linux-kernel - Re: [PATCH 1/5] signal(x86_32): Improve the signal stack overflow check

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Message-ID: <18363.25743.402510.695150@cargo.ozlabs.ibm.com>
Date:	Wed, 20 Feb 2008 10:21:51 +1100
From:	Paul Mackerras <paulus@...ba.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Shi Weihua <shiwh@...fujitsu.com>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Roland McGrath <roland@...hat.com>,
	torvalds@...ux-foundation.org
Subject: Re: [PATCH 1/5] signal(x86_32): Improve the signal stack overflow
	check

Ingo Molnar writes:
> 
> * Shi Weihua <shiwh@...fujitsu.com> wrote:
> 
> > We need to check for stack overflow only when the signal is on stack. 
> > So we can improve the patch "http://lkml.org/lkml/2007/11/27/101" as 
> > following.
> 
> thanks, applied.

These patches change the behaviour of programs that longjmp out of a
signal handler on an alternate stack, don't they?

I'm interested to know what gave you confidence that changing that
behaviour won't break existing working programs.

Paul.
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