linux-kernel - Re: futex local DoS on most architectures

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Date:	Mon, 11 Feb 2008 15:16:12 +0100
From:	Lennert Buytenhek <buytenh@...tstofly.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Adrian Bunk <adrian.bunk@...ial.fi>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org, Riku Voipio <riku.voipio@...ial.fi>,
	Mikael Pettersson <mikpe@...uu.se>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: futex local DoS on most architectures

On Mon, Feb 11, 2008 at 02:59:34PM +0100, Thomas Gleixner wrote:

> Subject: futex: disable PI/robust on archs w/o valid implementation
> From: Thomas Gleixner <tglx@...utronix.de>
> 
> We have to disable the complete PI/robust functionality for those
> archs, which do not implement futex_atomic_cmpxchg_inatomic(). The
> code in question relies on a valid implementation and does not expect
> -ENOSYS, which is returned by the stub implementation in
> asm-generic/futex.h
> 
> Pointed out by: Mikael Pettersson, Riku Voipio and Adrian Bunk

FWIW, I reported it originally.


> This patch is intended for easy backporting and needs to be cleaned up
> further for current mainline.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Acked-by: Ingo Molnar <mingo@...e.hu>

Looks good to me.  Thanks.
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