linux-kernel - Re: [RFC] crypto: ccree - protect against short scatterlists

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Date:   Mon, 27 Jan 2020 17:09:51 +0200
From:   Gilad Ben-Yossef <gilad@...yossef.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Ofir Drang <ofir.drang@....com>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] crypto: ccree - protect against short scatterlists

On Mon, Jan 27, 2020 at 2:52 PM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> Hi Gilad,
>
> On Mon, Jan 27, 2020 at 1:29 PM Gilad Ben-Yossef <gilad@...yossef.com> wrote:
> > Deal gracefully with the event of being handed a scatterlist
> > which is shorter than expected.
> >
> > This mitigates a crash in some cases of Crypto API calls due with
> > scatterlists with a NULL first buffer, despite the aead.h
> > forbidding doing so.
> >
> > Signed-off-by: Gilad Ben-Yossef <gilad@...yossef.com>
> > Reported-by: Geert Uytterhoeven <geert@...ux-m68k.org>
>
> Thanks for your patch!
>
> Unable to handle kernel paging request at virtual address fffeffffc0000000

OK, this is a progress of a sort.
We now crash during unmap, not map.

Sent another go. If this doesn't work I'll wait till I reunite with the board.
Blind debugging is hard...

Thanks again!
Gilad


values of β will give rise to dom!