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From: Ard Biesheuvel <ardb@kernel.org>
To: linux-crypto@vger.kernel.org
Cc: Eric Biggers <ebiggers@google.com>,
	Tom Lendacky <thomas.lendacky@amd.com>,
	Jamie Iles <jamie@jamieiles.com>,
	Herbert Xu <herbert@gondor.apana.org.au>,
	Rohit Maheshwari <rohitm@chelsio.com>,
	Fabio Estevam <festevam@gmail.com>,
	Sascha Hauer <s.hauer@pengutronix.de>,
	Vinay Kumar Yadav <vinay.yadav@chelsio.com>,
	Maxime Ripard <mripard@kernel.org>,
	"David S. Miller" <davem@davemloft.net>,
	Chen-Yu Tsai <wens@csie.org>,
	Corentin Labbe <clabbe.montjoie@gmail.com>,
	NXP Linux Team <linux-imx@nxp.com>,
	Pengutronix Kernel Team <kernel@pengutronix.de>,
	Ayush Sawal <ayush.sawal@chelsio.com>,
	linux-amlogic@lists.infradead.org, linux-omap@vger.kernel.org,
	Shawn Guo <shawnguo@kernel.org>, Ard Biesheuvel <ardb@kernel.org>,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH 05/12] crypto: sun8i-ce - permit asynchronous skcipher as fallback
Date: Thu, 25 Jun 2020 14:42:46 +0200
Message-ID: <20200625124253.1906557-6-ardb@kernel.org> (raw)
In-Reply-To: <20200625124253.1906557-1-ardb@kernel.org>

Even though the sun8i-ce driver implements asynchronous versions of
ecb(aes) and cbc(aes), the fallbacks it allocates are required to be
synchronous. Given that SIMD based software implementations are usually
asynchronous as well, even though they rarely complete asynchronously
(this typically only happens in cases where the request was made from
softirq context, while SIMD was already in use in the task context that
it interrupted), these implementations are disregarded, and either the
generic C version or another table based version implemented in assembler
is selected instead.

Since falling back to synchronous AES is not only a performance issue, but
potentially a security issue as well (due to the fact that table based AES
is not time invariant), let's fix this, by allocating an ordinary skcipher
as the fallback, and invoke it with the completion routine that was given
to the outer request.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
 drivers/crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c | 41 ++++++++++----------
 drivers/crypto/allwinner/sun8i-ce/sun8i-ce.h        |  3 +-
 2 files changed, 22 insertions(+), 22 deletions(-)

diff --git a/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c b/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c
index a6abb701bfc6..82c99da24dfd 100644
--- a/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c
+++ b/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c
@@ -58,23 +58,20 @@ static int sun8i_ce_cipher_fallback(struct skcipher_request *areq)
 #ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG
 	struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
 	struct sun8i_ce_alg_template *algt;
-#endif
-	SYNC_SKCIPHER_REQUEST_ON_STACK(subreq, op->fallback_tfm);
 
-#ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG
 	algt = container_of(alg, struct sun8i_ce_alg_template, alg.skcipher);
 	algt->stat_fb++;
 #endif
 
-	skcipher_request_set_sync_tfm(subreq, op->fallback_tfm);
-	skcipher_request_set_callback(subreq, areq->base.flags, NULL, NULL);
-	skcipher_request_set_crypt(subreq, areq->src, areq->dst,
+	skcipher_request_set_tfm(&rctx->fallback_req, op->fallback_tfm);
+	skcipher_request_set_callback(&rctx->fallback_req, areq->base.flags,
+				      areq->base.complete, areq->base.data);
+	skcipher_request_set_crypt(&rctx->fallback_req, areq->src, areq->dst,
 				   areq->cryptlen, areq->iv);
 	if (rctx->op_dir & CE_DECRYPTION)
-		err = crypto_skcipher_decrypt(subreq);
+		err = crypto_skcipher_decrypt(&rctx->fallback_req);
 	else
-		err = crypto_skcipher_encrypt(subreq);
-	skcipher_request_zero(subreq);
+		err = crypto_skcipher_encrypt(&rctx->fallback_req);
 	return err;
 }
 
@@ -335,18 +332,20 @@ int sun8i_ce_cipher_init(struct crypto_tfm *tfm)
 	algt = container_of(alg, struct sun8i_ce_alg_template, alg.skcipher);
 	op->ce = algt->ce;
 
-	sktfm->reqsize = sizeof(struct sun8i_cipher_req_ctx);
-
-	op->fallback_tfm = crypto_alloc_sync_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK);
+	op->fallback_tfm = crypto_alloc_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK);
 	if (IS_ERR(op->fallback_tfm)) {
 		dev_err(op->ce->dev, "ERROR: Cannot allocate fallback for %s %ld\n",
 			name, PTR_ERR(op->fallback_tfm));
 		return PTR_ERR(op->fallback_tfm);
 	}
 
+	sktfm->reqsize = sizeof(struct sun8i_cipher_req_ctx) +
+			 crypto_skcipher_reqsize(op->fallback_tfm);
+
+
 	dev_info(op->ce->dev, "Fallback for %s is %s\n",
 		 crypto_tfm_alg_driver_name(&sktfm->base),
-		 crypto_tfm_alg_driver_name(crypto_skcipher_tfm(&op->fallback_tfm->base)));
+		 crypto_tfm_alg_driver_name(crypto_skcipher_tfm(op->fallback_tfm)));
 
 	op->enginectx.op.do_one_request = sun8i_ce_handle_cipher_request;
 	op->enginectx.op.prepare_request = NULL;
@@ -358,7 +357,7 @@ int sun8i_ce_cipher_init(struct crypto_tfm *tfm)
 
 	return 0;
 error_pm:
-	crypto_free_sync_skcipher(op->fallback_tfm);
+	crypto_free_skcipher(op->fallback_tfm);
 	return err;
 }
 
@@ -370,7 +369,7 @@ void sun8i_ce_cipher_exit(struct crypto_tfm *tfm)
 		memzero_explicit(op->key, op->keylen);
 		kfree(op->key);
 	}
-	crypto_free_sync_skcipher(op->fallback_tfm);
+	crypto_free_skcipher(op->fallback_tfm);
 	pm_runtime_put_sync_suspend(op->ce->dev);
 }
 
@@ -400,10 +399,10 @@ int sun8i_ce_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
 	if (!op->key)
 		return -ENOMEM;
 
-	crypto_sync_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK);
-	crypto_sync_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK);
+	crypto_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK);
+	crypto_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK);
 
-	return crypto_sync_skcipher_setkey(op->fallback_tfm, key, keylen);
+	return crypto_skcipher_setkey(op->fallback_tfm, key, keylen);
 }
 
 int sun8i_ce_des3_setkey(struct crypto_skcipher *tfm, const u8 *key,
@@ -425,8 +424,8 @@ int sun8i_ce_des3_setkey(struct crypto_skcipher *tfm, const u8 *key,
 	if (!op->key)
 		return -ENOMEM;
 
-	crypto_sync_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK);
-	crypto_sync_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK);
+	crypto_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK);
+	crypto_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK);
 
-	return crypto_sync_skcipher_setkey(op->fallback_tfm, key, keylen);
+	return crypto_skcipher_setkey(op->fallback_tfm, key, keylen);
 }
diff --git a/drivers/crypto/allwinner/sun8i-ce/sun8i-ce.h b/drivers/crypto/allwinner/sun8i-ce/sun8i-ce.h
index 0e9eac397e1b..4ac0f91e2800 100644
--- a/drivers/crypto/allwinner/sun8i-ce/sun8i-ce.h
+++ b/drivers/crypto/allwinner/sun8i-ce/sun8i-ce.h
@@ -187,6 +187,7 @@ struct sun8i_ce_dev {
 struct sun8i_cipher_req_ctx {
 	u32 op_dir;
 	int flow;
+	struct skcipher_request fallback_req;   // keep at the end
 };
 
 /*
@@ -202,7 +203,7 @@ struct sun8i_cipher_tfm_ctx {
 	u32 *key;
 	u32 keylen;
 	struct sun8i_ce_dev *ce;
-	struct crypto_sync_skcipher *fallback_tfm;
+	struct crypto_skcipher *fallback_tfm;
 };
 
 /*
-- 
2.27.0


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  parent reply index

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-25 12:42 [PATCH 00/12] crypto: permit asynchronous skciphers as driver fallbacks Ard Biesheuvel
2020-06-25 12:42 ` [PATCH 01/12] crypto: amlogic-gxl - default to build as module Ard Biesheuvel
2020-06-25 12:42 ` [PATCH 02/12] crypto: amlogic-gxl - permit async skcipher as fallback Ard Biesheuvel
2020-06-25 12:42 ` [PATCH 03/12] crypto: omap-aes - permit asynchronous " Ard Biesheuvel
2020-06-25 12:42 ` [PATCH 04/12] crypto: sun4i " Ard Biesheuvel
2020-06-25 12:42 ` Ard Biesheuvel [this message]
2020-06-25 12:42 ` [PATCH 06/12] crypto: sun8i-ss " Ard Biesheuvel
2020-06-25 12:42 ` [PATCH 07/12] crypto: ccp " Ard Biesheuvel
2020-06-25 16:24   ` kernel test robot
2020-06-25 12:42 ` [PATCH 08/12] crypto: chelsio " Ard Biesheuvel
2020-06-25 12:42 ` [PATCH 09/12] crypto: mxs-dcp " Ard Biesheuvel
2020-06-25 12:42 ` [PATCH 10/12] crypto: picoxcell " Ard Biesheuvel
2020-06-25 12:42 ` [PATCH 11/12] crypto: qce " Ard Biesheuvel
2020-06-25 12:42 ` [PATCH 12/12] crypto: sahara " Ard Biesheuvel

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