netdev - Re: [PATCH 1/2] virtio-net: Verify page list size before fitting into skb

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Message-ID: <CAOJsxLHQZCvRQMcs08GZgDgR9AwtePdr=t7kos6XfMF_dgxZGw@mail.gmail.com>
Date:	Mon, 26 Sep 2011 22:45:35 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Sasha Levin <levinsasha928@...il.com>
Cc:	"Michael S. Tsirkin" <mst@...hat.com>,
	linux-kernel@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
	kvm@...r.kernel.org
Subject: Re: [PATCH 1/2] virtio-net: Verify page list size before fitting into skb

On Mon, Sep 26, 2011 at 10:37 PM, Sasha Levin <levinsasha928@...il.com> wrote:
>> Interesting.  This is a theoretical issue, correct?
>> Not a crash you actually see.
>
> Actually it was an actual crash caused when our virtio-net driver in kvm
> tools did funny things and passed '(u32)-1' length as a buffer length to
> the guest kernel.

I'm not sure what Michael means with "theoretical issue" here. Can the guest
driver assume that the hypervisor doesn't attempt to do nasty things?

                          Pekka
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