linux-kernel - Re: [PATCH/RFC] signal races/bugs, losing TIF

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Message-ID: <Pine.LNX.4.64.0706041935230.30836@alien.or.mcafeemobile.com>
Date:	Mon, 4 Jun 2007 19:38:21 -0700 (PDT)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
cc:	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: [PATCH/RFC] signal races/bugs, losing TIF_SIGPENDING and other
 woes

On Tue, 5 Jun 2007, Benjamin Herrenschmidt wrote:

>  - I still think there's something wrong with dequeue_signal() being
> potentially called with a task different than current by signalfd, since
> __dequeue_signal() (among others) mucks around with current regardless.
> I'd love to just make signalfd's read() only do anything if current ==
> ctx->tsk and remove the task argument from dequeue_signal... that would
> fix it nicely too no ?

There's got to be a clean solution that does not limit signalfd, no? I 
have no time to look at it immediately, but I can look into it in the 
next few days, if someone else does not do it before...



- Davide


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