[PATCH v2] crypto: qat - check cipher length for aead AES-CBC-HMAC-SHA

[PATCH v2] crypto: qat - check cipher length for aead AES-CBC-HMAC-SHA

[Giovanni Cabiddu]

From: Dominik Przychodni <dominik.przychodni@intel.com>

Return -EINVAL for authenc(hmac(sha1),cbc(aes)),
authenc(hmac(sha256),cbc(aes)) and authenc(hmac(sha512),cbc(aes))
if the cipher length is not multiple of the AES block.
This is to prevent an undefined device behaviour.

Fixes: d370cec32194 ("crypto: qat - Intel(R) QAT crypto interface")
Signed-off-by: Dominik Przychodni <dominik.przychodni@intel.com>
[giovanni.cabiddu@intel.com: reworded commit message]
Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
---
 drivers/crypto/qat/qat_common/qat_algs.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/crypto/qat/qat_common/qat_algs.c b/drivers/crypto/qat/qat_common/qat_algs.c
index 72753b84dc95..d552dbcfe0a0 100644
--- a/drivers/crypto/qat/qat_common/qat_algs.c
+++ b/drivers/crypto/qat/qat_common/qat_algs.c
@@ -828,6 +828,11 @@ static int qat_alg_aead_dec(struct aead_request *areq)
 	struct icp_qat_fw_la_bulk_req *msg;
 	int digst_size = crypto_aead_authsize(aead_tfm);
 	int ret, ctr = 0;
+	u32 cipher_len;
+
+	cipher_len = areq->cryptlen - digst_size;
+	if (cipher_len % AES_BLOCK_SIZE != 0)
+		return -EINVAL;
 
 	ret = qat_alg_sgl_to_bufl(ctx->inst, areq->src, areq->dst, qat_req);
 	if (unlikely(ret))
@@ -842,7 +847,7 @@ static int qat_alg_aead_dec(struct aead_request *areq)
 	qat_req->req.comn_mid.src_data_addr = qat_req->buf.blp;
 	qat_req->req.comn_mid.dest_data_addr = qat_req->buf.bloutp;
 	cipher_param = (void *)&qat_req->req.serv_specif_rqpars;
-	cipher_param->cipher_length = areq->cryptlen - digst_size;
+	cipher_param->cipher_length = cipher_len;
 	cipher_param->cipher_offset = areq->assoclen;
 	memcpy(cipher_param->u.cipher_IV_array, areq->iv, AES_BLOCK_SIZE);
 	auth_param = (void *)((u8 *)cipher_param + sizeof(*cipher_param));
@@ -871,6 +876,9 @@ static int qat_alg_aead_enc(struct aead_request *areq)
 	u8 *iv = areq->iv;
 	int ret, ctr = 0;
 
+	if (areq->cryptlen % AES_BLOCK_SIZE != 0)
+		return -EINVAL;
+
 	ret = qat_alg_sgl_to_bufl(ctx->inst, areq->src, areq->dst, qat_req);
 	if (unlikely(ret))
 		return ret;
-- 
2.26.2

Re: [PATCH v2] crypto: qat - check cipher length for aead AES-CBC-HMAC-SHA

[Herbert Xu]

On Mon, Aug 31, 2020 at 11:59:59AM +0100, Giovanni Cabiddu wrote:
> From: Dominik Przychodni <dominik.przychodni@intel.com>
> 
> Return -EINVAL for authenc(hmac(sha1),cbc(aes)),
> authenc(hmac(sha256),cbc(aes)) and authenc(hmac(sha512),cbc(aes))
> if the cipher length is not multiple of the AES block.
> This is to prevent an undefined device behaviour.
> 
> Fixes: d370cec32194 ("crypto: qat - Intel(R) QAT crypto interface")
> Signed-off-by: Dominik Przychodni <dominik.przychodni@intel.com>
> [giovanni.cabiddu@intel.com: reworded commit message]
> Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
> ---
>  drivers/crypto/qat/qat_common/qat_algs.c | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)

Patch applied.  Thanks.
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt