netdev - Re: [PATCH v3] xmit_compl_seq: information to reclaim vmsplice buffers

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Message-ID: <AANLkTimdrFuYONq6FvBW41AnhpA6Q+acSUmy4CiJatYL@mail.gmail.com>
Date:	Mon, 27 Sep 2010 11:38:36 -0700
From:	Tom Herbert <therbert@...gle.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, sridharr@...gle.com
Subject: Re: [PATCH v3] xmit_compl_seq: information to reclaim vmsplice buffers

>
> Can not packets referencing this memory
> still be outstanding at the NIC device, if retransmit happens
> before the ack but after the packet was passed to a device?
>
> It's true that the reftransmit will likely get discarded
> by the remote end, but this might be a security issue
> if an application puts sensitive data in the buffer
> and that gets inadvertently sent on the wire, can it not?
>
Yes, this hole probably does exist.  I don't know how to fix it other
than more API that specifically reports when all references to a
buffer are released.  In the case of TCP that probably means we'd need
a destructor.

> --
> MST
>
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