linux-kernel - [PATCH 3.16 085/306] crypto: gcm - Fix IV buffer size in crypto_gcm

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Message-ID: <lsq.1487198500.34579483@decadent.org.uk>
Date:   Wed, 15 Feb 2017 22:41:40 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Ondrej Mosnáček" <omosnacek@...il.com>,
        "Herbert Xu" <herbert@...dor.apana.org.au>
Subject: [PATCH 3.16 085/306] crypto: gcm - Fix IV buffer size in
 crypto_gcm_setkey

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

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

From: Ondrej Mosnáček <omosnacek@...il.com>

commit 50d2e6dc1f83db0563c7d6603967bf9585ce934b upstream.

The cipher block size for GCM is 16 bytes, and thus the CTR transform
used in crypto_gcm_setkey() will also expect a 16-byte IV. However,
the code currently reserves only 8 bytes for the IV, causing
an out-of-bounds access in the CTR transform. This patch fixes
the issue by setting the size of the IV buffer to 16 bytes.

Fixes: 84c911523020 ("[CRYPTO] gcm: Add support for async ciphers")
Signed-off-by: Ondrej Mosnacek <omosnacek@...il.com>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 crypto/gcm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/crypto/gcm.c
+++ b/crypto/gcm.c
@@ -109,7 +109,7 @@ static int crypto_gcm_setkey(struct cryp
 	struct crypto_ablkcipher *ctr = ctx->ctr;
 	struct {
 		be128 hash;
-		u8 iv[8];
+		u8 iv[16];
 
 		struct crypto_gcm_setkey_result result;