle.com, LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH][ia64][1/2] bugfix stack layout upside-down

ia64 expects following vm layout
==
[register-stack]
[memory-stack]
==
But, when ulimit -s is used  and stack-base-address-randomization works,
vm layout is sometimes following.
==
[memory-stack]
[register-stack]
==

If this happens,  register-stack cannot be expanded.

This patch fixes this bug by adjusting register-stack.

Signed-Off-By: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

Index: linux-2.6.21-rc4/arch/ia64/mm/init.c
===================================================================
--- linux-2.6.21-rc4.orig/arch/ia64/mm/init.c
+++ linux-2.6.21-rc4/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);
 }
 
 /*

-
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