linux-kernel - Re: [RFC PATCH v3] crypto: Add IV generation algorithms

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Date:   Thu, 19 Jan 2017 10:12:23 +0530
From:   Binoy Jayan <binoy.jayan@...aro.org>
To:     Gilad Ben-Yossef <gilad@...yossef.com>
Cc:     Oded <oded.golombek@....com>, Ofir <Ofir.Drang@....com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        linux-crypto@...r.kernel.org, Mark Brown <broonie@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Linux kernel mailing list <linux-kernel@...r.kernel.org>,
        Alasdair Kergon <agk@...hat.com>,
        Mike Snitzer <snitzer@...hat.com>, dm-devel@...hat.com,
        Shaohua Li <shli@...nel.org>, linux-raid@...r.kernel.org,
        Rajendra <rnayak@...eaurora.org>,
        Milan Broz <gmazyland@...il.com>
Subject: Re: [RFC PATCH v3] crypto: Add IV generation algorithms

Hi Gilad,

On 18 January 2017 at 20:51, Gilad Ben-Yossef <gilad@...yossef.com> wrote:
> I have some review comments and a bug report -

Thank you very much for testing this on ARM and for the comments.

> I'm pretty sure this needs to be
>
>  n2 = bio_segments(ctx->bio_out);

Yes you are right, that was a typo :)

>> +
>> +       rinfo.is_write = bio_data_dir(ctx->bio_in) == WRITE;
>
> Please consider wrapping the above boolean expression in parenthesis.

Well, I can do that to enhance the clarity.

>> +       rinfo.iv_sector = ctx->cc_sector;
>> +       rinfo.nents = nents;
>> +       rinfo.iv = iv;
>> +
>> +       skcipher_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out,
>
> Also, where do the scatterlist src2 and dst2 that you use
> sg_set_page() get sg_init_table() called on?
> I couldn't figure it out...

Thank you pointing this out. I missed out to add sg_init_table(src2, 1)
and sg_init_table(dst2, 1), but sg_set_page is used in geniv_iter_block.
This is probably the reason for the panic on ARM platform. However it
ran fine under qemu-x86. May be I should setup an arm platform too
for testing.

Regards,
Binoy