linux-hardening - Re: [PATCH] ath5k: replace deprecated strncpy with strscpy

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Message-ID: <5b4df38c-c16c-4571-96c3-4bf205543849@kernel.org>
Date: Mon, 16 Oct 2023 07:59:22 +0200
From: Jiri Slaby <jirislaby@...nel.org>
To: Justin Stitt <justinstitt@...gle.com>,
 Nick Kossifidis <mickflemm@...il.com>, Luis Chamberlain <mcgrof@...nel.org>,
 Kalle Valo <kvalo@...nel.org>
Cc: linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-hardening@...r.kernel.org
Subject: Re: [PATCH] ath5k: replace deprecated strncpy with strscpy

On 13. 10. 23, 22:53, 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.
> 
> We expect led->name to be NUL-terminated based on the presence of a
> manual NUL-byte assignment.
> 
> This NUL-byte assignment was added in Commit daf9669bea30aa22 ("ath5k:
> ensure led name is null terminated"). If strscpy() had existed and had
> been used back when this code was written then potential bugs and the
> need to manually NUL-terminate could have been avoided. Since we now
> have the technology, let's use it :)
> 
> 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. If NUL-padding is required let's opt
> for strscpy_pad().
> 
> 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>

LGTM
Reviewed-by: Jiri Slaby <jirislaby@...nel.org>


-- 
js
suse labs