linux-kernel - Re: [PATCH] signals: work around random wakeups in sigsuspend()

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Message-ID: <20160125193758.GB6357@twins.programming.kicks-ass.net>
Date:	Mon, 25 Jan 2016 20:37:58 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Sasha Levin <sasha.levin@...cle.com>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, mingo@...nel.org
Subject: Re: [PATCH] signals: work around random wakeups in sigsuspend()

On Mon, Jan 25, 2016 at 08:09:15PM +0100, Oleg Nesterov wrote:
> On 01/25, Sasha Levin wrote:
> >
> > A random wakeup can get us out of sigsuspend() without TIF_SIGPENDING
> > being set.
> 
> and TIF_RESTORE_SIGMASK is just wrong in this case. I'd say this is the
> bugfix, not work-around ;)

Agreed!

> > Avoid that by making sure we were signaled, like sys_pause() does.
> >
> > Signed-off-by: Sasha Levin <sasha.levin@...cle.com>
> 
> Acked-by: Oleg Nesterov <oleg@...hat.com>

Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>