linux-kernel - Re: [PATCH] crypto: testmgr: don't allocate IV on stack

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Message-ID: <CAOtvUMdRjyRCDaF5wN+VEdYvwLS92mH-L5C=s24mqHYqPteCVg@mail.gmail.com>
Date:   Tue, 31 Oct 2017 10:05:28 +0200
From:   Gilad Ben-Yossef <gilad@...yossef.com>
To:     Herbert Xu <herbert@...dor.apana.org.au>
Cc:     "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: [PATCH] crypto: testmgr: don't allocate IV on stack

On Tue, Oct 31, 2017 at 9:59 AM, Herbert Xu <herbert@...dor.apana.org.au> wrote:
> On Tue, Oct 31, 2017 at 07:56:26AM +0000, Gilad Ben-Yossef wrote:
>> The IV was allocated on the stack in testmgr skcipher tests.
>> Since HW based tfm providers need to DMA the IV to the HW,
>> this leads to problems and is detected by the DMA-API debug
>> code.
>>
>> Fix it by allocating the IV using kmalloc instead.
>>
>> Signed-off-by: Gilad Ben-Yossef <gilad@...yossef.com>
>
> The driver that is mapping the IV directly should be fixed instead.
> Only input that is given in the form of SG lists can be mapped.
> Everything else should be copied if they need to go over DMA.

Got it. Will do.

Thanks,
Gilad

>
> Cheers,
> --
> Email: Herbert Xu <herbert@...dor.apana.org.au>
> Home Page: http://gondor.apana.org.au/~herbert/
> PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt



-- 
Gilad Ben-Yossef
Chief Coffee Drinker

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