linux-kernel - Re: [PATCH] ionic: replace deprecated strncpy with strscpy

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Message-ID: <202310111629.4CE6D1A72@keescook>
Date:   Wed, 11 Oct 2023 16:30:27 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Justin Stitt <justinstitt@...gle.com>
Cc:     Shannon Nelson <shannon.nelson@....com>,
        Brett Creeley <brett.creeley@....com>, drivers@...sando.io,
        "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-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] ionic: replace deprecated strncpy with strscpy

On Wed, Oct 11, 2023 at 09:53:44PM +0000, Justin Stitt wrote:
> strncpy() is deprecated for use on NUL-terminated destination strings
> [1] and as such we should prefer more robust and less ambiguous string
> interfaces.
> 
> NUL-padding is not needed due to `ident` being memset'd to 0 just before
> the copy.
> 
> Considering the above, a suitable replacement is `strscpy` [2] due to
> the fact that it guarantees NUL-termination on the destination buffer
> without unnecessarily NUL-padding.
> 
> Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1]
> Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2]
> Link: https://github.com/KSPP/linux/issues/90
> Cc: linux-hardening@...r.kernel.org
> Signed-off-by: Justin Stitt <justinstitt@...gle.com>

Yup, looks like a direct replacement.

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

-- 
Kees Cook