diff mbox series

[2/4] crypto: pass the flag CRYPTO_ALG_ALLOCATES_MEMORY

Message ID alpine.LRH.2.02.2006161101380.28052@file01.intranet.prod.int.rdu2.redhat.com (mailing list archive)
State Superseded
Delegated to: Herbert Xu
Headers show
Series [1/4] crypto: introduce CRYPTO_ALG_ALLOCATES_MEMORY | expand

Commit Message

Mikulas Patocka June 16, 2020, 3:01 p.m. UTC 
Pass the flag CRYPTO_ALG_ALLOCATES_MEMORY down through the crypto API.

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

---
 crypto/adiantum.c         |    3 ++-
 crypto/authenc.c          |    5 +++--
 crypto/authencesn.c       |    5 +++--
 crypto/ccm.c              |    7 ++++---
 crypto/chacha20poly1305.c |    5 +++--
 crypto/cryptd.c           |    7 +++++--
 crypto/ctr.c              |    3 ++-
 crypto/cts.c              |    5 +++--
 crypto/essiv.c            |    5 +++--
 crypto/gcm.c              |   15 +++++++++------
 crypto/geniv.c            |    3 ++-
 crypto/lrw.c              |    5 +++--
 crypto/rsa-pkcs1pad.c     |    5 +++--
 crypto/xts.c              |    2 +-
 include/crypto/algapi.h   |    9 +++++++++
 15 files changed, 55 insertions(+), 29 deletions(-)

Comments

Eric Biggers June 16, 2020, 5:42 p.m. UTC | #1 
On Tue, Jun 16, 2020 at 11:01:58AM -0400, Mikulas Patocka wrote:
> Pass the flag CRYPTO_ALG_ALLOCATES_MEMORY down through the crypto API.
> 
> Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
> 
> ---
>  crypto/adiantum.c         |    3 ++-
>  crypto/authenc.c          |    5 +++--
>  crypto/authencesn.c       |    5 +++--
>  crypto/ccm.c              |    7 ++++---
>  crypto/chacha20poly1305.c |    5 +++--
>  crypto/cryptd.c           |    7 +++++--
>  crypto/ctr.c              |    3 ++-
>  crypto/cts.c              |    5 +++--
>  crypto/essiv.c            |    5 +++--
>  crypto/gcm.c              |   15 +++++++++------
>  crypto/geniv.c            |    3 ++-
>  crypto/lrw.c              |    5 +++--
>  crypto/rsa-pkcs1pad.c     |    5 +++--
>  crypto/xts.c              |    2 +-
>  include/crypto/algapi.h   |    9 +++++++++
>  15 files changed, 55 insertions(+), 29 deletions(-)
> 
> Index: linux-2.6/crypto/authenc.c
> ===================================================================
> --- linux-2.6.orig/crypto/authenc.c
> +++ linux-2.6/crypto/authenc.c
> @@ -388,7 +388,8 @@ static int crypto_authenc_create(struct
>  	if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
>  		return -EINVAL;
>  
> -	mask = crypto_requires_sync(algt->type, algt->mask);
> +	mask = crypto_requires_sync(algt->type, algt->mask) |
> +	       crypto_requires_nomem(algt->type, algt->mask);
>  
>  	inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
>  	if (!inst)
> @@ -424,7 +425,7 @@ static int crypto_authenc_create(struct
>  		goto err_free_inst;
>  
>  	inst->alg.base.cra_flags = (auth_base->cra_flags |
> -				    enc->base.cra_flags) & CRYPTO_ALG_ASYNC;
> +				    enc->base.cra_flags) & (CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY);

ASYNC and ALLOCATES_MEMORY are both handled the same way.  They're both
"inherited" from inner algorithms to the template instance.  And if someone
requests that one of these flags be clear when instantiating a template, then we
have to honor the same for the inner algorithms too.

So, shouldn't we define something like crypto_algt_mask() and
CRYPTO_ALG_INHERITED_FLAGS and make them handle both ASYNC and ALLOCATES_MEMORY,
rather than explicitly handling each of these flags everywhere again?

- Eric
diff mbox series

Patch

Index: linux-2.6/crypto/authenc.c
===================================================================
--- linux-2.6.orig/crypto/authenc.c
+++ linux-2.6/crypto/authenc.c
@@ -388,7 +388,8 @@  static int crypto_authenc_create(struct
 	if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
 		return -EINVAL;
 
-	mask = crypto_requires_sync(algt->type, algt->mask);
+	mask = crypto_requires_sync(algt->type, algt->mask) |
+	       crypto_requires_nomem(algt->type, algt->mask);
 
 	inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
 	if (!inst)
@@ -424,7 +425,7 @@  static int crypto_authenc_create(struct
 		goto err_free_inst;
 
 	inst->alg.base.cra_flags = (auth_base->cra_flags |
-				    enc->base.cra_flags) & CRYPTO_ALG_ASYNC;
+				    enc->base.cra_flags) & (CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY);
 	inst->alg.base.cra_priority = enc->base.cra_priority * 10 +
 				      auth_base->cra_priority;
 	inst->alg.base.cra_blocksize = enc->base.cra_blocksize;
Index: linux-2.6/crypto/authencesn.c
===================================================================
--- linux-2.6.orig/crypto/authencesn.c
+++ linux-2.6/crypto/authencesn.c
@@ -406,7 +406,8 @@  static int crypto_authenc_esn_create(str
 	if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
 		return -EINVAL;
 
-	mask = crypto_requires_sync(algt->type, algt->mask);
+	mask = crypto_requires_sync(algt->type, algt->mask) |
+	       crypto_requires_nomem(algt->type, algt->mask);
 
 	inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
 	if (!inst)
@@ -438,7 +439,7 @@  static int crypto_authenc_esn_create(str
 		goto err_free_inst;
 
 	inst->alg.base.cra_flags = (auth_base->cra_flags |
-				    enc->base.cra_flags) & CRYPTO_ALG_ASYNC;
+				    enc->base.cra_flags) & (CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY);
 	inst->alg.base.cra_priority = enc->base.cra_priority * 10 +
 				      auth_base->cra_priority;
 	inst->alg.base.cra_blocksize = enc->base.cra_blocksize;
Index: linux-2.6/crypto/ccm.c
===================================================================
--- linux-2.6.orig/crypto/ccm.c
+++ linux-2.6/crypto/ccm.c
@@ -462,7 +462,8 @@  static int crypto_ccm_create_common(stru
 	if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
 		return -EINVAL;
 
-	mask = crypto_requires_sync(algt->type, algt->mask);
+	mask = crypto_requires_sync(algt->type, algt->mask) |
+	       crypto_requires_nomem(algt->type, algt->mask);
 
 	inst = kzalloc(sizeof(*inst) + sizeof(*ictx), GFP_KERNEL);
 	if (!inst)
@@ -507,7 +508,7 @@  static int crypto_ccm_create_common(stru
 		     mac->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 		goto err_free_inst;
 
-	inst->alg.base.cra_flags = ctr->base.cra_flags & CRYPTO_ALG_ASYNC;
+	inst->alg.base.cra_flags = ctr->base.cra_flags & (CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY);
 	inst->alg.base.cra_priority = (mac->base.cra_priority +
 				       ctr->base.cra_priority) / 2;
 	inst->alg.base.cra_blocksize = 1;
@@ -759,7 +760,7 @@  static int crypto_rfc4309_create(struct
 	    CRYPTO_MAX_ALG_NAME)
 		goto err_free_inst;
 
-	inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
+	inst->alg.base.cra_flags = alg->base.cra_flags & (CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY);
 	inst->alg.base.cra_priority = alg->base.cra_priority;
 	inst->alg.base.cra_blocksize = 1;
 	inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
Index: linux-2.6/crypto/chacha20poly1305.c
===================================================================
--- linux-2.6.orig/crypto/chacha20poly1305.c
+++ linux-2.6/crypto/chacha20poly1305.c
@@ -573,7 +573,8 @@  static int chachapoly_create(struct cryp
 	if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
 		return -EINVAL;
 
-	mask = crypto_requires_sync(algt->type, algt->mask);
+	mask = crypto_requires_sync(algt->type, algt->mask) |
+	       crypto_requires_nomem(algt->type, algt->mask);
 
 	inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
 	if (!inst)
@@ -614,7 +615,7 @@  static int chachapoly_create(struct cryp
 		goto err_free_inst;
 
 	inst->alg.base.cra_flags = (chacha->base.cra_flags |
-				    poly->base.cra_flags) & CRYPTO_ALG_ASYNC;
+				    poly->base.cra_flags) & (CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY);
 	inst->alg.base.cra_priority = (chacha->base.cra_priority +
 				       poly->base.cra_priority) / 2;
 	inst->alg.base.cra_blocksize = 1;
Index: linux-2.6/crypto/cryptd.c
===================================================================
--- linux-2.6.orig/crypto/cryptd.c
+++ linux-2.6/crypto/cryptd.c
@@ -396,6 +396,7 @@  static int cryptd_create_skcipher(struct
 		goto err_free_inst;
 
 	inst->alg.base.cra_flags = CRYPTO_ALG_ASYNC |
+				   (alg->base.cra_flags & CRYPTO_ALG_ALLOCATES_MEMORY) |
 				   (alg->base.cra_flags & CRYPTO_ALG_INTERNAL);
 
 	inst->alg.ivsize = crypto_skcipher_alg_ivsize(alg);
@@ -663,7 +664,8 @@  static int cryptd_create_hash(struct cry
 
 	inst->alg.halg.base.cra_flags = CRYPTO_ALG_ASYNC |
 		(alg->base.cra_flags & (CRYPTO_ALG_INTERNAL |
-					CRYPTO_ALG_OPTIONAL_KEY));
+					CRYPTO_ALG_OPTIONAL_KEY |
+					CRYPTO_ALG_ALLOCATES_MEMORY));
 
 	inst->alg.halg.digestsize = alg->digestsize;
 	inst->alg.halg.statesize = alg->statesize;
@@ -849,7 +851,8 @@  static int cryptd_create_aead(struct cry
 		goto err_free_inst;
 
 	inst->alg.base.cra_flags = CRYPTO_ALG_ASYNC |
-				   (alg->base.cra_flags & CRYPTO_ALG_INTERNAL);
+				   (alg->base.cra_flags & CRYPTO_ALG_INTERNAL) |
+				   (alg->base.cra_flags & CRYPTO_ALG_ALLOCATES_MEMORY);
 	inst->alg.base.cra_ctxsize = sizeof(struct cryptd_aead_ctx);
 
 	inst->alg.ivsize = crypto_aead_alg_ivsize(alg);
Index: linux-2.6/crypto/ctr.c
===================================================================
--- linux-2.6.orig/crypto/ctr.c
+++ linux-2.6/crypto/ctr.c
@@ -276,6 +276,7 @@  static int crypto_rfc3686_create(struct
 		return -ENOMEM;
 
 	mask = crypto_requires_sync(algt->type, algt->mask) |
+		crypto_requires_nomem(algt->type, algt->mask) |
 		crypto_requires_off(algt->type, algt->mask,
 				    CRYPTO_ALG_NEED_FALLBACK);
 
@@ -310,7 +311,7 @@  static int crypto_rfc3686_create(struct
 	inst->alg.base.cra_blocksize = 1;
 	inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
 
-	inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
+	inst->alg.base.cra_flags = alg->base.cra_flags & (CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY);
 
 	inst->alg.ivsize = CTR_RFC3686_IV_SIZE;
 	inst->alg.chunksize = crypto_skcipher_alg_chunksize(alg);
Index: linux-2.6/crypto/cts.c
===================================================================
--- linux-2.6.orig/crypto/cts.c
+++ linux-2.6/crypto/cts.c
@@ -337,7 +337,8 @@  static int crypto_cts_create(struct cryp
 	if ((algt->type ^ CRYPTO_ALG_TYPE_SKCIPHER) & algt->mask)
 		return -EINVAL;
 
-	mask = crypto_requires_sync(algt->type, algt->mask);
+	mask = crypto_requires_sync(algt->type, algt->mask) |
+	       crypto_requires_nomem(algt->type, algt->mask);
 
 	inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
 	if (!inst)
@@ -364,7 +365,7 @@  static int crypto_cts_create(struct cryp
 	if (err)
 		goto err_free_inst;
 
-	inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
+	inst->alg.base.cra_flags = alg->base.cra_flags & (CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY);
 	inst->alg.base.cra_priority = alg->base.cra_priority;
 	inst->alg.base.cra_blocksize = alg->base.cra_blocksize;
 	inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
Index: linux-2.6/crypto/essiv.c
===================================================================
--- linux-2.6.orig/crypto/essiv.c
+++ linux-2.6/crypto/essiv.c
@@ -468,7 +468,8 @@  static int essiv_create(struct crypto_te
 		return PTR_ERR(shash_name);
 
 	type = algt->type & algt->mask;
-	mask = crypto_requires_sync(algt->type, algt->mask);
+	mask = crypto_requires_sync(algt->type, algt->mask) |
+	       crypto_requires_nomem(algt->type, algt->mask);
 
 	switch (type) {
 	case CRYPTO_ALG_TYPE_SKCIPHER:
@@ -559,7 +560,7 @@  static int essiv_create(struct crypto_te
 		     hash_alg->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 		goto out_free_hash;
 
-	base->cra_flags		= block_base->cra_flags & CRYPTO_ALG_ASYNC;
+	base->cra_flags		= block_base->cra_flags & (CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY);
 	base->cra_blocksize	= block_base->cra_blocksize;
 	base->cra_ctxsize	= sizeof(struct essiv_tfm_ctx);
 	base->cra_alignmask	= block_base->cra_alignmask;
Index: linux-2.6/crypto/gcm.c
===================================================================
--- linux-2.6.orig/crypto/gcm.c
+++ linux-2.6/crypto/gcm.c
@@ -593,7 +593,8 @@  static int crypto_gcm_create_common(stru
 	if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
 		return -EINVAL;
 
-	mask = crypto_requires_sync(algt->type, algt->mask);
+	mask = crypto_requires_sync(algt->type, algt->mask) |
+	       crypto_requires_nomem(algt->type, algt->mask);
 
 	inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
 	if (!inst)
@@ -636,7 +637,7 @@  static int crypto_gcm_create_common(stru
 		goto err_free_inst;
 
 	inst->alg.base.cra_flags = (ghash->base.cra_flags |
-				    ctr->base.cra_flags) & CRYPTO_ALG_ASYNC;
+				    ctr->base.cra_flags) & (CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY);
 	inst->alg.base.cra_priority = (ghash->base.cra_priority +
 				       ctr->base.cra_priority) / 2;
 	inst->alg.base.cra_blocksize = 1;
@@ -849,7 +850,8 @@  static int crypto_rfc4106_create(struct
 	if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
 		return -EINVAL;
 
-	mask = crypto_requires_sync(algt->type, algt->mask);
+	mask = crypto_requires_sync(algt->type, algt->mask) |
+	       crypto_requires_nomem(algt->type, algt->mask);
 
 	inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
 	if (!inst)
@@ -882,7 +884,7 @@  static int crypto_rfc4106_create(struct
 	    CRYPTO_MAX_ALG_NAME)
 		goto err_free_inst;
 
-	inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
+	inst->alg.base.cra_flags = alg->base.cra_flags & (CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY);
 	inst->alg.base.cra_priority = alg->base.cra_priority;
 	inst->alg.base.cra_blocksize = 1;
 	inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
@@ -1071,7 +1073,8 @@  static int crypto_rfc4543_create(struct
 	if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
 		return -EINVAL;
 
-	mask = crypto_requires_sync(algt->type, algt->mask);
+	mask = crypto_requires_sync(algt->type, algt->mask) |
+	       crypto_requires_nomem(algt->type, algt->mask);
 
 	inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
 	if (!inst)
@@ -1104,7 +1107,7 @@  static int crypto_rfc4543_create(struct
 	    CRYPTO_MAX_ALG_NAME)
 		goto err_free_inst;
 
-	inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
+	inst->alg.base.cra_flags = alg->base.cra_flags & (CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY);
 	inst->alg.base.cra_priority = alg->base.cra_priority;
 	inst->alg.base.cra_blocksize = 1;
 	inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
Index: linux-2.6/crypto/geniv.c
===================================================================
--- linux-2.6.orig/crypto/geniv.c
+++ linux-2.6/crypto/geniv.c
@@ -64,6 +64,7 @@  struct aead_instance *aead_geniv_alloc(s
 
 	/* Ignore async algorithms if necessary. */
 	mask |= crypto_requires_sync(algt->type, algt->mask);
+	mask |= crypto_requires_nomem(algt->type, algt->mask);
 
 	err = crypto_grab_aead(spawn, aead_crypto_instance(inst),
 			       crypto_attr_alg_name(tb[1]), type, mask);
@@ -89,7 +90,7 @@  struct aead_instance *aead_geniv_alloc(s
 	    CRYPTO_MAX_ALG_NAME)
 		goto err_free_inst;
 
-	inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
+	inst->alg.base.cra_flags = alg->base.cra_flags & (CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY);
 	inst->alg.base.cra_priority = alg->base.cra_priority;
 	inst->alg.base.cra_blocksize = alg->base.cra_blocksize;
 	inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
Index: linux-2.6/crypto/lrw.c
===================================================================
--- linux-2.6.orig/crypto/lrw.c
+++ linux-2.6/crypto/lrw.c
@@ -311,7 +311,8 @@  static int create(struct crypto_template
 	if ((algt->type ^ CRYPTO_ALG_TYPE_SKCIPHER) & algt->mask)
 		return -EINVAL;
 
-	mask = crypto_requires_sync(algt->type, algt->mask);
+	mask = crypto_requires_sync(algt->type, algt->mask) |
+	       crypto_requires_nomem(algt->type, algt->mask);
 
 	cipher_name = crypto_attr_alg_name(tb[1]);
 	if (IS_ERR(cipher_name))
@@ -379,7 +380,7 @@  static int create(struct crypto_template
 	} else
 		goto err_free_inst;
 
-	inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
+	inst->alg.base.cra_flags = alg->base.cra_flags & (CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY);
 	inst->alg.base.cra_priority = alg->base.cra_priority;
 	inst->alg.base.cra_blocksize = LRW_BLOCK_SIZE;
 	inst->alg.base.cra_alignmask = alg->base.cra_alignmask |
Index: linux-2.6/crypto/rsa-pkcs1pad.c
===================================================================
--- linux-2.6.orig/crypto/rsa-pkcs1pad.c
+++ linux-2.6/crypto/rsa-pkcs1pad.c
@@ -611,7 +611,8 @@  static int pkcs1pad_create(struct crypto
 	if ((algt->type ^ CRYPTO_ALG_TYPE_AKCIPHER) & algt->mask)
 		return -EINVAL;
 
-	mask = crypto_requires_sync(algt->type, algt->mask);
+	mask = crypto_requires_sync(algt->type, algt->mask) |
+	       crypto_requires_nomem(algt->type, algt->mask);
 
 	inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
 	if (!inst)
@@ -658,7 +659,7 @@  static int pkcs1pad_create(struct crypto
 			goto err_free_inst;
 	}
 
-	inst->alg.base.cra_flags = rsa_alg->base.cra_flags & CRYPTO_ALG_ASYNC;
+	inst->alg.base.cra_flags = rsa_alg->base.cra_flags & (CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY);
 	inst->alg.base.cra_priority = rsa_alg->base.cra_priority;
 	inst->alg.base.cra_ctxsize = sizeof(struct pkcs1pad_ctx);
 
Index: linux-2.6/crypto/xts.c
===================================================================
--- linux-2.6.orig/crypto/xts.c
+++ linux-2.6/crypto/xts.c
@@ -415,7 +415,7 @@  static int create(struct crypto_template
 	} else
 		goto err_free_inst;
 
-	inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
+	inst->alg.base.cra_flags = alg->base.cra_flags & (CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY);
 	inst->alg.base.cra_priority = alg->base.cra_priority;
 	inst->alg.base.cra_blocksize = XTS_BLOCK_SIZE;
 	inst->alg.base.cra_alignmask = alg->base.cra_alignmask |
Index: linux-2.6/include/crypto/algapi.h
===================================================================
--- linux-2.6.orig/include/crypto/algapi.h
+++ linux-2.6/include/crypto/algapi.h
@@ -247,6 +247,15 @@  static inline int crypto_requires_sync(u
 	return crypto_requires_off(type, mask, CRYPTO_ALG_ASYNC);
 }
 
+/*
+ * Returns CRYPTO_ALG_ALLOCATES_MEMORY if type/mask requires the use of sync algorithms.
+ * Otherwise returns zero.
+ */
+static inline int crypto_requires_nomem(u32 type, u32 mask)
+{
+	return crypto_requires_off(type, mask, CRYPTO_ALG_ALLOCATES_MEMORY);
+}
+
 noinline unsigned long __crypto_memneq(const void *a, const void *b, size_t size);
 
 /**
Index: linux-2.6/crypto/adiantum.c
===================================================================
--- linux-2.6.orig/crypto/adiantum.c
+++ linux-2.6/crypto/adiantum.c
@@ -507,7 +507,8 @@  static int adiantum_create(struct crypto
 	if ((algt->type ^ CRYPTO_ALG_TYPE_SKCIPHER) & algt->mask)
 		return -EINVAL;
 
-	mask = crypto_requires_sync(algt->type, algt->mask);
+	mask = crypto_requires_sync(algt->type, algt->mask) |
+	       crypto_requires_nomem(algt->type, algt->mask);
 
 	inst = kzalloc(sizeof(*inst) + sizeof(*ictx), GFP_KERNEL);
 	if (!inst)