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Date:   Wed, 11 Oct 2023 14:34:00 -0700
From:   Kees Cook <keescook@chromium.org>
To:     Justin Stitt <justinstitt@google.com>
Cc:     Saeed Mahameed <saeedm@nvidia.com>,
        Leon Romanovsky <leon@kernel.org>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>, netdev@vger.kernel.org,
        linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-hardening@vger.kernel.org
Subject: Re: [PATCH] net/mlx5: simplify mlx5_set_driver_version string
 assignments
Message-ID: <202310111433.9BCCADED@keescook>
References: <20231011-strncpy-drivers-net-ethernet-mellanox-mlx5-core-main-c-v1-1-90fa39998bb2@google.com>
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In-Reply-To: <20231011-strncpy-drivers-net-ethernet-mellanox-mlx5-core-main-c-v1-1-90fa39998bb2@google.com>
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On Wed, Oct 11, 2023 at 09:29:57PM +0000, Justin Stitt wrote:
> In total, just assigning this version string takes:
> (1) strncpy()'s
> (5) strlen()'s
> (3) strncat()'s
> (1) snprintf()'s
> (4) max_t()'s
> 
> Moreover, `strncpy` is deprecated [1] and `strncat` really shouldn't be
> used either [2]. With this in mind, let's simply use a single
> `snprintf`.

Yes, please! readability++

> 
> Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1]
> Link: https://elixir.bootlin.com/linux/v6.6-rc5/source/include/linux/fortify-string.h#L448 [2]
> Link: https://github.com/KSPP/linux/issues/90
> Cc: linux-hardening@vger.kernel.org
> Cc: Kees Cook <keescook@chromium.org>
> Signed-off-by: Justin Stitt <justinstitt@google.com>

Reviewed-by: Kees Cook <keescook@chromium.org>

-- 
Kees Cook