linux-kernel - Re: [PATCH 1/3] signal(i386): alternative signal stack wraparound occurs

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Message-ID: <4704DD88.8030804@cn.fujitsu.com>
Date:	Thu, 04 Oct 2007 21:33:12 +0900
From:	Shi Weihua <shiwh@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	mikpe@...uu.se, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] signal(i386): alternative signal stack wraparound
 occurs

KAMEZAWA Hiroyuki wrote::
> On Thu, 04 Oct 2007 20:56:14 +0900
> Shi Weihua <shiwh@...fujitsu.com> wrote:
> 
>> 	stack.ss_sp = addr + pagesize;
>> 	stack.ss_flags = 0;
>> 	stack.ss_size = pagesize;
> Here is bad. 
> stack,ss_sp = addr;
> stack.ss_flags = 0;
> stack.ss_size = pagesize * 2;
[What the test code want to do]
addr+pagesize*2 - addr+pagesize	 -> sigaltstack
addr+pagesize	- addr		 -> protected region
The code want to catch overflow when esp enter the protected region.

But it failed ...
> 
> cheers.
> -Kame
> 
> 
> 

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