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

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Message-Id: <1181186821.14818.13.camel@localhost.localdomain>
Date:	Thu, 07 Jun 2007 13:27:01 +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 now we should do "recalc_sigpending()" only when signals may be
> *added* 
> (where messing with the "blocked" mask obviously is a form of adding 
> signals, and possibly the most common reason for having to recalculate
> the 
> sigpending mask).
> 
> Comments? This patch is _entirely_ and utterly untested, so I'm only 
> saying that this "feels" safer and more correct to me.

Oh and we still need to at least do the if (tsk == current) thingy
for the DRM notifier hack...

Ben.


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