linux-kernel - Re: [PATCH crypto-next 07/23] block: cryptoloop: Remove VLA usage of skcipher

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Date:   Mon, 24 Sep 2018 10:53:30 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        Jens Axboe <axboe@...nel.dk>,
        linux-block <linux-block@...r.kernel.org>,
        Eric Biggers <ebiggers@...gle.com>,
        "open list:HARDWARE RANDOM NUMBER GENERATOR CORE" 
        <linux-crypto@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH crypto-next 07/23] block: cryptoloop: Remove VLA usage of skcipher

On Mon, Sep 24, 2018 at 4:52 AM, Ard Biesheuvel
<ard.biesheuvel@...aro.org> wrote:
> On Wed, 19 Sep 2018 at 04:11, Kees Cook <keescook@...omium.org> wrote:
>> @@ -119,7 +119,7 @@ cryptoloop_transfer(struct loop_device *lo, int cmd,
>>         unsigned in_offs, out_offs;
>>         int err;
>>
>> -       skcipher_request_set_tfm(req, tfm);
>> +       skcipher_request_set_sync_tfm(req, tfm);
>>         skcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP,
>>                                       NULL, NULL);
>>
>
> Does this work?

Everything is a direct wrapper for existing types and functions, so I
wouldn't expect any functional change. I haven't been able to test
this particular interface, though. cryptoloop is very deprecated,
isn't it?

-Kees

-- 
Kees Cook
Pixel Security