linux-kernel - Re: [PATCH] signals: Generate warning when flush_signals() is called from non-kthread context

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Message-ID: <CAFLxGvz9Narxzb1Q-QToPwa10dFLG7TzZHXBvd=PpVNAnqaB-Q@mail.gmail.com>
Date:	Sat, 2 May 2015 18:33:36 +0200
From:	Richard Weinberger <richard.weinberger@...il.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Neil Brown <neilb@...e.de>, Evgeniy Polyakov <zbr@...emap.net>,
	Stephen Smalley <sds@...ho.nsa.gov>,
	Alex Williamson <alex.williamson@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	kvm <kvm@...r.kernel.org>
Subject: Re: [PATCH] signals: Generate warning when flush_signals() is called
 from non-kthread context

On Fri, May 1, 2015 at 9:38 PM, Ingo Molnar <mingo@...nel.org> wrote:
> diff --git a/kernel/signal.c b/kernel/signal.c
> index d51c5ddd855c..100e30afe5d2 100644
> --- a/kernel/signal.c
> +++ b/kernel/signal.c
> @@ -427,6 +427,10 @@ void flush_signals(struct task_struct *t)
>  {
>         unsigned long flags;
>
> +       /* Only kthreads are allowed to destroy signals: */
> +       if (WARN_ON_ONCE(!(current->flags & PF_KTHREAD)))

Shouldn't this be t->flags?

-- 
Thanks,
//richard
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