linux-hardening - Re: [PATCH] ALSA: hda/tegra: refactor deprecated strncpy

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Date:   Tue, 08 Aug 2023 14:46:26 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Justin Stitt <justinstitt@...gle.com>
Cc:     Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        alsa-devel@...a-project.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.org>,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH] ALSA: hda/tegra: refactor deprecated strncpy

On Mon, 07 Aug 2023 19:49:28 +0200,
Justin Stitt wrote:
> 
> `strncpy` is deprecated for use on NUL-terminated destination strings [1].
> 
> A suitable replacement is `strscpy` [2] due to the fact that it
> guarantees NUL-termination on its destination buffer argument which is
> _not_ the case for `strncpy`!
> 
> It should be noted that the current implementation is unlikely to have a
> bug because `drv_name` is a string literal with a size of 9 while
> `card->driver` has a size of 16. However, it is probably worthwhile to
> switch to a more robust and less ambiguous interface.
> 
> [1]: www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings
> [2]: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html
> 
> Link: https://github.com/KSPP/linux/issues/90
> Cc: linux-hardening@...r.kernel.org
> Signed-off-by: Justin Stitt <justinstitt@...gle.com>

Thanks, applied.


Takashi