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

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Date:	Tue, 12 Feb 2008 14:50:48 +0200
From:	Riku Voipio <riku.voipio@...ial.fi>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	Adrian Bunk <adrian.bunk@...ial.fi>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org, Mikael Pettersson <mikpe@...uu.se>,
	Lennert Buytenhek <buytenh@...tstofly.org>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: futex local DoS on most architectures

Thomas Gleixner wrote:
> 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
>   
Original credits for finding this issue belong to Lennert Buytenhek.
> 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 for me and kernel no longer deadlocks with this patch!
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