linux-kernel - [PATCH 3.4 108/146] crypto: s390/ghash - Fix incorrect ghash icv buffer handling.

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Message-Id: <1442307861-32031-108-git-send-email-lizf@kernel.org>
Date:	Tue, 15 Sep 2015 17:03:43 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Harald Freudenberger <freude@...ux.vnet.ibm.com>,
	Gerald Schaefer <geraldsc@...ux.vnet.ibm.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 108/146] crypto: s390/ghash - Fix incorrect ghash icv buffer handling.

From: Harald Freudenberger <freude@...ux.vnet.ibm.com>

3.4.109-rc1 review patch.  If anyone has any objections, please let me know.

------------------


commit a1cae34e23b1293eccbcc8ee9b39298039c3952a upstream.

Multitheaded tests showed that the icv buffer in the current ghash
implementation is not handled correctly. A move of this working ghash
buffer value to the descriptor context fixed this. Code is tested and
verified with an multithreaded application via af_alg interface.

Signed-off-by: Harald Freudenberger <freude@...ux.vnet.ibm.com>
Signed-off-by: Gerald Schaefer <geraldsc@...ux.vnet.ibm.com>
Reported-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
[lizf: Backported to 3.4:
 - adjust context
 - drop the change to memcpy()]
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 arch/s390/crypto/ghash_s390.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/arch/s390/crypto/ghash_s390.c b/arch/s390/crypto/ghash_s390.c
index b1bd170..c4a954e 100644
--- a/arch/s390/crypto/ghash_s390.c
+++ b/arch/s390/crypto/ghash_s390.c
@@ -16,11 +16,12 @@
 #define GHASH_DIGEST_SIZE	16
 
 struct ghash_ctx {
-	u8 icv[16];
-	u8 key[16];
+	u8 key[GHASH_BLOCK_SIZE];
 };
 
 struct ghash_desc_ctx {
+	u8 icv[GHASH_BLOCK_SIZE];
+	u8 key[GHASH_BLOCK_SIZE];
 	u8 buffer[GHASH_BLOCK_SIZE];
 	u32 bytes;
 };
@@ -28,8 +29,10 @@ struct ghash_desc_ctx {
 static int ghash_init(struct shash_desc *desc)
 {
 	struct ghash_desc_ctx *dctx = shash_desc_ctx(desc);
+	struct ghash_ctx *ctx = crypto_shash_ctx(desc->tfm);
 
 	memset(dctx, 0, sizeof(*dctx));
+	memcpy(dctx->key, ctx->key, GHASH_BLOCK_SIZE);
 
 	return 0;
 }
@@ -45,7 +48,6 @@ static int ghash_setkey(struct crypto_shash *tfm,
 	}
 
 	memcpy(ctx->key, key, GHASH_BLOCK_SIZE);
-	memset(ctx->icv, 0, GHASH_BLOCK_SIZE);
 
 	return 0;
 }
@@ -54,7 +56,6 @@ static int ghash_update(struct shash_desc *desc,
 			 const u8 *src, unsigned int srclen)
 {
 	struct ghash_desc_ctx *dctx = shash_desc_ctx(desc);
-	struct ghash_ctx *ctx = crypto_shash_ctx(desc->tfm);
 	unsigned int n;
 	u8 *buf = dctx->buffer;
 	int ret;
@@ -70,7 +71,7 @@ static int ghash_update(struct shash_desc *desc,
 		src += n;
 
 		if (!dctx->bytes) {
-			ret = crypt_s390_kimd(KIMD_GHASH, ctx, buf,
+			ret = crypt_s390_kimd(KIMD_GHASH, dctx, buf,
 					      GHASH_BLOCK_SIZE);
 			BUG_ON(ret != GHASH_BLOCK_SIZE);
 		}
@@ -78,7 +79,7 @@ static int ghash_update(struct shash_desc *desc,
 
 	n = srclen & ~(GHASH_BLOCK_SIZE - 1);
 	if (n) {
-		ret = crypt_s390_kimd(KIMD_GHASH, ctx, src, n);
+		ret = crypt_s390_kimd(KIMD_GHASH, dctx, src, n);
 		BUG_ON(ret != n);
 		src += n;
 		srclen -= n;
@@ -92,7 +93,7 @@ static int ghash_update(struct shash_desc *desc,
 	return 0;
 }
 
-static void ghash_flush(struct ghash_ctx *ctx, struct ghash_desc_ctx *dctx)
+static int ghash_flush(struct ghash_desc_ctx *dctx)
 {
 	u8 *buf = dctx->buffer;
 	int ret;
@@ -102,19 +103,18 @@ static void ghash_flush(struct ghash_ctx *ctx, struct ghash_desc_ctx *dctx)
 
 		memset(pos, 0, dctx->bytes);
 
-		ret = crypt_s390_kimd(KIMD_GHASH, ctx, buf, GHASH_BLOCK_SIZE);
+		ret = crypt_s390_kimd(KIMD_GHASH, dctx, buf, GHASH_BLOCK_SIZE);
 		BUG_ON(ret != GHASH_BLOCK_SIZE);
-	}
 
-	dctx->bytes = 0;
+		dctx->bytes = 0;
+	}
 }
 
 static int ghash_final(struct shash_desc *desc, u8 *dst)
 {
 	struct ghash_desc_ctx *dctx = shash_desc_ctx(desc);
-	struct ghash_ctx *ctx = crypto_shash_ctx(desc->tfm);
 
-	ghash_flush(ctx, dctx);
+	ghash_flush(dctx);
 	memcpy(dst, ctx->icv, GHASH_BLOCK_SIZE);
 
 	return 0;
-- 
1.9.1

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