netdev - Re: [PATCH] b43: Increase number of RX DMA slots

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Message-Id: <20130219.131553.787630407148880340.davem@davemloft.net>
Date:	Tue, 19 Feb 2013 13:15:53 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	Larry.Finger@...inger.net
Cc:	David.Laight@...LAB.COM, linville@...driver.com,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	bittorf@...ebottle.com, stable@...r.kernel.org
Subject: Re: [PATCH] b43: Increase number of RX DMA slots

From: Larry Finger <Larry.Finger@...inger.net>
Date: Tue, 19 Feb 2013 11:57:19 -0600

> The real problem is that some (perhaps all) versions of the firmware,
> which manages the 'in' pointer of the FIFO ring, appears to fail to
> detect the ring full condition. That is the real cause of the freeze;
> however, we do not have access to the firmware source. We don't even
> have the right to redistribute it, which is why we have the
> b43-fwcutter work around.

I understand your constraints, but this is a trivially remotely
DoS'able condition even on slow CPU atom laptops.

Send an "expansive" full sized frame followed by 300 or so 64-byte UDP
packets --> instant hang.
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