linux-kernel - [PATCH v2] crypto: s5p: update iv after AES-CBC op end

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Date:   Tue, 19 Feb 2019 17:02:32 +0100
From:   Kamil Konieczny <k.konieczny@...tner.samsung.com>
To:     k.konieczny@...tner.samsung.com
Cc:     Krzysztof Kozlowski <krzk@...nel.org>,
        Vladimir Zapolskiy <vz@...ia.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Biggers <ebiggers@...nel.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        linux-crypto@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2] crypto: s5p: update iv after AES-CBC op end

Fix bug "s5p-sss crypto driver doesn't set next AES-CBC IV". While at this,
fix also AES-CTR mode. Tested on Odroid U3 with Eric Biggers branch
"iv-out-testing".

Signed-off-by: Kamil Konieczny <k.konieczny@...tner.samsung.com>
Reported-by: Eric Biggers <ebiggers@...nel.org>
---
Changes since v1:
 - reworded Subject and commit message
 - changed code according to comments by Krzysztof Kozlowski
 - added Reported-by line
---
 drivers/crypto/s5p-sss.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/crypto/s5p-sss.c b/drivers/crypto/s5p-sss.c
index 0064be0e3941..30b4f1015d8f 100644
--- a/drivers/crypto/s5p-sss.c
+++ b/drivers/crypto/s5p-sss.c
@@ -463,6 +463,9 @@ static void s5p_sg_copy_buf(void *buf, struct scatterlist *sg,
 
 static void s5p_sg_done(struct s5p_aes_dev *dev)
 {
+	struct ablkcipher_request *req = dev->req;
+	struct s5p_aes_reqctx *reqctx = ablkcipher_request_ctx(req);
+
 	if (dev->sg_dst_cpy) {
 		dev_dbg(dev->dev,
 			"Copying %d bytes of output data back to original place\n",
@@ -472,6 +475,11 @@ static void s5p_sg_done(struct s5p_aes_dev *dev)
 	}
 	s5p_free_sg_cpy(dev, &dev->sg_src_cpy);
 	s5p_free_sg_cpy(dev, &dev->sg_dst_cpy);
+	if (reqctx->mode & FLAGS_AES_CBC)
+		memcpy_fromio(req->info, dev->aes_ioaddr + SSS_REG_AES_IV_DATA(0), AES_BLOCK_SIZE);
+
+	else if (reqctx->mode & FLAGS_AES_CTR)
+		memcpy_fromio(req->info, dev->aes_ioaddr + SSS_REG_AES_CNT_DATA(0), AES_BLOCK_SIZE);
 }
 
 /* Calls the completion. Cannot be called with dev->lock hold. */
-- 
2.20.1