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From: Ard Biesheuvel <ardb@kernel.org>
To: linux-crypto@vger.kernel.org
Cc: Eric Biggers <ebiggers@google.com>,
	Corentin Labbe <clabbe.montjoie@gmail.com>,
	Ayush Sawal <ayush.sawal@chelsio.com>,
	Jamie Iles <jamie@jamieiles.com>,
	Fabio Estevam <festevam@gmail.com>,
	Ard Biesheuvel <ardb@kernel.org>,
	Herbert Xu <herbert@gondor.apana.org.au>,
	Rohit Maheshwari <rohitm@chelsio.com>,
	Chen-Yu Tsai <wens@csie.org>, NXP Linux Team <linux-imx@nxp.com>,
	Tom Lendacky <thomas.lendacky@amd.com>,
	Sascha Hauer <s.hauer@pengutronix.de>,
	Vinay Kumar Yadav <vinay.yadav@chelsio.com>,
	Maxime Ripard <mripard@kernel.org>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	linux-amlogic@lists.infradead.org, linux-omap@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	Tero Kristo <t-kristo@ti.com>,
	Pengutronix Kernel Team <kernel@pengutronix.de>,
	Shawn Guo <shawnguo@kernel.org>,
	"David S. Miller" <davem@davemloft.net>
Subject: [PATCH v2 03/13] crypto: omap-aes - permit asynchronous skcipher as fallback
Date: Sat, 27 Jun 2020 10:36:13 +0200
Message-ID: <20200627083623.2428333-4-ardb@kernel.org> (raw)
In-Reply-To: <20200627083623.2428333-1-ardb@kernel.org>

Even though the omap-aes driver implements asynchronous versions of
ecb(aes), cbc(aes) and ctr(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/omap-aes.c | 35 ++++++++++----------
 drivers/crypto/omap-aes.h |  3 +-
 2 files changed, 19 insertions(+), 19 deletions(-)

diff --git a/drivers/crypto/omap-aes.c b/drivers/crypto/omap-aes.c
index b5aff20c5900..25154b74dcc6 100644
--- a/drivers/crypto/omap-aes.c
+++ b/drivers/crypto/omap-aes.c
@@ -548,20 +548,18 @@ static int omap_aes_crypt(struct skcipher_request *req, unsigned long mode)
 		  !!(mode & FLAGS_CBC));
 
 	if (req->cryptlen < aes_fallback_sz) {
-		SYNC_SKCIPHER_REQUEST_ON_STACK(subreq, ctx->fallback);
-
-		skcipher_request_set_sync_tfm(subreq, ctx->fallback);
-		skcipher_request_set_callback(subreq, req->base.flags, NULL,
-					      NULL);
-		skcipher_request_set_crypt(subreq, req->src, req->dst,
-					   req->cryptlen, req->iv);
+		skcipher_request_set_tfm(&rctx->fallback_req, ctx->fallback);
+		skcipher_request_set_callback(&rctx->fallback_req,
+					      req->base.flags,
+					      req->base.complete,
+					      req->base.data);
+		skcipher_request_set_crypt(&rctx->fallback_req, req->src,
+					   req->dst, req->cryptlen, req->iv);
 
 		if (mode & FLAGS_ENCRYPT)
-			ret = crypto_skcipher_encrypt(subreq);
+			ret = crypto_skcipher_encrypt(&rctx->fallback_req);
 		else
-			ret = crypto_skcipher_decrypt(subreq);
-
-		skcipher_request_zero(subreq);
+			ret = crypto_skcipher_decrypt(&rctx->fallback_req);
 		return ret;
 	}
 	dd = omap_aes_find_dev(rctx);
@@ -590,11 +588,11 @@ static int omap_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
 	memcpy(ctx->key, key, keylen);
 	ctx->keylen = keylen;
 
-	crypto_sync_skcipher_clear_flags(ctx->fallback, CRYPTO_TFM_REQ_MASK);
-	crypto_sync_skcipher_set_flags(ctx->fallback, tfm->base.crt_flags &
+	crypto_skcipher_clear_flags(ctx->fallback, CRYPTO_TFM_REQ_MASK);
+	crypto_skcipher_set_flags(ctx->fallback, tfm->base.crt_flags &
 						 CRYPTO_TFM_REQ_MASK);
 
-	ret = crypto_sync_skcipher_setkey(ctx->fallback, key, keylen);
+	ret = crypto_skcipher_setkey(ctx->fallback, key, keylen);
 	if (!ret)
 		return 0;
 
@@ -640,15 +638,16 @@ static int omap_aes_init_tfm(struct crypto_skcipher *tfm)
 {
 	const char *name = crypto_tfm_alg_name(&tfm->base);
 	struct omap_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
-	struct crypto_sync_skcipher *blk;
+	struct crypto_skcipher *blk;
 
-	blk = crypto_alloc_sync_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK);
+	blk = crypto_alloc_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK);
 	if (IS_ERR(blk))
 		return PTR_ERR(blk);
 
 	ctx->fallback = blk;
 
-	crypto_skcipher_set_reqsize(tfm, sizeof(struct omap_aes_reqctx));
+	crypto_skcipher_set_reqsize(tfm, sizeof(struct omap_aes_reqctx) +
+					 crypto_skcipher_reqsize(blk));
 
 	ctx->enginectx.op.prepare_request = omap_aes_prepare_req;
 	ctx->enginectx.op.unprepare_request = NULL;
@@ -662,7 +661,7 @@ static void omap_aes_exit_tfm(struct crypto_skcipher *tfm)
 	struct omap_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
 
 	if (ctx->fallback)
-		crypto_free_sync_skcipher(ctx->fallback);
+		crypto_free_skcipher(ctx->fallback);
 
 	ctx->fallback = NULL;
 }
diff --git a/drivers/crypto/omap-aes.h b/drivers/crypto/omap-aes.h
index 2d111bf906e1..23d073e87bb8 100644
--- a/drivers/crypto/omap-aes.h
+++ b/drivers/crypto/omap-aes.h
@@ -97,7 +97,7 @@ struct omap_aes_ctx {
 	int		keylen;
 	u32		key[AES_KEYSIZE_256 / sizeof(u32)];
 	u8		nonce[4];
-	struct crypto_sync_skcipher	*fallback;
+	struct crypto_skcipher	*fallback;
 };
 
 struct omap_aes_gcm_ctx {
@@ -110,6 +110,7 @@ struct omap_aes_reqctx {
 	unsigned long mode;
 	u8 iv[AES_BLOCK_SIZE];
 	u32 auth_tag[AES_BLOCK_SIZE / sizeof(u32)];
+	struct skcipher_request fallback_req;	// keep at the end
 };
 
 #define OMAP_AES_QUEUE_LENGTH	1
-- 
2.27.0


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  parent reply index

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-27  8:36 [PATCH v2 00/13] crypto: permit asynchronous skciphers as driver fallbacks Ard Biesheuvel
2020-06-27  8:36 ` [PATCH v2 01/13] crypto: amlogic-gxl - default to build as module Ard Biesheuvel
2020-06-27  8:36 ` [PATCH v2 02/13] crypto: amlogic-gxl - permit async skcipher as fallback Ard Biesheuvel
2020-06-27  8:36 ` Ard Biesheuvel [this message]
2020-06-27  8:36 ` [PATCH v2 04/13] crypto: sun4i - permit asynchronous " Ard Biesheuvel
2020-06-27  8:36 ` [PATCH v2 05/13] crypto: sun8i-ce " Ard Biesheuvel
2020-06-27  8:36 ` [PATCH v2 06/13] crypto: sun8i-ss " Ard Biesheuvel
2020-06-27  8:36 ` [PATCH v2 07/13] crypto: ccp " Ard Biesheuvel
2020-06-27  8:36 ` [PATCH v2 08/13] crypto: chelsio " Ard Biesheuvel
2020-06-27  8:36 ` [PATCH v2 09/13] crypto: mxs-dcp " Ard Biesheuvel
2020-06-27  8:36 ` [PATCH v2 10/13] crypto: picoxcell " Ard Biesheuvel
2020-06-27  8:36 ` [PATCH v2 11/13] crypto: qce " Ard Biesheuvel
2020-06-27  8:36 ` [PATCH v2 12/13] crypto: sahara " Ard Biesheuvel
2020-06-27  8:36 ` [PATCH v2 13/13] crypto: mediatek - use AES library for GCM key derivation Ard Biesheuvel

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