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From: David Miller <davem@davemloft.net>
To: Larry.Finger@lwfinger.net
Cc: David.Laight@ACULAB.COM, linville@tuxdriver.com,
	linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
	bittorf@bluebottle.com, stable@vger.kernel.org
Subject: Re: [PATCH] b43: Increase number of RX DMA slots
Date: Tue, 19 Feb 2013 13:15:53 -0500 (EST)	[thread overview]
Message-ID: <20130219.131553.787630407148880340.davem@davemloft.net> (raw)
In-Reply-To: <5123BCFF.5090408@lwfinger.net>

From: Larry Finger <Larry.Finger@lwfinger.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.

  reply	other threads:[~2013-02-19 18:15 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-02-18  3:01 [PATCH] b43: Increase number of RX DMA slots Larry Finger
2013-02-18  3:01 ` Larry Finger
2013-02-18 16:18 ` Rafał Miłecki
2013-02-18 16:18   ` Rafał Miłecki
2013-02-18 16:55   ` Bastian Bittorf
2013-02-18 16:55     ` Bastian Bittorf
2013-02-18 17:04     ` Larry Finger
2013-02-18 20:10   ` Larry Finger
2013-02-19 20:01     ` Bastian Bittorf
2013-02-19 20:01       ` Bastian Bittorf
2013-02-19  5:52 ` David Miller
2013-02-19  5:52   ` David Miller
2013-02-19  9:42   ` David Laight
2013-02-19  9:57     ` Rafał Miłecki
2013-02-19 17:57     ` Larry Finger
2013-02-19 18:15       ` David Miller [this message]
2013-02-19 18:28         ` Larry Finger
2013-02-20  0:47           ` Julian Calaby
2013-02-20  2:42             ` Larry Finger
2013-02-20  6:26               ` Gábor Stefanik
2013-02-20  6:26                 ` Gábor Stefanik
2013-02-20  7:15                 ` Larry Finger
2013-02-20  8:15                   ` Bastian Bittorf
2013-02-20  8:15                     ` Bastian Bittorf
2013-02-20 15:49                     ` Larry Finger

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