From: Harvey Harrison <harvey.harrison@gmail.com>
To: Roland McGrath <roland@redhat.com>
Cc: Shi Weihua <shiwh@cn.fujitsu.com>, Ingo Molnar <mingo@elte.hu>,
linux-kernel@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH 1/5] signal(x86_32): Improve the signal stack overflow check
Date: Tue, 19 Feb 2008 21:54:07 -0800 [thread overview]
Message-ID: <1203486847.23194.4.camel@brick> (raw)
In-Reply-To: <20080220024928.0EE172701BA@magilla.localdomain>
On Tue, 2008-02-19 at 18:49 -0800, Roland McGrath wrote:
> > I spent some time read you mail carefully and dig into the code again.
> >
> > And yes, you are right. It's possible that SA_ONSTACK has been cleared
> > before the second signal on the same stack comes.
>
> It's not necessary for SA_ONSTACK to have "been cleared", by which I assume
> you mean a sigaction call with SA_ONSTACK not set in sa_flags. That is
> indeed possible, but it's not the only case your patch broke. It can just
> be a different signal whose sigaction never had SA_ONSTACK, when you are
> still on the signal stack from an earlier signal that did have SA_ONSTACK.
>
> > So this patch is wrong :( . I will revise the other 4 patches.
>
> For 2 and 3, I would rather just wait until we unify signal.c anyway.
>
I've been looking at that, at the same time a bunch of ia32/signal.c
looks like it can go away.
Harvey
next prev parent reply other threads:[~2008-02-20 5:54 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-18 10:22 [PATCH 1/5] signal(x86_32): Improve the signal stack overflow check Shi Weihua
2008-02-18 13:47 ` Ingo Molnar
2008-02-19 0:58 ` Shi Weihua
2008-02-19 18:50 ` Roland McGrath
2008-02-20 0:49 ` Shi Weihua
2008-02-20 1:18 ` Roland McGrath
2008-02-20 1:35 ` Shi Weihua
2008-02-20 1:44 ` Roland McGrath
2008-02-20 2:23 ` Shi Weihua
2008-02-20 2:49 ` Roland McGrath
2008-02-20 2:59 ` Shi Weihua
2008-02-20 5:54 ` Harvey Harrison [this message]
2008-02-20 7:59 ` Roland McGrath
2008-02-20 10:27 ` Ingo Molnar
2008-02-18 18:05 ` Valdis.Kletnieks
2008-02-19 2:11 ` Shi Weihua
2008-02-19 2:19 ` Shi Weihua
2008-02-19 11:05 ` Ingo Molnar
2008-02-19 23:21 ` Paul Mackerras
2008-02-19 23:25 ` H. Peter Anvin
2008-02-20 0:03 ` Roland McGrath
2008-02-20 0:04 ` Roland McGrath
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