Re: futex local DoS on most architectures

[Lennert Buytenhek]

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@xxxxxxxxxxxxx>
> 
> 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@xxxxxxxxxxxxx>
> Acked-by: Ingo Molnar <mingo@xxxxxxx>

Looks good to me.  Thanks.
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