linux-kernel - Re: signalfd API issues (was Re: [PATCH/RFC] signal races/bugs, losing TIF

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Message-Id: <1181186517.14818.7.camel@localhost.localdomain>
Date:	Thu, 07 Jun 2007 13:21:57 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Jeff Dike <jdike@...toit.com>
Cc:	Nicholas Miell <nmiell@...cast.net>,
	Davide Libenzi <davidel@...ilserver.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: signalfd API issues (was Re: [PATCH/RFC] signal races/bugs,
	losing TIF_SIGPENDING and other woes)

On Wed, 2007-06-06 at 08:52 -0400, Jeff Dike wrote:
> On Wed, Jun 06, 2007 at 12:50:04PM +1000, Benjamin Herrenschmidt wrote:
> > Yeah, synchronous signals should probably never be delivered to another
> > process, even via signalfd. There's no point delivering a SEGV to
> > somebody else :-)
> 
> Sure there is.  UML does exactly that - intercepting child signals
> (including SEGV) with wait.

UML is definitely what I call a special case :-) Now the question is how
do you get them ? Are you via some code path I haven't figured out
calling dequeue_signal() from another context ?

Ben.


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