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

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Message-Id: <20160125133205.36542c86ada93761d8a9ff06@linux-foundation.org>
Date:	Mon, 25 Jan 2016 13:32:05 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org, oleg@...hat.com,
	peterz@...radead.org
Subject: Re: [PATCH] signals: work around random wakeups in sigsuspend()

On Mon, 25 Jan 2016 10:21:46 -0500 Sasha Levin <sasha.levin@...cle.com> wrote:

> A random wakeup can get us out of sigsuspend() without TIF_SIGPENDING
> being set.
> 
> Avoid that by making sure we were signaled, like sys_pause() does.

What we're lacking here is any description of the end-user-visible
effects of the bug.  Enough for people to be able to decide (and to
recognize!) whether their kernel needs this patch.</stdrefrain>