Re: [MirageOS-devel] alteration of tcp payload

[Thomas Leonard <talex5@xxxxxxxxx>]

Are you using a non-page-aligned buffer?

On 5 November 2014 13:09, Richard Mortier
<Richard.Mortier@xxxxxxxxxxxxxxxx> wrote:
> no immediate ideas i'm afraid but: masoud, isn't this exactly the problem
> you were describing to me yesterday?
>
> if so, definitely sounds like worth filing an issue on github...
>
> On 5 Nov 2014, at 12:56, Michael Moon <michaelmoon.pr@xxxxxxxxx> wrote:
>
>
> I am sending some data over a tcp connection, and I found that for a xen
> unikernel, data is changed to some arbitrary bit string of the same length.
> Looking at netif.ml and writev function, I noticed that tcp packet is split
> into two pages: first page (first_page variable) contains the headers, and
> the second page contains the payload. Dumping pages in writev function shows
> that payload is passed correctly to the function write_request, but tcp_dump
> on the interface captures a different payload data that looks arbitrary.
> Even if I modify writev to replace my payload with a string of predefined
> characters (let us say all zeros), I still observe a different payload
> coming out of the interface.
>
> Any idea?
>
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>
> --
> Cheers,
>
> R.
>
>
>
>
>
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-- 
Dr Thomas Leonard        http://0install.net/
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