linux-kernel - [PATCH 5.4 102/203] crypto: algif_skcipher

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Date:   Fri, 17 Jan 2020 00:16:59 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Herbert Xu <herbert@...dor.apana.org.au>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>
Subject: [PATCH 5.4 102/203] crypto: algif_skcipher - Use chunksize instead of blocksize

From: Herbert Xu <herbert@...dor.apana.org.au>

commit 5b0fe9552336338acb52756daf65dd7a4eeca73f upstream.

When algif_skcipher does a partial operation it always process data
that is a multiple of blocksize.  However, for algorithms such as
CTR this is wrong because even though it can process any number of
bytes overall, the partial block must come at the very end and not
in the middle.

This is exactly what chunksize is meant to describe so this patch
changes blocksize to chunksize.

Fixes: 8ff590903d5f ("crypto: algif_skcipher - User-space...")
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Acked-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 crypto/algif_skcipher.c            |    2 +-
 include/crypto/internal/skcipher.h |   30 ------------------------------
 include/crypto/skcipher.h          |   30 ++++++++++++++++++++++++++++++
 3 files changed, 31 insertions(+), 31 deletions(-)

--- a/crypto/algif_skcipher.c
+++ b/crypto/algif_skcipher.c
@@ -56,7 +56,7 @@ static int _skcipher_recvmsg(struct sock
 	struct alg_sock *pask = alg_sk(psk);
 	struct af_alg_ctx *ctx = ask->private;
 	struct crypto_skcipher *tfm = pask->private;
-	unsigned int bs = crypto_skcipher_blocksize(tfm);
+	unsigned int bs = crypto_skcipher_chunksize(tfm);
 	struct af_alg_async_req *areq;
 	int err = 0;
 	size_t len = 0;
--- a/include/crypto/internal/skcipher.h
+++ b/include/crypto/internal/skcipher.h
@@ -205,19 +205,6 @@ static inline unsigned int crypto_skciph
 	return alg->max_keysize;
 }
 
-static inline unsigned int crypto_skcipher_alg_chunksize(
-	struct skcipher_alg *alg)
-{
-	if ((alg->base.cra_flags & CRYPTO_ALG_TYPE_MASK) ==
-	    CRYPTO_ALG_TYPE_BLKCIPHER)
-		return alg->base.cra_blocksize;
-
-	if (alg->base.cra_ablkcipher.encrypt)
-		return alg->base.cra_blocksize;
-
-	return alg->chunksize;
-}
-
 static inline unsigned int crypto_skcipher_alg_walksize(
 	struct skcipher_alg *alg)
 {
@@ -232,23 +219,6 @@ static inline unsigned int crypto_skciph
 }
 
 /**
- * crypto_skcipher_chunksize() - obtain chunk size
- * @tfm: cipher handle
- *
- * The block size is set to one for ciphers such as CTR.  However,
- * you still need to provide incremental updates in multiples of
- * the underlying block size as the IV does not have sub-block
- * granularity.  This is known in this API as the chunk size.
- *
- * Return: chunk size in bytes
- */
-static inline unsigned int crypto_skcipher_chunksize(
-	struct crypto_skcipher *tfm)
-{
-	return crypto_skcipher_alg_chunksize(crypto_skcipher_alg(tfm));
-}
-
-/**
  * crypto_skcipher_walksize() - obtain walk size
  * @tfm: cipher handle
  *
--- a/include/crypto/skcipher.h
+++ b/include/crypto/skcipher.h
@@ -304,6 +304,36 @@ static inline unsigned int crypto_skciph
 	return crypto_tfm_alg_blocksize(crypto_skcipher_tfm(tfm));
 }
 
+static inline unsigned int crypto_skcipher_alg_chunksize(
+	struct skcipher_alg *alg)
+{
+	if ((alg->base.cra_flags & CRYPTO_ALG_TYPE_MASK) ==
+	    CRYPTO_ALG_TYPE_BLKCIPHER)
+		return alg->base.cra_blocksize;
+
+	if (alg->base.cra_ablkcipher.encrypt)
+		return alg->base.cra_blocksize;
+
+	return alg->chunksize;
+}
+
+/**
+ * crypto_skcipher_chunksize() - obtain chunk size
+ * @tfm: cipher handle
+ *
+ * The block size is set to one for ciphers such as CTR.  However,
+ * you still need to provide incremental updates in multiples of
+ * the underlying block size as the IV does not have sub-block
+ * granularity.  This is known in this API as the chunk size.
+ *
+ * Return: chunk size in bytes
+ */
+static inline unsigned int crypto_skcipher_chunksize(
+	struct crypto_skcipher *tfm)
+{
+	return crypto_skcipher_alg_chunksize(crypto_skcipher_alg(tfm));
+}
+
 static inline unsigned int crypto_sync_skcipher_blocksize(
 	struct crypto_sync_skcipher *tfm)
 {