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From:   Gilad Ben-Yossef <gilad@benyossef.com>
Date:   Mon, 27 Jan 2020 17:09:51 +0200
Message-ID: <CAOtvUMcmw_W-WVMGusCnkKBg71540c8Bo7LCMhz+t+dOsPUG3Q@mail.gmail.com>
Subject: Re: [RFC] crypto: ccree - protect against short scatterlists
To:     Geert Uytterhoeven <geert@linux-m68k.org>
Cc:     Herbert Xu <herbert@gondor.apana.org.au>,
        "David S. Miller" <davem@davemloft.net>,
        Ofir Drang <ofir.drang@arm.com>,
        Linux Crypto Mailing List <linux-crypto@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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On Mon, Jan 27, 2020 at 2:52 PM Geert Uytterhoeven <geert@linux-m68k.org> w=
rote:
>
> Hi Gilad,
>
> On Mon, Jan 27, 2020 at 1:29 PM Gilad Ben-Yossef <gilad@benyossef.com> wr=
ote:
> > 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@benyossef.com>
> > Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
>
> Thanks for your patch!
>
> Unable to handle kernel paging request at virtual address fffeffffc000000=
0

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 boa=
rd.
Blind debugging is hard...

Thanks again!
Gilad


values of =CE=B2 will give rise to dom!