linux-hardening - Re: [PATCH] net/mlx5: simplify mlx5_set_driver

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Message-ID: <202310111433.9BCCADED@keescook>
Date: Wed, 11 Oct 2023 14:34:00 -0700
From: Kees Cook <keescook@...omium.org>
To: Justin Stitt <justinstitt@...gle.com>
Cc: Saeed Mahameed <saeedm@...dia.com>, Leon Romanovsky <leon@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org, linux-rdma@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] net/mlx5: simplify mlx5_set_driver_version string
 assignments

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@...r.kernel.org
> Cc: Kees Cook <keescook@...omium.org>
> Signed-off-by: Justin Stitt <justinstitt@...gle.com>

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

-- 
Kees Cook