linux-hardening - Re: [PATCH] crypto: cavium/nitrox

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Date:   Thu, 14 Sep 2023 20:38:27 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Justin Stitt <justinstitt@...gle.com>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH] crypto: cavium/nitrox - refactor deprecated strncpy

On Wed, Sep 13, 2023 at 12:32:31AM +0000, Justin Stitt wrote:
> `strncpy` is deprecated for use on NUL-terminated destination strings [1].
> 
> We know `hw.partname` is supposed to be NUL-terminated by its later use with seq_printf:
> | nitrox_debugfs.c +25
> |      seq_printf(s, "  Part Name: %s\n", ndev->hw.partname);
> 
> Let's prefer a more robust and less ambiguous string interface.
> 
> A suitable replacement is `strscpy` [2] due to the fact that it guarantees
> NUL-termination on the destination buffer.
> 
> 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>

Looks correct to me.

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

-- 
Kees Cook