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Date:   Wed, 17 Jun 2020 11:11:07 -0400 (EDT)
From:   Mikulas Patocka <mpatocka@redhat.com>
To:     Eric Biggers <ebiggers@kernel.org>
cc:     Herbert Xu <herbert@gondor.apana.org.au>,
        Mike Snitzer <msnitzer@redhat.com>,
        linux-kernel@vger.kernel.org, dm-devel@redhat.com,
        linux-crypto@vger.kernel.org,
        "David S. Miller" <davem@davemloft.net>,
        Milan Broz <mbroz@redhat.com>,
        Jonathan Cameron <Jonathan.Cameron@Huawei.com>,
        George Cherian <gcherian@marvell.com>,
        Wei Xu <xuwei5@hisilicon.com>, Zaibo Xu <xuzaibo@Huawei.com>
Subject: [PATCH 3/3] dm-crypt: don't use drivers that have
 CRYPTO_ALG_ALLOCATES_MEMORY
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Message-ID: <alpine.LRH.2.02.2006171110270.18714@file01.intranet.prod.int.rdu2.redhat.com>
References: <alpine.LRH.2.02.2006091259250.30590@file01.intranet.prod.int.rdu2.redhat.com> <20200610010450.GA6449@gondor.apana.org.au> <alpine.LRH.2.02.2006100756270.27811@file01.intranet.prod.int.rdu2.redhat.com> <20200610121106.GA23137@gondor.apana.org.au>
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Don't use crypto drivers that have the flag CRYPTO_ALG_ALLOCATES_MEMORY
set. These drivers allocate memory and thus they are unsuitable for block
I/O processing.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

---
 drivers/md/dm-crypt.c |   17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

Index: linux-2.6/drivers/md/dm-crypt.c
===================================================================
--- linux-2.6.orig/drivers/md/dm-crypt.c
+++ linux-2.6/drivers/md/dm-crypt.c
@@ -419,7 +419,8 @@ static int crypt_iv_lmk_ctr(struct crypt
 		return -EINVAL;
 	}
 
-	lmk->hash_tfm = crypto_alloc_shash("md5", 0, 0);
+	lmk->hash_tfm = crypto_alloc_shash("md5", 0,
+					   CRYPTO_ALG_ALLOCATES_MEMORY);
 	if (IS_ERR(lmk->hash_tfm)) {
 		ti->error = "Error initializing LMK hash";
 		return PTR_ERR(lmk->hash_tfm);
@@ -581,7 +582,8 @@ static int crypt_iv_tcw_ctr(struct crypt
 		return -EINVAL;
 	}
 
-	tcw->crc32_tfm = crypto_alloc_shash("crc32", 0, 0);
+	tcw->crc32_tfm = crypto_alloc_shash("crc32", 0,
+					    CRYPTO_ALG_ALLOCATES_MEMORY);
 	if (IS_ERR(tcw->crc32_tfm)) {
 		ti->error = "Error initializing CRC32 in TCW";
 		return PTR_ERR(tcw->crc32_tfm);
@@ -768,7 +770,8 @@ static int crypt_iv_elephant_ctr(struct
 	struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant;
 	int r;
 
-	elephant->tfm = crypto_alloc_skcipher("ecb(aes)", 0, 0);
+	elephant->tfm = crypto_alloc_skcipher("ecb(aes)", 0,
+					      CRYPTO_ALG_ALLOCATES_MEMORY);
 	if (IS_ERR(elephant->tfm)) {
 		r = PTR_ERR(elephant->tfm);
 		elephant->tfm = NULL;
@@ -2088,7 +2091,8 @@ static int crypt_alloc_tfms_skcipher(str
 		return -ENOMEM;
 
 	for (i = 0; i < cc->tfms_count; i++) {
-		cc->cipher_tfm.tfms[i] = crypto_alloc_skcipher(ciphermode, 0, 0);
+		cc->cipher_tfm.tfms[i] = crypto_alloc_skcipher(ciphermode, 0,
+						CRYPTO_ALG_ALLOCATES_MEMORY);
 		if (IS_ERR(cc->cipher_tfm.tfms[i])) {
 			err = PTR_ERR(cc->cipher_tfm.tfms[i]);
 			crypt_free_tfms(cc);
@@ -2114,7 +2118,8 @@ static int crypt_alloc_tfms_aead(struct
 	if (!cc->cipher_tfm.tfms)
 		return -ENOMEM;
 
-	cc->cipher_tfm.tfms_aead[0] = crypto_alloc_aead(ciphermode, 0, 0);
+	cc->cipher_tfm.tfms_aead[0] = crypto_alloc_aead(ciphermode, 0,
+						CRYPTO_ALG_ALLOCATES_MEMORY);
 	if (IS_ERR(cc->cipher_tfm.tfms_aead[0])) {
 		err = PTR_ERR(cc->cipher_tfm.tfms_aead[0]);
 		crypt_free_tfms(cc);
@@ -2565,7 +2570,7 @@ static int crypt_ctr_auth_cipher(struct
 		return -ENOMEM;
 	strncpy(mac_alg, start, end - start);
 
-	mac = crypto_alloc_ahash(mac_alg, 0, 0);
+	mac = crypto_alloc_ahash(mac_alg, 0, CRYPTO_ALG_ALLOCATES_MEMORY);
 	kfree(mac_alg);
 
 	if (IS_ERR(mac))