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Date:   Sun, 22 Oct 2017 09:26:59 +0200
From:   Corentin Labbe <clabbe.montjoie@gmail.com>
To:     Fabien Dessenne <fabien.dessenne@st.com>
Cc:     Herbert Xu <herbert@gondor.apana.org.au>,
        "David S . Miller" <davem@davemloft.net>,
        Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Maxime Coquelin <mcoquelin.stm32@gmail.com>,
        Alexandre Torgue <alexandre.torgue@st.com>,
        linux-crypto@vger.kernel.org, devicetree@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        Lionel Debieve <lionel.debieve@st.com>,
        Benjamin Gaignard <benjamin.gaignard@st.com>,
        Ludovic Barre <ludovic.barre@st.com>
Subject: Re: [PATCH v5 2/2] crypto: stm32 - Support for STM32 CRYP crypto
 module
Message-ID: <20171022072659.GB8489@Red>
References: <1508425830-13565-1-git-send-email-fabien.dessenne@st.com>
 <1508425830-13565-3-git-send-email-fabien.dessenne@st.com>
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On Thu, Oct 19, 2017 at 05:10:30PM +0200, Fabien Dessenne wrote:
> This module registers block cipher algorithms that make use of the
> STMicroelectronics STM32 crypto "CRYP1" hardware.
> The following algorithms are supported:
> - aes: ecb, cbc, ctr
> - des: ecb, cbc
> - tdes: ecb, cbc
> 
> Signed-off-by: Fabien Dessenne <fabien.dessenne@st.com>
> ---
>  drivers/crypto/stm32/Kconfig      |    9 +
>  drivers/crypto/stm32/Makefile     |    3 +-
>  drivers/crypto/stm32/stm32-cryp.c | 1172 +++++++++++++++++++++++++++++++++++++
>  3 files changed, 1183 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/crypto/stm32/stm32-cryp.c
> 
> diff --git a/drivers/crypto/stm32/Kconfig b/drivers/crypto/stm32/Kconfig
> +static void stm32_cryp_irq_write_block(struct stm32_cryp *cryp)
> +{
> +	unsigned int i, j;
> +	u32 *src;
> +	u8 d8[4];
> +
> +	src = sg_virt(cryp->in_sg) + _walked_in;
> +
> +	for (i = 0; i < cryp->hw_blocksize / sizeof(u32); i++) {
> +		if (likely(cryp->total_in >= sizeof(u32))) {
> +			/* Write a full u32 */
> +			stm32_cryp_write(cryp, CRYP_DIN, *src);

Hello

Try also to test your driver with userspace via AF_ALG (libkcapi is a good start).
It should probably crash here.
I have do the same on my first sunxi-ss driver and you should use kmap().

Regards

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