linux-kernel - Re: [PATCH v2 1/2] crypto: Fix -Wstringop-truncation warnings

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Message-ID: <20180708164344.3lpe6q7m2yjeqcdl@gondor.apana.org.au>
Date:   Mon, 9 Jul 2018 00:43:44 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Stafford Horne <shorne@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Greg KH <gregkh@...uxfoundation.org>, arnd@...db.de,
        Eric Biggers <ebiggers3@...il.com>,
        linux-crypto@...r.kernel.org, Max Filippov <jcmvbkbc@...il.com>,
        Nick Desaulniers <nick.desaulniers@...il.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH v2 1/2] crypto: Fix -Wstringop-truncation warnings

On Mon, Jun 25, 2018 at 09:45:37PM +0900, Stafford Horne wrote:
> 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>

Patch applied.  Thanks.
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
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