linux-kernel - Re: [BUG] ptraced process waiting on syscall may return kernel internal errnos

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Date:	Thu, 07 Jun 2007 13:25:24 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Roland McGrath <roland@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Satoru Takeuchi <takeuchi_satoru@...fujitsu.com>,
	Oleg Nesterov <oleg@...sign.ru>
Subject: Re: [BUG] ptraced process waiting on syscall may return kernel
	internal errnos

On Wed, 2007-06-06 at 08:35 -0700, Linus Torvalds wrote:
> 
> So I think that the *right* place to clear TIF_SIGPENDING is actually in 
> "get_signal_to_deliver()", because that function is called _only_ by the 
> actual per-architecture "I'm going to deliver a signal now".

That was my initial idea but it has an issue with kernel
threads :-( There are in kernel thingies that use signals to a certain
extend and rely on being able to dequeue and/or clear sigpending (or
else they just loop instead of waiting in various loops).

A bit of a can of worms if you ask me.

Ben.


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