Re: [PATCH 1/3] signal(i386): alternative signal stack wraparoundoccurs

[Shi Weihua]

KAMEZAWA Hiroyuki wrote::
> On Thu, 04 Oct 2007 20:56:14 +0900
> Shi Weihua <shiwh@xxxxxxxxxxxxxx> 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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