linux-kernel - [v2 PATCH] crypto: api - Add __crypto_alloc

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Date:   Thu, 15 Jun 2023 17:00:51 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Dmitry Safonov <dima@...sta.com>
Cc:     linux-kernel@...r.kernel.org, Bob Gilligan <gilligan@...sta.com>,
        David Ahern <dsahern@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Eric Dumazet <edumazet@...gle.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Francesco Ruggeri <fruggeri05@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Salam Noureddine <noureddine@...sta.com>,
        linux-crypto@...r.kernel.org
Subject: [v2 PATCH] crypto: api - Add __crypto_alloc_tfmgfp

On Wed, Jun 14, 2023 at 06:46:42PM +0100, Dmitry Safonov wrote:
> Use it straight away in crypto_clone_cipher(), as that is not meant to
> sleep.
> 
> Signed-off-by: Dmitry Safonov <dima@...sta.com>
> ---
>  crypto/algapi.c   | 2 +-
>  crypto/api.c      | 6 +++---
>  crypto/cipher.c   | 2 +-
>  crypto/internal.h | 2 +-
>  4 files changed, 6 insertions(+), 6 deletions(-)

Good catch.  Though I'd rather add the gfp argument to a separate
function because I'm in the process of replacing ciphers with
something that uses the new crypto_types API.

Once that happens ciphers will switch over to the normal cloning
call and this can be removed.

---8<---
Use it straight away in crypto_clone_cipher(), as that is not meant to
sleep.

Fixes: 51d8d6d0f4be ("crypto: cipher - Add crypto_clone_cipher")
Signed-off-by: Dmitry Safonov <dima@...sta.com>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>

diff --git a/crypto/api.c b/crypto/api.c
index d375e8cd770d..9007b33e1108 100644
--- a/crypto/api.c
+++ b/crypto/api.c
@@ -395,15 +395,15 @@ void crypto_shoot_alg(struct crypto_alg *alg)
 }
 EXPORT_SYMBOL_GPL(crypto_shoot_alg);
 
-struct crypto_tfm *__crypto_alloc_tfm(struct crypto_alg *alg, u32 type,
-				      u32 mask)
+struct crypto_tfm *__crypto_alloc_tfmgfp(struct crypto_alg *alg, u32 type,
+					 u32 mask, gfp_t gfp)
 {
 	struct crypto_tfm *tfm = NULL;
 	unsigned int tfm_size;
 	int err = -ENOMEM;
 
 	tfm_size = sizeof(*tfm) + crypto_ctxsize(alg, type, mask);
-	tfm = kzalloc(tfm_size, GFP_KERNEL);
+	tfm = kzalloc(tfm_size, gfp);
 	if (tfm == NULL)
 		goto out_err;
 
@@ -430,6 +430,13 @@ struct crypto_tfm *__crypto_alloc_tfm(struct crypto_alg *alg, u32 type,
 out:
 	return tfm;
 }
+EXPORT_SYMBOL_GPL(__crypto_alloc_tfmgfp);
+
+struct crypto_tfm *__crypto_alloc_tfm(struct crypto_alg *alg, u32 type,
+				      u32 mask)
+{
+	return __crypto_alloc_tfmgfp(alg, type, mask, GFP_KERNEL);
+}
 EXPORT_SYMBOL_GPL(__crypto_alloc_tfm);
 
 /*
diff --git a/crypto/cipher.c b/crypto/cipher.c
index d39ef5f72ab8..a5a88038f0d6 100644
--- a/crypto/cipher.c
+++ b/crypto/cipher.c
@@ -101,8 +101,8 @@ struct crypto_cipher *crypto_clone_cipher(struct crypto_cipher *cipher)
 	if (alg->cra_init)
 		return ERR_PTR(-ENOSYS);
 
-	ntfm = __crypto_alloc_tfm(alg, CRYPTO_ALG_TYPE_CIPHER,
-				  CRYPTO_ALG_TYPE_MASK);
+	ntfm = __crypto_alloc_tfmgfp(alg, CRYPTO_ALG_TYPE_CIPHER,
+				     CRYPTO_ALG_TYPE_MASK, GFP_ATOMIC);
 	if (IS_ERR(ntfm))
 		return ERR_CAST(ntfm);
 
diff --git a/crypto/internal.h b/crypto/internal.h
index 024c2c795f59..12c50b7e7d87 100644
--- a/crypto/internal.h
+++ b/crypto/internal.h
@@ -118,6 +118,8 @@ void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
 			  struct crypto_alg *nalg);
 void crypto_remove_final(struct list_head *list);
 void crypto_shoot_alg(struct crypto_alg *alg);
+struct crypto_tfm *__crypto_alloc_tfmgfp(struct crypto_alg *alg, u32 type,
+					 u32 mask, gfp_t gfp);
 struct crypto_tfm *__crypto_alloc_tfm(struct crypto_alg *alg, u32 type,
 				      u32 mask);
 void *crypto_create_tfm_node(struct crypto_alg *alg,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt