linux-hardening - Re: [PATCH v2] soc: qcom: cmd-db: replace deprecated strncpy with strtomem

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Date: Mon, 18 Mar 2024 16:51:43 -0700
From: Kees Cook <keescook@...omium.org>
To: Justin Stitt <justinstitt@...gle.com>
Cc: Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2] soc: qcom: cmd-db: replace deprecated strncpy with
 strtomem

On Mon, Mar 18, 2024 at 10:49:23PM +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.
> 
> @query is already marked as __nonstring and doesn't need to be
> NUL-terminated. Since @id is a string, we can use the self-describing
> string API strtomem().
> 
> 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>

Nice! A textbook use for strtomem(). :)

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

-- 
Kees Cook