linux-kernel - [PATCH 4.18 001/228] crypto: skcipher - Fix -Wstringop-truncation warnings

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Message-Id: <20181002132459.134160656@linuxfoundation.org>
Date:   Tue,  2 Oct 2018 06:21:38 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        Max Filippov <jcmvbkbc@...il.com>,
        Eric Biggers <ebiggers3@...il.com>,
        Nick Desaulniers <nick.desaulniers@...il.com>,
        Stafford Horne <shorne@...il.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.18 001/228] crypto: skcipher - Fix -Wstringop-truncation warnings

4.18-stable review patch.  If anyone has any objections, please let me know.

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

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 crypto/ablkcipher.c |    2 ++
 crypto/blkcipher.c  |    1 +
 2 files changed, 3 insertions(+)

--- a/crypto/ablkcipher.c
+++ b/crypto/ablkcipher.c
@@ -368,6 +368,7 @@ static int crypto_ablkcipher_report(stru
 	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(struc
 	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;
--- a/crypto/blkcipher.c
+++ b/crypto/blkcipher.c
@@ -510,6 +510,7 @@ static int crypto_blkcipher_report(struc
 	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;