linux-kernel - [PATCH AUTOSEL 4.18 001/136] crypto: skcipher

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Date:   Mon, 17 Sep 2018 03:00:10 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Stafford Horne <shorne@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Max Filippov <jcmvbkbc@...il.com>,
        Eric Biggers <ebiggers3@...il.com>,
        Nick Desaulniers <nick.desaulniers@...il.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL 4.18 001/136] crypto: skcipher - Fix
 -Wstringop-truncation warnings

From: Stafford Horne <shorne@...il.com>

[ Upstream commit cefd769fd0192c84d638f66da202459ed8ad63ba ]

As of GCC 9.0.0 the build is reporting warnings like:

    crypto/ablkcipher.c: In function ‘crypto_ablkcipher_report’:
    crypto/ablkcipher.c:374:2: warning: ‘strncpy’ specified bound 64 equals destination size [-Wstringop-truncation]
      strncpy(rblkcipher.geniv, alg->cra_ablkcipher.geniv ?: "<default>",
      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
       sizeof(rblkcipher.geniv));
       ~~~~~~~~~~~~~~~~~~~~~~~~~

This means the strnycpy might create a non null terminated string.  Fix this by
explicitly performing '\0' termination.

Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Max Filippov <jcmvbkbc@...il.com>
Cc: Eric Biggers <ebiggers3@...il.com>
Cc: Nick Desaulniers <nick.desaulniers@...il.com>
Signed-off-by: Stafford Horne <shorne@...il.com>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 crypto/ablkcipher.c | 2 ++
 crypto/blkcipher.c  | 1 +
 2 files changed, 3 insertions(+)

diff --git a/crypto/ablkcipher.c b/crypto/ablkcipher.c
index 4ee7c041bb82..8882e90e868e 100644
--- a/crypto/ablkcipher.c
+++ b/crypto/ablkcipher.c
@@ -368,6 +368,7 @@ static int crypto_ablkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
 	strncpy(rblkcipher.type, "ablkcipher", sizeof(rblkcipher.type));
 	strncpy(rblkcipher.geniv, alg->cra_ablkcipher.geniv ?: "<default>",
 		sizeof(rblkcipher.geniv));
+	rblkcipher.geniv[sizeof(rblkcipher.geniv) - 1] = '\0';
 
 	rblkcipher.blocksize = alg->cra_blocksize;
 	rblkcipher.min_keysize = alg->cra_ablkcipher.min_keysize;
@@ -442,6 +443,7 @@ static int crypto_givcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
 	strncpy(rblkcipher.type, "givcipher", sizeof(rblkcipher.type));
 	strncpy(rblkcipher.geniv, alg->cra_ablkcipher.geniv ?: "<built-in>",
 		sizeof(rblkcipher.geniv));
+	rblkcipher.geniv[sizeof(rblkcipher.geniv) - 1] = '\0';
 
 	rblkcipher.blocksize = alg->cra_blocksize;
 	rblkcipher.min_keysize = alg->cra_ablkcipher.min_keysize;
diff --git a/crypto/blkcipher.c b/crypto/blkcipher.c
index 77b5fa293f66..f93abf13b5d4 100644
--- a/crypto/blkcipher.c
+++ b/crypto/blkcipher.c
@@ -510,6 +510,7 @@ static int crypto_blkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
 	strncpy(rblkcipher.type, "blkcipher", sizeof(rblkcipher.type));
 	strncpy(rblkcipher.geniv, alg->cra_blkcipher.geniv ?: "<default>",
 		sizeof(rblkcipher.geniv));
+	rblkcipher.geniv[sizeof(rblkcipher.geniv) - 1] = '\0';
 
 	rblkcipher.blocksize = alg->cra_blocksize;
 	rblkcipher.min_keysize = alg->cra_blkcipher.min_keysize;
-- 
2.17.1