linux-kernel - [PATCH v6 06/11] crypto: qce: skcipher: Return error for non-blocksize data(ECB/CBC algorithms)

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Date:   Sun,  7 Feb 2021 09:39:41 -0500
From:   Thara Gopinath <thara.gopinath@...aro.org>
To:     herbert@...dor.apana.org.au, davem@...emloft.net,
        bjorn.andersson@...aro.org
Cc:     ebiggers@...gle.com, ardb@...nel.org, sivaprak@...eaurora.org,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v6 06/11] crypto: qce: skcipher: Return error for non-blocksize data(ECB/CBC algorithms)

ECB/CBC encryption/decryption requires the data to be blocksize aligned.
Crypto engine hangs on non-block sized operations for these algorithms.
Return invalid data if data size is not blocksize aligned for these
algorithms.

Signed-off-by: Thara Gopinath <thara.gopinath@...aro.org>
---

v5->v6:
	- Remove the wrong TODO which implied that AES CBC can do partial
	  block sizes when it is actually CTS mode that can as pointed
	  out by Eric Biggers.

 drivers/crypto/qce/skcipher.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/crypto/qce/skcipher.c b/drivers/crypto/qce/skcipher.c
index 96af40c2c8f3..d24d96ed5be9 100644
--- a/drivers/crypto/qce/skcipher.c
+++ b/drivers/crypto/qce/skcipher.c
@@ -254,6 +254,7 @@ static int qce_skcipher_crypt(struct skcipher_request *req, int encrypt)
 	struct qce_cipher_ctx *ctx = crypto_skcipher_ctx(tfm);
 	struct qce_cipher_reqctx *rctx = skcipher_request_ctx(req);
 	struct qce_alg_template *tmpl = to_cipher_tmpl(tfm);
+	unsigned int blocksize = crypto_skcipher_blocksize(tfm);
 	int keylen;
 	int ret;
 
@@ -265,6 +266,14 @@ static int qce_skcipher_crypt(struct skcipher_request *req, int encrypt)
 	if (!req->cryptlen)
 		return 0;
 
+	/*
+	 * ECB and CBC algorithms require message lengths to be
+	 * multiples of block size.
+	 */
+	if (IS_ECB(rctx->flags) || IS_CBC(rctx->flags))
+		if (!IS_ALIGNED(req->cryptlen, blocksize))
+			return -EINVAL;
+
 	/* qce is hanging when AES-XTS request len > QCE_SECTOR_SIZE and
 	 * is not a multiple of it; pass such requests to the fallback
 	 */
-- 
2.25.1