Linux-Crypto Archive on lore.kernel.org
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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Arnd Bergmann <arnd@arndb.de>,
	Gilad Ben-Yossef <gilad@benyossef.com>,
	Herbert Xu <herbert@gondor.apana.org.au>,
	Sasha Levin <sashal@kernel.org>,
	linux-crypto@vger.kernel.org, clang-built-linux@googlegroups.com
Subject: [PATCH AUTOSEL 4.19 253/671] crypto: ccree - reduce kernel stack usage with clang
Date: Thu, 16 Jan 2020 11:52:42 -0500
Message-ID: <20200116165940.10720-136-sashal@kernel.org> (raw)
In-Reply-To: <20200116165940.10720-1-sashal@kernel.org>

From: Arnd Bergmann <arnd@arndb.de>

[ Upstream commit 5db46ac29a6797541943d3c4081821747e342732 ]

Building with clang for a 32-bit architecture runs over the stack
frame limit in the setkey function:

drivers/crypto/ccree/cc_cipher.c:318:12: error: stack frame size of 1152 bytes in function 'cc_cipher_setkey' [-Werror,-Wframe-larger-than=]

The problem is that there are two large variables: the temporary
'tmp' array and the SHASH_DESC_ON_STACK() declaration. Moving
the first into the block in which it is used reduces the
total frame size to 768 bytes, which seems more reasonable
and is under the warning limit.

Fixes: 63ee04c8b491 ("crypto: ccree - add skcipher support")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-By: Gilad Ben-Yossef <gilad@benyossef.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/crypto/ccree/cc_cipher.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/crypto/ccree/cc_cipher.c b/drivers/crypto/ccree/cc_cipher.c
index 54a39164aab8..28a5b8b38fa2 100644
--- a/drivers/crypto/ccree/cc_cipher.c
+++ b/drivers/crypto/ccree/cc_cipher.c
@@ -306,7 +306,6 @@ static int cc_cipher_setkey(struct crypto_skcipher *sktfm, const u8 *key,
 	struct crypto_tfm *tfm = crypto_skcipher_tfm(sktfm);
 	struct cc_cipher_ctx *ctx_p = crypto_tfm_ctx(tfm);
 	struct device *dev = drvdata_to_dev(ctx_p->drvdata);
-	u32 tmp[DES3_EDE_EXPKEY_WORDS];
 	struct cc_crypto_alg *cc_alg =
 			container_of(tfm->__crt_alg, struct cc_crypto_alg,
 				     skcipher_alg.base);
@@ -332,6 +331,7 @@ static int cc_cipher_setkey(struct crypto_skcipher *sktfm, const u8 *key,
 	 * HW does the expansion on its own.
 	 */
 	if (ctx_p->flow_mode == S_DIN_to_DES) {
+		u32 tmp[DES3_EDE_EXPKEY_WORDS];
 		if (keylen == DES3_EDE_KEY_SIZE &&
 		    __des3_ede_setkey(tmp, &tfm->crt_flags, key,
 				      DES3_EDE_KEY_SIZE)) {
-- 
2.20.1


      parent reply index

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200116165940.10720-1-sashal@kernel.org>
2020-01-16 16:50 ` [PATCH AUTOSEL 4.19 120/671] crypto: brcm - Fix some set-but-not-used warning Sasha Levin
2020-01-16 16:50 ` [PATCH AUTOSEL 4.19 121/671] crypto: tgr192 - fix unaligned memory access Sasha Levin
2020-01-16 16:50 ` [PATCH AUTOSEL 4.19 141/671] crypto: crypto4xx - Fix wrong ppc4xx_trng_probe()/ppc4xx_trng_remove() arguments Sasha Levin
2020-01-16 16:52 ` [PATCH AUTOSEL 4.19 228/671] hwrng: bcm2835 - fix probe as platform device Sasha Levin
2020-01-16 16:52 ` Sasha Levin [this message]

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