linux-kernel - Re: [RFC/RFT PATCH 00/15] crypto: improved skcipher, aead, and hash tests

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Date:   Thu, 24 Jan 2019 11:16:23 +0100
From:   Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:     Herbert Xu <herbert@...dor.apana.org.au>
Cc:     Eric Biggers <ebiggers@...nel.org>,
        "open list:HARDWARE RANDOM NUMBER GENERATOR CORE" 
        <linux-crypto@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Jason A . Donenfeld" <Jason@...c4.com>
Subject: Re: [RFC/RFT PATCH 00/15] crypto: improved skcipher, aead, and hash tests

On Thu, 24 Jan 2019 at 10:24, Herbert Xu <herbert@...dor.apana.org.au> wrote:
>
> On Thu, Jan 24, 2019 at 09:50:35AM +0100, Ard Biesheuvel wrote:
> >
> > Thanks for yet another round of cleanup
> >
> > I'll look into these, but I'd like to clarify one thing first.
> >
> > IIUC, you are trying to deal with the case where a single scatterlist
> > element describes a range that strides two pages, and I wonder if that
> > is a valid use of scatterlists in the first place.
> >
> > Herbert?
>
> Yes it is valid.  IIRC the network stack may generate such a
> scatterlist.
>

OK, so how many adjacent physical pages is a scatterlist entry
permitted to cover? Unbounded?