From: Kamil Konieczny <k.konieczny@partner.samsung.com>
To: Ard Biesheuvel <ard.biesheuvel@linaro.org>, linux-crypto@vger.kernel.org
Cc: herbert@gondor.apana.org.au,
Krzysztof Kozlowski <krzk@kernel.org>,
Vladimir Zapolskiy <vz@mleia.com>,
linux-samsung-soc@vger.kernel.org
Subject: Re: [PATCH 1/2] crypto: s5p - deal gracefully with bogus input sizes
Date: Tue, 20 Aug 2019 11:51:15 +0200 [thread overview]
Message-ID: <e0eec29e-d869-0d58-75d9-1e2118b649ef@partner.samsung.com> (raw)
In-Reply-To: <20190819142226.1703-2-ard.biesheuvel@linaro.org>
On 19.08.2019 16:22, Ard Biesheuvel wrote:
> The s5p skcipher driver returns -EINVAL for zero length inputs, which
> deviates from the behavior of the generic ECB template, and causes fuzz
> tests to fail. In cases where the input is not a multiple of the AES
> block size (and the chaining mode is not CTR), it prints an error to
> the kernel log, which is a thing we usually try to avoid in response
> to situations that can be triggered by unprivileged users.
>
> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
> ---
> drivers/crypto/s5p-sss.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/crypto/s5p-sss.c b/drivers/crypto/s5p-sss.c
> index 9ef25230c199..ef90c58edb1f 100644
> --- a/drivers/crypto/s5p-sss.c
> +++ b/drivers/crypto/s5p-sss.c
> @@ -2056,9 +2056,12 @@ static int s5p_aes_crypt(struct ablkcipher_request *req, unsigned long mode)
> struct s5p_aes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
> struct s5p_aes_dev *dev = ctx->dev;
>
> + if (!req->nbytes)
> + return 0;
> +
> if (!IS_ALIGNED(req->nbytes, AES_BLOCK_SIZE) &&
> ((mode & FLAGS_AES_MODE_MASK) != FLAGS_AES_CTR)) {
> - dev_err(dev->dev, "request size is not exact amount of AES blocks\n");
> + dev_dbg(dev->dev, "request size is not exact amount of AES blocks\n");
> return -EINVAL;
> }
Acked-by: Kamil Konieczny <k.konieczny@partner.samsung.com>
--
Best regards,
Kamil Konieczny
Samsung R&D Institute Poland
next prev parent reply other threads:[~2019-08-20 9:51 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-19 14:22 [PATCH 0/2] drivers/crypto - s5p fixes Ard Biesheuvel
2019-08-19 14:22 ` [PATCH 1/2] crypto: s5p - deal gracefully with bogus input sizes Ard Biesheuvel
2019-08-20 9:51 ` Kamil Konieczny [this message]
2019-08-20 10:07 ` Krzysztof Kozlowski
2019-08-19 14:22 ` [PATCH 2/2] crypto: s5p - use correct block size of 1 for ctr(aes) Ard Biesheuvel
2019-08-20 9:51 ` Kamil Konieczny
2019-08-20 10:24 ` Krzysztof Kozlowski
2019-08-20 10:57 ` Ard Biesheuvel
2019-08-20 11:23 ` Krzysztof Kozlowski
2019-08-20 11:39 ` Kamil Konieczny
2019-08-20 11:48 ` Krzysztof Kozlowski
2019-08-20 12:28 ` Kamil Konieczny
2019-08-30 8:19 ` [PATCH 0/2] drivers/crypto - s5p fixes Herbert Xu
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